FIELD OF INVENTION:

The present subject matter described herein, relates to a door damping
device and, in particular, to a damping device for preventing vibrations during
closing and opening of the door. In an embodiment, the door damping device 5 vice is
provided in a vehicle to damp or absorb vibrations generated when a door is
opened and closed.

BACKGROUND AND PRIOR ART:

In general, different door is provided in the vehicle to open and close
10 different compartments in vehicle. For example, front door opens and closes
driver and co-driver compartment. Rear doors open and close passenger
compartment. Similarly, back door opens and closes luggage compartment. When
a circumferential edge portion of the back door abuts a circumferential edge of an
opening portion in the luggage compartment, the luggage compartment is closed.
15 [003] Further, the back door faces air pressure from inner compartment as well
as from outer air pressure for drag of vehicle. Due to air pressure on the back
door, the sympathetic vibration of the opening/closing of the back door may be
caused to generate uncomfortable noise or uncomfortable feeling. When door is
hard closed, door inner panel can touch body and result in paint peel off or worse,
20 panel crack.
[004] In order to suppress the vibrations and noise at the back door air,
generally, door stoppers are provided that are hard rubber material. Referring to
fig. 1, a door stopper 200 is mounted on mounting hole of back door inner panel
300 at various locations around circumferential edge portion of the luggage
25 compartment. The door stopper 200 projected away from the back door inner
panel 300 has a receiving portion that abuts with side body outer panel 100 of the
back door.
[005] In existing technologies, the door stopper 200 is provided as single rubber
part that acts as a cushion and due to inherent elastic property of rubber, vibrations
3
are absorbed. Therefore, vibration absorbing capabilities of the door stopper 200
depends upon quality of rubber. Accordingly, soft and hard rubber door stopper
are provided to absorb/damp the vibrations. In order to prevent door-body contact
and door vibrations, hard cushion made of rubber is mounted on door, other
surface of which presses against body surface at interfere5 nce.
[006] Further, the soft and the hard door stopper have their limitations. The door
stopper made of soft material cannot take opening and closing force and transfers
the load to back door inner panel. Whereas the door stopper made of hard material
don’t suppress vibrations during vehicle running condition.
10 [007] Therefore, there is a need in the art to modify the structure of the door
stopper that does not completely depend on material.
OBJECTS OF THE INVENTION:
[008] Some of the objects of the present disclosure, which at least one
embodiment herein satisfy, are listed hereinbelow.
15 [009] The principal object of the present invention is to provide a door damping
device to absorb open and close force of back door of vehicle.
[0010] Another object of the present subject matter is to provide a door damping
device to absorb vibrations at back door area of the vehicle.
[0011] Another object of the present subject matter is to provide a spring based
20 door damping device.
[0012] Yet another object of the present subject matter is to provide a spring and
rubber based door damping device.
[0013] These and other objects and advantages will become more apparent when
reference is made to the following description and accompanying drawings.
25 SUMMARY OF THE INVENTION:
[0014] This summary is provided to introduce concepts related to door damping
device. The concepts are further described below in the detailed description. This
summary is not intended to identify key features or essential features of the
4
claimed subject matter, nor is it intended to be used to limit the scope of the
claimed subject matter.
