JP2009291926A - Machine screw falling-off preventing holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a machine screw falling-off preventing holder not only for allowing the mounting of a machine screw and a washer into a screw hole with single-hand work of gripping a screwdriver but also for allowing the demounting of the machine screw and the washer simply with the single-hand operation of the screwdriver without retaining the machine screw by the other hand while avoiding the fall-off and lost of the machine screw. <P>SOLUTION: The machine screw falling-off preventing holder 1 is used for mounting/demounting the machine screw 20 into/from the screw hole 32 provided in a mounted face 31 while using the screwdriver. It includes a base plate 2 having a hole 2a for a screw portion 20a of the machine screw to be inserted therethrough, and a plurality of clamping pieces 5 rising from the outer peripheral edge of the base plate. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  In the present invention, when a screw is attached to or detached from a screw hole provided in a terminal block or the like by a screwdriver, it is possible to eliminate a problem that a screw or a washer drops and contacts a peripheral electrode to cause a short circuit or dissipate. The present invention relates to a screw drop-off prevention holder.

When connecting the conductor part of the cable by screwing the screw through the washer to the screw hole provided in the terminal block provided on the switchboard or the terminal block provided in various devices, or removing the screw and washer from the screw hole A manual operation using a driver is performed. When attaching the screw, hold the screw with the fingertip of one hand and keep the tip of the male screw in contact with the screw hole. Perform wearing work. On the other hand, when removing the screw, the screw is loosened with a screwdriver and pulled out from the screw hole, and then the screw is picked up by the fingertip of the other hand. Further, when attaching the screw, it is necessary to hold the cable with one hand so that the cable connected to the terminal block does not get caught in the surrounding terminals and members, which requires labor and skill.
In addition, when attaching and detaching screws using a screwdriver, screws and washers often fall and come into contact with surrounding electrodes or dissipate.
There are also known drivers that prevent the screw from falling by magnetizing the tip and adhering the screw head, but there are individual differences in ease of use and the screw head can be adsorbed sufficiently. There are many cases of falling. In particular, when a washer is used in combination, even the washer cannot be adsorbed by the tip of the driver. Therefore, it has been necessary to keep the washer held with a finger of one hand so as not to fall off from the screw. Even when removing the screw and washer, the washer is likely to fall off from the screw, so that sufficient care must be taken.
In particular, the smaller the size of the screw, the more difficult it is to manually attach and remove the screw and washer, and the screw and washer are dissipated, or the dissipated screw and washer are in contact with the conductor portion of the electrical circuit nearby. In many cases, short-circuiting occurs.

In Japanese Patent Application Laid-Open No. 07-1352 “Screw with tube”, a cylindrical tube having a cut at the tip is attached so as to surround the metal rod portion of the driver, and the screw is attached to the tip of the driver by the elasticity of the tip of the tube. It is disclosed that, by pressing, it is possible to attach and detach the screw without pressing the screw by hand.
However, in this conventional example, the tube tip protruding beyond the driver tip becomes an obstacle, and it is difficult to screw the screw into the screw hole. Moreover, when using a washer together, it is unclear whether or not the washer can be held by the tube. Further, when removing a screw in a screwed state, there is a problem that dissipation cannot be prevented unless the screw and the washer are kept pressed with one hand.
Japanese Laid-Open Patent Publication No. 2001-1275 discloses a screwdriver set in which a screw or washer is held in a distal end opening of a cylindrical screw holder made of a soft resin that is slidably fitted to an outer surface of a metal rod portion of a driver. On the other hand, it is disclosed that the screw can be screwed only by operating the driver held by one hand by bringing the screw head into contact with the driver tip.
However, even in this conventional example, when removing the screw in the screwed state, there is a problem that dissipation cannot be prevented unless the screw and the washer are continuously pressed with one hand.
Japanese Patent Laid-Open No. 11-333745 discloses a configuration in which a drop prevention mechanism is arranged on the driver side, and Japanese Patent Laid-Open No. 2000-141239 discloses a configuration in which means for collecting the removed screw is provided on the driver side. However, in either case, it is necessary to process the driver, and the structure becomes complicated, so that there is a problem that the existing driver cannot be used as it is.
Japanese Patent Application Laid-Open No. 07-1352 JP 2001-1275 A JP 11-333745 A JP 2000-141239 A

In order to improve the workability of screwing the screw into the screw hole by the driver, means for holding the screw head in contact with the tip of the driver has been proposed, but there is a problem in workability at the time of screwing. When using a screwdriver to remove the screws and washers, there is a problem that the screws are easily dissipated unless they are pressed with the other hand.
The present invention has been made in view of the above circumstances, and not only can a screw and a washer be attached to a screw hole by one hand holding a driver, but also when removing a screw and a washer, An object of the present invention is to provide a screw drop-off prevention holder that can be removed without dropping or dissipating a screw or the like by operating the driver with one hand without holding it with a hand.

