CN210471401U

CN210471401U - A workstation for engineering cost

Info

Publication number: CN210471401U
Application number: CN201921149503.XU
Authority: CN
Inventors: 唐婷
Original assignee: Huaxin Project Management Group Co Ltd
Current assignee: Huaxin Project Management Group Co Ltd
Priority date: 2019-07-19
Filing date: 2019-07-19
Publication date: 2020-05-08
Anticipated expiration: 2029-07-19

Abstract

The utility model relates to office equipment for construction cost, and discloses a workbench for construction cost, which comprises a table plate, a support column arranged at the bottom of the table plate and a base arranged at the bottom of the support column, wherein the upper surface of the table plate is provided with a placement groove for accommodating a display, the opening of the placement groove is provided with a cover plate, a first sliding groove is arranged on two side walls of the placing groove, a sliding block is arranged in the first sliding groove in a sliding manner, a rotating shaft is rotatably connected between the two sliding blocks, a display is fixed on the rotating shaft, a fixed shaft is rotatably connected to the bottom of one side of the placing groove, which is far away from the rotating shaft, a motor is fixed on the fixed shaft, a reciprocating screw rod is coaxially connected to an output shaft of the motor, and a sleeve column is matched with the reciprocating screw rod in a threaded manner, one end, far away from the motor, of the sleeve column is rotatably connected with the back of the display, and a limiting assembly which is used for fixing the sliding block and can be opened and closed is arranged in the side wall of one end, close to the motor, of the sliding groove I. The effects of fully utilizing space and having stable and reliable structure are achieved.

Description

A workstation for engineering cost

Technical Field

The utility model relates to an office equipment for engineering cost, in particular to a workstation for engineering cost.

Background

The project cost is the sum of all costs expected or actually required to complete the construction of a project. In the process of cost budgeting, the engineering product needs to be observed and data is recorded, and then the price is calculated according to the data. In engineering cost course of work, need use the workstation that is used for engineering cost, usable computer processing data or see picture paper, do the note, browse the data etc. on the workstation, the display of computer is placed on the workstation, and when need not use the computer, the display has still occupied great workstation desktop space, influences tiling drawing or carry out other office work on the workstation.

Chinese patent with publication number CN208821877U and application date of 2018, 3 and 20 discloses a workbench for engineering cost, and the technical scheme is as follows: the device comprises a stand column, a bedplate and an accommodating frame, wherein the stand column is vertically and fixedly connected to the upper surface of a base; the accommodating frame comprises a pair of guide plates which are vertically and fixedly connected with the lower surface of the bedplate; the vertical sliding connection has the lifter plate between two limiting plate platens, has seted up the opening that can supply the vertical grafting of lifter plate on, and the length of opening is greater than the length of display. The utility model discloses a when not using the display, the display can pass through the opening downstream to the below of platen, but the vertical displacement of display to platen bottom have occupied the space at the bottom of the table, and on the one hand is played to the foot easily, and the easy deposition of open holding frame of on the other hand and placing of display are also unstable, consequently should provide a new technical scheme and solve above-mentioned problem.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a workstation for engineering cost, its standing groove through set up the display in that the table is inside does not occupy the foot space, has reached the reliable effect of make full use of space, stable in structure.

The above technical purpose of the present invention can be achieved by the following technical solutions:

a workbench for engineering cost comprises a desk plate, a support column arranged at the bottom of the desk plate and a base arranged at the bottom of the support column, a placing groove for accommodating the display is arranged on the upper surface of the desk plate, a cover plate is arranged at the opening of the placing groove, a first sliding groove is horizontally arranged on the two side walls of the short edge of the placing groove, a sliding block is arranged in the first sliding groove in a sliding manner, a rotating shaft is rotatably connected between the two sliding blocks, a display is fixed on the rotating shaft, a fixed shaft is rotatably connected with the bottom of one side of the placing groove far away from the rotating shaft, a motor is fixed on the fixed shaft, an output shaft of the motor is coaxially connected with a reciprocating screw rod, and a sleeve column is matched with the reciprocating screw rod through threads, one end of the sleeve column far away from the motor is rotationally connected with the back of the display, and a limiting component for limiting the sliding block is arranged in the side wall of one end, close to the motor, of the first sliding groove.

