JPH0645691Y2 - Screw parts equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to bolts in electric equipment, structures, vehicles, etc.
It is possible to loosen the screw parts by temporarily tightening them with nuts, etc. and temporarily tightening them so that they will not be easily loosened by external force such as vibration or shock after reaching the predetermined tightened state. Screw device.

[Conventional technology]

There are various types of devices that prevent the screw parts from returning, but among them, as a device that has a relatively simple structure and is easy to handle, there is a square hole in the center and the ear piece integrally projects around. The provided washer is fitted to the end of the bolt protruding from the surface of the base body, and a nut having a notch formed at a symmetrical position on the outer periphery of the seat surface to provide a substantially rectangular engaging portion The nut is screwed into the end to engage the substantially rectangular engaging portion of the nut with the square hole of the washer, and at the same time, the ear piece of the washer is provided with a large number of protrusions provided on the surface of the base body along the same circumference so as to surround the washer. It is known that the nut is prevented from returning by being inserted between the protrusions and engaged with the protrusions (see Registered Utility Model No. 372243).

[Problems to be solved by the device]

However, since the above-mentioned known nut return prevention device is provided with the projection directly engaged with the ear piece of the washer on the surface of the base, there are cases where the projection cannot be directly provided on the surface of the base. Poor.

When the nut is screwed into the washer, the washer rotates together with the washer, and once the ear piece of the washer engages with the protrusion, the nut cannot be tightened any more. On the contrary, it is impossible to loosen it. Therefore, when screwing in the nut, bend the ear piece of the washer beforehand so that it does not hit the protrusion, raise it and temporarily tighten it, and then fully tighten it.
It is necessary to extend the ear piece flat so that it can be inserted between the protrusions, which may be inconvenient because it may interfere with the tightening and loosening work.

If the ear piece of the washer is not stretched enough, the engagement with the projection becomes unstable, and there is a risk that it will be loosened carelessly due to vibration or shock.

The present invention has an object to provide a screw component device that can be loosened in a temporarily tightened state and does not loosen in a predetermined tightened state in consideration of an emergency case.

[Means for Solving the Problems]

In order to achieve the above object, the screw component device of the present invention comprises:
A screw part having a stepped portion formed on the outer periphery of the seat surface, a washer having a larger diameter than the screw part and provided with a number of projections along the same circumference, and a non-rotating fit to the stepped part of the screw part,
A lock member having a claw that locks to the protrusion of the washer, and a breakable separator that is arranged between the washer and the lock member and has a hole with a diameter that does not receive the screw tightening pressure in the center. The gist of the present invention is that the surface of each protrusion of the washer is formed as a one-way inclined surface that rises in the tightening rotation direction of the screw component, and an annular recess that receives the protrusion of the washer is formed on one surface of the separator.

[Action]

If the threaded component is a bolt, fit the lock member / separator and washer with protrusion in that order, with the claw of the lock member facing the separator plate, and fit it under the neck of the bolt. Fit in the step of.

When the bolts are tightened in this state, the claws of the lock member come into contact with the separator, and the washer is fixed when the washer is pressed against the surface of the base and the frictional resistance between the washer and the base increases.

Since the separator is slip-free with respect to the washer, the bolt can be tightened or loosened in this temporarily tightened state. In this case, the separator and the lock member are inserted through and supported by the bolt outside the seating surface of the bolt that receives the tightening pressure, so that the co-rotation is not blocked by the increase in the tightening pressure.

Then, the bolt is turned until a predetermined tightening pressure is obtained, and then the separator is appropriately broken and removed, so that the claw of the lock member comes into contact with the surface of the washer. Even if the bolt is loosened in this state, the claw of the lock member integrated with the bolt is caught by the protrusion of the washer and cannot be rotated.

If it becomes necessary to loosen the bolt after the final tightening for some reason, the claw of the lock member is bent so as to cause the bolt head side, and the engagement with the protrusion of the washer is released.

If the threaded component is a nut, first attach a washer with a protrusion to the tip of the bolt projecting on the surface of the base and apply it to the surface of the base, and then attach the lock member and the separator to the stepped portion on the outer periphery of the nut seat surface and the separator. The nut is screwed into the bolt with the nut attached to the outside.

〔Example〕

Next, an embodiment of the screw component device of the present invention will be described with reference to the drawings.

FIG. 1 shows an example in which the device of the present invention is applied to a bolt. An annular step portion 2 is provided on the bearing surface of the bolt 1, and a chamfered portion 21 is provided at a symmetrical position on the outer periphery of the annular step portion 2 to form a substantially oval shape. Is formed.

The washer 3 to be fitted on the bolt 1 has a diameter much larger than that of the bolt 1, and a large number of protrusions 4 are provided near the outer circumference thereof along the same circumference. Although the washer 3 in the figure has a disc shape, the disc spring washer may be directly provided with a protrusion.

The surface of each of the protrusions 4 on the washer 3 is formed as a single-flow slope inclined so as to be higher in the tightening rotation direction of the bolt 1. Further, it is suitable that the projection 4 is formed by press projecting as shown in FIG.

