CN110897379A

CN110897379A - Production process of multifunctional bookshelf

Info

Publication number: CN110897379A
Application number: CN201911045477.0A
Authority: CN
Inventors: 罗炳林
Original assignee: Guangzhou Song Jia Household Products Co Ltd
Current assignee: GUANGZHOU XINYE HARDWARE FURNITURE Co.,Ltd.
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2020-03-24
Anticipated expiration: 2039-10-30
Also published as: CN110897379B

Abstract

The invention relates to the field of bookshelves, in particular to a production process of a multifunctional bookshelf, which comprises a support mechanism, a movable mechanism, a main body mechanism, a transmission mechanism and a platform mechanism, wherein the support mechanism is arranged on the support mechanism; when a user takes down books and needs to read, the user can manually hold the handle and rotate, the handle rotates to drive the connecting shaft to rotate, the connecting shaft rotates to drive the gear to rotate, when the gear rotates anticlockwise, the gear applies force to the first toothed plate and the second toothed plate, the first toothed plate and the second toothed plate are driven to generate a trend of moving backwards, then the first toothed plate and the second toothed plate respectively settle platform application of force to the first settling platform and the second settling platform, the first bookshelf and the second bookshelf receive thrust, the bases and the direction wheels mounted on the first bookshelf and the second bookshelf are stressed equally, then the two bases slide backwards in the sliding groove, the direction wheels roll backwards on the bottom plate, finally the first settling platform and the second settling platform are opened, a reading platform is obtained, and the book reading platform can be used by the user conveniently.

Description

Production process of multifunctional bookshelf

Technical Field

The invention relates to the field of bookshelves, in particular to a production process of a multifunctional bookshelf.

Background

A bookshelf is a special appliance for placing books. Due to different shapes and structures of the bookshelves, the bookcases, bookshelves, book partitions and other names exist. The bookshelf is a common tool in our life. The bookshelf can be divided into a metal bookshelf and a wood bookshelf according to the material, and the metal bookshelf can be divided into a single-column type, a multi-column type, a laminated bookshelf, a dense library and a sliding bookshelf. With the higher and higher requirements of people on reading level, the functional characteristics of the bookshelf are more and more abundant.

However, in the actual use process of the traditional bookshelf, the structure is often simpler, and the functions are more single. Because the area of a general indoor study room is small, when people need to read at home, the bookshelf can only be used for placing books usually, and needs to read on a desk arranged additionally, so that the bookshelf occupies less space of the study room, and wastes the space; meanwhile, in the using process, due to the fact that some books are stacked innermost when the existing bookshelf is used for stacking the books, the existing bookshelf is inconvenient to take out when the books need to be read.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a production process of a multifunctional bookshelf.

The technical scheme adopted by the invention for solving the technical problems is as follows: a production process of a multifunctional bookshelf comprises the following steps:

s1, firstly, manually assembling the bookshelf, and after the bookshelf is assembled, reasonably arranging the bookshelf in a proper place in a study room of a home to finish the fixed installation of the bookshelf;

s2, in the using process of the user, the user can manually stir the structure of the book on the bookshelf to make the structure generate the rotating effect, so that the user can conveniently take the needed proper book at any time, and meanwhile, when the user needs to read for a long time, the bookshelf can be unfolded to form a reading platform by adjusting the corresponding operating mechanism, so that the user can conveniently use the reading platform;

s3: after the user finishes reading, the user can recover the reading platform to the original position again by continuously operating the operating mechanism so as to avoid occupying the study room space;

wherein the reducing mould plumbing installation of the drawing of patterns of being convenient for of pouring in S1, S2 and S3 includes support mechanism, moving mechanism, main body mechanism, drive mechanism and platform mechanism for settle other mechanisms the top of support mechanism is equipped with and is used for removing the device moving mechanism, moving mechanism' S top is equipped with and is used for playing the effect of settling books main body mechanism, be equipped with between the main body mechanism and be used for playing and provide reading platform mechanism, it is used for conveniently to be equipped with between the platform mechanism uses drive mechanism.

Specifically, the support mechanism comprises a bottom plate and a sliding groove, wherein the sliding groove with a T-shaped cross section is arranged on one side of the top of the rectangular plate-shaped bottom plate.

