CN218682773U - Lifting locking device and desk and chair based on same - Google Patents

Abstract

The utility model discloses a lifting locking device and a desk and chair based on the device, wherein the desk and chair comprises desk legs and two lifting locking devices which are respectively arranged on the desk legs at two sides, the two lifting locking devices are connected through a transmission shaft, each side desk leg comprises two upright posts, a rack is arranged on one of the upright posts, the lifting locking device comprises a rack and a gear meshed with the rack, and the center of the gear is fixedly provided with the transmission shaft; an inner ring of the bearing is fixed on the transmission shaft, the driving wheel is arranged on the outer side of the locking disc and is fixedly connected with the transmission shaft, a hand rocker arm is arranged on the driving wheel, one end of the hand rocker arm is connected with one end of the transmission shaft through a hand rocker arm folding device, and the other end of the hand rocker arm is provided with a handle; the driving wheel and the locking disk are respectively provided with a driving wheel groove and a locking disk groove which can accommodate the hand rocker arm; a handle lock hole is formed in the groove of the locking disc, and the size of the handle lock hole is matched with that of the handle. The utility model discloses simple structure, the operation of going up and down is convenient with the locking.

Description

Lifting locking device and desk and chair based on same

Technical Field

The utility model relates to a lift locking device field to and utilize the device to establish a convenient nimble hand formula lift desk chair that has free locking function.

Background

In school education and teaching activities, the children generally develop fast in the stages from kindergarten to senior high school; and the body development speed of different children in the same age group is very different. This has resulted in two situations at the school student: firstly, the height of the same student is rapidly increased in different grades, and secondly, the height difference of different students in the same class is large in the same time period. However, the current school desks and chairs are very simple and poor, cannot be lifted according to the height requirements of students, and cannot completely meet the requirements of classroom learning of children, so that the sitting postures of the children are incorrect, and the body development of the children is greatly influenced. Many children bend the back to form a dustpan back; the general decline of vision also has a great relationship with improper tables and chairs and improper sitting posture.

Therefore, some manufacturers adopt a fixed-position lifting method to solve the lifting problem of desks and chairs. The legs of the lifting table and chair are composed of two parts, only two parts of components are adopted, and then the two parts of components are connected through screws. However, since the lifting devices used in such desks and chairs are connected by screws, workers are required to detach the screws by using a wrench each time the desk and chair is lifted, and then the desk and chair is mounted after the height is adjusted, which is very troublesome and cannot be lifted at any time according to the needs; and the lifting device is not stable and the screw is easy to rust, so that the lifting device has a lot of inconvenience in practical use, and the use rate is extremely low.

Disclosure of Invention

A first object of the present invention is to provide a lift locking device that is easy to lock. The second purpose is to provide a desk and chair for meeting the requirements of different heights of students at different school stages from kindergartens to university, which has the function of being capable of being lifted and locked at will at any time and is particularly suitable for classrooms of schools.

In order to achieve the first purpose, the utility model provides a gear rack lifting locking device, which comprises a rack and a gear meshed with the rack; two gears are fixed at the positions of the transmission shafts close to the two end parts, and the transmission shafts are fixed at the central positions of the gears;

the inner ring of the bearing is fixed with the part of the transmission shaft extending out of the gear, the bearing is embedded into and fixed with the bearing seat, and the bearing seat is embedded into the locking disc;

the driving wheel is arranged on the outer sides of the bearing seat and the locking disc, is sleeved at the tail end of the transmission shaft and is fixed, a hand rocker arm is arranged at the tail end of the transmission shaft in the center of the driving wheel, one end of the hand rocker arm is connected with the tail end of the transmission shaft through a hand rocker arm folding device, and the other end of the hand rocker arm is provided with a handle;

the driving wheel and the locking disk are respectively provided with a driving wheel groove and a locking disk groove which can contain the hand rocker arm.

And a handle lock hole is formed in the groove of the locking disc, and the size of the lock hole is matched with that of the handle.

Further, the hand rocker arm is arranged at the circle center of the driving wheel.

Furthermore, the gear is arranged in the gear box, and the rack penetrates through the gear box to enable the part of the rack, which is meshed with the gear, to be positioned in the gear box.

Furthermore, a plurality of locking disc grooves which are uniformly distributed are formed in the locking disc.

