CN210643298U

CN210643298U - Lifting device and rocking chair frame thereof

Info

Publication number: CN210643298U
Application number: CN201921177641.9U
Authority: CN
Inventors: 贾叶; 李青石; 沈海智
Original assignee: MASTER BABY PRODUCTS Co Ltd
Current assignee: MASTER BABY PRODUCTS Co Ltd
Priority date: 2019-07-24
Filing date: 2019-07-24
Publication date: 2020-06-02
Anticipated expiration: 2029-07-24

Abstract

The utility model discloses a lifting device, which comprises a foot rod and a rotary adjusting device, wherein the side wall of the foot rod is provided with a plurality of tooth levels; a rotary adjusting device is connected on the foot rod in a penetrating way; the rotary adjusting device comprises a short pipe for penetrating the foot rod, a foot rod penetrating through hole is arranged in the short pipe, the foot rod with a gear level penetrates in the foot rod penetrating through hole, the lock catch piece penetrates on the bayonet to be in a locking state through the matching coordination of the upper gear, the lower gear and the knob, the height is fixedly adjusted, and the lock catch piece descends away from the bayonet to be in an unlocking state; after the locking piece is unlocked, the knob is screwed by hand to rotate, the knob and the locking piece synchronously rotate, the upper gear is driven to rotate synchronously, the upper gear synchronously drives the lower gear to rotate, and the lower gear moves up and down on the foot rod by taking the gear level as a basis to realize lifting height adjustment.

Description

Lifting device and rocking chair frame thereof

Technical Field

The utility model relates to a rocking chair accessory specifically is a be applied to elevating gear of rocking chair and rocking chair frame thereof.

Background

A plurality of existing infant seats and rocking chairs are provided with adjusting and adjusting devices, however, in order to save cost, the height required by the combination adjustment and locking of an elastic lock pin and a lock hole is mostly adopted, and the height is unlocked by pressing the elastic lock pin, so that the infant seat is simple in structure, can shake a little when being used, and is not stable and firm enough.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a be applied to elevating gear of rocking chair that structure is durable, stability in use is strong.

A lifting device comprises a foot rod and a rotary adjusting device, wherein the side wall of the foot rod is provided with a plurality of tooth levels; the foot rods are connected with a rotary adjusting device in a penetrating way; the rotary adjusting device comprises a short pipe for connecting the foot rod in a penetrating way, the foot rod is connected with a through hole in the short pipe in a penetrating way, and the foot rod with the tooth level is connected in the through hole of the foot rod in a penetrating way; a rear shell extends from the outer side wall of the short pipe, an upper gear cavity is arranged on one side of the rear shell, a lower gear cavity is arranged on the lower side of the other side of the rear shell, and a gear sharing through hole is formed between the lower gear cavity and the upper gear cavity; a gear protruding through hole is formed between the lower gear cavity and the foot rod penetrating through hole;

the middle of the upper gear cavity is provided with a first screw hole; the upper gear cavity is provided with a knob, an upper gear extends from the axial inner side wall of the knob, a positioning step is arranged between the upper gear and the knob, the upper gear is arranged in the upper gear cavity, the knob is exposed out of the cavity opening of the upper gear cavity, and the positioning step of the knob is embedded in the opening edge of the cavity opening; the radial side wall of the knob is provided with a lock catch piece mounting hole, and a lock catch piece is mounted on the lock catch piece mounting hole; the wall body of the rear shell piece is provided with a bayonet which is positioned at the edge of the wall body of the upper gear cavity, and the lock tongue of the lock catch piece is inserted into the bayonet to form a locking whole; a concave part is arranged on the axial outer side wall of the knob, a screw hole II is arranged in the middle of the concave part, and the screw hole II axially penetrates through the knob and the upper gear; a spring supporting piece is arranged in the concave part, a return pressure spring is connected to the spring supporting piece, one end of the return pressure spring is pressed against the spring supporting piece, and the other end of the return pressure spring is pressed against the lock catch piece; the first screw hole and the second screw hole are fixedly connected with a long screw in a transverse mode, and the knob is twisted and rotated by taking the long screw as an axis core; a knob cover is connected to the notch of the concave part;

