JP5062691B2 - Screw fall prevention tool - Google Patents

Description

  The present invention relates to a screw drop prevention tool for preventing a screw from falling off when switching the voltage of a single-phase three-wire distribution board.

  As described in Patent Document 1, for example, a single-phase three-wire distribution board has one end of a switching branch bar connected to a branch breaker, and the other end of the switching branch bar is connected to a neutral pole main bar or a voltage pole main trunk. The voltage can be switched by selectively connecting to the bar. To switch the voltage, loosen the power supply side terminal of the branch breaker to which one end of the switching branch bar is connected, and rotate the other end of the switching branch bar around the other end with the screw for fixing to the main bar removed. The main bar of the sex electrode or the main bar of the voltage electrode, and the other end of the switching branch bar is in contact with one of the main bars, and a screw is inserted into the through hole formed at the other end of the switching branch bar. It was done by inserting and tightening and fixing to the screw holes formed in the main bar.

JP 2002-165316 A

  Thus, since the screw is completely removed in the voltage switching operation, the screw may be dropped. Usually, since the distribution board is installed at a high place near the ceiling, when a screw falls on the ground, an operator has to go down from a stepladder and look for the screw, which is very troublesome. Also, even when using a screwdriver that attracts the tip so that the screw does not fall off, the screw groove may come off from the tip of the driver and the screw may stick to the shaft. At this time, the screw may be accidentally dropped, and the troublesomeness cannot be solved.

  According to the first aspect of the present invention, one end of the switching branch bar is connected to the power supply side terminal of the branch breaker, and the other end is selected by a screw as a voltage bar main bar or a neutral pole main bar. Is a screw drop prevention tool used for single-phase three-wire distribution boards that switch voltages by connecting them, and prevents the screws from falling off during voltage switching operations. It is characterized by comprising a main body part having an insertion hole through which a head of the main body is inserted and a holding part for holding a screw at the tip of the main body part.

  According to a second aspect of the present invention, in the screw drop prevention device according to the first aspect, the holding portion is bent by a slit formed at the distal end of the main body portion, and on the inner side of the distal end of the elastic portion. A locking portion protruding and locked to the head of the screw and a protrusion protruding from the inside of the tip of the main body so as to be locked to the screw head opposite the locking portion It is characterized by comprising.

  According to a third aspect of the present invention, in the screw drop prevention device according to the second aspect, the locking portion is formed so as to protrude on both the front end side and the base end side so as to be inclined surfaces. To do.

  According to a fourth aspect of the present invention, in the screw drop prevention device according to any one of the first to third aspects, the neutral pole main bar is arranged so that the insertion hole is perpendicular to the voltage pole main bar. An abutting portion that abuts is provided.

  According to the first aspect of the present invention, since the screw removed at the time of voltage switching work is not dropped, the workability is improved, and when the screw is tightened, the insertion hole of the main body guides the driver to the screw. Therefore, there is an effect that the blade of the driver can be easily engaged with the groove of the screw.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, there is an effect that the screw can be securely held.

  According to invention of Claim 3, in addition to the effect of invention of Claim 2, there exists an effect that the holding | maintenance and detachment | leave of the screw to a screw drop-off prevention tool can be performed smoothly.

  According to the invention described in claim 4, in addition to the effects of the invention described in claims 1 to 3, the screwdriver and the screw are connected to the through hole of the switching branch bar when tightening / loosening to the main pole of the voltage electrode. Since it is straight in the screw hole of the arm piece, there is an effect that the tightening / relaxing workability is easy.

  The screw drop prevention tool consists of a main body part in which a screwdriver shaft for turning the screw and a screw head is inserted, a holding part for holding the screw at the tip of the main body part, and a main bar of the distribution board. The screw hole, the screw and the screwdriver are aligned so that the screw tightening / loosening improves the workability, and the knob is provided so that it can be picked and held by a finger during work.

  First Embodiment A screw drop prevention device according to a first embodiment of the present invention will be described with reference to the accompanying drawings of FIGS.

  In the single-phase three-wire distribution board, in the mounting position of the distribution board, the main bars 1 and 2 with two voltage electrodes and the main bar 3 with one neutral electrode have a predetermined distance from each other in the horizontal direction. A plurality of branch breakers 4 are arranged in parallel along the longitudinal direction on the upper and lower sides of the main bars 1, 2, 3 with the power source side terminal 5 as the main bar 1, 2, 3 side. One power supply side terminal 5 of the branch breaker 4 is connected to the main bars 1 and 2 of one voltage pole through a branch bar 6, and the other power supply side terminal 5 of the branch breaker 4 is connected to a switch branch bar 7. The main pole 3 of the neutral pole or the main bars 2 and 1 of the other voltage pole is connected, and a 100V connection or a 200V connection can be selected.

