Fall prevention devices and tools

Abstract

To provide a fall prevention device and tool that can reduce the manufacturing cost of sockets without requiring structural changes to the socket itself. [Solution] The fall prevention device 3 is a fall prevention device for a socket 10 relating to a tool 1 having a rotationally driven socket 10 and an operating part 20 into which the socket 10 can be attached and detached, and comprises a cylindrical part 30 into which the socket 10 can be inserted and which rotates in synchronization with the socket 10, and a connecting part 40 that connects the operating part 20, which corresponds to a restraining part for suppressing the fall of the socket 10, and the cylindrical part 30, and the connecting part 40 has a rotating part 41 that is rotatably provided around the axis C of the cylindrical part 30, and a connecting member 42 that connects the rotating part 41 and the operating part 20.

Description

Technical Field

[0001] The present invention relates to a fall prevention device and a tool.

Background Art

[0002] Conventionally, for tightening bolts and nuts, manual tools using a ratchet mechanism or the like, or power tools that electrically rotate and drive an output shaft are used. A socket corresponding to the size of a bolt or the like is appropriately selected, and the selected socket is attached to the output shaft of the tool. The attachment for preventing rotation tool from falling described in Patent Document 1 includes a connecting member that connects a power tool and a rotating tool corresponding to a socket that is detachably attached to the rotating output portion of the power tool, a fixing portion that can be fixed to the power tool side at the base end portion of the connecting member, a hook member disposed at the tip end portion of the connecting member, an annular groove portion formed on the outer peripheral portion of the rotating tool, a ring-shaped spring that is rotatably fitted in the annular groove portion, and a pair of opposing finger clamping portions disposed at both open end portions of the ring-shaped spring for expanding the reduced-diameter ring portion of the ring-shaped spring against the spring pressure.

[0003] According to the attachment for preventing rotation tool from falling described in Patent Document 1, even if breakage occurs between the rotating output portion of the power tool and the rotating tool, the connecting member can prevent the rotating tool from falling. Further, the ring-shaped spring can be easily attached to and detached from the rotating tool by fitting and removing the reduced-diameter ring portion of the ring-shaped spring and the annular groove portion, and it is said that the replacement work of the rotating tool due to size change can be easily performed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the rotary tool fall prevention attachment described in Patent Document 1, a ring-shaped spring is attached to the annular groove when the socket is replaced, which necessitates a change in the specifications of the socket. In other words, since an annular groove is formed on the outer circumference of the socket, machining of the socket is required, which may increase the manufacturing cost of the socket.

[0006] Therefore, the present invention aims to provide a fall prevention device and tool that can reduce the manufacturing cost of a socket without requiring any structural changes to the socket. [Means for solving the problem]

[0007] The fall prevention device of the present invention relates to a tool having a rotationally driven socket and an operating part into which the socket can be attached and detached, and is a fall prevention device for the socket, comprising a cylindrical part into which the socket can be inserted and which rotates in synchronization with the socket, and a connecting part that connects a suppressing part for suppressing the fall of the socket and the cylindrical part, wherein the connecting part comprises a rotating part that is rotatably provided around the axis of the cylindrical part and a connecting member that connects the rotating part and the suppressing part.

[0008] With this configuration, since the cylindrical part is connected to the restraining part via the connecting part, even if the socket comes off the operating part, the socket can be connected to the restraining part via the cylindrical part, preventing the socket from falling. Furthermore, since the connecting part has a rotating part that is rotatable around the axis of the cylindrical part and a connecting member that connects the rotating part and the restraining part, the rotating part can be connected to the restraining part without changing the structure of the socket. Therefore, the manufacturing cost of the tool can be reduced.

[0009] Furthermore, the socket may have a main body connected to the operating part, and the cylindrical part may be made of an elastic material and have an opening with a diameter smaller than the outer diameter of the main body.

[0010] With this configuration, the cylindrical portion is made of an elastic material and has an opening with a diameter smaller than the outer diameter of the main body, so that the main body of the socket can be fitted into the opening of the cylindrical portion from the axial direction. By fitting the main body into the opening of the cylindrical portion, the cylindrical portion is fixed to the main body by its own elastic force, and the socket and the cylindrical portion can rotate synchronously.

[0011] Furthermore, the cylindrical portion may have an extension that extends radially inward, and this extension may form the opening.

[0012] With this configuration, since it has an extension that extends radially inward, the socket can be easily fitted into the opening of the cylindrical part, and it is difficult to pull the socket out of the opening of the cylindrical part.

