A screwdriver

Abstract

This utility model provides a screwdriver, including a shank and a cutting head disposed at the end of the shank. The screwdriver is characterized by further including a sheath, which comprises a sleeve portion and a clamping portion. The sleeve portion is slidably fitted onto the outer periphery of the shank. The clamping portion includes at least two first elastic clips extending axially from one end of the sleeve portion. The at least two first elastic clips are spaced apart circumferentially along the sleeve portion and allow screws to axially extend into the clamping portion. A first elastic element is fitted around the outer periphery of the clamping portion. The first elastic element acts on each of the first elastic clips, causing the first elastic clips to always tend to move closer together and clamp the screw. This screwdriver, by providing a sheath on the shank, with a clamping portion at the front end capable of holding the screw, utilizes the elasticity of the multiple first elastic clips in the clamping portion and the radial force of the first elastic element to clamp the screw during installation and removal, preventing the screw from falling out and being lost.

Description

Technical Field

[0001] This utility model relates to the field of tool technology, and in particular to a screwdriver. Background Technology

[0002] Screws are common fasteners widely used in machinery manufacturing, construction, and other fields to connect and secure different components. Screws come in various sizes to suit different needs. Screwdrivers are common tools used to tighten or loosen screws, using rotational force to secure or remove them.

[0003] A common example is the screwdriver disclosed in Chinese utility model patent CN202420718584.5 (authorization announcement number CN222726593U), which includes a screwdriver body and a screwdriver head mounted on top of the screwdriver body. The screwdriver head is equipped with a screwdriver head magnet, which can firmly attract the screw to the screwdriver head magnet. Users do not need to worry about the screw falling off. This not only reduces the difficulty of the work, but also reduces the damage or waste that may be caused by the screw falling off.

[0004] However, when the screws to be installed or removed are made of stainless steel, copper, or other non-magnetic materials, the screwdrivers mentioned above will still face the problem of screws easily falling out and being lost due to their lack of magnetic attraction, resulting in losses. Spending time searching for fallen screws will extend working time and reduce work efficiency. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a screwdriver with a simple structure that can prevent screws from falling off and being lost, in view of the above-mentioned existing technology. It is especially suitable for assembling and disassembling screws made of stainless steel, copper or other non-magnetic materials.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problem is as follows: The screwdriver includes a shank and a cutting head disposed at the end of the shank, characterized in that: it further includes a sleeve, the sleeve including a tube portion and a clamping portion, the tube portion being slidably sleeved on the outer periphery of the shank, the clamping portion including at least two first elastic clips extending axially from one end of the tube portion, the at least two first elastic clips being spaced apart circumferentially along the tube portion and allowing screws to axially extend into the clamping portion, the outer periphery of the clamping portion being sleeved with a first elastic element, the first elastic element acting on each of the first elastic clips, so that each of the first elastic clips always has a tendency to move closer to each other and can clamp the screw.

[0007] To facilitate the fitting and positioning of the first elastic element on the outer periphery of the clamping portion, preferably, each of the first elastic clips has a first recess on its outer surface for fitting the first elastic element and adjacent to the extended end of the first elastic clip. Each of the first recesses is brought together by the first elastic element and can clamp the screw. Thus, when the first elastic element is fitted into the first recess, it can be reliably confined within the first recess, while the elastic force exerted by the first elastic element on the clamping portion is concentrated at the bottom of the first recess, enhancing the clamping force of each first elastic clip.

[0008] Preferably, to improve the elasticity of each first elastic clip, the wall thickness of the tool holder is chosen to be relatively thin. Therefore, when the first recess is formed on the outer surface of the first elastic clip, a radially inward protrusion structure naturally forms on the inner surface of each first recess. At this time, the axial inner side of each protrusion can together form a clamping area for clamping the screw head, and the axial outer side of each protrusion forms a guide surface to facilitate the screw head entering the clamping area. In use, the screw head acts on the guide surface, causing each first elastic clip to elastically deform, and the protrusions move away from each other, allowing the screw head to pass over the protrusions and enter the clamping area. After the screw head enters the clamping area, the guide surface loses the screw's force, and under the action of the first elastic element, the protrusions move closer together, limiting the screw head within the clamping area.

[0009] Preferably, the outer periphery of the clamping part is further sleeved with a second elastic element that is spaced apart from the first elastic element along the axial direction. Correspondingly, the first elastic clip is provided with a second recess for the second elastic element to be sleeved on, and the second recess is brought together by means of the second elastic element. The second elastic element has a dual function: first, since the first elastic clip has a certain length, when the first elastic element acts on the first elastic clip at its extended end, the middle parts of each first elastic clip may separate and bulge outward, thereby affecting the clamping part's clamping of the screw. The second elastic element can prevent the middle parts of each first elastic clip from separating, so that the clamping area can better clamp the screw; second, the second recesses coming together form a certain constraint force on the tool holder, making it difficult for the tool sleeve to slip off the tool holder.

