Measuring instrument protection matching box

Abstract

The utility model discloses a measuring instrument protection matching box which comprises an upper cover and a lower cover, and a hinge structure, an anti-falling lock body structure and a sealing structure are arranged between the upper cover and the lower cover. Both the upper cover and the lower cover are provided with reinforcing structures and buffer protection structures; a strip-shaped groove is formed in the front end face of the lower cover, and an elastic strip-shaped plate is arranged in the strip-shaped groove. The anti-disengaging lock body structure comprises a first buckle hook set, a second buckle hook set, a first buckle block set and a first buckle ring set. According to the utility model, the anti-drop lock body structure is arranged to provide an anti-drop function, when the upper cover is initially closed, the buckle hook group I realizes initial fixed connection, when an operator completely covers the upper cover, the buckle hook group I and the buckle hook group II are stably buckled, and the buckle hook group I and the buckle hook group II are arranged to play an anti-drop role, so that the anti-drop function is realized. The situation that the upper cover and the lower cover are opened due to the fact that an operator does not completely lock the upper cover and the lower cover is avoided, an internal measuring instrument is prevented from falling off, and the measuring instrument is better protected.

Description

Technical Field

[0001] The utility model relates to the technical field of surveying and measuring instruments, and particularly relates to a protective matching box for measuring instruments. Background Art

[0002] When a project starts, engineering survey is carried out first. Engineering surveyors must select points and embed stones for control points in engineering survey, carry out construction lofting in engineering construction, construction survey of industrial and civil buildings, linear engineering survey, bridge engineering survey, underground engineering construction survey, water conservancy engineering survey, geological survey, seismic survey, mine underground survey, railway (high-speed railway) survey, building deformation survey and other special surveys, including observation and record keeping, as well as the surveying and mapping of engineering topographic maps; inspect the survey results data and provide survey data and survey drawings, etc. Total stations are mostly used in general engineering surveys. For the convenience of carrying the total station, a special storage box is required. Moreover, the existing storage boxes only simply store survey tools. Since the total station is usually used at the construction site, it is often subject to various collisions and falls when placed in the storage box. However, the traditional storage box cannot effectively reduce the damage suffered by the internal total station when the storage box falls. In addition, due to the heavy weight of the total station and the even heavier weight of the storage box, when it comes to places where vehicles cannot pass, it is necessary to carry the storage box manually or on the back to conduct surveys, which extremely affects work efficiency.

[0003] In view of the above problems, people invented the patent number: 202021900542.1, which discloses a storage device for engineering surveying tools with good protection effect, including a lower box body and an upper box body. The top of the lower box body is rotatably connected to the upper box body through a hinge. Shock-absorbing storage mechanisms for reducing the damage caused by the fall of the instrument during storage are symmetrically fixed on the inner walls of the upper box body and the lower box body. A lifting mechanism for facilitating the user to carry the storage device is fixed at the bottom of the lower box body. The shock-absorbing storage mechanism includes a sliding column, a blocking block, a support body, a sliding groove, a spring and a storage groove. The sliding columns are symmetrically fixed on the inner wall of the lower box body. The end of the sliding column far away from the lower box body is fixed with a blocking block. A support body is slidably connected to the inner wall of the lower box body. Sliding grooves are symmetrically opened at the four corners of the support body. The sliding grooves are slidably connected to the sliding columns. Springs are symmetrically fixed at the bottom of the support body. The utility model can effectively reduce the damage caused to the total station when the storage device falls normally, and at the same time can facilitate people to move the storage device.

[0004] However, the storage device still has the following problems: 1. One side of the upper box body and the lower box body of the storage device is rotationally connected by a hinge, and the other side is connected by a buckle lock to achieve the fixed connection between the upper box body and the lower box body. However, there is no anti-disengagement structure. When the operator performs the primary lid closing, since the buckle lock is required for locking, when the operator forgets to lock it and holds it, the internal measuring instrument may fall out of the storage device, causing damage to the measuring instrument, with poor anti-falling effect and low protection level; 2. The existing storage device has poor anti-deformation performance. In order to protect the internal measuring instrument, the existing method mostly increases the wall thickness to improve the anti-deformation performance. This method increases the overall volume and weight of the storage device, affecting the movement of the operator and possibly affecting the survey efficiency; 3. The existing sealing structure of the storage device mostly uses a sealing rubber ring to achieve the connection and sealing between the upper box body and the lower box body, so as to improve the dust-proof and waterproof performance. However, this method has the situation that the sealing ring shifts and ages after long-term use, resulting in the damage of the sealing ring, affecting the sealing performance of the storage device, and causing the internal measuring instrument to be affected, with a short sealing service life. Utility Model Content

