U.S. patent application number 12/837827 was filed with the patent office on 2012-01-19 for chair for a drummer.
Invention is credited to Kuo-Chang CHEN.
Application Number | 20120013162 12/837827 |
Document ID | / |
Family ID | 45466379 |
Filed Date | 2012-01-19 |
United States Patent
Application |
20120013162 |
Kind Code |
A1 |
CHEN; Kuo-Chang |
January 19, 2012 |
CHAIR FOR A DRUMMER
Abstract
A chair for a drummer of the present invention is
height-adjustable, thus the chair is suitable for users with
different body sizes. The chair can be fastened by pivoting a
swaying member rather than screwing a threaded element. As such,
the chair is durable and the chair can be easily operated.
Inventors: |
CHEN; Kuo-Chang; (Taichung
City, TW) |
Family ID: |
45466379 |
Appl. No.: |
12/837827 |
Filed: |
July 16, 2010 |
Current U.S.
Class: |
297/311 |
Current CPC
Class: |
A47C 9/08 20130101 |
Class at
Publication: |
297/311 |
International
Class: |
A47C 3/28 20060101
A47C003/28 |
Claims
1. A chair for a drummer, comprising: a main rod, having a top end,
a threaded section and a bottom end, the threaded section
connecting the top end to the bottom end; a pad, disposed on the
top end, the pad being adapted for a drummer to sit thereon; a
first sleeve, having an inner surface, a through hole being defined
in the inner surface, the main rod being received in the first
sleeve, the first sleeve having three first pivoting portions, each
first pivoting portion defining a first pivoting axial, each first
pivoting axial being perpendicular to the longitudinal direction of
the main rod; a fixation element, comprising a clamping portion, a
linking rod, an axial rod, a threaded piece and a swaying member,
the clamping portion being disposed on the first sleeve in a
rotational operative relationship, the clamping portion having a
threaded clamping surface, a penetrating hole being defined in the
clamping surface, the penetrating hole and the through hole being
coaxial, the main rod being received in the penetrating hole, the
penetrating hole mating with the threaded section, the clamping
portion having a first abutting portion and a second abutting
portion, an opening being defined between the first abutting
portion and the second abutting portion, the opening extending from
one end of the clamping portion to the other end of the clamping
portion, the opening communicating with the penetrating hole and
the surrounding, the first abutting portion being formed with a
first axial hole, the second abutting portion being formed with a
second axial hole, the axial holes being coaxial, the linking rod
being received in the axial holes, the axial rod being
perpendicularly disposed on one end of the linking rod, the
threaded piece being screwed on the other end of the linking rod,
the swaying member being disposed between the axial rod and the
first abutting portion, the swaying member being rotatable about
the axial rod, the abutting portions being located between the
threaded piece and the swaying member, the swaying member having an
arcuate surface facing the first abutting portion, a first pressing
point, a second pressing point and a third pressing point being
defined on the arcuate surface, the second pressing point being
located between the first pressing point and the third pressing
point, each pressing point defining a pressing distance, each
pressing distance being a distance between the axial rod and its
corresponding pressing point, the pressing distance of the second
pressing point being greater than the pressing distances of the
others, the pressing distance of the third pressing point being
greater than the pressing distance of the first pressing point; a
tube, firmly disposed on the first sleeve, the bottom end being
received in the tube; a second sleeve, the tube being slidably
received in the second sleeve, the second sleeve having three
second pivoting portions, each second pivoting portion defining a
second pivoting axial, each second pivoting axial being
perpendicular to the longitudinal direction of the main rod; three
racks, comprising a supporting pole and a linkage, each supporting
pole being rotatably disposed on one of the first pivoting portions
about its corresponding first pivoting axial, each linkage having a
first end and a second end, each first end being rotatably disposed
on one of the second pivoting portions about its corresponding
second pivoting axial, each second end being rotatably disposed on
one of the supporting poles.
2. The chair of claim 1, wherein a radial direction is defined
perpendicular to the main rod, the width along the radial direction
of each axial hole is greater than the diameter of the linking
rod.
3. The chair of claim 2, wherein the first abutting portion is
formed with an abutting groove, the abutting groove is located on a
surface which is located away from the second abutting portion, the
arcuate surface abuts against the abutting groove.
4. The chair of claim 3, wherein the first abutting portion is
formed with a slant surface in the first axial hole, the slant
surface is located away from the main rod, the first axial hole has
two ends, the first axial hole is enlarged gradually from one end
which is near to the second axial hole to the other end.
