Lifting device

Abstract

The invention provides a lifting device which comprises a guide rail, a base, a support and a descending adjusting assembly, the base is fixedly connected with the guide rail, the support is slidably connected with the guide rail and fixedly provided with a supporting part and a fixing handle, and the descending adjusting assembly comprises an adjusting piece, an abutting piece, a first elastic piece, a second elastic piece, a fine adjustment button and a fast descending button. The adjusting piece and the abutting piece are arranged on the guide rail in a sleeved mode at intervals, the first elastic piece is connected with the adjusting piece and the support, and the second elastic piece is connected with the abutting piece and the support. The fine adjustment button is in pivot connection with the support through a pivot piece, the fine adjustment button is provided with a first abutting portion and a second abutting portion which are located on the two opposite sides of the pivot piece respectively, and one end of the fine adjustment button extends to the position above the fixed handle to form an operation portion; the fast descending button is in sliding connection with the support, one end of the fast descending button is provided with a stop groove movably connected with the adjusting piece, and the other end of the fast descending button is located above the fixed handle to form a pressing part. The lifting device has the functions of fast descending and fine-adjustment descending, and is simple in structure and convenient to operate.

Description

Technical Field

[0001] The present invention relates to the field of hardware tools, and in particular to a lifter. Background Art

[0002] A lifter is a tool used to lift or adjust the height of an object, and is widely used in multiple scenarios such as home, construction, decoration, etc. For example, a lifter can be used to lift the height of furniture such as sofas, coffee tables, washing machines, etc., to facilitate cleaning or adjusting the position, or to adjust the height of tiles during tile pasting to ensure the flatness of the tiles and improve construction efficiency. The Chinese invention patent with the publication number CN215978529U provides a fine-tuning lifter, which is designed with two buttons when placing the lifted object downward, one for rapid descent and one for fine-tuning descent, making it more convenient and safe to use. However, when using its descent adjustment device, it requires the cooperation of a rapid adjustment piece, an upper support spring, a U-shaped gland, a fine-tuning piece, a gland spring, a support spring, a torsion spring, a fine-tuning button, and a descent button, and its structure is relatively complex. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems proposed in the above background art, and provides a lifter with a rapid descent and a fine-tuning descent function, which has a relatively simple structure and is convenient to operate.

[0004] The technical solution adopted by the present invention to solve the problems of the prior art is: A lifter, comprising a guide rail, a base, a support and a descent adjustment assembly. The base is fixedly connected to the guide rail. The support is slidably connected to the guide rail. A fixed handle and a support portion for supporting a workpiece are fixedly provided on the support. The descent adjustment assembly includes an adjustment piece, a pressing piece, a first elastic member, a second elastic member, a fine adjustment button and a quick descent button. The adjustment piece is sleeved on the guide rail. The first elastic member connects the adjustment piece and the support, so that the adjustment piece and the guide rail are in a clamping fit state. The pressing piece is sleeved on the guide rail and is located above the adjustment piece. The second elastic member connects the pressing piece and the support, so that the adjustment piece and the guide rail are in a clamping fit state. The fine adjustment button is pivotally connected to the support through a pivot member. The fine adjustment button has a first pressing portion and a second pressing portion respectively located on opposite sides of the pivot member. One end of the fine adjustment button extends outside the support and is located above the fixed handle to form an operation portion. By means of the operation portion, the fine adjustment button can be rotated, so as to drive the first pressing portion and the second pressing portion to respectively abut against the adjustment piece and the pressing piece, so that the adjustment piece and the guide rail are converted from the clamping fit state to a clearance fit state. The quick descent button is slidably connected to the support. A stop groove movably connected to the adjustment piece is provided at one end of the quick descent button. The other end of the quick descent button is located outside the support and is located above the fixed handle to form a pressing portion. When the pressing portion is pressed, the quick descent button can slide downward, and drives the adjustment piece to move through the stop groove, so that the adjustment piece and the guide rail are converted from the clamping fit state to a clearance fit state.

[0005] Further, the operation portion of the fine adjustment button is located between the guide rail and the fixed handle, and the pressing portion of the quick descent button is located between the guide rail and the operation portion.