In order to achieve the above object, a screw drop prevention holder according to the invention of claim 1 is a screw drop prevention holder used when a screw is attached to and detached from a screw hole provided on a mounting surface using a screwdriver. A base plate having a hole through which the screw portion of the screw is inserted, and a plurality of pressing pieces rising from an outer peripheral edge of the base plate are provided.
Since it has a base plate with a hole through which the screw part of the screw is inserted and a clamping piece that is held by the metal rod part of the driver, the screwdriver with the screw part inserted into the hole of the holder The state in which the tip is brought into contact with the screw head can be maintained, and the screw can be screwed into the mounting hole by a driver grasped with one hand. The material of the holder can be made of metal, resin, or the like.
According to a second aspect of the present invention, in the screw drop-off prevention holder according to the first aspect, the base plate is a spring washer having a notch extending in a radial direction.
By using the base plate itself as a spring washer, the use of the spring washer can be omitted and the mounting strength can be increased.
The screw drop-off prevention holder according to the invention of claim 3 is characterized in that, in claim 1 or 2, the holder is made of a conductive material.
By using the conductive material, it is possible to measure the current or the like by attaching a hook clip or the like to the pinching piece using the tip.
According to a fourth aspect of the present invention, there is provided the screw drop-off prevention holder according to any one of the first to third aspects, wherein a locked portion suitable for locking by a hook clip is provided at the tip of the pinching piece of the holder. It is characterized by that.

As described above, according to the present invention, not only can the screw be attached to the screw hole by one hand holding the driver, but also when the screw is removed, the driver can be operated with one hand without holding the screw by hand. You can remove the screws without dropping or dissipating them.
When attaching the screw and washer to the screw hole with a screwdriver, set the screw and washer on the base that constitutes the holder, and then contact the screw tip with the screw hole and tighten it with the screwdriver. Is prevented. Similarly, when the screws are removed, the dissipation of screws and the like is prevented.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
1A to 1D are a front view, an external perspective view, a plan view, and a cross-sectional view taken along line AA of a screw drop prevention holder according to an embodiment of the present invention, and FIG. It is sectional drawing shown.
The screw drop-off prevention holder (hereinafter referred to as the holder) 1 of the present invention is screwed into the screw hole 32 provided in the mounting surface 31 of the terminal block 30 shown in FIG. Or, when the screw 20 screwed is removed, the screw 20 is used in a state assembled to the screw 20 in advance. When the washer 21 is used together with the screw 20, the screw is fastened with the washer 21 interposed between the bottom surface of the holder 1 and the mounting surface 31, as shown in FIG. As shown, a washer 21 is placed in the holder.

The holder 1 is a screw drop-off prevention means that is used in a state where it is pre-assembled on the screw 20 side when the screw 20 is attached to and detached from the screw hole 32 provided in the mounting surface 31 using the screwdriver 40. A base plate 2 having a hole 2a through which the portion 20a is inserted, and a plurality of pinching pieces 5 erected from the outer peripheral edge of the base plate 2 are provided.
The holder 1 is integrally formed of a metal plate material such as stainless steel or aluminum, or a hard plastic, and in this example, the base plate 2 is circular, but in any shape such as a polygon such as a triangle or a rectangle. There may be. The pinching pieces 5 have base ends connected to the outer periphery of the base plate 2 at a predetermined pitch. By standing up at a required angle, the pressing pieces 5 are evenly connected to the metal rod portion 41 of the driver at each tip portion (locked portion) 5a. The distance between the tip portions 5a and the positional relationship are set so that they can be pressed against each other. The shape, width, and number of the pressing pieces 5 are arbitrary. In the illustrated configuration of the holder 1, each pressing piece 5 is inclined upward from the outer peripheral edge of the base plate 2 toward the inner diameter side, but may be erected vertically. Moreover, although the pinching piece 5 which concerns on this example is a strip | belt shape with a fixed width | variety, the taper shape which a width | variety reduces gradually as it goes upwards may be sufficient. In short, any configuration may be used as long as the metal rod portion of the driver can be held by the pressing pieces.

In the case where the screw 20 is screwed into the screw hole 32 by the driver 40 while holding the screw 20 using the holder 1, the screw 20 a is inserted into the hole 2 a of the base plate 2. The metal rod portion 41 of the driver is inserted into the insertion hole formed between the pieces 5, and the tip of the metal rod portion is placed in the groove portion of the screw head. At this time, the metal rod portion 41 of the driver is prevented from falling off from the pinching piece by the pinching force of the pinching piece 5, and can maintain a contact state with the screw head. That is, since the metal bar portion 41 is in a state of being pinched by the spring force between the tip portions of the plurality of pinching pieces, even if the driver is lifted, the holder does not fall from the driver due to the weight of the holder 1. .
Next, by operating the screwdriver held by one hand, the screw portion 20a is screwed into the screw hole 32 only by rotating the driver while the tip of the screw screw portion 20a is applied to the hole 2a of the holder.
During this screwing operation, the holder 1 does not fall off or slip off from the screwdriver held by one hand, so that the screw and washer together with the holder are securely attached to the terminal block mounting surface 31 without dropping or dissipating the screw. Can be attached to. At this time, since a cable (not shown) connected to the screw can be gripped with a free hand and operated so as not to be caught, operability is improved. Moreover, what is necessary is just to extract a driver from between pinching pieces after completion of attachment work.