[0013] Furthermore, the connecting member may have a locking portion that can be locked to the operating portion when the socket is attached to the operating portion, a first side portion that connects the rotating portion and one end of the locking portion, and a second side portion that connects the rotating portion and the other end of the locking portion, wherein the first side portion has a first biasing portion that biases the rotating portion toward the operating portion when the locking portion is locked to the operating portion, and the second side portion may have a second biasing portion that biases the rotating portion toward the operating portion when the locking portion is locked to the operating portion.

[0014] With this configuration, the first side portion has a first biasing portion that biases the rotating portion toward the operating portion when the locking portion is locked to the operating portion, and the second side portion has a second biasing portion that biases the rotating portion toward the operating portion when the locking portion is locked to the operating portion, thereby preventing the socket from coming loose. As a result, it is possible to prevent the socket from falling.

[0015] Furthermore, the device may also be equipped with a fall prevention device as described in any one of claims 1 to 3.

[0016] With this configuration, it is possible to obtain a tool that can reduce the manufacturing cost of fall prevention devices. [Effects of the Invention]

[0017] According to the present invention, it is possible to provide a fall prevention tool and a tool that can suppress the manufacturing cost of a socket without requiring structural changes to the socket.

Brief Description of the Drawings

[0018] [Figure 1] It is a figure which shows the tool which concerns on Embodiment 1. [Figure 2] It is a figure which shows a socket and a fall prevention tool. [Figure 3] It is a longitudinal sectional view of a cylindrical part. [Figure 4] It is a sectional view taken along line IV-IV of FIG. 3. [Figure 5] It is a figure which shows the socket and the fall prevention tool which concern on Embodiment 2. [Figure 6] It is a plan view of a socket and a fall prevention tool. [Figure 7] It is a figure which shows the socket and the fall prevention tool which concern on Embodiment 3. [Figure 8] It is a sectional view taken along line VIII-VIII of FIG. 7. [[ID=----]]

Modes for Carrying Out the Invention

[0019] Hereinafter, embodiments of the tool according to the present invention will be described with reference to the drawings.In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

[0020] <Embodiment 1> Referring to FIGS. 1 to 4, the tool 1 according to Embodiment 1 of the present invention will be described. FIG. 1 is a view showing the tool 1 according to Embodiment 1. FIG. 2 is a view showing the socket 10 and the fall prevention tool 3. FIG. 3 is a longitudinal sectional view of the cylindrical portion 30. FIG. 4 is a sectional view taken along line IV-IV of FIG. 3. The tool 1 is, for example, a tool for manually fastening a bolt or a nut to a fastening object.

[0021] As shown in Figure 1, the tool 1 comprises a socket wrench 2 and a fall prevention device 3. The socket wrench 2 has a socket 10 and an operating part 20.

[0022] The operating unit 20 is held by the user. The operating unit 20 is configured to detachably attach the socket 10 and rotate the socket 10 around its axis. The operating unit 20 is made of a metal material and is elongated in shape. The operating unit 20 has a head 21 and a handle 22.

[0023] For the sake of explanation, the direction from head 21 to socket 10 will be referred to as forward X1, the opposite direction as rearward X2, and the front-to-back direction will be referred to as front-to-back direction X. Also, the direction from handle 22 to head 21 will be referred to as upward Z1, the opposite direction as downward Z2, and the up-and-down direction will be referred to as up-and-down direction Z. Furthermore, when the socket wrench 2 is viewed from the front X1 with head 21 positioned upward Z1, the left side of the socket wrench 2 will be referred to as left-to-right direction Y1, the opposite direction as right-to-right direction Y2, and the left-to-right direction will be referred to as left-to-right direction Y.

[0024] The head 21 rotatably supports the socket 10. A ratchet wheel (not shown) is housed inside the head 21. An output shaft 211, on which the socket 10 is mounted, is integrally formed with the ratchet wheel. The rectangular output shaft 211 engages with a ratchet pawl (not shown) pivotally supported by the head 21. This allows the socket 10 to rotate in only one direction by the ratchet wheel.

[0025] The handle 22 is operated by the user. Specifically, the handle 22 rotates around the head 21 as the center of rotation, thereby rotating the socket 10 around its axis. A gripping strap 23 is provided at the lower end of the handle 22.

[0026] The gripping strap 23 forms, for example, a loop for connecting to the user's equipment during user operation, or a loop for attaching to the user's own arm. Both ends of the gripping strap 23 are fixed to the lower end of the handle 22.

