CN112773122B - Rotary positioning mechanism, armrest frame with rotatable armrest seat and chair - Google Patents

Abstract

A rotary positioning mechanism, a rotatable armrest frame of an armrest seat and a chair are provided, wherein the rotary positioning mechanism is suitable for being installed on an armrest of the chair, and the armrest of the chair is provided with a supporting rod and an armrest seat which can rotate relative to the supporting rod. The rotary positioning mechanism comprises a fixed unit and a rotating unit. The fixing unit comprises a fixing plate, an elastic ring piece and a joint block. The fixing plate is provided with two arc grooves. The elastic ring piece is arranged between the arc grooves and provided with a plurality of arc concave parts. The joint block is formed with a plurality of joint concave surfaces. The rotating unit rotates along with the armrest seat and comprises a linkage plate and a pushing piece. The linkage plate is provided with two rotating posts which extend to the arc grooves respectively, and each rotating post is used for being in friction joint with one arc concave part. The pushing piece can be elastically and pushed to be jointed with one of the concave joint surfaces. The armrest seat is rotatable, and the armrest frame and the chair comprise the rotary positioning mechanism.

Description

Rotary positioning mechanism, armrest frame with rotatable armrest seat and chair

Technical Field

The present invention relates to a chair, and more particularly, to a rotatable armrest frame and a chair with a rotatable positioning mechanism and an armrest seat.

Background

The rotary armchair can horizontally rotate and adjust the armrest position according to the body action, is beneficial to keeping the correct body posture, lightens the hand pressure, accords with the ergonomics and can improve the comfort level of sitting for a long time.

Referring to fig. 1 and 2, a multi-functional chair armrest assembly, for example, U.S. patent application publication No. 20080073965A1, includes a rotating member 12 mounted inside an armrest 11 and rotating with the armrest 11, and a retainer 13 received in the rotating member 12 and fixedly coupled to an armrest support (not shown). The rotating member 12 has a chamber 120 penetrating the top and bottom for the holder 13 to be placed, and a plurality of teeth 121 located at two opposite sides and communicating with the chamber 120. The retainer 13 has a notch 131 located at two opposite sides and connected to the chamber 120, and two positioning posts 132 respectively arranged at the notch 131 in a resiliently pushing manner, and the fixing effect is achieved by a screw 14 penetrating through the retainer 13 and the armrest support. Each positioning post 132 is propped against one of the teeth 121, so that one of the teeth 121 is in frictional engagement with the respective positioning post 132. The user can rotate the rotating member 12 relative to the retainer 13 by using the rotation force of the armrest 11 greater than the friction force between the positioning posts 132 and the corresponding teeth 121, and engage the other teeth 121 with the respective positioning posts 132 to achieve the adjustment function of rotating and positioning the armrest 11.

Although the multi-purpose armrest assembly has the above-mentioned use characteristics, if the force of the user moving the hand on the armrest 11 is greater than the friction force, the problem of erroneous rotation of the armrest occurs, and therefore, the rotating member 12 and the retainer 13 are large in size to generate a sufficient frictional engagement area, thereby preventing the problem of erroneous rotation of the armrest. However, the size of the rotating member 12 and the retainer 13 is large, and the size of the rotating member and the retainer can be designed only in the inner space of the armrest 11, and the size cannot be reduced, which is disadvantageous in weight reduction.

Disclosure of Invention

The invention aims to provide a light rotary positioning mechanism.

The rotary positioning mechanism is suitable for being installed on a chair armrest, the chair armrest is provided with an armrest seat for placing hands and a supporting rod arranged on the bottom surface of the armrest seat along the height direction, the armrest seat can rotate relative to the supporting rod by taking the supporting rod as the center, and the rotary positioning mechanism comprises a fixing unit and a rotating unit.

The fixing unit is fixedly arranged on the supporting rod and comprises a fixing plate, a locating plate, an elastic ring piece and a joint block. The fixed plate is adjacent to the bottom surface of the armrest seat and is provided with two arc grooves which are arranged at intervals, and each arc groove penetrates through the top and the bottom. The positioning plate is fixedly connected to the bottom side of the fixing plate along the height direction. The elastic ring piece is arranged between the arc grooves, and the outer peripheral surface of the elastic ring piece is provided with a plurality of arc concave parts which are concave inwards and respectively face the arc grooves. The joint block is formed on one of the fixing plate and the positioning plate, and the joint block is formed with a plurality of joint concave surfaces.

