U.S. patent application number 14/597687 was filed with the patent office on 2016-07-21 for stepless retractable handle assembly for luggage.
The applicant listed for this patent is HOKEI CORPORATION. Invention is credited to James TSAI.
Application Number | 20160206068 14/597687 |
Document ID | / |
Family ID | 56406824 |
Filed Date | 2016-07-21 |
United States Patent
Application |
20160206068 |
Kind Code |
A1 |
TSAI; James |
July 21, 2016 |
STEPLESS RETRACTABLE HANDLE ASSEMBLY FOR LUGGAGE
Abstract
A stepless retractable handle assembly for luggage includes a
handle grip and two retractable bars connected to the handle grip
in such a manner that when pressed a press-button in the handle
grip, two transmission plates in the handle grip are forced by the
press-button to move transversely in reverse directions, and two
connection shafts are forced by the transmission plates to move
vertically in the respective retractable bars in biasing respective
anchor clamps away from the inside walls of the outer tubes of the
respective retractable bars for allowing adjustment of the height
of respective inner tubes of the retractable bars. When released
the press-button after the adjustment, the anchor clamps are
returned to abut against the inside walls of the respective outer
tubes, locking the inner tubes in the adjusted position.
Inventors: |
TSAI; James; (TAICHUNG CITY,
TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
HOKEI CORPORATION |
Taichung City |
|
TW |
|
|
Family ID: |
56406824 |
Appl. No.: |
14/597687 |
Filed: |
January 15, 2015 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
Y10T 16/473 20150115;
A45C 13/262 20130101; A45C 2013/267 20130101; Y10T 16/451 20150115;
A45C 13/26 20130101 |
International
Class: |
A45C 13/26 20060101
A45C013/26 |
Claims
1. A stepless retractable handle assembly for luggage, comprising:
a handle grip comprising a bottom grip shell and a top grip shell
mounted on a top side of said bottom grip shell, said top grip
shell comprising a button slot; two retractable bars, each said
retractable bar comprising an outer tube and an inner tube axially
slidably inserted into said outer tube, said inner tube having a
top end thereof fixedly connected to said bottom grip shell of said
handle grip; a control unit comprising a press-button and a first
teturn device, said press-button being vertically movably mounted
in said button slot of said top grip shell of said handle grip,
said press-button comprising two first pushing abutment portions
located at a bottom side thereof, said first teturn device being
mounted between said bottom grip shell of said handle grip and said
press-button; a transmission unit comprising two transmission
plates, two bearing blocks and two connection shafts, said two
transmission plates being transversely movably mounted in said
bottom grip shell of said handle grip, each said transmission plate
comprising two first bearing portions located at one end thereof
and respectively abutted against said first pushing abutment
portions of said press-button and a second pushing abutment portion
located at an opposite end thereof, said two bearing blocks being
respectively affixed to respective top ends of said inner tubes of
said retractable bars, each said bearing block comprising a second
bearing portion abutted against the second pushing abutment portion
of one respective said transmission plate, said two connection
shafts being respectively inserted into said inner tubes of said
retractable bars and respectively connected to respective bottom
ends of said bearing blocks; and two positioning units, each said
positioning unit comprising an anchor clamp holder, an anchor clamp
and a second teturn device, said anchor clamp holder being mounted
in said inner tube of one respective said retractable bar and
connected to a bottom end of one respective said connection shaft
for movement with said inner tube of one respective said
retractable bar relative to the associating said outer tube, said
anchor clamp being pivotally connected to said anchor clamp holder
and disposed in said outer tube of one respective said retractable
bar and movable to abut against or release from an inside wall of
said outer tube of the respective said retractable bar subject to
vertical displacement of said anchor clamp holder in the respective
said retractable bar, said second teturn device being stopped
against said anchor clamp holder.
