JPH1061647A - Tightener - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent drop of a nut by providing a tightener comprising a bolt and a nut screwed in a screw shaft of the bolt and providing the screw shaft with a drop-off preventing part for the nut. SOLUTION: A bolt 1 comprises a square head part 7 and a screw shaft 2 projected from the center of the part, an annular engaging groove 5 is recessed on the whole periphery of the shaft end part of the screw shaft 2, and an E-ring 6 can be installed in the groove. After a nut 3 is fitted, the E-ring 6 is assembled in the engaging groove 5, and the outside diameter thereof is larger than that of the hole diameter of the nut 3. The bolt 1 and the nut 3 are assembled to a battery terminal prior to connection to the battery, and are carried in a job site for connection to the battery. At this time, as the E-ring 6 is fitted in the engaging groove 5, even if the nut 3 is moved in the direction of screw- moving backward by the vibration in the course of carry-in operation, the nut will not slip off. Accordingly, the loss of a the nut 3 and the need of work for fitting a nut again can be eliminated so as to heighten the work efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastener comprising a bolt and a nut.

[0002]

2. Description of the Related Art For example, a battery terminal mounted on an automobile is connected to a battery terminal. At the time of connection, a fastener using a bolt 40 and a nut 41 is used as shown in FIG. Battery terminal 42
Is attached to the electrode P of the battery B,
And the electric wire W. In the first half of the battery terminal 42, a cylindrical portion 43 that wraps and fixes the electrode P is arranged. A pair of tightening legs 44 extend behind the cylindrical portion 43, and both have an insertion hole 45 provided therein. To attach the battery terminal 42 to the electrode P, a bolt 40 is passed through the insertion hole 45 of the fastening leg 44, and the bolt 40 is fastened with a nut 41. Then, the fastening leg 44 deforms the cylindrical portion 43 in the ring closing direction, and the battery terminal 42 is fixed to the electrode P.

[0003]

By the way, when performing the above operation, the nut 41 is loosely fastened to the bolt 40 previously passed through the insertion hole 45. That is, after transporting the battery terminal 42 in which the bolts 40 and the nuts 41 are integrated in advance as described above to the work place, the cylindrical portion 43 is connected to the electrode P.
And tighten the nut 41 strongly.

However, during transportation of the battery terminal 42, the nut 41 may come off from the bolt 40 due to vibration or other members coming into contact with the nut 41. In such a case, the nut 41 needs to be re-attached or is lost. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fastener including a bolt and a nut which can prevent the nut from falling off.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 comprises a bolt and a nut screwed into a screw shaft of the bolt, and the screw shaft has a detachment with respect to the nut. A fastener provided with a stopper.

According to a second aspect of the present invention, in the first aspect, the retaining portion of the nut is provided with a split groove along an axial direction from an end face of the screw shaft, and the screw in a natural state is provided. A fastener characterized in that the nut is prevented from coming off by opening the end of the shaft in a spread manner. The invention according to claim 3 is the fastener according to claim 2, wherein a tapered surface for guiding the screwing of the nut is formed on an outer surface of a leg end of the screw shaft. It is.

[0007]

According to the first aspect of the present invention, since the retaining portion for the nut of the shaft portion of the bolt is formed, even if vibrations or the like are received, the nut is further screwed at the retaining portion. Retraction is restricted, and the situation of falling off from the screw shaft is avoided. Therefore, the nut is not lost or re-attached, so that the efficiency of the operation can be improved.

According to the second aspect of the present invention, since the shaft end of the screw shaft is opened in a divergent shape by providing the split groove, the nut is screwed up to a position passing through the open leg portion. Can be achieved. Since the configuration is simply provided with such split grooves, the structure is simple and low cost can be realized. According to the third aspect of the invention, since the tapered surface is formed at the open end of the screw shaft, the operation of screwing the nut into the screw shaft can be performed smoothly.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

<First Embodiment> Next, a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, also in this embodiment, a fastener A used for a battery terminal of an automobile battery is illustrated. The fastener A is as shown in FIG. 2 and includes a bolt 1 and a nut 3.

The bolt 1 is formed of a rectangular head 7 and a screw shaft 2 projecting from the center of the head 7. An annular engagement groove 5 is formed in the shaft end of the screw shaft 2 over the entire periphery thereof, and an E-ring 6 can be mounted therein. E-ring 6 is nut 3
The nut 3 is assembled to the engagement groove 5 after the mounting, and the outer diameter 6a is formed to be larger than the hole diameter 3b of the nut 3, thereby engaging the nut 3 to prevent the nut 3 from dropping off. . The battery terminal 8 is attached to an electrode of a battery (not shown), and is used for electrically connecting the electric wire (not shown) to the battery.

