U.S. patent application number 10/427641 was filed with the patent office on 2004-11-04 for telescopic support.
Invention is credited to Chuang, Louis.
Application Number | 20040217239 10/427641 |
Document ID | / |
Family ID | 33310211 |
Filed Date | 2004-11-04 |
United States Patent
Application |
20040217239 |
Kind Code |
A1 |
Chuang, Louis |
November 4, 2004 |
Telescopic support
Abstract
A telescopic support includes an external tube, an internal tube
inserted in the external tube and an extending device for extending
the external tube and the internal tube. The extending device may
include a collar mounted on the external tube and a cam mounted on
the collar between a first position for releasing the internal tube
and a second position for pushing the internal tube.
Inventors: |
Chuang, Louis; (Taichung,
TW) |
Correspondence
Address: |
Alan D. Kamrath
Nikolai & Mersereau, P.A.
820 International Centre, 900 Second Avenue South
Minneapolis
MN
55402-3325
US
|
Family ID: |
33310211 |
Appl. No.: |
10/427641 |
Filed: |
May 1, 2003 |
Current U.S.
Class: |
248/125.8 ;
248/159 |
Current CPC
Class: |
F16M 11/28 20130101;
F16M 11/18 20130101; F16M 11/2028 20130101; F16M 2200/08 20130101;
A47F 5/0892 20130101; F16M 13/027 20130101; A47B 96/1425 20130101;
B62H 3/12 20130101; F16M 11/045 20130101 |
Class at
Publication: |
248/125.8 ;
248/159 |
International
Class: |
A47F 005/00 |
Claims
1. (canceled).
2. A telescopic support including: an external tube; an internal
tube inserted in the external tube; and an extending device
including a collar mounted on the external tube, a cam mounted on
the collar for pushing the internal tube relative to the external
tube and a pedal connected with the cam, wherein the extending
device includes a wheel mounted on the internal tube for engagement
with the cam, with the internal tube inserted into the external
tube being vertically arranged, with the internal tube including an
end element adapted to engage a floor, with the external tube
extending vertically above the internal tube opposite to the end
element, with the aperture defined in a lower end of the external
tube, with the pedal located adjacent the end element of the
internal tube to be stepped upon to telescope the external tube
relative to the internal tube.
3. The telescopic support according to claim 2 wherein the cam
defines a recess for receiving the wheel.
4. The telescopic support according to claim 2 wherein the wheel is
a pulley.
5. The telescopic support according to claim 2 wherein the
extending device includes an axle mounted on the internal tube, and
the wheel is mounted on the axle.
6. The telescopic support according to claim 2 wherein the
extending device includes a pin inserted in an aperture defined in
the external tube, an aperture defined in the collar and an
aperture defined in the cam.
7. A telescopic support according including: an external tube; an
internal tube inserted in the external tube; and an extending
device including a collar mounted on the external tube, a cam
mounted on the collar for pushing the internal tube relative to the
external tube and a pedal connected with the cam, wherein the
extending device includes a pin inserted in an aperture defined in
the external tube, an aperture defined in the collar and an
aperture defined in the cam, wherein the internal tube defines a
slot through which the pin extends.
8. The telescopic support according to claim 7 including a spring
between a closed end of the internal tube and the pin.
9. The telescopic support according to claim 8 including a limit
mounted on the pin for contact with the spring.
10. The telescopic support according to claim 8 wherein the pin is
inserted in an aperture defined in the limit.
11. The telescopic support according to claim 2 including a locking
device for locking the cam.
12. A telescopic support including: an external tube; an internal
tube inserted in the external tube; an extending device including a
collar mounted on the external tube, a cam mounted on the collar
for pushing the internal tube relative to the external tube and a
pedal connected with the cam; and a locking device for locking the
cam, wherein the locking device includes a rod movably mounted on
the collar between a releasing position for releasing the cam and a
locking position for locking the cam, with the rod abutting the cam
in the locking position and being in a noninterfering position with
the cam in the releasing position.
13. The telescopic support according to claim 12 wherein the
locking device includes a handle connected with the rod.
