Nail puller

Abstract

The utility model relates to the technical field of medical instruments for orthopedics, and discloses a nail puller, which comprises an outer cylinder comprising an outer cylinder main body and a fixed handle arranged at the tail end of the outer cylinder main body, and an outer ring convex rib protruding inwards is arranged inside the front end of the outer cylinder main body; the inner barrel is sleeved with the outer barrel, the inner barrel comprises an inner barrel end and an inner barrel tail, a plurality of pressing pieces which are circumferentially arranged are arranged on the inner barrel end, inner ring convex ribs which protrude outwards are arranged on the outer sides of the pressing pieces, ejection pieces used for clamping nails are arranged on the inner sides of the pressing pieces, a straight notch is formed in the inner barrel tail, and strip-shaped teeth are arranged on one of the upper side and the lower side of the straight notch; the rotating mechanism comprises a cylindrical gear which is arranged in the straight notch and meshed with the strip-shaped teeth, the cylindrical gear is installed on a rotating shaft column, and the two ends of the rotating shaft column penetrate through the outer cylinder shell to be connected to a rotating handle. The nail puller has the advantages of simplicity in operation, integration of clamping and pulling and size self-adaption.

Description

Technical Field

[0001] The utility model relates to the technical field of orthopedic medical instruments, in particular to a nail puller. Background Art

[0002] Various screws or guide pins are usually used in orthopedic surgery to temporarily fix surgical instruments to bones. Some screws or guide pins without threads and caps can be quickly implanted into bones by hammering with a bone hammer, which is convenient and quick to use. However, due to the hardness of the cortical bone, it is difficult to remove the implanted screws or guide pins from the bones. In order to safely and efficiently remove the screws or guide pins from the bones, it is necessary to develop a nail puller tool with a simple structure, convenient use and high efficiency.

[0003] Patent application number CN202311427244.3 discloses a self-locking orthopedic nail puller. Based on the existing technology, the self-locking orthopedic nail puller simplifies the structure of the nail puller, improves the processability, and reduces the cost by improving the product structure and screw locking principle. On the other hand, the nail puller can amplify the clamping force provided by the hand through the lever principle, and rely on the friction self-locking principle to use all the amplified clamping force to pull the screw, so that the nail pulling function can be achieved with a smaller hand clamping force, thereby improving the nail pulling efficiency.

[0004] By analyzing the existing technology, it is found that the existing technology has the following disadvantages: the two operations of clamping and pulling out the nail are performed separately, and the nail puller needs to be clamped first and then pulled to pull out the nail. The force and direction are difficult to control when pulling out manually, which affects the nail pulling effect; it is unable to adapt to screws or guide pins of various sizes and specifications; the nail pulling operation is complicated. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the utility model provides a nail puller having the advantages of simple operation, integrated clamping and pulling, and adaptive size, which solves the problems of poor control of force direction and complicated nail pulling operation during manual nail pulling.

[0007] (II) Technical solution

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] A nail puller, comprising:

[0010] The outer cylinder comprises an outer cylinder body and a fixed handle arranged at the rear end of the outer cylinder body, and the outer cylinder body is provided with an outer ring rib protruding inwardly at the front end thereof;

[0011] The inner cylinder is sleeved inside the outer cylinder, the inner cylinder comprises an inner cylinder end portion and an inner cylinder tail portion respectively clamped at the front end and the tail end of the outer cylinder, a plurality of circumferentially arranged pressing sheets are arranged on the inner cylinder end portion, a gap is arranged between two adjacent pressing sheets, an inner ring convex rib protruding outward is arranged at a position close to the outer cylinder on the outer side of the pressing sheet, a top sheet for clamping nails is arranged on the inner side of the pressing sheet, a straight notch is arranged in the inner tail portion of the inner cylinder, and a strip tooth is arranged on one of the upper and lower sides of the straight notch;

[0012] The rotating mechanism comprises a cylindrical gear arranged in a straight slot and meshing with a bar tooth. The cylindrical gear is mounted on a rotating shaft column. Both ends of the rotating shaft column pass through an outer cylinder shell and are connected to a rotating handle.