[0027] The socket 10 fastens a bolt or nut. The socket 10 is made of tool steel. Multiple sizes of sockets are available depending on the size of the bolt or nut to be fastened. As shown in Figure 2, the socket 10 has a main body 11 and a housing 12.

[0028] The main body 11 is connected to the operating unit 20. The main body 11 is attached to the front side of the head 21 (see Figure 1). The main body 11 is formed in a cylindrical shape and corresponds to the rear part of the socket 10. The outer diameter of the main body 11 is diameter d1. The main body 11 has an insertion angle 111 inside.

[0029] The socket angle 111 is a rectangular parallelepiped recess. The socket angle 111 is formed from the rear end of the main body 11 toward the front X1. By fitting the socket angle 111 with the output shaft 211 (see Figure 1), rotational force around axis C is transmitted from the head 21.

[0030] The housing portion 12 is formed in a cylindrical shape and corresponds to the front part of the socket 10. The outer diameter D of the housing portion 12 is larger than the outer diameter d1 of the main body portion 11. Therefore, a stepped portion is formed at the boundary between the housing portion 12 and the main body portion 11. The housing portion 12 rotates around the same axis C as the main body portion 11. The housing portion 12 has an opening 121 inside it.

[0031] The opening 121 is, for example, a recess formed in a hexagonal hole. The opening 121 is formed from the front end of the housing 12 toward the rear X2. The opening 121 accommodates a bolt or nut (neither of which are shown) and rotates the bolt or nut around axis C. This fastens the bolt or nut to the object to be fastened (not shown).

[0032] Next, the fall prevention device 3 will be described with reference to Figures 2 to 4. The fall prevention device 3 is a fall prevention device for the socket 10. Specifically, the fall prevention device 3 maintains the connection between the socket 10 and the operating part 20 even if the socket 10 detaches from the operating part 20 and becomes separated from the operating part 20. As shown in Figures 2 and 3, the fall prevention device 3 has a cylindrical part 30 and a connecting part 40.

[0033] The cylindrical portion 30 is fixed to the socket 10. The cylindrical portion 30 is inserted into the socket 10. The cylindrical portion 30 is made of an elastic material, such as silicone rubber, and is formed into a cylindrical shape. In other words, the cylindrical portion 30 is cylindrical into which the socket 10 can be inserted.

[0034] The cylindrical portion 30 is attached to the outer circumference of the main body portion 11. The cylindrical portion 30 has the same axis C as the socket 10 (main body portion 11, housing portion 12). The cylindrical portion 30 rotates around axis C in synchronization with the socket 10. As shown in Figures 2 to 4, the cylindrical portion 30 has a cylindrical main body portion 31 and an extension portion 32.

[0035] The cylindrical body portion 31 forms the outer circumference of the cylindrical portion 30. The cylindrical body portion 31 covers the surface of the main body portion 11 from the front end to the rear end. The outer diameter of the cylindrical body portion 31 is larger than the outer diameter D of the housing portion 12. This prevents interference between the stepped portion of the socket 10 and the object to be fastened when separating the tool 1 from the object to be fastened after the work is completed, and prevents the socket 10 from coming off the operating portion 20. A groove portion 311 is formed in the cylindrical body portion 31.

[0036] The groove 311 is formed in an annular shape on the outer surface of the cylindrical body 31. The groove 311 opens radially outward and is formed in a roughly U-shape in cross-section from the surface radially inward. The groove 311 is located near the front end of the cylindrical body 31. As a result, when the socket 10 is detached from the operating part 20, the socket 10 is supported at a position close to its center of gravity.

[0037] The extensions 32 are fitted into the main body 11. The extensions 32 are annular in shape and multiple extensions are provided arranged in the front-to-back direction X. The multiple extensions 32 are arranged at equal intervals from the front end to the rear end of the cylindrical main body 31. Each extension 32 has a notch in the circumferential direction, and is divided into four equal parts in the circumferential direction, for example. When the main body 11 is not fitted into the cylindrical body 30, the extensions 32 extend radially inward from the cylindrical main body 31, forming an opening 33.

[0038] The opening 33 is perpendicular to the front-rear direction X. The opening 33 is formed by the inner edge of the extension 32. The opening 33 is, for example, a circle centered on axis C. The diameter of the opening 33 is set to a diameter d2 which is smaller than the outer diameter d1 of the main body 11. As a result, the extension 32 forms an opening of diameter d2 when the main body 11 is not fitted into the cylindrical part 30, and forms an opening of diameter d1 when the main body 11 is fitted into the cylindrical part 30.