[0015] In an embodiment, the present disclosure relates to a door damping device
for avoiding door movement while vehicle runs on road as well as for preventing
door touching with body when door is hard closed. Further, the door dampi5 ng
device restricts movement of door to avoid generation of vibrations and hence
cause noise. The door damping device comprises a male cushion member, a
female cushion member, a hollow cylindrical structure, two discs, at least one
spring and a seal member. The male cushion member has first shaft, a second
10 shaft, and a cylindrical structure is defined in between the first shaft and the
second shaft. Similarly, the female cushion member having first shaft and a
receiving member, and a cylindrical structure is defined in between the first shaft
and the receiving member. The hollow cylindrical structure defines first end and
second end. The first end defines a hole along central axis (X) to receive the
15 second shaft of the male cushion member and a flange portion extend towards
center of the hollow cylindrical structure from the second end. The first disc is
positioned inside the hollow cylindrical structure and fixed with the first end. First
disc defines a hole to receive the second shaft of the male cushion member
through the cylindrical structure. The second disc has a hole to receive the first
20 shaft of the female cushion member from the second end of the hollow cylindrical
structure. Further, the at least one spring is provided in between the first disc and
the second disc. Due to the atleast one spring, the second disc slidably moves in
the hollow cylindrical structure based on the force applied by the female cushion
member. The seal ring is provided in between the second disc and the flange
25 portion of the hollow cylindrical structure. Further, the seal ring abuts on the
flange portion.
[0016] In an aspect, the male cushion member has a flange portion that extends
inclindely towards the first shaft from edge portion of the cylindrical structure.
5
[0017] In an aspect, the atleast one spring is sandwiched in between the first disc
and the second disc, where the first disc is fixed with the hollow cylindrical
structure and the second disc moves in axial direction due to spring force.
[0018] To further understand the characteristics and technical contents of the
present subject matter, a description relating thereto will be made with referenc5 e
to the accompanying drawings. However, the drawings are illustrative only but
not used to limit scope of the present subject matter.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] It is to be noted, however, that the appended drawings illustrate only
10 typical embodiments of the present subject matter and are therefore not to be
considered for limiting of its scope, for the invention may admit to other equally
effective embodiments. The detailed description is described with reference to the
accompanying figures. In the figures, the left-most digit(s) of a reference number
identifies the figure in which the reference number first appears. The same
15 numbers are used throughout the figures to reference like features and
components. Some embodiments of system or methods in accordance with
embodiments of the present subject matter are now described, by way of example,
and with reference to the accompanying figures, in which:
[0020] Fig. 1 illustrates cross section view of conventional door stopper at back
20 door area of the vehicle;
[0021] Fig. 2 illustrates cross section door damping device, in accordance with an
embodiment of the present subject matter;
[0022] Fig. 3a illustrates male member of the door damping device as shown in
fig. 2, in accordance with an embodiment of the present subject matter;
25 [0023] Fig. 3b illustrates disc member of the door damping device as shown in
fig. 2, in accordance with an embodiment of the present subject matter;
[0024] Fig. 3c illustrates female member of the door damping device as shown in
fig. 2, in accordance with an embodiment of the present subject matter;
6
[0025] Fig. 3d illustrates hollow cylindrical structure of the door damping device
as shown in fig. 2, in accordance with an embodiment of the present subject
matter;
[0026] Fig. 4 illustrates un-assembled view of the door damping device, in
accordance with an embodiment of the present subject matter5 ;
[0027] Fig. 5 illustrates the door damping device in door open condition, in
accordance with an embodiment of the present subject matter; and
[0028] Fig. 6 and 7 illustrate the door damping device in door close condition, in
accordance with an embodiment of the present subject matter.
10 [0029] The figures depict embodiments of the present subject matter for the
purposes of illustration only. A person skilled in the art will easily recognize from
the following description that alternative embodiments of the structures and
methods illustrated herein may be employed without departing from the principles
of the disclosure described herein.
15 DESCRIPTION OF THE PREFERRED EMBODIMENTS:
[0030] The detailed description of various exemplary embodiments of the
disclosure is described herein with reference to the accompanying drawings. It
should be noted that the embodiments are described herein in such details as to
clearly communicate the disclosure. However, the amount of details provided
20 herein is not intended to limit the anticipated variations of embodiments; on the
contrary, the intention is to cover all modifications, equivalents, and alternatives
falling within the scope of the present disclosure as defined by the appended
claims.
[0031] It is also to be understood that various arrangements may be devised that,
25 although not explicitly described or shown herein, embody the principles of the
present disclosure. Moreover, all statements herein reciting principles, aspects,
and embodiments of the present disclosure, as well as specific examples, are
intended to encompass equivalents thereof.