[0010] To ensure that the second recess can constrain the tool holder, preferably, the axial distance d1 between the first and second recesses and the length d2 of the tool head satisfy the condition: d1 > d2. If the axial distance between the first and second recesses is too small, the first recesses cannot constrain the tool holder when they come together. Therefore, the distance between the first and second recesses is set to be greater than the length of the tool head to ensure that the elastic force of the second elastic element can act on the tool holder.

[0011] To ensure that the sleeve can be slidably fitted onto the outer periphery of the tool holder without easily detaching from it, preferably, at least two second elastic clips extend axially from the other end of the sleeve. These at least two second elastic clips are spaced apart circumferentially along the sleeve to collectively form a constraint portion for clamping the end of the tool holder away from the tool tip. A third elastic element is fitted around the outer periphery of the constraint portion, ensuring that the second elastic clips always tend to move closer together. More preferably, each second elastic clip has a third recess for the third elastic element to fit onto, and this third recess is adjacent to the extended end of the second elastic clip. Thus, by the third elastic element acting on the third recess, the third recesses move closer together and press against the tool holder. The friction between the third recess and the tool holder secures the sleeve to the tool holder. Because the two are connected by friction, relative sliding can occur between them when the operator acts on the sleeve or tool holder axially.

[0012] To make the connection between the tool holder and the tool shank more stable, preferably, a fourth elastic element is also fitted onto the constraint part. The fourth elastic element is spaced apart from the third elastic element along the axial direction. Correspondingly, each of the second elastic clips has a fourth recess for the fourth elastic element to be fitted onto. The fourth elastic element acts on the fourth recess, so that the fourth recesses of each of the second elastic clips always tend to move closer to each other. The fourth elastic element has the same function as the third elastic element, and the fourth elastic element is provided at intervals from the third elastic element, which can provide double protection for the connection between the tool holder and the tool shank.

[0013] A preferred embodiment is that the fourth elastic element is located at the middle part of the second elastic clip, which makes the restraining effect better.

[0014] To facilitate applying rotational force to install and remove screws, preferably, the end of the screwdriver shank away from the screwdriver tip is also provided with a handle.

[0015] Compared with the prior art, the advantages of this utility model are as follows: This screwdriver has a blade sleeve on the blade shank, and the front end of the blade sleeve has a clamping part that can hold the screw. By utilizing the elasticity of multiple first elastic clips in the clamping part and the radial force of the first elastic element, the screw can be easily clamped during installation and removal, preventing the screw from falling and being lost. Because it adopts a physical clamping method, this screwdriver is suitable for screws made of any material, that is, screws made of materials that can be magnetically attracted, such as iron and carbon steel, or screws made of stainless steel, copper, or other non-magnetically attracted materials can all be used. In addition, the overall structure is simple, the cost is low, and the operation is convenient. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0017] Figure 2This is a partial cross-sectional view of the blade sheath in an embodiment of the present invention. Detailed Implementation

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

[0019] like Figure 1-2 The figure shown is a preferred embodiment of the present invention.

[0020] The screwdriver of this embodiment includes a shank 1, a cutting head 2 located at the end of the shank 1, and a handle 7 located at the end of the shank 1 away from the cutting head 2. When the cutting head 2 is pressed against the screw A, applying a rotational force to the handle 7 can tighten or loosen the screw A, thereby installing or removing the screw A.

[0021] To prevent screws from falling out and being lost during disassembly, especially screws made of stainless steel, copper, or other non-magnetic materials, this embodiment makes special improvements to the screwdriver. Specifically, the screwdriver in this embodiment also includes a sheath 3, which includes a sleeve portion 31 and a clamping portion 32. The sleeve portion 31 is slidably fitted onto the outer periphery of the screwdriver shank 1. The clamping portion 32 includes four first elastic clips 321 extending axially from one end of the sleeve portion 31 (the number of first elastic clips 321 can be set as needed, such as two or three). The four first elastic clips 321 are spaced apart circumferentially along the sleeve portion 31 and allow screws to extend axially into the clamping portion 32. A first elastic member 41 is fitted onto the outer periphery of the clamping portion 32. Correspondingly, the outer surface of each first elastic clip 321 has a first recess 322 for the first elastic member 41 to be fitted onto and adjacent to the extended end of the first elastic clip 321. Each first recess 322 tends to move closer together by means of the first elastic member 41 and can clamp the screw. The first recess 322 confines the first elastic member 41 within it, concentrating the elastic force of the first elastic member 41 acting on the clamping part 32 at the bottom of the first recess 322, thereby enhancing the clamping force of each first elastic clip 321. Specifically, the screw is clamped as follows: the inner surface of each first recess 322 has a radially inwardly protruding 324 (this protrusion 324 can be naturally formed during the machining of the first recess 322). The axially inner side (near the sleeve part 31) of each protrusion 324 collectively forms a clamping area 5 for clamping the screw head, and the axially outer side (near the extension end of the first elastic clip 321) of each protrusion 324 forms a guide surface 6 to facilitate the screw head entering the clamping area 5. In use, the head of the screw acts on the guide surface 6, causing each of the first elastic clips 321 to undergo elastic deformation. The protrusions move away from each other, allowing the head of the screw to pass over the protrusions 324 and enter the clamping area 5. After the head of the screw enters the clamping area 5, the guide surface 6 loses the force of the screw, and under the action of the first elastic element 41, the first recesses 322 of each of the first elastic clips 321 move closer to each other, limiting the head of the screw within the clamping area 5.