In order to realize the second purpose, the utility model provides a hand formula lift desk chair based on above-mentioned lift locking device, including the table leg, set up the lift locking device on the table leg of both sides respectively, each side table leg includes two stands, and the rack sets up on one of them stand, and the gear box sets up between two stands of table leg, and the gear box is fixed at the rack and pinion incasement, the lateral surface fixed connection of bearing frame and rack and pinion case.

Furthermore, the lower end of the gear rack box is connected with the movable foot leg sleeve into a whole, and the desk legs are sleeved in the movable foot leg sleeve.

And the outer side of the gear rack box is fixedly connected with the locking disc.

The utility model has the advantages that: the user can adjust the table and chair to the best comfortable sitting state according to the height of the user. The utility model discloses a transmission shaft and the main part system of table chair even as an organic whole, can freely go up and down along with table chair main part system. The utility model has simple structure and reasonable design; the appearance is concise, clean and clean; the operation is convenient, and the experience is comfortable; firm and durable, safe and reliable. The utility model discloses be particularly suitable for all kinds of schools teaching at different levels and use, also be fit for as desk and the desk in family and office. The utility model discloses, can dismantle the equipment, adopt a lot of standard parts, purpose-built part also can produce into standard accessories and sell, is convenient for change the maintenance, reduces extravagantly, resources are saved.

Drawings

FIG. 1 is a schematic view of the lifting of a desk and chair of the present invention;

FIG. 2 is a structural view of the fixing foot stool of the present invention;

FIG. 3 is a schematic structural view of a side plate assembly of the present invention;

FIG. 4 is a schematic view of the lifting and lowering operation principle of the rack and pinion of the present invention;

FIG. 5 is a schematic view of the transmission system of the present invention;

FIG. 6 is a schematic view of the lifting locking device of the present invention;

fig. 7 is a schematic view of the working principle of the lifting locking device of the present invention.

In the figure: 1-desk leg, 2-cross beam, 3-rack, 4-gear, 5-gear box, 6-side plate assembly, 7-movable foot-leg sleeve, 8-gear-rack box, 9-bearing seat, 10-gear-rack box sealing plate, 11-desk panel, 12-transmission shaft, 13-bearing, 14-driving wheel, 15-driving wheel groove, 16-locking disk, 17-locking disk groove, 18-hand-operated arm folding device, 19-hand-operated rocker arm, 20-handle, 21-handle and 22-lock hole.

Detailed Description

The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention.

It is to be understood that in the description of the present invention, the terms "longitudinal", "lateral", "top", "upper", "middle", "lower", "back", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or components referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be considered as limiting the present invention.

As shown in figure 1, a set of desk and chair comprises a desk and a chair, and the lifting locking structure and the lifting locking principle of the desk and chair are the same. Comprises a foot rest system (shown in figure 2), a table and chair main body system (shown in figures 3 and 4) and a gear rack lifting locking device (shown in figures 4-7).

As shown in fig. 2, the tripod system is made of steel and is formed by welding square steel tubes with rectangular cross sections. The desk legs 1 comprise a base and two ends of the base, each desk leg 1 is composed of two upright posts, and the tops of the two upright posts are fixed through a cross beam 2 to form a portal frame. The crossbeam 2 can be dismantled, and is equipped with the draw-in groove on the roof beam, and the top of table leg of being convenient for is fixed with the screw after imbedding the draw-in groove.

The gear rack lifting locking device is shown in figures 4-7. Comprises a rack 3 and a gear 4 meshed with the rack 3; two gears 4 are fixed at the positions of the transmission shaft 12 close to the two end parts, and the transmission shaft 12 is fixed at the central position of the gears 4, can be welded at the center of the gears or can be integrally formed.

The inner ring of the bearing 13 is fixed with the part of the transmission shaft 12 extending out of the gear 4, the bearing 13 is embedded into the bearing seat 9 and fixed, and the locking disc 16 is sleeved on the bearing seat 9, fixed on the outer wall of the side plate, namely the outer wall of the gear rack box 8 and can be welded.

The driving wheel 14 is arranged outside the bearing seat 9 and the locking disc 16, and is sleeved at the tail end of the transmission shaft 12 and fixed, a hand rocker arm 19 is arranged at the tail end of the transmission shaft 12, one end of the hand rocker arm 19 is connected with the tail end of the transmission shaft 12 penetrating through the center of the driving wheel 14 through a hand rocker arm folding device 18, and a handle 20 is arranged at the other end of the hand rocker arm 19.

The driving wheel 14 and the locking disk 16 are respectively provided with a driving wheel groove 15 and a locking disk groove 17 which can accommodate a hand rocker arm 19.

