Background of the invention
The present invention relates to the field of suspension of vehicles and
more particularly vehicle telescopic suspension devices and especially twowheeled
vehicles such as bicycles.
5 Suspension devices installed on bicycles improve absorption of shocks
which are linked to deformation of terrain on which the vehicle is used.
Classic suspension devices configured to be attached to the hub of a wheel
comprising a first tube, a second tube sliding relative to the first tube and a main
spring arranged inside said tubes, and also comprising a pretension adjustt-nent
10 stopper of the mah spring installed at the upper end of said first tube.
This type of suspension device especially is described more particularly in
the document EP 1 567 408 which has the features indicated previously and also
has an indication of range of lateral freedom of the first tube sliding in the second
tube, this indication being provided by a graduation marked on the outer surface
15 sf the first tube.
However a disadvantage of this type of device is the difficulty for the user
in handling the suspension device to achieve the appropriate damping.
Bbjec% and summary sf the invention
28 An aim of the invention is to propose a telescopic suspension device
rectifying the above disadvantages.
To achieve this, the pretension ad~ustment stopper of the main spring
comprises a pretension tracking system of the main spring, representative of the
weight of the user.
2 5 It is understood that the pretension adjustment stopper has effect to
compress the main spring which 'Is arranged in a cavity formee by the first tube
and the second tube. As a consequence, the actuation of the pretension
adjustment stopper can adjust the pretension in compress of main spring.
The effect sf rotation sf the pretension stopper in a first direction, about
30 the longitudinal axis sf the first tube, is to increase the tension on the main spring
as soon as the distance between the %wo ends of the spring is decreased relative
to the existing distance prior to rotation in the first direction.
Also, when the pretension stopper is actuated in a second direction,
opposite the first direction, the tension exerted on the spring is diminished
5 because the distance between the two ends of the spring is increase relative to
the existing distance prior to rotation in the second direction.
Adjusting the pretension exerted on the main spring is therefore done by
turning the pretension stopper in the first direction or in the second direction. The
user therefore presses on the pretension stopper to regulate the pretension of the
10 main spring.
Because of the invention, as the pretension stopper comprises the tracking
system, the user visualises immediately, on the pretension adjustment stopper,
the level of pretension when handling the pretension stopper, as a result of which
the pretension tracking system lets him fine-tune the pretension level.
f 5 Accordingly, simple and rapid adjustment of the device can be made as a
function of the weight of the user. The telescopic suspension device is adjusted so
that the tension exerted on the main spring is in correspondence with the weight
of the user. This achieves damping in ratio to the weight of the user.
Preferably, said ad~ustment stopper comprises a body fixed to the end of
20 the first tube; said body houses a plunger threaded externally and screwed into
an inner tapped portion of the body, said plunger is supported against one of the
ends of the main spring, an actuation button is mounted in rotation at an end of
the body by being coupled in rotation to said plunger by a sliding arrangement
having longitudinal groove and rib.
2 5 When the actuation button is actuated in the first direction about the
longitudinal axis, the plunger is also set in rotation. As the body is fixed relative to
the first tube, the plunger moves according to the longitudinal axis towards the
end of the first tube opposite that bearing the stopper. Also, the plunger is in
contact with one of the ends of the spring such that displacement of the plunger
30 causes an increase in pretension of the main spring, which causes adjustment
adapted to the weight of the user.
When the actuation button is actuated in the second direction about the
longitudinal axis, the plunger is also set in rotation in the second direction such
that the plunger decreases the compression undergone by the main spring. The
pretension decreases. To achieve this, the plunger rises back towards the body of
5 the pretension stopper. In this way, compression of the spring is diminished to
where there is adjustment in pretension adapted to the weight of the user, this
ad~ustrnent being made considerably easier by the presence of the tracking
system,
Also, the actuation button, mounted in rotation on the body, comprises a
10 groove and rib arrangement which cooperates with the plunger such that when
the actuation button is set in rotation in the first direction or the second direction
according to the longitudinal axis, the plunger is driven respectively in the first
direction or the second direction.
