EXPANDABLE CHAIR ASSEMBLY
A chair assembly has a seat, a backrest and an expandable leg supporting device. The seat has a front end and a rear end. The backrest is connected to the rear end of the seat. The expandable leg supporting device is mounted on the front end of the seat and has a base, at least one extension frame and a frame driving device. The base is mounted securely on the front end of the seat. The least one extension frame is connected to the base. The frame driving device is mounted on the base and is connected to the at least one extension frame to pivot the at least one extension frame relative to the base. Accordingly, the chair assembly can be expanded to support legs of a user in an expanded condition.
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1. Field of the Invention
The present invention relates to a chair, and more particularly to an expandable chair assembly to support legs of a user in an expanded condition.
2. Description of Related Art
Chairs enable person sitting thereon to support the weights of the sitter. A chair substantially comprises a seat and a backrest for support the back of a sitter. The backrest may be adjustable in angle relative to the seat to fit with different needs of different sitters.
However, when a person sits on a chair for a long time, for example in a long vehicle traveling, the legs of the sitter on the convention chair will become tired, numb or pained due to long term of bending. Accordingly, the conventional chair should be further improved to provide an enhanced comforting effect.
To overcome the shortcomings, the present invention tends to provide an extendable chair assembly to mitigate or obviate the aforementioned problems.
SUMMARY OF THE INVENTIONThe main objective of the invention is to provide an expandable chair assembly to support legs of a user in an expanded condition. The chair assembly has a seat, a backrest and an expandable leg supporting device. The seat has a front end and a rear end. The backrest is connected to the rear end of the seat. The expandable leg supporting device is mounted on the front end of the seat and has a base, at least one extension frame and a frame driving device. The base is mounted securely on the front end of the seat. The least one extension frame is connected to the base. The frame driving device is mounted on the base and is connected to the at least one extension frame to pivot the at least one extension frame relative to the base.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
With reference to
The expandable leg supporting device 30 is mounted on the front end of the seat 10 and comprises a base 31, at least one extension frame 33,33A,33B and a frame driving device 32. The base 31 is mounted securely on the front end of the seat 10. The at least one extension frame 33,33A,33B is connected to the base 31. Preferably, three extension frames 33,33A,33B are implemented, are telescopically connected with each other and include an outer extension frame 33, a middle extension frame 33A and an inner extension frame 33B arranged from outside to inside in sequence. Each extension frame 33,33A,33B has a volume gradually increasing from the inner extension frame 33B to the outer extension frame 33, such that a smaller extension frame 33A,33B is mounted in a large extension frame 33,33A. In addition, each extension frame 33,33A,33B has two side panels 332,332A,332B, a rear panel 331,331A,331B and an opened front panel. Each side panel 332,332A,332B has an inner surface facing to each other and an outer surface opposite to each other. The rear panel 331 of the outer extension frame 33 is connected pivotally to the base 31.
The frame driving device 32 is mounted on the base 31 and is connected to the at least one extension frame 33,33A,33B to pivot the at least one extension frame 33,33A,33B relative to the base 31. With further reference to
With further reference to
The middle extension frame 33A has an inner extension driving device 333A comprises an inner motor 334A, an inner threaded rod 335A and an inner nut 336A. The inner motor 334A is mounted securely on the rear panel 331A of the middle extension frame 33A. The inner threaded rod 335A is connected to and driven by the inner motor 334A. The inner nut 336A is mounted rotatably around the inner threaded rod 335A and is connected securely to the rear panel 331B of the inner extension frame 33B.
In addition, the outer extension frame 33 has two rails 337 mounted respectively on the inner surfaces of the side panels 332. The middle extension frame 33A has two sliders 338A and two rails 337A. The sliders 338A are mounted respectively on the outer surfaces of the side panels 332A of the middle extension frame 33A and are slidably connected with the rails 337 on the outer extension frame 33. The rails 338A are mounted respectively on the inner surfaces of the side panels 332A of the middle extension frame 33A. The inner extension frame 33B has two sliders 338B mounted respectively on the outer surfaces of the side panels 332B of the inner extension frame 33B and slidably connected with the rails 337A on the middle extension frame 33A.
With further reference to
With reference to
In addition, an inner detecting device may be mounted between the middle extension frame 33A and the inner extension frame 33B and may have the same components as that of the middle detecting device 40.
