JPH0137211Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a plastic collar nut for fixing a plate-like structural member to a threaded weld stud welded to a metal plate, and in particular, the collar nut penetrates through the collar nut in the axial direction and has a diameter A collar nut with a hole smaller than the outer diameter of a threaded weld stud and a butt flange with a flat end face perpendicular to the axis of the hole.

(Prior art and its problems) To provide a plastic nut having a circular or trilateral smooth hole or a hole with longitudinal ribs, which is press-fitted into a threaded bolt welded to a metal plate. is well known. Such fasteners can be secured by rotating a nut and screwing it, but their resistance to dislodgement due to axial forces is often not very high.

OBJECTS OF THE INVENTION It is an object of the invention to form a collar nut in such a way that it is held particularly firmly by a welding stud.

(Structure of the invention) According to the invention, the above object is such that the hole wall at the end facing the structural member is elastically deformable and extends in a radial direction protruding beyond the end face of the butt flange and is arranged symmetrically. A groove is provided between each pawl and the outer surface of the collar nut, extending the length of the pawl and sloping toward the outer surface of the collar nut, with each pawl facing toward the structural member. This is achieved in that the abutment surfaces of the pawl form an outwardly opening acute angle with respect to the structural member.

By forming angled elastically deformable pawls, when the collar nut is screwed onto a threaded weld stud, the acute angle formed by the abutment surfaces relative to the structural member causes each pawl to Due to the inward deformation, each pawl is pushed towards the threaded welding stud when its abutment surface abuts the plate-like structural member. As a result, not only does the deflection capacity of the pawl cause it to engage the threads of the threaded weld stud, but more importantly, the pressure exerted by the collar nut on the plate-like structural member during tightening causes the pawl to engage the threads of the threaded weld stud. Press-fitted. This causes the pawl to wedge against the thread with great force, holding the collar nut very firmly on the threaded weld stud.

(Example) Next, an example of the present invention will be described with reference to the attached drawings. Color nut 1 shown in Figures 1 to 4 is 6
It consists of a body 2, shown as rectangular, with a flat hole 3 extending axially through the body. For the fit with the threaded welding studs, the diameter of the hole 3 is slightly smaller than the outer diameter of the respective threaded welding stud, so that the collar nut 1 made of deformable synthetic resin, in particular plastic, is attached to the body 2 of the nut. It can be screwed onto a threaded welding stud by tapping the corresponding screw. The above is a well-known matter. This collar nut has butt flange 18
when each threaded welding stud secures the plate-like structural member to the welded metal plate, the butt flange 18 is positioned against the plate-like structural member and its flat end face 19 holds the structural member to the metal plate. Press against the plate.

The hole 3 is divided into two claws 4 and 5 located diametrically opposite each other at the end of the butt flange 18.
These pawls have shoulders 6, 7 located behind the thread ridges of the threaded weld stud. The claws 4, 5 are respectively located at the ends of two elastic arms 12, 13, which on the inside lie on the continuous surface of the hole 3 and on the outside thereof lie in the grooves 8, 8 in the body 2 and the flange 18. Bounded by 9. Since the claws 4 and 5 can be elastically bent radially outward by the grooves 8 and 9, the claws 4 and 5
A threaded welding stud inserted into the collar nut 1 from the side can push the claws 4, 5 outwards. This deflection is further facilitated in that the claws 4, 5 have bevels 10, 11 before insertion of their threaded welding studs. elastic arm 1
2 and 13 appear in the shape of a sector emerging from the wall of the hole 3 between the recesses 14 and 15 of the body 2 at the flange end 18.

(Effect of the invention) The two claws 4 and 5 are provided with two contact surfaces 16 and 17, and these contact surfaces 16 and 17 are screwed to the axis of the nut, and the nut is screwed to a flat structural member. In this case, the abutment surfaces 16, 17 first engage the structural member with their inner edges and are inclined at an outwardly open acute angle with respect to the structural member. Therefore,
When screwed in further after engagement, the pawls 4 and 5 bend radially inward and are wedged between the ridges of the threads of the threaded welding stud by the support pressure applied from the collar nut 1, respectively. As a result, the collar nut 1 is positioned very firmly on each weld stud and can withstand large axial pull-out forces.

[Brief explanation of drawings]

Figure 1 is a sectional view of the collar nut taken along the - line in Figure 3, Figure 2 is a sectional view of the collar nut taken along the - line in Figure 3, and Figure 3 is a plan view of the collar nut, with its butt flanges being FIG. 4, facing toward the back of the page, is a bottom view of the collar nut, with its abutment flange facing toward the front of the page. 1... Collar nut, 3... Hole, 4, 5... Tab, 8, 9... Groove, 16, 17... Contact surface, 18
...Butt flange.

Claims (1)

[Scope of utility model registration request] A collar nut for fixing a plate-like structural member to a threaded welding stud welded to a metal plate, a hole passing through the collar nut in the axial direction and having a diameter smaller than the outer diameter of the threaded welding stud;
a butt flange having a flat end face perpendicular to the axis of the hole, the hole wall at the end facing the structural member being elastically deformable and projecting in a radial direction beyond the end face of the butt flange; The structure is divided into several symmetrically arranged pawls extending over the length of the collar nut, and between each pawl and the outer surface of the collar nut is provided a groove extending the length of the pawl and sloping toward the outer surface of the collar nut. A collar nut characterized in that the abutment surface of each pawl facing toward the member forms an acute angle opening outward with respect to the structural member.