7
[0032] The terminology used herein is for the purpose of describing particular
embodiments only and is not intended to be limiting of example embodiments. As
used herein, the singular forms “a",” “an” and “the” are intended to include the
plural forms as well, unless the context clearly indicates otherwise. It will be
further understood that the terms “comprises,” “comprising,” “includes” and/5 or
“including,” when used herein, specify the presence of stated features, integers,
steps, operations, elements and/or components, but do not preclude the presence
or addition of one or more other features, integers, steps, operations, elements,
components and/or groups thereof.
10 [0033] It should also be noted that in some alternative implementations, the
functions/acts noted may occur out of the order noted in the figures. For example,
two figures shown in succession may, in fact, be executed concurrently or may
sometimes be executed in the reverse order, depending upon the functionality/acts
involved.
15 [0034] Unless otherwise defined, all terms (including technical and scientific
terms) used herein have the same meaning as commonly understood by one of
ordinary skill in the art to which example embodiments belong. It will be further
understood that terms, e.g., those defined in commonly used dictionaries, should
be interpreted as having a meaning that is consistent with their meaning in the
20 context of the relevant art and will not be interpreted in an idealized or overly
formal sense unless expressly so defined herein.
[0035] These and other advantages of the present subject matter would be
described in greater detail with reference to the following figures. It should be
noted that the description merely illustrates the principles of the present subject
25 matter. It will thus be appreciated that those skilled in the art will be able to devise
various arrangements that, although not explicitly described herein, embody the
principles of the present subject matter and are included within its scope.
[0036] In the present subject matter, a door damping device is described to absorb
vibrations. In the present subject matter, the door damping device has combination
30 of spring and rubber to damp the vibrations.
8
[0037] Fig. 2 illustrates cross sectional view of door damping device mounted on
back door inner panel, in accordance with an embodiment of the present subject
matter. The door damping device 500 includes a male cushion member 501, a
cylindrical structure 502, first disc 503, second disc 504, female cushion member
505, and at least one spring 506, 507. Further, all components are connected wit5 h
each other along the central line axis ‘X’.
[0038] Fig. 4 shows the door damping device 500 in un-assembled manner. The
male cushion member 501 is snap fitted with the first disc 503 via one end of the
hollow cylindrical structure 502 and the female cushion member 505 is snap fitted
10 with the second disc 504 via second end of the hollow cylindrical structure 502.
The at least one spring 506, 507 is provided in between the first disc 503 and the
second disc 504. The second disc 504 slides in axial direction due to spring
movement. The second end of the hollow cylindrical structure 502 has opening
diameter 502d to receive the seal ring 508 having internal diameter 508a. The seal
15 ring 508 has interference fit with the hollow cylindrical structure 502 and abuts on
the second end of the hollow cylindrical structure 502. The seal ring 508 acts as a
cushion between the hollow cylindrical structure 502 and the second disc 504
when the door is opened and the at least one spring opens. Whenever there is
sideways vibration on the door, the seal ring acts as cushion and prevent lateral
20 movement of the at least one spring 506, 507. The seal ring 508 is made of
ethylene propylene diene monomer rubber (EPDM) hard sponge material. The
seal ring 508 has internal diameter 508a that is more than diameter 505ba (as
shown in figure 3c) of the female cushion member 505 to allow movement in
axial direction. Further, the internal diameter 508a of the seal ring 508 is less than
25 the diameter 504b of the second disc 504 to avoid direct hitting of the second disc
504 with the hollow cylindrical structure 502.