[0006] Further, the fine adjustment button includes a first connecting portion disposed obliquely and a second connecting portion formed by gradually bending upward along a direction away from the fixed handle from the lower end of the first connecting portion. The operation portion is fixedly provided at the higher end of the first connecting portion. The second connecting portion is pivotally connected to the support through the pivot member. The connection portion between the second connecting portion and the first connecting portion constitutes the first pressing portion, and the higher end of the second connecting portion constitutes the second pressing portion.

[0007] Further, the second connecting portion includes a first section formed by gradually bending and extending upward from the lower end of the first connecting portion in a direction away from the fixed handle, and a second section formed by gradually bending and extending upward from the higher end of the first section in a direction away from the fixed handle. The second section is pivotally connected to the support through the pivot member. The connection between the first connecting portion and the first section constitutes the first pressing portion, and the higher end of the second section constitutes the second pressing portion.

[0008] Further, the fine-tuning button is provided with a through hole for activity. The fine-tuning button is movably sleeved outside the guide rail through the through hole for activity, and the quick-drop button slidably passes through the through hole for activity.

[0009] Further, when the adjusting piece and the guide rail are in a clearance fit state, the adjusting piece is perpendicular to the guide rail; when the adjusting piece and the guide rail are in a clamping fit state, the adjusting piece is in an inclined state so as to interfere and lock with the guide rail.

[0010] Further, when the abutting piece and the guide rail are in a clamping fit state, the abutting piece is in an inclined state so as to interfere and lock with the guide rail.

[0011] Further, when the adjusting piece and the abutting piece are in an inclined state, the higher end of the adjusting piece is closer to the fixed handle than the lower end of the adjusting piece; the lower end of the abutting piece is closer to the fixed handle than the higher end of the abutting piece. The first pressing portion and the second pressing portion can respectively abut against the top surface of the higher end of the adjusting piece and the bottom surface of the higher end of the abutting piece; the stop groove is movably sleeved outside the higher end of the adjusting piece.

[0012] Further, an installation cavity is formed in the support. A fixed block is fixed in the installation cavity. The fixed block is slidably sleeved on the guide rail. The adjusting piece, the abutting piece, the first elastic member and the second elastic member are accommodated in the installation cavity; one end of the first elastic member away from the adjusting piece is connected to the support through the fixed block.

[0013] Further, the lifter includes a rising adjustment assembly. The rising adjustment assembly includes a driving piece, a reset member and a movable handle. The driving piece is sleeved on the guide rail, and the driving piece and the guide rail are in a clearance fit state; the reset member connects the support and the driving piece; the movable handle is located below the fixed handle and is hinged to the support. When the movable handle rotates relative to the fixed handle, one end of the movable handle contacts the driving piece, and then drives the driving piece to move so that the driving piece and the guide rail are converted from the clearance fit state to the clamping fit state.

[0014] Further, when the driving piece and the guide rail are in a clearance fit state, the driving piece is perpendicular to the guide rail; when the driving piece and the guide rail are in a clamping fit state, the driving piece is in an inclined state so as to interfere and lock with the guide rail.

[0015] Further, the movable handle includes a handle portion and an abutting portion fixedly connected to the handle portion. One end of the abutting portion close to the handle portion is rotatably connected to the support through a mounting shaft, and when the movable handle rotates, the abutting portion can contact the top surface of the driving piece.

[0016] Further, the abutting portion includes two oppositely spaced abutting arms and an abutting shaft connecting one ends of the two abutting arms. The other ends of the two abutting arms are fixedly connected to the handle portion, and one ends of the two abutting arms close to the handle portion are rotatably connected to the support through the mounting shaft; when the movable handle rotates, the abutting shaft can contact the top surface of the driving piece.

[0017] Further, two guiding holes are spaced on the support, and two ends of the abutting shaft are respectively slidably inserted into the two guiding holes to guide the movement of the abutting shaft.