A handle locking hole 21 is formed in the locking disc groove 17, and the size of the locking hole 21 is matched with that of the handle 20.

The hand swing arm 19 is disposed on the end of the drive shaft 12 at the center of the drive wheel 14.

The gear 4 is arranged in the gear box 5, and the rack 3 penetrates through the gear box 5 to enable the part meshed with the gear 4 to be located in the gear box 5.

The lifting locking device is arranged on a desk or a chair to form the desk and chair of the utility model, and the concrete structure is shown in figures 1-4.

A rack 3 is arranged on one upright post of the table legs 1 at two sides of the table. The gear box 5 is internally provided with a gear 4, the gear 4 is perfectly meshed with the rack 3, the gear 5 is opened at one side close to the rack, the rack 3 is sleeved with the gear box 5, the part where the rack 3 is meshed with the gear 4 is positioned in the gear box 5, and meanwhile, lubricating grease in the gear box 5 can ensure the lubrication of the gear 4 and the rack 3 for a long time. The gear box 5 is fixed on the inner walls of two sides of the gear rack box 8. The rack and pinion box 8 has a rack and pinion box sealing plate 10 at the top, which may be made of steel, so as to fix the table top plate 11 with screws.

As shown in FIG. 3, the side plate assembly is a hollow whole with a middle upper part and is composed of four parts. The rack is a rectangular box body, namely a gear rack box 8, and a gear 4 moves up and down in the box body along a rack 3; two movable foot leg sleeves 7 are communicated with a gear rack box 8; a rack and pinion box sealing plate 10 for sealing the top of the rack and pinion box 8 and connecting and fixing the desktop plate 11; fourthly, the decorative plate can be made of ABS material except for the gear rack box 8 and the movable leg sleeve 7; the decorative plate can also be a complete side plate and is fixedly connected with the outer side walls of the gear rack box 8 and the movable leg sleeve 7, and the fixed connection can adopt the existing connection modes such as bonding, screw connection and the like. The gear rack box 8, the movable leg sleeve 7 and the closing plate 10 are made of steel. The gear rack box 8 and the movable leg sleeve 7 form a side plate framework through welding, and the inner spaces of the side plate framework and the movable leg sleeve are communicated; the gear rack box sealing plate 10 and the ABS decorative plate are connected with the side plate framework through screws. Round holes are formed in corresponding positions of two side wall positions of a gear rack box 8 of the side plate, a bearing seat 9 is welded at the round hole position of the outer side wall, and a transmission shaft 12 penetrates through the bearing seat 9 and the round holes. The movable leg sleeve 7 is a square steel tube with a rectangular cross section, the movable leg sleeve 7 is sleeved on the table leg 1 according to the corresponding direction, and the installation is carried out according to the mode of figures 2-4.

The gear box 5 moves up and down along the rack 3 along with the gear 4, and drives the gear rack box 8 to freely and smoothly do lifting motion along the table leg 1 through the transmission shaft 12, and simultaneously drives the side plate 6 to do lifting motion together through the transmission shaft 12, so as to realize the height adjustment of the table and chair.

Two circular holes are respectively formed in two side walls of the gear rack box 8, a bearing seat 9 is arranged at the circular hole on the outer side wall of the gear rack box 8 (for example, the bearing seat is welded on the outer side wall), and a bearing 13 is embedded into the bearing seat 9 and fixed to allow a transmission shaft 12 to pass through. The outer wall of the circular ring of the bearing seat 9 is fixed with the inner wall of the circular ring of the locking disc 16; the driving wheel 14 is arranged on the outer side of the bearing seat 9 and the locking disc 16, sleeved and fixed at the tail end of the transmission shaft 12, a hand rocker arm 19 is arranged at the tail end of the transmission shaft 12 at the center of the driving wheel 14, one end of the hand rocker arm 19 is connected with the tail end of the transmission shaft 12 through a hand rocker arm folding device 18, the other end of the hand rocker arm is provided with a handle 20, and the handle 20 is perpendicular to the hand rocker arm 19; the driving wheel 14 and the locking disk 16 are respectively provided with a driving wheel groove 15 and a locking disk groove 17 which can accommodate a hand rocker arm 19; a handle lock hole 21 is formed in the lock disc groove 17, and the size of the handle lock hole 21 is matched with that of the handle 20. The hand cranking arm folding device 18 can be realized by the existing folding technology, as shown in fig. 3-6.