2. The stepless retractable handle assembly for luggage as claimed
in claim 1, wherein said anchor clamp holder comprises a fixed
holder frame and a movable holder frame, said fixed holder frame
being fixedly fastened to said inner tube of one respective said
retractable bar and comprising a first locating hole, said movable
holder frame being connected to the bottom end of the respective
said connection shaft and comprising a first longitudinal sliding
slot; each said positioning unit further comprises a first pivot
pin inserted through said first locating hole of the respective
said fixed holder frame and said first longitudinal sliding slot of
the respective said movable holder frame; said anchor clamp is
pivotally connected to a bottom end of the respective said movable
holder frame.
3. The stepless retractable handle assembly for luggage as claimed
in claim 2, wherein said movable holder frame of said anchor clamp
holder comprises a first lateral hole and a second lateral hole;
said anchor clamp comprises a first clamping arm and a second
clamping arm, said first clamping arm comprising a first transverse
guide hole located in one end thereof and a first pivot hole
disposed adjacent to said first transverse guide hole, said second
clamping arm comprising a second transverse guide hole located in
one end thereof and a second pivot hole disposed adjacent to said
second transverse guide hole; each said positioning unit further
comprises a first pivot bolt and a second pivot bolt, said first
pivot bolt being inserted through said first lateral hole of the
respective said movable holder frame and said first transverse
guide hole of the respective said first clamping arm, said second
pivot bolt being inserted through said second lateral hole of the
respective said movable holder frame and said second transverse
guide hole of the respective said second clamping arm; said first
pivot, pin is inserted through said first pivot hole of the
respective said first clamping arm and said second pivot hole of
the respective said second clamping arm.
4. The stepless retractable handle assembly for luggage as claimed
in claim 3, wherein said anchor clamp further comprises a first
friction member and a second friction member, said first friction
member being mounted at an opposite end of the respective said
first clamping arm and releasably abutted against the inside wall
of said outer tube of the respective said retractable bar, said
second friction member being mounted at an opposite end of the
respective said second clamping arm and releasably abutted against
the inside wall of said outer tube of the respective said
retractable bar.
5. The stepless retractable handle assembly for luggage as claimed
in claim 3, wherein said first clamping arm comprises a first
spring groove extending around said first pivot hole of the
respective said first clamping arm; said second clamping arm
comprises a second spring groove extending around said second pivot
hole of the respective said second clamping arm; said anchor clamp
further comprises two torsion springs respectively mounted on two
opposite ends of the respective said first pivot pin and
respectively accommodated in said first spring groove in said first
clamping arm and said second spring groove in said second clamping
arm.
6. The stepless retractable handle assembly for luggage as claimed
in claim 2, wherein said fixed holder frame further comprises a
second locating hole spaced below the associating said first
locating hole; said movable holder frame further comprises a second
longitudinal sliding slot spaced below the associating said first
longitudinal sliding slot; each said positioning unit further
comprises a supplementary anchor clamp, said supplementary anchor
clamp being pivotally connected the bottom end of the respective
said movable holder frame by a respective second pivot pin, said
second pivot pin being inserted through said second locating hole
of the respective said fixed holder frame and said second
longitudinal sliding slot of the respective said movable holder
frame.