[0018] Advantages of the present invention: When the above-mentioned lifter is in use, by pressing the operating portion of the fine-tuning button of the descending adjustment assembly, the supporting portion can be moved downward little by little for fine-tuning. By continuously pressing the pressing portion of the quick-descending button, the supporting portion can be quickly descended, realizing the functions of quick descent and fine-tuning descent. Moreover, the functions of quick descent and fine-tuning descent are realized through the adjusting piece, the abutting piece, the first elastic member, the second elastic member, the fine-tuning button and the quick-descending button, and the structure is relatively simple; at the same time, the operating portion of the fine-tuning button and the pressing portion of the quick-descending button are both arranged above the fixed handle, which is convenient for the user to operate. Description of the drawings

[0019] The above-mentioned purpose, technical solution and advantages of the invention can be realized by the following drawings: Figure 1 Is a perspective view of the lifter according to a preferred embodiment of the present invention; Figure 2 Is an exploded view of the lifter according to a preferred embodiment of the present invention; Figure 3 Is Figure 2 A structural schematic diagram after removing part of the support; Figure 4 Is Figure 1 A structural schematic diagram of a partial structure after removing the support; Figure 5 Is a structural diagram of the fine-tuning button in the lifter according to a preferred embodiment of the present invention; Figure 6 is Figure 1 the top view of; Figure 7 is Figure 6 the sectional view of a partial structure along line A-A; Figure 8 is Figure 7 the enlarged view of the structure at B; Description of main component symbols 100, lifter; 10, guide rail; 30, base; 31, accommodating groove; 50, support; 51, installation cavity; 52, fixing block; 521, positioning groove; 53, fixing handle; 54, supporting part; 55, avoiding hole; 56, guiding hole; 57, through hole; 58, sliding hole; 59, guiding block; 70, ascending adjustment component; 71, driving piece; 711, socket hole; 72, resetting piece; 73, movable handle; 731, handle part; 732, abutting part; 733, abutting arm; 734, abutting shaft; 735, mounting shaft; 90, descending adjustment component; 91, adjusting piece; 911, sleeve hole; 92, abutting piece; 921, sleeved hole; 93, first elastic piece; 94, second elastic piece; 95, fine-tuning button; 951, first pressing part; 952, second pressing part; 953, operating part; 954, first connecting part; 955, second connecting part; 9551, first section; 9552, second section; 956, movable hole; 96, quick-drop button; 961, stopping groove; 962, pressing part; 963, guiding groove; 964, limiting part; 97, pivoting part. Specific embodiments

[0020] The present invention will be further described in detail below with reference to the accompanying drawings of the embodiments.

[0021] Please refer to Figures 1 to 3 , a lifter 100 provided by a preferred embodiment of the present invention includes a guide rail 10, a base 30, a support 50, an ascending adjustment component 70 and a descending adjustment component 90. The base 30 is fixedly connected to the guide rail 10. The support 50 is slidably connected to the guide rail 10. A supporting part 54 for supporting the workpiece to be lifted is fixedly provided on the support 50. The ascending adjustment component 70 connects the support 50 and the guide rail 10 and is used to drive the supporting part 54 to move upward along the guide rail 10. The descending adjustment component 90 is arranged above the ascending adjustment component 70. The descending adjustment component 90 connects the support 50 and the guide rail 10 and is used to drive the supporting part 54 to move downward along the guide rail 10.

[0022] In this embodiment, the guide rail 10 is generally in the shape of a square rod vertically arranged. The base 30 is generally in the shape of a plate, and the base 30 is fixedly connected to the bottom end of the guide rail 10. At least one receiving groove 31 is provided on the base 30. An installation cavity 51 is formed in the support 50, a fixing block 52 is fixed in the installation cavity 51, the guide rail 10 slidably passes through the installation cavity 51, and the fixing block 52 is slidably sleeved on the guide rail 10. A fixing handle 53 is fixedly provided on the support 50. At least one supporting portion 54 is fixedly connected to the bottom of the support 50. In this embodiment, the supporting portion 54 is generally in the shape of a plate, one end of the supporting portion 54 is fixedly connected to the support 50, and the other end of the supporting portion 54 extends in a direction away from the fixing handle 53.