To expand the leg supporting device 30, with reference to
With reference to
Similarly, with reference to
With reference to
With reference to
With reference to
Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Claims
1. A chair assembly comprising:
- a seat having a front end and a rear end;
- a backrest connected to the rear end of the seat; and
- an expandable leg supporting device mounted on the front end of the seat and comprising a base mounted securely on the front end of the seat; at least one extension frame connected to the base; and a frame driving device mounted on the base and connected to the at least one extension frame to pivot the at least one extension frame relative to the base.
2. The chair assembly as claimed in claim 1, wherein the frame driving device comprises
- a driving motor;
- a worn rod connected to and driven by the driving motor;
- a worn gear engaging and driven by the worn rod;
- a pinion co-axially mounted on the worn gear;
- a driving gear engaging the pinion; and
- a pivotal rod co-axially mounted on and protruding from the driving gear and connected securely to the at least one extension frame.
3. The chair assembly as claimed in claim 2, wherein
- the expandable leg supporting device has three extension frames telescopically connected with each other and including an outer extension frame, a middle extension frame and an inner extension frame arranged from outside to inside in sequence;
- each extension frame has a volume gradually increasing from the inner extension frame to the outer extension frame; and
- the outer extension frame is connected securely with the pivotal rod of the frame driving device.
4. The chair assembly as claimed in claim 3, wherein
- the outer extension frame has a middle extension driving device comprising a middle motor mounted securely on the outer extension frame; a middle threaded rod connected to and driven by the middle motor; and a middle nut mounted rotatably around the middle threaded rod and connected securely to the middle extension frame; and
- the middle extension frame has an inner extension driving device comprising an inner motor mounted securely on the middle extension frame; an inner threaded rod connected to and driven by the inner motor; and an inner nut mounted rotatably around the inner threaded rod and connected securely to the inner extension frame.
5. The chair assembly as claimed in claim 3, wherein
- the outer extension frame has two side panels each having an inner surface facing to each other; and two rails mounted respectively on the inner surfaces of the side panels;
- the middle extension frame has two side panels each having an inner surface facing to each other and an outer surface opposite to each other; two sliders mounted respectively on the outer surfaces of the side panels of the middle extension frame and slidably connected with the rails on the outer extension frame; two rails mounted respectively on the inner surfaces of the side panels of the middle extension frame; and
- the inner extension frame has two side panels each having an outer surface opposite to each other; two sliders mounted respectively on the outer surfaces of the side panels of the inner extension frame and slidably connected with the rails on the middle extension frame.
6. The chair assembly as claimed in claim 5, wherein the expandable leg supporting device further has a foot supporting panel pivotally connected to the inner extension frame.
7. The chair assembly as claimed in claim 6, wherein
- the inner extension frame further has a panel driving device mounted on the inner extension frame, connected to the foot supporting panel and having a panel driving motor mounted on the inner extension frame; a driving pulley connected to and driven by the panel driving motor; a driven pulley mounted rotatably on the inner extension frame; a belt mounted endlessly around the driving pulley and the driven pulley; and a pivotal axle co-axially formed on and protruding from the driven pulley; and
- the foot supporting panel has two ends and two pivotal ears formed respectively on the ends of the foot supporting panel, wherein one of the pivotal ears is connected securely with the pivotal axle of the panel driving device and the other pivotal ear is connected pivotally to the inner extension frame with a pivot.
8. The chair assembly as claimed in claim 7, wherein the expandable leg supporting device further has a middle detecting device mounted between the outer extension frame and the middle extension frame and comprising
- a potentiometer mounted on the middle extension frame;
- a detecting gear connected to the potentiometer;
- a rod mount mounted securely on the middle extension frame;
- a rotatable rod mounted rotatably on the rod mount and having two ends respectively protruding out from two sides of the rod mount;
- a first end gear and a second end gear mounted respectively on the ends of the rotatable rod, wherein the first end gear engages the detecting gear; and
- a rack mounted securely on the outer extension frame and engaging the second end gear.
9. The chair assembly as claimed in claim 8, wherein the expandable leg supporting device further has an inner detecting device mounted between the middle extension frame and the inner extension frame and has a same components as that of the middle detecting device.
10. The chair assembly as claimed in claim 4, wherein
- the outer extension frame has two side panels each having an inner surface facing to each other; and two rails mounted respectively on the inner surfaces of the side panels;
- the middle extension frame has two side panels each having an inner surface facing to each other and an outer surface opposite to each other; two sliders mounted respectively on the outer surfaces of the side panels of the middle extension frame and slidably connected with the rails on the outer extension frame; two rails mounted respectively on the inner surfaces of the side panels of the middle extension frame; and
- the inner extension frame has two side panels each having an outer surface opposite to each other; two sliders mounted respectively on the outer surfaces of the side panels of the inner extension frame and slidably connected with the rails on the middle extension frame.
