JPH0710540U - Loose cap nut - Google Patents

Abstract

(57) [Summary] [Purpose] The load is evenly distributed over the entire axial length of the screw hole, stress concentration can be avoided, load restrictions can be relaxed, and a strong loosening effect can be obtained. (EN) Provided is a loose cap nut which can be manufactured by a simple and inexpensive process and has durability against wind and rain. [Structure] The exterior body (11) and the inner cylindrical screw body (12) are joined and integrated by a welding portion (19). The outer case and the inner cylindrical screw body are separately manufactured in advance, and then the outer body and the inner cylindrical screw body are manufactured by a very simple process in which they are joined and integrated by welding, and the bag-shaped portion can be easily formed in the outer body. The inner cylinder portion is provided with a loosening prevention portion (17b) which is deformed radially inward with respect to the true circle. By screwing the screw rod (20), the locking portion is deformed radially outward so that the inner cylindrical portion becomes a perfect circle, and the restoring force generates a pressure contact force against the screw rod, so that the screw of the inner cylindrical portion is screwed. The load can be evenly shared by the entire axial length of the hole, stress concentration can be avoided, and the load limit can be relaxed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a loose cap nut that does not loosen due to vibration or external impact after being screwed and fixed to a screw rod such as a screw or bolt, and that the load is evenly applied to the screw thread. It is about.

[0002]

[Prior art]

 Generally, most of the combined load when a nut is screwed and fixed to a screw rod such as a screw or bolt is concentrated on the screw thread near the inlet side coupling surface of the nut in the screw rod. Therefore, there is a problem that stress concentration occurs at the root of the screw thread and the load must be limited.

Therefore, the same applicant as the present application has filed an application for a loose nut that solves such a problem, and a perspective view of FIG. 5 showing this loose nut and FIG. A brief description will be given below with reference to the half-section cross-sectional view of the same used state and the plan view of FIG. That is, the loose nut (1) has a cylindrical inner cylindrical portion (2) which is provided with a female screw portion (2a) on the circumference and penetrates in the axial direction, and an end outlet (3) of the inner cylindrical portion (2). ) Is formed continuously at the other end while surrounding the inner cylindrical portion (2) through the radially outward curl portion (4) formed at (4), and a seat (6) is formed at the other end to project radially outward. The outer cylindrical portion (5) and the inner cylindrical portion (2) are formed at the other end inlet (7) side, and their curvature outer peripheral lower end (8a) is at the same level as the seat surface (6a) of the seat (6). The curl portion (8) in the set radial direction is provided, and the curl portion (8) is formed integrally with a relatively thin elastic metal plate such as a stainless steel plate. Incidentally, the outer circumference of the outer tubular portion (5) is formed in a hexagonal shape so that it can be fitted with a tool such as a spanner like a general nut.

In this loosening nut, the female screw part (2a) is screwed onto the male screw part (9a) of the screw rod (9) to firmly tighten the member to be tightened (10), and the seat (6 When the tightening member (10) is pressed by the seat surface (6a) of (1), the seat (6) formed at the other end of the outer tubular part (5) is similar to the flange of a general flanged nut. It works to prevent loosening. Further, at the time of fastening by fastening, the loose nut (1) is axially compressed by the binding load, and therefore the shaft is attached to the outer tubular portion (5) via the seat (6) which is slightly elastically expanded radially outward. A reaction force is generated in the direction, and this reaction force causes the inner cylinder part (2) through the curl part (8) to have the strongest force at the one end outlet (3) side and gradually decrease toward the other end inlet (7). The outer peripheral lower end of the outer peripheral curl (8) formed on the side of the other end inlet (7) of the cylindrical inner cylindrical portion (2) while being elastically contracted by being urged in the radial direction by (8a) interferes with the member to be tightened (10) to expand the diameter.

[0005]

[Problems to be solved by the device]

 Therefore, the loose nut (1) described above can obtain the following remarkable effects. That is, the elastic contraction increases the pressure contact force of the threaded rod (10) with respect to the male threaded portion (9a) to increase the loosening force. Further, the one end outlet (3) side is the strongest and the one end outlet (3) side is elastically contracted by urging radially inward with a force that gradually decreases toward the other end inlet (7). The load is also loaded on the threads of the female screw portion (2a) of the inner cylinder portion (2a), so that the load is evenly shared by the entire screw hole of the inner tubular portion (2), and the above-mentioned even distribution of the load is increased. Surely done.

The loose nut (1) is widely used in many fields because it has the extremely remarkable effect as described above, but the curl portion (7) at the other end is radially outward. 8) is provided with a relatively complicated shape in which the outer tubular portion (5) is integrated with the curl portion (4) so as to surround the inner tubular portion (2). Since it is formed by locally plastically deforming a relatively thin elastic metal plate such as a steel plate by press working, etc., the manufacturing process becomes relatively complicated and it is difficult to reduce the cost. Since it is integrally molded into a shape, it is not possible to form a bag-shaped part such as a cap nut. Therefore, when it is used outdoors, there remains a problem that it is easily deteriorated by wind and rain.

