MOBILE OPERATING UNIT, ELEVATOR AND METHOD
FIELD OF THE INVENTION
[0001] The invention relates to manual control of movement of an elevator
car, wherein the elevator preferably is an elevator for vertically transporting
passengers and/or goods.
BACKGROUND OF THE INVENTION
[0002] Modern elevators typically have a normal operation mode and a
service operation mode. In the normal operation mode, movement of the car
between vertically displaced landings in response to calls received from
passengers elevator is automatically controllable by the control system. In the
service operation mode, movement of the car is manually controllable by a
user with an operating unit located inside the hoistway. The operating unit is
not available to use for passengers of the elevator. Typically the operating unit
is located on top of the car roof or in the pit of the hoistway.
[0003] The operating unit has buttons, also referred to as manual drive
buttons, which are manually operable by a user to control movement of an
elevator car. With these drive buttons manual service drive is possible with
low speed (for example 0.3 m/s). Car starts to move when drive buttons are
pushed and stops when buttons are released. To enable manual drive,
selection switch in the inspection station must first be turned into service
mode position. It must be returned back to original position before normal
elevator operation is possible.
[0004] Traditionally, said operating unit has been fixed to its position in a
non-movable manner. This may cause practical problems and be nonergonomic
for the service personnel. Therefore an operating unit that is
mobile has been introduced. Said mobility can be facilitated by non-fixed
mounting of the operating unit. The power and signal connection between the
operating unit and the elevator controls system can be provided by aid of a
flexible cable. It has been noted that the mobility may cause new safety risks,

since misplacing of the unit after usage can lead to various hazards. These can
be for instance, leaving the unit under overspeed governor tension weight,
which may render the overspeed governor inoperable due to rope stretch, or
leaving the unit in such a place that it is damaged by a moving elevator car or
counterweight, or leaving the unit lying on the pit such that it can cause
tripping.
BRIEF DESCRIPTION OF THE INVENTION
[0005] The object of the invention is to provide a mobile operating unit, an
elevator, and a method, which are improved in terms of safety related to
placing of a mobile operating unit after usage thereof. An object is particularly
to alleviate one or more of the above defined drawbacks of prior art and/or
problems discussed or implied elsewhere in the description. An object is to
achieve this with simple structure, with small amount of components and with
high reliability.
[0006] Embodiments are presented, inter alia, which provide a high level
of mobility in use, as well as good suitability for different elevator layouts.
Embodiments are presented, inter alia, which can be placed after use in a
predetermined safe location structurally simply and economically.
Embodiments are presented, inter alia, which can serve safely also if a separate
station for the mobile operating unit is not in use or available.
[0007] It is brought forward a new mobile operating unit for an elevator,
comprising an operating interface manually operable by a user to control
movement of an elevator car; and an orientation sensor for sensing orientation
of the operating unit. With this solution, one or more of the above mentioned
advantages and/or objectives are achieved.
[0008] One advantage is that the mobile operating unit can provide
information indicating the orientation of the mobile operating unit, such as to
an elevator control system. The orientation of the mobile operating unit is
usable as indication whether the mobile operating unit is after usage thereof
left lying around or whether it is placed in a predetermined orientation. This
increases safety since the elevator control system can be configured allow or
prevent elevator functions based on orientation of the operating unit. Such
functions to be prevented or allowed can include normal elevator operation,
for instance.
[0009] Preferable further features are introduced in the following, which
further features can be combined with the mobile operating unit individually
or in any combination.
[0010] In a preferred embodiment, the mobile operating unit is provided
for being connected to an elevator control system. Preferably, the mobile
operating unit comprises an output for outputting signals, in particular via a
wired or wireless connection, from the mobile operating unit to an elevator
control system. Such signals can include manual operation signals, such as
signals for the elevator control to move of the elevator car upwards or
downwards and/or signals from the orientation sensor.
[0011] In a preferred embodiment, the mobile operating unit comprises a
power input.
[0012] In a preferred embodiment, the operating unit is elongated in
shape.
[0013] In a preferred embodiment, the operating unit comprises a nonplanar
side face comprising a tip for making the operating unit unstable when
standing on its non-planar side face.
[0014] In a preferred embodiment, a flexible cable for transmitting power
to and/or signal(s) from the mobile operating unit is connected to the mobile
operating unit. It can protrude from mobile operating unit, preferably from
one end of the operating unit when it is elongated in shape, for instance.
[0015] In a preferred embodiment, the operating unit is tiltable around
one or more horizontal axes pointing in different directions.