a lower gear is arranged in the lower gear cavity, a lower gear shaft core transversely penetrates through the middle of the lower gear, two ends of the lower gear shaft core are fixed between the left side wall and the right side wall of the lower gear cavity, and the lower gear shaft core below the lower gear rotates as the shaft core; the lower gear is meshed with the gear stage;

the lower gear is in gear fit connection with the upper gear; the locking fastener is connected to the bayonet in a penetrating mode and is in a locking state, the height is adjusted fixedly, and the locking fastener falls off the bayonet and is in an unlocking state; after the locking piece is unlocked, the knob is screwed by hand to rotate, the knob and the locking piece synchronously rotate, the upper gear is synchronously driven to rotate, the upper gear synchronously drives the lower gear to rotate, and the lower gear enables the rotary adjusting device to move up and down on the foot rod on the basis of the gear level to realize the adjustment of the lifting height.

Further: the lock catch piece comprises a pressing column, a lock tenon extends from the root of the pressing column, the lock tenon is shorter than the pressing column, and the pressing column and the lock tenon are integrally formed; the positioning step is provided with a lock tenon through hole; the pressing column penetrates through the installation hole of the lock catch piece, the lock tenon penetrates through the lock tenon penetrating hole, the lock tenon penetrates through the bayonet to be in a locking state, the lock tenon descends to leave the bayonet to be in an unlocking state, the reset pressure spring is pressed on the pressing column in a propping mode, and the pressing column and the lock tenon are lifted synchronously under the elastic property of the reset pressure spring.

Further: the top and the bottom of the rear shell piece are respectively provided with a bayonet, and the bayonets are two bayonets, namely an upper bayonet and a lower bayonet, are positioned on the edge of the wall body of the upper gear cavity and are locked by two gears.

Further: the rear side wall of the foot rod is connected with a long rack, and a plurality of tooth levels are arranged on the long rack.

The utility model discloses a lifting device's advantage does: the locking fastener of the product is in a locking state after penetrating through the bayonet, the height is fixedly adjusted, and the locking fastener falls off the bayonet and is in an unlocking state; after the locking piece is unlocked, the knob is screwed by hand to rotate, the knob and the locking piece synchronously rotate, the upper gear is driven to rotate synchronously, the upper gear synchronously drives the lower gear to rotate, and the lower gear moves up and down on the foot rod by taking the gear level as a basis to realize lifting height adjustment.

Drawings

Fig. 1 is a schematic structural view of a rotary adjusting lifting device of the utility model;

fig. 2 and 3 are exploded views of the rotary adjusting device of the present invention;

fig. 4 and 5 are perspective views of an integrally formed product of a gear, a knob and a positioning step of the utility model;

fig. 6, 7, 8 and 9 are perspective views of the rotary adjusting device of the present invention;

FIG. 10 is a cross-sectional view of a product rotation adjustment device of the present invention;

fig. 11 is a sectional view of the rotary adjusting lifting device of the present invention;

FIG. 12 is a perspective view of a product employing a rotary adjustable lift device;

fig. 13, 14 and 15 are schematic diagrams of the product turnover folding process by applying the rotary adjusting lifting device.