The rotating unit is arranged on the chair armrest and is rotatably connected with the fixing unit, and the rotating unit rotates along with the armrest seat and comprises a linkage plate, a rotating piece and a pushing piece. The linkage plate is fixedly connected with the armrest seat and is provided with a linkage plate body positioned in the armrest seat, and two rotary columns which are spaced and respectively extend from the linkage plate body to the arc groove of the fixed plate, wherein each rotary column is used for being in friction joint with one arc concave part of the elastic ring sheet. The rotating piece is positioned between the positioning plate and the fixed plate and is used for connecting the rotating column. The pushing piece is adjacent to the joint block and arranged on the rotating piece, and can be elastically and pushingly jointed with one of the joint concave surfaces of the joint block.

According to the rotary positioning mechanism, the fixing plate is further provided with the positioning shaft which extends along the axis and is sleeved by the elastic ring piece, the joint block is formed on the fixing plate, the joint concave faces face the positioning shaft, the arc grooves are arranged on two opposite sides of the positioning shaft along the base line, the axis is parallel to the height direction, and the base line is perpendicular to the axis.

According to the rotary positioning mechanism disclosed by the invention, the positioning plate is positioned at the bottom side of the elastic ring piece and is connected with the positioning shaft, the positioning plate is provided with the positioning hole which extends along the axis and is fixedly connected with the positioning shaft, the rotating piece is provided with the accommodating groove of the joint block facing the fixed plate, the pushing piece is accommodated in the accommodating groove, and the pushing piece is provided with the pushing convex part for pushing against one of the joint concave surfaces.

The rotary positioning mechanism of the invention is characterized in that the rotary piece is also provided with a through hole encircling the outside of the positioning shaft, two screw holes which are respectively positioned at two opposite sides of the through hole and correspond to the rotary column, the through hole is communicated with the accommodating groove, and the rotary unit is also provided with two connecting pieces which respectively penetrate through the rotary column and are screwed with the screw holes.

According to the rotary positioning mechanism, the elastic ring piece is further provided with a central hole sleeved on the positioning shaft, and a plurality of hollowed holes which are positioned between the central hole and the arc concave part and penetrate through the top and the bottom.

In the rotary positioning mechanism, the pushing piece is further provided with a pushing seat accommodated in the accommodating groove and a spring which can be compressively arranged in the pushing seat, and the pushing seat is provided with the pushing convex part.

The fixed plate is also provided with a fixed plate body which is abutted against the bottom surface of the armrest seat, the positioning shaft extends from the fixed plate body towards the bottom side and is provided with a hollow pipe and a positioning pin, and the positioning pin penetrates through the hollow pipe and is fixedly connected with a positioning hole of the positioning plate.

In the rotary positioning mechanism of the invention, the pushing convex part of the pushing piece is positioned in the direction vertical to the base line.

Another object of the present invention is to provide a handrail frame having the above-mentioned rotation positioning mechanism and being light-weighted, and in which the handrail seat is rotatable.

The armrest frame with the rotatable armrest seat comprises a chair armrest and the rotary positioning mechanism.

The chair armrest is provided with an armrest seat for placing hands and a support rod arranged on the bottom surface of the armrest seat along the height direction, and the armrest seat can rotate relative to the support rod by taking the support rod as the center.

It is still another object of the present invention to provide a chair having the above armrest frame in which the armrest seat is rotatable.

The chair comprises a seat, a chair leg unit and at least one armrest frame with rotatable armrest seat. The seat is used for being seated, the chair foot unit is arranged at the bottom side of the seat, and the rotatable armrest frame of the armrest seat is connected with the seat.

The invention has the beneficial effects that: the rotating post is respectively in friction joint with the two arc concave parts of the elastic ring piece, and the pushing piece can be in elastic pushing joint with a contact point formed by the joint concave surface of one of the joint blocks, so that enough friction force is generated, the problem of incorrect rotation of the armrest seat can be avoided, the size of the rotary positioning mechanism can be miniaturized, the fixing unit is arranged on the supporting rod, and the rotatable armrest frame of the armrest seat and the chair achieve the effect of light weight.

