JP3117868U - Screw with lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a complete screw loosening prevention by engaging a stopper provided on a screw after fastening with a fastening body or a non-rotating washer, and easily forgetting to forget to tighten a screw. Get a screw with a locking stopper that you can.
SOLUTION: A head 1a of a screw 1 having a head 1a and a screw portion 1b is allowed to be fastened by a fastening jig at the time of fastening, and after being fastened, it is bent to engage with a fastener 11 to loosen the screw. A cylindrical stopper 1d having a predetermined length that exhibits a stopping function was integrally projected.
[Selection] Figure 2

Description

  The present invention relates to a locking screw having a head and a screw portion extending downward from the lower surface of the head.

  Conventionally, this type of screw includes a head and a screw portion extending downward from the lower surface of the head. When the screw is fastened, the lower surface of the head is pressed against the fastening object, and the looseness is prevented only by the pressure resistance.

By the way, in the structure for preventing loosening by simply pressing the fastener on the lower surface of the head, as described above, loosening is likely to occur when vibration or some external force is applied. Further, when forgetting to tighten or loosening a screw, it has a problem that it cannot be easily confirmed visually.
In particular, in recent switchboards, hundreds of wiring terminals are fastened with screws, and expensive equipment stops even if one or two terminal failures occur due to forgetting or loosening of the screws. There was a big problem.

  Therefore, according to the present invention, a stopper provided on a screw after fastening can be engaged with a fastening body or a washer to obtain a complete prevention of screw loosening. It is an object to provide a screw with a locking stopper that can be confirmed.

  In order to solve the above-described problem, the invention described in claim 1 of the present application allows a screw head having a head portion and a screw portion to be fastened by a fastening jig at the time of fastening, and bends after fastening. Thus, a stopper having a predetermined length that engages with an engaging portion of a fastener or a non-rotating washer and exhibits a function of preventing a screw from loosening is integrally projected.

  The invention according to claim 2 of the present application is characterized in that the stopper according to claim 1 is formed of a cylindrical body protruding upward from an outer portion of the head.

  The invention according to claim 3 of the present application is characterized in that the stopper according to claim 1 is composed of one or a plurality of rod-shaped bodies protruding upward from the outer side portion of the head.

  Further, in the invention described in claim 4 of the present application, the stopper according to claim 1 is composed of a casing projecting radially outward from the outer portion of the head, and a plurality of bending split grooves are formed on the upper surface of the casing. It is characterized by that.

  The invention according to claim 5 of the present application is characterized in that the stopper according to claim 1 is composed of a number of petal-shaped projecting pieces projecting radially outward from the outer portion of the head.

  Furthermore, the invention described in claim 6 of the present application includes a square washer having an insertion hole for the screw portion in addition to the configuration of claim 1, claim 2, claim 3, claim 4, or claim 5. In addition, an engaging portion that engages with a stopper is provided at one corner on the upper surface of the square washer, and a plurality of protrusions for preventing rotation are provided on the rear surface.

  According to the screw with a locking device according to the present invention, the screw head is allowed to be fastened by a fastening jig at the time of fastening, and after fastening, the screw is bent to engage with an engaging part of a fastener or a non-rotating washer. Since the stopper of a predetermined length that exhibits the locking function is integrally projected, the stopper can be bent and engaged with the engaging part of the fastening body or the non-rotating washer after fastening. A locking can be obtained. In addition, by confirming whether or not the stopper is engaged with the fastening body or the engaging portion of the washer and the engagement state, it is possible to easily confirm forgetting to tighten the screw visually.

  In addition, when provided with a square washer having an insertion hole to the threaded portion, an engaging portion that engages with a stopper at one corner of the upper surface of the square washer, and a plurality of anti-rotation protrusions on the back surface, By fastening the screw to the fastener with the square washer attached to the lower surface of the head, the protrusion on the back surface of the square washer is locked to the fastener and the rotation of the square washer relative to the fastener can be prevented. Thus, if the stopper is bent and engaged with the engaging portion of the square washer that does not rotate, a complete screw loosening prevention can be obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show the present invention applied to a terminal fastening screw in wiring of a switchboard. The screw 1 includes a head 1a having a circular cross section and a screw part 1b extending downward from the lower surface of the head 1a. It has. A cylindrical stopper having a screwdriver insertion hole 1c in the upper center of the head 1a and rising upward from the head 1a through a continuous portion extending radially outward from the lower portion of the head 1a. 1d is provided integrally. The cylindrical stopper 1d rises upward from the lower side of the head 1a as shown in FIGS. 1 and 2, and rises upward from the outer peripheral portion of the upper surface of the head 1a as shown in FIG. You may comprise.