Said plunger preferably comprises an axial recess in which an extension of
15 the actuation button engages, and said sliding arrangement is defined between
said extension and the inner surface of said axial recess.
The axial recess of the plunger receives the extension of the actuation
button, The inner surface of the axial recess of the plunger comprises ribs and
grooves which cooperate with the extension of the actuation button. In this way,
20 when the actuation button is set in rotation in the first direction the extension is
set in rotation, and the plunger is also set in rotation in the first direction by the
plunger and the extension of the actuation button comprising complementary ribs
and grooves. This achieves direct driving of the plunger by action on the actuation
button, resulting in simple and rapid ad~ustmenot f the suspension device.
25 Advantageously, the actuation button comprises an external prehension
part fitted with a window, said actuation button is fixed to said extension, a
passage is defined between the plunger and the extension, on the one hand, and
between the extension and the button, on the other hand, this passage passing
opposite the window, the pretension tracking system comprises a flexible band,
30 housed in the passage, bearing graduations representative sf the weight of a
user, and the flexible band is fixed to a point of the plunger. The flexible band can
be attached to the plunger by means such as adhesive means or means such as
locating lugs or an equivalent means.
When the actuation button is set in rotation according to the first direction,
one of the ends of the flexible band fixed to a point of the plunger undergoes
5 longitudinal displacement according to the longitudinal axis towards the interior of
the first tube, Displacement of the flexible band is connected directly to
displacement of the plunger. Displacement of the flexible band occurs inside the
passage defined between the plunger and the extension on the one hand and
between the extension and the button on the other hand.
10 As a consequence, the flexible band arranged in the passage made
opposite the window shifts and scrolls the graduations made on the upper part of
the band. When the graduation which corresponds to the weight of the user is
displayed in the window, the result is adjustment of the telescopic suspension
device as a function of the weight of the user. In this way, the pretension exerted
15 on the main spring of the telescopic suspension device is as a function of the
weight of the user.
Advantageously, according to another embodiment the pretension tracking
system of the main spring is supported by the extension, the actuation button is
mobile longitudinally relative to the plunger between two spaced longitudinally
20 stops, and the tracking system is supported by the actuation button itself. The
pretension tracking system advantageously comprises graduation scales indicating
different user weights. Each graduation can represent an echelon of 5 kilograms
or even any other graduation representative of the weight of a user.
The extension of the actuation button comprises in its lower part
25 cooperation elements with the stops present in the upper part of the plunger. The
actuation button is in an actuation position when the cooperation elements
cooperate with the stops arranged on the plunger, such that the graduations
borne on the extension of the actuation button can be read by the user.
When the actuation button is actuated in the first direction, it directly
30 drives the plunger in rotation in the first direction, As a consequence, the plunger
moves longitudinally according to the longitudinal axis so as to compress the main
spring and increase the pretension of the main spring. Also, in the same
movement as the plunger the actuation button penetrates the body. To regulate
pretension, the actuation button is turned until the graduation corresponding to
the weight of the user is aligned with the upper surface of the pretension stopper,
5 resulting in simple and rapid adjustment of the suspension device as a function of
the weight of the user.
According to another embodiment, the actuation button comprises
articulated fins.
When the fins, mounted in rotation relative to the upper part of the
10 actuation button, are positioned in planes substantially parallel and perpendicular
to the upper surface of the pretension stopper, said fins offer a prehension
surface for easily gripping and actuating the actuation button.
Also, the articulated fins can be retracted by being positioned so as to join
the upper surface of the stopper to avoid any accidental adjustment of the
15 pretension.
According to another embodiment, the pretension tracking system of the
main spring is supported by a rod inserted into a housing formed in the
extension; a ratchet mechanism connected to the rod is arranged at a lower end
of the extension.
20 The housing comprises an orifice made on the upper surface of the
actuation button such that the rod is extracted by the upper part of the actuation
button.
The rod has a deployed position in which it projects from the pretension
stopper, and a retracted position in which it is housed in the pretension stopper.