Detailed Description

A kind of lifting gear, the lifting gear includes foot lever A and rotary regulating device B, the foot lever A is made of metal pipe, preferably choose the square tube or flat tube; a limiting block can be arranged at the lower section of the foot rod A to prevent the rotary adjusting device B from descending in a transition mode, and a limiting block can be arranged at the top end of the foot rod A to prevent the rotary adjusting device B from ascending in a transition mode to be separated; the side wall of the foot rod A is provided with a plurality of tooth levels A1; a rotary adjusting device B is connected to the foot rod A in a penetrating manner; the rotary adjusting device B comprises a short pipe 1 for penetrating through the foot rod, a foot rod penetrating through hole 11 is arranged in the short pipe 1, and a foot rod A with a tooth level penetrates through the foot rod penetrating through hole 11 (the rod body shape of the foot rod A is the same as that of the foot rod penetrating through hole 11, the foot rod A is just suitable for penetrating into the foot rod penetrating through hole 11, and the foot rod A cannot be loosened after penetrating into the foot rod penetrating through hole 11 due to certain length and pipe internal area of the short pipe); a rear shell 2 extends behind the outer side wall of the short pipe 1, an upper gear cavity 21 is arranged on one side of the rear shell 2, a lower gear cavity 22 is arranged on the lower side of the other side of the rear shell, and a gear sharing through hole 23 is arranged between the lower gear cavity 22 and the upper gear cavity 21; a gear protruding through hole 24 is arranged between the lower gear cavity 22 and the foot rod through hole 11;

a first screw hole 25 is formed in the middle of the cavity bottom of the upper gear cavity 21; the upper gear cavity 21 is provided with a knob 26, an upper gear 261 extends from the axial inner side wall of the knob 26, a positioning step 262 is arranged between the upper gear 261 and the knob 26, the upper gear 261 is arranged in the upper gear cavity 21, the knob 26 is exposed out of the cavity opening of the upper gear cavity 21, the positioning step 262 of the knob 26 is embedded in the opening edge of the cavity opening, the upper gear cavity 21, the knob 26, the upper gear 261 and the positioning step 262 are all circular, the diameter of the positioning step 262 is slightly smaller than that of the opening edge in the upper gear cavity 21, and the positioning step 262 can be just embedded in the opening edge of the upper gear cavity 21 and is used for positioning and twisting the knob to rotate; a locking piece mounting hole 263 is formed in the radial outer side wall of the knob 26, and a locking piece 27 is mounted on the locking piece mounting hole 263; the top wall body of the rear shell part 2 is provided with a bayonet 28, the bayonet 28 is positioned at the edge of the wall body of the upper gear cavity 21 (the bayonet can be replaced by a clamping hole), and the lock tongue of the lock catch part 27 is inserted into the bayonet 28 to form a locking whole; the axial outer side wall of the knob 26 is provided with a concave part 29, the middle of the concave part 29 is provided with a screw hole two 291, the screw hole two 291 axially penetrates through the knob 26 and the upper gear 261, and the knob 26 and the upper gear 261 are integrally formed; a spring support 292 is arranged in the concave part 29, the spring support 292 is a rectangular groove (a rectangular groove is formed on the peripheral edge of three-side protrusion), the spring support 292 is connected with a return pressure spring 30, one end of the return pressure spring 30 is pressed against the spring support 292 (the lower end of the return pressure spring 30 is pressed against the bottom of the rectangular groove, the lock catch piece 27 is arranged in the rectangular groove, the rectangular groove can prevent the lock catch piece 27 and the return pressure spring 30 from deviating, so that the lock catch piece 27 moves up and down in the rectangular groove), and the other end of the return pressure spring is pressed against the lock catch piece 27; the screw hole I25 and the screw hole II 291 jointly transversely and fixedly connect with a long screw 293 (the two ends of the long screw 293 are tightened by nuts or the long screw is replaced by a long rivet, and the long screw is penetrated and connected with the long rivet and then is punched and formed into a screw cap at the two ends for fixing; a knob cover 211 is connected to the notch of the concave part 29;