The table top plate 11 is made of ABS materials. The drawer 22 is installed in a space between the driving shaft 12 and the table top 11 and can be fixed by some conventional means, such as a sliding rail. The drawer can also be designed into different styles according to different requirements. As shown in fig. 4. The drawer 22 is made of ABS materials, the clearance height from the transmission shaft to the desktop is 20-25 cm, and the drawer is large enough.

The driving wheel 14 is a disc with a groove at the diameter, a hole with the same diameter as the transmission shaft 12 is formed at the circle center, the driving wheel is sleeved and fixed at the tail end of the transmission shaft 12, and the driving wheel 14 and the transmission shaft 12 freely rotate under the power action of the handle 20 and the hand-cranking arm 19. The outer side of the driving wheel 14 passes through a driving wheel groove 15 with a diameter, and can be embedded into one end of a corresponding hand rocker arm 19. (as shown in fig. 6).

The locking disk 16 is a broad-edged ring concentric with the bearing seat. The inner wall of the circular ring of the locking disc 16 is fixed on the outer wall of the circular ring of the bearing seat, and the whole locking disc 16 is fixed on the outer side plate of the gear rack box 8. And a locking disc groove 17 passing through the center of a circle is formed in each of 8 directions on the circular ring of the locking disc 16, the width and the depth of each groove are consistent with those of the grooves in the driving wheel 14, and the grooves can be embedded into the other end of the hand rocker arm. Every recess is equipped with handle lockhole 21 by ring outer fringe end, install two elastic steel wires in the handle lockhole 21 for block handle 20. (as shown in fig. 6).

And a secondary lock for assisting the locking and strengthening is arranged at the other end of the table and chair, and the installation position of the secondary lock can be interchanged with the positions of the driving wheel 14 and the locking disc 16 according to the requirement of arranging the table and chair in a classroom. The secondary locking device is constructed on the same principle as the primary wheel 14 and the locking disk 16, but is smaller in size. The length of the auxiliary locking rocker arm 19 is correspondingly shorter, and the auxiliary locking rocker arm only plays an auxiliary role in lifting operation and plays a reinforcing role in locking.

(as shown in fig. 5).

The embodiment of the utility model provides an in, the theory of operation of desk with rack and pinion elevating gear is: when the lifting device is in a locked state, the handle 20 is pulled out from the handle lock hole 21, and the hand rocker arm 19 is embedded into the other half section of the driving wheel groove 15 on the driving wheel 14 (as shown in fig. 7-1). The handle 20 is held to make a circular motion with the center of the driving wheel 14, i.e. the end of the transmission shaft 12, as the center of the circle, and the hand rocker arm 19 embedded in the driving wheel groove 15 drives the driving wheel 14 and the transmission shaft 12 to rotate synchronously. Because the transmission shaft 12 penetrates through the side plate 6 and is connected through the bearing 13, the bearing 13 is embedded into the bearing seat 9 and is fixed with the bearing seat 9, the bearing seat 9 is welded on the outer wall of the rack and pinion box 8, the driving wheel 14 is arranged on the outer sides of the bearing seat 9 and the locking disc 16 and is sleeved at the tail end of the transmission shaft 12 and is fixed, when the handle 20 is held to rotate, the hand rocker arm 19 drives the driving wheel and the transmission shaft 12 to rotate, the rotating outer ring of the inner ring of the bearing 13 does not rotate, the side plate 6 does not rotate, the locking disc 16 fixed on the outer walls of the circular rings of the side plate 6 and the bearing seat 9 does not rotate, the transmission shaft 12 has small rotating friction force, and hand cranking is easy; since the transmission shaft 12 passes through the gear 4 and the gear 4 is fixed on the transmission shaft 12, when the handle 20 is held to rotate, the transmission shaft 12 rotates, and the gear 4 rotates synchronously with the transmission shaft 12; since the gear 4 is perfectly meshed with the rack 3, when the handle 20 is held to rotate, the transmission shaft 12 rotates, the gear 4 and the transmission shaft 12 rotate synchronously, and the gear 4 moves up and down along the rack 3; and the transmission shaft 12 passes through the driving wheel 14, the round hole and the bearing seat 9 on the side plate 6, the gear box 5 and the gear 4, so that when the handle 20 is held and rotated and the gear 4 does lifting motion along the rack 3, the transmission shaft 12, the driving wheel 14, the side plate 6 and the gear box 5 in the box body 8 of the side plate 6 are lifted synchronously along with the gear 4, and the table top and the drawer fixed on the two side plates are lifted together. (as shown in FIG. 4)

The following are specifically mentioned: the bearing 13 is used for connecting the transmission shaft 12 and the side plate 6 assembly and reducing the friction force when the transmission shaft 12 rotates. The lifting of the side plate 6 and the table top 11 is realized by driving the transmission shaft 12 and the gear 4 to rotate through the hand-cranking arm 19 and the driving wheel 14. The gear 4 on the transmission shaft 12 rotates, and the gear 4 makes up-and-down linear motion on the rack 3, so that the gear box 5, the transmission shaft 12, the side plate assembly 6 and the table top 11 are driven to synchronously make lifting motion.