2 5 When the rod is in the unlocked position, a part of the rod is extracted of
the orifice realised in the actuation button. In this way, a part of the rod is
arranged above the upper surface of the actuation button. Said rod is held in the
unlocked position by means of a second spring. The second spring has a first end
supported against the lower face of the housing of the plunger. The second spring
30 also comprises a second end which cooperates with the rod so as to keep said rod
in tension.
Also, the tracking system comprises a graduation for tracking the weight
corresponding to the preferred pretension. As a consequence, when the actuation
button is actuated in the first direction about the longitudinal axis and when the
rod is kept in the unlocked position, the plunger moves towards the end opposite
5 that bearing the stopper and compresses the main spring. Also, by way of the
second spring supported against the inner surface of the plunger, the rod follows
the displacement sf the plunger,
It is clear that the graduations arranged on the rod accompany
displacement of the plunger. In this way, ad~ustment of the suspension device
18 happens when the graduation corresponding to the weight of the user is aligned
with the upper edge of the window made in the actuation button,
Also, the rod is kept in the locked position by means of blockage elements
arranged at the lower end of said rod which cooperate with the lower surface of
the extension of the actuation button. Because of this aspect, the adjustment rod
15 is arranged in the housing, which avoids deterioration due to the external
environment.
According to yet another variant embodiment, the button has the form of a
key which engages in an orifice made in the upper part of the pretension stopper,
the key cooperating with the plunger.
20 The pretension stopper comprises a window in which the key is introduced
such that the key cooperates with the plunger, and said key follows the
displacement of the plunger. In this way, the key comprising the graduations
representing the weight of the user arranged on the part introduced to the orifice,
follows the displacement of the plunger when the actuation button is actuated to
25 align the graduation corresponding to the weight sf the user with the upper
window edge.
Also, the adjustment key is removable so that said key does not undergo
any aggression from the external environment.
Also, the invention relates to a bike frame comprising at least one
30 telescopic suspensi~nd evice according to the invention,
Brief description of the drawings
The invention will be more clearly understood from the following
description of embodiments of the invention given by way of non-limiting
example in reference to the attached drawings, in which:
5 - figure f is a view of a bike on which is installed a suspension device
according to the invention;
- figure 2 is a view in perspective of a fork comprising a suspension device
according to the invention;
- figure 3 is a sectional view of the suspension device according to the
10 invention;
- figure 4 is an exploded view of a first embodiment of the pretension
adjustment stopper;
- figures 5A and 5B are sectional views of the first embodiment of the
pretension adjustment stopper;
15 - figures 6A and 6B are sectional views of the first embodiment of the
pretension adjustment stopper mounted on the suspension device in a first
position and a second position;
- figure 7 is a plan view of the first embodiment of the pretension
adjustment stopper;
20 - figure 8 is a sectional view of a second embodiment of the pretension
adjustment stopper;
- figure 9 is a view in perspective of a second embodiment of the pretension
adjustment stopper;
- figure f 0 is an exploded view of the second embodiment of the pretension
2 5 adjustment stopper mounted on the suspension device in a first position;
- figure 11 is a sectional view of the second embodiment of the pretension
adjustment stopper mounted on the suspension device in a second
position;
- figure 12 is a view in perspective of a third embodiment of the pretension
30 adjustment stopper;
- figures 83A and 138 are sectional views of the third embodiment sf the
pretension ad~ustment stopper mounted on the suspension device where
the plunger is in a first position;
- figures f4A and 1481 are sectional views of the third embodiment of the
5 pretension ad~ustment stopper mounted on the suspension device where
the plunger is in a second position;
- figures 1158 and f5B is sectional view of the fourth embodiment of the
pretension adjustment stopper.
10 Detailed deserip%ion of the invention
Figures f and 2 illustrate a suspension device 18 according to the present
invention mounted on a bike 400 fitted with a frame 418 comprising a directional
fork 41 2 comprising two arms 41 4 and 416 attached to each other by means of
a connector 418 connected sol'ldly to a direction tube 1120. The suspension
15 device is connected to the hub 422 of a wheel 424.
