JPH0612820U - Bolt member - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the cylinder from unnecessarily expanding when the bolt member is press-fitted into the mounting plate, and to prevent the cylinder from protruding to the bottom surface of the mounting plate. [Structure] An inner surface of a cylindrical body 2A provided at an upper end of the nut portion 2 has an inner diameter larger than a diameter of a screw portion 3A of a shaft 3B of a bolt portion 3 in a state before the nut portion 2 is press-fitted into a mounting plate 5. Further, after the nut portion 2 is press-fitted into the mounting plate 5, a groove 2C for accommodating the portion 2a crushed by the press-fitting is formed, and further, a tapered surface 3a is formed on the bottom surface of the screw 3C. In addition, a knurl 8 is provided at the lower end of the nut portion 2,
Furthermore, a taper surface 9 with a widened hem is provided at the bottom of the knurled piece 8.
A shank 9 having A is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bolt member that is used by being press-fitted into one side of a pair of mounting plates that form an opening / closing portion of various product panels.

[0002]

[Prior art]

 The opening / closing part of various product panels is composed of a pair of mounting plates, and a bolt member is press-fitted to one side and a nut member is press-fitted to the other side, and the bolt members are screwed into these nut members to perform opening / closing operations. The structure is known. These bolt members or nut members are used not only for opening and closing, but also for the purpose of enhancing the commercial value by making them excellent in design by being present as decorative screws.

FIG. 10 shows a conventional structure of a bolt member used for such a purpose. The bolt member 31 includes a nut portion 32 having cylindrical bodies 32A and 32B at upper and lower ends, and a surrounding portion. The screw 33A has a shaft 33B cut therein, and one end side is fixed to the screw 33C and the other end side is rotatably inserted into the nut part 32. The bolt part 33 is wound around the shaft 33B. It is composed of a screw 33C and a spring 34 for biasing between the nut portion 32. Here, the bolt member 31 of FIG. 10 shows the structure after being press-fitted into the hole portion 35A of the mounting plate 35 on one side, and each tubular body of the nut portion 32 that was provided in a straight line before press-fitting. The ends of 32A and 32B are crushed by press fitting.

In the structure of the bolt member 31 after the press-fitting, the bolt portion 33 is prevented from slipping out above the nut portion 32, especially when the cylindrical body 32A at the upper end of the nut portion 32 is crushed. Similarly to the bolt member 31, the nut member 37 is press-fitted into the hole 36A of the mounting plate 36 on the other side facing the mounting plate 35 on the one side. As a result, the bolt member 31 is screwed into the nut member 37 by rotating the screw 33C of the bolt portion 33, so that the pair of mounting plates 35 and 36 are closed. On the contrary, when the bolt member 31 is released from the nut member 37 to be free, the bolt member 31 is urged upward by the spring 34, so that the pair of mounting plates 35 and 36 are opened.

[0005]

[Problems to be solved by the device]

 By the way, in the structure of the conventional bolt member 31, when the nut portion 32 is press-fitted into the mounting plate 35, the crushed portion of the cylindrical body 32A at the upper end may spread outwardly of the shaft 33B of the bolt portion 33 like 32a. Therefore, there is a problem that the expansion and contraction operation of the spring 34 is hindered. Further, as another problem, since the cylindrical body 32B at the lower end of the nut portion 32 projects to the bottom surface of the mounting plate 35 after being press-fitted, when the mounting plates 35 and 36 are closed, they may not come into close contact with each other. Further, when these problems occur, the appearance may be inferior, which may reduce the commercial value.

The present invention has been made to solve the above problems, and prevents unnecessary expansion of the cylinder when the bolt member is press-fitted into the mounting plate. It is an object of the present invention to provide a bolt member that prevents the protrusion of the bolt.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention has a nut portion press-fitted into a mounting plate, and one end side of a shaft having a thread cut around it is fixed to the screw and the other end side is movable in the nut portion. In a bolt member composed of an inserted bolt portion and a spring wound around the shaft and biasing between the screw and the nut portion, a tubular body is provided at the upper end of the nut portion. The inner surface of the body has an inner diameter that is larger than the diameter of the threaded portion of the shaft before the nut part is press-fitted into the mounting plate, or the part that is crushed by press-fitting after the nut part is press-fitted into the mounting plate. It is characterized in that a groove for accommodating is formed. Another aspect of the present invention is characterized in that a knurl is provided at the lower end of the nut portion, and a shank having a tapered surface that spreads at the bottom is provided at the lower portion of the knurl.

[0008]

[Action]

 According to the configuration of the present invention described in claim 1, the inner diameter of the inner surface of the cylindrical body provided at the upper end of the nut portion is larger than the diameter of the threaded portion of the shaft of the bolt portion before the nut portion is press-fitted into the mounting plate. Also, after the nut part is press-fitted into the mounting plate, a groove for accommodating the part crushed by press-fitting is formed, so the expansion of the cylinder when the bolt member is press-fitted into the mounting plate is prevented. Can be prevented.