11. The chair assembly as claimed in claim 10, wherein the expandable leg supporting device further has a foot supporting panel pivotally connected to the inner extension frame.
12. The chair assembly as claimed in claim 11, wherein
- the inner extension frame further has a panel driving device mounted on the inner extension frame, connected to the foot supporting panel and having a panel driving motor mounted on the inner extension frame; a driving pulley connected to and driven by the panel driving motor; a driven pulley mounted rotatably on the inner extension frame; a belt mounted endlessly around the driving pulley and the driven pulley; and a pivotal axle co-axially formed on and protruding from the driven pulley; and
- the foot supporting panel has two ends and two pivotal ears formed respectively on the ends of the foot supporting panel, wherein one of the pivotal ears is connected securely with the pivotal axle of the panel driving device and the other pivotal ear is connected pivotally to the inner extension frame with a pivot.
13. The chair assembly as claimed in claim 12, wherein the expandable leg supporting device further has a middle detecting device mounted between the outer extension frame and the middle extension frame and comprising
- a potentiometer mounted on the middle extension frame;
- a detecting gear connected to the potentiometer;
- a rod mount mounted securely on the middle extension frame;
- a rotatable rod mounted rotatably on the rod mount and having two ends respectively protruding out from two sides of the rod mount;
- a first end gear and a second end gear mounted respectively on the ends of the rotatable rod, wherein the first end gear engages the detecting gear; and
- a rack mounted securely on the outer extension frame and engaging the second end gear.
14. The chair assembly as claimed in claim 13, wherein the expandable leg supporting device further has an inner detecting device mounted between the middle extension frame and the inner extension frame and has a same components as that of the middle detecting device.
15. The chair assembly as claimed in claim 3, wherein the expandable leg supporting device further has a foot supporting panel pivotally connected to the inner extension frame.
16. The chair assembly as claimed in claim 15, wherein
- the inner extension frame further has a panel driving device mounted on the inner extension frame, connected to the foot supporting panel and having a panel driving motor mounted on the inner extension frame; a driving pulley connected to and driven by the panel driving motor; a driven pulley mounted rotatably on the inner extension frame; a belt mounted endlessly around the driving pulley and the driven pulley; and a pivotal axle co-axially formed on and protruding from the driven pulley; and
- the foot supporting panel has two ends and two pivotal ears formed respectively on the ends of the foot supporting panel, wherein one of the pivotal ears is connected securely with the pivotal axle of the panel driving device and the other pivotal ear is connected pivotally to the inner extension frame with a pivot.
17. The chair assembly as claimed in claim 16, wherein the expandable leg supporting device further has a middle detecting device mounted between the outer extension frame and the middle extension frame and comprising
- a potentiometer mounted on the middle extension frame;
- a detecting gear connected to the potentiometer;
- a rod mount mounted securely on the middle extension frame;
- a rotatable rod mounted rotatably on the rod mount and having two ends respectively protruding out from two sides of the rod mount;
- a first end gear and a second end gear mounted respectively on the ends of the rotatable rod, wherein the first end gear engages the detecting gear; and
- a rack mounted securely on the outer extension frame and engaging the second end gear.
18. The chair assembly as claimed in claim 17, wherein the expandable leg supporting device further has an inner detecting device mounted between the middle extension frame and the inner extension frame and has a same components as that of the middle detecting device.
19. The chair assembly as claimed in claim 3, wherein the expandable leg supporting device further has a middle detecting device mounted between the outer extension frame and the middle extension frame and comprising
- a potentiometer mounted on the middle extension frame;
- a detecting gear connected to the potentiometer;
- a rod mount mounted securely on the middle extension frame;
- a rotatable rod mounted rotatably on the rod mount and having two ends respectively protruding out from two sides of the rod mount;
- a first end gear and a second end gear mounted respectively on the ends of the rotatable rod, wherein the first end gear engages the detecting gear; and
- a rack mounted securely on the outer extension frame and engaging the second end gear.
20. The chair assembly as claimed in claim 3, wherein the expandable leg supporting device further has an inner detecting device mounted between the middle extension frame and the inner extension frame.
Type: Application
Filed: Jul 1, 2011
Publication Date: Apr 19, 2012
Applicant: (TAIPEI CITY)
Inventors: CHIN-CHEN CHANG (TAIPEI CITY), QING-KUN YIN (GUANGDONG)
Application Number: 13/174,931
International Classification: A47C 7/50 (20060101);