7. The stepless retractable handle assembly for luggage as claimed
in claim 6, wherein said movable holder frame of said anchor clamp
holder comprises a first lateral hole, a second lateral hole
opposite to said first lateral hole, a third lateral hole spaced
below said first lateral hole and a fourth lateral hole spaced
below said second lateral hole; said anchor clamp comprises a first
clamping arm and a second clamping arm, said first clamping arm
comprising a first transverse guide hole located in one end thereof
and a first pivot hole disposed adjacent to said first transverse
guide hole, said second clamping arm comprising a second transverse
guide hole located in one end thereof and a second pivot hole
disposed adjacent to said second transverse guide hole; each said
positioning unit further comprises a first pivot bolt and a second
pivot bolt, said first pivot bolt being inserted through said first
lateral hole of the respective said movable holder frame and said
first transverse guid3e hole of the respective said first clamping
arm, said second pivot bolt being inserted through said second
lateral hole of the respective said movable holder frame and said
second transverse guide hole of the respective said second clamping
arm; said first pivot pin is inserted through said first pivot hole
of the respective said first clamping arm and said second pivot
hole of the respective said second clamping arm; said supplementary
anchor clamp comprises a third clamping arm and a fourth clamping
arm, said third clamping arm comprising a third pivot hole located
in one end thereof, said fourth clamping arm comprising a fourth
pivot hole located in one end thereof; said second pivot pin is
inserted through said third pivot hole of the respective said third
clamping arm and said fourth pivot hole of the respective said
fourth clamping arm; each said positioning unit further comprises a
third pivot bolt and a fourth pivot bolt, said third pivot bolt
being inserted through said third lateral hole of the respective
said movable holder frame and stopped. at the outer perimeter of
the respective said third clamping arm, said fourth pivot bolt
being inserted through said fourth lateral hole of the respective
said movable holder frame and stopped at the outer perimeter of the
respective said fourth clamping arm.
8. The stepless retractable handle assembly for luggage as claimed
in claim 7, wherein said anchor clamp further comprises a first
friction member, a second friction member, a third friction member
and a fourth friction member, said first friction member being
mounted at an opposite end of the respective said first clamping
arm. and abutted against the inside wall of said outer tube of the
respective said retractable bar, said second friction member being
mounted at an opposite end of the respective said second clamping
arm and abutted against the inside wall of said outer tube of the
respective said retractable bar, said third friction member being
mounted at an opposite end of the respective said third clamping
arm and abutted against the inside wall of said outer tube of the
respective said retractable bar, said fourth friction member being
mounted at an opposite end of the respective said fourth clamping
arm and abutted against the inside wail of said outer tube of the
respective said retractable bar.
9. The stepless retractable handle assembly for luggage as claimed
in claim 8, wherein said first clamping arm comprises a first
spring groove extending around said first pivot hole of the
respective said first clamping arm; said second clamping arm
comprises a second spring groove extending around said second pivot
hole of the respective said second clamping arm; said third
clamping arm comprises a third spring groove extending around said
third pivot hole of the respective said third clamping arm; said
fourth clamping arm comprises a fourth spring groove extending
around said fourth pivot hole of the respective said fourth
clamping arm; said anchor clamp further comprises four torsion
springs, two said torsion springs being respectively mounted on two
opposite ends of the respective said first pivot pin and
respectively accommodated in said first spring groove in the
respective said first clamping arm and said second spring groove in
the respective said second clamping arm, the other said torsion
springs being respectively mounted on two opposite ends of the
respective said second pivot pin and respectively accommodated in
said third spring groove in the respective said third clamping arm
and said fourth spring groove in the respective said fourth
clamping arm.
10. The stepless retractable handle assembly for luggage as claimed
in claim 2, wherein said fixed holder frame of said anchor clamp
holder comprises a lower bearing wall; said movable holder frame
comprises an upper bearing wall; said second tetur device of each
said positioning unit is mounted between said lower bearing wail of
the respective said fixed holder frame and said upper bearing wall
of the respective said movable holder frame.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to luggage technology, and
more particularly, to a stepless retractable handle assembly for
luggage.
[0003] 2. Description of the Related Art
[0004] A luggage normally has rollers mounted at the bottom side
thereof, and a retractable handle mounted at the back side thereof.
By means of the rotation of the rollers and the draggable function
of the retractable handle, the carrying convenience of the luggage
is enhanced.
[0005] For enabling a luggage to be dragged with less effort,
conventional retractable handles are commonly made in a multi-stage
telescopic design. In the retractable handle adjustment process, it
needs the help of positioning pins, positioning steel balls or
other positioning structures to achieve the desired positioning
effect. However, these positioning structures likely to cause a
limitation in the adjustment process, making the user unable to
adjust the retractable handle to the most appropriate height
according to the actual needs. This will also affect the comfort of
the use of the retractable handle with luggage.