The lock member 5 fitted in the annular step portion 2 of the bolt 1 has a substantially oval hole 51 formed in the center thereof, which fits in the step portion 2 of the seat surface of the bolt 1, and has a pair of arms 52 in opposite directions on the outer circumference. Overhangs. Further, a claw 6 that engages with the protrusion 4 of the washer 3 is bent and formed at the tip of each arm 52. The lock member 5 is made by punching and bending stainless steel or spring steel to give the arm 52 flexibility.

Separating plate 7 interposed between the washer 3 and the lock member 5.
Has a hole with a diameter that does not receive the tightening pressure of the bolt 1, that is, a hole 71 that loosely fits around the annular step portion 2 of the bolt 1 in the center of the disk.

Further, on one surface of the separating plate 7, groove-shaped recesses 8, 8 into which the pair of claws 6 of the lock member 5 are fitted are formed in the diametrical direction.

Further, as shown in FIGS. 3 and 4, an annular recess 9 is formed on the other surface for receiving each projection 4 of the washer 3 when the washer 3 is overlapped with the washer 3.

Since the separator 7 is configured to be rupturable, a suitable material is, for example, polystyrene resin or other hard synthetic resin, and it is preferable to color the separator 7 in a conspicuous color such as red, orange, or yellow.

The thickness of the separator 7 is determined in consideration of the depth of the recesses 8 and 9 on the front and back surfaces, or conversely, in consideration of the thickness of the separator 7, the depth of the recesses 8 and 9 and the protrusion of the washer 3. The height dimension of 4 is set.

A notch hole 10 for inserting a breaking tool and a concave portion 11 using a screwdriver or the like are formed at appropriate positions on the periphery of the separator 7.

As shown in the illustrated example, the breaking tool insertion notch hole 10 is provided in a pair in the extension direction of the groove-shaped recess 8 into which the claw 6 fits, and the breaking tool insertion recess 11 is provided as a pair with the notch hole 10 at a 90-degree phase. Good.

Further, a fragile portion 13 is provided on the back side of the groove-shaped recess 8 into which the claw 6 fits, and a recess 12 is provided so as to traverse the annular recess 9 to make the wall thinner.

Material / thickness of separator 7 or notch hole for inserting broken tool
Depending on the selection of the depth of 10 and the like, the fragile portion 13 may not be necessary.

FIG. 5 shows the bolt 1, the lock member 5, the separator 7, and the washer 3.
The lock member 5 is shown by tightening
The separator 7 fits into the step portion 2 of the bolt 1, the lock member 5 fits like a detent, and the lock member 5 and the separator plate 7 engage with the claw 6 and the recess 8 to connect the bolt 1 and the lock member 5. The separator plate 7 is integral. The washer 3 is sandwiched and fixed between the seat surface of the bolt 1 and the base body A. Then, the protrusion 4 of the washer 3 is set in the annular recess 9 of the separator 7, and the lock member 5 is bent outward with the pawl 6 engaged with the recess 8.

When the bolt 1 is turned in the screw return direction from the tightened state shown in FIG. 5, the separator 7 slips with respect to the washer 3, so that the bolt 1 is loosened.

FIG. 6 shows a state in which the separating plate 7 is broken and removed.
The warped lock member 5 is elastically returned and the claw 6 is engaged with the protrusion 4 of the washer 3 so that the bolt 1 can be rotated in the tightening direction, but cannot be rotated in the opposite direction.

The breakage of the separating plate 7 is carried out, for example, by inserting the tip of a screwdriver into the notch hole 10 and turning it, and the fragile portion 13 is broken. Alternatively, the tip of the driver is pushed into the concave portion 11 to pry it, and the separator 7 is broken from the fragile portion 13. The two-divided separator 7 is removed by pinching and pulling it out.

The number of the protrusions 4 of the washer 3 is arbitrary, and the number of the claws 6 of the lock member 5 that is locked to the protrusions 4 is also arbitrary, but the number of the claws 6 is equal to the number of the protrusions 4 formed on the washer 3. It is decided by collation. Therefore, the claw 6 of the lock member 5 may be one as shown in FIG.

When there are a plurality of claws 6 of the lock member 5, when one claw 6 rides on the protrusion 4 of the washer 3 due to the breakage removal of the separator plate 7, the other claw is always disengaged from the protrusion 4 or the claws or protrusions. It is desirable to set the position and number of each of the.

The separator 7 in the illustrated example has a groove-shaped recess 8 on one surface of which the claw 6 of the lock member 5 fits, but the recess 8 may not be provided.

The shape of the step portion 2 formed on the seat surface of the bolt 1 is, in addition to the substantially oval shape shown in FIG. 1, is a regular hexagon as shown in FIG. Is integrated with the bolt 1. The hole 51 of the lock member 5 in FIG. 7 is shown as a regular hexagon in conformity with the step portion 2 of the bolt 1 in FIG.

FIG. 9 shows an embodiment in which a chamfered portion 21 for fitting and locking the lock member 5 is provided on the annular step portion 2 of the seat surface of the double headed bolt 1 having a thin neck portion that is sheared with a predetermined torque. .

