Vertical jack with extensible top

Abstract

The utility model discloses a vertical jack with an extensible top, which comprises a vertical jack body, a piston rod is arranged on the vertical jack body, an ejector head component is arranged at the top end of the piston rod, a threaded column is arranged on the ejector head component, and the threaded column is connected with the piston rod. One end of the threaded column is mounted in a threaded hole in the center of the top end of the piston rod, a top plate is mounted at the other end of the threaded column, a movable sleeve and a threaded sleeve are arranged on the circumferential outer wall of the threaded column, the movable sleeve is located at the top of the threaded sleeve, and mounting grooves distributed in an annular array are formed in the top of the top plate. And a first moving plate and a second moving plate are mounted in the mounting groove. According to the utility model, not only is the stability of the connection between the ejector head assembly and the piston rod effectively improved, but also the supporting range between the ejector head assembly and a supported object can be adjusted, the supported object is ensured to be uniformly stressed, and the damage caused by overlarge local pressure is prevented.

Description

Technical Field

[0001] This utility model relates to the technical field of vertical jacks, specifically a vertical jack with an extendable top. Background Technology

[0002] Vertical jacks, as a common mechanical lifting tool, are widely used in fields such as automobile repair, construction, and equipment installation. They lift heavy objects by extending and retracting the piston rod, providing crucial support and height adjustment for various engineering operations. The piston rod of a vertical jack is usually fitted with a fixed jack head.

[0003] A search revealed that patent publication number CN216638776U discloses a vertical jack with an extendable top. The jack includes a main body with a lifting column that moves vertically up and down. It also includes a first extension column and a second extension column of unequal height. Both the first and second extension columns have connecting columns at their bottoms. The top of the lifting column has a guide hole for inserting the connecting column. The bottom of the connecting column has a pin hole, and the main body of the jack has a positioning pin for inserting into the pin hole. The positioning pin has an elastic element, including a connecting piece at the top of the positioning pin, and elastic tabs extending from both sides of the connecting piece, with their upper ends close to the positioning pin and gradually moving downwards away from it. This vertical jack features an extendable maximum lifting height, flexible use, wide applicability, comprehensive overall functionality, and strong practicality.

[0004] In practical applications, existing vertical jacks typically use fixed-size jack heads. These fixed-size jack heads cannot adapt to objects of different sizes, making it difficult to flexibly adjust the support range according to the size of the supported object. Different sized jack heads need to be replaced based on the size of the supported object, resulting in low versatility. The connection between the jack head and the piston rod on the vertical jack is generally a threaded connection. When the vertical jack is subjected to a large load or uneven external force, the threaded connection is prone to stripping, affecting the stability and safety of the lifting operation. Therefore, a vertical jack with an extendable top is designed. Utility Model Content

[0005] In view of the defects or shortcomings of the existing vertical jacks, the purpose of this utility model is to provide a vertical jack with an extendable top, which not only effectively improves the stability of the connection between the jack assembly and the piston rod, but also adjusts the support range between the jack assembly and the supported object, ensuring that the supported object is subjected to uniform force.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a vertical jack with an extendable top, including a vertical jack body, a piston rod on the vertical jack body, a top head assembly on the top of the piston rod, a threaded post on the top head assembly, one end of the threaded post being installed in a threaded hole at the center of the top of the piston rod, and a top plate being installed on the other end of the threaded post. A movable sleeve and a threaded sleeve are provided on the circumferential outer wall of the threaded post, and the movable sleeve is located at the top of the threaded sleeve.

[0008] The top of the top plate is provided with mounting slots arranged in a ring array. A first movable plate and a second movable plate are installed inside the mounting slots, and the first movable plate is located on one side of the second movable plate. The second movable plate is movably connected to the movable sleeve through a movable connecting rod.

[0009] A first spring is provided on the outer side of the circumferential outer wall of the threaded cylinder, and the first spring is located between the bottom end of the threaded sleeve and the top end of the piston rod.

[0010] Preferably, threaded holes are provided on both sides of the outer circumferential wall of the threaded sleeve, and adjusting bolts are installed in the threaded holes on the outer wall of the threaded sleeve.