[0013] Preferably, the front end position of the outer cylinder body is divided into a plurality of upper tops with gaps, and an independent outer ring rib is provided at the bottom of each upper top. An adjustment ring is also provided on the outer cylinder body, and the adjustment ring is connected to the outer side of the outer cylinder body through a thread. The position of the adjustment ring on the outer cylinder body is changed by rotating the adjustment ring, thereby changing the outward elastic force of the upper top.

[0014] Preferably, each outer ring rib is provided with an inclined outer ring slope at a position close to the front end of the outer cylinder, and each inner ring rib is provided with an inner ring slope on a side close to the outer ring slope, wherein the angle between the outer ring slope and the moving direction of the inner cylinder is greater than or equal to the angle between the inner ring slope and the moving direction of the inner cylinder.

[0015] Preferably, the number of pressing sheets on the end of the inner cylinder is an even number greater than or equal to 4, the top sheets on every two symmetrical pressing sheets are in the same position, and the top sheets on the two asymmetric pressing sheets are located at different positions on the end of the inner cylinder.

[0016] Preferably, a buffer pad is provided at the head end of the outer cylinder body, and the buffer pad is made of soft rubber material.

[0017] Preferably, in an upper top portion, a plurality of rotation grooves arranged along the moving direction of the inner cylinder are provided at the bottom of the outer ring rib.

[0018] Preferably, the two ends of the rotating shaft column are connected to the two sides of the rotating handle through gear transmission.

[0019] Preferably, a return spring is arranged at both ends of the cylindrical gear on the rotating shaft column, one end of the return spring is fixedly connected to the end of the cylindrical gear, and the other end of the return spring is fixedly connected to the inner wall of the outer cylinder shell.

[0020] Preferably, the outer cylinder body is penetrated front to back in the moving direction of the inner cylinder, and the inner cylinder tail on the inner cylinder passes through the tail end of the outer cylinder body when moving.

[0021] Preferably, the outer tube body is provided with an opening at the front end corresponding to the inner tube end, and the outer tube body is also provided with a shell wrapping the inner tube tail at the tail end corresponding to the inner tube tail, and the inner tube is always located inside the outer tube body when moving.

[0022] (III) Beneficial effects

[0023] Compared with the prior art, the utility model provides a nail puller, which has the following beneficial effects:

[0024] 1. The nail puller is provided with an inner cylinder inside an outer cylinder, a pressing sheet and a straight notch are respectively provided at both ends of the inner cylinder, a bar-shaped tooth meshing with a cylindrical gear is provided in the straight notch, an inner ring convex rib protruding outward and an outer ring convex rib protruding inward are respectively provided on the pressing sheet and the inner side of the outer cylinder, and the cylindrical gear is driven to rotate when the handle is turned, so that the inner cylinder moves inward, and at the same time, the inner ring convex rib presses on the outer ring convex rib, so that the pressing sheet is bent inward, so that the top sheet is clamped on the nail, and at this time, the handle is continued to be turned to drive the nail to be pulled out, so as to realize the integrated clamping and pulling of the nail, and the operation is simple, and since the moving direction of the inner cylinder is fixed, the nail can be pulled out more stably.

[0025] 2. The nail puller is provided with an adjustment ring on the outer side of the outer tube body. By changing the position of the adjustment ring on the upper top, the outward bending amplitude of the upper top can be changed, thereby changing the inward pressure of the upper top received by the pressing plate, thereby achieving the purpose of clamping nails of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of the nail puller of the utility model when not in use.

[0027] Figure 2 The utility model is a structural schematic diagram of the nail puller after the handle is pressed and rotated.

[0028] Figure 3 This is a cross-sectional view of the nail puller of the utility model when not in use.

[0029] Figure 4 This is a cross-sectional view of the nail puller of the utility model after the handle is pressed and rotated.

[0030] Figure 5 For this utility model Figure 3 A partial enlarged view of the area in the middle A.

[0031] Figure 6 It is a schematic structural diagram of the outer cylinder of the nail puller of the utility model.