  The three main bars 1, 2, 3 have a neutral pole main bar 3 arranged on the front side and voltage pole main bars 1, 2 arranged vertically on the rear side. The main pole 3 of the neutral pole has tongues 9 formed with screw holes 8 projecting up and down, and the main bars 1 and 2 of the voltage pole are directed toward the power supply side terminal 5 of the branch breaker 4 on the side closer to the branch bar 6. The arm piece 11 formed with a screw hole 10 is projected toward the power supply side terminal 5 of the branch breaker 4 on the far side.

  The switching branch bar 7 is formed with a mounting piece 15 having one end bent at a right angle and having a through hole 14 through which a screw 13 is inserted, and the other end having a rod-like shape that can be inserted into the power source side terminal 5 of the branch breaker 4. A coupling piece 16 is extended.

  In the switching branch bar 7 formed in this way, the through hole 14 of the mounting piece 15 is neutralized by rotating the connecting piece 16 with the connecting piece 16 inserted into the power source side terminal 5 of the branch breaker 4. It selectively matches with the screw hole 8 of the tongue piece 9 of the pole main bar 3 or the screw hole 10 of the arm piece 11 of the main pole bars 1 and 2 of the voltage pole. The attachment piece 15 of the bar 7 is brought into contact with the tongue piece 9 of the main pole 3 of the neutral electrode, and the screw 13 is inserted into the through hole 14 of the attachment piece 15 to be fastened and fixed to the screw hole 10 of the tongue piece 9. When connecting, the attachment piece 15 of the switching branch bar 7 is brought into contact with the arm piece 11 of the main poles 1 and 2 of the voltage electrode, and the screw 13 is inserted into the through hole 14 of the attachment piece 15 to thereby screw the arm piece 11. Fastened and fixed in the hole 10. And the connection is completed by fastening the terminal screw of the power supply side terminal 5 and fixing the coupling piece 16.

  When the voltage is switched, the voltage can be switched without dropping the screw 13 by using the screw drop prevention tool 20. The screw drop prevention tool 20 includes a cylindrical main body portion 22 having an insertion hole 21 through which the shaft of the driver 17 and the head portion 13a of the screw 13 are inserted, a holding portion 23 that holds the screw 13 at the tip of the main body portion 22, The insertion hole 21 is perpendicular to the arm pieces 11 of the main poles 1 and 2 of the voltage pole so that the front end of the main body portion 22 has a gap with the attachment piece 15 of the switching branch bar 7 in contact with the arm piece 11. A contact portion 24 that is in contact with the main pole 3 of the neutral electrode and a knob portion 25 that can be picked and held by a finger during work are formed.

  The holding portion 23 includes an elastic portion 23b that is bent in the radial direction of the insertion hole 21 by two slits 23a formed from the tip of the main body portion 22 to the middle, and a distal end side and a base on the inner side of the distal end of the elastic portion 23b. A locking portion 23c that protrudes so as to have an inclined surface on both ends so that the head portion 13a of the screw 13 is locked and held, and a head portion 13a of the screw 13 that faces the locking portion 23c. The main body portion 21 is provided with a protrusion portion 23d that protrudes from the inside of the front end so as to be locked and held.

  When switching from a state connected to 100 V to 200 V, first, a terminal screw for fixing the coupling piece 16 of the switching branch bar 7 connected to the power supply side terminal 5 of the branch breaker 4 is loosened. Then, the screw 13 for fixing the attachment piece 15 of the switching branch bar 7 to the tongue piece 9 of the main pole 3 of the neutral pole is removed using the screw drop prevention tool 20. Removal is performed by picking the knob portion 25 and holding the screw drop prevention tool 20 in one hand and holding the screwdriver 17 in the other hand.

  The screw drop prevention tool 20 held in the hand is fitted into the head 13 a of the screw 13 fixed to the tongue piece 9, and is pushed in until the tip of the main body portion 22 comes into contact with the mounting piece 15. Then, by screwing the screwdriver 17 through the insertion hole 21 and loosening the screw 13, the screw 13 gradually protrudes to the near side, and the head portion 13a of the screw 13 flexes the elastic portion 23b to the outside to lock the locking portion 23c and the protruding portion. Get over 23d and lock. When the screw 13 is completely detached from the screw hole 8 of the tongue piece 9, it can be removed in a state where the screw 13 is held by the screw drop prevention tool 10.

