Adjustable jack

Abstract

The utility model relates to jack mechanical engineering technical field, and disclose a kind of adjustable jack, including the jack body for providing jacking power, the fixed plate of horizontal fixed installation in the top of the jack body, the support plate of horizontal setting in the fixed plate directly above, the outer wall of the support plate is evenly hinged and installed with multiple unfolding plates that can be turned outwards to increase support area along circumference, the utility model is unfolded by hinged and installed with multiple unfolding plates that can be turned outwards on the outer wall of support plate, and cooperation drive column, the linkage structure of driving plate is unfolded to realize the opening and closing of unfolding plate, so that staff can adjust support area according to the size and material quality of the supported object, effectively avoid the problem of workpiece surface indentation damage caused by excessive local pressure;While the support surface after expansion makes support force evenly dispersed, improves support stability, avoids the supported object deviation and slip.

Description

Technical Field

[0001] This utility model relates to the field of mechanical engineering technology of jacks, and in particular to an adjustable jack. Background Technology

[0002] In many fields such as industrial production, machinery maintenance, construction, and vehicle rescue, jacks play an irreplaceable role as a key tool for lifting heavy objects. Currently, most adjustable jacks on the market achieve height adjustment through hydraulic transmission, screw transmission, or gear transmission to adapt to different lifting needs. The top of the jack is usually equipped with a bearing plate for contacting the supported object. This bearing plate is an important component for transmitting lifting force and meeting the support requirements of the supported object.

[0003] The core limitation of existing adjustable jacks lies in the design of a fixed-area support plate, which is particularly problematic when supporting specific types of objects. When dealing with precision equipment such as machine tools and instruments, fragile workpieces such as precast concrete components, or easily deformable materials such as thin-walled metal and wood structures, the fixed small-area support plate concentrates the supporting force at the contact point. This causes the local pressure to far exceed the tolerance threshold of the workpiece or material, which can easily lead to surface dents and damage to precision components. Furthermore, the concentrated pressure reduces the stability of the support and increases the risk of the supported object shifting or slipping. It is unable to adapt to the needs of supporting objects with different materials and structural strengths.

[0004] Therefore, an adjustable jack was designed. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing an adjustable jack. It solves the problem that existing adjustable jacks have a fixed bearing plate area, which leads to concentrated support force when supporting precision equipment, fragile workpieces, or easily deformable materials, causing local pressure to exceed the tolerance threshold and resulting in workpiece dents and component damage.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An adjustable jack includes a jack body for providing jacking force, a fixed plate horizontally fixedly installed on the top of the jack body, and a support plate horizontally arranged directly above the fixed plate. Multiple unfolding plates that can be flipped outward to increase the support area are evenly hinged along the outer wall of the support plate in the circumferential direction.

[0007] Preferably, the fixing plate has a cross-shaped symmetrical design, and a cylindrical mounting groove extending vertically is provided at the center of the fixing plate. A drive column that can slide along the axial direction of the groove and rotate circumferentially is slidably installed in the mounting groove.

[0008] Preferably, the drive column includes a rectangular block at the top and a cylinder at the bottom, the rectangular block and the cylinder are rotatably connected, the lower end face of the cylinder at the bottom of the drive column is a circular groove structure that is recessed inward, and a spring is provided between the top surface of the circular groove and the bottom of the mounting groove.

[0009] Preferably, at least one inclined groove is formed on the outer wall of the bottom cylinder of the drive column, and the inclined groove is designed in a spiral shape.

[0010] Preferably, a cylindrical limiting post is slidably installed in the inclined groove, one end of the limiting post is embedded in the inclined groove and fits against the inner wall of the inclined groove, and a drive plate is fixedly installed at the other end of the limiting post.

[0011] Preferably, a plurality of connecting columns are fixedly installed at the bottom of the support plate, and the plurality of connecting columns are fixedly connected to the top of the fixed plate.

[0012] Preferably, the outer wall of the drive plate is uniformly provided with circular grooves along the circumference, corresponding to the number of connecting posts. The circular grooves are circular through holes adapted to the outer wall of the connecting posts. Each connecting post passes through the corresponding circular groove, and a sliding gap is left between the circular groove and the connecting post.

[0013] Preferably, a rectangular groove extending vertically is provided at the center of the support plate, and the cross-sectional shape and size of the rectangular groove are adapted to the cross-section of the rectangular block at the top of the drive column.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes an outwardly rotatable unfolding plate hinged to the outer wall of a support plate, and a linkage structure between the drive column and the drive plate to achieve the opening and closing of the unfolding plate. This allows workers to adjust the support area according to the size and material of the supported object, effectively avoiding the problem of workpiece surface dent damage caused by excessive local pressure. At the same time, the enlarged support surface evenly distributes the support force, improves support stability, and prevents the supported object from shifting and slipping. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall bottom view of the present invention; Figure 3 This is a schematic diagram of the overall structure of the support plate of this utility model; Figure 4 This is a schematic diagram of the overall structure of the drive board of this utility model; Figure 5 This is an exploded structural diagram of the drive column of this utility model; Figure 6 This is a partial cross-sectional structural diagram of the present invention.