5. The chair of claim 1, wherein the inner surface is threaded.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a chair, more particularly
to a drummer's chair.
[0003] 2. Description of the Prior Art
[0004] Drummer's chairs are provided for drummers. These chairs are
usually height-adjustable, just as the chair shown in U.S. Pat. No.
5,738,326. The chair mainly includes a threaded stem and a clamping
device. The clamping device surrounds the threaded stem. The
clamping device may secure the threaded stem with a screw and a
nut. To avoid sliding of the threaded stem, users usually firmly
secure the nut with a very strong force. The force may probably
destroy the thread of the screw or the nut, especially when the
height of the chair has been adjusted for many times. Thus, the
life time of the chair is limited.
[0005] The present invention is, therefore, arisen to obviate or at
least mitigate the above mentioned disadvantages.
SUMMARY OF THE INVENTION
[0006] The main object of the present invention is to provide a
chair, which is height-adjustable and durable.
[0007] To achieve the above and other objects, a chair for a
drummer of the present invention includes a main rod, a pad, a
first sleeve, a fixation element, a tube, a second sleeve and three
racks.
[0008] The main rod has a top end, a threaded section and a bottom
end. The threaded section connects the top end to the bottom end.
The pad is disposed on the top end. The pad is adapted for a
drummer to sit thereon. The first sleeve has an inner surface. A
through hole is defined in the inner surface. The main rod is
received in the first sleeve. The first sleeve has three first
pivoting portions. Each first pivoting portion defines a first
pivoting axial. Each first pivoting axial is perpendicular to the
longitudinal direction of the main rod. The fixation element
comprises a clamping portion, a linking rod, an axial rod, a
threaded piece and a swaying member. The clamping portion is
disposed on the first sleeve in a rotational operative
relationship. The clamping portion has a threaded clamping surface.
A penetrating hole is defined in the clamping surface. The
penetrating hole and the through hole are coaxial. The main rod is
received in the penetrating hole. The penetrating hole mates with
the threaded section. The clamping portion has a first abutting
portion and a second abutting portion. An opening is defined
between the first abutting portion and the second abutting portion.
The opening extends from one end of the clamping portion to the
other end of the clamping portion. The opening communicates with
the penetrating hole and the surrounding. The first abutting
portion is formed with a first axial hole. The second abutting
portion is formed with a second axial hole. The axial holes are
coaxial. The linking rod is received in the axial holes. The axial
rod is perpendicularly disposed on one end of the linking rod. The
threaded piece is screwed on the other end of the linking rod. The
swaying member is disposed between the axial rod and the first
abutting portion. The swaying member is rotatable about the axial
rod. The abutting portions are located between the threaded piece
and the swaying member. The swaying member has an arcuate surface
facing the first abutting portion. A first pressing point, a second
pressing point and a third pressing point are defined on the
arcuate surface. The second pressing point is located between the
first pressing point and the third pressing point. Each pressing
point defines a pressing distance. Each pressing distance is a
distance between the axial rod and its corresponding pressing
point. The pressing distance of the second pressing point is
greater than the pressing distances of the others. The pressing
distance of the third pressing point is greater than the pressing
distance of the first pressing point. The tube is firmly disposed
on the first sleeve. The bottom end being received in the tube. The
tube is slidably received in the second sleeve. The second sleeve
has three second pivoting portions. Each second pivoting portion
defines a second pivoting axial. Each second pivoting axial is
perpendicular to the longitudinal direction of the main rod. Each
rack comprises a supporting pole and a linkage. Each supporting
pole is rotatably disposed on one of the first pivoting portions
about its corresponding first pivoting axial. Each linkage has a
first end and a second end. Each first end is rotatably disposed on
one of the second pivoting portions about its corresponding second
pivoting axial. Each second end is rotatably disposed on one of the
supporting poles.