[0023] The rising adjustment assembly 70 includes a driving piece 71, a reset member 72 and a movable handle 73. The driving piece 71 is sleeved on the guide rail 10, and the driving piece 71 and the guide rail 10 are in a clearance fit state. In this embodiment, the driving piece 71 is received in the installation cavity 51 and is located below the fixing block 52. Please refer to Figure 4 , Figure 6 and Figure 7 , a socket hole 711 is provided on the driving piece 71. The socket hole 711 is a rectangular hole matching the cross-section of the guide rail 10, and the size is slightly larger than the cross-section of the guide rail 10. The driving piece 71 is sleeved on the guide rail 10 through the socket hole 711. When the driving piece 71 and the guide rail 10 are in a clearance fit state, the driving piece 71 is perpendicular to the guide rail 10. At this time, the driving piece 71 can move freely along the guide rail 10 under the action of an external force. The two ends of the reset member 72 are respectively connected to the support 50 and the driving piece 71; in this embodiment, the reset member 72 is received in the installation cavity 51 and is located below the fixing block 52. The reset member 72 can be a spring. The reset member 72 is sleeved on the guide rail 10, and one end is connected to the support 50 and the other end is connected to the side of the driving piece 71 facing away from the fixing block 52.

[0024] The movable handle 73 is located below the fixing handle 53 and is hinged to the support 50. When the movable handle 73 rotates relative to the fixing handle 53, one end of the movable handle 73 contacts the driving piece 71 to drive the driving piece 71 to move, so that the driving piece 71 and the guide rail 10 are converted from a clearance fit state to a clamping fit state. In this embodiment, when the driving piece 71 and the guide rail 10 are in a clamping fit state, the driving piece 71 is in an inclined state to interfere and lock with the guide rail 10, so that the driving piece 71 cannot move freely relative to the guide rail 10, and further the driving piece 71 and the guide rail 10 are in a clamping fit.

[0025] In this embodiment, the movable handle 73 includes a handle portion 731 and an abutting portion 732 fixedly connected to the handle portion 731. One end of the abutting portion 732 close to the handle portion 731 is rotatably connected to the support 50 through a mounting shaft 735. Specifically, the abutting portion 732 includes two oppositely spaced abutting arms 733 and an abutting shaft 734 connecting one ends of the two abutting arms 733. The ends of the two abutting arms 733 remote from the abutting shaft 734 are fixedly connected to the handle portion 731. One ends of the two abutting arms 733 close to the handle portion 731 are rotatably connected to the support 50 through the mounting shaft 735, and the ends of the two abutting arms 733 provided with the abutting shaft 734 movably extend into the mounting cavity 51. In this embodiment, the support 50 is further provided with an avoidance hole 55 ( Figure 1 ), and the abutting arms 733 of the movable handle 73 pass through the avoidance hole 55 to be inserted into the mounting cavity 51. The mounting shaft 735 passes through one ends of the two abutting arms 733 close to the handle portion 731, and both ends of the mounting shaft 735 are fixed to the support 50, thereby rotatably connecting the movable handle 73 to the support 50. When the movable handle 73 rotates, the abutting shaft 734 of the abutting portion 732 can be in contact with the top surface of the driving piece 71, so as to drive the driving piece 71 to change from a state perpendicular to the guide rail 10 to a state inclined relative to the guide rail 10, so that the driving piece 71 is in a clamping fit with the guide rail 10. In this embodiment, the support 50 is further provided with two guiding holes 56 at intervals, and both ends of the abutting shaft 734 are respectively slidably inserted into the two guiding holes 56 to guide the movement of the abutting shaft 734. In addition, a positioning groove 521 ( Figure 7 ) is recessed on the side surface of the fixed block 52 facing the abutting shaft 734. In the initial state, the abutting shaft 734 is clamped in the positioning groove 521 and is out of contact with the driving piece 71.

[0026] The downward adjustment assembly 90 includes an adjusting piece 91, a pressing piece 92, a first elastic member 93, a second elastic member 94, a fine-tuning button 95 and a quick-drop button 96. The adjusting piece 91 is sleeved on the guide rail 10, and the first elastic member 93 connects the adjusting piece 91 and the support 50 so that the adjusting piece 91 and the guide rail 10 are in a clamping fit state. In this embodiment, the adjusting piece 91 is received in the installation cavity 51 and is located above the fixed block 52. The adjusting piece 91 is provided with a sleeving hole 911, and the sleeving hole 911 is a rectangular hole matching the cross-section of the guide rail 10, with a size slightly larger than the cross-section of the guide rail 10. The adjusting piece 91 is sleeved on the guide rail 10 through the sleeving hole 911. The first elastic member 93 can be a spring. The first elastic member 93 is received in the installation cavity 51 and sleeved on the guide rail 10. The first elastic member 93 is located on the side of the adjusting piece 91 facing the fixed block 52, and one end of the first elastic member 93 is connected to the adjusting piece 91, and the end of the first elastic member 93 far from the adjusting piece 91 is connected to the support 50 through the fixed block 52. In the initial state, the first elastic member 93 makes the adjusting piece 91 in an inclined state to interfere and lock with the guide rail 10, so that the adjusting piece 91 and the guide rail 10 are in a clamping fit; and when the adjusting piece 91 is in an inclined state, the higher end of the adjusting piece 91 is closer to the fixed handle 53 than the lower end of the adjusting piece 91.