[0022] In order to ensure that the tool holder 3 can be stably connected to the tool holder 1, the outer periphery of the clamping part 32 is provided with a second elastic element 42 that is spaced apart from the first elastic element 41 along the axial direction. Correspondingly, each first elastic clip 321 is provided with a second recess 323 for the second elastic element 42 to be fitted. In the figure, the second recess 323 is approximately located in the middle part of the first elastic clip 321, and the axial distance d1 between the first recess 322 and the second recess 323 satisfies the condition that d1>d2 with respect to the length d2 of the tool head 2. Each second recess 323 is brought closer together by means of the second elastic element 42. Since the first elastic clip 321 has a certain length, when the first elastic member 41 acts on the first elastic clip 321 at the extended end, the middle parts of each first elastic clip 321 may separate from each other, which will affect the clamping part 32's clamping of the screw. Therefore, the added second elastic member 42 can form a constraint on the middle parts of each first elastic clip 321, preventing the middle parts of each first elastic clip 321 from separating from each other, so that the clamping area 5 can better clamp the screw. In addition, the second elastic member 42 acts on the second recess 323, causing the second recess 323 to move closer together and form a constraint on the tool holder 1, making the connection between the tool sleeve 3 and the tool holder 1 more stable.

[0023] As one way the sleeve portion 31 is slidably connected to the outer periphery of the tool holder 1, in this embodiment, the other end of the sleeve portion 31 extends axially to form four second elastic clamping pieces 331 (again, the number of these second elastic clamping pieces 331 can be designed as needed, such as two or three). The four second elastic clamping pieces 331 are spaced apart circumferentially along the sleeve portion 31 to form a constraint portion 33 for clamping the end of the tool holder 1 away from the tool head 2. A third elastic member 43 is sleeved on the outer periphery of the constraint portion 33. The third elastic member 43 acts on the outer periphery of the constraint portion 33 to make the second elastic clamping pieces 331 move closer together and squeeze the tool holder 1. The frictional force generated by the mutual squeezing between the second elastic clamping pieces 331 and the tool holder 1 connects the sleeve portion 31 to the tool holder 1. Since the tool holder 1 is clamped by the frictional force of the second elastic clamping pieces 331, when the operator applies force along the axial direction of the tool sleeve 3 to the tool sleeve 3 or the tool holder 1, relative sliding can occur between the two. To achieve better binding force, specifically, the outer periphery of the restraint part 33 is also fitted with a fourth elastic member 44 that is spaced apart from the third elastic member 43 along the axial direction. Correspondingly, the second elastic clip 331 is provided with a third recess 332 for the third elastic member 43 to be fitted and a fourth recess 333 for the fourth elastic member 44 to be fitted. The third recess 332 is adjacent to the extension end of the second elastic clip 331, and the fourth recess 333 is located at the middle part of the second elastic clip 331. The third elastic member 43 acts on the third recess 332, so that the third recesses 332 of each second elastic clip 331 always tend to move closer to each other. The fourth elastic member 44 acts on the fourth recess 333 (that is, the fourth elastic member 44 is located at the middle part of the second elastic clip 331), so that the fourth recesses 333 of each second elastic clip 331 always tend to move closer to each other. The third elastic element 43 and the fourth elastic element 44 (two elastic elements) are set to work together on the tool holder 1, providing double protection for the connection between the tool sleeve 3 and the tool holder 1, making the connection between the two more stable.