[0009] The present invention will become more obvious from the
following description when taken in connection with the
accompanying drawings, which show, for purpose of illustrations
only, the preferred embodiment(s) in accordance with the present
invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] FIG. 1 is a combination drawing showing a chair of the
present invention;
[0011] FIG. 2 is a combination drawing showing a chair of the
present invention;
[0012] FIG. 3 is a partial breakdown drawing showing a chair of the
present invention;
[0013] FIG. 4 is a breakdown drawing showing a fixation element of
the present invention;
[0014] FIG. 4A is a profile showing a clamping portion of the
present invention;
[0015] FIG. 4B is a stereogram showing a swaying member of the
present invention;
[0016] FIG. 5 is a profile showing a main rod and a fixation
element of the present invention;
[0017] FIG. 6 is a profile showing a main rod and a fixation
element of the present invention;
[0018] FIG. 7 is a profile showing a main rod and a fixation
element of the present invention;
[0019] FIG. 8 is a profile showing a main rod and a fixation
element of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0020] Please refer to FIG. 1 to FIG. 4 for a first embodiment of
the present invention. The chair for a drummer to sitting thereon
of the present embodiment is foldable and height-adjustable. The
chair includes a main rod 1, a pad 2, a first sleeve 3, a fixation
element 4, a tube 5, a second sleeve 6 and three racks 7.
[0021] The main rod 1 has a top end 11, a threaded section 12 and a
bottom end 13. The top end 11 is adapted for a pad to be disposed
thereon. The threaded section 12 connects the top end 11 to the
bottom end 13. A radial direction is defined perpendicular to the
main rod 1.
[0022] The pad 2 is disposed on the top end 11. The pad 2 may be
disposed on the top end 11 in a rotational operative relationship.
The pad 2 is adapted for a drummer to sit there on.
[0023] The first sleeve 3 has an inner surface 31. A through hole
is defined in the inner surface 31. The main rod 1 is received in
the first sleeve 3. The inner surface may be threaded for the
threaded section 12 to mate therewith. The first sleeve 3 is formed
with three first pivoting holes 33. Three first pivoting portions
32 are received in the first pivoting holes 33 respectively. Each
first pivoting portion 32 may be a bolt or a rivet. Each first
pivoting portion 32 defines a first pivoting axial in its
longitudinal direction which is perpendicular to the longitudinal
direction of the main rod 1. In other possible embodiments of the
invention, the first pivoting portions 32 may be formed on the
first sleeve 3 directly.
[0024] The fixation element 4 includes a clamping portion 41, a
linking rod 42, an axial rod 43, a swaying member 44 and a threaded
piece 45. The fixation element 4 may further include a spring 46.
The clamping portion 41 is disposed on the first sleeve 3 in a
rotational operative relationship. Preferably, the clamping portion
41 may be directly formed on the first sleeve 3. The clamping
portion 41 has a threaded clamping surface 411. A penetrating hole
is defined in the clamping surface 411. The main rod 1 is received
in the penetrating hole, so that the penetrating hole and the
through hole are coaxial. The penetrating hole mates with the
threaded section 12. The clamping portion 41 has a first abutting
portion 413 and a second abutting portion 414. An opening 412 is
defined between the first abutting portion 413 and the second
abutting portion 414. The opening 412 extends from one end of the
clamping portion 41 to the other end of the clamping portion 41.
The opening communicates with the penetrating hole and the
surrounding. The first abutting portion 413 is formed with a first
axial hole 415. The second abutting portion 414 is formed with a
second axial hole 416. The first axial hole 415 and the second
axial hole 416 are coaxial. The first axial hole 415 and the second
axial hole 416 are perpendicular to the longitudinal direction of
the main rod 1. The first abutting portion 413 is formed with a
slant surface 417 in the first axial hole 415, as shown in FIG. 4A.
The slant surface 417 is located away from the main rod 1. The
first axial hole 415 has two ends. The first axial hole is enlarged
gradually from the end which is near to the second axial hole to
the other end. The second axial hole 416 has a large diameter
section 4161 and a small diameter section 4162. The small diameter
section 4162 is located between the large diameter section 4161 and
the first abutting portion 413. The second abutting portion 414 has
a step surface 418 between the large diameter section 4161 and the
small diameter section 4162. The first abutting portion 413 may be
formed with an abutting groove 419. The abutting groove 419 is
located on the surface which is located away from the second
abutting portion 414. The longitudinal direction of the abutting
groove 419 may be parallel to the longitudinal direction of the
main rod 1. Preferably, the abutting groove 419 can be a cylinder
surface.
[0025] The linking rod 42 is received in both of the axial holes
415, 416. The width along the radial direction of each axial hole
is greater than the diameter of the linking rod 42, so that the
linking rod 42 is movable along the radial direction. The axial rod
43 is perpendicularly disposed on one end 421 of the linking rod
42. The threaded piece 45 is screwed on the other end 422 of the
linking rod 42.