[0039] The connecting part 40 connects the operating part 20 (see Figure 1) and the cylindrical part 30. Specifically, the connecting part 40 connects the gripping string 23 (see Figure 1) and the cylindrical part 30. The gripping string 23 (operating part 20) corresponds to, for example, a "restraining part" for preventing the socket 10 from falling.

[0040] As shown in Figures 2 and 3, the connecting portion 40 has a rotating portion 41, a connecting member 42, and a hook 43.

[0041] The rotating part 41 is mounted on the cylindrical part 30. Specifically, the rotating part 41 is made of a metal ring and is mounted so as to be rotatable around the axis C of the cylindrical part 30. The rotating part 41 is also housed in the groove 311 so as not to fall out. The radius of the cross-section of the rotating part 41 is set to be less than or equal to the depth of the groove 311.

[0042] The connecting member 42 connects the rotating part 41 and the operating part 20 (see Figure 1). For example, the connecting member 42 is a string. One end of the connecting member 42 is connected to the rotating part 41, and the other end is connected to the hook 43.

[0043] The hook 43 connects the connecting member 42 and the gripping strap 23 (see Figure 1). However, the hook 43 is not limited to being connected to the gripping strap 23. The hook 43 may be connected to any part of the operating part 20 (see Figure 1) which corresponds to the restraining part. In addition, the hook 43 only needs to be connected to the restraining part, and may be connected to, for example, the user's clothing, equipment, lanyard, etc., which serve as the restraining part. A lanyard is a safety line used to prevent falls of workers at height.

[0044] With the above configuration, since the cylindrical portion 30 is connected to the gripping string 23 (operating portion 20), which is the restraining portion, via the connecting portion 40, even if the socket 10 comes off the operating portion 20, the socket 10 can be connected to the restraining portion via the cylindrical portion 30, thus preventing the socket 10 from falling. Furthermore, since the connecting portion 40 has a rotating portion 41 that is rotatable around the axis C of the cylindrical portion 30 and a connecting member 42 that connects the rotating portion 41 and the restraining portion, the rotating portion 41 can be connected to the restraining portion without changing the structure of the socket 10. Therefore, the manufacturing cost of the tool 1 can be reduced.

[0045] Furthermore, the cylindrical portion 30 may be constructed from an elastic material and have an opening 33 with a diameter d2 smaller than the outer diameter d1 of the main body portion 11. With the above configuration, the main body portion 11 of the socket 10 can be fitted into the opening 33 of the cylindrical portion 30 from the direction of axis C. By fitting the main body portion 11 of the socket 10 into the opening 33 of the cylindrical portion 30, the cylindrical portion 30 is fixed to the main body portion 11 of the socket 10 by its own elastic force, and the socket 10 and the cylindrical portion 30 can rotate synchronously.

[0046] Furthermore, the cylindrical portion 30 may have an extension portion 32 extending radially inward, and the extension portion 32 may also have an opening 33. With the above configuration, because it has an extension portion 32 extending radially inward, the socket 10 can be easily fitted into the opening 33 of the cylindrical portion 30, and it is difficult to pull the socket 10 out of the opening 33 of the cylindrical portion 30.

[0047] Furthermore, tool 1 may also be equipped with a fall prevention device 3. With the above configuration, it is possible to obtain tool 1 that prevents the socket 10 from falling while suppressing manufacturing costs.

[0048] <Embodiment 2> The fall prevention device 3A according to Embodiment 2 will be described with reference to Figures 5 and 6. Figure 5 is a diagram showing the socket 10 and fall prevention device 3A according to Embodiment 2. Figure 6 is a plan view of the socket 10 and fall prevention device 3A. Embodiment 2 differs from Embodiment 1 mainly in that it uses a locking portion 44, a first side portion 45, and a second side portion 46 instead of a string member that causes slack. The differences between Embodiment 2 and Embodiment 1 will be described below, and other descriptions of Embodiment 1 will be applied to Embodiment 2.

[0049] As shown in Figures 5 and 6, the fall prevention device 3A has a cylindrical portion 30 and a connecting portion 40A. The connecting portion 40A has a rotating portion 41 and a connecting member 42A.

[0050] The connecting member 42A has a locking portion 44, a first side portion 45, and a second side portion 46.