14. The telescopic support according to claim 12 wherein the
locking device includes a tube secured to the collar in order to
slideably receive the rod, with the cam movable relative to the
tube, with the cam pivotally mounted to the collar about a pivot
axis, with the rod being slideable in a slide direction parallel to
and spaced from the pivot axis.
15. The telescopic support according to claim 14 wherein the
locking device includes a handle connected with the rod generally
perpendicular to the slide direction.
16. The telescopic support according to claim 15 wherein the tube
defines a slot through which the handle extends.
17. The telescopic support according to claim 16 wherein the rod
defines a hole for receiving a tip of the handle, with the handle
abutting with the slot for preventing removal of the rod from the
tube.
18. The telescopic support according to claim 2 including a locking
device for locking the cam, wherein the locking device includes a
rod movably mounted on the collar between a releasing position for
releasing the cam and a locking position for locking the cam, with
the rod abutting the cam in the locking position and being in a
noninterfering position with the cam in the releasing position.
19. The telescopic support according to claim 18 wherein the
locking device includes a tube secured to the collar in order to
slideably receive the rod, with the cam movable relative to the
tube, with the cam pivotally mounted to the collar about a pivot
axis, with the rod being slideable in a slide direction parallel to
and spaced from the pivot axis.
20. The telescopic support according to claim 19 wherein the
locking device includes a handle connected with the rod generally
perpendicular to the slide direction.
21. The telescopic support according to claim 20 wherein the tube
defines a slot through which the handle extends, and wherein the
rod defines a hole for receiving a tip of the handle, with the
handle abutting with the slot for preventing removal of the rod
from the tube.
Description
FIELD OF INVENTION
[0001] The present invention relates to a telescopic support.
BACKGROUND OF INVENTION
[0002] Taiwanese Patent Publication No. 457922 discloses a
telescopic support consisting of two telescopic elements. Each of
the telescopic elements includes an external tube 20, an internal
tube 30, a spring 22, a plug 23 and a sucking disc 40. The external
tube 20 includes a first end 21 that is reduced and a second end.
The internal tube 30 includes a first end 31 that is enlarged and a
second end. The internal tube 30 is inserted in the external tube
20. The first end 31 of the internal tube 30 abuts the first end 21
of the external tube 20 so as to keep the internal tube 30
connected with the external tube 20. The spring 22 is put in the
external tube 20, and the plug 23 is fit in second end of the
external tube 20 so that the spring 22 pushes the internal tube 30
from the external tube 20. The sucking disc 40 is attached to the
second end of the external tube 20. The second end of the internal
tube 30 of one of the telescopic elements is enlarged (32) in order
to receive the second end of the internal tube 30 of the other of
the telescopic elements in use. The sucking discs 40 contact two
walls so as to suspend the telescopic support. The springs 22 are
essential in keeping the telescopic support suspended. If the
springs 22 are weak, the telescopic support falls easily when
bearing a load. If the springs 22 are strong, the telescopic is
operated with difficulty.
[0003] The present invention is therefore intended to obviate or at
least alleviate the problems encountered in prior art.
SUMMARY OF INVENTION
[0004] It is the primary objective of the present invention to
provide a secure and easily operable telescopic support.
[0005] According to the present invention, a telescopic support
includes an external tube, an internal tube inserted in the
external tube and an extending device for extending the external
tube and the internal tube.
[0006] The extending device may include a collar mounted on the
external tube and a cam mounted on the collar between a first
position for releasing the internal tube and a second position for
pushing the internal tube.
[0007] Other objects, advantages, and novel features of the
invention will become more apparent from the following detailed
description when taken in conjunction with the attached
drawings.
BRIEF DESCRIPTION OF DRAWINGS
[0008] The present invention will be described through detailed
illustration of the preferred embodiment referring to the
drawings.
[0009] FIG. 1 is a front view of a telescopic support according to
the preferred embodiment of the present invention.
[0010] FIG. 2 is a perspective view of the telescopic support of
FIG. 1.
[0011] FIG. 3 is an exploded view of an extending device used in
the telescopic support of FIG. 2.
[0012] FIG. 4 is a perspective view of the extending device of FIG.
