JP3166497U - Locking screw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a loosening set screw capable of completely preventing loosening of a screw body by engaging a screw body with a washer at a tightening stop position. SOLUTION: The screw body 2 has a head 21 and a square washer 3 rotatably interposed between the head 21 of the screw body 2 and the screw portion 22. Flange portions 24 are integrally provided on the outer periphery of the head 21 in the screw body 2, and the engaging protrusions that have elasticity at four positions of the flange portions 24 and project downward from the lower surface of the head 21. 25 ... 25 are integrally provided by molding. Engagement grooves 32 ... 32 into which the engagement protrusions 25 ... 25 are inserted are provided at four locations on the upper surface of the washer 3 by molding, and the engagement protrusions 25 ... 25 are provided when the screw body 2 is stopped from being tightened. Is engaged with the engaging grooves 32 ... 32 so that the screw body 2 is prevented from loosening by the washer 3. [Selection diagram] Fig. 6

Description

  The present invention mainly relates to a locking screw used when a lead wire terminal is fastened to an electrical connector terminal block such as a switchboard.

  Conventionally, for example, in an electrical connector terminal block of a switchboard, a number of terminal fastening compartments having a square shape are formed by a partition wall, and a female screw member made of a current-carrying member is disposed at the center of the compartment. A fastening screw with a head having a washer is provided on the female screw member so that it can be screwed together.

  When the lead wire terminal is fastened to the connector terminal block, first, the fastening screw is temporarily screwed into the female screw member located at the center of the compartment, and then the fastening screw. The U-shaped tip of the lead wire terminal is inserted between the washer located on the lower surface of the head and the female screw member, and at the same time, the screw portion of the fastening screw is fitted in the recess of the tip, and then the fastening screw By tightening, the lead wire terminal is pressed against the female screw member via a washer, and tightened while preventing loosening.

  However, according to the fastening screw having the washer having the structure described above, the lead wire terminal is simply pressed against the female screw member via the washer at the head of the fastening screw, and the loosening prevention is performed only by the pressure resistance. Therefore, there has been a problem that after the fastening, when a vibration or some external force is applied, a sliding rotation occurs in the loosening direction between the washer and the fastening screw, and the fastening screw is loosened.

  In particular, in the electrical connector terminal block of large switchboards, thousands of lead wire terminals are fastened with thousands of fastening screws. Even if two were generated, there was a big problem that expensive equipment stopped.

  Therefore, an object of the present invention is to provide a locking screw that can securely engage the screw body with the washer when tightening is completed, and can reliably prevent the screw body from loosening.

  In order to solve the above-mentioned problem, the device according to claim 1 of the present application includes a screw body 2 with a head portion 21 and a corner rotatably interposed between the head portion 21 and the screw portion 22 of the screw body 2. The flange portion 24 is integrally provided on the outer periphery of the head portion 21 of the screw body 2, and the head portion 21 has elasticity at equal intervals at four positions of the flange portion 24. Engagement protrusions 25... 25 projecting downward from the lower surface are integrally provided by molding, while the engagement protrusions 25... 25 enter the upper surface 4 of the washer 3 at equal intervals. The mating grooves 32... 32 are formed by molding, and when the tightening of the screw body 2 is stopped, the threaded body 2 is prevented from being loosened by the washer 3 by engaging the engaging protrusions 25. It is comprised so that it may be comprised.

  The invention according to claim 2 of the present application is a four-corner in which the washer 3 according to claim 1 is non-rotatably inserted into a rectangular terminal fastening compartment 6 having a female screw member 7 of an electric connector terminal block 4. It is formed in a shape.

  The invention according to claim 3 of the present application is characterized in that the shape of the head 21 in the screw body 2 according to claim 1 can be arbitrarily selected from hexagon, square, socket, plus, plush, minus, and the like. To do.

  According to the locking screw of the present invention, when the tightening of the screw body 2 is completed, the engagement protrusions 25... 25 provided on the head 21 of the screw body 2 are fitted into the engagement grooves 32. Thus, the screw body 2 can be reliably prevented from being loosened by the washer 3.