[0016] In a preferred embodiment, the state of the orientation sensor is
changeable between a first state and a second state by tilting the operating unit
around one or more horizontal axes, most preferably around anyone of at least
two horizontal axes pointing in different directions, such as in orthogonal
directions.
[0017] In a preferred embodiment, the orientation sensor has a first state
when the operating unit is in a first attitude and a second state when the
operating unit is in a second attitude.
[0018] Preferably, when the operating unit is in the first attitude, an axis
of the operating unit, which is preferably a longitudinal axis thereof, points in
a first direction, and when the operating unit is in the second attitude said axis
of the operating unit points in a second direction.
[0019] In a preferred embodiment, the operating unit is elongated in
shape, and said first attitude is an upright attitude, and said second attitude is
a tilted attitude. More specifically, when the operating unit is in the upright
attitude, the longitudinal axis of the operating unit points in a first direction,
the first direction being vertical or at least substantially vertical direction, and
when the operating unit is in the tilted attitude the longitudinal axis of the
operating unit points in a second direction, the second direction being a
direction angularly displaced from said first direction, such as horizontal or at
least substantially horizontal direction.
[0020] In a preferred embodiment, the first state is an electrically
conducting state and the second state is electrically non-conducting state, or
vice versa.
[0021] In a preferred embodiment, the orientation sensor comprises a
movable electrically conductive contact, such as a solid contact member or
fluid contact substance for example, which is arranged to be pulled by gravity
to close a circuit, such as to move to electrically connect two conductors, when
the operating unit is in the first attitude, and to be pulled by gravity to break

the circuit, such as to move to electrically disconnect said two conductors,
when the operating unit is in the second attitude, or vice versa. Preferably,
the contact is in a closed space where it can move into and out of simultaneous
contact with two conductors. Preferably, said solid contact member is a ball,
such as a metal ball for example, which is advantageous since such a member
can be rolled by gravity to break and to close a circuit. Alternatively, said
contact is fluid contact substance, which is advantageous since such a
substance can flow moved by gravity to break and to close a circuit.
[0022] In an embodiment, the orientation sensor may be an acceleration
sensor, a gyroscope and / or a corresponding MEMS orientation sensor.
Signal(s) indicating orientation sensor state may be sent from the operating
unit to the elevator control via one more buses. Optionally, the operating unit
may comprise a relay as well as a processor, a comparator or corresponding
evaluation circuit. The evaluation circuit may be configured to compare state
of the orientation sensor to a predetermined orientation criteria, and to
control the relay on the basis of the comparison. Relay output may be wired
from the operating unit to the elevator control, to communicate attitude of the
operating unit to the elevator control.
[0023] In a preferred embodiment, the orientation sensor is or at least
comprises a mercury switch.
[0024] In a preferred embodiment, the mobile operating unit comprises at
least a first button for being pressed by a user to signal the elevator control to
move of the elevator car upwards, and a second button for being pushed by a
user to signal the elevator control to move of the elevator car downwards.
[0025] In a preferred embodiment, the mobile operating unit is equipped
with a holder for holding the mobile operating unit in the aforementioned first
attitude. Preferably, the mobile operating unit can be temporarily parked on
the holder when not in use, and the mobile operating unit can be removed from
the holder when the mobile operating unit operating unit is taken into use.