a lower gear 221 is arranged in the lower gear cavity 22, a lower gear shaft core 222 is arranged in the middle of the lower gear 221, the lower gear 221 is connected to the lower gear shaft core 222 in a penetrating manner, two ends of the lower gear shaft core 222 are fixed in the middle of the left side wall and the right side wall of the lower gear cavity 22, the lower gear shaft core 222 is fixed, and the lower gear 22 rotates by taking the lower gear shaft core 222 as a center shaft; the lower gear 221 is meshed with the gear stage A1 (the lower gear 221 extends convex teeth into the foot rod through hole 11 through the gear convex through hole 24 to be meshed with the gear stage A1);

the prior technical scheme is as follows: the outer side of the lower gear cavity 22 is connected with a cavity cover 201, the middle of the bottom of the lower gear cavity 22 protrudes a lower gear shaft core 222, the lower gear 221 is connected to the lower gear shaft core 222 in a penetrating mode, the lower gear 221 is arranged in the lower gear cavity 22, a nail penetrating hole is formed in the middle of the lower gear shaft core 222, a nail body penetrates through the nail penetrating hole in one side, the nail penetrating hole penetrates out of the nail hole in the cavity cover 201, the nail head is fixed through riveting, therefore, the cavity cover 201 seals the cavity opening of the lower gear cavity 22, the lower gear 221 is prevented from falling out through the cavity cover 201, the cavity cover 201 is fixedly connected to the rear shell part 2, and the lower gear 221 is suspended in the lower gear cavity 22 through the lower gear shaft core 222.

The lower gear 221 is in meshed connection with the upper gear 261 (the lower gear 221 is meshed with the upper gear 261 through a gear sharing through hole 23, and the gear sharing through hole 23 is used as a common area for the meshed contact of the two gears); the lock catch piece 27 is in a locking state after penetrating (falling) on the bayonet 28, the height is fixedly adjusted, and the lock catch piece 27 is pressed by hands to fall off the bayonet 28 to be in an unlocking state; after the locking piece 27 is unlocked, the knob 26 is screwed by hand to rotate, the knob 26 and the locking piece 27 synchronously rotate, the knob 26 and the upper gear 261 are integrated, so that the upper gear 261 is synchronously driven to rotate, the upper gear 261 synchronously drives the lower gear 221 to rotate, and the lower gear 221 enables the rotary adjusting device B to move up and down on the foot rod A on the basis of the gear level A1 to realize lifting height adjustment. When the rotary adjusting device B descends, the upper end of the foot rod A1 penetrates out of the upper part of the foot rod through hole 11 of the short pipe.

The preferred scheme is as follows: the lock catch 27 comprises a pressing column 271 (the pressing column 271 is equivalent to an unlocking key), a lock tongue 271 extends from the root of the pressing column 271, the lock tongue is shorter than the pressing column, and the pressing column 271 and the lock tongue 272 are integrally formed; a lock tenon through hole 62A is formed in the positioning step 262; the pressing column 271 is connected to the locking piece mounting hole 263 in a penetrating manner, the locking tenon 271 is connected to the locking tenon connecting hole 62A in a penetrating manner, the locking tenon 272 is connected (dropped) to the bayonet 28 in a penetrating manner to be in a locking state, the locking tenon 272 descends away from the bayonet 28 to be in an unlocking state (the locking tenon 272 is in an unlocking state after being pressed and retracted by the pressing column 271), the return pressure spring 30 is pressed against the pressing column 271, and the pressing column 271 and the locking tenon 272 are lifted synchronously by the elastic property of the return pressure spring 30.

The top and the bottom of the rear shell 2 are provided with bayonets 28, which are two bayonets, one bayonet is arranged above the other bayonet, and the bayonets are located on the edge of the wall body of the upper gear cavity and are locked by two gears. If the bayonet is one bayonet, one rotation is a first gear, and if the two bayonets rotate for half a circle, the first gear is the second gear; the knob is rotated 360 degrees. If the bayonet is provided with a plurality of multi-gear adjustment.

The rear side wall of the foot rod A is connected with a long rack A10, and a plurality of tooth levels A1 are arranged on the long rack A10.