Specifically, the movable mechanism comprises a base, a sliding block and a direction wheel, the sliding block with a T-shaped radial section is respectively clamped at two ends of the sliding groove part arranged on the top of the bottom plate, the base with an inverted U-shaped shape is fixed on the top of the sliding block, and the direction wheel assisting the base to move is arranged at the other end of the base.

The main mechanism comprises a first bookshelf, a second bookshelf, a first placing groove, a second placing groove, a rotating shaft and a fixed seat, wherein the tops of the two bases are respectively fixed with the first bookshelf and the second bookshelf which are rectangular cubes, the first bookshelf and the second bookshelf which are rectangular cubes are uniformly arranged on the opposite sides of the first bookshelf and the second bookshelf, and the two adjacent sides of the first bookshelf and the second bookshelf which are provided with the first placing groove are uniformly provided with the four second placing grooves which are rectangular cubes; the middle parts of the first bookshelf and the second bookshelf are provided with the fixing seats in a rectangular plate shape, the insides of the first bookshelf and the second bookshelf are respectively and rotatably connected with the rotating shafts in a rod shape, and the two rotating shafts respectively penetrate through the first bookshelf and the second bookshelf and are fixed on the top of the base.

Specifically, the platform mechanism comprises a first placing table and a second placing table, one rectangular plate-shaped first placing table and one rectangular plate-shaped second placing table are respectively fixed on opposite sides of the two fixing seats, and the first placing table is located at the top of the second placing table.

Specifically, the transmission mechanism comprises a connecting rod, a first toothed plate, a second toothed plate, a placing cylinder, a gear, a connecting shaft, a handle, a sheath and a through groove, the connecting rod is fixed on one side, away from the first bookshelf, of the fixing seat on the first bookshelf, the cylindrical placing cylinder is fixed at the other end of the connecting rod, the through grooves are respectively formed in the top and the bottom of the placing cylinder, the gear is arranged in the placing cylinder at the position where the through grooves are formed, the connecting shaft is fixed in the middle of the gear, one end of the connecting shaft penetrates through the placing cylinder and is fixed with the handle in a Z-shaped shape, and the sleeve-shaped sheath is fixed on the side wall of one end, away from the placing cylinder, of the handle; the top and the bottom of the gear are respectively meshed with the first toothed plate and the second toothed plate, the top of the first toothed plate is fixed to one side of the bottom of the first placing table, and the bottom of the second toothed plate is fixed to the top of one side of the second placing table.

The invention has the beneficial effects that:

(1) the invention relates to a production process of a multifunctional bookshelf, when a user reads, the user manually places some books with larger occupied area on a first placing groove arranged on a first bookshelf and a second bookshelf and places some unusual small books on a second placing groove arranged on the first bookshelf and the second bookshelf, in the actual use process, the user manually takes out the corresponding needed books from the first placing groove or the second placing groove, when the books needed to be taken are not in the first placing groove and the second placing groove in front of the user, the user can manually stir the first bookshelf or the second bookshelf, the first bookshelf and the second bookshelf start to rotate around a rotating shaft under the action of moment, the first bookshelf and the second bookshelf rotate to drive the first placing groove and the second placing groove to rotate, and therefore the user can conveniently rotate the first placing groove or the second placing groove for placing the needed books to the front of the user, the book taking device has the advantages that a user can conveniently take out corresponding required books when using the book taking device, the operation is simple, and the use is convenient and fast.

(2) The invention relates to a production process of a multifunctional bookshelf, when a user needs to read books for a long time after taking down the books, the user can manually hold the part of a sheath on a handle and rotate the sheath, so as to facilitate the manual operation of the user, when the handle rotates, a connecting shaft rotates, the connecting shaft rotates to drive a gear to rotate, when the gear rotates anticlockwise, the gear applies force to a first toothed plate and a second toothed plate, namely the first toothed plate and the second toothed plate are driven to generate a trend of moving backwards, the first toothed plate and the second toothed plate respectively apply force to a first mounting table and a second mounting table, the first mounting table and the second mounting table respectively apply force to a fixed seat on the first bookshelf and a fixed seat on the second bookshelf after applying force, the two fixed seats respectively generate bookshelf driving force to the first bookshelf and the second bookshelf after applying force, and after applying force to the first bookshelf and the second bookshelf, the base and a direction wheel which are installed on the first bookshelf and the second bookshelf are also applied force, the two bases slide back to back in the sliding groove, and the direction wheels roll back to back on the bottom plate, so that the first placing table and the second placing table are finally opened to obtain a reading platform, and the reading platform is convenient for a user to use.