[0017] Drawing number descriptions: 1. Jack body; 2. Fixing plate; 21. Mounting groove; 3. Drive plate; 31. Circular groove; 32. Limiting post; 4. Support plate; 41. Connecting post; 42. Expanding plate; 43. Rectangular groove; 5. Drive post; 51. Inclined groove; 52. Spring. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings.

[0019] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the present invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0020] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or position based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0021] It is understood that the term "a" should be understood as "at least one" or "one or more," that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0022] Example 1: Please see Figure 1-6An adjustable jack includes a jack body 1 for providing jacking force, a fixed plate 2 horizontally fixedly installed on the top of the jack body 1, and a support plate 4 horizontally positioned directly above the fixed plate 2. Multiple outwardly hinged plates 42, which can be flipped outwards to increase the support area, are evenly hinged along the outer wall of the support plate 4. The fixed plate 2 has a cross-shaped symmetrical design, and a cylindrical mounting groove 21 extending vertically is provided at the center of the fixed plate 2. A drive column 5, which can slide along the axial direction of the groove and rotate circumferentially, is slidably installed within the mounting groove 21. The drive column 5 includes a rectangular block at the top and a cylinder at the bottom, which are rotatably connected. The lower end face of the bottom cylinder of the drive column 5 has an inwardly recessed circular groove structure, and a spring 52 is provided between the top surface of the circular groove and the bottom of the mounting groove 21. At least one inclined groove 51, which is spirally designed, is provided on the outer wall of the bottom cylinder of the drive column 5. A cylindrical limiting post 32 is slidably installed in the inclined groove 51. One end of the limiting post 32 is embedded in the inclined groove 51 and fits against the inner wall of the inclined groove 51, while the other end of the limiting post 32 is fixedly installed with a drive plate 3. Multiple connecting posts 41 are fixedly installed at the bottom of the support plate 4, and all of the multiple connecting posts 41 are fixedly connected to the top of the fixed plate 2. Circular grooves 31 corresponding to the number of connecting posts 41 are evenly opened along the circumference on the outer wall of the drive plate 3. The circular grooves 31 are circular through holes adapted to the outer wall of the connecting posts 41. Each connecting post 41 passes through the corresponding circular groove 31, and a sliding gap is left between the circular groove 31 and the connecting post 41. A rectangular groove 43 extending vertically is opened at the center of the support plate 4. The cross-sectional shape and size of the rectangular groove 43 are perfectly adapted to the cross-section of the rectangular block at the top of the drive post 5.