Preferably, the holder comprises a pocket for receiving the mobile operating
unit, the pocket being preferably provided with by plurality stop faces blocking
lateral and downwards directed vertical movement of the operating unit
inserted into the pocket, such as walls and a bottom.
[0026] It is also brought forward a new elevator comprising an elevator
car and a mobile operating unit as described anywhere above or in anyone of
the claims. The elevator is configured to prevent normal elevator operation if
orientation of the operating unit sensed by aid of the orientation sensor does
not fulfil one or more predefined criteria. With this solution, one or more of
the above mentioned advantages and/or objectives are achieved.
[0027] One advantage is that elevator safety is improved, because
normal elevator is not started after usage of the mobile operating unit in a case
where the mobile operating unit is oriented such that it is likely left lying
around.
[0028] Preferable further features have been introduced above as well as
in the following, which further features can be combined with the elevator
individually or in any combination.
[0029] In a preferred embodiment, the elevator comprises a control
system for controlling movement of the elevator car.
[0030] In a preferred embodiment, in the normal elevator operation the
elevator serves passengers.
[0031] In a preferred embodiment, in the normal elevator operation,
movement of the car between vertically displaced landings, preferably in
response to calls received from passengers, is automatically controllable by
the control system.
[0032] In a preferred embodiment, the elevator is operable by normal
elevator operation and by service operation.

[0033] In a preferred embodiment, in the service operation movement of
the car is manually controllable by a user with the operating unit.
[0034] In a preferred embodiment, said mobile operating unit is connected
with the control system, preferably via one more buses, for transmitting
signal(s) from the operating interface and/or from the orientation sensor.
[0035] In a preferred embodiment, the elevator comprises a holder for
holding the operating unit such oriented, in particular in such an attitude, that
the one or more predefined criteria are fulfilled.
[0036] In a preferred embodiment, the elevator is configured to move the
car upwards in response to press of the first button by the user, and
downwards in response to press of the second button by the user, and to stop
each said movement when the press of the button in question stops.
[0037] In a preferred embodiment, the elevator control system is
configured to control movement of the car in response to signal(s) received
from the operating unit, such as by rotating a motor for rotating a drive sheave
around which passes a roping connected with the car, for example.
[0038] In a preferred embodiment, the operating unit is elongated in
shape, and said one or more predefined criteria include at least that the
operating unit is in upright position, i.e. where the longitudinal axis thereof
points in vertical or at least substantially vertical direction.
[0039] In a preferred embodiment, the operating unit is disposed inside an
elevator hoistway, separately from the car. Preferably then, the operating unit
is disposed in the pit of the hoistway.
[0040] In a preferred embodiment, the operating unit is carried by the car,
such as on top the roof of the elevator car.
[0041] It is also brought forward a new method for monitoring elevator,
which elevator comprises an operating unit manually operable by a user to

control movement of an elevator car, which operating unit is as described
anywhere above or in anyone of the claims. The method comprises sensing
orientation of the operating unit, and if the orientation does not fulfil one or
more predefined criteria, preventing normal elevator operation.
[0042] With this solution, one or more of the above mentioned advantages
and/or objectives are achieved.
[0043] One advantage is that elevator safety is improved, because normal
elevator is not started after usage of the mobile operating unit is a case where
the mobile operating unit is oriented such that it is likely left lying around.
[0044] Preferable further features have been introduced above as well as
in the following, which further features can be combined with the method
individually or in any combination.
[0045] In a preferred embodiment, the elevator is as described anywhere
above or in anyone of the claims.
[0046] In a preferred embodiment, said sensing orientation of the
operating unit is performed by aid of the orientation sensor.
[0047] In a preferred embodiment, the method comprises determining
whether the orientation fulfils one or more predefined criteria.
[0048] In a preferred embodiment, if the orientation fulfils at least said one
or more predefined criteria, and possibly also if one or more other predefined
criteria are fulfilled, the method comprises allowing normal elevator
operation.
[0049] In a preferred embodiment, the elevator mentioned anywhere
above has a normal operation mode, in particular wherein the elevator is
operable by normal elevator operation, and a service operation mode, in
particular wherein the elevator is operable by service operation.