[0011] Preferably, the bottom end of the second movable plate is provided with a first connecting block, the bottom end of the first connecting block passes through the second limiting groove and is movably connected to one end of the movable connecting rod through a movable pin, the second limiting groove is arranged in a ring array at the bottom of the top plate and is connected to the mounting groove, the other end of the movable connecting rod is movably connected to the second connecting block through a movable pin, and the second connecting block is arranged in a ring array on the circumferential outer wall of the movable sleeve.

[0012] Preferably, a limiting post is installed on one end wall of the first movable plate, and the other end of the limiting post is located in the mounting hole. The mounting hole is opened on the end wall of one end of the mounting groove. A third spring is provided in the mounting hole, and the third spring is located on the outer side of the circumferential outer wall of the limiting post.

[0013] Preferably, a first limiting block is installed on each of the two outer walls of the first movable plate, and a second limiting block is installed on each of the two outer walls of the second movable plate. The other ends of the first and second limiting blocks are installed in the first limiting groove, and the outer walls of the first and second limiting blocks are clearance-fitted with the groove wall of the first limiting groove. The first limiting groove is opened on both sides of the groove wall of the mounting groove, and the outer walls of the first and second movable plates are clearance-fitted with the groove wall of the mounting groove.

[0014] Preferably, a second spring is provided on the outer side of the circumferential outer wall of the threaded column, and the second spring is located between the bottom end of the top plate and the top end of the movable sleeve.

[0015] Compared with existing technologies, one or more of the above technical solutions have the following beneficial effects:

[0016] 1. In this utility model, through a series of coordinated structural arrangements, when the worker needs to adjust the support range of the top plate on the supported object, the worker rotates the adjusting bolt to release the tightness between the threaded sleeve and the threaded column. The worker then rotates the threaded sleeve via the adjusting bolt. As the threaded sleeve rotates, it moves upwards or downwards towards the threaded column. This upward or downward movement of the threaded sleeve causes the moving sleeve to move upwards or downwards. This upward or downward movement of the moving sleeve, through the movable connecting rod, drives the second moving plate to move outwards or inwards within the mounting groove. This outward or inward movement of the second moving plate within the mounting groove adjusts the support range of the top plate on the supported object. When the worker moves the second moving plate outwards within the mounting groove, the support range of the top plate on the supported object is increased. This allows for adjustment of the support range between the top assembly and the supported object, ensuring uniform force distribution on the supported object, preventing damage caused by excessive local pressure, and improving the versatility and applicability of this utility model.

[0017] 2. In this utility model, through a series of structural arrangements, when the operator needs to adjust the maximum lifting height of this utility model, the operator can adjust the distance between the top plate and the top of the piston rod by rotating the threaded column. The distance between the top plate and the top of the piston rod can be adjusted, thereby adjusting the maximum lifting height of this utility model. Furthermore, the coordinated arrangement of the first spring and the second spring, etc., with the first spring and the second spring in a compressed state, will generate radial force, which will increase the friction between the threaded column and the threaded hole on the piston rod, effectively preventing the thread from slipping between the threaded column and the threaded hole on the piston rod. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the connection structure between the piston rod and the mandrel assembly of this utility model.

[0021] Figure 3 This is a cross-sectional view of the connection structure between the piston rod and the mandrel assembly of this utility model.

[0022] Figure 4 This is an exploded structural diagram of the top plate of this utility model.

[0023] In the picture:

[0024] 100. Vertical jack body; 110. Piston rod;

[0025] 200. Top assembly; 210. Threaded post; 220. First spring; 230. Threaded sleeve; 231. Adjusting bolt; 240. Moving sleeve; 250. Second spring; 260. Movable connecting rod; 270. Top plate; 271. First moving plate; 2711. First limiting block; 2712. Limiting post; 272. Second moving plate; 2721. Second limiting block; 273. Third spring; 274. First limiting groove; 275. Second limiting groove; 276. Mounting groove; 277. Mounting hole. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] like Figure 1-4 As shown, a vertical jack with an extendable top includes a vertical jack body 100, a piston rod 110 on the vertical jack body 100, a top head assembly 200 on the top of the piston rod 110, a threaded post 210 on the top head assembly 200, one end of the threaded post 210 being installed in a threaded hole at the center of the top of the piston rod 110, and the threaded post 210 and the threaded hole on the piston rod 110 being connected by a threaded fit, so that the operator can adjust the distance between the top plate 270 and the top of the piston rod 110 by rotating the threaded post 210, the other end of the threaded post 210 being installed with the top plate 270, and a movable sleeve 240 and a threaded sleeve 230 being provided on the circumferential outer wall of the threaded post 210, with the movable sleeve 240 located on top of the threaded sleeve 230;