SUMMARY OF THE INVENTION
[0006] The present invention has been accomplished under the
circumstances in view. It is the main object of the present
invention to provide a stepless retractable handle assembly for
luggage, which is quite convenient in operation and allows
adjustment to any desired height without structural
limitations.
[0007] To achieve this and other objects of the present invention,
a stepless retractable handle assembly for luggage comprises a
handle grip, two retractable bars, a control unit, a transmission
unit, and two positioning units. The handle grip comprises a bottom
grip shell, and a top grip shell mounted on a top side of the
bottom grip shell. The top grip shell comprises a button slot. Each
retractable bar comprises an outer tube and an inner tube axially
slidably inserted into the outer tube. The inner tube has a top end
thereof fixedly connected to the bottom grip shell of the handle
grip, and thus, the two inner tubes can be carried by the handle
grip to move in the respective outer tubes up and down. The control
unit comprises a press-button and a first teturn device. The
press-button is vertically movably mounted in the button slot of
the top grip shell of the handle grip, comprising two first pushing
abutment portions located at a bottom side thereof. The first
teturn device is mounted between the bottom grip shell of the
handle grip and the press-button to impart an elastic restoring
force to the press-button. The transmission unit comprises two
transmission plates, two bearing blocks, and two connection shafts.
The two transmission plates are transversely movably mounted in the
bottom grip shell of the handle grip, each comprising two first
bearing portions located at one end thereof and respectively
abutted against the first pushing abutment portions of the
press-button and a second pushing abutment portion located at an
opposite end thereof. Thus, the two transmission plates can be
moved transversely when the press-button is pressed by an external
force. The two bearing blocks are respectively affixed to
respective top ends of the inner tubes of the retractable bars,
each comprising a second bearing portion abutted against the second
pushing abutment portion of one respective transmission plate. The
two connection shafts are respectively inserted into the inner
tubes of the retractable bars, and respectively connected to
respective bottom ends of the bearing blocks. Thus, the bearing
blocks are drivable to move the connected connection shafts
vertically. Each positioning unit is mounted in one respective
retractable bar, comprising an anchor clamp holder, an anchor clamp
and a second teturn device. The anchor clamp holder is mounted in
the inner tube of one respective retractable bar and connected to a
bottom end of one respective connection shaft for movement with the
inner tube of the respective retractable bar relative to the
associating outer tube. The anchor clamp is pivotally connected to
the anchor clamp holder and disposed in the outer tube of the
respective retractable bar and movable to abut against or release
from an inside wall of the outer tube of the respective retractable
bar subject to vertical displacement of the anchor clamp holder in
the respective retractable bar. The second return device is stopped
against the anchor clamp holder to impart an elastic restoring
forced to the anchor clamp holder. Thus, when pressed on the
press-button, the anchor clamps are released from the inside walls
of the outer tubes of the respective retractable bars for allowing
adjustment of the height of the inner tubes of the retractable
bars. When released the press-button, the anchor clamps are
extended out to abut against the inside walls of the outer tubes of
the respective retractable bars, locking the inner tubes of the
retractable bars in the adjusted position.
[0008] Preferably, the movable holder frame of the anchor clamp
holder comprises a first lateral hole and a second lateral hole;
the anchor clamp comprises a first clamping arm and a second
clamping arm. The first clamping arm comprises a first transverse
guide hole located in one end thereof, and a first pivot hole
disposed adjacent to the first transverse guide hole. The second
clamping arm comprises a second transverse guide hole located in
one end thereof, and a second pivot hole disposed adjacent to the
second transverse guide hole. Each positioning unit further
comprises a first pivot bolt and a second pivot bolt. The first
pivot bolt is inserted through the first lateral hole of the
respective movable holder frame and the first transverse guide hole
of the respective first clamping arm. The second pivot bolt is
inserted through the second lateral hole of the respective movable
holder frame and the second transverse guide hole of the respective
second clamping arm. Thus, the first and second clamping arms of
the anchor clamp can be biased to abut against or release from the
inside wall of the outer tube of the respective retractable bar
when the respective movable holder frame is moved vertically.