[0032] Figure 7 The utility model is a schematic diagram of the structure of the inner cylinder of the nail puller.

[0033] Figure 8The utility model is a schematic diagram of the structure of the rotating mechanism of the nail puller.

[0034] Fig. 9 This is a schematic diagram of the structure of the nail puller of the utility model after the outer cylinder is removed.

[0035] In the figure: 1. outer cylinder; 2. inner cylinder; 3. rotating mechanism; 11. outer cylinder body; 12. fixed handle; 13. adjusting ring; 111. upper top; 112. outer ring rib; 113. buffer pad; 114. rotating groove; 115. outer ring slope; 116. rotating hole; 21. inner cylinder end; 22. inner cylinder tail; 211. pressing piece; 212. inner ring rib; 213. top piece; 214. inner ring slope; 221. straight notch; 222. strip teeth; 31. rotating handle; 32. cylindrical gear; 33. rotating shaft column; 34. return spring; 4. nail. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] Embodiment 1:

[0040] This embodiment provides a nail puller having the following technical features.

[0041] See also Figure 1-9 , a nail puller, comprising:

[0042] The outer cylinder 1 comprises an outer cylinder body 11 and a fixed handle 12 arranged at the rear end of the outer cylinder body 11. The outer cylinder body 11 is provided with an outer ring rib 112 protruding inwardly at the front end thereof.

[0043] The inner cylinder 2 is sleeved inside the outer cylinder 1. The inner cylinder 2 includes an inner cylinder end 21 and an inner cylinder tail 22 respectively clamped at the front end and the tail end of the outer cylinder 1. A plurality of circumferentially arranged pressing sheets 211 are provided on the inner cylinder end 21. A gap is provided between two adjacent pressing sheets 211. An outwardly protruding inner ring rib 212 is provided at a position near the outer cylinder 1 on the outer side of the pressing sheet 211. A top sheet 213 for clamping the nail 4 is provided on the inner side of the pressing sheet 211. A straight notch 221 is provided in the inner cylinder tail 22. A strip tooth 222 is provided on one of the upper and lower sides of the straight notch 221.

[0044] The rotating mechanism 3 includes a cylindrical gear 32 arranged in the straight slot 221 and meshing with the bar teeth 222. The cylindrical gear 32 is installed on the rotating shaft column 33. Both ends of the rotating shaft column 33 pass through the rotating hole 116 on the outer shell of the outer cylinder 1 and are connected to the rotating handle 31.

[0045] Specifically, the nail 4 is a screw or guide pin without threads and a nail cap used in orthopedic surgery, and the nail 4 is fixed in the bone during the surgery.

[0046] In an optional embodiment, if Figure 1-4 and Figure 6 As shown, the front end of the outer cylinder body 11 is divided into a plurality of upper tops 111 with gaps, and an independent outer ring rib 112 is provided at the bottom of each upper top 111. An adjustment ring 13 is also provided on the outer cylinder body 11, and the adjustment ring 13 is connected to the outer side of the outer cylinder body 11 through threads. By rotating the adjustment ring 13, the position of the adjustment ring 13 on the outer cylinder body 11 is changed, thereby changing the outward elastic force of the upper top 111.

[0047] It should be noted that when the adjusting ring 13 is located near the rear end of the outer tube body 11, Figure 1 and 3 As shown in FIG. 1 , when the inner tube 2 is pulled inward, the pressing piece 211 is pushed inward by the outer ring rib 112. Since the adjusting ring 13 is located near the rear end of the outer tube body 11, the upper top 111 is greatly bent when subjected to outward pressure, so that the top piece 213 can clamp the nail 4 with a larger size. When the adjusting ring 13 is located near the front end of the outer tube body 11, as shown in FIG. Figure 2 and 4As shown, when the inner tube 2 is pulled inward, the pressing piece 211 is pushed inward by the action of the outer ring rib 112. Since the adjustment ring 13 is located near the front end of the outer tube body 11, the adjustment ring 13 limits the outward bending arc of the upper top 111. Therefore, when the upper top 111 is subjected to outward pressure, the bending amplitude is small, so that the top piece 213 can clamp the nail 4 of smaller size.