[0005] The present utility model aims at the deficiencies of the existing technology and provides a protective accessory box for measuring instruments, aiming to solve the technical problems of the existing protective accessory box for measuring instruments having no anti-disengagement structure, which may cause damage to the measuring instrument due to improper human operation, poor anti-deformation performance, and poor sealing performance.

[0006] The technical solution adopted by the present utility model to achieve the above object is:

[0007] A protective accessory box for measuring instruments includes a box body, the box body includes an upper cover and a lower cover, and a hinge structure, an anti-disengagement lock body structure and a sealing structure are provided between the upper cover and the lower cover; the upper cover and the lower cover are both provided with a strengthening structure and a buffer protection structure; the upper cover is further provided with a prompting component; the lower cover is further provided with a handle and a support foot component.

[0008] For further improvement, the hinge structure includes a plurality of hinge hinges, and the plurality of hinge hinges are composed of two plates and a rotating shaft. The rotating shaft is arranged between the two plates to form a rotational movable connection; one of the plates is riveted and fixed to the rear end face of the upper cover, and the other plate is riveted and fixed to the rear end face of the lower cover; the upper cover and the lower cover are both provided with grooves, the strengthening structure includes multiple honeycomb layers, and the multiple honeycomb layers are respectively arranged on the four inner side faces and the end faces of the grooves; the honeycomb layers are all connected by a plurality of hexagonal frames.

[0009] For further improvement, the sealing structure includes a sealing rubber ring, an annular groove and an annular protrusion. The annular groove is provided at the top edge of the groove of the lower cover, and the annular protrusion is provided at the bottom of the groove of the upper cover. The sealing rubber ring is provided on the top of the lower cover and outside the annular groove. The annular groove is provided with a first inclined surface, and the annular protrusion is provided with a second inclined surface that cooperates and fits with the first inclined surface.

[0010] For further improvement, the buffer protection structure is provided in the groove. The buffer protection structure includes a spring damping assembly and a connecting plate. The connecting plate is provided on the spring damping assembly. The spring damping assembly includes a plurality of damping sheets arranged in an array. Springs are provided above each damping sheet. The damping sheets are fixedly connected to the groove, between the damping sheets and the springs, and between the springs and the connecting plate by threaded connection structures. The connecting plates are all provided with cushion layers.

[0011] For further improvement, the cross-section of the cushion layer provided on the end face of the upper cover is an isosceles trapezoid structure, and the cushion layer is further provided with a wavy structure protrusion. The cushion layer on the end face of the lower cover is provided with a placement groove two with a cross-section of an isosceles trapezoid structure.

[0012] For further improvement, the cushion layer can be one of a rubber cushion layer or a sponge cushion layer.

[0013] For further improvement, a strip groove is provided on the front end face of the lower cover. The strip groove is provided with an elastic strip plate. One side of the elastic strip plate is connected to the top edge line of the strip groove. The anti-detachment lock body structure includes a first hook group, a second hook group, a first buckle group and a first buckle ring group. The first hook group and the first buckle group are provided on the elastic strip plate, and the second hook group and the first buckle ring group are provided on the front end face of the upper cover.

[0014] For further improvement, the first hook group includes two hooks one. Each hook one is provided with two vertically arrayed buckles one, and there is a spacing between the buckles one. The second hook group includes two hooks two. Each of the two hooks two is provided with a buckle two, which is used for snap connection with the buckle two when the upper cover and the lower cover are closed. The first buckle group includes two protrusions, which are arranged in an array between the two hooks one. The protrusions are all provided with arc-shaped grooves. The first buckle ring group includes two buckle rings, which are arranged in an array between the two hooks two and are respectively arranged on the protrusions. The buckle rings are rotatably connected to the upper cover.