[0009] Preferably, each positioning unit further comprises a
supplementary anchor clamp pivotally connected the bottom end of
the respective movable holder frame below the associating anchor
clamp. Thus, the supplementary anchor clamp can be biased to abut
against or release from the inside wall of the outer tube of the
respective retractable bar when the associating movable holder
frame is moved vertically, enhancing the functioning of the
respective positioning unit to lock the inner tube of the
respective retractable bar.
[0010] Other advantages and features of the present invention will
be fully understood by reference to the following specification in
conjunction with the accompanying drawings, in which like reference
signs denote like components of structure.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] FIG. 1 is an oblique top elevational view of a stepless
retractable handle assembly for luggage in accordance with a first
embodiment of the present invention.
[0012] FIG. 2 is a partial exploded view of the stepless
retractable handle assembly for luggage in accordance with the
first embodiment of the present invention.
[0013] FIG. 3 is another partial exploded view of the stepless
retractable handle assembly for luggage in accordance with the
first embodiment of the present invention.
[0014] FIG. 4 is an exploded view of one positioning unit of the
stepless retractable handle assembly for luggage in accordance with
the first embodiment of the present invention.
[0015] FIG. 5 is a sectional view of a part of the first embodiment
of the present invention, illustrating the internal arrangement of
the handle grip before pressing of the press-button.
[0016] FIG. 6 is similar to FIG. 5, illustrating the press-button
pressed.
[0017] FIG. 7 is a sectional view of a part of the first embodiment
of the present invention, illustrating the anchor clamp and the
supplementary anchor clamp abutted against the inside wall of the
outer tube of the associating retractable bar.
[0018] FIG. 8 is similar to FIG. 7, illustrating the anchor clamp
and the supplementary anchor clamp released from the inside wall of
the outer tube of the associating retractable bar.
[0019] FIG. 9 is similar to FIG. 1, illustrating the height of the
inner tubes of the retractable bars adjusted.
[0020] FIG. 10 is a sectional view of one retractable bar of a
stepless retractable handle assembly for luggage in accordance with
a second embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[0021] Referring to FIGS. 1, 2, 3 and 5, a stepless retractable
handle assembly 10 for luggage in accordance with a first
embodiment of the present invention is shown. The c stepless
retractable handle assembly 10 comprises a handle grip 20, two
retractable bars 30, a control unit 40, a transmission unit 50, and
two positioning units 60.
[0022] The handle grip 20 comprises a bottom grip shell 21, and a
top grip shell 22 affixed to a top side of the bottom grip shell
21. The top grip shell 22 defines therein a button slot 23.
[0023] Each retractable bar 30 comprises an outer tube 31, and an
inner tube 32 slidably axially inserted into the outer tube 31. As
shown in FIG. 3 and FIG. 5, the outer tube 31 has a bottom end
thereof affixed to a luggage (not shown), and an opposing top end
thereof affixed to the bottom grip shell 21 of the handle grip 20.
Thus, the inner tube 32 is movable with the handle grip 20 up and
down relative to the outer tube 31.
[0024] The control unit 40 comprises a press-button 41 and a first.
teturn device 42. As illustrated in FIG. 2 and FIG. 5, the
press-button 41 is mounted in the button slot 23 of the top grip
shell 22 of the handle grip 20. Further, the press-button 41. has
two first pushing abutment portions 43 spaced at a bottom side
thereof. The first teturn device 42 (for example, compression
spring) is mounted between the bottom grip shell 21 and the
press-button 41, and adapted to provide an upward elastic restoring
force to the press-button 41.