By adopting the structure, the motor is externally connected with a power supply through a circuit, when a display needs to be collected, the sliding block is separated from the limiting assembly by opening the limiting assembly, so that the sliding block can slide in the first sliding groove, the rotating shaft is dragged to one end, away from the motor, of the sliding groove, the motor is started again, and as the sleeve column is in threaded fit with the reciprocating screw rod, the sleeve column can stretch along the reciprocating screw rod in the process that the motor drives the reciprocating screw rod to rotate, so that the lifting effect of one end, away from the rotating shaft, of the display is realized, when the display descends to the placing groove which is completely collected, the motor is turned off, and the opening of the placing groove is closed through the cover plate, so that the; when needing to launch the display once more, open the apron, promote the pivot toward motor one side, and the starter motor, when the pivot promotes to the spout one when being close to the one end of motor, the slider is fixed in the spout one through spacing subassembly, and when reciprocal lead screw and cover post stretch out and draw back to when making the display vertical, close the motor, can launch the display, through the standing groove that sets up the display in table inside, do not occupy the foot space, and through the closed standing groove of apron, also can avoid the deposition, the make full use of space has been reached, the reliable and stable in structure's effect.

More preferably: the limiting component comprises a first inserting groove horizontally arranged on the side wall of the sliding block abutted against the first sliding groove, a first limiting groove horizontally arranged on the side wall of the first sliding groove and corresponding to one position of the first inserting groove, a limiting block arranged in the first limiting groove in a sliding process and inserted in the first inserting groove, a first compression spring with one end connected with the side wall of the limiting block far away from the first sliding groove and the other end connected with the side wall of the first limiting groove, an abutting block arranged on the top wall of the limiting block and close to one side of the placing groove and provided with an inclined surface, a sliding groove arranged on the top wall of the first limiting groove and used for sliding of the abutting block, and a pressing column vertically inserted in the table plate and driven by the inclined surface of the abutting block in the process of up-and-down displacement, wherein in an initial state, one end of the limiting block extends, the sliding groove supplies the butt block to slide along the displacement direction of the limiting block, and the space is not less than the length of the limiting block extending out of the limiting groove I in the initial state.

Adopt above-mentioned structure, press the pressing post, because the inclined plane butt of the inclined plane of pressing the toe portion and butt piece, press the in-process that the post moved down, can promote the butt piece in the sliding groove toward the direction displacement of keeping away from spout one, thereby it withdraws to spacing inslot to drive the one end that the stopper is located spout one, slide the slider this moment to the position department of spacing inslot one, loosen the pressing post, because the answer action of compression spring one, support the one end of stopper out the spout and peg graft in inserting groove one in the lump, thereby realize the fixed to the slider at spout one internal position, when needing the slider displacement, press the pressing post once more, make the stopper one break away from inserting groove one can, spacing subassembly's setting, can control the fixed and the slip of slider in spout one.

More preferably: the output shaft of the motor is provided with an insertion block, the reciprocating screw rod is provided with an insertion hole for the insertion of the insertion block, and a fixing assembly for limiting the insertion block is arranged in the side wall of the insertion hole.

Adopt above-mentioned structure, through the cooperation of grafting piece and inserting groove and fixed subassembly, when the motor damages and needs to be changed the motor, remove the back with other fixed measures of motor, make fixed subassembly break away from the fixed to the grafting piece, directly with the output shaft of motor from reciprocal lead screw in extract can, peg graft new motor to inserting groove in and fixed can accomplish the change to the motor again, the setting of above-mentioned structure makes the change of motor more simple and convenient.

More preferably: the fixing assembly comprises a second insertion groove arranged on the side wall of the insertion block along the direction vertical to the axis of the output shaft, a second limit groove arranged on the side wall of the insertion hole and corresponding to the second insertion groove, a fixed block arranged in the second limit groove in a sliding mode and inserted in the second insertion groove in the sliding process, a pull rod with one end connected with the side wall of the fixed block far away from the insertion hole and the other end extending out of the side wall of the reciprocating screw rod, and a second compression spring arranged on the pull rod in a penetrating mode and abutted against the side walls of the fixed block and the second limit groove.