[0015] For further improvement, both the first buckle block and the second buckle block are provided with inclined surfaces, and the edges of the convex blocks are also provided with arc surfaces; the buckle rings are also provided with elastic parts; a plurality of first springs are further arranged between the strip-shaped grooves and the elastic strip plates; the elastic strip plate is also provided with an operation part; the prompt component includes a plurality of fluorescent color prompt stickers, and the fluorescent color prompt stickers are fixed on the outer surface of the upper cover through back glue; the handle is a flexible belt handle.

[0016] For further improvement, the bottom of the lower cover is provided with a plurality of storage grooves, one end of the storage groove is provided with a first rotating shaft, and the other end of the storage groove is provided with an elastic protrusion. The elastic protrusion can be one of a rubber protrusion or an elastic sheet protrusion; the support foot component includes a plurality of support feet, one end of the support foot is provided with a through hole, and the support foot is rotationally connected to the rotating shaft through the through hole; the other end of the support foot is provided with an anti-slip sleeve; one end of the support foot is also provided with a spring top block.

[0017] Compared with the prior art, at least one of the above one or more technical solutions in the measurement instrument protection matching box provided by the embodiment of the present invention has the following technical effects:

[0018] 1. The present invention provides an anti-detachment function through the anti-detachment lock body structure composed of the first buckle hook group, the second buckle hook group, the first buckle block group and the first buckle ring group. The first buckle hook group and the second buckle hook group are used to achieve initial fixation. When the upper cover is initially covered, the first buckle block on the first buckle hook is connected to the second buckle block of the second buckle hook to achieve initial fixed connection. When the operator completely closes the cover, the second buckle block is buckled with the second buckle block. By setting the first buckle hook group and the second buckle hook group for anti-detachment, it is possible to prevent the situation that the upper cover and the lower cover are opened when held due to the operator not completely closing, providing protection performance, preventing the internal measuring instrument from falling, improving the accidental protection performance, and better protecting the measuring instrument;

[0019] 2. By setting a strengthening structure to increase the overall strength of the box body, better protect the internal measuring instrument, and effectively reduce the wall thickness, thereby reducing the overall weight of the box body, making it lighter and more convenient for the operator to move and carry;

[0020] 3. By setting a sealing structure to provide a double-sealing function, improving the sealing performance of the box body, thereby improving the waterproof and dust-proof performance. And when the sealing rubber ring ages, the fitting of the annular groove and the annular protrusion can provide a sealed connection, ensuring the sealing performance and protection performance, and extending the service life of the sealing structure. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the attached drawings required in the description of the embodiments or the prior art. Obviously, the attached drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other attached drawings can also be obtained based on these drawings.

[0022] Figure 1 Schematic diagram of the overall structure of the protective matching box for the measuring instrument in this embodiment;

[0023] Figure 2 Bottom view schematic diagram of the protective matching box for the measuring instrument in this embodiment;

[0024] Figure 3 Exploded view schematic diagram of the protective matching box for the measuring instrument in this embodiment;

[0025] Figure 4 is Figure 3 Enlarged schematic diagram of A in

[0026] Figure 5 Front view schematic diagram of the protective matching box for the measuring instrument in this embodiment;

[0027] Figure 6 is Figure 5 Cross-sectional view schematic diagram of A-A in

[0028] Figure 7 Schematic diagram of the structure of the upper cover in this embodiment. Detailed implementation manners

[0029] The following are only the preferred embodiments of the present utility model, and the protection scope of the present invention is not limited thereby.

[0030] Embodiment, referring to the attached Figures 1 to 7 As shown in the figure, a protective matching box 1 for a measuring instrument includes a box body 2. The box body 2 includes an upper cover 3 and a lower cover 4. A hinge structure 5, an anti-detachment lock body structure 6 and a sealing structure 7 are provided between the upper cover 3 and the lower cover 4; both the upper cover 3 and the lower cover 4 are provided with a strengthening structure 8 and a buffer protection structure 9; the upper cover 3 is further provided with a prompt component 30; the lower cover 4 is further provided with a handle 10 and a support foot component 11.