[0048] Through the above technical solution, by adjusting the position of the adjusting ring 13 on the outer tube body 11, the top plate 213 can clamp nails 4 of different sizes.

[0049] In an optional embodiment, if Figure 5 As shown, each outer ring rib 112 is provided with an inclined outer ring slope 115 at a position close to the front end of the outer tube 1, and each inner ring rib 212 is provided with an inner ring slope 214 at a side close to the outer ring slope 115, wherein the angle between the outer ring slope 115 and the moving direction of the inner tube 2 is greater than or equal to the angle between the inner ring slope 214 and the moving direction of the inner tube 2.

[0050] It should be noted that an oblique groove is provided on the inner side of the pressing sheet 211 near the inner ring rib 212 , and the oblique groove can improve the ductility of the pressing sheet 211 when bending inward.

[0051] Through the above technical solution, by setting the inner ring slope 214 and the outer ring slope 115 that cooperate with each other, when the inner tube 2 is pulled inward, the inner ring slope 214 presses on the outer ring slope 115, and under the action of the outer ring slope 115, the pressing plate 211 bends inward, so that the top plate 213 clamps the nail 4.

[0052] In an optional embodiment, if Figure 7 As shown, the number of pressing plates 211 on the inner tube end 21 is an even number greater than or equal to 4, the positions of the top plates 213 on every two symmetrical pressing plates 211 are the same, and the top plates 213 on the two asymmetric pressing plates 211 are located at different positions on the inner tube end 21.

[0053] Specifically, Figure 7 As shown, there are four pressing plates 211, of which the upper and lower pressing plates 211 and the left and right pressing plates 211 are symmetrical to each other, the top plates 213 on the upper and lower pressing plates 211 are located at the same position near the end of the inner tube end 21, and the top plates 213 on the left and right pressing plates 211 are located at the same position near the middle of the inner tube end 21.

[0054] Through the above technical solution, each pair of top sheets 213 is clamped at different positions on the nail 4. Therefore, the top edge of the top sheet 213 used to press on the nail 4 can be set to a wider length. At the same time, the top surface of the top sheet 213 is arc-shaped, and the center of the top surface is concave outward, which improves the stability of clamping.

[0055] In an optional embodiment, a buffer pad 113 is provided at the head end of the outer cylinder body 11 , and the buffer pad 113 is made of soft rubber material.

[0056] It should be noted that when the nail 4 is pulled out, the front end of the outer tube body 11 is located close to the bone or limb. The buffer pad 113 can be provided to prevent the device from hitting the limb or bone and causing damage.

[0057] In an optional embodiment, in an upper top portion 111 , a plurality of rotation grooves 114 arranged along the moving direction of the inner cylinder 2 are provided at the bottom of the outer ring rib 112 .

[0058] Through the above technical solution, the rotation groove 114 provides better ductility for each upper top 111 when it is bent. Multiple rotation grooves 114 are provided to adapt to the situation where the adjustment ring 13 is located at different positions on the upper top 111. When the adjustment ring 13 is located at different positions on the upper top 111, the rotation angle of the upper top 111 will change. Setting multiple rotation grooves 114 can maximize the ductility of the bending of the upper top 111.

[0059] In an optional embodiment, the two ends of the rotating shaft column 33 and the two sides of the rotating handle 31 are connected through gear transmission.

[0060] It should be noted that the greater the transmission ratio between the gear on the rotating handle 31 and the gear on the rotating shaft column 33, the less effort it takes to pull out the nail 4, but the shorter the distance pulled out each time the rotating handle 31 is pressed; the smaller the transmission ratio, the longer the distance pulled out each time the rotating handle 31 is pressed, but the greater the force required to pull out the nail 4.

[0061] Specifically, the amplitude of each rotation of the rotating handle 31 is 40 degrees, that is, the gear on the rotating handle 31 rotates 40 degrees, the circumference of the dividing circle of the cylindrical gear 32 is a, and when the transmission ratio is 2, the rotation angle of the gear on the rotating shaft column 33 is 20 degrees, and the distance moved by the inner cylinder 2 is a / 18; when the transmission ratio is 0.5, the rotation angle of the gear on the rotating shaft column 33 is 80 degrees, and the distance moved by the inner cylinder 2 is a / 4.