[0025] Referring to FIGS. 2 and 5 again, the transmission unit 50
comprises two transmission plates 51, two bearing blocks 52, and
two connection shafts 53. The two transmission plates 51 are
symmetrically mounted in the bottom grip shell 21 of the handle
grip 20 at two opposite sides, each having one end thereof provided
with two spaced first bearing portions 54 respectively abutted
against the first pushing abutment portions 43 of the press-button
41 of the control unit 40 and an opposite end thereof provided with
a second pushing abutment portion 55. The bearing blocks 52 are
respectively fixedly mounted at respective top ends of the inner
tubes 32 of the retractable bars 30, each comprising a second
bearing portion 56 abutted against the second pushing abutment
portion 55 of the second pushing abutment portion 55 of one
respective transmission plate 51. The connection shafts 53 are
respectively inserted into the inner tubes 32 of the retractable
bars 30, each having a top end thereof fixedly connected to a
bottom side of one respective bearing block 52.
[0026] Referring to FIG. 4 and FIG. 3 again, each positioning unit
60 comprises an anchor clamp holder 61, an anchor clamp 62, and a
second teturn device 63. The anchor clamp holder 61 comprises a
fixed holder frame 64 and a movable holder frame 65. The fixed
holder frame 64 consists of a first frame half 66a and a second
frame half 66b. The first frame half 66a comprises a mounting hole
661 located in an upper part thereof. The second frame half 66b
comprises a lower bearing wall 663 located at an upper part
thereof. The first frame half 66a and the second frame half 66b are
assembled together by plugging the lower bearing wall 663 into the
mounting hole 661. Further, the first frame half 66a and the second
frame half 66b are affixed to a bottom end of the inner tube 32 of
one respective retractable bar 30 with a plug pin 67 that is
inserted into the lower bearing wall 663 of the second frame half
66b (see FIG. 7). Further, the two frame halves 66a;66b each have a
first locating hole 665 located in a lower part thereof and a
second locating hole 667 spaced below the first locating hole 665.
The movable holder frame 65 comprises an opening 651 located in an
upper part thereof, and an upper bearing wall 652 located in the
opening 651. The lower bearing wall 663 of the second frame half
66b is inserted through the opening 651 so that the movable holder
frame 65 is kept between the first arid second frame halves 66a;66b
of the fixed holder frame 64. The movable holder frame 65 further
comprises opposing first lateral hole 653 and second lateral hole
654 located in a lower part thereof, a first longitudinal sliding
slot 655 spaced between the first lateral hole 653 and the second
lateral hole 654, a third lateral hole 656 spaced below the first
lateral hole 653, a fourth lateral hole 657 spaced below the second
lateral hole 654, and a second longitudinal sliding slot 658 spaced
between the third lateral hole 656 and the fourth lateral hole
657.
[0027] The anchor clamp 62 comprises a first clamping arm 68. The
first clamping arm 68 comprises a first transverse guide hole 682
extended through two opposite lateral sides of one end thereof, and
a first pivot hole 684 disposed adjacent to the first transverse
guide hole 682. The first clawing arm 68 is pivotally connected to
a bottom end of the movable holder frame 65 with a first pivot bolt
70. The first pivot bolt 70 is inserted through the first lateral
hole 653 of the movable holder frame 65 and the first transverse
guide hole 682 of the first clamping arm 68. The anchor clamp 62
further comprises a second clamping arm 69. The second clamping arm
69 comprises a second transverse guide hole 692 extended through
two opposite lateral sides of one end thereof, and a second pivot
hole 694 disposed adjacent to the second transverse guide hole 692.