According to another example, the fork 412 could comprise a single arm
connected to the direction tube of the fork.
In figure 2 and figure 3, the arm 414 comprises a first tube 112 having a
diameter less than the diameter of a second tube 14. Also, said first tube 12 is in
26 part inserted into the second tube 14. Also, the first tube 12 is mounted sliding
relative to the second tube 14 according to a bngitudinal axis A of the first tube
32
Also, a pretension stopper 18 is screwed at an upper end 16 of the first
tube 12, by means of a first tapping 28 arranged at the upper end of an inner
25 surface f2a of the first tube 1% and a thread 2% arranged on an outer surface
24 of a body 28 of the pretension stopper 18. The body 28 of the pretension
stopper extends according to the Pongitudinal axis A. The body 28 of cylindrical
form has an inner portion in a bore 29 extending according to the longitudinal
axis A. The bore 29 comprises a second tapping 28a through which a plunger 30
30 is screwed comprising a second thread 30a an an outer wall,
The pretension stopper 18 also comprises an actuation button 32 mounted
to rotate relative to the body 28 according to the longitudinal axis A of the first
tube 3 2 .
The suspension device f 6 also comprises a main spring 34 arranged inside
5 the first tube 12 and the second tube 14. A first end 34a of the main spring 34
is supported against the inner face f 2b of the first tube f 2. Also, a second end
34b of the main spring 34 is supported against a lower face 381s of the plunger
30.
According to a first embodiment, in reference to figures 4 to 6, the
10 actuation button 32 is mounted to rotate relative to the body 28 according to the
longitudinal axis A. It is also illustrated that the actuation button comprises a
window 36 Flush with the upper surface 32a of the actuation button 32. Also, the
outer surface 24 of the body comprises the thread 22. In this example, the
window 36 is protected by a transparent protection piece 37 at the same time
f 5 protecting and allowing to read the available information.
Also, figures 6A and 6B show the pretension stopper 38 according to the
first embodiment mounted at the upper end 16 of the first tube 12. The
pretension stopper 18 comprises the plunger 38 which comprises the lower face
30b on which the first end 34b of the main spring 34 is supported. By way of
20 the exploded view of figure 4, it is clear that the plunger 30 comprises an axial
recess 30c in which is inserted an extension 38 connected to the actuation
button 32. Also, the actuation button 32 comprises cooperation means with the
wall 38a of the extension 38.
In keeping with the invention, the suspension device also comprises a
25 pretension tracking system 39 of the main spring representative of the weight of
the user. In this embodiment, the pretension tracking system 39 comprises a
flexible band 48 fixed to the plunger 38, More precisely, a first end 40a of the
flexible band 40 is fixed to the plunger 38. The flexible band 48 can be fixed by
means such as adhesive means or means such as locating lugs or other means
30 which can fulfil this function. Also, a second end 4Ob of the flexible band stays
free.
The flexible band 40 'Is arranged 'In a passage 41 made between the
plunger 30 and the extension 38 on the one hand and between the extension 38
and the actuation button 30 on the other hand. In this way, the flexible band 40
is arranged opposite the window 36.
5 In figure 7, in a plan view, the window 36 shows an upper face 40c of the
flexible band 40 which has graduations 39a representing different weights of a
user. Each graduation 39a can again represent an echelon of 5 kilos or any scale
representative of weight.
In reference to figures 6A and 6B, rotation of the actuation button 32
10 relative to the body 28 is carried out in a first direction SI about the longitudinal
axis A, the actuation button 32 drives the extension 38 in its rotation movement.
Said extension 38 comprises second cooperation means 38b of rib type. The
extension 38 drives the plunger 38 in rotation in the first direction Sl. As the
plunger 30 is screwed relative to the body 28 by means of the thread 30a, said
15 plunger 30 transforms the rotation movement into translation movement. The
plunger 30 descends inside the first tube $2. The main spring is compressed,
such that pretension grows.