A rocking chair frame comprises a floor arc-shaped frame 1A, wherein the front end and the rear end of the floor arc-shaped frame 1A are tilted, the arc point with the lowest middle falls on the floor, and the rocking chair frame is rocked back and forth through the floor arc-shaped frame; the left side and the right side of the front end of the landing arc-shaped frame 1A are both connected with joints 1B, the joints on the left side and the right side are both connected with lifting devices, and the lifting devices on the left side and the right side are identical in structure and are in mirror symmetry; the lifting devices on the left side and the right side respectively comprise a foot rod A and a rotary adjusting device B, the side wall of the foot rod A is provided with a plurality of tooth levels A1, and the bottom end of the foot rod A is fixedly connected with the joint 1B; the foot rod is connected with a rotary adjusting device B in a penetrating way; the rotary adjusting device B comprises a short pipe 1 for penetrating through a foot rod, a foot rod penetrating through hole 11 is arranged in the short pipe 1, the foot rod A with a tooth level penetrates through the foot rod penetrating through hole 11, the shape of the rod body of the foot rod A is the same as that of the foot rod penetrating through hole 11, the foot rod A is just suitable for penetrating into the foot rod penetrating through hole 11, and the foot rod A cannot be loosened after penetrating into the foot rod penetrating through hole 11 due to the fact that the short pipe has certain length and pipe inner area (for example, the short pipe is 10-15 cm); a rear shell 2 extends from the outer side wall of the short pipe 1, an upper gear cavity 21 is arranged on one side of the rear shell 2, a lower gear cavity 22 is arranged on the lower side of the other side of the rear shell, and a gear sharing through hole 23 is arranged between the lower gear cavity 22 and the upper gear cavity 21; a gear protruding through hole 24 is arranged between the lower gear cavity 22 and the foot rod through hole 11; the upper end of the short pipe 1 is connected with a hollow pipe 101, and the upper ends of the hollow pipes 101 at the left side and the right side are connected (hinged) with a seat frame 102; a first screw hole 25 is formed in the middle of the upper gear cavity 21; the upper gear cavity 21 is provided with a knob 26, an upper gear 261 extends from the axial inner side wall of the knob 26, a positioning step 262 is arranged between the upper gear 261 and the knob 26, the upper gear 261 is arranged in the upper gear cavity 21, the knob 26 is exposed out of the cavity opening of the upper gear cavity, the positioning step 262 of the knob 26 is embedded in the opening edge of the cavity opening, the upper gear cavity 21, the knob 26, the upper gear 261 and the positioning step 262 are all circular, the diameter of the positioning step 262 is slightly smaller than that of the opening edge in the upper gear cavity 21, and the positioning step 262 can be just embedded in the opening edge of the upper gear cavity 21 and is used for positioning and twisting the knob to rotate; a locking piece mounting hole 263 is formed in the radial outer side wall of the knob 26, and a locking piece 27 is mounted on the locking piece mounting hole 263; a bayonet 28 is arranged on the top wall body of the rear shell part 2, the bayonet 28 is positioned on the edge of the wall body of the upper gear cavity 21, and the lock tongue of the lock catch part 27 is inserted into the bayonet 28 to form a locking whole; the axial outer side wall of the knob 26 is provided with a concave part 29, the middle of the concave part is provided with a screw hole two 291, and the screw hole two 291 axially penetrates through the knob and the upper gear 