[0039] Referring to fig. 3a, the male cushion member 501 has first shaft 501a at
one end and second shaft 501d at other end. Further, a cylindrical structure 501c is
defined in between the first shaft 501a and the second shaft 501d. The cylindrical
30 structure 501c defines a diameter 501ca that is more than diameter 501da of the
9
second shaft 501d. The male cushion member 501 further comprises a flange
portion 501b that extends inclined towards the first shaft 501a from edge portion
501cb defined in between the first surface 501cd and longitudinal surface 501ce
of the cylindrical structure 501c. The first shaft 501a is tapered down from first
surface 501cd of the cylindrical structure 501c. The first shaft 501a is snap fitt5 ed
with back door inner panel 100 (as shown in figure 2). The flange portion 501b
rests on the back door inner panel 100 and absorb open and close force applied by
the back door. The male cushion member 501 is made of plastic and rubber. The
first shaft 501a and the cylindrical structure 501c are made of the EPDM rubber.
10 Whereas the second shaft 501d is made of plastic material and snap fitted with
first disc 503.
[0040] Fig. 3b illustrates structure of first disc 503 and second disc 504. The first
disc 503 and the second disc 504 has a hole 503a, 504a along central axis X to
receive the second shaft 501d of the male cushion member 501 and first shaft
15 505a (as shown in figure 3c) of the female cushion member 505. The first disc
503 and the second disc 504 is configured to position inside the hollow cylindrical
structure. The first disc 503 and the second disc 504 is made of mild steel.
[0041] Fig. 3c illustrates structure of the female cushion member 505. The female
cushion member 505 has a first shaft 505a at one end and a receiving member
20 505c at other end. Further, a cylindrical structure 505b is defined in between the
first shaft 505a and the receiving member 505c. The cylindrical structure 505b
defines a first surface 505bb towards the first shaft 505a and a second surface
505bc towards the receiving member 505c. The first shaft 505a projects away
from the first surface 505bb along central axis ‘X’. The female cushion member
25 505 further comprises a neck portion 505d connects the receiving member 505c
with the second surface 505bc of the cylindrical structure 505b. Further, diameter
of the neck portion 505d is smaller than diameter 505ca of the receiving member
505c. The first shaft 505a defines a diameter 505aa that is smaller than the
diameter of the hole 504a of the second disc 504. The first shaft 505a is snap fitted
30 with the hole 504a of the second disc 504 in the hollow cylindrical structure 502.
10
The first shaft 505a and the cylindrical structure 505b are made of the EPDM
rubber. Whereas the receiving member 505c is made of plastic material. The
receiving member 505c has diameter 505ca that is smaller than diameter 505ba of
the cylindrical structure 505b.
[0042] Fig. 3d illustrates structure of the hollow cylindrical structure 502 of th5 e
door damping device 500. The hollow cylindrical structure 502 has first end 502a
towards the male cushion member 501 and a second end (502b) towards the
female cushion member 505. The first end 502a defines a hole 502c along central
axis ‘X’ to receive the second shaft 501d of the male cushion member 501.
10 Accordingly, diameter of the hole 502c is bigger than diameter of the second shaft
501d of the male cushion member 501. At the second end, a flange portion 502e
extend towards center of the hollow cylindrical structure 502 to restrict popping
out of the second disc 504 that is provided inside the hollow cylindrical structure
502 from the second end 502b. The flange portion 502e can be provided by a
15 rolling operation. In another embodiment, the flange portion 502e is provided
after insertion of the first disc 503, second disc 504 and the atleast one spring 506,
507. The hollow cylindrical structure 502 is made of sheet metal that is spot
welded with first disc 503. Other end 502b is open and allows to and fro
movement of the female cushion member 505. When the back door is opened, the
20 at least one spring 506, 507 has a tendency to open up. This spring extension
pushes the second disc 504 toward opened second end 502b. To stop exit of the
second disc 504 from the second end 502b of the hollow cylindrical structure 502,
the flange portion 502e is provided.