The second clamping arm 69 is pivotally connected to the bottom end
of the movable holder frame 65 with a second pivot bolt 71. The
second pivot bolt 71 is inserted through the second lateral hole
654 of the movable holder frame 65 and the second transverse guide
hole 692 of the second clamping arm 69. Further, the first clamping
arm 68 and the second clamping arm 69 are pivotally connected
together by a first pivot pin 72. The first pivot pin 72 is
inserted through the first locating hole 665 of the fixed holder
frame 64, the first pivot hole 684 of the first clamping arm 68,
the second pivot hole 694 of the second clamping arm 69 and the
first longitudinal sliding slot 655 of the movable holder frame 65.
The anchor clamp 62 further comprises a first friction member 73
and a second friction member 74. The first friction member 73 is
mounted at an opposite end of the first clamping arm 68. The second
friction member 74 is mounted at an opposite end of the second
clamping arm 69. The second teturn device 63 (for example,
compression spring) is mounted in the opening 651 of the movable
holder frame 65 and stopped between the lower bearing wall 663 of
the fixed holder frame 64 and the upper bearing wall 652 of the
movable holder frame 65 to impart an upward pressure to the movable
holder frame 65.
[0028] Each positioning unit 60 further comprises two first torsion
springs 75. The first torsion springs 75 are respectively mounted
on two opposite ends of the first pivot pin 72 and respectively
accommodated in a first spring groove 686 in the first clamping arm
68 and a second spring groove 696 in the second clamping arm 69.
The first spring groove 686 extends around the first pivot hole
684. The second spring groove 696 extends around the second pivot
hole 694. Thus, the first torsion springs 75 can simultaneously
impart an outward elastic restoring force to the first and second
clamping arm 68;69.
[0029] Each positioning unit 60 further comprises a supplementary
anchor clamp 80. The supplementary anchor clamp 80 comprises a
third clamping arm 81, a third friction member 77, a fourth
clamping arm 82, and a fourth friction member 78. The third
clamping arm 81 has a third pivot hole 812 extended through two
opposite lateral sides of one end thereof. The third friction
member 77 is mounted at an opposite end of the third clamping arm
81. The fourth clamping arm 82 has a fourth pivot hole 822 extended
through two opposite lateral sides of one end thereof. The fourth
friction member 78 is mounted at an opposite end of the fourth
clamping arm 82. The third clamping arm 81 and the fourth clamping
arm 82 are pivotally connected to the bottom end of the movable
holder frame 65 by a second pivot pin 79. The second pivot pin 79
is inserted through the second locating hole 667 of the fixed
holder frame 64, the third pivot hole 812 of the third clamping arm
81, the fourth pivot hole 822 of the fourth clamping arm 82 and the
second longitudinal sliding slot 658 of the movable holder frame
65. Each positioning unit 60 further comprises a third pivot bolt
83, a fourth pivot bolt 84, and two second torsion springs 76. The
third pivot bolt 83 is inserted into the third lateral hole 656 of
the movable holder frame 65 and stopped at the outer perimeter of
the third clamping arm 81. The fourth pivot bolt 84 is inserted
into the fourth lateral hole 657 of the movable holder frame 65 and
stopped at the outer perimeter of the fourth clamping arm 82. The
two second torsion springs 76 are respectively mounted on two
opposite ends of the second pivot pin 79 and respectively
accommodated in a third spring groove 814 in the third clamping arm
81 and a fourth spring groove 824 in the fourth clamping arm 82.
The third spring groove 814 extends around the third pivot hole
812. The fourth spring groove 824 extends around the fourth pivot
hole 822. Thus, the second torsion springs 76 can simultaneously
impart an outward elastic restoring force to the third and fourth
clamping arm 81;82.