261; a spring support 292 is arranged in the concave part 29, a return pressure spring 30 is connected to the spring support 292, one end of the return pressure spring 30 is pressed against the spring support 292, and the other end of the return pressure spring is pressed against the locking piece 27; the screw hole I25 and the screw hole II 291 jointly transversely and fixedly connect with a long screw 293, and the knob 26 rotates by twisting by taking the long screw 293 as an axis core; a knob cover 211 is connected to the notch of the concave part 29; the positioning step 262 is embedded in the opening edge of the upper gear cavity 21 to play a role in centering; a lower gear 221 is arranged in the lower gear cavity 22, a lower gear shaft core 222 is arranged in the middle of the lower gear 221, the lower gear 221 is connected to the lower gear shaft core 222 in a penetrating manner, two ends of the lower gear shaft core 222 are fixed in the middle of the left side wall and the right side wall of the lower gear cavity 22, and the lower gear 221 rotates by taking the lower gear shaft core 222 as a shaft core; the lower gear 221 is meshed with the gear stage A1 (the lower gear 221 extends convex teeth into the foot rod through hole 11 through the gear convex through hole 24 to be meshed with the gear stage A1); the lower gear 221 is in meshed connection with the upper gear 261 (the lower gear 221 is meshed with the upper gear 261 through a gear sharing through hole 23, and the gear sharing through hole 23 is used as a common area for the meshed contact of the two gears); the lock catch 27 comprises a pressing column 271, the root of the pressing column 271 extends to form a lock tongue 272, the lock tongue is shorter than the pressing column, and the pressing column and the lock tongue are integrally formed; a lock tenon through hole 62A is formed in the positioning step 262; the pressing column 271 is connected to the locking piece mounting hole 263 in a penetrating manner, the locking tenon 271 is connected to the locking tenon connecting hole 62A in a penetrating manner, the locking tenon 272 is connected (falls) to the bayonet 28 in a penetrating manner to be in a locking state, the locking tenon 272 descends away from the bayonet 28 to be in an unlocking state (the locking tenon 272 is in an unlocking state after being pressed and retracted by the pressing column 271), the resetting pressure spring 30 is pressed against the pressing column, and the pressing column and the locking tenon are lifted synchronously under the elastic property of the resetting pressure spring; after the locking fastener 27 is pressed for unlocking, the knob 26 is screwed by hand to rotate, the knob 26 and the locking fastener 27 synchronously rotate, the upper gear 261 is synchronously driven to rotate, the upper gear 261 synchronously drives the lower gear 221 to rotate, and the lower gear 221 enables the rotary adjusting device B to move up and down on the foot rod A on the basis of the tooth level A1 to realize lifting height adjustment; when the rotary adjusting device B descends, the foot rod A is inserted into the hollow tube 101, when the foot rod A reaches a limiting piece arranged at the top in the hollow tube, the foot rod A is jacked and cannot move upwards any more, and the rotary adjusting device B stops moving downwards; the rotation adjusting device B is lifted to raise the seat frame 102 (an upward limiting member/an upward limiting mechanism is provided at the top end of the leg rod a or at the side wall of the short pipe 1, and when the rotation knob of the rotation adjusting device B is lifted to touch the upward limiting member/the upward limiting mechanism, the upward movement is terminated), and conversely, the rotation adjusting device B is lowered to lower the seat frame 102.