At the front of the battery terminal 8, a cylindrical portion 9 for holding the electrode is provided so as to bend along the periphery of the electrode, and both free ends of the cylindrical portion 9 are connected to a pair of fastening legs 12a.
It has become. Each tightening leg 12 has a bolt hole 10 for mounting the bolt 1. When the bolt 1 is inserted into the bolt hole 10 and tightened by the nut 3, the two tightening legs 12 approach each other, and the cylindrical portion 9
Is deformed in the ring closing direction, so that the battery terminal 8
Can be fixed to the electrode. Battery terminal 8
A barrel portion 11 for crimping the electric wire is disposed at a rear portion of the barrel.

Next, the operation and effect of the first embodiment configured as described above will be described. Prior to connection to a battery (not shown), the battery terminal 8 is assembled with bolts 1 and nuts 3 as shown in FIG. 1, and in this state, the battery terminal 8 is carried to the site of connection to the battery. At this time, as described above, since the E-ring 6 is fitted into the engagement groove 5 of the bolt 1, vibration is transmitted to the nut 3 during the loading, and the nut 3 moves in a direction in which the nut 3 retreats. However, further retraction is restricted by the E-ring 6, and there is no possibility of falling off. Therefore, the nut 3 is not lost or re-attached, and the efficiency of the operation can be improved.

<Second Embodiment> FIGS. 4 and 5 show a second embodiment of the present invention. The difference between the present embodiment and the first embodiment is only the retaining member for the nut.

In the second embodiment, a cap 13 made of resin is used as a retaining member attached to the engaging groove 5. A plurality of projections 14 that engage with the engagement grooves 5 are provided at appropriate intervals inside the cap 13. The outer diameter 13 a of the cap 13 is formed larger than the hole diameter 3 b of the nut 3. Even if the cap 13 configured as described above is fitted into the engagement groove 5, the same effects as in the first embodiment can be obtained as shown in FIG.

<Third Embodiment> Next, a third embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the only difference from the first and second embodiments is the structure of the bolt insertion end portion. FIG. 6 shows a state in which the fastener 17 including the bolt 15 and the nut 3 according to the present embodiment is attached to the battery terminal 8.

At the end of the screw shaft 2 in the bolt 15,
A split groove 18 is provided from the end face along the axial direction. By providing the split groove 18, the screw shaft 2 is slightly opened in a natural state (see FIG. 7), thereby preventing the nut 3 passing therethrough from returning. However, when the nut 3 passes through the portion where the split groove 18 is provided, the nut 3 is forcibly bent in the direction of closing the leg, but when the nut 3 is screwed in, the screwing starts smoothly. As described above, the outer surfaces of the leg ends are each formed with a tapered surface 19 that is tapered.

The depth of the split groove 18 is appropriately adjusted according to the depth of the insertion hole 3a of the nut 3 and the condition of the tool to which the bolt 15 and the nut 3 are attached. It is sufficient that the nut 3 is provided to such an extent that the nut 3 can be prevented from falling off from the screw shaft 2.

Next, the operation of the third embodiment configured as described above will be described. The bolt 15 is passed through the bolt hole 10 of the battery terminal 8, and the nut 3 is temporarily assembled while deforming the split groove 18 in the closing direction. At this time, the screwing of the nut 3 is smoothly started by the tapered surface 19 provided at the end of the screw shaft 2. When the nut 3 is displaced beyond the leading end of the split groove 18, the screw shaft 2 is returned to a state in which the leg 3 is slightly opened by the split groove 18, so that the nut 3 is prevented from falling off from the bolt 15. For this reason, the same operation and effect as those of the first and second embodiments can be exhibited. Further, since the E-ring and the resin cap are not used, the number of parts is reduced, which is advantageous from the viewpoint of cost and management.

<Fourth Embodiment> Next, a fourth embodiment of the present invention will be described with reference to FIG. In the present embodiment, the difference from the third embodiment is only the end portion of the screw shaft. A cut-and-raised portion 21 is provided at the insertion end 23 of the screw shaft 2 of the bolt 20 of the present embodiment. The cut-and-raised portion 21 is provided with a hole portion 22 in which the flesh is slightly left in the vertical direction with respect to the screw shaft 2, and the remaining flesh portion is cut and raised by pressing so that the insertion end 23 side becomes the base. (It may be extruded from the hole 22 side). However, the cut-and-raised portion 21 only needs to be able to realize a slight hook on the nut 3, and can be elastically deformed so as to fall down when the nut 3 passes and return after passing through the nut 3. It does not prevent screwing.

When the nut 3 is fitted into the bolt 20 configured as described above, the nut 3 starts engaging from the base of the cut-and-raised portion 21. When the nut 3 rotates in the tightening direction, the nut 3 moves forward so as to tilt the cut-and-raised portion 21. However, once the nut 3 exceeds the cut-and-raised portion 21, the cut-and-raised portion 21 rises up with elasticity. For this reason, the nut 3 cannot rotate in the opposite direction, that is, the direction in which the nut 3 comes off, and
It functions as a retaining device. The other configurations, functions and effects are almost the same as those of the third embodiment.

