CN214678334U - One-step unfolding leg support - Google Patents

Abstract

The utility model discloses a one-step expansion type leg support, which comprises a seat cushion, wherein the front part of the seat cushion is provided with a leg support body, a leg support linear drawing component is arranged on the seat cushion and comprises a drawing fixed part and a drawing sliding part which are assembled in a sliding way along the front and back directions of the seat cushion, the drawing fixed part is arranged on the seat cushion, the front part of the drawing sliding part is hinged with the leg support body, and the drawing sliding part drives the leg support body to advance and retreat along the drawing fixed part; and a secondary propelling mechanism is arranged on the drawing sliding part and connected with the leg support body, and the secondary propelling mechanism pushes the leg support body to rotate. The remarkable effects of the scheme are as follows: through setting up leg support sharp pull subassembly to set up secondary advancing mechanism on it, make the leg support realize the upset in the front and back pull in order to carry out the expansion of step-by-step or accomodate, avoided complicated link mechanism, simplified the structure greatly.

Description

One-step unfolding leg support

Technical Field

The utility model relates to a seat shank support nature function piece, concretely relates to leg support.

Background

Office chairs are important office furniture. Along with the demand of office crowd to office chair travelling comfort constantly increases, office chair is constantly developing to multi-functional direction gradually. At the present stage, the multifunctional office chair mainly needs to meet the following requirements besides meeting the requirements of people for sitting:

1. the seat backrest can be inclined, and the inclined angle can be adjusted and fixed so as to meet different lying requirements of passengers, such as half lying or full lying;

2. the seat cushion of the seat can be turned over by a certain angle, so that the front part of the seat cushion is upward and the rear part of the seat cushion is downward, and the knees of a passenger are raised to different degrees;

3. when the passenger has a rest, the legs can be supported by the leg supports, so that the comfort is improved.

In order to meet the above requirements, engineers in related fields have partial research results, and can meet corresponding requirements independently. However, due to lack of overall planning, on one hand, the structure adopted by the prior art is not simplified enough, and on the other hand, after the functions are combined by adopting the prior art, the office chair has a complex and bloated structure, and the structures corresponding to the functions are seriously interfered with each other, so that the office chair has the defects of heavy weight, insufficient aesthetic property and the like. Therefore, it is necessary to plan the implementation of each requirement as a whole again to integrate the functions. During the integration process, various structural members and linkage relations need to be planned and designed again.

When in use, the leg support needs to extend forwards from the front and the lower part of the seat cushion to the front of the seat cushion and be in a horizontal state. The leg support for office chairs generally needs to be pulled forwards and then turned over, and the above state is achieved through two independent steps, so that the efficiency is not high enough; the existing leg support for part of automobile seats has the function of unfolding in one step, but the structure of the leg support for part of automobile seats mostly adopts a multi-connecting-rod structure, so that the leg support for part of automobile seats is complex in structure and too bulky.

Disclosure of Invention

In order to simplify the structure, the utility model provides a new one step of expansion leg support, have one step of expansion, one step of withdrawing, simple structure, advantage such as outward appearance is clean and tidy. The technical scheme is as follows:

the utility model provides a one-step expansion formula leg holds in palm, includes the seatpad, and the front portion of this seatpad is equipped with the leg and holds in the palm the body, and the key lies in: a leg support linear drawing assembly is mounted on the seat cushion and comprises a drawing fixed part and a drawing sliding part which are assembled in a sliding mode along the front-back direction of the seat cushion, wherein the drawing fixed part is arranged on the seat cushion, the front part of the drawing sliding part is hinged with the leg support body, and the drawing sliding part drives the leg support body to advance and retreat along the drawing fixed part;

and a secondary propelling mechanism is arranged on the drawing sliding part and connected with the leg support body, and the secondary propelling mechanism pushes the leg support body to rotate.