Therefore, the present invention is configured such that the load is evenly shared by the entire axial length of the screw hole, stress concentration can be avoided, the restriction of the load can be relaxed, and a strong loosening effect can be exerted. It is a technical subject to provide a loose cap nut that can be manufactured by a simple and inexpensive process and is durable against wind and rain.

[0008]

[Means for Solving the Problems]

 The present invention has a loose cap nut configured as follows as a technical means for achieving the above-mentioned problems. That is, it is a loose cap nut that is screwed into a screw rod such as a screw or a bolt to be fastened and fixed, and the other end opening portion of the outer cylinder part having a radially outward seat at one inlet end peripheral end portion. The outer body is made by molding a relatively high-elasticity metal thin plate into a shape in which the bag-like part is integrally formed in the lid state, and the internal thread part is engraved on the inner peripheral surface and part of the diameter is perfect circle. Inner cylindrical neck part formed of a relatively high-elasticity metal thin plate in a shape in which a radially outward flange part is formed on the inlet side at one end of a non-circular inner cylindrical part with a loosening prevention part that is deformed inward The outer cylinder part and the flange part fitted into the outer cylinder part are joined together by a welded part so that the exterior body and the inner cylinder screw part are integrated with each other.

[0009]

[Action]

 When the female thread portion is screwed into the male thread portion of the threaded rod, each of the locking portions deformed radially inward of the female thread portion is elastically expanded outward in the radial direction by the perfectly circular male thread portion of the thread rod. When the rod penetrates the inner cylindrical part, the inner cylindrical part is deformed into a perfect circle shape, and the restoring force generated by the deformation in the locking part causes the female screw part to strongly press in the radial direction against the male screw part of the threaded rod. , A high loosening force occurs. Since the pressure contact force in the radial inward direction is generated evenly over substantially the entire inner cylindrical portion, the load can be evenly shared by the entire axial length of the female screw portion. On the other hand, when tightening and fixing, the outer radial seat of the exterior body interferes with the tightening surface or washer of the member to be tightened, and elastically expands radially outward. Since the flange portion is also elastically expanded in the radially outward direction, it is possible to reliably prevent the load from concentrating on the inlet side end portion of the female screw portion. Further, since the outer body is provided with the bag-shaped portion (16), it is possible to obtain the same durability against wind and rain as a general cap nut.

[0010]

【Example】

 Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a half sectional view of an embodiment of the present invention, and FIG. 2 is a bottom view of the same. The loose cap nut of the present invention has a structure in which two members, an outer casing (11) and an inner cylindrical screw body (12), are integrally joined by welding. The outer casing (11) has an outer cylindrical portion (13) having a hexagonal outer periphery so that a tool such as a wrench can be fitted thereto, and one end side of the outer cylindrical portion (13) (see FIG. 1). (14) of the outer cylindrical portion (13) having a circular outer peripheral end and protruding radially outward from the other end of the outer cylindrical portion (13) to the outer cylindrical portion (13) through the step (15). The bag-shaped portion (16) continuously provided in the covered state is integrally formed by plastically deforming a metal sheet having a relatively high elasticity such as stainless steel by pressing or the like.

On the other hand, the inner cylindrical threaded body (12) is provided with a female threaded portion (17a) on the inner peripheral surface thereof, as clearly shown in FIGS. A relatively high-elasticity metal thin plate such as stainless steel is locally plasticized by pressing etc. into a shape in which a radially outward flange part (17) is extended at one inlet of the inner cylinder part (17) It is formed by deforming. The outer periphery of the flange portion (18) is formed in a hexagonal shape which is substantially the same as the inner peripheral surface of the outer tubular portion (13) of the outer casing (11). As shown in FIG. The outer cylindrical portion (13) is fitted and both are firmly and integrally joined by a welded portion (19) by laser welding or the like. In addition, the inner cylindrical portion (17) is formed in advance into a cylindrical shape of a perfect circle, and then two sets of two mutually facing portions are drawn and plastically deformed radially inward to prevent the loosening prevention portion (17b). ) Is formed, and therefore has a non-circular tubular shape as a whole, and only the facing portion of the flange portion (18) of the female screw portion (17a) has a perfect circular shape. Then, as shown in FIG. 1, a portion of the outer periphery of the other end of the inner tubular portion (17) excluding the loosening prevention portion (17b) is joined to the inner surface of the stepped portion (15) of the exterior body (11).