[0030] The top of the top plate 270 is provided with mounting grooves 276 arranged in a ring array. A first movable plate 271 and a second movable plate 272 are installed inside the mounting grooves 276. The first movable plate 271 is located on one side of the second movable plate 272. The second movable plate 272 is movably connected to the movable sleeve 240 through a movable connecting rod 260. When the movable sleeve 240 moves up or down along the threaded post 210, it will drive the second movable plate 272 to move outward or inward within the mounting groove 276 through the movable connecting rod 260.

[0031] A first spring 220 is provided on the outer side of the circumferential outer wall of the threaded column 210, and the first spring 220 is located between the bottom end of the threaded sleeve 230 and the top end of the piston rod 110.

[0032] The threaded sleeve 230 has threaded holes on both sides of its circumferential outer wall. An adjusting bolt 231 is installed in the threaded hole on the outer wall of the threaded sleeve 230. The adjusting bolt 231 can make the threaded sleeve 230 and the threaded post 210 in a tight state. The adjusting bolt 231 can also be used as a handle for rotating the threaded sleeve 230, which makes it convenient for the operator to rotate the threaded sleeve 230.

[0033] The bottom end of the second movable plate 272 is provided with a first connecting block. The bottom end of the first connecting block passes through the second limiting groove 275 and is movably connected to one end of the movable connecting rod 260 through a movable pin. The second limiting groove 275 is arranged in a ring array at the bottom of the top plate 270 and is connected to the mounting groove 276. The other end of the movable connecting rod 260 is movably connected to the second connecting block through a movable pin, and the second connecting block is arranged in a ring array on the circumferential outer wall of the movable sleeve 240.

[0034] A limiting post 2712 is installed on one end wall of the first movable plate 271, and the other end of the limiting post 2712 is located in the mounting hole 277. The mounting hole 277 is opened on the end wall of one end of the mounting groove 276. A third spring 273 is provided in the mounting hole 277, and the third spring 273 is located on the outer side of the circumferential outer wall of the limiting post 2712.

[0035] First limiting blocks 2711 are installed on both outer walls of the first movable plate 271, and second limiting blocks 2721 are installed on both outer walls of the second movable plate 272. The other ends of the first limiting blocks 2711 and the second limiting blocks 2721 are installed in the first limiting groove 274. The outer walls of the first limiting blocks 2711 and the second limiting blocks 2721 are clearance-fitted with the groove wall of the first limiting groove 274. The first limiting groove 274 is opened on both sides of the groove wall of the mounting groove 276. The outer walls of the first movable plate 271 and the second movable plate 272 are clearance-fitted with the groove wall of the mounting groove 276. Because the outer walls of the first movable plate 271 and the second movable plate 272 are clearance-fitted with the groove wall of the mounting groove 276, and the outer walls of the first limiting blocks 2711 and the second limiting blocks 2721 are clearance-fitted with the groove wall of the first limiting groove 274, the movement of the first movable plate 271 and the second movable plate 272 can be limited and guided.

[0036] A second spring 250 is provided on the outer side of the circumferential outer wall of the threaded column 210, and the second spring 250 is located between the bottom end of the top plate 270 and the top end of the movable sleeve 240.

