CHASSIS OF SWIVEL CHAIR

• US 20160192782A1
• Filed: 09/04/2014
• Published: 07/07/2016
• Est. Priority Date: 09/24/2013
• Status: Active Grant

• Current Assignee: UE Furniture Co., Ltd.
• Original Assignee: UE Furniture Co., Ltd.
• Inventors: HE, JI, RUAN, ZHENGFU
• Granted Patent: US 10,178,913 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A47C 1/03255 with a central column, e.g. rocking office chairs
• CPC Class Codes: A47C 1/03272 with coil springs
• CPC Class Codes: A47C 1/03274 of torsion type
• CPC Class Codes: A47C 1/03294 slidingly movable in the base frame, e.g. by rollers
• CPC Class Codes: A47C 3/18 Chairs or stools with rotatable seat adjustable in height by rotation A47C3/24
• CPC Class Codes: A47C 7/44 with elastically-mounted back-rest or backrest-seat unit in the base frame
• CPC Class Codes: A47C 7/443 with coil springs

Abstract

A gravity self-adapted chassis of chair has the first plug pin, second plug pin, third plug pin, forth plug pin, tilting plate, first connecting rod, and the second connecting rod of the chassis form into a four-point connecting rod mechanism so as to form the conduction of the force, the backrest is fixedly connected with the tilting plate to offer the driving force of the four-point connecting rod mechanism, the gravity applied onto the seat by the users forms into the reset force applied onto the four-point connecting rod mechanism through the third plug pin hinged with the bracket, and the driving force and the reset force of the four-point connecting rod mechanism form into the confrontation relationship.

Claims

1. A chassis of a swivel chair, characterized by comprising:

a base connected with an air rod, a bracket used for fixing a seat and a tilting plate connected with the backrest, wherein the bracket is arranged within the base, the tilting plate is arranged within the bracket, the middle of the tilting plate is provided with a first pin shaft which is taken as the rotating fulcrum thereof, the first pin shaft penetrates through the bracket and is connected with the base, a first connecting rod and a second connecting rod are symmetrically arranged at two sides at the front part of the tilting plate, one end of the first connecting rod is hinged with the front end of the tilting plate through a fourth pin shaft, the other end of the first connecting rod is hinged with one end of the second rod through a third pin shaft, the third pin shaft is connected with the bracket, the other end of the second connecting rod is provided with a second pin shaft in a penetrating way, the second pin shaft is connected with the base after penetrating though or avoiding the bracket, track grooves which are matched with the first pin shaft and used for guiding the motion trail of the bracket are symmetrically arranged at two sides of the bracket, the first pin shaft is arranged within the track grooves in a penetrating way, and the chassis further comprises an elastic reset device which leads the bracket to be capable of resetting after the bracket is titled by the tilting plate to move.

2. The chassis of the swivel chair according to claim 1, characterized in that:

hollow grooves which are matched with the second pin shaft and used for avoiding the second pin shaft when the bracket moves are symmetrically arranged at two sides of the bracket, and the second pin shaft is arranged within the hollow grooves in a penetrating way.

3. The chassis of the swivel chair according to claim 1, characterized in that:

the part of the two sides of the bracket, which interferes the second pin shaft, is cut, so that the bracket avoids the second pin shaft.

4. The chassis of the swivel chair according to claim 1, characterized in that:

the first pin shaft is an integrated long shaft, and two ends of the first pin shaft are connected with the base after respectively penetrating through the tilting plate and the track groove in sequence, or

the first pin shaft is two independent short shafts, two stands are fixedly arranged on the base correspondingly, one end of each short shaft is connected with the base after penetrating through the tilting plate and the track groove in sequence, and the other end of each shaft is inserted into the corresponding stand.