  Further, if the washer 3 is formed in a quadrangular shape that is non-rotatably mounted in the rectangular terminal fastening compartment 6 having the female screw member 7 of the electric connector terminal block 4, the side surface portion of the compartment chamber 6 is formed. The abutting against the partition wall 5 is prevented. Thereby, when the tightening of the screw body 2 is completed, when the engagement protrusions 25... 25 provided on the head 21 of the screw body 2 are fitted into the engagement grooves 32. In combination with the non-rotatable action of the washer on the compartment 6, a locking screw is obtained in which the screw body 2 is never loosened by the washer 3.

  Furthermore, as the shape of the head 21 in the screw body 2, a hexagon, a square, a socket, a plus, a plush, a minus shape, or the like can be freely selected according to the place of use.

It is a front view of the locking screw which concerns on this invention. It is the longitudinal cross-sectional view. It is a bottom view of a screw body. It is a top view of a washer. It is a partially cutaway front view just before fastening. It is a partially cutaway front view after fastening. It is a partially cutaway perspective view immediately before fastening. It is a front view of another embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 4 show a locking screw according to the present invention, and the locking screw 1 is used when a lead wire terminal 8 is fastened to an electrical connector terminal block 4 such as a switchboard described later. The locking screw 1 includes a screw body (plus screw) 2 with a head portion 21 and a rectangular washer 3 that is rotatably provided on a neck portion 23 between the head portion 21 and the screw portion 22 of the screw body 2. Prepare.

  An annular flange portion 24 is integrally provided on the outer periphery of the lower portion of the head portion 21 of the screw body 2, and four protrusions of the flange portion 24 are elastically projected at equal intervals and protrude downward. Portions 25 ... 25 are provided. As shown in FIGS. 1 and 3, the engagement protrusion 25 includes a notch extending in the radial direction in the annular flange portion 24 and a notch extending along the base of the flange portion 24 following this, The front ends of the two cuts are bent and formed into a square shape so that the front ends protrude downward while having elasticity. At this time, the cuts provided in the flange portion 24 are inserted so that the engagement protruding portions 25... 25 are located on the opposite side of the tightening rotation direction of the screw body 2.

  Further, the washer 3 has an insertion hole 31 at the center thereof, and has four engagement grooves 32... 32 that engage with the engagement protrusions 25... 25 on the upper surface thereof as shown in FIGS. It is provided in the place. Thus, the screw body 2 is prevented from being loosened by the washer 3 by fitting the engaging protrusions 25... 25 into the engagement grooves 32. It is comprised so that. In order to prevent the washer 3 from falling off the screw body 2, for example, a part of the insertion hole 31 of the washer 3 is reduced in diameter so that the washer 3 is positioned at a neck portion 23 portion having a smaller diameter than the screw portion 22 of the screw body 2. Alternatively, a structure that can be detached from the screw body 2 may be used.

  On the other hand, as shown in FIGS. 5 to 7, the electrical connector terminal block 4 of the switchboard is formed with a number of terminal fastening compartments (not shown in FIG. 1) 6 having a rectangular shape by the partition walls 5. A female screw member 7 made of a current-carrying member is fixed in the center of each compartment 6, while the loosening screw 1 having a washer 3 is provided on the female screw member 7 so as to be freely screwed together. It has become. In that case, the washer 3 is formed in a quadrangular shape that is non-rotatably inserted into the compartment 6, so that when the washer 3 is inserted into the compartment 6, the side face of the washer 3 is the compartment of the compartment 6. The rotation is stopped by coming into contact with the wall 5.

  Next, the operation of the above-described locking screw 1 will be described.