In the embodiment of FIG. 2, the washer 21 is disposed on the lower surface side of the base plate 2 of the holder and held between the mounting surface 31. However, as shown in FIG. A washer 21 may be disposed on the upper surface side.
2 and 3, since the partition plate 33 is erected around the mounting surface 31 of the terminal block 30, there is no problem even if the holder 1 remains on the mounting surface after the screws are mounted. Does not occur. Rather, when the holder 1 is made of a conductor, it is easy to attach a notch clip (not shown) using the holder pressing piece 5 fixed to the attachment surface, so that current, voltage, signal, etc. can be measured. The structure is suitable for measuring with a measuring instrument. Therefore, by folding the front end portion (locked portion) 5a of the pinching piece 5 outward as shown in the drawing, not only the driver can be easily inserted and removed, but also the hook clip can be easily hooked. The shape of the front end portion (locked portion) of the pinching piece 5 may be any shape as long as it is suitable for locking by the hook clip.
If the pressing piece 5 protrudes when the screw and the washer are fixed to the terminal block together with the holder 1, there is a possibility that an accident may occur in which a human body or a jig comes into contact with the pressing piece 5. Such a problem can be solved if an insulating cap (not shown) is detachably attached or fixedly covered.

As shown in FIG. 2, when removing the screw 20 that is screwed to the terminal block 30, the driver 40 gripped with one hand is inserted into the space formed between the pinching pieces 5 and the tip of the driver is inserted. By rotating the screw in the groove of the screw head, the screw can be detached together with the holder 1, and the screw can be prevented from dropping. When both the screw and the washer are held in the holder as shown in FIG. 3, there is no possibility that they will fall or scatter.
At the time of attaching / detaching the screw, the removing operation can be advanced while operating a cable (not shown) connected to the screw by the other hand, so that workability is improved.
Even when the diameter of the metal rod portion of the driver to be used is different, the pressing piece 5 is elastically opened and closed, so that various drivers can be applied.
Depending on the material of the holder 1, it may be difficult to ensure a sufficient clamping force by the clamping piece 5. In such a case, as shown in FIG. 4, a fastening member made of a metal wire or the like or a linear spring material 6 is wound around the constriction at the tip of each clamping piece 5 to secure the clamping pressure on the driver. It may be left.

Next, FIGS. 5A and 5B are a perspective view and a bottom view of a holder according to a modification of the present invention.
The holder 1 is characterized in that the base plate 2 is configured as a spring washer and the pressing piece 5 is erected from the outer periphery of the base plate 2.
As is well known, the spring washer has a disk shape with a hole in the center, and has a spring property by forming a cut 2b in which a part of the outer periphery is cut in the radial direction. The feature of the present invention is that this structure is applied to the base plate 2 as it is.
According to this, without requiring a special spring washer, the screw portion of the screw inserted into the hole 2a of the base plate is inserted into the screw hole of the mounting surface and screwed by the screwdriver, so that the effect of the spring washer is strong. The fastening state can be maintained.
In addition, the holder of the present invention is characterized in that it can be used repeatedly, but if repeated use is not necessary, the clamping piece 5 may be cut off from the base plate after screwing.
Moreover, it is not necessary to modify the driver, and an existing driver can be used, which is convenient.

(A) thru | or (d) are the front view, external appearance perspective view, top view, and AA sectional drawing of the drop-off prevention holder of the screw which concerns on one Embodiment of this invention. It is sectional drawing which shows the attachment state by a driver. It is explanatory drawing of other embodiment. It is a structure explanatory view of the holder concerning other embodiments. (A) And (b) is the longitudinal cross-sectional view and bottom view of the holder which concern on the modification of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drop-off prevention holder, 2 base plate, 2a hole, 2b cut line, 5 pinching piece, 5a tip part, 6 linear spring material, 20 screws, 20a screw part, 21 washer, 30 terminal block, 31 mounting surface, 32 Screw hole, 40 screwdriver, 41 metal bar

Claims (4)

A screw drop-off prevention holder used when attaching / detaching a screw with a screwdriver in a screw hole provided on the mounting surface,
A screw drop prevention holder comprising: a base plate having a hole through which the screw portion of the screw is inserted; and a plurality of pinching pieces erected from an outer peripheral edge of the base plate.   The screw drop-off prevention holder according to claim 1, wherein the base plate is a spring washer having a cut extending in a radial direction.   The screw drop-off prevention holder according to claim 1 or 2, wherein the holder is made of a conductive material.   The screw drop-off prevention holder according to any one of claims 1 to 3, wherein a locked portion suitable for locking by a hook clip is provided at a tip portion of the pinching piece of the holder.

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