CN204930966U - A kind of flexible leg rest mechanism of seat - Google Patents

Abstract

The utility model relates to the field of office chairs. A telescopic footrest mechanism for a seat comprises a footrest arranged at the lower end of a chair seat and a footrest arranged on the footrest; the footrest includes a footrest arranged on the chair The shelf plate on the end surface of the seat, the short crank hinged on the shelf plate in the middle, the shelf rod hinged on the shelf plate at the end, and the link rods respectively hinged on the short crank and the shelf rod at both ends; The footrest is arranged on the plate frame rod, and the plate frame rod links the short crank through the link rod, and the plate frame plate is also hinged with a paddle for moving and limiting the short crank. The paddle can rotate along its hinge e, and the short crank Within the radius of rotation of the pick. The telescopic footrest mechanism of the seat is a self-locking footrest mechanism, which has a simple and stable structure, is easy to operate, and has sufficient front extension, which can give the most appropriate support to the lower legs, fully relieve the pressure on the legs, promote blood circulation, and make people sit comfortably. healthier.

Description

A retractable footrest mechanism for a seat

technical field

The utility model relates to the field of office seats, in particular to a telescopic footrest mechanism for a seat.

Background technique

Most of the traditional office chairs are mainly for sitting, and rarely have a footrest, so office workers cannot fully relax when they are resting. At present, some seats sold on the market have manual footrest mechanisms, but such mechanisms are troublesome to assemble and unlock, bloated mechanisms, not beautiful enough to hide, and the front extension is not enough, the stability is not good, and the user experience is not good. .

Contents of the invention

In order to solve the above problems, the purpose of this utility model is to provide a telescopic footrest mechanism for a seat. Give the calf the most appropriate support, which can fully relieve the pressure on the legs, promote blood circulation, and make people sit healthier.

In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

A telescopic footrest mechanism for a seat, comprising a footrest arranged at the lower end of a seat, and a footrest arranged on the footrest; the footrest includes a frame plate arranged on the lower end surface of the seat, and The short crank in the middle is hinged on the frame plate, the frame rod at the end is hinged on the frame plate, and the connecting rods at both ends are respectively hinged on the short crank and the frame rod; the footrest is arranged on the frame rod On the top, the plate frame rod links the short crank through the link rod, and the plate is also hinged with a paddle for moving and limiting the short crank. The paddle can rotate along its hinge e, and the short crank is within the rotation radius of the paddle; When the hinge a of the short crank and the frame plate, the hinge b of the short crank and the connecting rod, and the hinge c of the connecting rod and the plate frame rod are on the same straight line in turn, the end of the short crank is against the paddle, and the plate frame The rod is flipped forward along the hinge d at its end to the working self-locking position; when the hinge b of the short crank and the connecting rod, the hinge a of the short crank and the frame plate, and the hinge c of the connecting rod and the frame rod are sequentially When being on the same straight line, the end of the short crank is against the plectrum, and the plate frame bar is turned down to the folding self-locking station along the hinge d of its end.

Preferably, a first return tension spring is provided between the hinge a of the short crank and the shelf and the shelf, and a second return tension spring is provided between the free end of the plectrum and the shelf. The first return extension spring and the second return extension spring are respectively used to promote the reset of the short crank and the plectrum. When the footrest is in the retracted self-locking state, the short crank automatically crosses the dead point under the action of the first return extension spring. Hold on to the paddles for a stable support.

As a preference, the paddle is positioned through a shaft provided on the shelf, the paddle is connected and fixed to the shaft, a handle is provided on the end of the shaft, and the handle is outside the shelf; when in use, the operator can use the Rotate the handle to control the rotation of the paddle.

As a preference, one end of the footrest is hinged on the free end of the plate frame rod through a plate shaft, and the footrest can rotate along the plate shaft; a limit hole is provided on the plate frame rod, and the limit hole is a semicircle centered on the plate shaft The arc-shaped through hole is provided with a limit block matching the limit hole on the footrest. When in use, the footrest takes the plate shaft as the center and rotates with the limit hole as the track, which reduces the retractable space of the footrest while increasing the forward distance of the footrest.

