JP3117827U - Screw dropout prevention tool and screwdriver equipped with the screw dropout prevention tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screw drop prevention tool and a screw driver with a screw drop prevention tool for preventing a screw from dropping when a screw is removed or attached.
A screw drop prevention tool for a driver, a cylindrical member 3 fitted on an outer periphery of a shaft portion 1 of a driver 10, and a distal end of the cylindrical member 2 fitted and bent. A plurality of arms 4 provided with the claws 7 and a holding force adjusting member 3 that slides the outer periphery of the arms 4 in the axial direction to open and close the tips of the claws 7.
[Selection] Figure 1

Description

  The present invention relates to a screw drop prevention tool for a driver that can prevent a screw from falling off by gripping the screw when the screw is attached or detached, and a driver equipped with the screw drop prevention tool.

  A screw drop prevention tool for a driver and a first conventional example of a driver using the screw drop prevention tool will be described with reference to FIG. 6 (Patent Document 1). The screw drop-off prevention tool includes two or more claws 11a arranged in the circumferential direction for holding the bolt 15 fixedly held to the tool 16 by sandwiching the outer periphery of the head 15b or neck of the bolt 15 with the arrow C of the bolt 15. Alternatively, it can be easily inserted and removed in the D direction, and can be moved in the direction of the arrow C or D relative to the tool 16 integrally with the elastic arm 11b for securely fixing the bolt 15. In addition, the main body 11C has a means for restricting the movement, and means 12 for restricting the movement of the holding tool 11 such as a bolt or a child screw in the direction of arrow D with respect to the tool 16.

  FIG. 7 is a diagram for explaining a second conventional example (Patent Document 2). The screwdriver 21 has a shaft 22 a and a holder 22. The holder 22 has a claw 27 for holding a screw head. The coil spring 23 biases the holder 22 in the distal direction, and a nut 24 holds the holder 22. The screw 22 is locked to the shaft 21a and removed from the fastening member is supported by the claw 27 at the tip of the holder 22 and held.

FIG. 8 is a diagram for explaining a third conventional example (Patent Document 3). This is a screw chuck structure. This screw chuck forms a tapered surface 35 at the tip of the inner cylinder 32, and the outer cylinder 34 is disposed in a petal shape when viewed from the axial direction. In addition, a plurality of screw head gripping pieces 43 whose inner ends are locked to the screw head are formed, and a knob 45 is formed by projecting the base of the inner cylinder 32 toward the base end side of the outer cylinder 34. Then, a through-hole 41 in the radial direction is provided in the peripheral wall of the inner cylindrical body 32, and a locking sphere 37 that slightly protrudes inward and engages with the concave portion 38 of the bit 31 is inserted into the through-hole 41, and the intermediate cylindrical body is inserted. A protruding portion 33a that protrudes from the locking sphere 37 is provided on the inner peripheral surface of the locking sphere 37 in contact with or close to the locking sphere 37 and retracted from the locking sphere 37 in a state in which the intermediate cylinder 33 is slid to the distal end side. The point is the structure.
Utility Model Registration No. 3040148 Japanese Utility Model Publication No. 5-44469 Utility Model Registration No. 3029060

  In the first conventional example shown in FIG. 6, in order to firmly fix the screw drop prevention tool to the bolt 15, it is necessary to tighten the bolt 13, which is troublesome and inconvenient. Further, the claw 11a holds the screw only by the elastic force of the arm 11b, and since there is no mechanism for pressing the arm 11b or the claw 11a from the outside, the screw cannot be stably held. There was also a drawback that it was easy to drop off.

  In the second conventional example shown in FIG. 7, similarly to the first conventional example, the holder 22 provided with the claw 27 for holding the screw only holds the screw by an autonomous force utilizing its elastic force. Since there is no structure for holding the holder 22, the screw cannot be gripped stably, and there is a drawback in that the screw is detached and easily falls off.

  Since the third conventional example shown in FIG. 8 does not have a structure for pushing the holder 43, it has the same disadvantage as the above conventional example that the screw cannot be stably gripped, and the structure is extremely complicated. However, it has the disadvantage that it takes time, is expensive and is not economical. In other words, none of the conventional examples have a structure for pressing the claw for holding the screw or screw from the outside, so that the claw cannot stably hold the screw, and the screw is easily detached. Had.

  The screw drop-off prevention device of the present invention includes a cylindrical member that is fitted to the outer periphery of the shaft portion of the driver, and an arm that is fitted to the outer periphery of the cylindrical member and includes a plurality of claws whose arms are bent. The holding force adjusting member is configured to slide the outer periphery of the arm in the axial direction to open and close the tip of the claw.

  As described above, according to the screw drop prevention device of the present invention, the holding force adjusting member that presses the arm from the outside of the arm that grips the screw is provided, and this can be slid to grip the screw with an appropriate force. Since the new structure is used, it is possible to reliably prevent the screws from falling off. Further, since the structure of the holding force adjusting member is simple, it is easy to manufacture, and is inexpensive and excellent in economic efficiency. Furthermore, since the cylindrical member and the holding force adjusting member can be made of an insulating material, it can be used for hot-wire work such as attachment and removal of the power line, which was difficult with a conventional type driver, The range of use of the driver can also be expanded.