The beneficial effect of this scheme of adoption: through setting up leg support sharp pull subassembly to set up secondary advancing mechanism on it, make the leg support realize the upset in the front and back pull in order to carry out the expansion of step-by-step or accomodate, avoided complicated link mechanism, simplified the structure greatly.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a view showing the installation relationship between the leg rest body 3 and the leg rest linear drawing assembly;

FIG. 3 is a cross-sectional view Z-Z' of FIG. 2;

FIG. 4 is a cross-sectional view of Y-Y' of FIG. 2;

FIG. 5 is an enlarged view of portion A of FIG. 3;

FIG. 6 is a schematic view of the fit relationship between the push-pull screw 22 and the screw rotary seat 23 and the pushing block 27;

FIG. 7 is an enlarged view of portion B of FIG. 6;

fig. 8 is a schematic structural view of the friction reducing pad 103.

Detailed Description

The present invention will be further described with reference to the following examples and accompanying drawings.

As shown in fig. 1 to 8, a one-step unfolding leg rest comprises a seat cushion 1, a leg rest body 3 is arranged at the front part of the seat cushion 1, a leg rest linear drawing assembly is mounted on the seat cushion 1, and the leg rest linear drawing assembly comprises a drawing fixed part and a drawing sliding part which are slidably assembled along the front-back direction of the seat cushion 1, wherein the drawing fixed part is arranged on the seat cushion 1, the front part of the drawing sliding part is hinged with the leg rest body 3, and the drawing sliding part drives the leg rest body 3 to move forward and backward along the drawing fixed part; and a secondary propelling mechanism is arranged on the drawing sliding part and connected with the leg support body 3, and the secondary propelling mechanism pushes the leg support body 3 to rotate.

Specifically, the method comprises the following steps: the drawing sliding part comprises a leg support sliding seat and a push-pull screw rod 22, the leg support sliding seat is assembled with the drawing fixing part in a sliding mode, the push-pull screw rod 22 is fixedly connected with the leg support sliding seat in the axial direction, the push-pull screw rod 22 is connected with the leg support sliding seat in the circumferential direction in a rotating mode, the push-pull screw rod 22 is connected with a screw rotating mechanism, the screw rotating mechanism comprises a screw driving seat 21 and a screw rotating seat 23, the screw driving seat 21 and the seat cushion 1 are kept fixed relatively, the screw rotating seat 23 is installed on the screw driving seat 21 through a bearing seat, a screw penetrating hole penetrates through the screw rotating seat 23, the push-pull screw rod 22 penetrates through the screw penetrating hole, the push-pull screw rod 22 is in sliding fit with the screw rotating seat 23 in the axial direction, and the push-pull screw rod 22 is fixed with the screw rotating seat 23 in the circumferential direction. As a more specific embodiment, a sliding recessed portion is provided on the outer wall of the push-pull screw 22 along the axial direction thereof, the sliding recessed portion partitions the thread of the push-pull screw 22, a sliding protruding portion is fixed on the wall of the screw through hole, and the sliding protruding portion corresponds to and matches with the sliding recessed portion; the sliding protruding part is in axial sliding fit with the sliding recessed part, and the sliding protruding part is axially and annularly fixed with the sliding recessed part. Thereby, the screw rotating mechanism drives the push-pull screw 22 to rotate;

the seat cushion further comprises a rotating nut 24, the rotating nut 24 is relatively fixed with the seat cushion 1, and the rotating nut 24 is sleeved on the push-pull screw rod 22 in a threaded manner;

the secondary propelling mechanism comprises a propelling block 27, the propelling block 27 is assembled with the leg support sliding seat in a sliding mode, the propelling block 27 is in threaded sleeve connection with the push-pull screw rod 22, a turning connecting rod 29 is connected between the propelling block 27 and the leg support body 3, and two ends of the turning connecting rod 29 are hinged to the propelling block 27 and the leg support body 3 respectively.