[0031] The hinge structure 5 includes a plurality of hinge leaves, and the plurality of hinge leaves are composed of two plates and a rotating shaft. The rotating shaft is arranged between the two plates to form a rotational movable connection. One of the plates is riveted and fixed to the rear end face of the upper cover 3, and the other plate is riveted and fixed to the rear end face of the lower cover 4. The upper cover 3 and the lower cover 4 are both provided with grooves 12. The strengthening structure 8 includes multiple honeycomb layers 80, and the multiple honeycomb layers 80 are respectively arranged on the four inner side faces and the end faces of the grooves 12. The honeycomb layers 80 are all connected by a plurality of hexagonal frames. The strengthening structure 8 is used to increase the overall strength of the box body 2, better protect the internal measuring instruments, and effectively reduce the wall thickness, thereby reducing the overall weight of the box body 2 and making it more portable.

[0032] The sealing structure 7 includes a sealing rubber ring 70, an annular groove 71 and an annular protrusion 72. The annular groove 71 is arranged at the top edge of the groove 12 of the lower cover 4, and the annular protrusion 72 is arranged at the bottom of the groove 12 of the upper cover 3. The sealing rubber ring 70 is arranged on the top of the lower cover 4 and is arranged outside the annular groove 71. The annular groove 71 is provided with a first inclined surface 710, and the annular protrusion 72 is provided with a second inclined surface 711 that fits and cooperates with the first inclined surface 710. The sealing structure 7 is used to provide a double-sealing effect, improve the sealing performance of the box body 2, thereby improving the waterproof performance and dustproof performance. And when the sealing rubber ring 70 ages, the fitting of the annular groove 71 and the annular protrusion 72 can provide a sealed connection, ensure the sealing performance and protection performance, and extend the service life of the sealing structure 7.

[0033] The buffer protection structure 9 is arranged in the groove 12. The buffer protection structure 9 includes a spring damping component 90 and a connecting plate 91. The connecting plate 91 is arranged on the spring damping component 90. The spring damping component 90 includes a plurality of damping sheets arranged in an array. Springs are arranged above the damping sheets. The damping sheets are fixedly connected to the groove, between the damping sheets and the springs, and between the springs and the connecting plate by a threaded connection structure. The connecting plates 91 are all provided with cushions 902. The buffer protection structure 9 is used for buffering and protecting.

[0034] Among them, the cross-section of the cushion 902 arranged on the end face of the upper cover 3 is an isosceles trapezoid structure, and the cushion 902 is further provided with a wavy structure protrusion 902a. The cushion 902 on the end face of the lower cover 4 is provided with a placement groove two 902b with a cross-section of an isosceles trapezoid structure. The placement groove two 902b is used for positioning, and the wavy structure protrusion 902a is used for anti-slip and pressing the measuring instrument, reducing shaking and better protecting the measuring instrument.

[0035] The cushion 902 can be one of a rubber cushion or a sponge cushion.

[0036] The front end face of the lower cover 4 is provided with a strip-shaped groove 40, and the strip-shaped groove 40 is provided with an elastic strip-shaped plate 41. One side of the elastic strip-shaped plate 41 is connected to the top side line of the strip-shaped groove 40; the anti-disengagement locking body structure 6 includes a first hook group 60, a second hook group 61, a first buckle group 62 and a first buckle ring group 63; the first hook group 60 and the first buckle group 62 are arranged on the elastic strip-shaped plate 41, and the second hook group 61 and the first buckle ring group 63 are arranged on the front end face of the upper cover 3.

[0037] The first hook group 60 includes two hooks 600, and each hook 600 is provided with two vertically arrayed first buckles 601, and there is a spacing between the first buckles 601; the second hook group 61 includes two hooks 610, and both of the two hooks 610 are provided with second buckles 611, and the second buckles 611 are used for snap connection with the second buckles 611 when the upper cover 3 and the lower cover 4 are closed; the first buckle group 62 includes two protrusions 620, and the two protrusions 620 are arranged in an array between the two hooks 600; each protrusion 620 is provided with an arc-shaped groove 621, and the arc-shaped groove 621 is used for the insertion and fixation of the buckle ring 630; the first buckle ring group 63 includes two buckle rings 630, and the two buckle rings 630 are arranged in an array between the two hooks 610 and are respectively arranged on the protrusions 620. The buckle ring 630 is rotatably connected to the upper cover 3. The first hook group 60 and the second hook group 61 are used to achieve the initial fixation function. When the upper cover 3 is initially covered, the first first buckle 601 on the hook 600 is connected to the second buckle 611 of the hook 610 to achieve the initial fixed connection. When the operator completely closes the cover, the second buckle 611 is buckled with the second first buckle 601. By setting the first hook group 60 and the second hook group 61 for the anti-disengagement function, it is possible to prevent the situation that the upper cover 3 and the lower cover 4 are opened when held due to the operator not completely closing them, providing a protection performance to prevent the internal measuring instrument from falling.