Also, in reference to figure 5B, it is clear that the plunger 30 drives the
flexible band 40 in its movement. In this way, the flexible band scrolls past the
20 window 36. Said graduations 39a made on the upper face 40c of the flexible
band 48 scroll past the window 36 when the flexible band is set in motion by
actuation of the stopper so as to indicate to the user to which weight the
pretension of the main spring corresponds.
When there is rotation of the actuation button 32 relative to the body in
25 the second direction S2 according to the longitudinal axis A, the actuation button
32 drives in its rotation movement the extension 38. As the ribs 38b cooperate
with grooves 38b formed in the wall of the axial recess 30c of the plunger 30,
the extension drives the plunger 30 in rotation in the second direction S2. As the
plunger 38 is screwed into the body 28, said plunger 30 transforms the rotation
30 movement into translation movement. In this way, the plunger is mounted inside
the body towards the end which bears the stopper 118, such thatpretension
diminishes.
In this way, setting in rotation in the first direction Sf or the second
direction S2 sf the actuation button 32 ceases when the graduation 39a
5 corresponding to the weight sf the user is indicated in the window 36,
It is also illustrated that the second end 40b of the flexible band comprises
a bead which stops against the wall 38c of the extension 38 when the plunger
36) and the flexible band 40 have reached the maximum of their travel.
In reference to figures 8 to 3.1, a second embodiment will now be
18 described.
In the same way in the first embodiment, the pretension stopper 118
comprises the actuation button f32 which is mounted to rotate relative to the
b ~ d 1y2 8 according to the longitudinal axis A.
The plunger 1130 comprises a thread on the outer surface %38a, The
15 thread 130a sf the plunger f 30 cosperates with the tapping f 28a made on the
inner wall of the body.
Also, the plunger 130 comprises the axial recess f38c and also comprises
the longitudinal grooves 130b into which the ribs f38b of the extension f 38 are
inserted. The extension 138 is fixed to the actuation button 132. The actuation
20 button and the extension can be two separate pieces assembled or made in a
single piece.
The actuation button f 32 also comprises an orifice 136 made at the upper
surface 1132a which opens on a housing 43 formed in the extension 3.38, said
housing 143 extending longitudinally according to the longitudinal axis A. The
25 window 3.36 allows passage sf a rod f 42, forming part of the pretension tracking
system, which extends longitudinally according to the longitudinal axis A in the
housing 143. This rod 142 has a deployed position in which it projects out of the
stopper f 18 accord'lng to the longitudinal direction A, and a retracted position in
which it is entirely housed inside the stopper 1118. In this example, the rod 1142
30 comprises on an outer face the pretension tracking system $39 comprising the
scale of graduations f 39a representative of the weight of a user. The rod 142 is
hollow and receives a second spring 144 inside. The second spring which extends
according to the longitudinal axk comprises a first end 144a supported against
an inner wall I30d of the plunger 130 and also comprises a second end 144b
supported against an inner face 142a of the rod 142. The rod 142 also
5 comprises in its lower part 342b lugs I46 which cooperate with the lower
surface of the extension when the rod 142 is in a locked position.
In figure 16, the rod 142 is in a retracted position when the lugs 246
arranged in the lower part 142b of the rod 142 are held supported against the
Power surface 138a of the extension 11138 by means of a force parallel to the
10 longitudinal axis A exerted by the second spring f 44 on the rod 142.
In figure f f, the rod 142 is in a deployed position. To move from the
retracted position to the deployed position, rotation of the rod 142 is described
according to the first direction %I or the second direction S2 such that the lugs
146 are aligned with guides 148 extending in the hous'lng according to the
15 longitudinal axis. The rod I42 undergoes displacement acc~rding to the
longitudinal axis. In this way, the graduations f39a appear to perform
ad~ustmenot f the suspension device %OD
Next, there is rotation of the actuation button 132 relative to the body
3.28 according to the first direction Sf or according to the second direction S2
20 about the longitudinal axis A. The actuation button I32 and the extension 138
which is connected thereto drive the plunger 138 in rotation which according to
the first direction Sf or the second direction S2. Since the plunger 138 is
mounted by a thread on the body f 28, said plunger 130 transforms the rotation
movement into translation movement according to the longitudinal axis A. The
25 plunger 130 drives in its translation movement the second spring 144 which is
supported against the lower surface 130d.