[0062] In an optional embodiment, a return spring 34 is provided on the rotating shaft column 33 at both ends of the cylindrical gear 32 , one end of the return spring 34 is fixedly connected to the end of the cylindrical gear 32 , and the other end of the return spring 34 is fixedly connected to the inner wall of the outer cylinder 1 shell.

[0063] It should be noted that in addition to providing a return spring 34 on the rotating shaft column 33 so that the cylindrical gear 32 automatically returns to its original position under the action of the return spring 34 after the cylindrical gear 32 is rotated by pressing the rotating handle 31, an elastic component can also be provided between the rotating handle 31 and the fixed handle 12 to make it automatically return to its initial position.

[0064] Embodiment three:

[0065] A nail puller comprises: an outer cylinder 1, comprising an outer cylinder body 11 and a fixed handle 12 arranged at the rear end of the outer cylinder body 11, wherein the outer cylinder body 11 is provided with an outer ring rib 112 protruding inwardly at the front end thereof; an inner cylinder 2, which is sleeved inside the outer cylinder 1, and the inner cylinder 2 comprises an inner cylinder end 21 and an inner cylinder tail 22 respectively clamped at the front end and the tail end of the outer cylinder 1, and a plurality of pressing sheets 211 arranged in a circumferential manner are provided on the inner cylinder end 21, and a gap is provided between two adjacent pressing sheets 211, and the outer side of the pressing sheet 211 is close to the outer cylinder 1. The position of the cylinder 1 is provided with an inner ring rib 212 protruding outward, a top plate 213 for clamping the nail 4 is provided inside the pressing plate 211, a straight notch 221 is provided inside the inner cylinder tail 22, and a bar tooth 222 is provided on one of the upper and lower sides of the straight notch 221; the rotating mechanism 3 includes a cylindrical gear 32 provided in the straight notch 221 and meshing with the bar tooth 222, and the cylindrical gear 32 is installed on the rotating shaft column 33, and the two ends of the rotating shaft column 33 pass through the outer shell of the outer cylinder 1 and are connected to the rotating handle 31. Specifically, the outer cylinder body 11 is connected front and back in the moving direction of the inner cylinder 2, and the inner cylinder tail 22 on the inner cylinder 2 passes through the tail end of the outer cylinder body 11 when moving.

[0066] It should be noted that the tail end of the outer cylinder body 11 is set to be open to facilitate the maintenance of the inner cylinder 2. When the rebound force of the return spring 34 is insufficient, the inner cylinder tail 22 can be manually pushed to recover.

[0067] Embodiment 2:

[0068] A nail puller comprises: an outer cylinder 1, comprising an outer cylinder body 11 and a fixed handle 12 arranged at the rear end of the outer cylinder body 11, wherein the outer cylinder body 11 is provided with an outer ring rib 112 protruding inwardly at the front end thereof; an inner cylinder 2, which is sleeved inside the outer cylinder 1, and the inner cylinder 2 comprises an inner cylinder end 21 and an inner cylinder tail 22 respectively clamped at the front end and the tail end of the outer cylinder 1, and a plurality of pressing sheets 211 arranged in a circumferential manner are provided on the inner cylinder end 21, and a gap is provided between two adjacent pressing sheets 211, and the outer side of the pressing sheet 211 is close to the outer cylinder 1. The position of the cylinder 1 is provided with an inner ring rib 212 protruding outward, a top plate 213 for clamping the nail 4 is provided inside the pressing plate 211, a straight notch 221 is provided inside the inner cylinder tail 22, and a bar tooth 222 is provided on one of the upper and lower sides of the straight notch 221; the rotating mechanism 3 includes a cylindrical gear 32 provided in the straight notch 221 and meshing with the bar tooth 222, the cylindrical gear 32 is installed on the rotating shaft column 33, and the two ends of the rotating shaft column 33 pass through the outer shell of the outer cylinder 1 and are connected to the rotating handle 31. Specifically, the outer cylinder body 11 is provided with an opening at the front end corresponding to the inner cylinder end 21, and the outer cylinder body 11 is also provided with a shell covering the inner cylinder tail 22 at the tail end position corresponding to the inner cylinder tail 22, and the inner cylinder 2 is always located inside the outer cylinder body 11 when moving.

