A roof prop with adjustable initial length

Abstract

The application provides a length-adjustable roof prop, which comprises an outer sleeve, an inner sleeve, a connecting pipe and a sliding pipe, one end of the outer sleeve is connected with an output shaft of a hydraulic jacking assembly, the inner sleeve is installed on the inner side of the end of the outer sleeve far from the hydraulic jacking assembly, a plurality of annular grooves are formed on the outer side wall of the inner sleeve, one end of the connecting pipe is connected with the outer sleeve, a plurality of mounting holes corresponding to the annular grooves are formed on the side wall of the connecting pipe, a limiting ball is arranged on the inner side of the mounting hole, and the diameter of the limiting ball is larger than the wall thickness of the connecting pipe, an annular limiting boss matched with the connecting pipe is fixedly arranged on the inner side of the sliding pipe, the sliding pipe is movably connected with the outer side of the connecting pipe, and when the annular limiting boss corresponds to the position of the mounting hole, the limiting ball is partially located on the inner side of the annular groove. The length-adjustable roof prop has the beneficial effects that the limiting state of the inner sleeve can be adjusted by moving the sliding pipe, the length of the roof prop can be adjusted by moving the inner sleeve, the roof prop is suitable for different rescue and roof prop working conditions, the adjusting process is convenient, and the working efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of rescue tool technology, and in particular relates to a jack with an adjustable initial length. Background Technology

[0002] Hydraulic jacks, also known as hydraulic jacking devices or hydraulic jacks, are used in emergency rescue operations to lift, support, and stabilize vehicles, components, or other objects to be jacked. For example, they can be used to jack up the body, doors, pillars, and other parts of damaged vehicles to create rescue space or prevent the objects to be rescued from further deformation or collapse.

[0003] Existing jacking devices typically use hydraulic jacking components to directly drive the extension and retraction of the jacking rod or support arm. Their initial length or initial jacking height is often difficult to adjust quickly. When the initial distance between the surface to be jacked and the jacking device's support head is large, a long unloaded extension of the hydraulic jacking components is required before the support head can contact the surface and begin actual jacking operations. To adapt to different initial distances, existing technologies typically adjust the initial height by adding extension rods to the jacking device. However, adding extension rods requires additional rods of different specifications. Especially in rescue scenarios such as traffic accidents and building collapses, where the environment is complex and rescue time is tight, existing jacking devices cannot quickly adjust their initial length according to the object to be jacked, limiting the efficiency of rescue jacking operations. Summary of the Invention

[0004] In view of this, the present invention aims to provide a support with an adjustable initial length in order to solve at least one of the aforementioned technical problems.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] An adjustable initial length support includes:

[0007] An outer tube, one end of which is connected to the output shaft of the hydraulic lifting assembly;

[0008] The inner sleeve is installed on the inner side of the outer sleeve at the end away from the hydraulic lifting assembly, and multiple annular grooves are opened on the outer wall of the inner sleeve.

[0009] A connecting tube, one end of which is connected to an outer sleeve, has multiple mounting holes on its side wall corresponding to an annular groove, and a limiting ball is provided inside the mounting hole, the diameter of which is greater than the wall thickness of the connecting tube.

[0010] The slide tube has an annular limiting boss that matches the connecting tube fixed on its inner side. The slide tube is movably connected to the outer side of the connecting tube. When the position of the annular limiting boss corresponds to the position of the mounting hole, the limiting ball part is located inside the annular groove.

[0011] Furthermore, the inner side of the outer sleeve away from the hydraulic lifting assembly has an installation groove, and the end of the connecting pipe near the outer sleeve is fixed with a threaded part, which is threadedly connected to the inner side of the installation groove.

[0012] An annular guide boss is fixed on the outer side of one end of the connecting pipe near the outer sleeve. The outer diameter of the annular guide boss matches the inner diameter of the sliding pipe. The end of the sliding pipe near the outer sleeve is located on the outer side of the annular guide boss.

[0013] The inner diameter of the connecting pipe matches the outer diameter of the inner sleeve.

[0014] Furthermore, a compression spring is provided on the outside of the connecting pipe, and the compression spring is located between the annular guide boss and the annular limiting boss;

[0015] The connecting tube has an annular retaining spring mounting groove on the outer side of the end away from the outer tube, and a shaft retaining spring is provided on the inner side of the annular retaining protrusion. The shaft retaining spring limits the end face of the annular limiting protrusion away from the outer tube.