[0027] The pressing piece 92 is sleeved on the guide rail 10 and is located above the adjusting piece 91. The second elastic member 94 connects the pressing piece 92 and the support 50 so that the adjusting piece 91 and the guide rail 10 are in a clamping fit state. In this embodiment, the pressing piece 92 is received in the installation cavity 51. The pressing piece 92 is provided with a sleeving hole 921, and the sleeving hole 921 is a rectangular hole matching the cross-section of the guide rail 10, with a size slightly larger than the cross-section of the guide rail 10. The pressing piece 92 is sleeved on the guide rail 10 through the sleeving hole 921. The second elastic member 94 can be a spring. The second elastic member 94 is received in the installation cavity 51 and sleeved on the guide rail 10. The second elastic member 94 is located on the side of the pressing piece 92 facing away from the fixed block 52. In the initial state, the second elastic member 94 makes the adjusting piece 91 in an inclined state to interfere and lock with the guide rail 10, so that the adjusting piece 91 and the guide rail 10 are in a clamping fit; and when the pressing piece 92 is in an inclined state, the lower end of the pressing piece 92 is closer to the fixed handle 53 than the higher end of the pressing piece 92.

[0028] The fine-tuning button 95 is pivotally connected to the support 50 through a pivot member 97. The fine-tuning button 95 has a first pressing portion 951 and a second pressing portion 952 respectively located on opposite sides of the pivot member 97. The first pressing portion 951 and the second pressing portion 952 can respectively contact the top surface of the higher end of the adjusting piece 91 and the bottom surface of the higher end of the pressing piece 92. One end of the fine-tuning button 95 extends outside the support 50 and is located above the fixed handle 53 to form an operating portion 953.

[0029] Please refer toFigure 5 and Figure 8 , in this embodiment, the fine-tuning button 95 includes a first connecting portion 954 arranged obliquely and a second connecting portion 955 formed by gradually bending and extending upward from the lower end of the first connecting portion 954 in a direction away from the fixed handle 53. In this embodiment, the first connecting portion 954 movably penetrates through the support 50 so that the lower end of the first connecting portion 954 is located in the installation cavity 51. Specifically, a through hole 57 is provided on the support 50, and the first connecting portion 954 movably penetrates through the through hole 57 so that the lower end of the first connecting portion 954 is located in the installation cavity 51. The second connecting portion 955 is received in the installation cavity 51, and the second connecting portion 955 is pivotally connected to the support 50 through a pivot member 97. The connection portion between the second connecting portion 955 and the first connecting portion 954 constitutes a first pressing portion 951, and the upper end of the second connecting portion 955 constitutes a second pressing portion 952. Specifically, the second connecting portion 955 includes a first section 9551 formed by gradually bending and extending upward from the lower end of the first connecting portion 954 in a direction away from the fixed handle 53 and a second section 9552 formed by gradually bending and extending upward from the upper end of the first section 9551 in a direction away from the fixed handle 53. The second section 9552 is pivotally connected to the support 50 through a pivot member 97. The connection portion between the first connecting portion 954 and the first section 9551 constitutes a first pressing portion 951, and the upper end of the second section 9552 constitutes a second pressing portion 952. In this embodiment, the upper end of the second section 9552 forms a second pressing portion 952 with a hook-shaped structure opening downward. The operating portion 953 is used for an operator to press the first connecting portion 954 to rotate the fine-tuning button 95. The operating portion 953 of the fine-tuning button 95 is located between the guide rail 10 and the fixed handle 53. The pivot member 97 can be a structure such as a rotating shaft.