[0069] It should be noted that wrapping the inner cylinder tail portion 22 inside the outer cylinder body 11 can provide sealing, thereby preventing foreign matter from entering and causing the cylindrical gear 32 and the bar teeth 222 to mesh unsmoothly.

[0070] Working principle: insert the nail 4 into the inner cylinder 2, press the rotating handle 31 to rotate it toward the fixed handle 12, and the rotating handle 31 rotates to drive the rotating shaft column 33 and the cylindrical gear 32 on the rotating shaft column 33 to rotate. Since the cylindrical gear 32 is meshed with the bar teeth 222 on the tail portion 22 of the inner cylinder, the rotation of the cylindrical gear 32 will drive the inner cylinder 2 to move toward the tail end of the outer cylinder body 11. When the inner cylinder 2 moves, the pressing sheet 211 presses on the outer ring rib 112, so that the pressing sheet 211 bends inwardly. The pressing sheet 211 bends inwardly so that the top sheet 213 presses on the nail 4. Multiple groups of top sheets 213 symmetrically located at different positions clamp the nail 4, so that the nail 4 moves with the inner cylinder 2, and the two steps of clamping and pulling out are completed at the same time.

[0071] For nails 4 of different sizes, when the adjusting ring 13 is located near the rear end of the outer tube body 11, as shown in FIG. Figure 1 and 3 As shown in FIG. 1 , when the inner tube 2 is pulled inward, the pressing piece 211 is pushed inward by the outer ring rib 112. Since the adjusting ring 13 is located near the rear end of the outer tube body 11, the upper top 111 is greatly bent when subjected to outward pressure, so that the top piece 213 can clamp the nail 4 with a larger size. When the adjusting ring 13 is located near the front end of the outer tube body 11, as shown in FIG. Figure 2 and 4 As shown, when the inner tube 2 is pulled inward, the pressing piece 211 is pushed inward by the action of the outer ring rib 112. Since the adjustment ring 13 is located near the front end of the outer tube body 11, the adjustment ring 13 limits the outward bending arc of the upper top 111. Therefore, when the upper top 111 is subjected to outward pressure, the bending amplitude is small, so that the top piece 213 can clamp the nail 4 of smaller size.

[0072] In summary, the nail puller is provided with an inner cylinder 2 inside the outer cylinder 1, a pressing piece 211 and a straight slot 221 are respectively provided at the head and tail ends of the inner cylinder 2, a bar tooth 222 meshing with the cylindrical gear 32 is provided in the straight slot 221, an inner ring rib 212 protruding outward and an outer ring rib 112 protruding inward are respectively provided on the inner side of the pressing piece 211 and the outer cylinder 1, when the handle 31 is rotated, the cylindrical gear 32 is driven to rotate, so that the inner cylinder 2 moves inward, and at the same time, the inner ring rib 212 presses on the outer ring rib 112, so that the pressing piece 211 bends inward, so that the top piece 213 is clamped on the nail 4, and at this time, the handle 31 is continued to be rotated to drive the nail 4 to be pulled out, so as to realize the integrated clamping and pulling of the nail 4, and the operation is simple, and since the moving direction of the inner cylinder 2 is fixed, the nail 4 can be pulled out more stably.

[0073] The nail puller is provided with an adjustment ring 13 outside the outer tube body 11. Changing the position of the adjustment ring 13 on the upper top 111 can change the outward bending amplitude of the upper top 111, thereby changing the inward pressure of the pressing plate 211 on the upper top 111, thereby achieving the purpose of clamping nails 4 of different sizes.