[0016] Furthermore, the annular guide boss has a threaded groove on its side wall, and a limit pin is threadedly connected in the threaded groove. The limit pin limits the end face of the slide tube near the outer sleeve.

[0017] The end face of the slide tube near the outer tube has a positioning groove corresponding to the limiting pin. When the limiting pin is located inside the positioning groove, the annular limiting boss is located on the side of the mounting hole near the outer tube.

[0018] Furthermore, the axis of the mounting hole is perpendicular to the axis of the connecting pipe, and the axis of the mounting hole intersects with the axis of the connecting pipe. The mounting hole is a tapered hole, and the diameter of the mounting hole at one end near the axis of the connecting pipe is smaller than the diameter at the other end.

[0019] Multiple annular grooves are evenly arranged along the length of the inner sleeve;

[0020] Multiple mounting holes are evenly arranged circumferentially along the axis of the connecting pipe, and each mounting hole is equipped with a limiting ball;

[0021] The cross-section of the annular groove is an arc shape that matches the limiting ball, and the depth of the annular groove is less than the radius of the limiting ball;

[0022] The inner diameter of the annular limiting boss matches the outer diameter of the connecting pipe, and the height of the annular limiting boss is greater than the depth of the annular groove.

[0023] Furthermore, the outer edge of the annular limiting boss at the end away from the outer sleeve has a chamfered structure.

[0024] Furthermore, the inner sleeve is provided with a support head at the end away from the hydraulic lifting assembly, and a connecting column is fixed at the end of the support head near the inner sleeve. The diameter of the connecting column matches the inner diameter of the inner sleeve, and the connecting column is installed on the inner side of the inner sleeve.

[0025] Furthermore, the end of the support head furthest from the connecting column has a V-shaped groove.

[0026] Furthermore, the connecting post has a threaded hole, and a ball-head plunger is threaded into the threaded hole. The ball of the ball-head plunger protrudes from the side wall of the connecting post. The inner side of the inner sleeve has an annular limiting groove corresponding to the ball, and the ball is located inside the annular limiting groove.

[0027] Furthermore, the outer side of the slide tube has anti-slip texture.

[0028] Compared with the prior art, the adjustable initial length support device of the present invention has the following advantages:

[0029] The adjustable initial length jacking device of the present invention allows for adjustment of the limiting state of the inner sleeve by moving the sliding tube. Moving the inner sleeve adjusts the length of the jacking device, making it suitable for different rescue jacking conditions. The adjustment process is convenient and improves work efficiency. Attached Figure Description

[0030] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0031] Figure 1 This is a three-dimensional structural diagram of the support device according to an embodiment of the present invention;

[0032] Figure 2 As described in the embodiments of the present invention Figure 1 Schematic diagram of the structure at point A in the middle;

[0033] Figure 3 This is a partial cross-sectional structural diagram of the support device according to an embodiment of the present invention;

[0034] Figure 4 As described in the embodiments of the present invention Figure 3 Schematic diagram of the structure at point B;

[0035] Figure 5 As described in the embodiments of the present invention Figure 4 Schematic diagram of the structure at point C;

[0036] Figure 6 This is a schematic diagram of the three-dimensional structure of the support head according to an embodiment of the present invention;

[0037] Figure 7This is a schematic diagram of the three-dimensional structure of the slide tube according to an embodiment of the present invention;

[0038] Figure 8 This is a schematic diagram of the three-dimensional structure of the connecting pipe according to an embodiment of the present invention;

[0039] Figure 9 This is a schematic diagram of the three-dimensional structure of the inner sleeve according to an embodiment of the present invention.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1. Hydraulic lifting assembly; 2. Outer sleeve; 3. Support head; 4. Slide tube; 5. Connecting tube; 6. Limit pin; 7. Inner sleeve; 8. Compression spring; 9. Ball head plunger; 10. Limit ball; 11. Shaft circlip; 101. Output shaft; 301. V-groove; 302. Connecting post; 303. Threaded hole; 401. Positioning groove; 402. Anti-slip texture; 403. Annular limit boss; 501. Threaded part; 502. Threaded groove; 503. Annular guide boss; 504. Mounting hole; 505. Annular circlip mounting groove; 701. Annular groove; 702. Annular limit groove. Detailed Implementation