  FIG. 3 shows another embodiment of the terminal fastening screw in the wiring of the distribution board. The screw 2 has a circular cross-section head 2a and a screw portion 2b extending downward from the lower surface of the head 2a. A plurality of (two in the figure) hook-shaped stoppers that have a screwdriver insertion hole 2c in the upper center of the head 2a and rise upward from the outer surface of the upper surface of the head 2a having a circular cross section. 2d is integrally projected. In the figure, reference numeral 15 denotes a square washer having an engaging projection 15b described later.

  4 and 5 show another embodiment of the terminal fastening screw in the wiring S of the switchboard 10. The screw 3 is a screw and a stopper formed by separate members, and has a circular cross-section. While having a portion 3a and a screw portion 3b extending downward from the lower surface of the head 3a, the head 3a has a driver insertion hole 3c in the upper center, and a plurality ( In the figure, two grooves 3e are provided, and a rod-like stopper 3d made of copper or aluminum wire is formed in the groove 3e, and the stopper 3d is inserted into the groove e and fixed by soldering. It is a thing.

  FIG. 6 shows a state in which the terminal s of the wiring S is fastened to the switchboard 10. The switchboard 10 has a number of compartments 12... 12 for fastening terminals formed by partition walls 11. A screw hole 13 ... 13 is formed at the center.

  FIG. 7 shows a square washer 14 inserted into the partition wall 12 and prevented from rotating, and has a screw insertion hole 14a at the center thereof. Basically, the size of the square washer 14 is substantially the same as that of the compartment 12, and the rotation of the square washer 14 into the compartment 12 is prevented by the surrounding compartment wall 11. Further, FIG. 8 shows another square washer 15 in which an engaging projection 15b is projected from one corner of the square washer 15 having a screw insertion hole 15a in the same manner as the square washer 14 described above. Although the embodiment has been described in which the engaging protrusion 15b is provided at one corner of the corner washer 14, the engaging protrusion 15b may be provided at a plurality of or all of the corners of the corner washer 15. Good.

Next, the operation of each terminal fastening screw will be described.
First, the case where the terminal fastening screw 1 provided with the cylindrical stopper 1d is used will be described. As shown in FIG. 6A and FIG. 9, the screw portion 1b of the terminal fastening screw 1 in a state where the terminal s of the wiring S and the square washer 14 are aligned and overlapped with the screw hole 13 of the switchboard 10. Is inserted into the screw hole 13 through the terminal s from the insertion hole 14a of the square washer 14, and the screw 1 is rotated in the tightening direction by using a screw fastening driver (fastening jig) 16. As a result, the screw portion 1 b of the screw 1 is screwed into the screw hole 13 and the terminal s is fastened to the switchboard 10 via the square washer 14. Needless to say, the screw 1 may be inserted into the square washer 14 in advance for this fastening, and the screw 1 may be screwed into the screw hole 13 while sandwiching the terminal s of the wiring S in this state.

  Thereafter, the cylindrical stopper 1d of the screw 1 is lowered, for example, by a spreader 17 provided on a screw fastening driver (fastening jig) 16 shown in FIG. 9, and one or a plurality of locations of the cylindrical stopper 1d are radially outward. Alternatively, as shown in FIG. 6, only a part of the cylindrical stopper 1d is bent so as to hit the partition wall 11 using a suitable bending jig (not shown). As a result, rotation of the screw 1 in the loosening direction can be prevented, and the screw 1 can be prevented from being unintentionally rotated due to vibration or the like and loosening. As a result, it is possible to reliably prevent the occurrence of terminal contact failure based on the looseness of the screw 1. Further, after fastening the terminal s to each compartment 12 of the switchboard 10, it is possible to easily confirm visually that the screw 1 has been forgotten to be tightened by visually observing whether or not the stopper 1d is opened. In particular, in a switchboard where hundreds of wiring terminals are fastened with screws and expensive equipment stops even if one or two terminal failures occur, it is possible to quickly and easily check forgetting to tighten screws 1 Therefore, it is possible to prevent troubles caused by forgetting or loosening the screws.