[0024] To facilitate the manufacture of the blade sheath 3, in this embodiment, the blade sheath 3 is a thin-walled stainless steel tube. Two indentations are pressed into each end of the thin-walled stainless steel tube, resulting in four indentations with a depth of 0.5-1mm. These are respectively the first recess 322, the second recess 323, the third recess 332, and the fourth recess 333. Corresponding protrusions are formed on the inner walls of the corresponding sections. The first recess 322 and the third recess 332 are each 1mm away from the two ends of the thin-walled stainless steel tube. The two ends of the thin-walled stainless steel tube are cut into four equal parts. The four parts at one end form four first elastic clips 321, and the other end forms four second elastic clips 331. The deepest cuts are 2cm away from the second recess 323 and the fourth recess, respectively. Each elastic element can be a spring coil, rubber ring, or other elastic element with radial contraction capability. Therefore, the overall structure is simple, low-cost, and easy to manufacture.

[0025] In summary, the screwdriver usage method in this embodiment is as follows:

[0026] When installing screws: Place the screwdriver sleeve 3 on the screwdriver bar 1, insert the screw head into the clamping part 32, so that the head enters the clamping area 5, slide the screwdriver bar 1 so that the screwdriver head 2 abuts against the screw, rotate the screwdriver to screw the screw into the object to be installed, after the screw is screwed in until it will not fall out, pull out the screwdriver, remove the screwdriver sleeve 3 and further tighten the screw.

[0027] When removing screws: With the tool holder 3 in the disassembled state, first loosen the screw, put the tool holder 3 on the tool bar 1, and clamp the screw with the clamping part 32, and then completely remove the screw.

[0028] By using the three-pronged clamping device to hold the screws, screws can be prevented from falling out and being lost during installation and removal, thus improving work efficiency.

Claims

1. A screwdriver, comprising a shank (1) and a cutting head (2) disposed at the end of the shank (1), characterized in that: It also includes a tool holder (3), which includes a sleeve portion (31) and a clamping portion (32). The sleeve portion (31) is slidably sleeved on the outer periphery of the tool bar (1). The clamping portion (32) includes at least two first elastic clips (321) extending axially from one end of the sleeve portion (31). The at least two first elastic clips (321) are spaced apart circumferentially along the sleeve portion (31) and allow screws to be axially inserted into the clamping portion (32). A first elastic element (41) is sleeved on the outer periphery of the clamping portion (32). The first elastic element (41) acts on each of the first elastic clips (321) so that each of the first elastic clips (321) always tends to move closer to each other and can clamp the screw.

2. The screwdriver according to claim 1, characterized in that: Each of the first elastic clips (321) has a first recess (322) on its outer surface for the first elastic member (41) to be fitted and adjacent to the extended end of the first elastic clip (321). Each of the first recesses (322) is brought together by means of the first elastic member (41) and can hold the screw recess.

3. The screwdriver according to claim 2, characterized in that: The inner surface of each of the first recesses (322) protrudes radially inward (324), and the axial inner side of each of the protrusions (324) together forms a clamping area (5) for clamping the head of the screw, and the axial outer side of each of the protrusions (324) forms a guide surface (6) for the head of the screw to enter the clamping area (5).

4. The screwdriver according to claim 2, characterized in that: The outer periphery of the clamping part (32) is also provided with a second elastic element (42) that is spaced apart from the first elastic element (41) along the axial direction. Correspondingly, each of the first elastic clips (321) is provided with a second recess (323) for the second elastic element (42) to be fitted. The second recesses (323) are brought closer together by means of the second elastic element (42).

5. The screwdriver according to claim 4, characterized in that: The axial distance d1 between the first recess (322) and the second recess (323) satisfies the following relationship with the length d2 of the cutter head (2): d1>d2.

6. The screwdriver according to claim 1, characterized in that: The other end of the sleeve portion (31) extends axially to form at least two second elastic clips (331). The at least two second elastic clips (331) are arranged circumferentially along the sleeve portion (31) to jointly form a constraint portion (33) for clamping the end of the tool bar (1) away from the tool head (2). A third elastic element (43) is sleeved on the outer periphery of the constraint portion (33) so that each second elastic clip (331) always tends to move closer to each other.

7. The screwdriver according to claim 6, characterized in that: Each of the second elastic clips (331) has a third recess (332) for the third elastic member (43) to be fitted, and the third recess (332) is adjacent to the extension end of the second elastic clip (331).

8. The screwdriver according to claim 6, characterized in that: The constraint part (33) is also fitted with a fourth elastic element (44). The fourth elastic element (44) and the third elastic element (43) are spaced apart along the axial direction. Correspondingly, each of the second elastic clips (331) has a fourth recess (333) for the fourth elastic element (44) to be fitted. The fourth elastic element (44) acts on the fourth recess (333) so that the fourth recess (333) of each of the second elastic clips (331) always tends to move closer to each other.

9. The screwdriver according to claim 8, characterized in that: The fourth elastic element (44) is located at the middle part of the second elastic clip (331).

10. The screwdriver according to claim 1, characterized in that: The end of the cutter bar (1) away from the cutter head (2) is also provided with a handle (7).

Images