  As shown in FIGS. 5 and 7, when the lead wire terminal 8 is fastened to the connector terminal block 4, the screw body 2 is first returned to the loosened state with respect to the screw member 7. Next, the U-shaped tip portion 81 of the lead wire terminal 8 is inserted between the washer 3 and the female screw member 7 located at the neck portion 23 of the screw body 2, and at the same time, the screw portion 22 of the screw body 2 is inserted into the tip recess. Is inserted. Thereafter, as shown in FIG. 6, the lead wire terminal 8 is pressed and fixed to the female screw member 7 through the washer 3 by tightening the screw body 2.

  Then, when the tightening of the screw body 2 is completed, the engagement protrusions 25... 25 of the screw body 2 are fitted into the engagement grooves 32... 32 of the washer 3 as shown in FIG. As a result, even if vibration or some external force is applied to the screw body 2 after fixing, no slip rotation occurs in the loosening direction between the washer 3 and the screw body 2, and the screw body 2 is prevented from loosening. It can be done reliably.

  In addition, at this time, the side face of the washer 3 abuts against the partition wall 5 of the partition chamber 6 and is prevented from rotating, whereby the engagement protrusions 25... 25 provided on the head 21 of the screw body 2 are prevented. A locking screw that prevents the screw body 2 from being loosened by the washer 3 in combination with the non-rotatable action of the washer 3 on the compartment 6 when engaged with the engaging grooves 32... 32 of the washer 3. can get.

  Note that, when the screw body 2 is tightened, the engagement protrusions 25... 25 of the screw body 2 are fitted into the engagement grooves 32... 32 of the washer 3, but the engagement protrusions 25. Since the cut end is formed so as to have elasticity, and the tip portion on the opposite side to the tightening rotation direction at the cut is formed by being bent into a square shape, the engagement protrusion 25. The front end portion 25 is firmly engaged with the engagement grooves 32... 32 in the loosening direction of the screw body 2, but the engagement grooves 32. Therefore, it can be easily lifted upward and escaped, and there is no problem in the tightening operation.

  In the above-described embodiment, the screw body 2 using a plus screw has been described. However, for example, a screw body 2 having a hexagonal head 21a as shown in FIG. 8 may be used. Also in this case, the annular flange portion 24 is integrally provided on the lower outer periphery of the hexagonal head 21a as in the above-described embodiment, and the flange portion 24 has elasticity at equal intervals at four locations. In addition, it is only necessary to provide engaging protrusions 25... 25 protruding downward. In addition, of course, the shape of the head 21 may be, for example, a square, a socket, a pallet, or a minus. Further, the washer 3 may be used as a common part that can be attached to the various screw bodies 2. Furthermore, in the above-described embodiment, the case where the lead wire terminal 8 is fastened to the connector terminal block 4 has been described using the locking screw 1 of the present plan, but it may be used other than the connector terminal block 4. Of course.

DESCRIPTION OF SYMBOLS 1 Locking screw 2 Screw body 3 Washer 4 Electrical connector terminal block 5 Partition wall 6 Compartment chamber 7 Female thread member 8 Lead wire terminal 21 Head 22 Screw part 24 Flange part 25 Engagement protrusion part 32 Engagement groove

Claims (3)

  The screw body 2 with a head 21 and a square washer 3 rotatably interposed between the head 21 and the screw portion 22 of the screw body 2, The flanges 24 are provided integrally, and the engagement protrusions 25... 25 that are elastically spaced at four positions on the flanges 24 and project downward from the lower surface of the head 21 are formed by molding. On the other hand, the engaging grooves 32... 32 into which the engaging protrusions 25... 25 are inserted at equal intervals are provided at four positions on the upper surface of the washer 3 by molding so that when the tightening of the screw body 2 is stopped. A loosening-preventing screw, wherein the threaded body 2 is prevented from being loosened by a washer 3 by engaging the engaging protrusions 25 ... 25 with engaging grooves 32 ... 32.   The washer (3) is formed in a square shape that is non-rotatably inserted into a rectangular terminal fastening compartment (6) having a female screw member (7) of an electric connector terminal block (4). Set screw.   2. The locking screw according to claim 1, wherein the shape of the head 21 in the screw body 2 can be arbitrarily selected from hexagonal, square, socket, plus, plush, minus, and the like.

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