[0074] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0075] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A nail puller, characterized in that: include: The outer cylinder (1) comprises an outer cylinder body (11) and a fixed handle (12) arranged at the rear end of the outer cylinder body (11); the outer cylinder body (11) is provided with an outer ring rib (112) protruding inwardly at the front end thereof; The inner cylinder (2) is sleeved inside the outer cylinder (1), the inner cylinder (2) comprising an inner cylinder end (21) and an inner cylinder tail (22) respectively clamped at the front end and the tail end of the outer cylinder (1), the inner cylinder end (21) is provided with a plurality of circumferentially arranged pressing sheets (211), a gap is provided between two adjacent pressing sheets (211), an outer side of the pressing sheet (211) is provided with an inner ring convex rib (212) protruding outward at a position close to the outer cylinder (1), a top sheet (213) for clamping the nail (4) is provided on the inner side of the pressing sheet (211), a straight notch (221) is provided inside the inner cylinder tail (22), and a strip tooth (222) is provided on one of the upper and lower sides of the straight notch (221); The rotating mechanism (3) comprises a cylindrical gear (32) arranged in the straight slot (221) and meshing with the bar teeth (222), the cylindrical gear (32) being mounted on a rotating shaft column (33), and both ends of the rotating shaft column (33) pass through the outer shell of the outer cylinder (1) and are connected to the rotating handle (31).

2. A nail puller according to claim 1, characterized in that: The front end of the outer cylinder body (11) is divided into a plurality of upper tops (111) with gaps, and each upper top (111) is provided with an independent outer ring convex rib (112) at the bottom. The outer cylinder body (11) is also provided with an adjustment ring (13), and the adjustment ring (13) is connected to the outer side of the outer cylinder body (11) through a thread. The position of the adjustment ring (13) on the outer cylinder body (11) is changed by rotating the adjustment ring (13), thereby changing the outward elastic force of the upper top (111).

3. A nail puller according to claim 2, characterized in that: Each outer ring convex rib (112) is provided with an inclined outer ring slope (115) at a position close to the front end of the outer cylinder (1), and each inner ring convex rib (212) is provided with an inner ring slope (214) at a side close to the outer ring slope (115), wherein the angle between the outer ring slope (115) and the moving direction of the inner cylinder (2) is greater than or equal to the angle between the inner ring slope (214) and the moving direction of the inner cylinder (2).

4. A nail puller according to claim 2, characterized in that: The number of the pressing sheets (211) on the inner cylinder end (21) is an even number greater than or equal to 4, the top sheets (213) on every two symmetrical pressing sheets (211) are located at the same position, and the top sheets (213) on the two asymmetrical pressing sheets (211) are located at different positions on the inner cylinder end (21).

5. A nail puller according to claim 1, characterized in that: The outer cylinder body (11) is provided with a buffer pad (113) at the head end, and the buffer pad (113) is made of soft rubber material.

6. A nail puller according to claim 2, characterized in that: In an upper top portion (111), a plurality of rotation grooves (114) arranged along the moving direction of the inner cylinder (2) are provided at the bottom of the outer ring rib (112).

7. A nail puller according to claim 1, characterized in that: The two ends of the rotating shaft column (33) are connected to the two sides of the rotating handle (31) through gear transmission.

8. The nail puller according to claim 1, characterized in that: The rotating shaft column (33) is provided with a return spring (34) at both ends of the cylindrical gear (32), one end of the return spring (34) is fixedly connected to the end of the cylindrical gear (32), and the other end of the return spring (34) is fixedly connected to the inner wall of the outer cylinder (1).

9. The nail puller according to claim 1, characterized in that: The outer cylinder body (11) penetrates front to back in the moving direction of the inner cylinder (2), and the inner cylinder tail (22) on the inner cylinder (2) passes through the tail end of the outer cylinder body (11) when moving.

10. The nail puller according to claim 1, characterized in that: The outer cylinder body (11) is provided with an opening at the front end corresponding to the inner cylinder end (21), and the outer cylinder body (11) is also provided with a shell wrapping the inner cylinder tail (22) at the tail end corresponding to the inner cylinder tail (22), and the inner cylinder (2) is always located inside the outer cylinder body (11) when moving.

Images