Preferably, a spring pin is provided on the plate frame rod, and a socket matching the spring pin is provided on the side of the footrest, and the spring pin is matched with the circular arc of the socket to cancel. When the footrest is folded and self-locking, the footrest is limited and fixed by the spring latch to prevent the footrest from rotating; when the footrest needs to be opened for use, manual force can be used, and the arc matching can be directly released.

The utility model adopts the above-mentioned technical scheme. The telescopic footrest mechanism of the seat is a self-locking footrest mechanism. Set on the plate frame rod, the plate frame rod links the short crank through the link rod, and manually drives the footrest to extend and retract when in use. Due to the kinematic characteristics of the four-bar mechanism, two dead points are formed in the folded state and the working state The position can be used as the locking device of the mechanism; that is, when the hinge a of the short crank and the frame plate, the hinge b of the short crank and the connecting rod, and the hinge c of the connecting rod and the frame rod are on the same straight line in turn , the end of the short crank is against the paddle, and the plate frame rod is turned forward along the hinge d of its end to the working self-locking position. In the working self-locking state, the footrest stretches forward to support the user's calf , to achieve the purpose of rest; when the hinge b of the short crank and the connecting rod, the hinge a of the short crank and the frame plate, and the hinge c of the connecting rod and the frame rod are on the same straight line in sequence, the end of the short crank touches Hold the paddle, turn the plate frame rod downwards along the hinge d at its end to the folding self-locking position, and the footrest is stored at the lower end of the seat in the folding self-locking state. Therefore, the self-locking footrest mechanism adopts the mechanism dead angle principle, which has the advantages of simple and stable structure, convenient operation, sufficient front extension, can give the most appropriate support to the calf, can fully relieve the pressure on the leg, promote blood circulation, and make people sit more comfortably. healthy.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a schematic diagram of the working state of the utility model.

Fig. 3 is a schematic diagram of the retracted state of the footrest.

detailed description

Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in further detail.

A telescopic footrest mechanism for a seat as shown in FIGS. 1 to 3 includes a footrest arranged at the lower end of the seat 1 and a footrest 2 arranged on the footrest. Described footrest comprises the frame plate 31 that is arranged on the lower end face of seat seat 1, and the short crank 32 that middle part is hinged on the frame plate 31, and the plate frame bar 34 that end is hinged on the frame plate 31, and two ends Part is hinged on the link rod 33 on the short crank 32 and the plate frame rod 34 respectively. The footrest 2 is arranged on the frame rod 34, the frame rod 34 links the short crank 32 through the connecting rod 33, and the hinge a of the short crank 32 and the frame plate 31 and the frame plate 31 is also provided with a first reset pull. Spring 41. The frame plate 31 is also hinged with a paddle 51 used to toggle and limit the short crank 32. The paddle 51 is positioned through a shaft 52 disposed on the frame plate 31. The paddle 51 is connected and fixed with the shaft rod 52, and the shaft A handle 53 is provided on the end of the rod 52 , and the handle 53 is located outside the frame plate 31 , and a second return tension spring 42 is also provided between the free end of the plectrum 51 and the frame plate 31 . During use, the operator can control the paddle 51 by rotating the handle 53, the paddle 51 can rotate along its hinge e (that is, the shaft 52), and the short crank 32 is within the radius of rotation of the paddle 51; and the first Reset extension spring 41 and second reset extension spring 42 are respectively used to promote short crank 32, paddle 51 to reset. Cross the dead point, withstand the paddle 51, and support it stably.