[0037] Working Principle: In use, when the operator needs to adjust the support range of the top plate 270 on the supported object, the operator rotates the adjusting bolt 231 to release the tightness between the threaded sleeve 230 and the threaded post 210. The operator then rotates the threaded sleeve 230 via the adjusting bolt 231. This rotation causes the threaded sleeve 230 to move upwards or downwards within the threaded post 210. This upward or downward movement of the threaded sleeve 230 causes the movable sleeve 240 to move upwards or downwards. This upward or downward movement of the movable sleeve 240, via the movable connecting rod 260, drives the second movable plate 272 to move outwards or inwards within the mounting groove 276. This outward or inward movement of the second movable plate 272 within the mounting groove 276 adjusts the support range of the top plate 270 on the supported object. When the operator moves the second movable plate 272 outwards within the mounting groove 276… This design increases the support range of the top plate 270 on the supported object, thereby adjusting the support range between the top assembly 200 and the supported object. This ensures uniform force on the supported object, prevents damage caused by excessive local pressure, and improves the versatility and applicability of the invention. When the operator needs to adjust the maximum lifting height of the invention, rotating the threaded column 210 adjusts the distance between the top plate 270 and the top of the piston rod 110. The adjustable distance between the top plate 270 and the top of the piston rod 110 allows for adjustment of the maximum lifting height. Furthermore, the coordinated arrangement of the first spring 220 and the second spring 250, with the first spring 220 and the second spring 250 in a compressed state, generates radial force, increasing the friction between the threaded column 210 and the threaded hole on the piston rod 110. This effectively prevents slippage between the threaded column and the threaded hole on the piston rod 110.

[0038] The above description is merely a preferred embodiment of this utility model and is not intended to limit the invention. For those skilled in the art, various modifications and variations can be made to this invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the protection scope of this invention.

Claims

1. A top extendable vertical jack comprising a vertical jack body (100), characterized in that: The vertical jack body (100) is provided with a piston rod (110), the top end of the piston rod (110) is provided with a top head assembly (200), the top head assembly (200) is provided with a threaded post (210), one end of the threaded post (210) is installed in the threaded hole at the center position of the top end of the piston rod (110), the other end of the threaded post (210) is provided with a top plate (270), the circumferential outer wall of the threaded post (210) is provided with a movable sleeve (240) and a threaded sleeve (230), and the movable sleeve (240) is located on the top of the threaded sleeve (230); The top plate (270) has a mounting groove (276) arranged in a ring array. A first movable plate (271) and a second movable plate (272) are installed inside the mounting groove (276). The first movable plate (271) is located on one side of the second movable plate (272). The second movable plate (272) is movably connected to the movable sleeve (240) through a movable connecting rod (260). A first spring (220) is provided on the outer side of the circumferential outer wall of the threaded column (210), and the first spring (220) is located between the bottom end of the threaded sleeve (230) and the top end of the piston rod (110).

2. The top yieldable vertical jack of claim 1, wherein: The threaded sleeve (230) has threaded holes on both sides of its circumferential outer wall, and an adjusting bolt (231) is installed in the threaded hole on the outer wall of the threaded sleeve (230).

3. The top yieldable vertical jack of claim 1 wherein: The bottom end of the second movable plate (272) is provided with a first connecting block. The bottom end of the first connecting block passes through the second limiting groove (275) and is movably connected to one end of the movable connecting rod (260) through a movable pin. The second limiting groove (275) is arranged in a ring array at the bottom of the top plate (270), and the second limiting groove (275) is connected to the mounting groove (276). The other end of the movable connecting rod (260) is movably connected to the second connecting block through a movable pin, and the second connecting block is arranged in a ring array on the circumferential outer wall of the movable sleeve (240).

4. The top yieldable vertical jack of claim 1 wherein: A limiting post (2712) is installed on one end wall of the first movable plate (271), and the other end of the limiting post (2712) is located in the mounting hole (277). The mounting hole (277) is opened on the end wall of one end of the mounting groove (276). A third spring (273) is provided in the mounting hole (277), and the third spring (273) is located on the outer side of the circumferential outer wall of the limiting post (2712).

5. The top yieldable vertical jack of claim 1 wherein: First limiting blocks (2711) are installed on both outer walls of the first movable plate (271), and second limiting blocks (2721) are installed on both outer walls of the second movable plate (272). The other ends of the first limiting blocks (2711) and the second limiting blocks (2721) are installed in the first limiting groove (274). The outer walls of the first limiting blocks (2711) and the second limiting blocks (2721) are clearance-fitted with the groove wall of the first limiting groove (274). The first limiting groove (274) is opened on both sides of the groove wall of the mounting groove (276). The outer walls of the first movable plate (271) and the second movable plate (272) are clearance-fitted with the groove wall of the mounting groove (276).

6. The top yieldable vertical jack of claim 1 wherein: A second spring (250) is provided on the outer side of the circumferential outer wall of the threaded column (210), and the second spring (250) is located between the bottom end of the top plate (270) and the top end of the movable sleeve (240).

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