U.S. patent application number 13/612868 was filed with the patent office on 2014-03-13 for adjustable structure for the footrest ring of a chair.
The applicant listed for this patent is YU MING YEH. Invention is credited to YU MING YEH.
Application Number | 20140070592 13/612868 |
Document ID | / |
Family ID | 50232535 |
Filed Date | 2014-03-13 |
United States Patent
Application |
20140070592 |
Kind Code |
A1 |
YEH; YU MING |
March 13, 2014 |
ADJUSTABLE STRUCTURE FOR THE FOOTREST RING OF A CHAIR
Abstract
An adjustable structure for the footrest ring of a chair
includes a footrest ring, a sleeve, a nut, an adjusting rod and two
retaining rings. The sleeve is received in a through hole of a
fixed base of the footrest ring, having a wall cut with an oblique
groove. The nut is secured in an insert hole of the fixed base of
the footrest ring. The adjusting rod has one end screwed in the nut
and another end extending out of the fixed base. The two retaining
rings are respectively engaged in the engage groove at an upper and
a lower outer wall of the sleeve. Thus, the footrest ring can
conveniently be adjusted in height and stably positioned on the
support tube of a chair.
Inventors: |
YEH; YU MING; (Tainan,
TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
YEH; YU MING |
Tainan |
|
TW |
|
|
Family ID: |
50232535 |
Appl. No.: |
13/612868 |
Filed: |
September 13, 2012 |
Current U.S.
Class: |
297/423.38 |
Current CPC
Class: |
A47C 7/5064 20180801;
A47C 7/506 20130101; A47C 7/004 20130101 |
Class at
Publication: |
297/423.38 |
International
Class: |
A47C 7/50 20060101
A47C007/50 |
Claims
1. An adjustably structure for the footrest ring of a chair
comprising: a footrest ring provided with a fixed base, said fixed
base bored with a through hole in the interior, said through hole
having an inner wall disposed with a notch, said fixed base having
a wall bored with an insert hole, said insert hole communicating
with said notch; a sleeve received in said through hole of said
fixed base of said footrest ring, said sleeve having an upper and a
lower outer wall respectively formed with an engage groove, said
sleeve further having a wall cut with an oblique groove; a nut
secured in said insert hole of said fixed base of said footrest
ring, said nut having one end provided with a stop edge, said stop
edge fixed in said notch of said fixed base, said nut bored with an
insert hole in the interior, said insert hole formed with female
threads on the inner wall; an adjusting rod having one end
threadably fixed in the interior of said nut and another end
extending out of said fixed base of said footrest ring, said
adjusting rod having one end formed with male threads; and two
retaining rings respectively engaged in said engage groove at the
upper and the lower outer wall of said sleeve.
2. The adjustable structure for the footrest ring of a chair as
claimed in claim 1, wherein said through hole of said fixed base of
said footrest ring is formed with a recessed face at the topside
for receiving one of said two retaining rings.
3. The adjustable structure for the footrest ring of a chair as
claimed in claim 1, wherein said fixed base of said footrest ring
has outer wall set with a plurality of connecting ribs spaced apart
equidistantly.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] This invention relates to an adjustable structure for the
footrest ring of a chair, particularly to one able to adjust the
footrest ring to be positioned at a required height on the support
tube of a chair by turning an adjusting rod to resist against or
disengage from a sleeve that is secured on the support tube of the
chair.
[0003] 2. Description of the Prior Art
[0004] A comparatively high chair is generally provided with a
footrest ring on a support tube so that a sitter can comfortably
rest his/her feet thereon. A conventional footrest ring is
immovably fixed on the support tube of a chair; therefore, the
conventional footrest ring cannot be adjusted in height in
accordance with the length of a sitter's feet, rendering
inconvenience in use. Another conventional footrest ring adjustable
in position is to have an intermediate portion of the footrest ring
bored with a fitting hole for fitting the footrest ring on the
support tube of a chair. The fitting hole of the footrest ring has
one sidewall threadably fixed therein with a turning knob to be
turned tight to resist against the support tube or released from
the support tube for adjusting the footrest ring to be positioned
at a certain height on the support tube of a chair. However, the
conventional footrest ring adjustable in position is only to have
the inner end of the turning knob resisting against the outer wall
of the support tube of the chair so their contact area is quite
small and hence unable to stably position the footrest ring on the
support tube of the chair and as a result, the footrest ring fails
to be tightly constricted on the support tube and is liable to slip
off.
SUMMARY OF THE INVENTION
[0005] The objective of this invention is to offer an adjustable
structure for the footrest ring of a chair, able to adjust the
footrest ring to be stably positioned at a required height on the
support tube of a chair.
[0006] The adjustable structure for the footrest ring of a chair in
the present invention includes a footrest ring, a sleeve, a nut, an
adjusting rod and two retaining rings. The footrest ring is
provided with a fixed base formed therein with a through hole
having an inner wall disposed with a notch and having a wall bored
with an insert hole communicating with the notch. The sleeve to be
received in the through hole of the fixed base has an upper and a
lower outer wall respectively formed with an engage groove, further
having a wall cut with an oblique groove. The nut secured in the
insert hole of the fixed base has one end provided with a stop edge
to be set in the notch of the fixed base and its interior bored
with a lengthwise insert hole that is formed with female threads on
the inner wall. The adjusting rod has one end provided with male
threads and threadably fixed in the interior of the nut and another
end extending out of the fixed base of the footrest ring. The two
retaining rings are respectively engaged in the engage groove at
the upper and the lower outer wall of the sleeve.