The screw component device of the present invention can be applied to not only the above bolts but also nuts. FIG. 10 shows an example in which the nut is used. As in the case of the bolt, the annular step portion 2 formed on the bearing surface of the nut 14 is used.
The seating surface is formed into a substantially oval shape by providing a chamfered portion 21 at a symmetrical position on the outer periphery of the seat.

When the device according to the present invention is applied to the above nut, the lock member 5 and the nut 14 are previously integrated by fitting the lock member 5 firmly to the oval step portion 2 of the nut 14 or by fitting with an adhesive. The workability is good if this is set.

FIG. 11 shows a modified example of the separating plate 7, in which the bearing surface of the bolt 1 has a protrusion 3 on the bearing surface due to the height of the annular step portion 2 and other relations.
When it does not reach, the space maintaining washer 15 (shown in FIG. 11) may be interposed between the seat surface of the bolt 1 and the washer 3 with protrusions, which is a separator used in such a case.

The hole diameter of the space maintaining washer 15 naturally fits the shaft diameter of the bolt 1, and the outer diameter is larger than the bearing surface of the bolt 1,
It is inside the inner end of the claw 6 of the lock member 5 fitted in the annular step portion 2.

Therefore, as shown in FIG. 11, the center hole 71 of the separating plate 7 has a diameter that fits the outer circumference of the space maintaining washer 15, and the space maintaining washer 15 and the separating plate 7 have substantially the same thickness. is there.

When the bolt 1 is tightened with the space maintaining washer 15 fitted in the bolt 1 concentrically inside and outside and the washer 3 with the protrusion on the outer side of the separator 7, the washer 3 with the protrusion is attached to the bolt 1 via the distance maintaining washer 15. Although the pressing force is applied from the seat surface, the separator 7 is separated from the seat surface of the bolt 1, so that the bolt 1 is engaged with the claw 6 of the lock member 5 without receiving the tightening pressure of the bolt 1. It goes with them.

[Effect of device]

A screw component device according to the present invention comprises a screw component having a step portion formed on the outer periphery of a seat surface, a washer having a larger diameter than the screw component and provided with a plurality of protrusions along the same circumference, and a step of the screw component. The lock member has a claw that fits into the lock portion and locks with the protrusion of the washer, and is arranged between the washer and the lock member, and a hole with a diameter that does not receive the screw tightening pressure is formed in the center. It consists of a breakable separator plate, and the surface of each protrusion of the washer is formed as a single-flow slope that rises in the tightening rotation direction of the screw part, and one side of the separator plate has an annular recess for receiving the washer protrusion. Since it is formed, if the screw parts (bolts, nuts, etc.) are temporarily tightened, the partition plate 7 can be left attached to facilitate the screw part 1 if it becomes necessary to loosen it. Can be loosened.

After tightening with a predetermined pressing force, the separator 7 is broken and removed, so that the claw 6 of the lock member 5 integral with the screw component 1 and the projection 4 of the washer 3 that is fixed are engaged and locked. In this state, the screw component 1 cannot be loosened, and is not loosened by vibration or impact. Then, it is possible to easily confirm whether or not the screw parts are locked by visually inspecting the presence or absence of the separator 7.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a screw component device of the present invention applied to a bolt, FIG. 2 is an enlarged vertical sectional view of a washer protrusion, and FIG.
Figure is a front view of the separator, Figure 4 is a cross-sectional view taken along the line IV-IV in Figure 3, Figure 5 is a partial vertical side view in the temporarily tightened state, and Figure 6 is a partial vertical side surface in the fully tightened state. Fig. 7 is a perspective view of a modification of the lock member, Figs. 8 and 9 are perspective views showing a modification of the step portion of the seat surface of the bolt, and Fig. 10 is the device of the present invention applied to a nut. FIG. 11 is a perspective view showing a seat surface of the nut in the case, and FIG. 11 is a front view of a modified example of the separator. 1 and 14 are screw parts, 2 is a step portion of the seat surface, 21 is a chamfered portion, 3 is a washer, 4 is a protrusion, 5 is a locking member, 6 is a claw, 7 is a separating plate, 71 is a hole, and 8 is a claw. A recessed portion that fits in, an annular recessed portion that receives a projection, a cutout hole for inserting a breaking tool, a recessed portion for inserting a breaking tool, and a fragile portion.

Claims (1)

[Scope of utility model registration request] 1. A screw component having a step formed on the outer periphery of a seat surface,
A washer having a larger diameter than the threaded part and provided with a number of projections along the same circumference, and a lock member having a claw that fits into the stepped part of the threaded part in a non-rotatable manner and that is locked to the projection of the washer. , A breakable separator which is arranged between the washer and the lock member and has a hole with a diameter that does not receive the screw tightening pressure in the center, and the surface of each protrusion of the washer is tightened in the screw rotation direction. A screw component device which is formed on a single-flow slope that rises toward the side and has an annular recess formed on one surface of a separator to receive a protrusion of a washer.