6. The chassis of the swivel chair according to claim 2, characterized in that:

the second pin shaft is an integrated long shaft, and two ends of the second pin shaft are connected with the base after respectively penetrating through the second connecting rod and the hollow grooves in sequence;

or

the second pin shaft is two independent small shafts, two supports are fixedly arranged on the base correspondingly, one end of each short shaft is connected with the base after penetrating through the second connecting rod and the hollow grooves in sequence, and the other end of each shaft is inserted into the corresponding support.

7. The chassis of the swivel chair according to claim 3, characterized in that:

the second pin shaft is an integrated long shaft, and two ends of the second pin shaft are connected with the base after penetrating through the second connecting rod respectively;

or

the second pin shaft is two independent small shafts, two supports are fixedly arranged on the base correspondingly, one end of each small shaft is connected with the base after penetrating through the second connecting rod, and the other end of each small shaft is inserted into the corresponding support.

10. The chassis of the swivel chair according to claim 1, characterized in that:

the connection between the first pin shaft and the base means that;

first pin holes are symmetrically arranged at two sides of the back end of the base, and the first pin shaft is inserted into the first pin holes;

the connection between the second pin shaft and the base means that;

second pin holes are symmetrically arranged at two ends of the frond end of the base, and the second pin shaft is inserted into the second pin holes; and

the connection between the third pin shaft and the base means that;

the third pin shaft is inserted into the bracket. The third pin shaft can be used for driving the bracket to synchronously move.

13. The chassis of the swivel chair according to claim 1, characterized in that:

the base comprises a base plate connected with an air rod, two support plates are respectively arranged at the left side and the right side of the base plate along with the vertical direction, the support plates are fixedly connected with the base plate, and the first pin shaft and the second pin shaft are connected with the support plates of the base;

the bracket comprises two basal plates which are in parallel with each other at intervals and arranged along with the vertical direction, the basal plates are adhered to the support plates, the upper ends of the basal plates are bent to form a supporting plate used for being connected with the seat, a connecting plate is fixedly connected between the two basal plates, and the tilting plate is arranged between the two basal plates.

14. The chassis of the swivel chair according to claim 1, characterized in that:

the first connecting rod is arranged in a tilting way towards the direction which is near to the tilting plate from bottom to top, the second rod is arranged in a tilting way towards the direction which departs from the tilting plate from bottom to top, and when the bracket moves, the inclined angle between the second connecting rod and the plumb line is always not more than 90 degrees.

15. The chassis of the swivel chair according to claim 2, characterized in that:

the track grooves and the hollow grooves are all arranged in a tilting way towards the direction which is near to the tilting plate from bottom to top.

16. The chassis of the swivel chair according to claim 1, characterized in that:

the chassis is further provided with a backrest tilting plate locking mechanism, wherein the backrest tilting plate locking mechanism comprises a row of lock holes symmetrically arranged on the two sides of the tilting plate as well as two torsion springs a, two plug pins and two plug pin bases, which are symmetrically arranged at the two sides within the base;

the plug pin bases are fixedly arranged on the base, the plug pins are inserted onto the plug pin bases in a sliding way and are matched with the lock holes, first spring arms of the torsion springs a are connected with the plug pins, and second spring arms of the torsion springs a are connected with a drive device used for driving the torsion springs a to rotate to and fro.

17. The chassis of the swivel chair according to claim 16, characterized in that:

the drive device comprises a crank, a positioning base and a stirring rod, wherein the positioning base is fixedly connected with the base, the positioning base is arc and is hollow in the inner part, the upper end within the positioning base is provided with an arc lug boss which downwards extends, the lug boss is configured to divide the upper end in the positioning base into two positioning grooves, the positioning base is internally provided with a fixture block, the upper end of the fixture block is clamped within the positioning grooves, two ends of the crank are connected with the second spring arms of the two torsion springs a, the crank is connected with the fixture block through a rocker, one end of the stirring rod is fixedly connected with the fixture block after penetrating through the base, and the other end of the stirring rod exposes out of the base;

the stirring rod is stirred forward and backward, so that the fixture block moves from one positioning groove into another positioning groove, and the fixture block rotates to drive the crank move, therefore, the two torsion springs a are driven to rotate, and under the action of the elasticity of the torsion springs a, the first spring arms drive the plug pins inserted into the corresponding lock holes or withdrawn out of the lock holes to realize the lock and the unlock of the plug pins.