[0030] In this embodiment, the fine-tuning button 95 is also provided with a through hole 956, and the through hole 956 extends from the first connecting portion 954 to the second section 9552 of the second connecting portion 955, so that the fine-tuning button 95 is movably sleeved outside the guide rail 10 through the through hole 956.

[0031] The quick-drop button 96 is slidably connected to the support 50 and is located at one end of the abutting piece 92 close to the fixed handle 53. A stop groove 961 is provided at one end of the quick-drop button 96 and is movably connected to the upper end of the adjusting piece 91. The other end of the quick-drop button 96 is located outside the support 50 and above the fixed handle 53 to form a pressing portion 962. In this embodiment, the quick-drop button 96 is generally rod-shaped, and the quick-drop button 96 is slidably connected to the support 50. Specifically, a sliding hole 58 is opened at the top of the support 50, and the quick-drop button 96 slidably penetrates through the sliding hole 58 and the through hole 956. The stop groove 961 is opened at one end of the quick-drop button 96 located in the installation cavity 51. In this embodiment, a guide groove 963 is also recessed at one end of the quick-drop button 96 located in the installation cavity 51 (Figure 4 ), a guiding groove 963 is provided on the side of the quick descent button 96 facing away from the stop groove 961; a guiding block 59 protrudes from the inner wall of the installation cavity 51, and the quick descent button 96 is slidably connected to the guiding block 59 through the stop groove 961 to guide the sliding of the quick descent button 96. The pressing portion 962 of the quick descent button 96 is located between the guide rail 10 and the operating portion 953 and is used for the user to press to make the quick descent button 96 move downward. In this embodiment, the pressing portion 962 is generally plate-shaped and can abut against the outer wall of the support 50 to limit the position of the quick descent button 96 moving downward. In addition, a limiting portion 964 located below the fine adjustment button 95 protrudes from one end of the quick descent button 96 located in the installation cavity 51. During the upward movement of the quick descent button 96, the limiting portion 964 can abut against the bottom surface of the first connecting portion 954 of the fine adjustment button 95 to limit the position of the quick descent button 96 moving upward.

[0032] In the initial state, the support portion 54 is received in the accommodation groove 31 of the base 30 to be closed with the base 30. When in use, the support portion 54 and the base 30 are extended to the bottom of the item to be lifted, and then the fixed handle 53 and the movable handle 73 are held by hand and the movable handle 73 is continuously squeezed so that the movable handle 73 rotates relative to the support 50. When the movable handle 73 rotates, the driving piece 71 is pressed by the abutting shaft 734 at one end of the movable handle 73, so that the driving piece 71 is in an inclined state and interferes with and locks the guide rail 10. Then, when the movable handle 73 is continuously pressed, the movable handle 73 will receive an upward reaction force from the driving piece 71, thereby driving the support 50 and the support portion 54 thereon to move upward. When the abutting shaft 734 at one end of the movable handle 73 presses the driving piece 71, the reset member 72 is compressed. When the movable handle 73 is released, the elastic restoring force of the reset member 72 causes the driving piece 71 to return to a state perpendicular to the guide rail 10, so as to have a clearance fit with the guide rail 10, so that the driving piece 71 moves upward under the action of the elastic restoring force of the reset member 72. By repeatedly pressing the movable handle 73, the item can be lifted upward through the support portion 54, so that the item is lifted to the required height.

[0033] When it is necessary to lower an object, the pressing portion 962 or the operating portion 953 can be pressed as needed. Pressing the operating portion 953 can cause the fine-tuning button 95 to rotate, so that the first pressing portion 951 and the second pressing portion 952 respectively press against the top surface of the higher end of the adjusting piece 91 and the bottom surface of the higher end of the abutting piece 92, thereby driving the adjusting piece 91 to move, so that the adjusting piece 91 is changed from the inclined clamping fit state with the guide rail 10 to the clearance fit state perpendicular to the guide rail 10, so that the adjusting piece 91 can move relative to the guide rail 10. During this process, the first elastic member 93 is compressed. The second pressing portion 952 presses against the bottom surface of the higher end of the abutting piece 92. Since the abutting piece 92 and the guide rail 10 are in an inclined interference clamping state, therefore, the second pressing portion 952 of the fine-tuning button 95 receives a downward reaction force from the abutting piece 92, and then drives the support 50 and the supporting portion 54 thereon to move downward, and drives the quick-drop button 96 to move downward together with the support 50 through the cooperation between the adjusting piece 91 and the positioning groove 961. During this process, the second elastic member 94 is compressed. Since the vertical distance between the adjusting piece 91 and the fixed block 52 is limited, the support 50 and the supporting portion 54 thereon can only move in a single step, realizing the downward fine-tuning of the object. After releasing the pressing portion 962, under the action of the elastic restoring force of the first elastic member 93, the adjusting piece 91 is restored to the inclined clamping fit state with the guide rail 10, and then the support 50 stays at this lowered position. Under the action of the elastic restoring force of the second elastic member 93, the abutting piece 92 moves downward. By repeatedly pressing the pressing portion 962 of the fine-tuning button 95, the lowered position of the object can be fine-tuned to the required height through the lifting piece.