When the table and chair is lifted to a proper height, locking is needed. At this time, the hand rocker arm 18 is pulled out from the half section of the groove 15 embedded in the driving wheel 14 and is embedded into the original half section of the groove 15 on the driving wheel 14, meanwhile, the thick half section of the hand rocker arm 19 is embedded into the corresponding groove 17 on the locking disk 16, the handle 20 is buckled into the handle lock hole 21, and the two elastic steel wires in the handle lock hole 21 clamp the handle to realize firm locking (as shown in fig. 7-2). The hand rocker arm 19 on the drive wheel 14 has two functions: both as a power arm and as a locking arm.

The utility model discloses a lifting range: when the height of the table is reduced to the lowest level, the height of the table is about 65cm, and when the height of the table is increased to the highest level, the height of the table is about 90 cm. The chair can be lifted up and down reasonably according to the proportion.

Although the present invention has been described in detail with reference to the specific embodiments, the present invention is not limited to the above embodiments, and various changes and modifications without inventive faculty can be made without departing from the spirit and the principle of the present invention within the knowledge scope of those skilled in the art.

Claims (7)

1. The utility model provides a rack and pinion lift locking device which characterized in that: comprises a rack (3) and a gear (4) meshed with the rack (3); two gears (4) are fixed at the positions of the transmission shaft (12) close to the two end parts, and the transmission shaft (12) is fixed at the central position of the gears (4);

the inner ring of the bearing (13) is fixed with the part of the transmission shaft (12) extending out of the gear (4), the bearing (13) is embedded and fixed in the bearing seat (9), and the bearing seat (9) is embedded in the locking disc (16);

a driving wheel (14) is arranged on the outer side of the bearing seat (9) and the locking disc (16), is sleeved on the tail end of the transmission shaft (12) and is fixed, a hand rocker arm (19) is arranged on the tail end of the transmission shaft (12) in the center of the driving wheel (14), one end of the hand rocker arm (19) is connected with the tail end of the transmission shaft (12) through a hand rocker arm folding device (18), and the other end of the hand rocker arm is provided with a handle (20);

a driving wheel groove (15) and a locking disc groove (17) which can contain a hand rocker arm (19) are respectively arranged on the driving wheel (14) and the locking disc (16);

a handle lock hole (21) is formed in the groove (17) of the locking disc, and the size of the lock hole (21) is matched with that of the handle (20).

2. The rack and pinion lift lock of claim 1 wherein: the hand rocker arm (19) is arranged at the tail end of the transmission shaft (12) at the circle center of the driving wheel (14).

3. The rack and pinion lift lock of claim 1 wherein: the gear (4) is arranged in the gear box (5), and the rack (3) penetrates through the gear box (5) to enable the part meshed with the gear (4) to be located in the gear box (5).

4. The rack and pinion lift lock of claim 1 wherein: the locking disc (16) is provided with a plurality of locking disc grooves (17) which are arranged over the center of a circle and are evenly distributed.

5. Desk and chair based on a lifting locking device according to any of claims 1-4, comprising legs (1), characterized in that: the table leg lifting device is characterized by further comprising lifting locking devices respectively arranged on the table legs (1) on the two sides, each table leg (1) on each side comprises two stand columns, a rack (3) is arranged on one of the stand columns, a gear box (5) is arranged between the two stand columns of the table legs (1), the gear box (5) is fixed in a gear and rack box (8), and a bearing seat (9) is fixedly connected with the outer side wall of the gear and rack box (8).

6. The desk and chair based on the lifting locking device as claimed in claim 5, wherein: the lower end of the gear rack box (8) is connected with the movable foot leg sleeve (7) into a whole, and the desk legs (1) are sleeved in the movable foot leg sleeve (7).

7. The desk and chair based on the lifting locking device as claimed in claim 5, wherein: the outer side of the gear rack box (8) is fixedly connected with the locking disc (16).

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