Drawings

Other features and advantages of the present invention will become apparent from the following description of the embodiments with reference to the drawings, in which:

FIG. 1 is a schematic plan view illustrating a multi-functional seat armrest assembly of U.S. patent publication No. US20080073965A 1;

FIG. 2 is a fragmentary, exploded perspective view of the multi-function armrest assembly;

FIG. 3 is a perspective view of an embodiment of the chair of the present invention;

FIG. 4 is an exploded perspective view of the armrest frame of the embodiment;

FIG. 5 is a schematic bottom view illustrating the armrest seat of the chair armrest of the armrest frame being rotatable relative to the support rod;

FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5;

FIG. 7 is a fragmentary exploded perspective view illustrating the rotational positioning mechanism of the armrest frame mounted to the chair armrest;

FIG. 8 is a perspective view of the fixed plate of the rotational positioning mechanism and the support bar;

FIG. 9 is a perspective view of the combination of the fixing plate and the elastic ring piece from another angle;

FIG. 10 is a fragmentary perspective assembly view illustrating the armrest seat in an intermediate position relative to the support rod;

FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. 5;

FIG. 12 is a view similar to FIG. 9, illustrating the armrest seat rotated to an internal rotational position relative to the support rod; and

Fig. 13 is a view similar to fig. 9, illustrating the armrest seat rotated to an outward-rotated position relative to the support rod.

Detailed Description

Referring to fig. 3 and 4, an embodiment of the chair of the present invention includes a seat 200, a leg unit 300, and two armrest frames 400.

The seat 200 is used for sitting, and the leg unit 300 is provided at the bottom side of the seat 200 and supports the seat 200.

The armrest frame 400 is respectively mounted on the left and right sides of the seat 200 along a left-right direction Y, and each armrest seat rotatable armrest frame 400 comprises a chair armrest 5 and a rotary positioning mechanism 6. The chair armrest 5 has an armrest seat 51 extending in a front-rear direction X for holding a hand, and a support rod 52 disposed on a bottom surface of the armrest seat 51 in a height direction Z and fixed to the seat 200.

Referring to fig. 4 to 6, the armrest seat 51 may horizontally rotate with respect to the support rod 52. The armrest seat 51 has a front end 501 and a rear end 502 disposed in opposite directions. In this embodiment, the armrest seat 51 has a bottom shell 511 surrounding a receiving space 510, and a top plate 512 for closing the receiving space 510 of the bottom shell 511. The bottom case 511 is connected to the support rod 52 and has a bottom opening 513 formed at a bottom side and communicating with the accommodating space 510. The top plate 512 is used for placing hands. The support rod 52 has a head 521 connected to the armrest seat 51, and a shaft 522 extending from the head 521 toward the bottom, the head 521 having a side opening 523 open to the side and communicating with the inside.

Referring to fig. 6 to 8, each of the rotary positioning mechanisms 6 includes a fixed unit 61 and a rotating unit 62. The fixing unit 61 is fixedly disposed on the support rod 52 and includes a fixing plate 63, an elastic ring plate 64, and a positioning plate 65. The fixing plate 63 is adjacent to the bottom surface of the armrest seat 51, preferably, the fixing plate 63 is integrally formed and has a fixing plate body 631 that is abutted against the bottom surface of the armrest seat 51 and is screwed and fixed to the support rod 52, a positioning shaft 632 that extends from the fixing plate body 631 toward the bottom along an axis CL, and a joint block 633 that is formed on the bottom surface of the fixing plate body 631 and faces the positioning shaft 632, the axis CL being parallel to the height direction Z. The fixing unit 61 is fixedly coupled to the support rod 52 by screwing the fixing plate 631 to the support rod 52.