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] like Figures 1 to 9 As shown, an adjustable initial length jack includes: an outer sleeve 2, one end of which is connected to the output shaft 101 of a hydraulic jacking assembly 1; an inner sleeve 7, which is installed on the inner side of the end of the outer sleeve 2 away from the hydraulic jacking assembly 1, and has multiple annular grooves 701 on its outer side wall; a connecting pipe 5, one end of which is connected to the outer sleeve 2, and has multiple mounting holes 504 on its side wall corresponding to the annular grooves 701, with a limiting ball 10 inside the mounting hole 504, the diameter of the limiting ball 10 being larger than the wall thickness of the connecting pipe 5; and a sliding pipe 4, with an annular limiting boss 403 fixed inside the sliding pipe 4 that matches the connecting pipe 5, the sliding pipe 4 being movably connected to the outside of the connecting pipe 5, and when the annular limiting boss 403 corresponds to the mounting hole 504, the limiting ball 10 is partially located inside the annular groove 701.

[0047] The hydraulic lifting assembly 1 can use an existing manual hydraulic jack or an existing hydraulic cylinder.

[0048] An installation groove is opened on the inner side of the end of the outer sleeve 2 away from the hydraulic lifting component 1, and a threaded part is fixed on the end of the connecting pipe 5 near the outer sleeve 2, and the threaded part is threadedly connected to the inner side of the installation groove.

[0049] An annular guide boss 503 is fixedly provided on the outer side of the end of the connecting pipe 5 near the outer sleeve 2. The outer diameter of the annular guide boss 503 matches the inner diameter of the slide pipe 4. The end of the slide pipe 4 near the outer sleeve 2 is located on the outer side of the annular guide boss 503. The annular guide boss 503 plays a guiding role in the movement of the slide pipe 4, and the compression spring 8 is always located in the annular space formed between the slide pipe 4 and the connecting pipe 5 to prevent foreign objects from jamming the compression spring 8.

[0050] The inner diameter of the connecting pipe 5 matches the outer diameter of the inner sleeve 7.

[0051] A compression spring 8 is provided on the outside of the connecting tube 5, and the compression spring 8 is located between the annular guide boss 503 and the annular limiting boss 403. An annular retaining spring mounting groove 505 is opened on the outside of the end of the connecting tube 5 away from the outer tube 2. A shaft retaining spring 11 is provided on the inside of the annular retaining spring mounting groove 505. The shaft retaining spring 11 limits the end face of the annular limiting boss 403 away from the outer tube 2. Under the limit state, the annular limiting boss 403 presses against the shaft retaining spring 11 under the elastic force of the compression spring 8. When the limit state is released, the slide tube 4 moves towards the outer tube 2, the compression spring 8 is further compressed, and after the inner tube 7 moves to the designated position, the slide tube 4 is released and reset under the elastic force of the compression spring 8.

[0052] The annular guide boss 503 has a threaded groove 502 on its side wall. A limit pin 6 is threaded into the groove 502, limiting the end face of the slide tube 4 near the outer sleeve 2. A positioning groove 401 corresponding to the limit pin 6 is formed on the end face of the slide tube 4 near the outer sleeve 2. When the limit pin 6 is inside the positioning groove 401, the annular limit boss 403 is located on the side of the mounting hole 504 near the outer sleeve 2. The slide tube 4 can only move to a released-limit state where the annular limit boss 403 and the mounting hole 504 are not aligned, when the limit pin 6 is aligned with the positioning groove 401.

[0053] In some embodiments, the axis of the mounting hole 504 is perpendicular to the axis of the connecting pipe 5, and the axis of the mounting hole 504 intersects with the axis of the connecting pipe 5. The mounting hole 504 is a tapered hole, and the diameter of one end of the mounting hole 504 near the axis of the connecting pipe 5 is smaller than the diameter of the other end. The tapered hole plays a guiding role in the movement of the limiting ball 10 toward the annular groove 701.

[0054] The diameter of the mounting hole 504 near the axis of the connecting pipe 5 is smaller than the diameter of the limiting ball 10. When the inner sleeve is pulled out, the limiting ball 10 will not disengage from the mounting hole 504.

[0055] Multiple annular grooves 701 are evenly arranged along the length of the inner sleeve 7;

[0056] Multiple mounting holes 504 are evenly arranged circumferentially along the axis of the connecting pipe 5, and each mounting hole 504 is provided with a limiting ball 10;

[0057] The cross-section of the annular groove 701 (the cross-section through the axis of the inner sleeve 7) is an arc shape that matches the limiting ball 10. The depth of the annular groove 701 is less than the radius of the limiting ball 10. When the inner sleeve 7 is moved, the arc shape at the bottom of the annular groove 701 drives the limiting ball 10 to disengage from the annular groove 701.