  Next, the case where the terminal fastening screw 2 provided with the hook-shaped stopper is used will be described. As shown in FIG. 6B, the screw portion 2 b of the terminal fastening screw 2 is squared with the terminal s of the lead wire S and the square washer 15 aligned and overlapped with the screw hole 13 of the switchboard 10. The screw 2 is inserted into the screw hole 13 through the terminal s from the insertion hole 15a of the washer 15, and the screw 2 is rotated in the tightening direction by using the screw fastening driver 16. Thereby, the screw part 2 b of the screw 2 is screwed into the screw hole 13, and the terminal s is fastened to the switchboard 10 via the square washer 15. Needless to say, the screw 2 may be inserted into the square washer 15 in advance, and the screw 2 may be screwed into the screw hole 13 with the terminal s of the lead wire S sandwiched in this state.

  Thereafter, the hook-shaped stopper 2d of the screw 2 is appropriately bent using a bending jig (not shown) so as to open outward in the radial direction, so that the tip of the stopper 2d is engaged with the engaging protrusion 15b of the square washer 15. Make contact. As a result, the screw 2 can be prevented from rotating in the loosening direction, and the screw 2 can be prevented from being unintentionally rotated due to vibration or the like to loosen the screw 2. As a result, it is possible to reliably prevent the occurrence of terminal contact failure based on the looseness of the screw 2. Further, after fastening the terminals s to the respective compartments 12 of the switchboard 10, it is possible to easily and quickly confirm that the screws 4 have been forgotten to be tightened by visually inspecting whether or not the hook-shaped stopper 2d is open. Troubles caused by forgetting to tighten 1 can also be prevented.

  Further, when the terminal fastening screw 3 provided with the hook-shaped stopper 3d made of a member different from the screw is used, the fastening and bending operations are performed similarly to the case of the terminal fastening screw 2 provided with the hook-shaped stopper 2d described above. Thus, the same effect can be obtained.

  Needless to say, the screws 1, 2, and 3 for fastening the terminals are not limited to the terminal fastening in the wiring of the switchboard, and can be applied as normal fastening screws.

  Further, FIG. 10 shows another embodiment in which the present invention is applied to a normal screw instead of a terminal fastening screw. The screw 4 includes a head 4a having a circular cross section and a lower surface of the head 4a. A screw portion 4b extending downward from the head 4a, a driver insertion hole 4c in the upper center of the head 4a, and a thin hook-like stopper 4d on the outer side below the head 4a. 11, a square washer 16 having a screw hole 16a in the center, an engaging recess 16b in a part corresponding to the stopper 4d on the upper surface, and a plurality of anti-rotation protrusions 16c on the back surface. It is equipped with.

At the time of use, by fastening the screw 4 to the fastening object 20, the protrusion 16 c of the square washer 16 bites into the fastening object 20 and prevents the square washer 16 from rotating. After the fastening, as shown in FIG. 10, a part of the hook-shaped stopper 4d is hit with a jig (not shown) as appropriate to bend and bend, and the bent tip is engaged with the engaging recess of the square washer 16. The screw is prevented from loosening by engaging with 16b. As a result, rotation of the screw 4 in the loosening direction can be prevented, and the screw 4 can be prevented from being unintentionally turned due to vibration or the like and loosening the screw 4. In addition, after fastening, it is possible to easily and quickly confirm that the screw 4 is forgotten to be tightened by visually inspecting whether or not the hook-shaped stopper 4d is open. Therefore, trouble due to forgetting to tighten the screw 4 can be prevented. be able to.
Of course, the hook-shaped stopper 4d and the screw 4 provided with the square washer 16 may be used for terminal fastening in the wiring of the switchboard described above. In that case, the protrusion 16c of the square washer 16 need not be provided. In addition, when the present invention is applied to a normal screw, it is needless to say that a circular, polygonal or irregular washer having a protrusion 16c may be used in addition to using the above-described square washer 16 so as not to rotate.

  12 to 14 show another embodiment of the screw provided with the hook-shaped stopper, and FIG. 12 shows that a large number of split grooves 5e... 5e having a chrysanthemum pattern are formed on the upper surface of the hook-shaped stopper 5d. Screw 5. FIG. 13 shows a screw 6 in which a number of split grooves 6e... 6e are formed at a predetermined interval on the upper surface of the bowl-shaped stopper 6d. Further, FIG. 14 shows a screw 7 in which a hook-shaped stopper is formed from a number of stoppers 7d. The split groove 5e or 6e may be formed simultaneously with the stopper 5d or 6d when the hook-shaped stopper-attached screw 5 or screw 6 is formed by forging. The stoppers 7d... 7d may be trimmed into petals after the forged screw 7 is forged.