When the plunger 130 moves towards the lower end P12b of the first
tube f 12, the second spring 144 and the rod 142 also move towards the lower
end f12b of the first tube 112. In the same way, the plunger 338 moves
30 towards the upper end 16 of the first tube 112, the second spring ib44 and the
rod 142 also describe a movement towards the upper end f 16 OF the first tube
132. In this latter case the part of the rod 142 extracted from the pretension
stopper f 18 is bigger.
When the graduation 139a corresponding to the weight of the user is
?
aligned with the edge f36a of the window 136, rotation of the actuation button
5 132 is stopped, then the rod 142 is returned to the retracted position.
In reference to figures 32 to 14, a third embodiment of the invention will
now be described,
In the same way as for the preceding embodiments, the pretension stopper
218 comprises an actuation button 232, a body 228, a plunger 230. The
10 extension 238 comprises on the outer face the pretension tracking system 239
comprising the graduation scale 239a representative of the weight of the user.
Also, the extension 238 is fixed to the lower part of the actuation button
230. The extension 238 comprises in its lower part 238c blockage elements
constituted by lugs 248 which cooperate with cavities 259 arranged in the upper
15 par% of the axial recess 2306 of the plunger 230.
To complete adjustment of the suspension device 10, the extension 238
connected to the actuation button 232 is partially extracted from the axial recess
230~T.h e extension 238 is slid into the plunger 238 by means of ribs 238b
cooperating with the grooves 23Bb of the plunger until the lugs 248 are blocked
20 in the cavities 259.
Also, the actuation button 232 comprises fins mounted in notation
according to an axis perpendicular 5 to the longitudinal axis A. In this way the
fins 260 present a lower surface plane 260a which matches the form sf the
stopper 2118. When the fins 260 have completed rotation of 90' about the axes
25 B, the flat surfaces 260a have the advantage of forming a prehension surface of
the actuation button for easier rotatbn of the actuation button 232.
In reference to figures 314A and i$B, when there is rotation sf the
actuation button 232 according to the first direction S1 or according to the
second direction SZ, the fins 260 are positioned in planes parallel to the
30 longitudinal axis A, and the lugs 248 cooperate with the cavities 259. The
rotation of the actuation button directly drives the plunger 232 in rotation
according to the longitudinal axis A. When the graduation 239a corresponding to
the weight of the user is aligned with the edge 236a of the window 236, rotation
of the actuation button 232 is discontinued,
According to figures f3A and 13B, in the retracted position, the extension
5 38 connected to the actuation button is fully introduced to the axial recess 232c
of the plunger, It is also illustrated that the actuation button compr'lses in its
upper part 232a position-locking means comprising a ring 231 inserted into in a
complementary form 233 arranged in the upper part of the stopper 218.
According to a fourth embodiment, the stopper 318 comprises the body
90 328 mounted screwed on the first tube 312, the actuation button 332 and the
plunger 330 screwed inside the body 328. The actuation button 332 takes the
form of a removable key 332. The stopper 318 comprises a window 336.
The key 332 comprises prehension lugs 332a. The key 33% also
comprises the extension 338 comprising the pretension tracking system. The key
15 332 also comprises in its lower part cooperation means 334 which are configured
to cooperate with the cavity 359 located on the inner surface of the axial recess
330c of the plunger such that the key 332 can be connected to the plunger 338.
For ad~ustment of the suspension device 10, the key 332 is inserted into
the axial recess 3306 of the plunger until the cooperation means 334 are blocked
20 in the cavity 359.