The leg support sliding seat comprises a sliding inner tube 102, the push-pull screw rod 22 is located inside the sliding inner tube 102 and parallel to the length direction of the sliding inner tube, sealing seats are fixed at two ends of the sliding inner tube 102, two ends of the push-pull screw rod 22 are respectively installed on the corresponding sealing seats, the end portion of the push-pull screw rod 22 is fixedly connected with the corresponding sealing seats in the axial direction, the end portion of the push-pull screw rod 22 is connected with the corresponding sealing seats in an annular rotating mode, a leg support installation seat is arranged at the front end of the sliding inner tube 102, and the leg support body 3 is hinged to the leg support installation seat.

The screw rod rotating seat 23, the rotating nut 24 and the pushing block 27 are all located inside the sliding inner tube 102, the pushing block 27 is embedded in the sliding inner tube 102 in a sliding mode, and the pushing block 27 is located in front of the screw rod rotating seat 23 and the rotating nut 24.

The drawing and fixing part comprises a guide outer cylinder 101, the guide outer cylinder 101 is fixed on the seat cushion 1, the guide outer cylinder 101 is arranged along the front and back direction of the seat cushion 1, and the sliding inner pipe 102 is movably inserted in the guide outer cylinder 101;

to reduce the sliding friction of the sliding inner tube 102 in the guide outer cylinder 101: a friction reducing pad 103 is arranged between the guide outer cylinder 101 and the sliding inner tube 102, the outer wall of the friction reducing pad 103 is abutted against the inner wall of the guide outer cylinder 101, the outer wall of the friction reducing pad 103 is provided with a positioning bump 103a, a friction reducing pad clamping hole penetrates through the cylinder wall of the guide outer cylinder 101, the friction reducing pad clamping hole corresponds to the positioning bump 103a and is sleeved with the positioning bump 103a in a penetrating manner, the inner wall of the friction reducing pad 103 is provided with a plurality of friction reducing convex strips 103b, and the friction reducing convex strips 103b are abutted against the inner wall of the sliding inner tube 102; the guide outer cylinder 101 and the sliding inner tube 102 are rectangular tubes, the friction reducing pads 103 are in a C shape, the number of the friction reducing pads 103 is two, the two friction reducing pads 103 are arranged oppositely, and the edges of the two friction reducing pads 103 are spaced from each other.

The wall of the guide outer cylinder 101 is penetrated with a driving yielding hole, the sliding inner tube 102 is provided with a strip-shaped sliding yielding hole along the length direction, the driving yielding hole corresponds to and is communicated with the sliding yielding hole, the screw driving seat 21 sequentially extends into the sliding inner tube 102 from the driving yielding hole and the sliding yielding hole, and the rotating nut 24 is fixed on the screw driving seat 21.

The pushing block 27 comprises a pushing slider 271 and a pushing arm 272, the pushing slider 271 is movably embedded in the sliding inner tube 102, the pushing slider 271 is sleeved on the push-pull screw 22 in a threaded manner, a strip-shaped pushing abdicating port is further arranged on the guide outer cylinder 101 along the length direction of the guide outer cylinder, the pushing abdicating port corresponds to and is communicated with the sliding abdicating hole, the pushing arm 272 is obliquely arranged, the upper end of the pushing arm 272 is fixed with the pushing slider 271, the lower part of the pushing arm 272 sequentially extends out of the sliding abdicating hole and the pushing abdicating hole, and the lower end of the pushing arm 272 faces the leg support body 3 and is hinged to the turnover connecting rod 29.

The screw driving seat 21 is fixed on the outer wall of the guide outer cylinder 101, a power element 26 is further arranged on the screw driving seat 21, the power element 26 can be a motor, a worm wheel is fixedly sleeved on the screw rotating seat, and an output shaft of the motor is in transmission connection with the worm wheel. Therefore, when the output shaft of the motor rotates, the push-pull screw rod 22 is driven to rotate; while the push-pull screw rod 22 rotates, due to the threaded fit with the rotating nut 24, the push-pull screw rod 22 extends back and forth along the rotating nut 24, so that the sliding inner tube 102 is driven to slide back and forth in the guide outer cylinder 101, and the friction reducing convex strips 103b can reduce the sliding contact area, thereby reducing the friction force; the leg rest body 3 installed at the front end of the sliding inner tube 102 is driven to be extended and contracted forward and backward so that the leg rest is moved into/out of the seat. The push-pull screw 22 and other parts are arranged in the sliding inner tube 102, so that the appearance is simple and attractive, and the modular design is convenient for assembly and combination.