  In use, for example, as shown in FIG. 12, a square washer that does not rotate the bent tip portion by hitting a hook-like stopper 5d with a jig (not shown) as appropriate and partially bending it using the split groove 5e. What is necessary is just to prevent loosening by engaging with the 16 engagement recessed part 16b or the engagement recessed part of a fastening thing. Thereby, the same effect as the case of the screw 4 provided with the hook-shaped stopper 4d described above can be obtained. Further, by forming the split grooves 5e, 6e or a number of petal-like stoppers 7d, the stopper can be easily bent, that is, easily engaged with the engaging recess.

  Further, FIG. 15 has a multi-groove 8e on the upper surface of the head 8a of the bolt 8 having a head 8a having an engagement hole 8c having a hexagonal cross section and a screw portion 8b extending downward from the lower surface of the head 8a. A hook-shaped stopper 8d is formed. In this case, when forging the screw 8 provided with the hook-shaped stopper 8d, the split groove 8e may be simultaneously formed in the hook-shaped stopper 8d.

  At the time of use, as shown in FIG. 16, after the screw 8 is fastened to the fastening object 21, the hook-shaped stopper 8d is hit with an appropriate jig (not shown) and partially bent using the split groove 8e, What is necessary is just to prevent loosening by engaging the bending front-end | tip part with the engagement recessed part 21a formed in the fastening thing 21. FIG. Thereby, the same effect as the case of the screw 4 provided with the hook-shaped stopper 4d described above can be obtained. In addition, the dividing groove 8e makes it easy to bend the stopper 8d, that is, easily engages with the engaging recess 21a.

  It is a perspective view of the screw with a locking stopper concerning the present invention.   It is the longitudinal cross-sectional view.   It is a perspective view which shows another embodiment.   It is a perspective view which shows another embodiment.   FIG. 5 is a plan view of FIG. 4.   It is explanatory drawing which shows the use condition to a switchboard.   It is a perspective view of a square washer.   It is a perspective view of another square washer.   It is a longitudinal cross-sectional view which shows the fastening state to a switchboard.   It is a partial longitudinal cross-sectional view which shows another embodiment.   It is sectional drawing of the washer in FIG.   It is a partial longitudinal cross-sectional view which shows another embodiment.   It is explanatory drawing which shows another embodiment of a hook-shaped stopper.   Furthermore, it is explanatory drawing which shows another embodiment of a hook-shaped stopper.   It is a perspective view which shows another embodiment.   It is a longitudinal cross-sectional view of the principal part which shows the use condition.

Explanation of symbols

1 Screw 1a Head 1b Screw 1d Stopper 2 Screw 2a Head 2b Screw 2d Stopper 3 Screw 3a Head 3b Screw 3d Stopper 4 Screw 4a Head 4b Screw 4d Stopper 5 Screw 5a Head 5b Screw 5d Stopper 6 Screw 6a Head 6b Screw part 6d Stopper 7 Screw 7a Head 7b Screw part 7d Stopper 8 Screw 8a Head 8b Screw part 8d Stopper 11 Fastener 14 Square washer 14a Insertion hole 14b Engagement protrusion 15 Square washer 15a Insertion hole 15b Protrusion

Claims (6)

  The screw head provided with the head and the screw part is allowed to be fastened by a fastening jig at the time of fastening, and after being fastened, it is bent to engage with the engaging part of a fastener or a non-rotating washer to prevent the screw from loosening. A screw with a locking feature, characterized by integrally projecting a stopper of a predetermined length that demonstrates its function.   The screw with a locking stopper according to claim 1, wherein the stopper is formed of a cylindrical body projecting upward from an outer portion of the head.   2. The screw with a loosening prevention according to claim 1, wherein the stopper is composed of one or a plurality of hooks protruding upward from the outer side of the head.   2. The slack according to claim 1, wherein the stopper is made of a hook-like body projecting radially outward from the outer portion of the head, and a plurality of bending grooves are formed on the upper surface of the hook-like body. Screw with stop.   2. The screw with a locking stopper according to claim 1, wherein the stopper includes a plurality of petal-shaped projecting pieces projecting radially outward from an outer portion of the head.   A corner washer having an insertion hole for a screw portion is provided, an engaging portion that engages with a stopper is provided at one corner of the upper surface of the square washer, and a plurality of protrusions for preventing rotation are provided on the back surface. Claim 2 or Claim 3 or Claim 4 or Claim 5.

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