[0023] When the device is in its non-operational initial state, the four unfolding plates 42 are folded and fitted along the outer wall of the support plate 4. The rectangular block at the top of the drive column 5 is located above the rectangular groove 43 of the support plate 4, and the outer wall of the rectangular block is tightly fitted with the inner sidewall of the four unfolding plates 42. This makes the drive column 5, the support plate 4, and the four folded unfolding plates 42 together form an integral structure with a rectangular cross-section. The horizontal projected area of ​​this integral structure is consistent with the horizontal projected area of ​​the bottom annular drive plate 3. At this time, the spring 52 at the bottom of the drive column 5 is in a naturally extended state, supporting the drive column 5 to maintain an axially high position. The limiting column 32 is located at the initial position at the upper end of the inclined groove 51. The drive plate 3 is coaxially sliding and adapted to the connecting column 41 through the circular groove 31. Place the jack body 1 on a horizontal support surface and adjust its position. Based on the size and material of the supported object, determine the area to be expanded. If expansion is required, the operator needs to rotate the drive plate 3. When the drive plate 3 rotates, its circular groove 31 slides along the axis of the fixed connecting column 41. The connecting column 41 is fixed between the fixed plate 2 and the support plate 4, restricting the axial displacement of the drive plate 3 and allowing only circumferential rotation. At the same time, the drive plate 3 drives the limiting column 32 fixed on the inner wall to rotate synchronously in the circumferential direction. The limiting column 32 slides along a spiral trajectory in the inclined groove 51. Since the inclined groove 51 is opened on the outer wall of the drive column 5, the circumferential movement of the limiting column 32 is converted into an axial downward thrust on the drive column 5, compressing the spring 52 and causing the drive column 5 to move axially downward along the mounting groove 21 until the rectangular block at the top of the drive column 5 is completely inserted into the rectangular groove 43 of the support plate 4, and the outer wall of the rectangular block is disengaged from the inner wall of the unfolding plate 42, releasing the folding limitation on the unfolding plate 42. After the drive column 5 moves down into place, the staff flips the four unfolding plates 42 outwards respectively. The unfolding plates 42 rotate around the hinge point with the support plate 4 until the lower surface of the unfolding plate 42 rests against the top of the drive plate 3. At this time, the top surface of the support plate 4, the top surfaces of the four unfolding plates 42, and the drive column 5 are on the same horizontal plane, thereby expanding the rear support surface and dispersing local pressure; Then, the lifting mechanism of the jack body 1 is activated, and the jack body 1 outputs lifting force upward, which is transmitted to the connecting column 41 through the top fixed plate 2, and then transmitted to the support plate 4 and the unfolding plate 42 by the connecting column 41. The expanded support surface contacts the bottom surface of the supported object. Due to the increased contact area, the support force is evenly distributed compared to the initial folded state, thus achieving stable lifting. After the lifting operation is completed, first operate the jack body 1 to fall back, so that the support plate 4 and the unfolding plate 42 are separated from the supported object. Then, flip the four unfolding plates 42 inward to the folded state that fits against the outer wall of the support plate 4. Rotate the drive plate 3 in the opposite direction, so that the limiting column 32 slides upward in the opposite direction in the inclined groove 51. The spring 52 returns to its natural extension state, pushing the drive column 5 to rise axially until the rectangular block at the top of the drive column 5 is re-embedded in the rectangular groove 43 of the support plate 4, and the outer wall of the rectangular block fits against the inner wall of the unfolding plate 42, restoring the initial rectangular overall structure. In another embodiment, a protruding locking block is provided on the outer wall of the unfolding plate 42, and a matching recessed locking groove is provided on the top of the fixing plate 2, so that when the unfolding plate 42 is flipped to be coplanar with the top surface of the support plate 4, the protruding locking block on the outer wall of the unfolding plate 42 automatically embeds into the corresponding recessed locking groove on the top of the fixing plate 2, thereby realizing the unfolding and positioning of the unfolding plate 42 and effectively preventing displacement due to vibration or force during use. In another embodiment, a rectangular groove is pre-set on the inner sidewall where the unfolding plate 42 contacts the top rectangular block of the drive column 5, and a permanent magnet is fixedly embedded in the groove by high-strength structural adhesive; correspondingly, a rectangular mounting groove is opened on the outer wall of the top rectangular block of the drive column 5, which is perfectly matched in position and size to the groove of the unfolding plate 42, and a permanent magnet with opposite magnetism to the unfolding plate 42 is fixedly embedded in the groove. The surface of the magnet is galvanized or chrome-plated for rust prevention to avoid rust affecting the magnetism after long-term use. When the device is in its non-operational initial state, the four unfolding plates 42 are folded and attached along the outer wall of the support plate 4. The permanent magnets on the inner sidewall of the unfolding plate 42 are fully aligned and in contact with the permanent magnets on the outer wall of the rectangular block of the drive column 5. Through the attraction force of the opposite magnetic poles, the device prevents the plates from not unfolding on their own during transportation or initial adjustment, thus achieving auxiliary positioning in the folded state and further enhancing the anti-vibration and anti-displacement capabilities of the unfolding plates 42 in the initial state.

[0024] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. An adjustable jack, characterized in that: It includes a jack body (1) for providing jacking force, a fixed plate (2) horizontally fixed on the top of the jack body (1), and a support plate (4) horizontally arranged directly above the fixed plate (2). Multiple unfolding plates (42) that can be flipped outward to increase the support area are evenly hinged on the outer wall of the support plate (4) along the circumference.

2. The adjustable jack according to claim 1, characterized in that: The fixing plate (2) is designed in a cross-shaped symmetrical shape. A cylindrical mounting groove (21) extending in the vertical direction is provided at the center of the fixing plate (2). A drive column (5) that can slide along the axial direction of the groove and can rotate in the circumferential direction is slidably installed in the mounting groove (21).

3. An adjustable jack according to claim 2, characterized in that: The drive column (5) includes a rectangular block at the top and a cylinder at the bottom. The rectangular block and the cylinder are rotatably connected. The lower end face of the cylinder at the bottom of the drive column (5) is a circular groove structure that is recessed inward. A spring (52) is provided between the top surface of the circular groove and the bottom of the mounting groove (21).

4. An adjustable jack according to claim 3, characterized in that: At least one inclined groove (51) is provided on the outer wall of the bottom cylinder of the drive column (5), and the inclined groove (51) is designed in a spiral shape.

5. An adjustable jack according to claim 4, characterized in that: A cylindrical limiting post (32) is slidably installed in the inclined groove (51). One end of the limiting post (32) is embedded in the inclined groove (51) and fits against the inner wall of the inclined groove (51). A drive plate (3) is fixedly installed on the other end of the limiting post (32).

6. An adjustable jack according to claim 1, characterized in that: Multiple connecting columns (41) are fixedly installed at the bottom of the support plate (4), and the multiple connecting columns (41) are fixedly connected to the top of the fixing plate (2).

7. An adjustable jack according to claim 5, characterized in that: The drive plate (3) has a circular groove (31) evenly distributed along the circumference on its outer wall, corresponding to the number of connecting posts (41). The circular groove (31) is a circular through hole adapted to the outer wall of the connecting post (41). Each connecting post (41) passes through the corresponding circular groove (31), and there is a sliding gap between the circular groove (31) and the connecting post (41).

8. An adjustable jack according to claim 3, characterized in that: The support plate (4) has a rectangular groove (43) extending vertically at its center. The cross-sectional shape and size of the rectangular groove (43) are adapted to the cross-section of the rectangular block at the top of the drive column (5).

Images