U.S. patent application number 11/709659 was filed with the patent office on 2008-08-28 for lifting and lowering structure of a long-legged chair.
Invention is credited to Pao-Hsien Cheng.
Application Number | 20080203779 11/709659 |
Document ID | / |
Family ID | 39715037 |
Filed Date | 2008-08-28 |
United States Patent
Application |
20080203779 |
Kind Code |
A1 |
Cheng; Pao-Hsien |
August 28, 2008 |
Lifting and lowering structure of a long-legged chair
Abstract
A long-legged chair includes a pair of seat supporting members,
which are each connected to a respective one of front legs of the
chair so as to slide up and down on the front legs; each seat
supporting member has a hollow protruding portion thereon, which
has a hole facing and adjacent to a corresponding front leg, and
which has a button received therein and pivoted thereto; each
button has a pressed portion and an inserted portion passed through
a corresponding said hole so as to be received in one of the
recessed portions in order for the seat supporting members to be
firmly held by the front legs; when the buttons are pressed at the
pressed portions, the inserted portions will be out of the recessed
portions of the front legs, and in turn the seat supporting members
are allow to slide on the front legs to adjust height.
Inventors: |
Cheng; Pao-Hsien; (Jen Te
Hsiang, TW) |
Correspondence
Address: |
ROSENBERG, KLEIN & LEE
3458 ELLICOTT CENTER DRIVE-SUITE 101
ELLICOTT CITY
MD
21043
US
|
Family ID: |
39715037 |
Appl. No.: |
11/709659 |
Filed: |
February 23, 2007 |
Current U.S.
Class: |
297/171 |
Current CPC
Class: |
A47D 1/002 20130101;
A47D 1/004 20130101 |
Class at
Publication: |
297/171 |
International
Class: |
A47B 1/08 20060101
A47B001/08 |
Claims
1. A lifting and lowering structure of a long-legged chair,
comprising a pair of front legs, the front legs each having a
plurality of recessed portions thereof; a pair of rear legs pivoted
to respective ones the front legs, a pair of seat supporting
members, the seat supporting members being each connected to a
respective one of the front legs so as to slide over the front
legs; and a seat joined to the seat supporting members, each of the
seat supporting members having a hollow protruding portion thereon;
each of the hollow protruding portions having a hole adjacent to a
corresponding said front leg; each of the hollow protruding
portions having a button received therein and pivoted thereto; each
of the buttons having a pressed portion and an inserted portion;
the inserted portions of the buttons each facing a corresponding
said hollow protruding portion hole so as to be passed through said
hole and received in one of the recessed portions of the front legs
in order for the seat supporting members to be firmly held in
position on the front legs; an angle between each of the pressed
portions of the buttons and a corresponding said inserted portion
being blunt; the buttons being capable of being pressed at the
pressed portions to move the inserted portions out of the recessed
portions of the front legs in order to allow the seat supporting
members to slide on the front legs.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a lifting and lowering
structure of a long-legged chair, more particularly one, which is
relatively easy to operate for adjusting the height of the
seat.
[0003] 2. Brief Description of the Prior Art
[0004] Babies and little children don't have enough height or
ability to act independent therefore adults sometimes have to seat
babies and little children in long-legged chairs. Most of such
chairs can be folded with front and rear legs thereof being close
together to be easy to store and carry. And, because little
children grow taller very rapidly, such chairs should be equipped
with height-adjustable seats for suiting little children at
different ages.
[0005] Referring to FIGS. 7 and 8, a currently existing long-legged
chair includes a pair of front legs 91, a pair of rear legs 92 each
pivoted to a respective one of the front legs 91, a pair of seat
supporting members 93, and a seat 94 joined to the seat supporting
members 93. The seat supporting members 93 are each fitted on a
respective one of the front legs 91 so as to slide over the front
legs 91. The seat 94 can be joined to the seat supporting members
93 by any fastening means that allows the seat 94 to be easily
fitted to/separated from the seat supporting members 93.
Furthermore, the seat supporting members 93 each have a knob 95
fitted thereon, which includes a handle part 951, and a bolt part
952 with outer threads. And, the front legs 91 have several
securing holes 911 thereon, which allow the bolt parts 952 of the
knobs 95 to be passed into so as to secure the seat supporting
members 93 after the seat supporting members 93 are adjusted to a
proper height.
[0006] The above structure has a disadvantage: the knobs 95 have to
be passed into the securing holes 911 and turned after the seat
supporting members 93 have been adjusted. Consequently, it takes
relatively much time and labor to operate such a long-legged
chair.
SUMMARY OF THE INVENTION
[0007] Therefore, it is a main object of the present invention to
provide an improvement on a lifting and lowering structure of a
long-legged chair, which is easy to operate.
[0008] A lifting and lowering structure of a long-legged chair
according to an embodiment of the present invention includes a pair
of seat supporting members, which are each connected to a
respective one of front legs of the chair so as to slide up and
down over the front legs; each seat supporting member has a hollow
protruding portion thereon, which has a hole facing and adjacent to
a corresponding front leg, and a button received therein and
pivoted thereto. Each button has a pressed portion and an inserted
portion passed through a corresponding said hole so as to be
received in one of the recessed portions in order for the seat
supporting members to be firmly held on the front legs.