[0038] Both the first buckle 601 and the second buckle 611 are provided with inclined surfaces, which facilitate guiding. The edges of the convex blocks 620 are also provided with arc-shaped surfaces, which facilitate the insertion of the buckle rings 630. The buckle rings 630 are also provided with elastic parts, which are used to play a certain deformation role, so as to facilitate the combination and locking or loosening of the upper cover 3 and the lower cover 4. A plurality of first springs 42 are further provided between the strip-shaped grooves 40 and the elastic strip plates 41. The first springs 42 are used to provide elastic force, so as to improve the reset elastic force of the elastic strip plates 41. The elastic strip plate 41 is also provided with an operation part 410, which is used to control the unlocking of the anti-detachment lock body structure 6. The prompt component 30 includes a plurality of fluorescent color prompt stickers, which are fixed on the outer surface of the upper cover 3 through adhesive. The prompt component 30 is used to play a fluorescent prompt or fluorescence prompt role, which is convenient for searching and at the same time, know the position of the upper cover 3, so as to facilitate possible operations. The handle 10 is a flexible belt handle.

[0039] A plurality of storage grooves 44 are provided at the bottom of the lower cover 4. One end of the storage groove 44 is provided with a first rotating shaft, and the other end of the storage groove 44 is provided with an elastic protrusion 440. The elastic protrusion 440 can be one of a rubber protrusion or an elastic sheet protrusion. The support foot assembly 11 includes a plurality of support feet. One end of the support foot is provided with a through hole, and the support foot is rotationally connected to the rotating shaft through the through hole. The other end of the support foot is provided with an anti-slip sleeve. One end of the support foot is also provided with a spring top block. The support foot assembly 11 is used to play a role of supporting and raising.

[0040] The utility model provides an anti-detachment function through an anti-detachment lock body structure composed of a first hook group, a second hook group, a first buckle group and a first buckle ring group. The first hook group and the second hook group are used to achieve the initial fixation function. When the upper cover is initially covered, the first buckle 601 on the first hook is connected to the second buckle 611 of the second hook to achieve the initial fixed connection. When the operator completely closes the cover, the second buckle 611 is buckled with the second buckle 601. By setting the first hook group and the second hook group for anti-detachment, it is possible to prevent the situation that the upper cover and the lower cover are opened when held due to the incomplete closing by the operator, providing a protection performance, preventing the internal measuring instrument from falling, improving the accidental protection performance, and better protecting the measuring instrument. By setting a strengthening structure, the overall strength of the box body is increased, the internal measuring instrument is better protected, and the wall thickness is effectively reduced, thereby reducing the overall weight of the box body, making it lighter and more convenient for the operator to move and carry. By setting a sealing structure, a double-sealing function is provided, the sealing performance of the box body is improved, thereby improving the waterproof performance and dust-proof performance. And when the sealing rubber ring ages, the fitting of the annular groove and the annular protrusion can provide a sealed connection, ensuring the sealing performance and protection performance, and prolonging the service life of the sealing structure.

[0041] The present utility model is not limited to the above embodiments. Other protective matching boxes for measuring instruments obtained by adopting the same or similar structures or devices as those in the above embodiments of the present utility model are all within the protection scope of the present utility model.

Claims

1. A measuring instrument protection box, characterized in that: The measuring instrument protection box includes a box body, which includes an upper cover and a lower cover, and a hinge structure, an anti-drop lock structure and a sealing structure are provided between the upper cover and the lower cover; the upper cover and the lower cover are both provided with a reinforcement structure and a buffer protection structure; the upper cover is also provided with a prompt component; the lower cover is also provided with a handle and a support foot component.