[0058] The inner diameter of the annular limiting boss 403 matches the outer diameter of the connecting pipe 5, and the height of the annular limiting boss 403 is greater than the depth of the annular groove 701.

[0059] The outer edge of the annular limiting boss 403 away from the outer sleeve 2 is chamfered. When the limiting is released, the limiting ball 10 is located inside the sliding tube 4 away from the outer sleeve 2. When the limiting is restored, the limiting ball 10 is driven to move towards the axis of the connecting tube 5 under the guidance of the chamfered structure, and part of the limiting ball 10 enters the inner side of the annular groove 701.

[0060] The inner sleeve 7 is provided with a support head 3 at the end away from the hydraulic lifting component 1. A connecting post 302 is fixed at the end of the support head 3 near the inner sleeve 7. The diameter of the connecting post 302 matches the inner diameter of the inner sleeve 7. The connecting post 302 is installed on the inner side of the inner sleeve 7.

[0061] The end of the support head 3 away from the connecting column 302 has a V-shaped groove 301, which makes it easy to hold the top part to be supported (such as the A-pillar of a car).

[0062] The diameter of the connecting post 302 is smaller than the diameter of the support head 3. The connecting post 302 has a threaded hole 303, and a ball plunger 9 is internally threaded into the threaded hole 303. The ball of the ball plunger 9 protrudes from the side wall of the connecting post 302. The inner side of the inner sleeve 7 has an annular limiting groove 702 corresponding to the ball. The ball is located inside the annular limiting groove 702. The ball plunger 9 facilitates the installation and removal of the support head 3, and the support head 3 and the inner sleeve 7 can rotate relative to each other. It is suitable for different vehicle models and different support conditions.

[0063] The outer side of the slide tube 4 has anti-slip texture 402, which facilitates the movement of the slide tube 4.

[0064] Work process:

[0065] When the inner sleeve 7 is in the limiting state, under the elastic force of the compression spring 8, the annular limiting boss 403 presses against the shaft retaining ring 11. The position of the annular limiting boss 403 corresponds to the mounting hole 504. One part of the limiting ball 10 is located inside the mounting hole 504, and the other part of the limiting ball 10 is located inside the annular groove 701. The limiting ball 10 limits the inner sleeve 7. In this state, the inner sleeve 7 and the outer sleeve 2 cannot move relative to each other (but can rotate relative to each other).

[0066] When the limiting state is released, the rotating slide tube 4 aligns the limiting pin 6 with the positioning groove 401, and the slide tube 4 moves towards the outer sleeve 2. The position of the annular limiting boss 403 does not correspond to the mounting hole 504, and the compression spring 8 is further compressed. During the movement of the inner sleeve 7, under the guidance of the arc-shaped bottom end of the annular groove 701 and the conical structure of the mounting hole 504, the limiting ball 10 disengages from the annular groove 701. One part of the limiting ball 10 is located inside the mounting hole 504, and the other part of the limiting ball 10 is located inside the end of the slide tube 4 away from the outer sleeve 2. At this time, the inner sleeve 7 is released from the limiting state. The position of the inner sleeve 7 is adjusted according to the working conditions at the rescue site.

[0067] After the inner sleeve 7 moves to the designated position, the slide tube 4 is released and moves away from the outer sleeve 2 under the elastic force of the compression spring 8. Under the guidance of the chamfered structure of the annular limiting boss 403 and the conical structure of the mounting hole 504, the limiting ball 10 partially enters the inner side of the annular groove 701. The slide tube 4 is rotated so that the limiting pin 6 is not aligned with the positioning groove 401, and then it enters the inner sleeve 7 limiting state again.

[0068] The limit state of the inner sleeve 7 can be adjusted by moving the sliding tube 4. Moving the inner sleeve 7 adjusts the length of the jacking device, which is suitable for different rescue jacking conditions. The adjustment process is convenient and improves work efficiency.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A support device with an adjustable initial length, characterized in that, include: Outer tube (2), one end of which is connected to the output shaft (101) of the hydraulic lifting assembly (1); Inner sleeve (7), the inner sleeve (7) is installed on the inner side of the end of the outer sleeve (2) away from the hydraulic lifting assembly (1), and multiple annular grooves (701) are opened on the outer wall of the inner sleeve (7); A connecting pipe (5) is connected to an outer sleeve (2) at one end. The side wall of the connecting pipe (5) has multiple mounting holes (504) corresponding to the annular groove (701). A limiting ball (10) is provided inside the mounting hole (504). The diameter of the limiting ball (10) is greater than the wall thickness of the connecting pipe (5). The slide tube (4) has an annular limiting boss (403) that matches the connecting tube (5) fixed on its inner side. The slide tube (4) is movably connected to the outer side of the connecting tube (5). When the annular limiting boss (403) corresponds to the position of the mounting hole (504), the limiting ball (10) is located inside the annular groove (701).

