JP2004308862A - Washer incorporated nut - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a washer incorporated nut with a washer locked and held to the nut in a stably rotatable manner, wherein the washer having a tongue piece extending to the inside of a screw shaft insertion hole can be incorporated into the nut. <P>SOLUTION: An outward expanding hem portion 17 is provided on a cylinder portion 14 protruded on a seat surface 3 of the nut 11 concentrically with a screw hole 12, while a plurality of locking pawls 18 are radially provided on the peripheral edge of the screw shaft insertion hole 16 of the washer 15, extending to the center thereof. A pawl end diameter A of the locking pawl 18 is set larger than an outer diameter d of the cylinder portion and smaller than an outer diameter D of the hem portion. The locking pawl 18 is bent upward until its pawl end diameter B is larger than the outer diameter D of the hem portion 17, and the washer 15 is fitted to the cylinder portion 14 and the locking pawl 18 is pushed back into an original horizontal attitude and locked and held to the hem portion 17. Thus, the washer 15 is rotatably assembled on the nut 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a washer-incorporated nut in which a washer is rotatably incorporated in a nut.
[0002]
[Prior art]
As shown in FIG. 8 (a), the most typical conventional washer-incorporated nut has a short cylindrical portion 4 protruding from the seat surface 3 of the nut 1 concentrically with the screw hole 2 and slightly smaller than the cylindrical portion 4. After fitting a washer 5 having a screw shaft insertion hole 6 having a large hole diameter to the outside, as shown in FIG. 8B, the open end of the cylindrical portion 4 is swaged by a swaging tool 8 to remove the flared portion 7 of the outside expansion. The washer 5 is locked and held by the skirt 7, the washer 5 is incorporated into the nut 1, and the degree of caulking by the caulking tool 8 is adjusted to keep the washer 5 rotatable with respect to the nut 1. ing.
[0003]
[Problems to be solved by the invention]
However, in the above-mentioned conventional washer-incorporated nut, the shape and dimensions of the outer skirt portion 7 are not constant due to variations in the height of the cylindrical portion 4 and variations in caulking deformation caused by the caulking tool 8, so that the washer 5 with respect to the nut 1 is not fixed. There has been a problem that locking and rotation become unstable. In addition, if the washer 5 has a protrusion such as a tongue extending to the inside of the screw shaft insertion hole 6, it becomes impossible to caulk the cylindrical portion 4 with the caulking tool 8, and such a washer is attached to the nut. Could not be incorporated.
[0004]
The present invention has been made in view of the above-described problems, and the locking and holding and rotation of the washer with respect to the nut are stable, and the washer having a tongue piece extending to the inside of the screw shaft insertion hole can be assembled to the nut. It is an object to provide a possible washer built-in nut.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the washer-incorporated nut of the present invention is provided with a flared portion extending outward on a cylindrical portion protruding concentrically with a screw hole on the seat surface of the nut. A plurality of locking claws extending toward the center are radially provided on the periphery of the claw, and the claw tip diameter A of the locking claw is larger than the outer diameter d of the cylindrical portion and smaller than the outer diameter D of the skirt portion. The washer is fitted to the cylindrical portion in a state where the locking claw is bent and raised to have a claw tip diameter B larger than the outer diameter D of the hem portion, and the locking claw is returned to the original horizontal posture. The washer is rotatably assembled to the nut by being pushed back into the hem portion to be locked and held.
[0006]
In the above-described configuration, the flared portion of the nut provided on the cylindrical portion of the nut can be processed with stable dimensional accuracy by cutting or pressing. Further, since the pressing force for returning the locking claw of the washer fitted to the cylindrical portion to the original horizontal position is extremely smaller than the conventional caulking pressure, the work of assembling the washer can be easily performed.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0008]
FIGS. 1 and 2 show a washer-incorporated nut according to the present invention, which is composed of a nut 11 and a washer 15 rotatably assembled to the nut 11.
[0009]
As shown in FIG. 3, the nut 11 has an annular skirt 17 formed at the opening end of a cylindrical portion 14 protruding from the seating surface 13 concentrically with the screw hole 12. The skirt portion 17 can be processed by pressing with a molding die 9 as shown in FIG. 3A or by cutting as shown in FIG. The outer diameter d of the cylindrical portion 14 and the outer diameter D of the flared portion 17 are finished to predetermined dimensions.
[0010]