Referring to fig. 6, 7 and 9, the fixing plate 631 has two arc grooves 634 arranged on opposite sides of the positioning shaft 632 along a base line BL, the base line BL is perpendicular to the axis CL, and each arc groove 634 penetrates the top and bottom along the height direction Z. In the present embodiment, the positioning shaft 632 has a hollow tube 635 extending downward from the fixing plate 631 along the axis CL, and a positioning pin 636 passing through the hollow tube 635 and fixedly connected to the positioning plate 65, so that the hollow tube 635 is fixedly connected to the positioning plate 65. In other variations, the hollow tube 635 of the positioning shaft 632 can be a solid rod with a screw thread at its bottom end, and the positioning pin 636 can be omitted, which also has the function of fixedly connecting the fixing plate 63 with the positioning plate 65. The engagement block 633 has three engagement concave surfaces 637 formed on the outer circumferential surface and facing the positioning shaft 632, and preferably, the engagement concave surfaces 637 are substantially wavy curved surfaces and are connected end to end.

The elastic ring piece 64 is disposed around the positioning shaft 632 and is embedded in the fixing plate 631, the elastic ring piece 64 is made of plastic material and is disposed between the arc grooves 634, preferably, the elastic ring piece 64 has a central hole 641 disposed around the positioning shaft 632, six arc concave portions 642 formed on the outer peripheral surface and concave toward the direction of the axis CL, and a plurality of hollow holes 643 disposed between the central hole 641 and the arc concave portions 642 and penetrating the top and bottom, the arc concave portions 642 are equally divided into two groups and respectively correspond to the arc grooves 634, and each group of arc concave portions 642 faces the corresponding arc groove 634. The elastic ring piece 64 has better elasticity by the plastic material property and the design of the hollow hole 643. In the present embodiment, the elastic ring 64 is a plastic sheet manufactured independently, but in other variations, the elastic ring 64 can be formed integrally with the fixing plate 63, which is not limited thereto. The positioning plate 65 is located at the bottom side of the elastic ring plate 64 and is fixedly connected to the positioning shaft 632, and the positioning plate 65 has a positioning hole 651 extending along the axis CL and fixedly connected to the positioning pin 636 of the positioning shaft 632, thereby fixedly connecting the positioning plate 65 and the fixing plate 63.

Referring to fig. 6, 7 and 10, the rotating unit 62 is disposed on the chair armrest 5 and rotates along with the armrest seat 51, and the rotating unit 62 is rotatably connected to the fixing unit 61 and includes a linkage plate 66, a rotating plate 67, two connecting members 68 and a pushing member 69. The linkage plate 66 is fixedly connected with the armrest seat 51 and has a linkage plate body 661 located inside the armrest seat 51, and two rotating posts 662 spaced apart from each other and extending from the linkage plate body 661 to the fixing plate 63, wherein the rotating posts 662 are respectively disposed through the arc grooves 634, each rotating post 662 is used for being frictionally engaged with one of the arc recesses 642 of the elastic ring piece 64, and preferably, each rotating post 662 has four convex portions 663 symmetrically spaced and formed on the outer peripheral surface and protruding outwards, thereby having a better friction engagement effect.

Note that, in this embodiment, a gap is maintained between the armrest seat 51 and the support rod 52, and the armrest seat 51 and the support rod 52 are positioned by abutting the linkage plate 66 against the bottom shell 511 of the armrest seat 51.

Referring to fig. 6, 7 and 11, the rotating plate 67 is located between the positioning plate 65 and the fixing plate 63 and is fixedly connected to the bottom end of the rotating post 662, preferably, the rotating plate 67 has a receiving groove 671 opened on the outer circumferential surface and facing the joint block 633, a through hole 672 communicating with the receiving groove 671 and allowing the positioning shaft 632 to pass through, and two screw holes 673 located on opposite sides of the through hole 672 and corresponding to the rotating post 662. The connecting pieces 68 are respectively inserted through the rotating posts 662 and screwed into the screw holes 673, so that the rotating pieces 67 are fixedly connected with the interlocking plate 66.