[0034] When it is necessary to quickly lower an object, the pressing portion 962 can be pressed to make the quick-drop button 96 move downward, and then drive the adjusting piece 91 to move through the positioning groove 961 and compress the first elastic member 93, so that the adjusting piece 91 is changed from the clamping fit state with the guide rail 10 to the clearance fit state perpendicular to the guide rail 10. By continuously pressing the operating portion 953, the adjusting piece 91 can be kept in the clearance fit state all the time, so that the support 50 and the supporting portion 54 can be quickly lowered along the guide rail 10 by pulling down the fixed handle 53. After releasing the pressing portion 962, under the action of the elastic restoring force of the first elastic member 93, the adjusting piece 91 and the quick-drop button 96 can be reset.

[0035] The above-mentioned lifter 100 can move the support part 54 downward little by little for fine adjustment by pressing the operation part 953 of the fine adjustment button 95 of the lowering adjustment component 90. Continuously pressing the pressing part 962 of the quick lowering button 96 can make the support part 54 quickly descend, realizing the functions of quick descent and fine adjustment descent. Moreover, its functions of quick descent and fine adjustment descent are realized through the adjusting piece 91, the abutting piece 92, the first elastic piece 93, the second elastic piece 94, the fine adjustment button 95 and the quick lowering button 96, and the structure is relatively simple. At the same time, the operation part 953 of the fine adjustment button 95 and the pressing part 962 of the quick lowering button 96 are both arranged above the fixed handle 53, which is convenient for the user to operate.

[0036] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0037] The above-described embodiments only represent the implementation manners of the present invention, and the description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A lifter, comprising a guide rail, a base, a support and a descending adjustment assembly, wherein the base is fixedly connected to the guide rail, the support is slidably connected to the guide rail, and a fixed handle and a support portion for supporting a workpiece are fixedly provided on the support, characterized in that: The descent adjustment assembly includes an adjustment sheet, a top sheet, a first elastic member, a second elastic member, a fine-tuning button and a quick-descent button, the adjustment sheet is sleeved on the guide rail, the first elastic member connects the adjustment sheet and the support, so that the adjustment sheet and the guide rail are in a clamping fit state; the top sheet is sleeved on the guide rail and is located above the adjustment sheet, the second elastic member connects the top sheet and the support, so that the adjustment sheet and the guide rail are in a clamping fit state; the fine-tuning button is pivotally connected to the support through a pivot member, the fine-tuning button has a first pressing portion and a second pressing portion respectively located on opposite sides of the pivot member, one end of the fine-tuning button extends outside the support and is located at the fixed handle An operating portion is formed above the handle, and the fine-adjustment button can be rotated by the operating portion, thereby driving the first pressing portion and the second pressing portion to respectively abut against the adjusting piece and the top piece, so that the adjusting piece and the guide rail are converted from the tight fit state to the clearance fit state; the quick-drop button is slidably connected to the support, and one end of the quick-drop button is provided with a stop groove movably connected to the adjusting piece, and the other end of the quick-drop button is located outside the support and above the fixed handle to form a pressing portion, and when the pressing portion is pressed, the quick-drop button can slide downward and drive the adjusting piece to move through the stop groove, so that the adjusting piece and the guide rail are converted from the tight fit state to the clearance fit state.

2. The lifter according to claim 1, characterized in that: The operating portion of the fine-adjustment button is located between the guide rail and the fixed handle, and the pressing portion of the quick-drop button is located between the guide rail and the operating portion.