(3) According to the production process of the multifunctional bookshelf, after a user finishes reading, the rotating handle which is opposite to the previous rotating direction drives the connecting shaft to rotate, the connecting shaft rotates to drive the gear to rotate, the gear applies force to the first toothed plate and the second toothed plate, the first toothed plate and the second toothed plate respectively apply force to the first placing table and the second placing table, and finally the first placing table and the second placing table are retracted to the original positions again, so that the first placing table and the second placing table are conveniently folded and overlapped in a non-use state, occupation of a study space is reduced, and rationality of study space utilization is improved.

Drawings

FIG. 1 is a flow chart of the present invention;

FIG. 2 is a schematic view of an overall structure of a preferred embodiment of the multifunctional bookshelf according to the invention;

FIG. 3 is a schematic structural diagram of the main body mechanism shown in FIG. 2;

FIG. 4 is a schematic view of the connection structure between the transmission mechanism and the platform mechanism shown in FIG. 2;

FIG. 5 is a schematic view of the connection mechanism of the support mechanism and the movable mechanism shown in FIG. 2;

fig. 6 is an enlarged view of the portion a shown in fig. 2.

In the figure: 1. the device comprises a support mechanism, 11, a bottom plate, 12, a sliding groove, 2, a movable mechanism, 21, a base, 22, a sliding block, 23, a direction wheel, 3, a main body mechanism, 31, a first bookshelf, 32, a second bookshelf, 33, a first placing groove, 34, a second placing groove, 35, a rotating shaft, 36, a fixed seat, 4, a transmission mechanism, 41, a connecting rod, 42, a first toothed plate, 43, a second toothed plate, 44, a placing cylinder, 45, a gear, 46, a connecting shaft, 47, a handle, 48, a sheath, 49, a through groove, 5, a platform mechanism, 51, a first placing table, 52 and a second placing table.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in figures 1-6, the production process of the multifunctional bookshelf comprises the following steps:

the multifunctional bookshelf in the S1, the S2 and the S3 comprises a support mechanism 1, a movable mechanism 2, a main body mechanism 3, a transmission mechanism 4 and a platform mechanism 5, wherein the movable mechanism 2 is used for arranging other mechanisms, the movable mechanism 2 is used for moving a device and is arranged at the top of the support mechanism 1, the main body mechanism 3 is used for arranging books, the platform mechanism 5 is used for providing a reading platform and is arranged between the main body mechanisms 3, and the transmission mechanism 4 is arranged between the platform mechanisms 5 and is used for facilitating the use of the platform mechanism 5.

Specifically, the support mechanism 1 comprises a bottom plate 11 and a sliding groove 12, wherein the sliding groove 12 with a T-shaped cross section is arranged on one side of the top of the rectangular plate-shaped bottom plate 1; the sliding groove 12 is arranged at the top of the bottom plate 11, so that the device is convenient to support and place other mechanisms; namely: firstly, the bottom plate 11 is reasonably arranged at a required proper place, so that the installation and the fixation of the whole device are facilitated.

Specifically, the movable mechanism 2 comprises a base 21, a sliding block 22 and a direction wheel 23, two ends of the top of the bottom plate 11, which are provided with the sliding groove 12, are respectively clamped with the sliding block 22 with a T-shaped radial section, the top of the sliding block 22 is fixed with the base 21 in an inverted u shape, and the other end of the base 21 is provided with the direction wheel 23 for assisting the movement of the base 21; when the sliding mechanism is used, the sliding block 22 at the bottom of the base 21 slides on the sliding groove 12, and the direction wheel 23 slides on the top surface of the bottom plate 11, so that the movable mechanism 2 drives the main mechanism 3 to slide back and forth, and the effect of moving the main mechanism 3 when the sliding mechanism is used is achieved.