<Fifth Embodiment> Next, a fifth embodiment of the present invention will be described with reference to FIG. In this embodiment, the only difference from the other embodiments is the end of the screw shaft, and therefore, the same portions are denoted by the same reference numerals and description thereof will be omitted. In the screw shaft 2 of the bolt 25 shown in FIG. 9, no screw thread is formed in the middle near the shaft end, and the retaining shaft portion 2 has a reduced shaft diameter.
7 are arranged. Therefore, the nut 3 once passes through the first screw shaft portion 35 formed at the shaft end of the screw shaft 2, reaches the retaining shaft portion 27, and is screwed from there again to form the second screw shaft portion 36. To reach. In addition,
The length of the retaining shaft 27 is set slightly longer than the length of the nut 3.

When the nut 3 is inserted from the first screw shaft portion 35 into the screw shaft 2 of the bolt 25 thus configured, first, the thread at the end of the screw shaft 2 and the screw of the nut 3 engage. The nut 3 moves in the direction of the retaining shaft 27. When the nut 3 is further advanced to pass through the retaining shaft 27, the length of this portion is longer than the length of the nut 3. The screw shaft portion 36 is carried in a state where it is screwed again (temporarily fixed).

In the state where the bolt 25 and the nut 3 are temporarily fixed as described above, the nut 3 is prevented from coming off even if it receives vibration.
Although it falls into 7, it does not fall through the first screw shaft 35. Therefore, the situation where at least the nut 3 is lost can be avoided.

<Other Embodiments> (1) FIGS. 10 and 11 show other embodiments of the present invention. In this embodiment, the screw shaft 2 of the bolt 28 is used.
A female screw portion 29a is provided on the end surface on the insertion end 29 side into which the nut 3 is inserted.
A flat head screw 30 having a circular head 30a having a diameter 31 larger than a is screwed.

[0025] Even in such a configuration, when the bolt 28 and the nut 3 are temporarily fixed, the countersunk screw 30 is connected to the female screw portion 2.
By tightening the nut 9a, the nut 3 can be prevented from falling off. The female screw portion for retaining may be provided not in the end face but in a direction crossing the screw shaft 2 vertically. In that case, the retaining screw does not need to be a flathead screw,
It is sufficient that at least one end of the retaining screw protrudes from the screw shaft 2.

The present invention is not limited to the above-described embodiment. In short, it is only necessary to provide a nut stopper after the bolt and the nut are temporarily fixed. Further, in the present embodiment, the fastener of the present invention is applied only to the battery terminal. However, the present invention is rich in versatility, and the use range is not limited to those of these examples.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a fastener is attached to a battery terminal in the first embodiment.

FIG. 2 is a perspective view showing a fastener before assembly in the embodiment.

FIG. 3 is a side sectional view showing a state in which a fastener is attached to a battery terminal in the embodiment.

FIG. 4 is a perspective view of a retaining cap according to a second embodiment.

FIG. 5 is a side sectional view showing a state in which a retaining cap is attached to a fastener in the embodiment.

FIG. 6 is a perspective view showing a fastener in the third embodiment.

FIG. 7 is a side sectional view showing a state where the fastener is attached to the battery terminal in the embodiment.

FIG. 8 is a side sectional view showing a state where a fastener is attached in the fourth embodiment.

FIG. 9 is a side sectional view showing a state where a fastener is attached in the fifth embodiment.

FIG. 10 is a perspective view showing a fastener in another embodiment.

FIG. 11 is a side sectional view showing a state where the fastener is attached in the embodiment.

FIG. 12 is a perspective view showing a state in which a conventional fastener is attached to a battery terminal.

[Explanation of symbols]

 1, 15, 20, 28 ... bolt 2 ... screw shaft 3 ... nut 5 ... engagement groove (retaining part) 6 ... E-ring (retaining part) 13 ... cap (retaining part) 18 ... split groove (retaining part) 19) Tapered surface 21 Cut-and-raised (retaining part) 27 ... Retaining groove (retaining part) 29a ... Female thread part (retaining part) 30 ... Countersunk screw (retaining part) A, 17 ... Fastener

Claims (3)

[Claims] 1. A fastener comprising: a bolt; and a nut screwed into a screw shaft of the bolt, wherein the screw shaft is provided with a retaining portion for the nut. 2. The nut retaining portion according to claim 1, wherein the retaining portion of the nut is provided with a split groove along an axial direction from an end surface of the screw shaft, and the end of the screw shaft in a natural state is provided. A fastener characterized in that the nut is prevented from coming off by opening the legs in a spread manner. 3. The fastener according to claim 2, wherein a tapered surface for guiding screwing of the nut is formed on an outer surface of a leg end of the screw shaft.