The preferred scheme is as follows: the top and the bottom of the rear shell 2 are provided with bayonets 28, which are two bayonets, one bayonet is arranged above the other bayonet, and the bayonets are located on the edge of the wall body of the upper gear cavity and are locked by two gears. If the bayonet is one bayonet, one rotation is a first gear, and if the two bayonets rotate for half a circle, the first gear is the second gear; the knob is rotated 360 degrees. If the bayonet is provided with a plurality of multi-gear adjustment.

The preferred scheme is as follows: the rear side wall of the foot rod A is connected with a long rack A10, and a plurality of tooth levels A1 are arranged on the long rack A10.

The preferred scheme is as follows: the joint is a hinged rotary folding joint, and the floor arc-shaped frame can be hinged and folded towards the seat frame through the hinged rotary folding joint.

Claims

1. A lifting device is characterized in that: the lifting device comprises a foot rod and a rotary adjusting device, and the side wall of the foot rod is provided with a plurality of tooth levels; the foot rods are connected with a rotary adjusting device in a penetrating way; the rotary adjusting device comprises a short pipe for connecting the foot rod in a penetrating way, the foot rod is connected with a through hole in the short pipe in a penetrating way, and the foot rod with the tooth level is connected in the through hole of the foot rod in a penetrating way; a rear shell extends from the outer side wall of the short pipe, an upper gear cavity is arranged on one side of the rear shell, a lower gear cavity is arranged on the lower side of the other side of the rear shell, and a gear sharing through hole is formed between the lower gear cavity and the upper gear cavity; a gear protruding through hole is formed between the lower gear cavity and the foot rod penetrating through hole;

the middle of the upper gear cavity is provided with a first screw hole; the upper gear cavity is provided with a knob, an upper gear extends from the axial inner side wall of the knob, a positioning step is arranged between the upper gear and the knob, the upper gear is arranged in the upper gear cavity, the knob is exposed out of the cavity opening of the upper gear cavity, and the positioning step of the knob is embedded in the opening edge of the cavity opening; the radial outer side wall of the knob is provided with a lock catch piece mounting hole, and a lock catch piece is mounted on the lock catch piece mounting hole; the wall body of the rear shell piece is provided with a bayonet which is positioned at the edge of the wall body of the upper gear cavity, and the lock tongue of the lock catch piece is inserted into the bayonet to form a locking whole; a concave part is arranged on the axial outer side wall of the knob, a screw hole II is arranged in the middle of the concave part, and the screw hole II axially penetrates through the knob and the upper gear; a spring supporting piece is arranged in the concave part, a return pressure spring is connected to the spring supporting piece, one end of the return pressure spring is pressed against the spring supporting piece, and the other end of the return pressure spring is pressed against the lock catch piece; the first screw hole and the second screw hole are fixedly connected with a long screw in a transverse mode, and the knob is twisted and rotated by taking the long screw as an axis core; a knob cover is connected to the notch of the concave part;

a lower gear is arranged in the lower gear cavity, a lower gear shaft core is arranged in the middle of the lower gear, the lower gear is connected to the lower gear shaft core in a penetrating manner, two ends of the lower gear shaft core are fixed in the middle of the left side wall and the right side wall of the lower gear cavity, and the lower gear rotates with the lower gear shaft core as the shaft core; the lower gear is meshed with the gear stage;

the lower gear is in gear fit connection with the upper gear; the lock catch piece is connected to the bayonet in a penetrating mode and is in a locking state, the height is adjusted fixedly, and the lock catch piece descends away from the bayonet and is in an unlocking state; after the locking piece is unlocked, the knob is screwed by hand to rotate, the knob and the locking piece synchronously rotate, the upper gear is synchronously driven to rotate, the upper gear synchronously drives the lower gear to rotate, and the lower gear enables the rotary adjusting device to move up and down on the foot rod on the basis of the gear level to realize the adjustment of the lifting height.

2. A lifting device as claimed in claim 1, characterized in that: the lock catch piece comprises a pressing column, a lock tenon extends from the root of the pressing column, the lock tenon is shorter than the pressing column, and the pressing column and the lock tenon are integrally formed; the positioning step is provided with a lock tenon through hole; the pressing column penetrates through the installation hole of the lock catch piece, the lock tenon penetrates through the lock tenon penetrating hole, the lock tenon penetrates through the bayonet to be in a locking state, the lock tenon descends to leave the bayonet to be in an unlocking state, the reset pressure spring is pressed on the pressing column in a propping mode, and the pressing column and the lock tenon are lifted synchronously under the elastic property of the reset pressure spring.

3. A lifting device as claimed in claim 2, characterized in that: the top and the bottom of the rear shell piece are respectively provided with a bayonet, and the bayonets are two bayonets, namely an upper bayonet and a lower bayonet, are positioned on the edge of the wall body of the upper gear cavity and are locked by two gears.

4. A lifting device as claimed in claim 1, characterized in that: the rear side wall of the foot rod is connected with a long rack, and a plurality of tooth levels are arranged on the long rack.