18. The chassis of the swivel chair according to claim 17, characterized in that:

the drive device further comprises two stand columns for installing the torsion springs a, the upper end of each stand column is provided with a screw in a screwing way, the torsion springs a are arranged onto the screws in a covering way, the lower end of each stand column is fixedly connected with the base through an arc bridge, a shaft hole is formed between each arc bridge and the bottom surface of the base, and the stirring rod penetrates through one of the arc bridges to be connected with the fixture block.

19. The chassis of the swivel chair according to claim 1, characterized in that:

the bracket is connected with the elastic reset device, the elastic reset device is a spring, one end of the spring is connected with the bracket, and the other end of the spring is connected with the base.

25. The chassis of the swivel chair according to claim 1, characterized in that:

the fourth pin shaft is an integrated long shaft, and two ends of the fourth pin shaft are respectively connected with one end of the first connecting rod and the front end of the tilting plate.

26. The chassis of the swivel chair according to claim 1, characterized in that:

the fourth pin shaft is connected with the elastic reset device, the elastic reset device is a spring, one end of the spring is connected with the fourth pin shaft, and the other end of the spring hooks the base.

29. The chassis of the swivel chair according to claim 25, characterized in that:

the chassis is further provided with a backrest tilting plate locking mechanism, wherein the backrest tilting plate locking mechanism comprises a lock plate, a torsion spring a, a plug pin and a plug pin base, a row of lock holes are arranged on the lock plate, the lock plate is fixedly connected with the forth plug pin and moves synchronously with the forth plug pin under the action of the tilting plate, the plug pin base is arranged beside the lock plate and is fixedly connected with the base, the plug pin is inserted onto the plug pin base in a sliding way and is matched with the lock holes, a first spring arm of the torsion spring a is connected with the plug pin, and a second spring arm of the torsion spring a is connected with a drive device used for driving the torsion spring a to rotate back and force.

31. The chassis of the swivel chair according to claim 29, characterized in that:

the drive device comprises a support base, a stirring rod and a positioning ring which is deformable after being forced, wherein the support base is fixedly arranged on the plug pin base, the positioning ring is fixedly arranged on the support base, the torsion spring a is covered on a screw, the screw is fixedly arranged on the support base, the positioning ring is internally provided with a kidney-shaped hole, an arc lug boss is arranged in the middle of the kidney-shaped hole, the poisoning ring is internally divided into two clamp grooves due to the configuration of the lug boss, one end of the stirring rod extends into the positioning ring after penetrating through the base, and the other end of the stirring rod exposes out of the base;

a second spring arm of the torsion spring a is connected with the end of the stirring rod, which extends into the positioning ring, and the stirring rod is stirred, so that the end of the stirring end, which extends into the poisoning ring, moves into the other clamp groove from one clamp groove, and the torsion spring a is driven to rotate, under the elasticity action of the torsion spring a, the first spring arm pulls the plug pin to be inserted into the corresponding lock holes or withdrawn out of the lock holes, therefore, the plug pin can be locked and unlocked.

33. The chassis of the swivel chair according to claim 29, characterized in that:

the plane where the lock plate is arranged is perpendicular to the axis of the forth plug pin;

the upper end face and the lower end face of the lock plate are concaved to form grooves which are matched with the plug pin in a leaning wav, and the plug pin outwards extends and is clamped within the grooves of the upper end face and the lower end face, so that the tilting plate can be locked at the initial angle and the maximum angle.

35. The chassis of the swivel chair according to claim 29, characterized in that:

a plastic sleeve is covered onto the forth plug pin, the intercrossed position between the plastic sleeve and the extension section is cut off to form a gap, and the extension section is properly clamped within the gap.

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