With rotation of the key 33% according to the first direction S1 or
according to the second direction S2, the key directly drives the plunger 338 in
rotation about the longitudinal axis A, also causing the rise or the descent sf the
plunger and, consequently, a decrease or increase in pretension. When the
25 graduation 339a corresponding to the weight of the user is aligned with the edge
336a of the window 336, rotation of the key 332 is discontinued,
Also, the stopper 3x8 comprises a cover 3%8a mounted pivoting so as to
conceal the ax~arl ecess 3 3 0 ~fo rmed inside the plunger 330 when the key 332
is withdrawn from the axial recess 330~.
3 0

We Claim::
1. The telescopic suspension device (18) configured to be attached to the hub
(422) of a wheel (424) comprising a flrst tube (12, 112, 212), a second
tube (14, 114, 214) sliding relative to the first tube and a main spring (34,
134, 234) arranged inside said tubes, and further comprising a pretension
adjustment stopper (18, 1 18, 218, 318) of the main spring (34, 134, 234)
installed at the upper end (16) of said first tube (12, 192, 2121,
characterized in that the pretension adjustment stopper (18, f 18, 218) of
the main spr'lng comprkes a pretension tracking system (39, 139, 239) of
the main spring (34, 134, 234) representative of the weight of the user.
2. The telescopic suspension device (10) according to claim 1, characterized
in that said adjustment stopper (18, 118, 218, 318) comprkes a body (28,
128, 228) fixed to the upper end (16) of the first tube, in that said body
(28, 128, 228) houses a plunger (30, 130, 230, 330) threaded externally
and screwed into a tapped inner portion of the body (28, 128, 2281, in that
said plunger (30, 130, 230, 330) is supported against one of the ends
(34b, E34b, 234b) of the main spring (34, 134, 2341, and in that an
actuation button (32, 132, 232, 332) is mounted in rotation at an end of
the body (28, 128, 228) and coupled in rotati~nto said plunger (30, 130,
230, 330) by a sliding arrangement having longitudinal groove (30b) and
rib (38b).
25 3. The telescopic suspension device (10) according to claim 2, characterized
in that said plunger (38) comprises an axial recess (30c) wherein an
extension (38) of the actuation button (32) engages, and in that said
sliding arrangement is defined between said extension and the inner
surface sf said axial recess.
4. The telescopic suspension device (10) according to claim 3, characterized
in that the actuation button (32) comprises an external prehension part
fitted with a window (36), in that said actuation button (32) is fixed to said
extension (381, in that a passage (41) is defined between the plunger (30)
and the extension (381, on the one hand, and bemeen the extension (38)
and the button (321, on the other hand, this passage (41) passing opposite
the window (361, in that the pretension tracking system (39) comprises a
flexible band (48), housed in the passage, bearing graduations (39a)
representative of the weight of a user, and in that the flexible band (40) is
fixed to a point of the plunger (30) and opposite the window (361, such
that actuation of the actuation button scrolls the graduations (39a) in front
sf the window (36) and modifies the pretension of the main spring (34).
5. The telescopic suspension device (10) according to claim 3, characterized
in that the pretension tracking system (239) is supported by the extension
(2381, in that the actuation button (232) is mobile longitudinally relative to
the plunger (230) between two cavities (259) spaced longitudinally, and in
that the tracking system (239) is supported by the button itself.
20 6, The telescopic suspension device (10) according to claim 5, characterized
in that the actuation button (232) comprises articulated fins (268) each
joining a part of the upper surface of the stopper (218).
7. The telescopic suspension device (10) according to claim 3, characterized
2 5 in that the pretension tracking system (139) of the main spring (134) is
supported by a rod (142) inserted into a housing (143) formed in the
extension (¶.38), and in that a ratchet mechanism connected to the rod
(142) is arranged at a lower end (138a) of the extension.
30 8. The telescopic suspension device according to claim 3, characterized in that
the button (332) has the form of a key bearing the pretension tracking
system (339) which engages in the upper part of the stopper (318), the
key (332) cooperating with the plunger (338).
9. Frame (410) of a bike (400) comprising at least one suspension device (10)
5 as claimed in any one of the preceding claims.