In the above-mentioned structure, as shown in FIG. 4 showing the plane of only the inner cylinder screw body (12), when the female screw part (17a) is screwed into the male screw part of the screw rod (20), Each of the locking portions (17b) of the female screw portion (17a) is elastically expanded radially outward by the perfect circular male screw portion of the rod (20), and the screw rod (20) penetrates the inner cylindrical portion (17). At that time, the inner cylinder part (17) is deformed into a perfect circular shape as shown in FIG. 4, and as shown by the arrow in the figure, the restoring force generated by the deformation at each loosening prevention part (17b) is caused. The female threaded portion (17a) is strongly pressed radially inward with respect to the male threaded portion of the threaded rod (20), and a high loosening force is generated. On the other hand, since the above-mentioned pressure contact force in the radial inward direction is evenly generated over substantially the entire portion of the inner tubular portion (17) except for the facing portion of the flange portion (18), the screw hole, that is, the female screw portion (17a). The load can be evenly distributed over the entire axial length of.

Moreover, the end portion on the inlet side of the female screw portion (17a) where the load is concentrated in a general nut is originally formed into a perfect circular shape because the flange portion (18) is formed on the outer peripheral portion. Therefore, the pressure contact force in the radial direction as described above does not occur. Further, when tightened and fixed, the radially outward seat (14) of the exterior body (11) interferes with the tightening surface or washer of the member to be tightened, and is slightly elastically expanded radially outward. The flange portion (17), which is integral with 14) and the welded portion (19), is also elastically expanded radially outward. As a result of the functions or actions of these two points, it is possible to reliably prevent the concentration of the load on the one end inlet side portion of the female screw portion (17a). That is, it is possible to obtain the same function as the loose nut (1) shown in FIGS. 5 to 7 described above, and in addition, since the outer casing (11) is provided with the bag-shaped portion (16), It is possible to obtain the same weather resistance as a conventional cap nut.

In manufacturing this loose cap nut, the exterior body (11) and the inner cylindrical screw body (12) are separately produced in advance, and then these are joined by welding to be an extremely simple process. Since it can be manufactured through the above, the manufacturing cost can be significantly reduced. In addition, the bag-shaped portion (16) can be easily formed integrally with the exterior body (11) which is formed separately from the inner cylinder screw body (12).

[0015]

[Effect of device]

 As described above, according to the loose-fitting cap nut of the present invention, the outer body and the inner cylindrical screw body are combined and integrated by the welded portion. Since it can be manufactured through an extremely easy process of joining and integrating them by welding after pre-manufacturing, the manufacturing cost can be significantly reduced and the bag-shaped part can be easily formed on the exterior body. Since it can be formed, it is possible to obtain the same weather resistance as a general cap nut. Moreover, the inner cylinder is provided with a loosening prevention part that is deformed radially inward with respect to a perfect circle, and the loosening prevention part is deformed radially outwardly so that the inner cylinder becomes a perfect circle by screwing a screw rod. Since it is configured to generate a pressure contact force against the threaded rod by the restoring force, the load is evenly distributed by the entire axial length of the screw hole of the inner cylinder to avoid stress concentration and relax the load limit. The effect of obtaining the function can be retained.

[Brief description of drawings]

FIG. 1 is a half sectional view of an embodiment of the present invention.

FIG. 2 is a bottom view of the same.

3 (a) and 3 (b) are a plan view and a vertical cross-sectional view of an inner cylindrical screw portion of the same main portion as above.

FIG. 4 is a plan view of the inner cylindrical screw part of the main part in the same state as above.

FIG. 5 is a perspective view of a conventional loosening nut.

FIG. 6 is a semi-cut sectional view of the same as above.

FIG. 7 is a plan view of the same.

[Explanation of symbols]

 11 Exterior body 12 Inner cylinder screw body 13 Outer cylinder part 14 Seat 16 Bag-like part 17 Inner cylinder part 17a Female thread part 17b Loosening prevention part 18 Flange part 19 Welding part

Claims (1)

[Scope of utility model registration request] 1. A loose cap nut that is screwed and fixed to a screw rod such as a screw or a bolt, wherein the other end of the outer cylinder portion is provided with a radially outward seat at the one end inlet side peripheral end portion. An outer body formed of a relatively high-elasticity metal thin plate in a shape in which a bag-shaped portion is integrally formed in the opening in a covered state, and a female screw portion is engraved on the inner peripheral surface and part of a perfect circle An inner cylinder screw formed of a relatively highly elastic thin metal plate in a shape in which a radially outward flange portion is formed on the inlet side at one end of an inner cylinder portion having a non-circular cross section A loose cap nut, wherein the outer cylinder part and the flange part fitted into the outer cylinder part are joined by a welded part so that the exterior body and the inner cylinder screw part are integrated with each other. ..