[0026] The swaying member 44 is disposed between the axial rod 43
and the first abutting portion 413, so that the abutting portions
413, 414 are located between the swaying member 44 and the threaded
piece 45. The swaying member 44 is rotatable about the axial rod
43. The swaying member 44 has an arcuate surface 441 facing the
first abutting portion 413, as shown in FIG. 4B. The arcuate
surface 441 abuts against the abutting groove 419. Preferably, the
arcuate surface 441 can be a cylinder surface.
[0027] The distance between the axial rod 43 and the arcuate
surface 441 is not uniform. Thus, a first pressing point, a second
pressing point and a third pressing point can be defined on the
arcuate surface 441. Each pressing point defines a pressing
distance between itself and the axial rod 43. The second pressing
point is located between the first pressing point and the third
pressing point. The pressing distance of the second pressing point
is greater than the pressing distances of the others. The pressing
distance of the third pressing point is greater than the pressing
distance of the first pressing point.
[0028] The spring 46 is disposed between the threaded piece 45 and
the second abutting portion 414. Preferably, the spring 46 may be
received in the large diameter section 4161, and may abut against
the step surface 418.
[0029] The tube 5 is firmly disposed on the first sleeve 3. The
bottom end 13 is received in the tube 5. The main rod 1 is slidable
and rotatable with respect to the tube 5. The tube 5 may include a
stretching section 51 and a stopping section 52. The stretching
section 51 connects the first sleeve 3 to the stopping section 52.
The outer diameter of the stopping section 52 is greater than the
outer diameter of the stretching section 51.
[0030] The tube 5 is slidably received in the second sleeve 6. More
specifically, the stretching section 51 is slidably received in the
second sleeve 6. The stopping section 52 can block the second
sleeve 6, so that the second sleeve 6 can not depart from the tube
5. The second sleeve 6 is formed with three second pivoting holes
62. Three second pivoting portions 61 are received in the second
pivoting holes 62 respectively. Each second pivoting portion 61 may
be a bolt or a rivet. Each second pivoting portion 61 defines a
second pivoting axial in its longitudinal direction which is
perpendicular to the longitudinal direction of the main rod 1. In
other possible embodiments of the invention, the second pivoting
portions 61 may be formed on the second sleeve 6 directly. The
second sleeve 6 and the tube 5 may be secured by a screw 63, so
that the position of the second sleeve 6 is adjustable.
[0031] Each rack 7 includes a supporting pole 71 and a linkage 72.
Each supporting pole 71 is disposed on one of the first pivoting
portions 32. Each supporting pole 71 is rotatable about its
corresponding first pivoting axial. Each linkage 72 has a first end
721 and a second end 722. Each first end 721 is disposed on one of
the second pivoting portions 61. Each first end 721 is rotatable
about its corresponding second pivoting axial. Each second end 722
is rotatably disposed on one of the supporting poles 71.
[0032] Accordingly, the chair can be folded by moving the second
sleeve 6. Also, the height of the pad 2 is adjustable. The swaying
member 44 and the threaded piece 45 can be release, as shown in
FIG. 5. The main rod 1 is not clamped by the clamping portion 41,
so the distance between the top end 11 and the first sleeve 3 is
changeable. After the distance is determined, the threaded piece 45
is softly secured, and the swaying member 44 is moved to a first
position, as shown in FIG. 6. At the same time, the first pressing
point abuts against the first abutting portion 413. The swaying
member 44 can be moved to a second position, as shown in FIG. 7.
The second pressing point abuts against the first abutting portion
413. The pressing distance of the second pressing point is greater
than the same of the first pressing point. Thus, the swaying member
44 presses the first abutting portion 413. The clamping portion 41
clamps the main rod 1 to prevent the main rod 1 from rotating or
sliding. The swaying member 44 can be kept moving to a third
position, as shown in FIG. 8. The third pressing point abuts
against the first abutting portion 413. The pressing distance of
the third pressing point is greater than the pressing distance of
the first pressing point, but smaller than the pressing distance of
the second pressing point. As such, the swaying member 44 can still
press the first abutting portion 413. The swaying member 44 can not
move to the second position or the first position without a
pull.
[0033] To conclude, the chair can be secured by rotating the
swaying member 44 rather than screwing a threaded element.
* * * * *