[0051] The locking portion 44 can be locked to the operating portion 20. The locking portion 44 is locked to the operating portion 20 when the socket 10 is attached to the operating portion 20. Specifically, the locking portion 44 is locked to the head 21. The locking portion 44 has a substantially spherical projection 441 in the center in the left-right direction Y. The projection 441 contacts the rear of the head 21 from the rear X2.

[0052] The first side portion 45 connects the rotating portion 41 and one end of the locking portion 44. Specifically, the first side portion 45 connects the right end of the rotating portion 41 and the right end of the locking portion 44. The first side portion 45 has a first biasing portion 451 in the middle.

[0053] The first biasing unit 451 biases the rotating unit 41 toward the rear X2. Specifically, when the locking unit 44 is locked to the operating unit 20, the first biasing unit 451 biases the rotating unit 41 toward the operating unit 20. The first biasing unit 451 is, for example, a compression spring.

[0054] The second side portion 46 connects the rotating portion 41 and the other end of the locking portion 44. Specifically, the second side portion 46 connects the left end of the rotating portion 41 and the left end of the locking portion 44. The second side portion 46 has a second biasing portion 461 in the middle.

[0055] The second biasing unit 461 biases the rotating unit 41 toward the rear X2. Specifically, when the locking unit 44 is locked to the operating unit 20, the second biasing unit 461 biases the rotating unit 41 toward the operating unit 20. The second biasing unit 461 is, for example, a compression spring.

[0056] When attaching the connecting part 40A to the operating part 20, as shown by the dashed line in Figure 5, after attaching the socket 10 (insertion square 111) to the head 21 (output shaft 211), the locking part 44 is moved X2 behind the head 21 to extend the first biasing part 451 and the second biasing part 461. Next, the locking part 44 is moved from above Z1 to below Z2 of the head 21 to lock it to the rear of the head 21. Note that the length of the first side part 45 and the second side part 46 in the front-rear direction X when the first biasing part 451 and the second biasing part 461 are not extended is shorter than the length of the front-rear direction X from the rotating part 41 to the rear of the head 21.

[0057] With the above configuration, the first side portion 45 has a first biasing portion 451 that biases the rotating portion 41 toward the operating portion 20 when the locking portion 44 is locked to the operating portion 20, and the second side portion 46 has a second biasing portion 461 that biases the rotating portion 41 toward the operating portion 20 when the locking portion 44 is locked to the operating portion 20, thereby preventing the socket 10 from coming loose. As a result, the socket 10 can be prevented from falling. In this embodiment, the occurrence of looseness in the connecting member between the socket 10 and the operating portion 20 can be suppressed. Note that both the connecting member 42 and the connecting member 42A may be connected to the rotating portion 41.

[0058] <Embodiment 3> The fall prevention device 3B according to Embodiment 3 will be described with reference to Figures 7 and 8. Figure 7 is a diagram showing a modified example of the socket 10 and fall prevention device 3B according to Embodiment 3. Figure 8 is a cross-sectional view taken along line VIII-VIII in Figure 7. Embodiment 3 differs from Embodiment 1 mainly in that the extension portion 32 is omitted and the cylindrical main body portion 31 extends in the circumferential direction and contacts the main body portion 11. The differences between Embodiment 3 and Embodiment 1 will be described below, and other descriptions of Embodiment 1 will be applied to Embodiment 3.

[0059] As shown in Figures 7 and 8, the fall prevention device 3B has a cylindrical portion 30B and a connecting portion 40.

[0060] The cylindrical portion 30B is fixed to the main body portion 11. The cylindrical portion 30B is made of an elastic material, such as silicone rubber, and is shaped like a cylinder. The cylindrical portion 30B is detachably attached to the main body portion 11 of the socket 10. The cylindrical portion 30B has a cylindrical main body portion 31 and a protruding portion 34.

[0061] The cylindrical body portion 31 forms the inner circumference of the cylindrical portion 30B. The cylindrical body portion 31 covers the outer surface of the body portion 11 from the front end to the rear end. The cylindrical body portion 31 is fitted into the body portion 11.

[0062] The protrusions 34 project radially outward from the surface of the cylindrical main body 31. Multiple protrusions 34 are provided in the circumferential direction and extend in the front-rear direction X along the axis C. Grooves 311 extending in the circumferential direction are formed on the surface of each of the multiple protrusions 34.

