JPS6035571B2 - Bolt set with removable co-rotation prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bolt set equipped with a detachable co-rotation prevention device used for tightening automobile parts.

When attaching this kind of vehicle-operated parts, it is not always necessary to insert the bolt from above the member to be tightened and tighten the nut from below, or to attach the bolt and nut from both sides in the horizontal direction.
Bolts are often inserted and tightened from vertically or diagonally downwards. In such cases, hold a tool to hold the bolts in one hand to prevent them from falling off and rotating together, and use a tightening tool with a polygonal hole that fits the nut in the other hand to tighten each bolt one by one. It is too inefficient to tighten. Particularly in the case of automobile parts, which are mass-produced and often use a large number of bolts arranged in parallel at the same location, a means for efficiently attaching these bolts is required.

However, in the past, for example, after inserting a bolt into a member to be tightened, the polygonal head of the bolt was fixed by spot welding or arc welding to the member to be tightened, or as shown in Fig. After providing the flange portion 3× on the polygonal head 2×, insert this bolt IX into the rotation prevention member 12 provided with the polygonal hole 12a, and insert the polygonal head 2× protruding inside the bolt IX.
The x was integrated by caulking to prevent the bolt from holding and rotating together.

However, welding a bolt to a member to be tightened requires a large number of man-hours and does not improve tightening efficiency, and the bolt material becomes brittle due to the effects of heat from welding, resulting in a decrease in quality.

In addition, in the case of Fig. 1, the flange portion 3× and the rotation prevention member 1
2, the number and weight of parts increase, which increases costs, requires a large number of man-hours to manage the parts, and the anti-rotation member 12 remains attached even after tightening and cannot be reused. There were disadvantages such as material loss and increased weight.

The present invention has been made to solve the above-mentioned drawbacks, and by making the bolt and co-rotation prevention device removable, it is possible to securely hold the bolt and prevent co-rotation when tightening parts, and it also Afterwards, it can be easily separated from the bolt and used repeatedly for tightening the bolt, reducing total costs. It is also equipped with a removable co-rotation prevention device that allows multiple bolts installed in parallel to be inserted at the same time. The purpose is to provide bolt sets.

Embodiments of the present invention will be described below based on attached screens. First, to explain the structure, as shown in FIG. The head part 2 is integrally provided with an annular flange shape projecting from the outer surface of the head part 2, and the outer peripheral edge part 4 is formed into an arcuate surface that gradually tapers from the top to the bottom.

Further, B is a co-rotation prevention odor made of a metal material or a synthetic resin material, and a bolt attachment/detachment part is formed at each position that matches each hole 11a of the cord attachment member 11, and a bolt attachment/detachment part is formed between each bolt attachment/detachment part. are connected via the arm portion 5.

Each of these bolt attachment/detachment parts has a polygonal hole 6 and a counterbore hole 7 that can accommodate the square head 2 and locking plate 3 of the bolt A, respectively.
It is set in the shape of a lotus.

The depth of this counterbore hole 7 is such that a predetermined step is formed between the bottom surface of the locking plate 3 and the bottom surface of the locking plate 3 at the position where the top surface of the locking plate 3 supports the inserted bolt A. In addition, an annular groove 8 is provided on the inner peripheral wall surface of the counterbore hole 7.

When the bolt A is inserted to the position where the upper surface of the locking plate 3 comes into contact with the upper surface of the counterbore hole 7, this annular groove 8 fits the outer peripheral twill portion 4 of the locking plate 3 or is located below it. Formed on the inner peripheral wall surface. In the annular groove 8, a partially cut out annular elastic body 9 made of a wire spring, a plate spring, etc. is housed as a locking member in such a manner that it protrudes from the inner circumferential wall surface of the counterbore hole 7. It is configured such that the locking plate outer peripheral green portion 4 of the bolt A inserted to the upper limit of the hole 7 can be locked in an elastic state. Further, the height of the step is set at a height necessary so that when the bottom surface of the locking plate 3 is brought into alignment with the bottom surface of the co-rotation prevention device B, the locking member will be released from the locking.

Then, when the square head 2 of the bolt A is inserted under pressure into the polygonal hole 6 of each bolt attachment/detachment part of the co-rotation prevention device B, the locking plate 3
The outer periphery twill portion 4 presses the elastic body 9 outward of the annular groove 8 and is drilled, so that the upper surface of the locking plate 3 supports the bottom surface of the counterbore hole 7, and the elastic body 9 is formed into an arcuate surface. The bolt set is fixed in pressure contact with the outer peripheral green part 4, and is integrally and loosely attached to form a detachable bolt set with a co-rotation prevention mechanism.

When tightening each bolt A to the member to be tightened 11 using the bolt set with the above structure, a bolt attachment/detachment portion is formed at the same spacing position as each hole 1 1a of the member to be tightened 1 1 , Holding the co-rotation prevention tool B, in which the bolt A is installed in advance in each bolt attachment/detachment part, each hole 1 of the member to be tightened 1
When inserting each bolt A while aligning the tip of its shaft with 1a, each bolt A is elastically held against the co-rotation prevention device B, so it will not fall off even if inserted from below, and can be installed side by side. Multiple bolts can be inserted at the same time.

Then, when the nuts 10 are screwed together and tightened from the other side, the square head 2 of the bolt A acts as a rotation stopper because the iron is contained in the polygonal hole 6 of the anti-rotation B. ,
Since the bolts are connected to each other via the arm portion 5, the co-rotation prevention tool B itself does not rotate, so that it can be easily and reliably tightened by simply rotating the nut 10 without having to hold a special bolt. can.