Furthermore, angle between each button pressed portion and a
corresponding inserted portion is blunt; thus, downward force
exerted on the seat supporting members will be passed on to the
font legs to increase the moment of force, thus making the buttons
further passed into and tightly pressed against the recessed
portions. When the buttons are pressed at the pressed portions, the
inserted portions will be out of the recessed portions of the front
legs, and in turn height of the seat supporting members can be
adjusted.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The present invention will be better understood by referring
to the accompanying drawings, wherein:
[0010] FIG. 1 is a perspective view of the present invention,
[0011] FIG. 2 is a fragmentary exploded perspective view of the
present invention,
[0012] FIG. 3 is a side view of the present invention,
[0013] FIG. 4 is a sectional view of the present invention, taken
when the button is partly received in one recessed portion,
[0014] FIG. 5 is a sectional view of the present invention, taken
when the button is apart from the recessed portions,
[0015] FIG. 6 is a side view of the present invention, taken after
the seat is adjusted in height,
[0016] FIG. 7 is a perspective view of the prior art, and
[0017] FIG. 8 is a partial sectional view of the prior art.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0018] Referring to FIGS. 1 to FIGS. 6, a preferred embodiment of a
long-legged chair of the present invention includes a pair of front
legs 1, a pair of rear legs 2, a pair of seat supporting members 3,
a seat 4, and casters 5.
[0019] The front legs 1 each have several recessed portions 12
spaced apart on a first side thereof. The rear legs 2 are pivoted
to respective ones of the front legs 1. The seat supporting members
3 are each connected to a respective one of the front legs 1 so as
to slide over the corresponding front leg 1. The seat 4 is joined
to the seat supporting members 3 in a separable manner. The front
legs 1 are further coupled with a transverse rod 11 so as to be
secured together. The rear legs 2 are coupled with a transverse rod
21 so as to be secured together. The casters 5 are each connected
to a respective one of the front and the rear legs 1 and 2.
[0020] The seat supporting members 3 each includes a lateral plank
part 31, and a sliding sleeve 32 securely joined to the lateral
plank part 31. Furthermore, the seat supporting members 3 are
coupled and secured together with a transverse rod 311, which will
help support the seat 4 when the seat 4 is supported by the seat
supporting members 3. The sliding sleeves 32 are positioned around
the corresponding front legs 1 so that the seat supporting members
3 can slide up and down along the front legs 1 together. Armrests
33 are fitted to respective ones of the lateral plank parts 31 of
the seat supporting members 3. The lateral plank parts 31 is made
so as to allow the seat 4 to be easily fitted thereto and easily
separated therefrom.
[0021] The seat supporting members 3 each have a hollow protruding
portion 61. And, the hollow protruding portions 61 each have a
button 62 received therein and pivoted thereto, and a hole 611
facing the first side of the corresponding front leg 1, on which
the recessed portions 12 are formed. The buttons 62 each have a
pressed portion 621, and an inserted portion 622 below the pressed
portion 621 and facing the hole 611 of the corresponding hollow
protruding portion 61, and are each pivoted at a proper portion
thereof to the corresponding hollow protruding portion 61 by means
of a pin 63, which can be a rivet; the pressed portions 621 of the
buttons 62 are rectangular flat plate-shaped, and have saw teeth
shaped portions 6211 for slip-prevention. The buttons 62 are each
biased by means of an elastic element 64, which is interposed
between an inward side of its pressed portion 621 and an inner side
of the hollow protruding part 61, such that the buttons 62 are each
received in one of the recessed portions 12 of a corresponding
front leg 1 at the inserted portion 622 thereof so as to hold the
seat supporting members 3 in position.
[0022] An angle between each one of the pressed portions 621 and
the corresponding inserted portion 622 is blunt. Referring to FIG.
4, the elastic elements 64 will provide a moment of force so as to
make the inserted portions 622 of the buttons 62 further pass into
the recessed portions 12 of the front legs 1 after the inserted
portions 622 are received in the recessed portions 12. Furthermore,
downward force exerted on the seat supporting members 3 will be
passed on to the font legs 1 to increase the moment of force, thus
making the buttons 62 further passed into and tightly pressed
against the recessed portions 12 of the front legs 1 so as to make
the seat supporting members 3 firm on the front legs 1.
[0023] Referring to FIGS. 5 and 6, the seat supporting members 3
will be adjustable in height after the pressed portions 621 of the
buttons 62 are pressed in order for the inserted portions 622 to be
out of the recessed portions 12 of the font legs 1; after the seat
supporting members 3 are lifted/lowered to next recessed portions
12, the buttons 62 will be automatically inserted into the recessed
portions 12 of the front legs 1 again to make the seat supporting
members 3 firm on the front legs 1.
* * * * *