2. The adjustable initial length support device according to claim 1, characterized in that: The outer sleeve (2) has an installation groove on the inner side of the end away from the hydraulic lifting assembly (1), and the connecting pipe (5) has a threaded part fixed on the end near the outer sleeve (2), and the threaded part is threaded to the inner side of the installation groove. An annular guide boss (503) is fixed on the outer side of one end of the connecting pipe (5) near the outer sleeve (2). The outer diameter of the annular guide boss (503) matches the inner diameter of the slide pipe (4). One end of the slide pipe (4) near the outer sleeve (2) is located on the outer side of the annular guide boss (503). The inner diameter of the connecting pipe (5) matches the outer diameter of the inner sleeve (7).

3. The adjustable initial length support according to claim 2, characterized in that: A compression spring (8) is provided on the outside of the connecting pipe (5), and the compression spring (8) is located between the annular guide boss (503) and the annular limiting boss (403); The connecting pipe (5) has an annular retaining ring mounting groove (505) on the outer side of the end away from the outer sleeve (2). The annular retaining ring mounting groove (505) is provided with a shaft retaining ring (11) on the inner side. The shaft retaining ring (11) limits the end face of the annular limiting boss (403) away from the outer sleeve (2).

4. The adjustable initial length support according to claim 3, characterized in that: The annular guide boss (503) has a threaded groove (502) on its side wall. A limit pin (6) is threadedly connected inside the threaded groove (502). The limit pin (6) limits the end face of the slide tube (4) near the outer sleeve (2). The slide tube (4) has a positioning groove (401) on the end face near the outer tube (2) that corresponds to the limiting pin (6). When the limiting pin (6) is located inside the positioning groove (401), the annular limiting boss (403) is located on the side of the mounting hole (504) near the outer tube (2).

5. The adjustable initial length support according to claim 1, characterized in that: The axis of the mounting hole (504) is perpendicular to the axis of the connecting pipe (5), and the axis of the mounting hole (504) intersects with the axis of the connecting pipe (5). The mounting hole (504) is a tapered hole, and the diameter of the mounting hole (504) at one end near the axis of the connecting pipe (5) is smaller than the diameter at the other end. Multiple annular grooves (701) are evenly arranged along the length of the inner sleeve (7); Multiple mounting holes (504) are evenly arranged circumferentially along the axis of the connecting pipe (5), and each mounting hole (504) is provided with a limiting ball (10); The cross-section of the annular groove (701) is an arc shape that matches the limiting ball (10), and the depth of the annular groove (701) is less than the radius of the limiting ball (10). The inner diameter of the annular limiting boss (403) matches the outer diameter of the connecting pipe (5), and the height of the annular limiting boss (403) is greater than the depth of the annular groove (701).

6. The adjustable initial length support according to claim 5, characterized in that: The outer edge of the annular limiting boss (403) away from the outer sleeve (2) has a chamfered structure.

7. The adjustable initial length support according to claim 1, characterized in that: The inner sleeve (7) has a support head (3) at the end away from the hydraulic lifting assembly (1). The support head (3) has a connecting column (302) fixed at the end near the inner sleeve (7). The diameter of the connecting column (302) matches the inner diameter of the inner sleeve (7). The connecting column (302) is installed on the inner side of the inner sleeve (7).

8. A support device with an adjustable initial length according to claim 7, characterized in that: The support head (3) has a V-groove (301) at the end away from the connecting column (302).

9. A support device with an adjustable initial length according to claim 7, characterized in that: The connecting column (302) has a threaded hole (303), and a ball plunger (9) is threaded into the threaded hole (303). The ball of the ball plunger (9) protrudes from the side wall of the connecting column (302). The inner sleeve (7) has an annular limiting groove (702) corresponding to the ball, and the ball is located inside the annular limiting groove (702).

10. A support device with an adjustable initial length according to claim 1, characterized in that: The outer side of the slide tube (4) has anti-slip texture (402).

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