[0007] Further, the through hole of the fixed base of the footrest
ring has its topside formed with a recessed face for receiving one
of the two retaining rings. Thus, retained and held by the two
retaining rings, the sleeve can be stably positioned in the
interior of the fixed base of the footrest ring.
BRIEF DESCRIPTION OF DRAWINGS
[0008] This invention will be better understood by referring to the
accompanying drawings, wherein:
[0009] FIG. 1 is an exploded perspective view of an adjustable
structure for the footrest ring of a chair in the present
invention;
[0010] FIG. 2 is a perspective view of the adjustable structure for
the footrest ring of a chair in the present invention;
[0011] FIG. 3 is a cross-sectional view of the adjustable structure
for the footrest ring of a chair in the present invention;
[0012] FIG. 4 is a schematic view of the adjustable structure for
the footrest ring of a chair, illustrating that an adjusting rod is
turned inward to resist against the outer wall of a sleeve and
fixed in position in the present invention; and
[0013] FIG. 5 is a schematic view of the adjustable structure for
the footrest ring of a chair, illustrating that the adjusting rod
is turned outward to disengage from the outer wall of the sleeve
for facilitating adjustment of the footrest ring in the present
invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0014] A preferred embodiment of an adjustable structure for the
footrest ring of a chair in the present invention, as shown in
FIGS. 1-4, includes a footrest ring 1, a sleeve 2, a nut 3, an
adjusting rod 4 and two retaining rings 5, 5' as main components
combined together.
[0015] The footrest ring 1 has a central portion provided with a
fixed base 10 with an axial through hole 11, which has a topside
formed with a recessed face 12 and an inner wall disposed with a
notch 13. The fixed base 10 has a sidewall bored with an insert
hole 14 communicating with the notch 13 and its outer wall set with
a plurality of connecting ribs 15 spaced apart equidistantly.
[0016] The sleeve 2 to be received in the through hole 11 of the
fixed base 10 of the footrest ring 1 has an upper and a lower outer
wall respectively provided with an engage groove 20, 20' and a
sidewall cut with an oblique groove 21.
[0017] The nut 3 inserted in the insert hole 14 of the fixed base
10 of the footrest ring 1 has one end provided with a stop edge 30
to be fixed in the notch 13 of the fixed base 10 and an interior
bored with an insert hole 31 provided with female threads 32 on the
inner wall.
[0018] The adjusting rod 4 has one end formed with male threads 40
and threadably fixed in the nut 3 and another end extending out of
the fixed base 10 of the footrest ring 1.
[0019] The two retaining rings 5, 5' are respectively engaged in
the engage groove 20 and 20' at the upper and the lower outer wall
of the sleeve 2.
[0020] In assembling, referring to FIGS. 1-4, firstly, set the nut
3 in the notch 13 of the fixed base 10 of the footrest ring 1 to
have the nut 3 inserted in the insert hole 14 of the fixed base 10
and the stop edge 30 of the nut 3 fixed in the notch 13 of the
fixed base 10. Next, secure the nut 3 in the insert hole 14 of the
fixed base 10 in a way of soldering and then, position the sleeve 2
in the through hole 11 of the fixed base 10 and have the two
retaining rings 5, 5' respectively engaged in the engage groove 20
and 20' at the upper and the lower outer wall of the sleeve 2,
letting the two retaining rings 5 and 5' respectively resisting on
the recessed face 12 of the fixed base 10 and on the underside of
the fixed base 10 and enabling the sleeve 2 to be secured in the
fixed base 10 of the footrest ring 1 never to slip off.
Subsequently, have one end of the adjusting rod 4, which is formed
with male threads 40, inserted in the insert hole of the nut 3 to
be screwed with the female threads 32 of the nut 3, thus finishing
assembly of the adjustable footrest ring of a chair.
[0021] In using, referring to FIGS. 2-5, after the adjustable
footrest ring 1 of this invention is assembled on the support tube
6 of a chair, as shown in FIG. 3, the sleeve 2 will be elastically
expanded outward by means of the oblique cut groove 21, and when
the adjusting rod 4 is turned clockwise and screwed in the interior
of the nut 3, the inner end of the adjusting rod 4 will push
against the outer wall of the sleeve 2 to make the sleeve 2
contracted elastically, as shown in FIGS. 3 and 4. At this time,
the space of the oblique cut groove 21 of the sleeve 2 will become
smaller and smaller to enable the inner wall of the sleeve 2 to
fully and closely contact with the outer wall of the support tube 6
of a chair, able to enlarge contact area and increase frictional
force between the sleeve 2 and the support tube 6. Thus, the
footrest ring 1 can be stably positioned on the support tube 6 of a
chair and impossible to become loosened and slip off. To adjust the
footrest ring 1 to be positioned at a proper height on the support
tube 6 of a chair, only turn the adjusting rod 4 counterclockwise
and unscrew it toward the outer side of the nut 3, letting the
inner end of the adjusting rod 4 no longer resist against the outer
wall of the sleeve 2 to enable the sleeve 2 to recover its
elasticity and expand outward, as shown in FIG. 5. Thus, the inner
wall of the sleeve 2 will no longer closely contact with the
support tube 6 of the chair and the footrest ring 1 can be adjusted
in height on the support tube 6. After the footrest ring 1 is
adjusted to a height required, the adjusting rod 4 is turned
clockwise anew to have its inner end resisting against the outer
wall of the sleeve 2 to make the sleeve 2 tightly constricted and
positioned on the support tube 6 of the chair, convenient to adjust
the footrest ring in height and able to stably position the
footrest ring.
[0022] While the preferred embodiment of the invention has been
described above, it will be recognized and understood that various
modifications may be made therein and the appended claims are
intended to cover all such modifications that may fall within the
spirit and scope of the invention.
* * * * *