  After the screw 13 is removed, next, the switching branch bar 7 is rotated around the coupling piece 16 to bring the attachment piece 15 into contact with the arm pieces 11 of the main poles 1 and 2 of the voltage electrode. Then, the abutting portion 24 of the screw drop prevention tool 20 is brought into contact with the main pole 3 of the neutral pole, and the position of the screw 13 held by the screw drop prevention tool 20 is aligned with the through hole 14 of the mounting piece 15. The screw 13 is pushed by the screwdriver 17 and the screw 13 is inserted through the through hole 14 of the mounting piece 15. Then, the mounting piece 15 of the switching branch bar 7 is fixed by turning the screwdriver 17 and tightening the screw 13 in the screw hole 10 of the arm piece 11. Finally, by tightening the terminal screw of the power source side terminal 5 of the branch breaker 4, the coupling piece 16 of the switching branch bar 7 is fixed, and the voltage switching is completed.

  By making the contact portion 24 of the screw drop prevention tool 20 contact the main pole 3 of the neutral pole, the insertion hole 21 becomes perpendicular to the screw hole 10 of the arm piece 11, and the shaft of the driver 17 and the screw 13 are attached to the mounting piece. 15 through holes 14 and the screw holes 10 of the arm pieces 11 are straightened, so that they can be tightened / loosened smoothly. Further, when the contact portion 24 is brought into contact with the main bar 3, a gap corresponding to the thickness of the head portion 13a of the screw 13 is provided between the mounting piece 15 and the screw 13 when the screw 13 is tightened. The main body portion 22 of the drop-off prevention tool 20 is prevented from being pinched between the screw 13 and the switching branch bar 7 and not coming out.

  When switching from a state connected to 200V to 100V, the reverse procedure is performed. After the voltage switching operation, the screw drop prevention tool 20 can be stored by hooking a dharma hole 26 formed in the knob portion 25 onto a screw or a protrusion inside the distribution board.

  The holding part of the screw drop prevention tool 20 may be formed of a cylindrical rubber to hold the screw, and the structure of the holding part is not limited.

It is a perspective view which shows the main bar and voltage switching structure of a distribution board. It is a perspective view of a state where voltage switching is performed using the screw drop prevention tool according to the present invention, and the screw drop prevention tool is inserted into a screw. It is a perspective view of a state in which voltage switching is performed using the screw drop prevention tool according to the present invention, with the screw being pulled out from the main bar and held on the screw drop prevention tool. FIG. 6 is a perspective view showing a state in which voltage switching is performed using the screw drop prevention tool according to the present invention, and a switching branch bar is switched from a neutral pole main bar to a voltage pole main bar. It is a perspective view of the state which shows a mode that voltage switching is carried out using the screw drop prevention tool concerning the present invention, and fixes a switching branch bar to a main bar of a voltage pole with a screw. The screw drop prevention tool which concerns on this invention is shown, (a) is a top view, (b) is a front view, (c) is a right view. It is AA sectional drawing of FIG. It is the B section enlarged view of FIG. It is a section explanatory view in the state where a screw was held at a screw drop-off prevention tool concerning the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Voltage bar main bar 2 Voltage pole main bar 3 Neutral pole main bar 7 Switching branch bar 9 Tongue piece 11 Arm piece 13 Screw 14 Through hole 15 Mounting piece 16 Joining piece 20 Screw drop prevention tool 21 Insertion hole 22 Main body Part 23 Holding part

Claims (4)

  Single-phase three-wire system that switches the voltage by connecting one end of the switching branch bar to the power supply side terminal of the branch breaker and selectively connecting the other end to the main pole of the voltage pole or the main pole of the neutral pole with a screw A screw drop prevention tool used in a distribution board to prevent the screw from dropping during voltage switching work, and a main body having an insertion hole through which a screwdriver shaft for turning the screw and a head of the screw are inserted And a holding part for holding the screw at the tip of the main body.   The holding portion includes an elastic portion that is bent by a slit formed at the tip of the main body portion, and a locking portion that protrudes from the inside of the tip of the elastic portion and is locked to the head of the screw. 2. The ridge portion according to claim 1, further comprising a ridge portion projecting from the inner end of the main body portion so as to be opposed to the head portion of the screw so as to face the locking portion. Screw fall prevention tool.   The screw drop prevention tool according to claim 2, wherein the locking portion is formed so as to protrude on both the front end side and the base end side so as to be inclined.   4. The screw drop-off according to claim 1, wherein a contact portion that contacts the main pole of the neutral electrode is provided so that the insertion hole is perpendicular to the main bar of the voltage electrode. Prevention tool.

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