Specifically, the main body mechanism 3 includes a first bookshelf 31, a second bookshelf 32, a first accommodating groove 33, a second accommodating groove 34, a rotating shaft 35 and a fixing seat 36, the tops of the two bases 21 are respectively fixed with the first bookshelf 31 and the second bookshelf 32 which are rectangular cubic, four first accommodating grooves 33 which are rectangular cubic are uniformly arranged on the opposite sides of the first bookshelf 31 and the second bookshelf 32, and four second accommodating grooves 34 which are rectangular cubic are uniformly arranged on the adjacent two sides of the first bookshelf 31 and the second bookshelf 32 which are provided with the first accommodating grooves 33; the middle parts of the first bookshelf 31 and the second bookshelf 32 are provided with the fixing seats 36 in a rectangular plate shape, the insides of the first bookshelf 31 and the second bookshelf 32 are respectively connected with the rotating shafts 35 in a rod shape in a rotating manner, and the two rotating shafts 35 respectively penetrate through the first bookshelf 31 and the second bookshelf 32 and are fixed on the top of the base 21; when the book taking device is used, a user manually places some books with large floor area on the first placing groove 33 arranged on the first bookshelf 31 and the second bookshelf 32, places some unusual small books on the second placing groove 34 arranged on the first bookshelf 31 and the second bookshelf 32, and in the actual use process, the user manually takes out corresponding required books from the first placing groove 33 or the second placing groove 34, and when the books required to be taken are not in the first placing groove 33 and the second placing groove 34 in front of the user, the user can manually shift the first bookshelf 31 or the second bookshelf 32, so that the first bookshelf 31 and the second bookshelf 32 start to rotate around the rotating shaft 35 under the action of moment, and the first bookshelf 31 and the second bookshelf 32 rotate to drive the first placing groove 33 and the second placing groove 34 to rotate, therefore, a user can conveniently rotate the first placing groove 33 or the second placing groove 34 for placing a needed book to the front, so that the user can conveniently take out the corresponding needed book when using the book taking device, and the book taking device is simple in operation and convenient and quick to use.

Specifically, the platform mechanism 5 includes a first mounting table 51 and a second mounting table 52, one rectangular plate-shaped first mounting table 51 and one rectangular plate-shaped second mounting table 52 are fixed to opposite sides of the two fixing bases 36, and the first mounting table 51 is located at the top of the second mounting table 52; when the reading platform is used, the first mounting table 51 and the second mounting table 52 are mounted on the opposite sides of the two fixing seats 36, so that the transmission mechanism 4 can be matched, a reading platform consisting of the first mounting table 51 and the second mounting table 52 can be conveniently and quickly obtained by a user when the reading platform is used, the reading process is more convenient for the user, and the reading experience of the user is improved.

Specifically, the transmission mechanism 4 includes a connecting rod 41, a first toothed plate 42, a second toothed plate 43, a placement barrel 44, a gear 45, a connecting shaft 46, a handle 47, a sheath 48 and a through groove 49, the connecting rod 41 is fixed to one side of the fixing seat 36 on the first book shelf 31, which is away from the first book shelf 31, the cylindrical placement barrel 44 is fixed to the other end of the connecting rod 41, the through groove 49 is respectively arranged at the top and the bottom of the placement barrel 44, the gear 45 is arranged in the placement barrel 44 at the position where the through groove 49 is arranged, the connecting shaft 46 is fixed to the middle of the gear 45, one end of the connecting shaft 46 penetrates through the placement barrel 44 and is fixed with the Z-shaped handle 47, and the sleeve-shaped sheath 48 is fixed to the side wall of one end of the handle 47, which is away from the placement barrel 44; the top and the bottom of the gear 45 are respectively engaged with the first toothed plate 42 and the second toothed plate 43, the top of the first toothed plate 42 is fixed to one side of the bottom of the first mounting table 51, and the bottom of the second toothed plate 43 is fixed to the top of one side of the second mounting table 52; when the book shelf is used, when a user takes down a book and needs to read the book for a long time, the user can manually hold the sheath 48 on the handle 47 and rotate the sheath, so as to facilitate the manual operation of the user, when the handle 47 rotates to drive the connecting shaft 46 to rotate, the connecting shaft 46 rotates to drive the gear 45 to rotate, when the gear 45 rotates counterclockwise, the gear 45 applies force to the first tooth plate 42 and the second tooth plate 43, namely, the first tooth plate 42 and the second tooth plate 43 are driven to generate a trend of moving backwards, then the first tooth plate 42 and the second tooth plate 43 respectively apply force to the first mounting table 51 and the second mounting table 52, and the first mounting table 51 and the second mounting table 52 respectively apply force to the fixing seat 36 on the first book shelf 31 and the fixing seat 36 on the second book shelf 32 after being stressed, after the two fixed seats 36 are stressed, pushing forces are respectively generated on the first bookshelf 31 and the second bookshelf 32, after the first bookshelf 31 and the second bookshelf 32 are stressed, the base 21 and the direction wheel 23 mounted on the first bookshelf 31 and the second bookshelf 32 are also stressed, so that the two bases 21 slide back to back in the sliding groove 12, and the direction wheel 23 rolls back on the bottom plate 11, so that the first placing table 51 and the second placing table 52 are finally opened, and a reading platform is obtained, which is convenient for a user to use; after the user finishes reading, the handle 47 is rotated in the opposite direction, and like the above, the first placing table 51 and the second placing table 52 are retracted to the original position again, so that the first placing table 51 and the second placing table 52 are folded and overlapped conveniently in a non-use state, the occupation of the study room space is reduced, and the rationality of the study room space utilization is improved.