[0050] The elevator is preferably such that it comprises an elevator car
vertically movable between two or more vertically displaced landings during
said normal operation. During said service operation, the car can preferably be
driven by the manual control to any location between the uppermost and
lowermost landing and stopped there, i.e. also to a location where the sill of
the car is not level with a sill of a landing. Preferably, the car has an interior
space suitable for receiving a passenger or passengers, and the car can be
provided with a door for forming a closed interior space, such as an automatic
door.
[0051] In general, shape of the operating unit may be selected such that
when laid down, the operating unit tends to orientate into or towards a certain
attitude. The one or more predefined criteria are then preferably selected such
that they are not fulfilled when the operating unit is in said certain attitude.
The elongated shape is one such shape, since it tends to tilt easily into a
horizontal attitude when placed to stand. At least one side of the operating
unit could be rounded, for example half-round, which makes the operating unit
tend to tilt easily when placed to stand on the rounded side. In one alternative,
the operating unit could be a hemisphere, for instance. In one alternative, the
operating unit could have a flat side, .
BRIEF DESCRIPTION OF THE DRAWINGS
[0052] In the following, the present invention will be described in more
detail by way of example and with reference to the attached drawings, in which
Figure 1 illustrates a mobile operating unit for an elevator according to an
embodiment in an upright attitude.
Figure 2 illustrates the mobile operating unit of Figure 1 in a tilted attitude.
Figure 3 illustrates a preferred cross section of the mobile operating unit of
Figure 1 at the point of the orientation sensor.
Figure 4 illustrates a mobile operating unit for an elevator according to an
embodiment in a holder holding it in an upright attitude.

Figure 5 illustrates a preferred cross section of the mobile operating unit and
the holder of Figure 4.
Figure 6 illustrates a preferred connection between the mobile operating unit
and an elevator control system.
Figure 7 illustrates a preferred embodiment of an elevator.
Figure 8 illustrates preferred further details of the orientation sensor in a
situation where the orientation sensor is in upright attitude.
Figure 9 illustrates preferred further details of the orientation sensor in a
situation where the orientation sensor is in tilted attitude.
Figures 10 and 11 illustrate alternative ways to position the mobile operating
unit such that it is in upright position.
The foregoing aspects, features and advantages of the invention will be
apparent from the drawings and the detailed description related thereto.
DETAILED DESCRIPTION
[0053] Figure 1 illustrates a mobile operating unit 1 for an elevator
according to an embodiment. The mobile operating unit 1 (later also referred
to as an operating unit 1) comprises an operating interface 2 manually
operable by a user to control movement of an elevator car; and an orientation
sensor 3 for sensing orientation of the operating unit 1.
[0054] Presence of an orientation sensor 3 facilitates that an elevator
control system 10 can obtain information indicating the orientation of the
mobile operating unit 1 is. The orientation of the mobile operating unit 1 is
usable as indication whether the mobile operating unit 1 is left lying around or
whether it is placed in a predetermined orientation. This increases safety
since, the elevator control system 10 can be configured allow or prevent
elevator functions based on orientation of the operating unit. Such functions
to be prevented or allowed can include normal elevator operation, for
instance.

[0055] In the embodiment of Figure 1, the operating unit 1 is elongated
in shape, which is preferable since this with kind of shape the orientation is
most meaningful and relevant for safety. Since it is unlikely to place a mobile
operating unit 1 of this kind unintentionally to stand in an upright attitude,
orientation thereof can be used as an indicator of safety of its positioning.
Positioning of an elongated operating unit 1 in an upright position requires an
amount of concentration telling the elevator system 10 that it has not been
forgotten by the service person lying around.
[0056] The operating unit 1 can have a non-planar side face r
comprising a tip t for making the operating unit 1 unstable when standing on
its non-planar side face r. The operating unit 1 is hereby arranged to tilt, when
placed to stand its non-planar face r against a planar horizontal face, such as a
floor face. The non-planar shape is optional and illustrated with broken line in
Figure 1. The non-planar side face r is preferably rounded. The increased
instability of the operating unit 1 increases the need of the service person to
concentrate such that he is likely to position the operating unit 1 in a holder or
other safe position in correct attitude.
[0057] The orientation sensor 3 preferably changes state according to
its orientation, and thereby according to the orientation of the operating unit
1 comprising it. Preferably, particularly, the orientation sensor 3 has a first
state when the operating unit 1 is in a first attitude and a second state when
the operating unit 1 is in a second attitude. In the preferred embodiments, said
first attitude is an upright attitude and a second attitude is a tilted attitude.
Preferably, the state of the orientation sensor is changeable between a first
state and a second state by tilting the operating unit 1 around a horizontal axis
x1,x2 from an upright attitude to a tilted attitude. More particularly, it is
preferable that the state of the orientation sensor is changeable between the
first state and the second state by tilting the operating unit 1 around anyone
of at least two horizontal axes x1,x2. Since there can be differently oriented
horizontal axes, it is preferable that tilting around anyone of them, can cause