Referring to fig. 7, 10 and 11, the pushing member 69 is adjacent to the engagement block 633 and is accommodated in the accommodating groove 671 of the rotating plate 67, and the pushing member 69 can be elastically and slidably engaged with one of the engagement concave surfaces 637 of the engagement block 633. In this embodiment, the pushing member 69 has a pushing seat 691 accommodated in the accommodating groove 671, and a spring 692 compressively disposed in the pushing seat 691 and elastically supporting the positioning shaft 632, so that the pushing member 69 can be elastically disposed between the engagement block 633 and the positioning shaft 632. In other variations, the accommodating groove 671 of the rotating plate 67 and the through hole 672 may not be in communication, and the spring 692 may be mounted in the accommodating groove 671 and may be pressed against the space between the rotating plate 67 and the engagement block 633, which may also have the function of pressing the pressing member 69 to engage with one of the concave engagement surfaces 637 of the engagement block 633. The abutment 691 has a pushing protrusion 693 for engaging with one of the concave engaging surfaces 637, and preferably the pushing protrusion 693 is located in a direction perpendicular to the base line BL.

Note that, in the present embodiment, the engagement block 633 is formed on the bottom surface of the fixing plate 63, but in other variations, the engagement block 633 may be formed on the top surface of the positioning plate 65, and the engagement block may also have the function of being elastically engaged by the pushing member 69.

Referring to fig. 10, 12 and 13, the armrest seat 51 is horizontally rotatable relative to the support rod 52 between an intermediate position (see fig. 10), an inner rotated position (see fig. 12), and an outer rotated position (see fig. 13). As shown in fig. 10, in the intermediate position, the armrest seat 51 is substantially parallel to the front-rear direction X, each swivel post 662 is located at the center of the respective arc groove 634 and frictionally engages the arc recess 642 in the middle of the elastic ring piece 64, and the pushing member 69 is pushed against the engagement concave surface 637 in the center of the engagement block 633. As shown in fig. 12, in the internal rotation position, the armrest seat 51 rotates horizontally relative to the support rod 52 until the front end 501 of the armrest seat 51 rotates inward and the rear end 502 of the armrest seat 51 rotates outward, so that the armrest seat 51 and the front-rear direction X form an angle, and at the same time, each rotating post 662 moves to one side of the corresponding arc groove 634 and is frictionally engaged with the arc recess 642 on one side of the elastic ring 64, and rotates the rotating plate 67 to drive the pushing member 69 to push against the engagement concave 637 on one side of the engagement block 633. As shown in fig. 13, in the outward rotation position, the armrest seat 51 rotates horizontally relative to the support rod 52 until the front end 501 of the armrest seat 51 rotates outward and the rear end 502 of the armrest seat 51 rotates inward, so that the armrest seat 51 and the front-rear direction X form an angle therebetween, each rotation post 662 moves to the other side of the corresponding arc groove 634 and is frictionally engaged with the arc recess 642 on the other side of the elastic ring 64, and the rotation piece 67 is rotated to drive the pushing piece 69 to push against the engagement concave 637 on the other side of the engagement block 633. Therefore, the angle of the armrest seat 51 can be adjusted by horizontal rotation according to different sitting posture requirements, so that the armrest seat is more ergonomic and the comfort level of sedentary sitting is improved.

In summary, according to the present invention, the rotating post 662 is frictionally engaged with the two arc recesses 642 of the elastic ring 64, and the pushing member 69 is elastically pushed against the contact point formed by the three portions of the engaging concave 637 of the engaging block 633, so that the armrest seat 51 can be rotatably positioned, and a sufficient friction force is generated, the problem of incorrect rotation of the armrest seat 51 can be avoided, the size of the rotary positioning mechanism 6 can be reduced, all the contact points of the fixing unit 61 and the three portions can be disposed inside the supporting rod 52, and the armrest frame 400 and the manufactured chair can achieve a light weight effect, so that the present invention can be reliably achieved.

The foregoing is merely illustrative of the present invention and is not intended to limit the scope of the invention, which is defined by the appended claims and their equivalents.