3. The lifter according to claim 1, characterized in that: The fine-tuning button includes a first connecting portion that is inclined and a second connecting portion that is gradually bent upward and extends from the lower end of the first connecting portion in a direction away from the fixed handle. The operating portion is fixed to the higher end of the first connecting portion. The second connecting portion is pivotally connected to the support through the pivot member. The connection between the second connecting portion and the first connecting portion constitutes the first pressing portion, and the higher end of the second connecting portion constitutes the second pressing portion.

4. The lifter according to claim 3, characterized in that: The second connecting portion includes a first segment formed by gradually bending upward and extending from the lower end of the first connecting portion in a direction away from the fixed handle, and a second segment formed by gradually bending upward and extending from the higher end of the first segment in a direction away from the fixed handle. The second segment is pivotally connected to the support through the pivot member, the connection between the first connecting portion and the first segment constitutes the first pressing portion, and the higher end of the second segment constitutes the second pressing portion.

5. The lifter according to claim 1, characterized in that: The fine-tuning button is provided with an active hole, the fine-tuning button is movably sleeved outside the guide rail through the active hole, and the quick-drop button is slidably passed through the active hole.

6. The elevator according to claim 1, characterized in that: When the adjusting piece and the guide rail are in a clearance fit state, the adjusting piece is perpendicular to the guide rail; when the adjusting piece and the guide rail are in a clamping fit state, the adjusting piece is in an inclined state, thereby interfering and locking with the guide rail.

7. The elevator according to claim 6, characterized in that: When the abutting piece is in a clamping fit state with the guide rail, the abutting piece is in an inclined state, thereby interfering and locking with the guide rail.

8. The elevator according to claim 7, characterized in that: When the adjusting piece and the resisting piece are in an inclined state, the higher end of the adjusting piece is closer to the fixed handle than the lower end of the adjusting piece; the lower end of the resisting piece is closer to the fixed handle than the higher end of the resisting piece, and the first pressing portion and the second pressing portion can respectively resist the top surface of the higher end of the adjusting piece and the bottom surface of the higher end of the resisting piece; the stop groove is movably sleeved outside the higher end of the adjusting piece.

9. The elevator according to claim 1, characterized in that: An installation cavity is formed in the support, and a fixed block is fixed in the installation cavity. The fixed block is slidably mounted on the guide rail, and the adjustment plate, the top plate, the first elastic member and the second elastic member are accommodated in the installation cavity; one end of the first elastic member away from the adjustment plate is connected to the support through the fixed block.

10. The elevator according to claim 1, characterized in that: The lifter includes a rise adjustment component, which includes a drive plate, a reset member and a movable handle. The drive plate is sleeved on the guide rail, and the drive plate and the guide rail are in a clearance fit state; the reset member connects the support and the drive plate; the movable handle is located below the fixed handle and is hinged to the support. When the movable handle rotates relative to the fixed handle, one end of the movable handle contacts the drive plate, thereby driving the drive plate to move, so that the drive plate and the guide rail are converted from the clearance fit state to the clamping fit state.

11. The elevator according to claim 10, characterized in that: When the drive plate and the guide rail are in a clearance fit state, the drive plate is perpendicular to the guide rail; when the drive plate and the guide rail are in a clamping fit state, the drive plate is in an inclined state, thereby interfering and locking with the guide rail.

12. The elevator according to claim 10, characterized in that: The movable handle includes a handle portion and an abutment portion fixedly connected to the handle portion. One end of the abutment portion close to the handle portion is rotatably connected to the support via a mounting shaft. When the movable handle rotates, the abutment portion can contact the top surface of the drive sheet.

13. The elevator according to claim 12, characterized in that: The abutment portion includes two abutment arms arranged relatively spaced apart and an abutment shaft connecting one end of the two abutment arms, the other end of the two abutment arms is fixedly connected to the handle portion, and one end of the two abutment arms close to the handle portion is rotatably connected to the support through the mounting shaft; when the movable handle rotates, the abutment shaft can contact the top surface of the driving plate.

14. The elevator according to claim 13, characterized in that: The support is provided with two guide holes at intervals, and the two ends of the abutment shaft are respectively inserted into the two guide holes in a sliding manner to guide the movement of the abutment shaft.

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