[0043] The atleast one spring 506, 607 is helical spring provided in between the
25 first disc 503 and the second disc 504. The at least one spring 506, 507 is fixed
with interior surface 503b of the first disc 503 at one end and with interior surface
504b of the second disc 504 at other end. In the best embodiment of the present
subject matter, number of springs in the atleast one spring 506, 507 are two. In
arrangement of two spring, one spring 506 is positioned above the central axis ‘X’
30 and second spring 507 is positioned below the central axis X or vice versa.
11
Further, the at least one spring 506, 507 has a spring constant ‘K’ to absorb
impact energy on the receiving surface 505c. Further, the spring constant ‘K’ of
the spring depends on the below mentioned Hooke’s law equation:
[0044] F=(-)Kx
K= (-) F/5 x
Where K is spring constant, F is force applied, and x is distance moved.
[0045] In another embodiment of the present subject matter, single spring at
center along line axis xx is provided instead of two springs.
[0046] In the assembled view of the door damping device 500, the first disc 503 is
10 fixed with the first end 502a of the hollow cylindrical structure 502. As shown in
figure 2, the hole 503a of the first disc 503 and the hole 502c of the hollow
cylindrical structure 502 are inline along the central axis ‘X’ to receive the second
shaft 501d of the male cushion member 501. The second shaft 501d of the male
cushion member 501 is snap fitted with the first disc 503. The first disc 503 is
15 welded with interior surface of the hollow cylindrical structure 502. After first
disc 503, at least one spring 506, 507 is provided in the hollow cylindrical
structure 502 and at last the second disc is provided. In another embodiment, the
at least one spring 506, 507 is sandwiched in between the first disc 503 and the
second disc 504 and provided in the hollow cylindrical structure 502. Assembly of
20 the first disc 503, the at least one spring 506, 507, and the second disc 504 is
provided in the hollow cylindrical structure 502. The second disc 504 moves in
axial direction in the hollow cylindrical structure 502 due to the at least one spring
506, 507. Further, the second disc 504 receives the first shaft 505a of the female
cushion member 505 from the second end 502b of the hollow cylindrical structure
25 (502) to make the complete door damping device 500. The diameter 502d of the
second end 502b in between the flange portion 502e is bigger than diameter 505ba
of the cylindrical structure 505b of the female cushion member 505. Therefore,
the female cushion member 505 moves to and fro along the axial direction in the
hollow cylindrical structure 502 upon application of force on the receiving portion
12
505c. As shown in the fig. 2, diameter 503b, 504b of first disc and the second disc
503, 504 is smaller than diameter 502da of the hollow cylindrical structure 502.
[0047] Working of the door damping device:
[0048] The door damping device 500 is snap fitted with the back door inner panel
100 via male cushion member 501 and projected away from the back door i5 nner
panel 100. The male cushion member 501 is fitted with the first disc 503 that is
fixed with the hollow cylindrical structure 502 at one end and the female cushion
member 505 is fitted with the second disc 504 at other end to receive the back
door. The at least one spring 506, 507 is provided in between the first disc 503
10 and the second disc 504. Further, the at least one spring 506, 507 is fixed with the
first disc 503 and the second disc 504. Due to the at least one spring 506, 507, the
second disc 504 moves to and fro in axial direction upon application of impact
force.
[0049] Fig. 5 shows condition of the door damping device 500 when back door
15 100 is open. In back door 100 open condition, the female cushion member 505 do
not have any application of force on the receiving portion 505c therefore, the at
least one spring 506, 507 is in normal position. Fig. 6 and 7 shows condition of
the door damping device 500 when back door 100 is close. In the back door close
condition, the female cushion member 505 receive continues force on the
20 receiving portion 505c. Due to force by the body 200, the female cushion member
505 pushes the second disc 504 in inward direction to absorb the impact force.
The at least one spring 506, 507 stores the impact force and sends back the female
cushion member 505 to original position due to restored spring force when force
is removed. The door damping device 500 allows compression upto ‘z’ mm in
25 axial direction to absorb the impact of back door.
[0050] Based on the above equation 1, spring can be decided based upon the
applied force and distance ‘z’ which the at least one spring has to compress.