change of state of the of the orientation sensor 3. Thus, no unsafe state can
follow tilting regardless of where on a horizontal plane the axis in question
points. In the preferred embodiment illustrated, the at least around two
horizontal axes x1,x2 point on a horizontal plane in different directions, in this
case in orthogonal directions.
[0058] Figure 1 illustrates the operating unit 1 in the first attitude,
which is in this case an upright attitude, wherein the longitudinal axis x3
thereof points in vertical direction. Figure 2 illustrates the operating unit 1 is
in a second attitude, which is in this case a tilted attitude, wherein the
longitudinal axis x3 thereof points in direction angularly displaced from
vertical direction. In figure 2, the operating unit 1 has been tilted around the
horizontal axis x2 such that the longitudinal axis x3 thereof points in
horizontal direction.
[0059] The mobile operating unit 1 is moreover such that it comprises
a first button 2a for being pressed by a user to signal the elevator control to
move of the elevator car upwards, and a second button 2b for being pushed by
a user to signal the elevator control to move of the elevator car downwards.
[0060] The mobile operating unit 1 is moreover such that it comprises
a selection switch 2c for selecting between normal operation mode and service
operation mode. In Figure 1, the selection switch 2c is a rotatable switch.
[0061] As illustrated in Figure 4, the mobile operating unit 1 can be
equipped with a holder 4 for holding the mobile operating unit 1 in the first
attitude, i.e. in the aforementioned upright attitude in the embodiment
according to the preferred examples.
[0062] The holder 4 is such that the mobile operating unit 1 can be
temporarily parked on it when not in use, and such that the mobile operating
unit 1 can be removed from the holder 4 when the mobile operating unit 1 is
taken into use. In the preferred embodiment illustrated, the holder 4
comprises a pocket 4a for receiving the mobile operating unit 1. In Figure 4,

the mobile operating unit 1 has been inserted in said pocket 4a. The holder 4
can be mounted immovably in the hoistway, such as on top the roof of the
elevator car 5, or on a fixed structure in the pit of the hoistway 7.
[0063] The mobile operating unit 1 is provided for being connected to
an elevator control system 10. Figure 6 illustrates such a connection.
Generally, said connection can be wired or wireless. Over the connection,
preferably signals can be transmitted from the operating unit 1 to the elevator
control system 10. Such signals can include manual operation signals, such as
signals for the elevator control to move of the elevator car upwards or
downwards, and/or signals from the orientation sensor 3. For the purpose of
facilitating said connection, the mobile operating unit 1 comprises an output
for outputting signals from the mobile operating unit 1 to an elevator control
system 10. The mobile operating unit 1 moreover comprises an input for
inputting power thereto, in particular electricity. In the embodiment of Figure
1, a flexible cable 6 for transmitting power to and signal(s) from the mobile
operating unit 1 is connected to the mobile operating unit 1. The cable 6 can
comprise separate wires for power supply and for signal transmission, the
power supply wire being connected to the aforementioned input, and the wire
for signal transmission to the aforementioned output. Alternatively, signal
transmission may be implemented by means of carrier wave via the power
supply wire.
[0064] Figure 7 illustrates an elevator comprising an elevator car 5,
vertically movable in an elevator hoistway 7, and a mobile operating unit 1 as
described referring to Figures 1-6. The elevator is configured to prevent
normal elevator operation if orientation of the operating unit 1 sensed by aid
of the orientation sensor 3 does not fulfil one or more predefined criteria.
[0065] The elevator comprises a control system 10 for controlling
movement of the elevator car 5. The elevator is operable by normal elevator
operation and by service operation. In the normal elevator operation
movement of the car 5 between vertically displaced landings L1,L2 in response