As shown in FIG. 4, the washer 15 is manufactured by punching a thin metal plate, and a screw shaft insertion hole 16 having a diameter larger than the outer diameter D of the outer spreading skirt 17 of the nut 11 is provided in the center portion. A plurality (five in the illustrated example) of locking claws 18 extending toward the center are radially protruded from the peripheral edge of the insertion hole 16, and a contour circle formed by the tip edges 18 a of these locking claws 18. The diameter A of the (virtual circle) (referred to as a claw tip diameter) is set to be larger than the outer diameter d of the cylindrical portion 14 and smaller than the outer diameter D of the skirt portion 17. The washer 15 is formed by punching a tongue piece 19 that is bent to the back side and extends toward the center to the inside of the insertion hole 16, and an annular protruding edge 20 that is bent downward and extends on the outer peripheral portion. I have. The tongue piece 19 and the annular protruding edge 20 are provided so as to be adapted to the use described later. The washer according to the present invention is not only such a special washer but also a general flat washer and a disc spring washer. You may.
[0011]
Next, the washer 15 manufactured as described above bends and raises each locking claw 18 toward the seat surface 13 side of the nut 11 as shown in FIG. Preliminary processing is performed so as to be larger than the outer diameter D of the skirt edge 17. After fitting the insertion hole 16 of the washer 15 thus pre-processed into the cylindrical portion 14 of the nut 11, the locking claw 18 is pushed back to the original horizontal position along the seat surface 13, and the claw tip diameter A Therefore, the leading edge 18a of each locking claw 18 is locked and held by the annular skirt 17, and the washer 15 is rotatably mounted on the nut 11 as shown in FIGS. Is completed.
[0012]
6 and 7 show an example of use of the washer-incorporated nut according to the present invention described above. A key groove 24 for engaging the tongue piece 19 of the washer 15 is provided in the shaft end screw portion 23 of the shaft 21 to which the gear 22 is fitted, and when the nut 11 is screwed into the shaft end screw portion 23, The tongue 19 of the washer 15 is engaged with the key groove 24. When the nut 11 is screwed into the shaft end screw portion 23 and screwed in, the tongue 19 of the washer 15 assembled to the nut 11 is guided along the key groove 24 and moves toward the shaft 21 in a non-rotating state. The nut 11 is fastened and fixed at a position where the annular protruding edge 20 of the washer 15 contacts the side surface of the gear 22.
[0013]
【The invention's effect】
As described above, in the washer-incorporated nut according to the present invention, the locking and holding and rotation of the washer with respect to the nut are stable, and at the time of assembly, the locking claw provided on the washer is pushed back to the original horizontal position. Since the pressure is extremely smaller than the conventional caulking pressure, the work of assembling the washer can be easily performed.
[0014]
Also, a specially shaped washer having a tongue piece extending to the inside of the screw shaft insertion hole can be incorporated into the nut.
[Brief description of the drawings]
FIG. 1 is a central longitudinal sectional front view of a washer built-in nut according to the present invention.
FIG. 2 is a bottom view of the nut with a built-in upper washer.
FIGS. 3A and 3B are longitudinal front views of the same nut alone, in which FIG. 3A shows an example of press working, and FIG. 3B shows an example of cutting work.
4A and 4B show the upper washer alone, wherein FIG. 4A is a longitudinal sectional front view, and FIG. 4B is a bottom view.
5A and 5B show a single washer which has been pre-processed in the above, wherein FIG. 5A is a longitudinal front view and FIG. 5B is a bottom view.
FIG. 6 is a vertical sectional front view of an essential part showing an example of use of a washer-incorporated nut according to the present invention.
FIG. 7 is a plan view of the same.
8A and 8B show a conventional washer-installed nut, wherein FIG. 8A is a longitudinal sectional front view of the nut and the washer before being assembled, and FIG. 8B is a longitudinal sectional front view showing an assembled state.
[Explanation of symbols]
11 Nut 12 Screw Hole 13 Seat 14 Cylindrical Part 15 Washer 16 Screw Shaft Insertion Hole 17 Bottom 18 Locking Claw 18a Tip Edge 19 Tongue Piece 20 Annular Protrusion A Claw Tip Diameter B of Locking Claw 18 Outside of Bottom 17 Claw tip diameter larger than diameter D

Claims (2)

An outer skirt is provided on the cylindrical portion that protrudes concentrically with the screw hole on the seat surface of the nut,
On the other hand, a plurality of locking claws extending toward the center are radially provided on the periphery of the screw shaft insertion hole of the washer, and the claw tip diameter A of the locking claw is larger than the outer diameter d of the cylindrical portion, and the hem portion Is set to be smaller than the outer diameter D of
By fitting the washer into the cylindrical portion in a state where the locking claw is bent and raised to have a claw tip diameter B larger than the outer diameter D of the hem portion, and pushing the locking claw back to the original horizontal position, A washer-incorporated nut characterized in that the washer is rotatably assembled to the nut while being held and held by a skirt. 2. The nut according to claim 1, wherein the washer has a tongue extending to the screw shaft insertion hole.

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