[0063] When fitting the main body portion 11 into the cylindrical portion 30B, the portion of the cylindrical main body portion 31 where the protruding portion 34 is not located is extended circumferentially and fitted into the main body portion 11. This increases the contact area between the main body portion 11 and the cylindrical main body portion 31, thereby improving the connectivity between the socket 10 and the cylindrical portion 30B. In addition, the contact area between the rotating portion 41 and the groove portion 311 is reduced, thereby reducing friction between the rotating portion 41 and the cylindrical main body portion 31 and enabling smooth sliding. Note that the inner diameter of the cylindrical main body portion 31 is smaller than the outer diameter d1 of the main body portion 11.

[0064] Embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the embodiments described above, and can be implemented in various forms without departing from the spirit of the invention. The drawings sometimes schematically show the components in order to facilitate understanding. The number of each component shown in the drawings may differ from the actual number due to the convenience of drawing creation. Furthermore, the components shown in the above embodiments are examples and are not particularly limiting, and various modifications are possible without substantially departing from the effects of the present invention.

[0065] (1) In this embodiment, tool 1 was a ratchet wrench among socket wrenches, but the disclosure is not limited thereto. Tool 1 may be a torque wrench. Also, tool 1 is not limited to a manual tool. Tool 1 is applicable to tools that can select multiple types of sockets as adapters, may be applied to an impact driver which is a power tool, and is applicable to various power tools.

[0066] (2) In this embodiment, the socket 10 was a hexagonal socket having a hexagonal hole, but the disclosure is not limited thereto. The socket 10 may be a dodecagonal socket having a dodecagonal hole.

[0067] (3) In this embodiment, the cylindrical portion 30 was made of silicone rubber, but the disclosure is not limited thereto. The cylindrical portion 30 only needs to have at least predetermined elastic properties, and can be selected from urethane rubber, fluororubber, etc., as appropriate according to the specifications.

[0068] (4) In this embodiment, the rotating part 41, which is made of a ring, is placed in the groove 311 which opens radially outward, but the disclosure is not limited thereto. The configuration of the rotating part and the groove may be changed to make the rotating part smaller. In this case, the rotating part is made up of a small piece-shaped base and a boss part that extends radially outward from the base. The shape of the base is not ring-shaped, but plate-shaped or block-shaped. The groove has a cover that closes a recess on the radially outward side of the groove so that the base does not come off radially outward. The cover has a circular slit that the boss part can be inserted through. The groove is formed in a substantially C-shape in cross-section, so that the base can move in the circumferential direction along the groove and the movement of the base radially outward is restricted. This makes it possible to make the rotating part smaller while allowing movement around axis C by the rotating part. [Explanation of Symbols]

[0069] 1...Tool, 3, 3A, 3B...Fall prevention device, 10...Socket, 11...Main body, 20...Operating part, 22...Handle, 30, 30B...Cylindrical part, 31...Cylindrical main body, 32...Extension part, 33...Opening, 40, 40A...Connecting part, 41...Rotating part, 42, 42A...Connecting member, 44...Locking part

Claims

1. A fall prevention device for a socket relating to a tool having a rotaryly driven socket and an operating part that allows the socket to be attached and detached, A cylindrical portion configured to be tubular into which the aforementioned socket can be inserted, and which rotates in sync with the aforementioned socket, A restraining part for preventing the socket from falling and a connecting part for connecting the cylindrical part. Equipped with, The aforementioned connecting portion is A rotating part is provided so as to be rotatable around the axis of the cylindrical part, A connecting member that connects the rotating part and the restraining part. A fall prevention device having the following features.

2. The socket has a main body that is connected to the operating unit, The fall prevention device according to claim 1, wherein the cylindrical portion is made of an elastic material and has an opening with a diameter smaller than the outer diameter of the main body.

3. The cylindrical portion has an extension that extends radially inward, The extension portion forms the opening, as described in claim 2.

4. The aforementioned connecting member is When the socket is attached to the operating unit, it has a locking portion that can be locked to the operating unit, A first side portion connecting the rotating portion and one end of the locking portion, A second side portion connecting the rotating portion and the other end of the locking portion. It has, The first side portion has a first biasing portion that biases the rotating portion toward the operating portion when the locking portion is locked to the operating portion, The fall prevention device according to any one of claims 1 to 3, wherein the second side portion has a second biasing portion that biases the rotating portion toward the operating portion when the locking portion is locked to the operating portion.

5. A tool comprising a fall prevention device according to any one of claims 1 to 3.

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