JPS59151611A - Nut with washer and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nut with a washer that enables uniform fastening, and a method for manufacturing the same.

In conventionally proposed nuts with washers, a ring-shaped protrusion protruding from the nut seating surface is inserted into a hole drilled in the center of the washer, and this protrusion is crimped onto the circumference of the hole in the washer. It is crimped together so that it is held together or held together. Therefore, this method has the drawback that a step is created at the clamping portion of the washer, and even if the washer is clamped, the entire seating surface of the washer cannot be brought into contact.

In view of this, the present invention provides a device in which the entire bearing surface of the washer is pressed to ensure long-term contact with the object to be fastened, and is particularly suitable for long-term electrical fastening. It is.

The present invention will be explained below based on the illustrated embodiment 1. In the figure, A is a nut, and this seat surface 1 has a nut main body 2.
A circular protrusion 6 with a relatively small diameter is integrally formed, and the circular protrusion 6 is determined to have a length necessary for mounting the washer and a diameter smaller than the nut body.

A ring-shaped protruding edge 4 is formed on the bottom surface of the circular protruding portion 6, and this is formed so as to be easily caulked in a later step. For example, the outer circumferential surface is flush with the circular protrusion 3, but the inner circumferential surface is a tapered surface with a tapered tip.

Further, B is a washer made of the same material as the nut body or a different material, but as shown in Fig. 1, this has a bolt insertion hole 5t'' in the center by press working in advance, and its outer periphery is the same as that of the nut body or a different material. A flat seat surface 6 is formed so as to have a contact area, and a holding circumferential piece 7 is formed on the outer periphery of this seat surface so that the tip thereof is tapered, and the inner diameter of this ring-shaped holding circumferential piece 7 is The outer diameter of the circular protrusion of the aforementioned nut is slightly larger than the hole D', and the diameter of the inner corner of the continuous connection between the seat surface and the holding circumferential piece is set to be larger than the inner hole diameter of the holding circumferential piece. The diameter D is set so that the diameter D is also large, and there is still some room even when the protrusion edge 4 is caulked.This relationship is expressed by the formula %.
The circular protrusion 6 protruding from the center of the seat surface of the nut is pushed into the holding peripheral piece of the washer. At this time, the diameter of the inner hole of the holding circumferential piece is slightly larger than the diameter of the circular protrusion, so insertion is easily performed. Next, by pressing or hitting the upper part of the nut, the material of the protruding edge 4 is deformed due to its cross-sectional shape, and the tip is bent in the outer circumferential direction, forming a flange 4a on the outer circumference of the circular protrusion. The outer diameter Y of this flange 4a is larger than the aforementioned D' and smaller than D''. By preventing the tip of the holding peripheral piece from coming into pressure contact with the nut seating surface even when the protruding edges are caulked, washer B can be attached to the nut but will not rotate together with the nut.In other words, the nut will It shall be able to rotate freely relative to the washer.

The nut on which the washer is attached can be arbitrarily selected from a short nut to a long nut, and a nut with a ring-shaped groove 8 formed on the outer periphery of the center or upper end, or other shapes can be freely selected and applied. It is something. ,
.

According to the present invention, the lower part of the nut is held against the nut seat side, the washer is folded up, and the nut is struck. Since the washer is installed in a movable manner, the bottom surface of the washer is flat and there is no difference in level between the nut and the washer as in the conventional case, so there is no need for contact with the washer when making electrical connections. The area has the advantage of being able to secure the area as designed and allowing good fastening to the object to be compressed.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view before mounting on the washer tube nut, Fig. 2 is an explanatory view during mounting, Fig. 6 is a sectional view of the completed product, and Fig. 4 is a diagram of a different embodiment. A... Nut B... Washer 1... Seat surface 2... Nut body 6... Seat surface 4... Protrusion edge 4a... Flange 5... Bolt insertion hole 6.・・Seat surface 7・・・Holding circumferential piece 8・・Groove Patent applicant: Fuserashi Co., Ltd. Agent Kiyoaki Hayashi) @1M ・・Fig. 17 □D−

Claims (5)

[Claims] (1) A nut has a circular protrusion with a smaller diameter than the nut body formed in the center of the nut seat surface, and a ring-shaped protrusion edge with an arrow-pointed tip is integrally formed on the lower surface of this circular protrusion, and the outer periphery is The nut has a holding circumferential piece that is inclined inwardly and has a flat seat surface, and the circular protrusion tO of the nut.
A nut with a washer that is fitted into a BM+ washer, presses the upper part of the nut, bends the protruding edge into a flange-like shape inside the holding circumferential piece, and allows the washer to rotate freely. (2) A nut with a washer according to claim 1, wherein the nut is short. (3) A nut with a washer according to claim 1, in which the nut is a long nut. (4) A nut with a single washer according to claim 1, which uses a nut having a ring-shaped groove formed on the outer periphery of the nut. (5) A circular protrusion smaller in diameter than the nut body is formed in the center of the nut seat, and a ring-shaped protrusion edge with a pointed tip is integrally formed on the lower surface of the circular protrusion. The nut has an upwardly sloping holding circumferential piece that narrows inward on the outer periphery with the circular protrusion facing downward, and is fitted into a washer with a flat seat surface, and then the upper part of the nut is pressed. A method for producing a nut with a washer, characterized in that the protruding edge is made to protrude like a flange inside the holding peripheral piece, and the washer is freely rotated and attached to the nut to be integrated.