By adopting the structure, when the motor needs to be installed or replaced, the pull rod is pulled up, the fixing block is separated from the second insertion groove, the motor is pulled out, the insertion block of the output shaft of a new motor is inserted into the second insertion groove, the pull rod is loosened, and due to the restoring effect of the compression spring II, one end of the fixing block is pushed out of the second limiting groove and inserted into the second insertion groove, so that the fixing of the insertion block in the second insertion groove is realized, and the fixing and the loosening of the insertion block are simpler and more convenient due to the design of the structure.

More preferably: the desk plate is provided with a circle of limiting rings for the cover plate to be placed along the opening of the placing groove, and the upper surface of the cover plate is provided with a recessed pull groove.

Adopt above-mentioned structure, through the cooperation of spacing collar and apron, make the apron place steadily on the opening of standing groove, and can make the upper surface of table keep flushing, make the surface of table more clean and tidy.

More preferably: the vertical side wall of the table plate is horizontally provided with a holding groove for the cover plate to be inserted.

Adopt above-mentioned structure, through the setting of holding tank, when launching the display and need opening the apron, the holding tank can be accomodate into to the apron, and when the display that does not use, takes out the apron and the lid closes the opening to the standing groove, and the setting of holding tank can be conveniently to depositing and taking of apron.

More preferably: the sliding groove is horizontally formed in the two adjacent vertical side walls of the containing groove along the side walls, sliding strips are arranged in the sliding grooves in a sliding mode, penetrating grooves penetrating through the bottom walls are formed in the bottom walls of the containing groove, and push rods penetrating through the penetrating grooves and with one ends extending out of the penetrating grooves are arranged at the bottoms of the sliding strips.

Adopt above-mentioned structure, when the apron was placed into the holding tank in, it is probably comparatively difficult to take out, through the setting of draw runner and push rod, will be located the push rod of table bottom and outwards push, and then drive the draw runner and release the apron from the holding tank to the apron is conveniently taken out from the holding tank.

More preferably: and a handle is fixed at the bottom end of the push rod.

By adopting the structure, the handle is arranged to accord with the working habit of the worker, so that the push rod is pushed more conveniently and quickly.

To sum up, the utility model discloses following beneficial effect has:

1. when the display needs to be collected, the sliding block is separated from the limiting assembly by opening the limiting assembly, so that the sliding block can slide in the first sliding groove, the rotating shaft is dragged to one end, away from the motor, of the sliding groove, the motor is started again, the sleeve column is in threaded fit with the reciprocating screw rod, and in the process that the motor drives the reciprocating screw rod to rotate, the sleeve column can stretch along the reciprocating screw rod, so that the lifting effect is achieved at one end, away from the rotating shaft, of the display, when the display descends to the place groove which is completely collected, the motor is closed, and the opening of the place groove is closed through the cover plate, so that the leveling of the table plate can be achieved; when the display needs to be started again, the cover plate is opened, the rotating shaft is pushed to one side of the motor, the motor is started, when the rotating shaft is pushed to one end, close to the motor, of the first sliding groove, the sliding block is fixed in the first sliding groove through the limiting assembly, when the reciprocating screw rod and the sleeve column stretch to enable the display to be vertical, the motor is closed, the display can be started, and the placing groove of the display is formed in the table plate, so that the foot space is not occupied, and the effects of fully utilizing the space and being stable and reliable in structure are achieved;

2. through the cooperation of grafting piece and inserting groove and fixed subassembly, when the motor damages and need change the motor, remove the back with other fixed measures of motor, make fixed subassembly break away from the fixed to the grafting piece, directly with the output shaft of motor from reciprocal lead screw in extract can, peg graft new motor to the inserting groove in and fixed can accomplish the change to the motor again, the setting of above-mentioned structure makes the change of motor more simple and convenient.

Drawings

FIG. 1 is a schematic view of the overall structure of the present embodiment;

FIG. 2 is a schematic structural diagram of the display when the display is enabled according to the present embodiment;

FIG. 3 is a cross-sectional view of the stop assembly of FIG. 1;

FIG. 4 is a cross-sectional view of the fixing assembly of FIG. 2;

figure 5 is a half-sectional view of the receiving tank of figure 1.