The turning connecting rod 29 is located below a hinge point of the leg rest body 3 and the leg rest mounting seat, when the push-pull screw rod 22 drives the sliding inner tube 102 to slide back and forth, the pushing block 27 advances and retreats along with the sliding inner tube, the push-pull screw rod 22 keeps rotating in the process, the pushing block 27 is driven to slide back and forth relative to the push-pull screw rod 22, and therefore the leg rest body 3 is pushed to turn.

Therefore, when the leg rest body 3 is driven to move forwards out of the seat, the leg rest body 3 is turned over and spread to be in a use state in one step; while the leg support body 3 is driven to move backwards into the seat, the leg support body 3 is turned and erected into a standby state in one step; the efficiency is improved and the time is saved by adopting a simple structure.

Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and the scope of the present invention.

Claims (10)

1. The one-step unfolding type leg support comprises a seat cushion (1), wherein a leg support body (3) is arranged at the front part of the seat cushion (1), and the leg support is characterized in that: a leg support linear drawing assembly is mounted on the seat cushion (1), and comprises a drawing fixed part and a drawing sliding part which are assembled in a sliding manner along the front-back direction of the seat cushion (1), wherein the drawing fixed part is arranged on the seat cushion (1), the front part of the drawing sliding part is hinged with the leg support body (3), and the drawing sliding part drives the leg support body (3) to advance and retreat along the drawing fixed part;

and a secondary propelling mechanism is arranged on the drawing sliding part and connected with the leg support body (3), and the secondary propelling mechanism pushes the leg support body (3) to rotate.

2. The one-step deployment leg rest of claim 1, wherein: the drawing sliding part comprises a leg support sliding seat and a push-pull screw rod (22), wherein the leg support sliding seat is assembled with the drawing fixing part in a sliding mode, the push-pull screw rod (22) is fixedly connected with the leg support sliding seat in the axial direction, the push-pull screw rod (22) is connected with the leg support sliding seat in an annular rotating mode, the push-pull screw rod (22) is connected with a screw rod rotating mechanism, and the screw rod rotating mechanism drives the push-pull screw rod (22) to rotate;

the seat cushion is characterized by further comprising a rotating nut (24), the rotating nut (24) and the seat cushion (1) are relatively fixed, and the rotating nut (24) is sleeved on the push-pull screw rod (22) in a threaded manner;

the secondary propelling mechanism comprises a propelling block (27), the propelling block (27) is assembled with the leg support sliding seat in a sliding mode, the propelling block (27) is in threaded sleeve connection with the push-pull screw rod (22), a turnover connecting rod (29) is connected between the propelling block (27) and the leg support body (3), and two ends of the turnover connecting rod (29) are hinged to the propelling block (27) and the leg support body (3) respectively.

3. The one-step deployment leg rest of claim 2, wherein: the screw rod rotating mechanism comprises a screw rod driving seat (21) and a screw rod rotating seat (23), the screw rod driving seat (21) and the seat cushion (1) are kept relatively fixed, the screw rod rotating seat (23) is rotatably assembled on the screw rod driving seat (21), a screw rod through hole penetrates through the screw rod rotating seat (23), the push-pull screw rod (22) is arranged in the screw rod through hole in a penetrating mode, the push-pull screw rod (22) is in axial sliding fit with the screw rod rotating seat (23), and the push-pull screw rod (22) and the screw rod rotating seat (23) are fixed in an annular mode.