  FIG. 1 is a diagram showing the overall structure of the driver of the present invention. FIG. 1A shows a conventional screwdriver in which the part of the screw drop prevention device that is the subject of the present invention is not attached, and FIG. 1B shows that the screw drop prevention tool of the present invention is attached to the shaft portion 1 of the driver 10. FIG. 1 (c) shows a state in which the tip of the shaft portion 1 of the driver 10 is hidden, and the tip of the shaft portion 1 of the driver 10 is pointed into the screw groove of the screw while holding the screw with a plurality of claws. The state of the driver when rotating is shown (screw figure is omitted).

  In FIGS. 1A to 1C, 10 is a driver, 1 is a shaft portion of the driver 10, 2 is a cylindrical member fitted to the shaft portion 1 of the driver 10, 7 is a claw for gripping a screw, 4 Is an arm that is fitted on the outer periphery of this cylindrical member and has a claw 7 at its tip. 3 is a holder that slides the outer periphery of the arm 4 in the axial direction to open and close the tip of the claw 7 and adjust the holding force of the gripped screw. It is a force adjusting member and is a characteristic part of the present invention. The cylindrical member 2 is configured to be slidable back and forth, and the tip of the shaft 1 of the driver 10 is hidden when slid forward, and the tip of the shaft 1 of the driver 10 is exposed when slid backward. In this way, the cylindrical member 2 can be slid back and forth so that the tip of the shaft 1 of the driver 10 is exposed only when the driver is used, and the tip of the shaft 1 of the driver 10 is hidden when not in use. By doing so, it is possible to prevent the human body from being damaged at the tip of the shaft portion 1 of the driver 10 due to an accident or the like. FIG. 1B shows a state in which the cylindrical member 2 is slid forward and the tip of the shaft portion 1 of the driver 10 is hidden. When the driver of the present invention is used, the cylindrical member 2 is slid rearward so that the tip of the shaft portion 1 of the driver 10 is inserted into the screw groove of the screw and the screw is gripped by the plurality of claws 7 to hold the holding force adjusting member 3. Is set at an appropriate position to hold the screw with an appropriate force, and FIG. 1 (c) shows the state of the driver when performing such an operation. The material of the cylindrical member 2 is not particularly limited, but if an insulator such as vinyl chloride is used, an insulating driver can be obtained, so that it can be used for live-line work such as attachment and removal of the power supply line, which is more convenient. .

  The arm 4 having the claw 7 for gripping the screw is made of a soft material that can be bent, and it is desirable to arrange the plurality of arms 4 along the circumference, for example, in a petal shape. Of course, the arrangement of the arm 4 is not limited to the petal shape, and can be arranged in various shapes. The number of arms 4 is not limited, but it is desirable to provide a large number of claws in order to hold the screws in a balanced and reliable manner. However, considering the ease of manufacturing, it is preferable to set the number of arms to about 8, for example. It is. The material of the arm 4 is not particularly limited as long as it is durable and elastic, but an inexpensive and insulating material is desirable, and nylon is preferable.

  The holding force adjusting member 3, which is a feature of the present invention, is a structure that is slidable back and forth and is provided outside the arm 4 to cover the arm 4 from the outside, and adjusts the degree of covering the arm 4 while sliding back and forth. Thus, the holding force of the arm 4 holding the screw can be adjusted. That is, when the holding force adjusting member 3 is slid rearward, the force for pressing the arm 4 is weakened, so that each claw 7 of the arm 4 can be opened outward, and each open claw 7 holds the screw. After that, the screw can be gripped with an appropriate force by sliding the holding force adjusting member 3 forward by an appropriate amount and pressing the arm 4 from the outside.

  2A is an enlarged cross-sectional view of the screw drop-off prevention device, FIG. 2B is an external view of the tip portion thereof, and FIG. 2C is a tip side direction (the direction indicated by the arrow in FIG. 2B). It is the figure which looked at the driver side from. The same parts as those in FIG. Reference numeral 6 denotes a screw attached or removed by the screwdriver of the present invention, 6A denotes a neck portion of the screw, and 6B denotes a head portion of the screw. The screws 6 are held by the claws 7 at the tips of the plurality of arms 4, and the arms 4 are pressed from the outside of the arms 4 by the holding force adjusting member 3 which is a feature of the present invention to hold the screws 6 with an appropriate force. It is intended to prevent the falling off.

  FIG. 3 is an enlarged view of a portion of the O-ring 5 for adjusting the inner diameter. When an O-ring 5 provided between the cylindrical member 2 and the screwed joint 8 is inserted and the joint 8 is screwed in, the O-ring 5 is crushed and the inner diameter of the O-ring 5 is reduced. Can be fixed to the shaft portion 1 of the driver 10.