[0051] The present door damping device 500 can be applied in any type of
vehicle, such as hatch back, sedan, SUV, MUV. In the door damping device 500,
13
elasticity of the at least one spring can be varied by change in number of coil turns
and coil thickness. Accordingly, flexibility in back door closing performance and
vibration pattern of the back door can be changed without change in body or back
door.
[0052] Further, length of door damping device can be changed easily by makin5 g
new spring and keeping other parts common instead of making new tool of
cushion.
[0053] Further, the present door damping device has application in any other field
apart from vehicle also. For an example, the present door damping device can be
10 applied in household to avoid direct hitting of the door with other stopping means.
[0054] It will be understood by those within the art that, in general, terms used
herein, and especially in the appended claims (e.g., bodies of the appended
claims) are generally intended as “open” terms (e.g., the term “including” should
be interpreted as “including but not limited to,” the term “having” should be
15 interpreted as “having at least,” the term “includes” should be interpreted as
“includes but is not limited to,” etc.). It will be further understood by those within
the art that if a specific number of an introduced claim recitation is intended, such
an intent will be explicitly recited in the claim, and in the absence of such
recitation no such intent is present. For example, as an aid to understanding, the
20 following appended claims may contain usage of the introductory phrases “at least
one” and “one or more” to introduce claim recitations. However, the use of such
phrases should not be construed to imply that the introduction of a claim recitation
by the indefinite articles “a” or “an” limits any particular claim containing such
introduced claim recitation to inventions containing only one such recitation, even
25 when the same claim includes the introductory phrases “one or more” or “at least
one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should
typically be interpreted to mean “at least one” or “one or more”); the same holds
true for the use of definite articles used to introduce claim recitations. In addition,
even if a specific number of an introduced claim recitation is explicitly recited,
30 those skilled in the art will recognize that such recitation should typically be
14
interpreted to mean at least the recited number (e.g., the bare recitation of “two
recitations,” without other modifiers, typically means at least two recitations, or
two or more recitations). Furthermore, in those instances where a convention
analogous to “at least one of A, B, and C, etc.” is used, in general such a
construction is intended in the sense one having skill in the art would 5 understand
the convention (e.g., “a system having at least one of A, B, and C” would include
but not be limited to systems that have A alone, B alone, C alone, A and B
together, A and C together, B and C together, and/or A, B, and C together, etc.).
In those instances where a convention analogous to “at least one of A, B, or C,
10 etc.” is used, in general such a construction is intended in the sense one having
skill in the art would understand the convention (e.g., “a system having at least
one of A, B, or C” would include but not be limited to systems that have A alone,
B alone, C alone, A and B together, A and C together, B and C together, and/or A,
B, and C together, etc.). It will be further understood by those within the art that
15 virtually any disjunctive word and/or phrase presenting two or more alternative
terms, whether in the description, claims, or drawings, should be understood to
contemplate the possibilities of including one of the terms, either of the terms, or
both terms. For example, the phrase “A or B” will be understood to include the
possibilities of “A” or “B” or “A and B.”
20 [0055] While the foregoing describes various embodiments of the invention, other
and further embodiments of the invention may be devised without departing from
the basic scope thereof. The scope of the invention is determined by the claims
that follow. The invention is not limited to the described embodiments, versions
or examples, which are included to enable a person having ordinary skill in the art
25 to make and use the invention when combined with information and knowledge
available to the person having ordinary skill in the art.