to calls received from passengers elevator is automatically controllable by the
control system 10. In the service operation movement of the car 5 is manually
controllable by a user with the operating unit 1.
[0066] Said mobile operating unit 1 is connected with the control
system 10 via one more buses for transmitting signal(s) from the operating
interface 2 and/or from the orientation sensor 3.
[0067] In Figure 7, it is illustrated two alternative preferred positions
for the mobile operating unit 1. The elevator could have a mobile operating
unit 1 in either or both of these positions, or possibly elsewhere inside or in
proximity of the hoistway 7.
[0068] In the embodiment of Figure 7, the elevator has an operating unit
1 is disposed inside the elevator hoistway 7, separately from the car 5. Thus, it
does not travel with the car 5, and it is operable by a person not being onboard
the car 5. The operating unit 1 in question is particularly disposed in the pit of
the hoistway 7.
[0069] In the embodiment of Figure 7, the elevator has an operating unit
1 carried by the car 5. Thus, it travels with the car 5, and it is operable by a
person standing onboard the car 5.
[0070] In Figure 7, the elevator comprises a holder 4 for holding each
said mobile operating unit 1 such oriented, i.e. in such an attitude, that the one
or more predefined criteria are fulfilled. In Figure 7, said attitude is upright
attitude mentioned and illustrated referring to Figures 1-5. The elevator
comprises a holder 4 mounted in the hoistway, on top the roof of the elevator
car 5 holding the operating unit 1 carried by the car 5 such oriented, i.e. in
such an attitude, that the one or more predefined criteria are fulfilled. The
elevator comprises a holder 4 mounted immovably in the hoistway, on a fixed
structure in the pit of the hoistway 7 holding the operating unit 1 carried by
the car 5 such oriented, i.e. in such an attitude, that the one or more predefined
criteria are fulfilled.

[0071] The elevator is configured to move the car 5 upwards in
response to press of the first button 2a of the mobile operating unit 1 by a user,
and downwards in response to press of the second button 2b mobile operating
unit 1by a user, and to stop each said movement when the pressing of the
button 2a,2b in question stops.
[0072] The elevator control system 10 is configured to control
movement of the car 5 in response signal(s) received from the operating unit
1 by controlling rotation of a motor 11 for rotating a drive sheave 12 around
which passes a roping 13 connected to the car 5.
[0073] The mobile operating unit 1 is preferably elongated in shape,
and said one or more predefined criteria include at least that the operating
unit 1 is in upright position, i.e. where the longitudinal axis x3 thereof points
in vertical or at least substantially vertical direction. With said at least
substantially vertical direction it is meant direction less than 10 degrees
angularly displaced from vertical direction.
[0074] In a method for monitoring elevator, according to an
embodiment, the elevator comprises a mobile operating unit 1 manually
operable by a user to control movement of an elevator car 5, which operating
unit as described referring to Figures 1-6, the elevator being as described
referring to Figure 7.
[0075] The method comprises sensing orientation of the mobile
operating unit 1, and if the orientation does not fulfil the one or more
predefined criteria, preventing normal elevator operation.
[0076] The sensing is performed by aid of the orientation sensor 3
comprised in the mobile operating unit 1.
[0077] The method moreover comprises determining whether the
orientation fulfils one or more predefined criteria.