Under this structure, the retractable footrest mechanism of the seat is a self-locking footrest mechanism, and the footrest specifically adopts a transmission four-bar mechanism, which includes a frame plate 31, a short crank 32, a plate frame rod 34 and a connecting rod 33, and the footrest 2 is arranged on the plate frame rod 34, the plate frame rod 34 links the short crank 32 through the link rod 33, and the footrest 2 is extended and retracted by manually driving the footrest 2 during use. The state forms two dead point positions, and relies on the plectrum 51 to act as a limit, and reacts with the external force moment (gravity and the pressure of the legs), so that the movement of the mechanism can be restricted and the self-locking effect can be achieved. That is, when the hinge a of the short crank 32 and the frame plate 31, the hinge b of the short crank 32 and the connecting rod 33, and the hinge c of the connecting rod 33 and the plate frame rod 34 are successively on the same straight line, the end of the short crank 32 Part against the plectrum 51, the plate frame rod 34 is turned forward along the hinge d at its end to the working self-locking position, and the footrest 2 is stretched forward in the working self-locking state to support the user's calf, reaching The purpose of rest; when the hinge b of the short crank 32 and the connecting rod 33, the hinge a of the short crank 32 and the frame plate 31, and the hinge c of the connecting rod 33 and the frame rod 34 are on the same straight line successively, the short crank The end of 32 is against pick piece 51, and plate frame bar 34 is turned down along its end hinge d to draw in self-locking station, under the draw in self-locking state, footrest 2 is accommodated in seat 1 lower end. Therefore, the self-locking footrest mechanism adopts the mechanism dead angle principle, which has the advantages of simple and stable structure, convenient operation, sufficient front extension, can give the most appropriate support to the calf, can fully relieve the pressure on the leg, promote blood circulation, and make people sit more comfortably. healthy.

One end of described footrest 2 is hinged on the free end of plate frame bar 34 by plate shaft 61, and footrest 2 can rotate along plate shaft 61; Plate frame bar 34 is provided with limit hole 341, and limit hole 341 is in the form of a plate The shaft 61 is a semicircular through hole at the center, and the footrest 2 is provided with a limit block 62 matched with the limit hole 341; A socket matched with the spring pin 343 is provided, and the spring pin 343 is matched with the circular arc of the socket to offset. When in use, the footrest 2 is centered on the plate shaft 61 and rotates on the limit hole 341 as a track. When the forward distance of the footrest 2 is increased, the retractable space of the footrest 2 is reduced. When the footrest is in the folded self-locking state, the footrest is limited and fixed by the spring latch 343 to prevent the footrest from rotating; when the footrest needs to be opened for use, manual force can be used, and the arc matching can be directly released.

Claims (5)

1. a flexible leg rest mechanism for seat, comprises the footrest rack being arranged on seat support lower end, and is arranged on the toe board on footrest rack; It is characterized in that: described footrest rack comprises the frame plate be arranged on seat support lower surface, and middle part is hinged on the short crank on frame plate, and end is hinged on the grillage bar on frame plate, and both ends are hinged on the link rod on short crank, grillage bar respectively; Described toe board is arranged on grillage bar, and grillage bar to be linked short crank by link rod, and frame plate is also hinged with the plectrum for stirring and limit short crank, plectrum can rotate along its hinged place e, and short crank is within the radius of turn of plectrum; As the hinged place a of short crank and frame plate, the hinged place b of short crank and link rod, when the hinged place c of link rod and grillage bar is on same straight line successively, the end of short crank props up plectrum, and grillage bar turn to forward work self-locking station along its hinged place, end d; As the hinged place b of short crank and link rod, the hinged place a of short crank and frame plate, when the hinged place c of link rod and grillage bar is on same straight line successively, the end of short crank props up plectrum, and grillage bar turn to downwards along its hinged place, end d and draws self-locking station in.

2. the flexible leg rest mechanism of a kind of seat according to claim 1, is characterized in that: be also provided with the first reset tension spring between the hinged place a of described short crank and frame plate and frame plate, be also provided with the second reset tension spring between the free end of plectrum and frame plate.

3. the flexible leg rest mechanism of a kind of seat according to claim 2, is characterized in that: described plectrum is by running through the axostylus axostyle location be arranged on frame plate, and plectrum and axostylus axostyle are connected and fixed, and the end of axostylus axostyle is provided with handle, and handle is in outside frame plate.

4. the flexible leg rest mechanism of a kind of seat according to claim 1, is characterized in that: one end of described toe board is hinged on by plate axle on the free end of grillage bar, and toe board can rotate along plate axle; Grillage bar is provided with spacing hole, and spacing hole is in the semicircular arc through hole centered by plate axle, and toe board is provided with the limited block matched with spacing hole.

5. the flexible leg rest mechanism of a kind of seat according to claim 4, is characterized in that: described grillage bar is also provided with night bolt, and the side of toe board is provided with the socket matched with night bolt, and night bolt mates with socket circular arc and offsets.