JPH0594523U - Plain washer that does not fall off the screw - Google Patents

Abstract

(57) [Summary] [Purpose] This is a plain washer for a screw that does not fall off once tightened. [Structure] A flat washer (1) is provided with a knurl (3), a tongue (4), a notch (5), etc. on the inner circumference (2), which is bent inward or outward or in one direction. Configuration of plain washer (1).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This proposal concerns a flat washer that does not fall off the screw.

[0002]

[Technology of Rarai]

 Originally, the screw was a combination of a spring washer and a plain washer, and both washers were fitted into the male screw to tighten them. In recent years, a Sems machine has been developed, and male threads are manufactured with a rolling diameter, and spring washers and plain washers are automatically inserted into them, and they are automatically thread-rolled. To do this, if the inner diameter of the flat washer is made slightly smaller than the outer diameter of the male thread, and it is made slightly larger than the rolled diameter to form a rolled screw, the flat washer does not fall off, which is convenient for parts assembly and improves work efficiency it can.

[0003]

[Problems to be solved by the device]

 Since the screw processing by the Sems machine is processed by an automatic machine, it is necessary to produce a large quantity. It is profitable for screws used in the mass production industry such as automobiles and electric appliances, but it is not suitable for other mass production fields.

[0004]

[Means for Solving the Problems]

 This plan was devised as a plain washer in order to solve the above problems, and it is explained in the drawings. There are six types of flat washers: small round washers, polishing round washers, normal round washers, small square washers, and large square washers. There are various materials used such as steel, copper, brass and aluminum. A serrated (3) tongue (4) notch (5) and the like are formed on the inner circumference (2) of the flat washer (1). The present invention will be described by taking the serrated (3) as an example. Four serrated (3) are formed, the opposing serrated (3) is bent in the same direction, and the other serrated (3) is opposite to the former. Bend in the direction. That is, it bends inward and outward. When a large number of even numbers are formed continuously on the inner circumference (2) of the flat washer (1), the notches (3) are alternately bent in the same direction. Further, the notches (3) may be bent only in the same direction. The distance between the notches (3) and the notches (3) facing each other, that is, the diameter is as follows. The dimension before bending should be slightly smaller than the outer diameter of the male thread (6), and the dimension after bending should be slightly larger than the outer diameter of the male thread (6). The male screw (6) is a material with a rolled diameter, and is thread-rolled under the neck of the head (7), leaving a portion of the blank where no screw is rolled.

[0005]

[Action]

 Since the present proposal has the above-mentioned configuration, if the plain washer (1) is fitted into the male screw (6) and tightened, the notch (3) of the plain washer (1) is the head of the male screw (6). It is clamped between the back of the neck of (7) or the surface of the spring washer (8) and the fastening part (9), and the bent part of the notch (3) is restored to the shape before being bent. Therefore, the flat washer (1) does not thread-roll the rolled diameter, stays in the blank portion, and does not fall off the screw (6).

[0006]

【Example】

 First embodiment

1]

FIG. 2 is a first embodiment. Form four serrations (3) on the inner circumference (2) of the flat washer (1), bend the opposing serrations (3) in the same direction, and place the other opposing serrations (3) in the opposite direction from the former. Bend in the direction. The size of the gap between the notch (3) and the facing notch (3) is slightly smaller than the outer diameter of the male screw (6) before bending, and the dimension after bending is the outer diameter of the male screw (6). Bend a little more than Second embodiment,

FIG. 3 is a second embodiment. An even number of knurls (3) are formed on the inner circumference (2) of the flat washer (1), and the knurls (3) are bent alternately in the same direction. In other words, it will be skipped one by one and bent in the same direction. The size of the notch (3) is the same as that of the first embodiment. Third embodiment

FIG. 4 shows a third embodiment. A tongue (4) is formed on the inner circumference (2) of the flat washer (1). Even numbers may form multiple tongues (4). The bending direction and the distance between the tongues (4) are the same as in the first and second embodiments. Fourth embodiment,

FIG. 5 is a fourth embodiment. A large number of notches are formed on the inner circumference (2) of the flat washer (1). The bending direction and the dimension of the space are the same as in the second embodiment. Fifth embodiment,

FIG. 6 is a fifth example. A flat washer (1) is provided with a notch (3), a tongue (4) or a notch (5) on the inner circumference (2), and all of them are bent in the same direction.

[0007]

[Effect of the device]

 Since the present proposal has the above-described configuration, when the male screw (6) is tightened, the notch (3) of the flat washer (1) is restored to the shape before the bending. For this reason, the flat washer (1) does not fall off, so that it does not fall off even if it is loosened or tightened many times, and there is no fear of losing the spring washer (8) and the plain washer (1).

[Brief description of drawings]

FIG. 1 is a diagram of a first embodiment. It is a top view of the flat washer (1) with a notch (3).

FIG. 2 is a diagram of a first embodiment. It is a side view of the flat washer (1) with a notch (3).

FIG. 3 is a diagram of a second embodiment. It is a top view before bending of the flat washer (1) with a notch (3).

FIG. 4 is a diagram of a third embodiment. It is a top view before bending of the flat washer (1) with a tongue (4).

FIG. 5 is a fourth embodiment showing a flat washer (1) with a notch (5).
FIG. 4 is a plan view before bending.

FIG. 6 is a side view of the fifth embodiment in which the notch (3) is bent in the same direction as an example.

FIG. 7 is a usage drawing of the flat washer (1) of the present invention.

[Explanation of symbols]

(1) is plain washer, (2) is inner circumference, (3) is serrated,
(4) tongue, (5) notch, (6) male thread,
(7) is the head, (8) is the spring washer, (9) is the fastening part

Claims (1)

[Scope of utility model registration request] 1. A flat washer having a serration, a tongue, and a notch formed on the inner circumference and bent inward and outward or in one direction.