[0078] If the orientation fulfils at least said one or more predefined
criteria, and possibly also if one or more other predefined criteria are fulfilled,
the method comprises allowing normal elevator operation.
[0079] Figures 8 and 9 illustrate preferred further details of the
orientation sensor 3. In this embodiment, the first state of the orientation
sensor 3 is illustrated in Figure 8, where the first state is an electrically
conducting state and the second state is illustrated in Figure 8, where the
second state is electrically non-conducting state.
[0080] In the preferred embodiment, the orientation sensor 3 has the
first state when the operating unit 1 is in a first attitude namely preferably in
an upright attitude and the second state when the operating unit 1 is in a
second attitude namely preferably a tilted attitude.
[0081] The orientation sensor 3 comprises a movable electrically
conductive contact 30. The contact 30 is in the illustrated embodiment a solid
member, more particularly a ball comprising metal, but it could alternatively
be a fluid contact substance. The contact 30 is arranged to be pulled by gravity
to close a circuit, in particular to move to electrically connect two conductors
31,32, when the operating unit 1 is in the first attitude, and to be pulled by
gravity to break the circuit, such as to move to electrically disconnect said two
conductors 31,32, when the operating unit 1 is in the second attitude, or vice
versa. The contact 30 is disposed in a closed space 33 where it can move into
and out of simultaneous contact with the two conductors 31,32.
[0082] In the electrically conducting state of Figure 8, the contact 30
rests pulled by gravity against two conductors 31,32 electrically connecting
them and closing a circuit partially formed by the two conductors 31,32. In the
electrically non-conducting state of Figure 9, the orientation sensor 3 has been
tilted together with the operating unit such that the contact 30 has been pulled
by gravity away from simultaneous contact with the two conductors 31,32. A
gap has been formed between a conductor 31 and the contact 30. Thereby, the

contact 30 does not electrically connect the two conductors 31,32 and the
circuit partially formed by the two conductors 31,32 is broken.
[0083] As an alternative to the solution where contact 30 is a solid
member, the contact 30 is a fluid contact substance. In this type of alternative,
it is preferred that the orientation sensor 3 is a mercury switch, since these are
widely available and known to be reliable.
[0084] Generally, the contact 30 can comprise metal, but this is not
necessary, since also non-metallic materials and substances can be electrically
conducting.
[0085] The elevator illustrated in Figure 7 is a counterweighted
elevator. However, this is not necessary since the invention can also be
implemented in counterweighless elevators. The hoisting function of the
elevator illustrated in Figure 7 is implemented with a hoisting roping. This is
however not necessary since the invention can also be implemented in
elevators where hoisting is different, such as in hydraulic elevators, or in
elevators with magnetically levitating elevator cars.
[0086] One advantage of the mobile operating unit 1 provided with an
orientation sensor 3 is that it does not necessitate a holder or at least not a
complicated holder. This makes the mobile operating unit 1, the method and
elevator described in this application simply usable with different elevator
layouts and configurations. The mobile operating unit 1 can for instance be
used in one elevator with a holder and in another elevator without a holder.
Figures 10 and 11 illustrate possible ways to position the mobile operating
unit 1 such that it is upright or at least substantially upright attitude, which is
in this case the aforementioned predetermined attitude where the one or more
predetermined criteria are fulfilled. Placement of an elongated mobile
operating unit 1 in this way, even without a holder 4, requires concentration
telling the elevator system 10 that it has not been forgotten by the service
person lying around. More specifically, Figure 10 illustrates that the elongated

mobile operating unit 1 has been placed to lean against a wall of the hoistway
7 in substantially upright attitude. Figure 11 illustrates that the elongated
mobile operating unit 1 has been placed to hang from its cable 6 in upright
attitude.
[0087] Generally, the elevator the elevator can have a normal operation
mode, in particular wherein the elevator is operable by said normal elevator
operation, and a service operation mode, in particular wherein the elevator is
operable by said service operation. The elevator control system can control
switching between these modes, e.g. based on criteria including the
aforementioned one or more criteria, but possibly also other criteria.
[0088] Generally, it is not necessary, even though preferable, that the
operating unit 1 is longitudinal since some the advantages of the invention
may be achieved also with different shapes.
[0089] It is to be understood that the above description and the
accompanying Figures are only intended to teach the best way known to the
inventors to make and use the invention. It will be apparent to a person skilled
in the art that the inventive concept can be implemented in various ways. The
above-described embodiments of the invention may thus be modified or
varied, without departing from the invention, as appreciated by those skilled
in the art in light of the above teachings. It is therefore to be understood that
the invention and its embodiments are not limited to the examples described
above but may vary within the scope of the claims.