[0030] Thus, when going to adjust the height of the retractable
bars 30, press on the press-button 41, as illustrated in FIG. 6. At
this time, the first pushing abutment portion 43 of the
press-button 41 is forced to push the first bearing portions 54 of
the transmission plates 51, moving the transmission plates 51
transversely in two reversed directions away from the press-button
41. During transverse movement of the transmission plates 51, the
second pushing abutment portions 55 of the transmission plates 51
will be forced to push the second bearing portions 56 of the
respective hearing blocks 52, moving the bearing blocks 52 and the
respective connection shafts 53 downwards. During downward movement
of the connection shafts 53, the connected movable holder frames 65
are lowered with the respective connection shafts 53, as shown in
FIG. 8. When the movable holder frames 65 are being lowered, the
first and second pivot bolts 70;71 are respectively forced to
downwardly move the hole wall of the first transverse guide hole
682 of the first clamping arm 68 and the hole wall of the second
transverse guide hole 692 of the second clamping arm 69, causing
the first and second clamping arms 68;69 of the anchor clamp 62 of
each positioning unit 60 to turn about the associating first pivot
pin 72. At this time, the first and second friction members 73;74
of the anchor clamp 62 of each positioning unit 60 are moved away
from the inside wall of the outer tube 31 of the associating
retractable bar 30. On the other hand, during downward movement of
the movable holder frames 65, the respective third and fourth pivot
bolts 83;84 are forced to downwardly move the respective third
clamping arms 81 and the respective fourth clamping arms 82,
causing the third and fourth clamping arms 81;82 of the
supplementary anchor clamp 80 to inwardly turn about the pivot pin
79, as shown in FIG. 8. At this time, the third and fourth friction
members 77;78 are moved away from the inside wall of the outer tube
31 of the associating retractable bar 30. Thus, as shown in FIG. 9,
the user can pull the handle grip 20 to move the inner tubes 32 of
the retractable bars 30 relative to the respective outer tubes 31,
thereby adjusting the retractable bars 30 to the desired
height.
[0031] After the retractable bars 30 are adjusted to the desired
height, release the pressure from the press-button 41, allowing the
press-button 41 to be returned to its former position by the
elastic restoring force of the first teturn device 42, as shown in
FIG. 5. After the press-button 41 returned to its former position,
the transmission plates 51 are released from the pressure of the
press-button 41. At this time, the movable holder frames 65 are
moved upwards by the respective second teturn devices 63. During
upward movement of the movable holder frames 65, the connection
shafts 53 are carried upwards by the respective movable holder
frames 65. During upward movement of the connection shafts 53, the
respective bearing blocks 52 arc forced to move the respective
transmission plates 51, thereby returning the respective
transmission plates 51 to their former position. Further, during
upward movement of the movable holder frames 65, the respective
first and second pivot bolts 70;71 are released from the respective
first and second clamping arms 68;69, allowing the respective first
and second clamping arms 68;69 to be respectively forced outwards
by the respective first torsion springs 75 to abut the respective
first and second friction members 73;74 against the inside walls of
the outer tubes 31 of the respective retractable bars 30. At the
same time, the respective third and fourth pivot bolts 83;84 are
released from the associating third and fourth clamping arms 81;82,
allowing the respective third and fourth clamping arms 81;82 to be
respectively forced outwards by the respective second torsion
springs 76 to abut the respective third and fourth friction members
77;78 against the inside walls of the outer tubes 31 of the
respective retractable bars 30, as shown in FIG. 7, thereby locking
the inner tubes 32 to the respective outer tubes 31.
[0032] It is to be noted that the supplementary anchor clamps 80
can be eliminated from the positioning units 60 according to actual
requirements. In this case, as started in FIG. 10, the second pivot
pins 79, the third pivot bolts 83 and the fourth pivot bolts 84 can
be eliminated from the positioning units 60 and, the third lateral
hole 656, the fourth lateral hole 657 and the second longitudinal
sliding slot 658 can be eliminated from each movable holder frame
65. The simplified positioning units 60 can still effectively let
the inner tubes 32 of the retractable bars 30 be conveniently
adjusted to the desired height in a stepless manner and then locked
in the adjusted position.
[0033] In conclusion, the stepless retractable handle assembly 10
of the present invention is quite convenient in operation. The most
important is the ability to meet the needs of different users for
adjustment to any desired height without structural limitations,
achieving the purpose of increasing user comfort.
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