Further, the step formed between the lower surface of the locking plate of the bolt A and the bottom surface of the co-rotation prevention device B gradually becomes smaller as the nut 10 is attached, so that the bottom surface of the locking plate 3 becomes the upper surface of the member to be tightened 11. When the tightening is completed, as shown in Fig. 3, the outer green part 4 of the locking plate 3 is below the position of the annular groove 8 and separates from the iron-plated elastic body 9 to release the engagement. , bolt A
The co-rotation prevention device B can be automatically removed when the rotation is completed.

Note that the removed co-rotation prevention odor B can be used repeatedly for the same tightening work by again setting the bolt A at each position of the polygonal hole 6 in the same manner as described above.

Next, in addition to the above-mentioned embodiments, the present application can take various modifications within the scope of the gist.

For example, the locking part made of an elastic body such as a wire spring or a plate spring, and the groove that collects the iron, do not necessarily have to be annular around the entire circumference. It is possible to create a locally arcuate groove or the like, and to set each locking part to a length that fits within the groove, or to provide spherical grooves in multiple places and install springs and steel as the locking part inside the groove. The ball may be contested in a manner that prevents it from escaping.

Furthermore, the locking plate is not shaped like a flange around the entire circumference as in the above embodiment, but has a plurality of projecting pieces 3a, 3b, 3c, and 3d protruding from the bottom of the square head 2, as shown in FIG. You can also
These locking plates can be molded integrally with the bolt, or can be molded separately and then attached integrally.

In addition, it is more desirable that the outer peripheral green portion of these locking plates, including those in the above-mentioned embodiments, be made into an arcuate surface in order to improve separation from the co-rotation prevention odor B. It can be used vertically without any modification. Further, in the above embodiment, bolt attachment/detachment portions are provided at two locations, but these are not limited to two locations, but may be provided at two or more locations and connected to each other via the respective arm portions. In addition to the linear arrangement, these may also be arranged in a triangular, square, or other arbitrary arrangement.

Further, a structure in which the arm part is provided with a mechanism for adjusting the length and the layers of each bolt attachment/detachment part are arbitrarily set are also within the scope of the present invention. As explained above, the present invention provides a bolt having a hexagonal or other polygonal head and a locking plate provided on the seat surface of the bolt square head that protrudes from the outer diameter of the square head, and a bolt that is attached to a member to be tightened. A plurality of bolt attachment/detachment parts are formed at predetermined spacing positions corresponding to the holes, each having a polygonal hole that fits the square head and a circular counterbore that fits the outer peripheral edge of the locking plate. A groove is provided on the inner wall surface of the counterbore hole to accommodate an elastically actuated locking member, and a co-rotation prevention device connects each bolt attachment/detachment part through an arm part, and the bolts rotate together. The locking member is removably inserted into the polygonal hole of the bolt attachment/detachment part in the polygonal hole of the bolt attachment/detachment part in such a manner that the locking member presses against the outer green part of the locking plate, and the bolt is inserted with iron. This is a bolt set with a removable locking plate that has a step for removal between the lower surface of the locking plate and the lower surface of the edge of the counterbore hole of the locking device. This makes it possible to simultaneously insert multiple bolts into each hole of a member to be tightened placed at any angle without the bolts falling out while stably holding the bolts, and to use individual co-rotation prevention tools. Since tightening can be done sequentially without any problems, the efficiency of tightening work can be greatly improved, and when tightening is completed, the co-rotation prevention device can be automatically separated from the bolt, allowing repeated use and reducing the weight of parts. I can do it.

In addition, this bolt set has the bolts installed in advance by a screw manufacturer before being delivered to the car, and can be delivered in this state, which has the effect of greatly reducing the number of man-hours required for parts management. play.

[Brief explanation of the drawing]

Fig. 1 is a detailed view showing how the bolt is prevented from rotating by caulking in a conventional example, Fig. 2 is a longitudinal sectional view showing a bolt set equipped with a removable co-rotation prevention device according to the present invention, and Fig. 3 is the same. A vertical cross-sectional view showing the manner of tightening with a bolt set,
FIG. 4 is a bottom view showing another embodiment of the locking plate. [Explanation of symbols] 1... Bolt, 2... Square head, 3
...Latching plate, 4...Outer green part, 5...Arm part, 6...
Polygonal hole, 7... Counterbore hole, 8... Annular groove, 9...
Elastic body, 10... Nut, 11... Member to be tightened, 1
1a... Hole. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A bolt with a hexagonal or other polygonal head, which is provided with a locking plate below the square head that protrudes from the outer diameter of the square head;
A bolt attachment/detachment part is provided concentrically with a polygonal hole that fits the square head and a circular counterbore hole that fits the outer peripheral edge of the locking plate at predetermined intervals that match the mounting holes of the member to be tightened. The bolt is formed at a plurality of locations, and includes grooves on the inner wall surface of the counterbore hole to house elastically actuated locking members, and a co-rotation prevention device that connects each bolt attachment/detachment portion with each other via an arm portion. ,
The bolt is removably inserted into the co-rotation prevention device in such a manner that the square head fits into the polygonal hole of the bolt attachment/detachment part, and the locking member presses against the outer peripheral edge of the locking plate, and A bolt set equipped with a removable co-rotation prevention tool, characterized in that a step for removal is provided between the lower surface of the edge of the inserted bolt.