3.
[0013] FIG. 5 is a cross-sectional view of the extending device of
FIG. 4.
[0014] FIG. 6 is similar to FIG. 4 but showing the extending device
in another position.
[0015] FIG. 7 is a cross-sectional view of the extending device of
FIG. 6.
[0016] FIG. 8 is similar to FIG. 1 but showing the telescopic
support bearing a bicycle.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
[0017] Referring to FIGS. 1 and 2, according to the preferred
embodiment of the present invention, a telescopic support 1
includes a first tube 10, a second tube 20 telescopically inserted
in the first tube 10, a third tube 30 telescopically inserted in
the first tube 10, a retainer 40 for retaining the second tube 20
in position relative to the first tube 10, an extending device 50
for extending the third tube 30 relative to the first tube 10, a
locking device 60 for locking the extending device 50 and several
hangers 70 mounted on the first tube 10 and/or the second tube 20.
To an end of the second tube 20 is attached an end element 21 for
contact with a surface such as a ceiling. To an end of the third
tube 30 is attached an end element 31 for contact with a surface
such as a floor. On each of the hangers 70 are mounted several
hooks 71 for carrying a load such as a bicycle 80 as shown in FIG.
8.
[0018] Referring to FIG. 3, the first tube 10 defines two apertures
12 near its lower end.
[0019] The third tube 30 includes a closed upper end and an open
lower end. The third tube 30 defines two slots 32 and two apertures
33 as well. Two wheels 34 are mounted on an axle 35 inserted in the
apertures 33. The wheels 34 are in the form of a pulley in the
preferred embodiment.
[0020] A limit 36 defines an aperture 361.
[0021] The extending device 50 consists of a collar 51 and a cam
assembly 57. The collar 51 defines two apertures 52. The cam
assembly 57 includes a pedal 54 and two cams 58 extending from the
pedal 54. Each of the cams 58 defines an aperture 55 and a recess
56. The pedal 54 may be replaced with a grip in an alternative
embodiment.
[0022] In assembly, the lower end of the first tube 10 is inserted
in the collar 51. The collar 51 is put between the cams 58. A
spring 38 and the limit 36 are put in the third tube 30. A pin 37
is inserted in the apertures 55, 52 and 12 and the slots 32 and the
aperture 36. Thus, the collar 51 is secured to the first tube 10.
The cam assembly 57 is pivotally mounted on the collar 51. The
third tube 30 is inserted in the first tube 10. The limit 36 is
secured to the first tube 10. The spring 38 is compressed between
the limit 36 and the closed upper end of the third tube 30, thus
pushing the third tube 30 into the first tube 10.
[0023] The locking device 60 includes a tube 66, a spring 62, a rod
63 and a handle 64. The tube 66 is secured to the collar 51. The
tube 66 defines a slot 61. The spring 62 is put in the tube 66. The
rod 63 is inserted in the tube 66. The rod 63 defines a hole 631
aligned with the slot 61. The handle 64 includes a tip fit in the
hole 631. Thus, a user can move the rod 63 via operating the handle
64.
[0024] Referring to FIGS. 4 and 5, the cam assembly 57 is in a
first position where the cams 58 are not in engagement with the
wheels 34, thus allowing the spring 38 to push the third tube 30
into the first tube 10.
[0025] Referring to FIGS. 6 and 7, the pedal 54 is trodden so as to
pivot the cam assembly 57 from the first position to a second
position. During the pivoting of the cam assembly 57, the cams 58
are in engagement with the wheels 34, thus pushing the third tube
30 from the first tube.
[0026] Therefore, the first tube 10 and the third tube 30 are
extended. The wheels 34 enter the recesses 56 so as to retain the
cam assembly 57 in the second position. An end of the rod 63 is
moved from the tube 66 for limiting one of the cams 58, thus
locking the cam assembly 57 in the second position.
[0027] The present invention has been described via detailed
illustration of the preferred embodiment. Those skilled in the art
can derive variations from the preferred embodiment without
departing from the scope of the present invention. Therefore, the
preferred embodiment shall not limit the scope of the present
invention defined in the claims.
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