In the figure, 1, a table plate; 2. a support pillar; 3. a base; 4. a placement groove; 5. a limiting ring; 6. a cover plate; 7. a concave pull groove; 8. a first sliding chute; 9. a slider; 10. a rotating shaft; 11. a display; 12. a groove; 13. a fixed shaft; 14. a motor; 15. a reciprocating screw rod; 16. sleeving a column; 17. a bump; 18. an output shaft; 19. a limiting component; 191. a first inserting groove; 192. a first limiting groove; 193. a limiting block; 194. a first compression spring; 195. a butting block; 196. a sliding groove; 197. pressing the column; 20. an insertion block; 21. inserting holes; 22. a fixing assembly; 221. a second inserting groove; 222. a second limiting groove; 223. a fixed block; 224. a pull rod; 225. a second compression spring; 23. accommodating grooves; 24. a second chute; 25. a slide bar; 26. a push rod; 27. a handle; 28. and (6) penetrating through the groove.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The utility model provides a workstation for engineering cost, as shown in fig. 1, including table 1, be fixed in support column 2 and the base 3 that the level was fixed in support column 2 bottom of table 1 bottom, standing groove 4 has been seted up on the upper surface of table 1, standing groove 4 is rectangle and is used for accomodating display 11, table 1 has seted up round spacing collar 5 (refer to fig. 2) along the opening of standing groove 4, it has a apron 6 to peg graft in the spacing collar 5, and the sunken formula kerve 7 has been seted up to one side of the upper surface of apron 6.

As shown in fig. 2, a first sliding slot 8 is horizontally formed on two side walls of a short side of the placing slot 4, the first sliding slot 8 is arranged along the direction of the short side of the placing slot 4, sliding blocks 9 are respectively arranged in the first sliding slot 8 in a sliding manner, a horizontal rotating shaft 10 is rotatably connected between the two sliding blocks 9, the middle part of the rotating shaft 10 is fixedly connected with a bottom pillar of a display 11, a groove 12 is formed at the bottom of one side of the placing slot 4 away from the rotating shaft 10, the side surface of the groove 12 close to the rotating shaft 10 is arranged as an inclined surface, a fixed shaft 13 is rotatably connected in the groove 12, the fixed shaft 13 is arranged in parallel to the rotating shaft 10, a motor 14 is fixed on the middle part of the fixed shaft 13, the motor 14 is externally connected with a power supply through a circuit, a reciprocating screw rod 15 is coaxially connected on an output shaft 18 of the motor 14, a set of posts 16 are matched on the reciprocating screw, the end of the stem 16 remote from the motor 14 is rotatably connected to the shaft. Starting the motor 14, the motor 14 drives the reciprocating screw rod 15 to rotate, and the sleeve column 16 is in threaded fit with the reciprocating screw rod 15, so that the sleeve column 16 can move along the threaded rod in a telescopic mode, the display 11 can be lifted, when the display 11 is adjusted to a proper height, the rotating shaft 10 needs to be fixed, and therefore a limiting assembly 19 (refer to fig. 3) for limiting the sliding block 9 is further arranged in the side wall of one end, close to the motor 14, of the sliding groove I8.

As shown in fig. 3, the limiting component 19 includes a first insertion groove 191, a first limiting groove 192, a limiting block 193, a first compression spring 194, a first abutting block 195, a first sliding groove 196 and a pressing column 197, the first insertion groove 191 is horizontally arranged on the side wall where the sliding block 9 abuts against the first sliding groove 8, the first limiting groove 192 is horizontally arranged on the side wall of the first sliding groove 8, the first limiting groove 192 corresponds to the first insertion groove 191, the limiting block 193 is slidably arranged in the first limiting groove 192, the limiting block 193 is inserted in the first insertion groove 191 in the sliding process, one end of the first compression spring 194 is connected with the side wall of the first limiting block 193 far away from the first sliding groove 8, the other end of the first compression spring 194 is connected with the side wall of the first limiting groove 192, the abutting block 195 is arranged on the top wall of the limiting block 193, one side of the abutting block 195 close to the placing groove 4 is provided with an inclined surface, the sliding groove 196 is, the bottom of the pressing column 197 is set to be an inclined surface abutting against the inclined surface of the abutting block 195, and the top end of the pressing column 197 extends out of the wall of the table board 1. Under the initial state, the one end of stopper 193 stretches out to spout 8 in from the first spacing groove, and the space that the gliding direction of stopper 193 is followed to the confession butt piece 195 along stopper 193 confession of sliding groove 196 is not less than the length that the first spacing groove stretched out under stopper 193 initial state.