  4A is an enlarged cross-sectional view of the screw drop-off prevention device, FIG. 4B is an external view of the tip portion thereof, and FIG. 4C is a tip side direction (the direction indicated by the arrow in FIG. 4B). It is the figure which looked at the driver side from. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. Reference numeral 5 denotes an O-ring for adjusting the inner diameter. The detailed structure of the O-ring part is shown in FIG. 3 and will be described later. The shaft portion 1 of the driver 10 can move back and forth (left and right in the drawing) inside the cylindrical member 2. The arm 4 has a plurality of claws 7 at the tip thereof, and each claw 7 is substantially evenly distributed along the outer circumference of the cylindrical member 2 as shown in FIGS. Etc. are provided. Although the number of claws 7 is not limited, the example in the figure is an example using eight claws 7. An appropriate number of claws 7 may be selected in consideration of necessary holding force and manufacturability. The feature of the present invention is that the holding force adjusting member 3 is provided outside the arm 4. The holding force adjusting member 3 has a structure that can slide back and forth, and may be made of any material, but it is preferable to use an insulating material like the cylindrical member 2.

  FIG. 5 is a view showing in detail a process of gripping a screw using an enlarged cross-sectional view of the driver of the present invention. In FIG. 5, the same parts as those in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof is omitted. FIG. 5A shows a state immediately before the tip of the shaft portion 1 of the driver 1 is hidden in the cylindrical member 2 by sliding the cylindrical member 2 forward and the screw 6 is gripped by the claw 7. FIG. 5B shows a state in which the holding force adjusting member 3 is slid rearward, the arm 4 is opened outward, and the head 6B of the screw 6 is started to be gripped by the claw 7. 5 (c), the claw 7 is moved to the neck 6A between the head 6B of the screw 6 and the spring washer, the holding force adjusting member 3 is slid forward by an appropriate amount, and the screw 1 is firmly gripped. The state where the tip of the driver 1 is approaching the screw 6 by moving forward is shown. FIG. 5D shows a state in which the tip of the driver 1 is inserted into the screw groove of the screw 6. When attaching a screw, the screw can be attached by inserting the screw into the screw groove in this state and rotating the screw in the forward direction. When removing the screw, the screw 6 can be loosened and removed by rotating the tip of the shaft 1 of the driver 1 in the reverse direction.

Next, a procedure for attaching and removing a screw using the screwdriver of the present invention will be described.
When attaching a screw, first, the entire cylindrical member is slid forward by sliding the cylindrical member forward. Next, the screw to be attached is grasped by the nail 7 while the holding force adjusting member is slid back and forth to adjust the opening degree of the nail 7. Next, the tip of the shaft portion 1 of the driver 10 is advanced while slowly sliding the cylindrical member backward, and the tip of the shaft portion 1 of the driver 10 is inserted into the screw groove (+ or −) of the screw. When it is confirmed that it is correctly pointed, the tip of the shaft portion 1 of the driver 10 is screwed into the screw groove and the driver is rotated.

  When removing the screw, first, the cylindrical member is slid rearward to slide the entire screw drop prevention tool backward to expose the tip of the shaft portion 1 of the driver 10. Next, the tip of the shaft portion 1 of the screwdriver 10 is inserted into the screw thread groove, and the screwdriver is rotated to loosen it slightly to the extent that the screw does not come off. Next, the cylindrical member is slid forward as it is, the tip of the shaft portion 1 of the driver 10 is once moved away from the screw, and the holding force adjusting member is slid back and forth to adjust the opening degree of the arm 4 to the screw. The claw 7 is pressed to grip the screw. Next, if the screwdriver is pushed out, the tip of the shaft portion 1 of the screwdriver 10 is pointed into the screw groove of the screw and the screwdriver is rotated in the reverse direction, the screw can be removed while being gripped by the screw drop prevention tool. Can be prevented from falling off.

It is the external appearance of the driver of this invention, and a screw fall-off prevention tool. This is a driver of the present invention in a state where the tip of the shaft portion 1 of the driver 10 is pointed into a screw thread groove. It is the structure of the O-ring part for adjusting the inner diameter of the driver of the present invention. This is a driver of the present invention in which the tip of the shaft portion 1 of the driver 10 is hidden. It is a figure showing the process until it points in the screw slot of a screw of the present invention. It is a 1st example of the conventional driver. It is a 2nd example of the conventional driver. It is a 3rd example of the conventional driver.

Explanation of symbols

1 Shaft 2 Cylindrical member 3 Holding force adjusting member 4 Arm 5 O-ring for adjusting inner diameter 6 Screw 7 Claw 10 Driver

Claims (6)

A cylindrical member fitted on the outer periphery of the shaft portion of the driver;
An arm having a plurality of claws that are fitted to the outer periphery of the cylindrical member and bent at the tip of the arm;
A screw drop prevention tool comprising: a holding force adjusting member that slides the outer periphery of the arm in the axial direction to open and close the tip of the claw.   The screw drop-off preventing device according to claim 1, wherein the cylindrical member is made of an insulating material.   The screw drop prevention tool according to claim 2, wherein the insulating material is vinyl chloride.   The screw drop-off preventing device according to claim 1, wherein the arm is made of nylon.   The screw drop prevention tool according to any one of claims 1 to 4, further comprising an inner diameter adjusting O-ring. 6. A screwdriver, wherein the screw drop-off prevention device according to claim 1 is movably mounted on a shaft portion.

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