When in use, firstly, the bottom plate 11 is reasonably arranged at a required proper place, so that the whole device is convenient to install and fix; when a user needs to read, a certain number of books with large floor area can be manually placed on the first placing grooves 33 arranged on the first book rack 31 and the second book rack 32, a certain number of uncommon small books are placed on the second placing grooves 34 arranged on the first book rack 31 and the second book rack 32, in the actual use process, the user manually takes out the corresponding needed books from the first placing grooves 33 or the second placing grooves 34, when the books needed to be taken are not in the first placing grooves 33 and the second placing grooves 34 in front of the user, the user can manually shift the first book rack 31 or the second book rack 32, the first book rack 31 and the second book rack 32 start to rotate around the rotating shaft 35 under the action of torque, the first placing grooves 33 and the second placing grooves 34 are driven to rotate by the rotation of the first book rack 31 and the second book rack 32, and therefore the user can conveniently rotate the first placing grooves 33 or the second placing grooves 34 in front of the needed books, the user can conveniently take out the corresponding needed books when using the book taking device, and the book taking device is simple to operate and convenient and quick to use; when a user needs to read a book for a long time after taking off the book, the user can manually hold the sheath 48 on the handle 47 and rotate the sheath, so as to facilitate the manual operation of the user, when the handle 47 rotates to drive the connecting shaft 46 to rotate, the connecting shaft 46 rotates to drive the gear 45 to rotate, when the gear 45 rotates counterclockwise, the gear 45 applies force to the first toothed plate 42 and the second toothed plate 43, i.e. the first toothed plate 42 and the second toothed plate 43 are driven to move back, the first toothed plate 42 and the second toothed plate 43 respectively apply force to the first mounting table 51 and the second mounting table 52, after the force is applied to the first mounting table 51 and the second mounting table 52, the force is applied to the fixed seat 36 on the first bookshelf 31 and the fixed seat 36 on the second bookshelf 32, after the two fixed seats 36 are applied, the first bookshelf 31 and the second bookshelf 32 respectively generate driving force, after the first bookshelf 31 and the second bookshelf 32 are applied with the driving force, and the base 21 and the direction wheel 23 mounted on the first bookshelf 31 and the second bookshelf 32 are also applied with the driving force, the two bases 21 slide back to back in the sliding chute 12, and the direction wheel 23 rolls back on the bottom plate 11, so that the first placing table 51 and the second placing table 52 are finally opened, and a reading platform is obtained, which is convenient for a user to use; after the user finishes reading, the handle 47 is rotated in the opposite direction, and as above, the first placing table 51 and the second placing table 52 are retracted to the original positions again, so that the first placing table 51 and the second placing table 52 are folded and overlapped conveniently in a non-use state, occupation of the study room space is reduced, rationality of study room space utilization is improved, and the whole using process of the device is finished finally.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the embodiments and descriptions given above are only illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The production process of the multifunctional bookshelf is characterized by comprising the following steps:

wherein the reducing mould pipeline device of the convenient to pouring drawing of patterns in S1, S2 and S3 includes support mechanism (1), moving mechanism (2), main body mechanism (3), drive mechanism (4) and platform mechanism (5), is used for settling other mechanisms the top of support mechanism (1) is equipped with and is used for removing to the device moving mechanism (2), the top of moving mechanism (2) is equipped with and is used for playing and settles books effect main body mechanism (3), be equipped with between main body mechanism (3) and be used for playing and provide reading platform mechanism (5), be equipped with between platform mechanism (5) and be used for the convenience platform mechanism (5) use drive mechanism (4).