In order to facilitate the replacement of the motor 14, as shown in fig. 4, an insertion block 20 is fixed on an output shaft 18 of the motor 14 (refer to fig. 2), an insertion hole 21 for inserting the insertion block 20 is formed on the reciprocating screw rod 15, and a fixing component 22 for limiting the insertion block 20 is arranged in a side wall of the insertion hole 21.

The fixing component 22 comprises a second insertion groove 221, a second limit groove 222, a fixing block 223, a pull rod 224 and a second compression spring 225, wherein the second insertion groove 221 is formed in the side wall of the insertion block 20, the second insertion groove 221 is formed in the direction perpendicular to the axis of the output shaft 18, the second limit groove 222 is formed in the side wall of the insertion hole 21 and corresponds to the second insertion groove 221 in position, the fixing block 223 is arranged in the second limit groove 222 in a sliding mode, the fixing block 223 is inserted in the second insertion groove 221 in the sliding process, one end of the pull rod 224 is connected with the side wall, far away from the insertion hole 21, of the fixing block 223, the other end of the pull rod 224 extends out of the side wall of the reciprocating screw rod 15, the second compression spring 225 is arranged on the pull rod 224 in a penetrating mode, and two ends of the second compression spring 225 are respectively abutted.

When the display 11 is started, the cover plate 6 needs to be opened, and the problem of storage and taking of the cover plate 6 is solved, as shown in fig. 5, therefore, an accommodating groove 23 is horizontally formed in the vertical side wall of the front side of the table plate 1 (see fig. 1) for the cover plate 6 (see fig. 1) to be inserted, two adjacent vertical side walls of the accommodating groove 23 are provided with two sliding grooves 24, the two sliding grooves 24 are horizontally arranged along the side walls, sliding strips 25 are arranged in the two sliding grooves 24 in a sliding manner, and two ends of each sliding strip 25 are respectively inserted into the two sliding grooves 24; the bottom wall of the accommodating groove 23 is provided with a through groove 28 penetrating through the bottom wall, the bottom of the slide bar 25 is fixed with a push rod 26, the push rod 26 penetrates through the through groove 28, one end of the push rod 26 extends out of the through groove 28, and a handle 27 is fixed at one end of the push rod 26 extending out of the through groove 28.

The implementation principle of the embodiment is as follows: when the display 11 needs to be folded, the limiting block 193 is separated from the sliding block 9 by pressing the pressing column 197, so that the sliding block 9 can slide in the first sliding groove 8, the rotating shaft 10 is dragged to one end of the sliding groove, which is far away from the motor 14, the motor 14 is started again, because the sleeve column 16 is in threaded fit with the reciprocating screw rod 15, the sleeve column 16 can stretch along the reciprocating screw rod 15 in the process that the motor 14 drives the reciprocating screw rod 15 to rotate, so that the lifting effect of one end, which is far away from the rotating shaft 10, of the display 11 is realized, when the display 11 descends to be completely folded into the placing groove 4, the motor 14 is closed, and then the opening of the placing groove 4 is closed through the cover plate 6, so that the desk plate 1 can be leveled; when needing to start display 11 again, open apron 6, promote pivot 10 toward motor 14 one side, and start motor 14, when pivot 10 promotes to spout 8 when being close to the one end of motor 14, slider 9 is fixed in spout 8 through spacing subassembly 19, and when reciprocal lead screw 15 stretches out and draws back to make display 11 vertical with sleeve post 16, close motor 14, can fix the position of display 11, standing groove 4 through setting up display 11 in table 1 inside, do not occupy the foot space, the make full use of space has been reached, the reliable and stable effect of stable in structure.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent laws within the scope of the present invention.