2. The measuring instrument protection box according to claim 1 is characterized in that: The hinge structure includes a plurality of hinges, which are composed of two plates and a rotating shaft, and the rotating shaft is arranged between the two plates to form a rotating movable connection; one of the plates is riveted and fixed to the rear end face of the upper cover, and the other plate is riveted and fixed to the rear end face of the lower cover; the upper cover and the lower cover are both provided with grooves, and the reinforcement structure includes multiple layers of honeycomb layers, which are respectively arranged on the four inner side faces and end faces of the grooves; the honeycomb layers are each connected by multiple hexagonal frames.

3. The measuring instrument protection box according to claim 2 is characterized in that: The sealing structure includes a sealing rubber ring, an annular groove and an annular protrusion, the annular groove is arranged at the top edge of the groove of the lower cover, and the annular protrusion is arranged at the bottom of the groove of the upper cover; the sealing rubber ring is arranged on the top of the lower cover and on the outer side of the annular groove; the annular groove is provided with a first inclined surface, and the annular protrusion is provided with a second inclined surface that cooperates with the first inclined surface.

4. The measuring instrument protection box according to claim 3 is characterized in that: The buffer protection structure is arranged in the groove; the buffer protection structure includes a spring damping assembly and a connecting plate, and the connecting plate is arranged on the spring damping assembly; the spring damping assembly includes a plurality of damping plates arranged in an array, and springs are arranged above the damping plates, and the damping plates and the grooves, the damping plates and the springs, and the springs and the connecting plates are all fixedly connected by threaded connection structures; the connecting plates are provided with cushion layers.

5. The measuring instrument protection box according to claim 4 is characterized in that: The cushion layer arranged on the end surface of the upper cover has an isosceles trapezoidal structure in cross section, and the cushion layer is also provided with a wavy structure protrusion; the cushion layer on the end surface of the lower cover is provided with a placement groove 2 with an isosceles trapezoidal structure in cross section.

6. The measuring instrument protection box according to claim 5, characterized in that: The cushion layer may be a rubber cushion layer or a sponge cushion layer.

7. The measuring instrument protection box according to claim 6, characterized in that: The front end surface of the lower cover is provided with a strip groove, and the strip groove is provided with an elastic strip plate, one side of the elastic strip plate is connected to the top edge line of the strip groove; the anti-detachment lock body structure includes a buckle hook group 1, a buckle hook group 2, a buckle block group 1 and a buckle ring group 1; the buckle hook group 1 and the buckle block group 1 are arranged on the elastic strip plate, and the buckle hook group 2 and the buckle ring group 1 are arranged on the front end surface of the upper cover.

8. The measuring instrument protection box according to claim 7, characterized in that: The buckle hook group 1 includes two buckle hooks 1, each of which is provided with two buckle blocks 1 in a vertical array, and a spacing is provided between the buckle blocks 1; the buckle hook group 2 includes two buckle hooks 2, each of which is provided with a buckle block 2, and the buckle block 2 is used to buckle and connect with the buckle block 2 when the upper cover and the lower cover are closed; the buckle block group 1 includes two protrusions, and the two protrusions are arranged in an array between the two buckle hooks 1; the protrusions are provided with an arc-shaped groove; the buckle ring group 1 includes two buckle rings, and the two buckle rings are arranged in an array between the two buckle hooks 2 and are respectively arranged on the protrusions, and the buckle rings are rotatably connected to the upper cover.

9. The measuring instrument protection box according to claim 8, characterized in that: The buckle block one and the buckle block two are both provided with inclined surfaces, and the edge lines of the protrusions are also provided with arc surfaces; the buckles are also provided with elastic parts; a plurality of springs are also provided between the strip grooves and the elastic strip plates; the elastic strip plates are also provided with operating parts; the prompt component includes a plurality of fluorescent color prompt stickers, and the fluorescent color prompt stickers are fixed on the outer surface of the upper cover by adhesive backing; the handle is a flexible belt handle.

10. The measuring instrument protection box according to claim 9, characterized in that: The bottom of the lower cover is provided with a plurality of storage grooves, one end of the storage groove is provided with a rotating shaft, and the other end of the storage groove is provided with an elastic protrusion, and the elastic protrusion can be a rubber protrusion or an elastic sheet protrusion; the supporting foot assembly includes a plurality of supporting feet, one end of the supporting foot is provided with a through hole, and the supporting foot is rotatably connected with the rotating shaft through the through hole; the other end of the supporting foot is provided with an anti-slip sleeve; one end of the supporting foot is also provided with a top block with a spring.

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