CLAIMS
1. A mobile operating unit (1) for an elevator, comprising
an operating interface (2) manually operable by a user to control
movement of an elevator car (5); and
an orientation sensor (3) for sensing orientation of the operating
unit (1).
2. A mobile operating unit (1) according to claim 1, wherein the mobile
operating unit (1) is provided for being connected to an elevator control
system (10).
3. A mobile operating unit (1) according to any of the preceding claims,
wherein the operating unit (1) is elongated in shape.
4. A mobile operating unit (1) according to any of the preceding claims,
wherein operating unit (1) is tiltable around one or more horizontal axes
(x1,x2).
5. A mobile operating unit (1) according to any of the preceding claims,
wherein the state of the orientation sensor (3) is changeable between a first
state and a second state by tilting the operating unit (1) around one or more
horizontal axes (x1,x2), most preferably around anyone of at least two
horizontal axes (x1,x2) pointing in different directions.
6. A mobile operating unit (1) according to any of the preceding claims,
wherein the orientation sensor (3) has a first state when the operating unit (1)
is in a first attitude and a second state when the operating unit (1) is in a
second attitude.
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7. A mobile operating unit (1) according to any of the preceding claims,
wherein the operating unit (1) is elongated in shape, and said first attitude is
an upright attitude, and said second attitude is a tilted attitude.
8. A mobile operating unit (1) according to any of the preceding claims,
wherein the first state is an electrically conducting state and the second state
is electrically non-conducting state, or vice versa.
9. A mobile operating unit (1) according to any of the preceding claims,
wherein the orientation sensor (3) comprises a movable electrically
conductive contact (30), which is arranged to be pulled by gravity to close a
circuit, such as to move to electrically connect two conductors (31,32), when
the operating unit (1) is in the first attitude, and to be pulled by gravity to
break the circuit, such as to move to electrically disconnect said two
conductors (31,32), when the operating unit (1) is in the second attitude, or
vice versa.
10. A mobile operating unit (1) according to any of the preceding claims,
wherein mobile operating unit (1) comprises at least a first button (2a) for
being pressed by a user to signal the elevator control (10) to move the elevator
car (5) upwards, and a second button (2b) for being pushed by a user to signal
the elevator control (10) to move of the elevator car (5) downwards.
11. A mobile operating unit according to any of the preceding claims, wherein
the mobile operating unit (1) comprises a selection switch (2c) for selecting
between a normal operation mode and a service operation mode.
12. An elevator comprising an elevator car (5) and a mobile operating unit (1)
as defined in any of the preceding claims, wherein the elevator is configured
to prevent normal elevator operation if orientation of the operating unit (1)
sensed by aid of the orientation sensor (3) does not fulfil one or more
predefined criteria.
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13. An elevator according to any of the preceding claims, wherein the elevator
comprises a control system (10) for controlling movement of the elevator car
(5).
14. An elevator according to any of the preceding claims, wherein in the
normal elevator operation movement of the car (5) between vertically
displaced landings is automatically controllable by the control system (10).
15. An elevator according to any of the preceding claims, wherein said
elevator comprises a holder (4) for holding the operating unit (1) such
oriented, that the one or more predefined criteria are fulfilled.
16. An elevator according to any of the preceding claims, wherein the elevator
is configured to move the car (5) upwards in response to press of a first button
(2a) by a user, and downwards in response to press of a second button (2b) by
the user, and to stop each said movement when the press of the button in
question stops.
17. An elevator according to any of the preceding claims, wherein the
operating unit (1) is elongated in shape, and said one or more predefined
criteria include at least that the operating unit (1) is in upright position, i.e.
where the longitudinal axis thereof points in vertical or at least substantially
vertical direction.
18. Method for monitoring elevator, which elevator comprises an operating
unit (1) manually operable by a user to control movement of an elevator car
(5), which operating unit (1) is as defined in any of the preceding claims, the
method comprising sensing orientation of the operating unit (1), and if the
orientation does not fulfil the one or more predefined criteria, preventing
normal elevator operation.