4. The one-step deployment leg rest of claim 3, wherein: the leg support sliding seat comprises a sliding inner tube (102), the push-pull screw rod (22) is located inside the sliding inner tube (102) and parallel to the length direction of the sliding inner tube, both ends of the sliding inner tube (102) are respectively fixed with an opening sealing seat, both ends of the push-pull screw rod (22) are respectively installed on the corresponding opening sealing seats, the end part of the push-pull screw rod (22) is axially and fixedly connected with the corresponding opening sealing seat, and the end part of the push-pull screw rod (22) is annularly and rotatably connected with the corresponding opening sealing seat;

the screw rod swivel mount (23), advance nut (24) and propulsion piece (27) all are located inside slip inner tube (102), propulsion piece (27) slip inlay is established in slip inner tube (102), propulsion piece (27) are located screw rod swivel mount (23) with advance nut (24) the place ahead.

5. The one-step deployment leg rest of claim 4, wherein: the drawing and fixing part comprises a guide outer cylinder (101), the guide outer cylinder (101) is fixed on the seat cushion (1), the guide outer cylinder (101) is arranged along the front-back direction of the seat cushion (1), and the sliding inner pipe (102) is movably inserted into the guide outer cylinder (101);

the wall of the guide outer cylinder (101) is provided with a driving yielding hole in a penetrating mode, the sliding inner tube (102) is provided with a strip-shaped sliding yielding hole along the length direction, the driving yielding hole corresponds to the sliding yielding hole and is communicated with the sliding yielding hole, the screw driving seat (21) sequentially follows the driving yielding hole and the sliding yielding hole to stretch into the sliding inner tube (102), and the turning nut (24) is fixed to the screw driving seat (21).

6. The one-step deployment leg rest of claims 3, 4 or 5, wherein: the outer wall of the push-pull screw (22) is provided with a sliding concave part along the axial direction, the sliding concave part separates threads of the push-pull screw (22), a sliding convex part is fixed on the wall of the through hole of the screw, and the sliding convex part corresponds to the sliding concave part and is matched with the sliding concave part;

the sliding protruding part is in axial sliding fit with the sliding recessed part, and the sliding protruding part is axially and annularly fixed with the sliding recessed part.

7. The one-step deployment leg rest of claim 5, wherein: be equipped with between direction urceolus (101) and the slip inner tube (102) and reduce friction pad (103), the outer wall of reduce friction pad (103) with the inner wall of direction urceolus (101) supports tightly the outer wall of reduce friction pad (103) is equipped with location lug (103 a) the section of thick bamboo wall of direction urceolus (101) has run through antifriction pad screens hole, this antifriction pad screens hole with location lug (103 a) correspond and wear the cover each other the inner wall of reduce friction pad (103) is equipped with a plurality of antifriction sand grips (103 b), this antifriction sand grip (103 b) with the inner wall of slip inner tube (102) supports and leans on.

8. The one-step deployment leg rest of claim 7, wherein: the guide outer cylinder (101) and the sliding inner tube (102) are rectangular tubes, the friction reducing pads (103) are C-shaped, the number of the friction reducing pads (103) is two, the two friction reducing pads (103) are arranged right opposite to each other, and the edges of the two friction reducing pads (103) are spaced from each other.

9. The one-step deployment leg rest of claims 5, 7 or 8, wherein: the push block (27) comprises a push slider (271) and a push arm (272), the push slider (271) is movably embedded in the sliding inner tube (102), the push slider (271) is sleeved on the push-pull screw (22) in a threaded manner, a strip-shaped push abdicating port is further arranged on the guide outer tube (101) along the length direction of the guide outer tube, the push abdicating port corresponds to and is communicated with the sliding abdicating hole, the push arm (272) is obliquely arranged, the upper end of the push arm (272) is fixed with the push slider (271), the lower part of the push arm (272) sequentially extends out of the sliding abdicating hole and the push abdicating hole, and the lower end of the push arm (272) faces the leg support body (3) and is hinged to the turnover connecting rod (29).

10. The one-step deployment leg rest of claim 5, wherein: screw rod swivel mount (23) are installed through the bearing frame on screw rod drive seat (21), screw rod drive seat (21) are fixed the outer wall of direction urceolus (101) still be equipped with power original spare (26) on screw rod drive seat (21), power original spare (26) with screw rod swivel mount (23) transmission is connected.

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