We claim:

1. A door damping device (500) comprising:
a male cushion member (501) having first shaft (501a) and second
shaft (501d), and a cylindrical structure (501c) defined in between the firs5 t
shaft (501a) and the second shaft (501d);
a female cushion member (505) having first shaft (505a) and a
receiving member (505c), and a cylindrical structure (505b) defined in
between the first shaft (505a) and the receiving member (505c);
10 a hollow cylindrical structure (502) having first end (502a) and
second end (502b), the first end (502a) defines a hole (502c) along central
axis (X) to receive the second shaft (501d) of the male cushion member
(501) and a flange portion (502e) extend towards center of the hollow
cylindrical structure (502) from the second end (502b);
15 a first disc (503) having a hole (503a) positioned inside the hollow
cylindrical structure (502) and fixed with the first end (502), the hole
(503a) of the first disc (503) and the hole (502c) of the hollow cylindrical
structure (502) are inline along central axis (X) to receive the second shaft
(501d) of the male cushion member (501);
20 a second disc (504) having a hole (504a) to receive the first shaft
(505a) of the female cushion member (505) from the second end (502b) of
the hollow cylindrical structure (502), the second disc (504) slidably
moves in the hollow cylindrical structure (502);
at least one spring (506, 507) provided in between the first disc
25 (503) and the second disc (504), the at least one spring (506, 507) moves
the second disc (504) in axial direction; and
a seal ring (508) provided in between the second disc (504) and the
flange portion (502e) of the hollow cylindrical structure (502) and abuts on
the flange portion (502e).
30 2. The door damping device (500) as claimed in claim 1, wherein the male
cushion member (501) comprises a flange portion (501b) extending inclindely
16
towards the first shaft (501a) from edge portion (501cb) defined in between the
first surface (501cd) and longitudinal surface (501ce) of the cylindrical structure
(501c).
3. The door damping device (500) as claimed in claim 1, wherein the first
shaft (501a) tapered down from first surface (501cd) of the cylindrical structur5 e
(501c) and diameter (501ca) of the cylindrical structure (501c) is more than
diameter (501da) of the second shaft (501d).
4. The door damping device (500) as claimed in claim 1, wherein the cushion
member (505) comprises:
10 the cylindrical structure (505b) defines first surface (505bb) toward the
first shaft (505a) and second surface (505bc) toward the receiving member (505c),
the first shaft (505a) projects away from the first surface (505bb) along central
axis (X) and
a neck portion (505d) connects the receiving member (505c) with the
15 second surface (505bc) of the cylindrical structure (505b), wherein diameter of the
neck portion (505d) is smaller than diameter (505ca) of the receiving member
(505c).
5. The door damping device (500) as claimed in claim 1, wherein the at least
one spring (506, 507) is fixed with interior surface (503b) of the first disc (503) at
20 one end and with interior surface (504b) of the second disc (504) at other end.
6. The door damping device (500) as claimed in claim 1, wherein inner
diameter (508a) of the seal ring (508) is less than diameter (504b) of the second
disc (504) to avoid direct hitting of the second disc (504) with the flange portion
(502d) at the second end (502b) of the hollow cylindrical structure (502).
25 7. The door damping device (500) as claimed in claim 1, wherein when
number of spring in the atleast one spring (506, 507) are two, one spring (506) is
positioned above the central axis (X) and second spring (507) is positioned below
the central axis (X); and
when number of spring in the atleast one spring (506, 507) is one, where
30 the one spring (506) is positioned at center along the central axis (X).
17
8. The door damping device (500) as claimed in claim 1, wherein diameter
(505ba) of the cylindrical structure (505b) of the female cushion member (505) is
smaller than diameter (502d) of the second end (502) of the hollow cylindrical
structure (502).
9. The door damping device (500) as claimed in claim 1, wherein the se5 cond
shaft (501d) of the male cushion member (501) and the first shaft (505a) of the
female cushion member (505) are snap fit with the first disc (503) and the second
disc (504).
10. The door damping device (500) as claimed in claim 1, wherein the second
10 shaft (501d) of the male cushion member (501) and the first shaft (505a) of the
female cushion member (505) are made of plastic material and the first shaft
(501a), the receiving portion (505c), and the cylindrical structure (501b, 505c) are
made of Ethylene Propylene Diene Monomer (EPDM) rubber.