Claims (10)

1. The utility model provides a rotary positioning mechanism, is applicable to and installs at the chair handrail, the chair handrail has the handrail seat that is used for putting the hand, and along the direction of height set up in the bracing piece of the bottom surface of handrail seat, the handrail seat can the bracing piece is the center and for the bracing piece is rotatory, its characterized in that: the rotational positioning mechanism includes:

the fixed unit, set up fixedly in the bracing piece just includes:

the fixed plate is adjacent to the bottom surface of the armrest seat and is provided with two arc grooves which are arranged at intervals, and each arc groove penetrates through the top and the bottom;

the positioning plate is fixedly connected to the bottom side of the fixing plate along the height direction;

the elastic ring piece is arranged between the arc grooves, and the outer circumferential surface of the elastic ring piece is provided with a plurality of arc concave parts which are concave inwards and respectively face the arc grooves; and

The joint block is formed on one of the fixed plate and the positioning plate, and a plurality of joint concave surfaces are formed on the joint block; and

The rotating unit is arranged on the chair armrest and rotatably connected with the fixing unit, and the rotating unit rotates along with the armrest seat and comprises:

the linkage plate is fixedly connected with the armrest seat and is provided with a linkage plate body positioned in the armrest seat, and two rotary columns which are spaced and extend from the linkage plate body to the arc grooves of the fixed plate respectively, and each rotary column is used for being in friction joint with one arc concave part of the elastic ring sheet;

the rotating piece is positioned between the positioning plate and the fixed plate and is used for connecting the rotating column; and

The pushing piece is adjacent to the joint block and arranged on the rotating piece, and can be elastically and pushingly jointed with one of the joint concave surfaces of the joint block.

2. The rotational positioning mechanism of claim 1, wherein: the fixing plate is further provided with a positioning shaft extending along an axis and sleeved by the elastic ring piece, the joint block is formed on the fixing plate, the joint concave faces face the positioning shaft, the arc grooves are arranged on two opposite sides of the positioning shaft along a base line, the axis is parallel to the height direction, and the base line is perpendicular to the axis.

3. The rotary positioning mechanism of claim 2, wherein: the positioning plate is positioned at the bottom side of the elastic ring piece and is connected with the positioning shaft, the positioning plate is provided with a positioning hole which extends along the axis and is fixedly connected with the positioning shaft, the rotating piece is provided with a containing groove which faces to the joint block of the fixing plate, the pushing piece is contained in the containing groove, and the pushing piece is provided with a pushing convex part which is used for pushing one of the joint concave surfaces.

4. A rotary positioning mechanism according to claim 3, wherein: the rotating plate is further provided with a through hole encircling the outside of the positioning shaft, two screw holes which are respectively arranged on two opposite sides of the through hole and correspond to the rotating column, the through hole is communicated with the accommodating groove, and the rotating unit further comprises two connecting pieces which respectively penetrate through the rotating column and are in threaded connection with the screw holes.

5. The rotary positioning mechanism of claim 2, wherein: the elastic ring piece is also provided with a central hole sleeved on the positioning shaft and a plurality of hollowed-out holes which are positioned between the central hole and the arc concave part and penetrate through the top and the bottom.

6. A rotary positioning mechanism according to claim 3, wherein: the pushing and propping piece is also provided with a pushing and propping seat accommodated in the accommodating groove and a spring which can be compressively arranged in the pushing and propping seat, and the pushing and propping seat is provided with the pushing and propping convex part.

7. A rotary positioning mechanism according to claim 3, wherein: the fixing plate is also provided with a fixing plate body which is attached to the bottom surface of the armrest seat, the positioning shaft extends from the fixing plate body towards the bottom side and is provided with a hollow pipe and a positioning pin, and the positioning pin penetrates through the hollow pipe and is fixedly connected with a positioning hole of the positioning plate.

8. A rotary positioning mechanism according to claim 3, wherein: the pushing convex part of the pushing piece is positioned in the direction perpendicular to the base line.

9. A rotatable handrail frame of handrail seat, its characterized in that: comprising:

the chair armrest is provided with an armrest seat for placing hands and a supporting rod arranged on the bottom surface of the armrest seat along the height direction, and the armrest seat can rotate relative to the supporting rod by taking the supporting rod as the center; and

The rotational positioning mechanism of claim 1.

10. A chair, characterized in that: comprising:

a seat for seating;

the chair leg unit is arranged at the bottom side of the chair; and

At least one armrest mount rotatable armrest mount according to claim 9, the armrest mount rotatable armrest mount being connected to the seat.