Claims

1. The utility model provides a workstation for engineering cost, includes table (1), sets up in support column (2) of table (1) bottom and sets up in base (3) of support column (2) bottom, characterized by: the table is characterized in that a placing groove (4) used for containing a display (11) is formed in the upper surface of the table plate (1), a cover plate (6) is arranged at an opening of the placing groove (4), a first sliding groove (8) is horizontally formed in two side walls of a short side of the placing groove (4), a sliding block (9) is arranged in the first sliding groove (8) in a sliding mode, a rotating shaft (10) is rotatably connected between the two sliding blocks (9), the display (11) is fixed on the rotating shaft (10), a fixed shaft (13) is rotatably connected to the bottom of one side, far away from the rotating shaft (10), of the placing groove (4), a motor (14) is fixed on the fixed shaft (13), a reciprocating screw rod (15) is coaxially connected to an output shaft (18) of the motor (14), a sleeve column (16) is matched with a thread on the reciprocating screw rod (15), one end, far away from the motor (14), of the sleeve column (16) is rotatably connected with the back, and a limiting component (19) used for limiting the sliding block (9) is arranged in the side wall of one end, close to the motor (14), of the first sliding groove (8).

2. A workstation for construction costs according to claim 1, characterized by: the limiting component (19) comprises a first inserting groove (191) which is horizontally arranged on the side wall of the sliding block (9) abutted against the first sliding groove (8), a first limiting groove (192) which is horizontally arranged on the side wall of the first sliding groove (8) and corresponds to the first inserting groove (191), a limiting block (193) which is arranged in the first limiting groove (192) in a sliding mode and is inserted in the first inserting groove (191) in the sliding process, a first compression spring (194) which is connected with the side wall, far away from the first sliding groove (8), of the limiting block (193) at one end and is connected with the side wall of the first limiting groove (192) at the other end, a butting block (195) which is arranged on the top wall of the limiting block (193) and is provided with an inclined surface close to one side of the placing groove (4), a sliding groove (196) which is arranged on the top wall of the first limiting groove (192) and is used for the butting block (195) to slide, and a pressing column (197) which is inserted and vertically arranged in the table, in the initial state, one end of the limiting block (193) extends out of the first limiting groove (192) to the first sliding groove (8), and the sliding groove (196) is used for enabling the abutting block (195) to slide along the displacement direction of the limiting block (193) and is not smaller than the length of the limiting block (193) extending out of the first limiting groove (192) in the initial state.

3. A workstation for construction costs according to claim 1, characterized by: an inserting block (20) is arranged on an output shaft (18) of the motor (14), an inserting hole (21) for inserting the inserting block (20) is formed in the reciprocating screw rod (15), and a fixing assembly (22) for limiting the inserting block (20) is arranged in the side wall of the inserting hole (21).

4. A workstation for construction costs according to claim 3, characterized by: the fixing component (22) comprises a second insertion groove (221) which is formed in the side wall of the insertion block (20) in the direction perpendicular to the axis of the output shaft (18), a second limit groove (222) which is formed in the side wall of the insertion hole (21) and corresponds to the second insertion groove (221), a fixing block (223) which is arranged in the second limit groove (222) in a sliding mode and is inserted into the second insertion groove (221) in the sliding process, a pull rod (224) of which one end is connected with the side wall, far away from the insertion hole (21), of the fixing block (223) and the other end extends out of the side wall of the reciprocating screw rod (15), and a second compression spring (225) which is arranged on the pull rod (224) in a penetrating mode and is abutted to the side walls of the fixing block (223) and the second limit groove (.

5. A workstation for construction costs according to claim 1, characterized by: the table plate (1) is provided with a circle of limiting ring (5) for the cover plate (6) to be placed along an opening of the placing groove (4), and the upper surface of the cover plate (6) is provided with a recessed pull groove (7).

6. A workstation for construction costs according to claim 1, characterized by: and the vertical side wall of the table plate (1) is horizontally provided with a holding groove (23) for the insertion of the cover plate (6).

7. A workstation for construction costs according to claim 6, characterized by: two sliding grooves (24) are horizontally formed in two adjacent vertical side walls of the accommodating groove (23) along the side walls, sliding strips (25) are arranged in the two sliding grooves (24) in a sliding mode, penetrating grooves (28) penetrating through the bottom walls are formed in the bottom walls of the accommodating groove (23), and push rods (26) penetrating through the penetrating grooves (28) and extending out of one ends of the pushing rods to penetrate through the penetrating grooves (28) are arranged at the bottoms of the sliding strips (25).

8. A workstation for construction costs according to claim 7, characterized by: a handle (27) is fixed at the bottom end of the push rod (26).