2. The production process of the multifunctional bookshelf according to claim 1, wherein the production process comprises the following steps: the support mechanism (1) comprises a bottom plate (11) and a sliding groove (12), wherein the sliding groove (12) with a T-shaped section is arranged on one side of the top of the rectangular plate-shaped bottom plate (11).

3. The production process of the multifunctional bookshelf according to claim 2, wherein the production process comprises the following steps: the movable mechanism (2) comprises a base (21), a sliding block (22) and a direction wheel (23), wherein the sliding block (22) with a T-shaped radial section is respectively clamped at two ends of the position of the sliding groove (12) arranged at the top of the bottom plate (11), the base (21) with an inverted U-shaped shape is fixed at the top of the sliding block (22), and the direction wheel (23) for assisting the base (21) to move is arranged at the other end of the base (21).

4. The production process of the multifunctional bookshelf according to claim 3, wherein the production process comprises the following steps: the main body mechanism (3) comprises a first bookshelf (31), a second bookshelf (32), a first placing groove (33), a second placing groove (34), a rotating shaft (35) and a fixed seat (36), the tops of the two bases (21) are respectively fixed with the first bookshelf (31) and the second bookshelf (32) which are rectangular cubes, the first placing groove (33) which are rectangular cubes are uniformly arranged on the opposite sides of the first bookshelf (31) and the second bookshelf (32), and the two adjacent sides of the first bookshelf (31) and the second bookshelf (32) which are provided with the first placing groove (33) are uniformly provided with the four second placing grooves (34) which are rectangular cubes; the middle parts of the first bookshelf (31) and the second bookshelf (32) are provided with the fixing seats (36) in a rectangular plate shape, the interiors of the first bookshelf (31) and the second bookshelf (32) are respectively and rotatably connected with the rotating shafts (35) in a rod shape, and the two rotating shafts (35) respectively penetrate through the first bookshelf (31) and the second bookshelf (32) and are fixed on the top of the base (21).

5. The production process of the multifunctional bookshelf according to claim 4, wherein the production process comprises the following steps: the platform mechanism (5) comprises a first mounting table (51) and a second mounting table (52), one rectangular plate-shaped first mounting table (51) and one rectangular plate-shaped second mounting table (52) are respectively fixed on the opposite sides of the two fixed seats (36), and the first mounting table (51) is positioned at the top of the second mounting table (52).

6. The production process of the multifunctional bookshelf according to claim 5, wherein the production process comprises the following steps: the transmission mechanism (4) comprises a connecting rod (41), a first toothed plate (42), a second toothed plate (43), a placing barrel (44), a gear (45), a connecting shaft (46), a handle (47), a sheath (48) and a through groove (49), one side, deviating from the first bookshelf (31), of the fixing seat (36) on the first bookshelf (31) is fixed with the connecting rod (41), the other end of the connecting rod (41) is fixed with the placing barrel (44) which is cylindrical, the top and the bottom of the placing barrel (44) are respectively provided with one through groove (49), the gear (45) is arranged in the position, provided with the through groove (49), of the inside of the placing barrel (44), the connecting shaft (46) is fixed in the middle of the gear (45), one end of the connecting shaft (46) penetrates through the placing barrel (44) and is fixed with the handle (47) which is Z-shaped, a sleeve-shaped sheath (48) is fixed on the side wall of one end of the handle (47) which is far away from the mounting cylinder (44); the top and the bottom of the gear (45) are respectively meshed with the first toothed plate (42) and the second toothed plate (43), the top of the first toothed plate (42) is fixed to one side of the bottom of the first mounting table (51), and the bottom of the second toothed plate (43) is fixed to the top of one side of the second mounting table (52).