According to the configuration of the present invention as set forth in claim 2, since the knurl is provided at the lower end of the nut portion, and the shank having the tapered surface that widens the hem is provided at the lower portion of the knurl, the bolt member is attached. It is possible to prevent the cylindrical body from spreading when it is press-fitted into the plate, and to prevent the knurls and shanks corresponding to the conventional cylindrical body from protruding to the bottom surface of the mounting plate.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 is a side view showing an embodiment of the bolt member of the present invention, and FIG. 2 is a sectional view of FIG. The bolt member 1 of the present embodiment has a nut portion 2 having a cylindrical body 2A at the upper end and a shaft 3B around which a screw 3A is cut, and has one end fixed to the screw 3C and the other end side. It comprises a bolt portion 3 movably inserted into the nut portion 2 and a spring 4 wound around the shaft 3B and biasing between the screw 3C and the nut portion 3.

Further, the inner surface of the cylindrical body 2A of the nut portion 2 has an inner diameter larger than the diameter of the threaded portion of the shaft 3B before the nut portion 2 is press-fitted into the mounting plate 5 in FIGS. 3 and 4. After the nut portion 2 is press-fitted into the mounting plate 5 as shown in FIGS. 3 and 4, a groove 2C is formed to accommodate the portion 2a crushed by the press-fitting. Here, a tapered surface 3a is formed on the bottom surface of the screw 3C, and when the nut portion 2 is pressed into the mounting plate 5, the tapered surface 3a presses the tip portion 2a of the tubular body 2A and bends inward. Works like a bend.

Further, a knurl 8 is provided at the lower end of the nut portion 2, and a shank 9 having a tapered surface 9 A that spreads at the bottom is provided at the lower portion of the knurl 8. The bolt member 1 of FIG. 3 shows the structure after being press-fitted into the hole 5A of the mounting plate 5 on one side, and FIG. 4 is a sectional view of FIG.

By previously forming the groove 2C on the inner surface of the cylindrical body 2A above the nut portion 2 and forming the taper surface 3a on the bottom surface of the screw 3C, the bolt member 1 is attached to the mounting plate 5. When press-fitted, as shown in FIG. 4, the tip portion 2a of the cylindrical body 2A is bent while being slid inward by the taper surface 3a. Therefore, the tip portion 2a of the cylindrical body 2A is crushed and accommodated in the groove 2C. Therefore, it does not spread in the outer direction of the shaft 3B. In this respect, when the bottom surface of the screw 3C is flat as shown in FIG. 10, the tip end portion is crushed outward like 32a.

FIG. 5 shows a method of press-fitting the bolt member 1 into the mounting plate 5. The mounting plate 5 is provided with a hole 5A having a diameter smaller than that of the knurl 8 and larger than that of the shank 9 in advance. With the lower die 5 supported by the lower die 10, the screw 3C is pressed by the press 11 as shown in FIG. At this time, pressure is applied so that the knurl 8 is completely pressed into the mounting plate 5 over the entire thickness. Immediately after the press-fitting, the shaft 3B of the bolt portion 3 projects downward, so the lower mold 10 has a thickness sufficiently larger than that of the shaft 3B.

Since the bolt member 1 is press-fitted into the hole of the mounting plate 5 in this manner, the portion 5a crushed by the knurl 8 covers the tapered surface 9A of the shank 9, so that the bolt member 1 is completely removed. It is fixed to the mounting plate 5, and the knurl 8 and the shank 9 do not project to the bottom surface of the mounting plate 5.

In FIG. 3, the nut member 7 is press-fitted into the mounting plate 6 on the other side corresponding to the mounting plate 5 in the same manner as the bolt member 1. 7 and 8 show a method of press-fitting the nut member 7 into the mounting plate 6, in which a hole 6A smaller than the diameter of the knurl 13 and larger than the diameter of the shank 14 is provided in the mounting plate 6 in advance. The nut member 7 can be press-fitted into the mounting plate 6 by press-fitting the mounting plate 6 as shown in FIG. 7.

FIG. 9 shows a combination of the bolt member 1 press-fitted in the mounting plate 5 and the nut member 7 press-fitted in the mounting plate 6 in this manner, and the bolt member 1 is screwed into the nut member 7 to form a pair of mounting members. It shows an example in which the plates 5 and 6 are closed. On the contrary, by releasing the bolt member 1 from the nut member 7 to make it free, the bolt member 1 is biased upward by the spring 4, so that the pair of mounting plates 5 and 6 can be opened. ..

[0018]

[Effect of device]

 As described above, according to the configuration of claim 1 of the present invention, it is possible to prevent the expansion of the cylindrical body when the bolt member is press-fitted into the mounting plate. According to the structure of claim 2, when the bolt member is press-fitted into the mounting plate, the expansion of the cylindrical body can be prevented, and the knurls and shanks corresponding to the cylindrical body can be prevented from protruding to the bottom surface of the mounting plate. You can

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a bolt member of the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a side view showing a structure in which a bolt member of the present embodiment is press-fitted into a mounting plate.

4 is a cross-sectional view of FIG.

FIG. 5 is a side view showing a method of press-fitting a bolt member of this embodiment into a mounting plate.

FIG. 6 is a side view showing a state where the bolt member of the present embodiment is press-fitted into a mounting plate.

FIG. 7 is a side view showing a method of press-fitting a nut member into a mounting plate.

FIG. 8 is a side view showing a state in which a nut member is press-fitted into a mounting plate.

FIG. 9 is a side view showing an example of a combination of a mounting plate into which a bolt member of this embodiment is press-fitted and a mounting plate into which a nut member is press-fitted.

FIG. 10 is a cross-sectional view showing a conventional bolt member.

[Explanation of symbols]

 1 Bolt member 2 Nut part 2A Cylinder 2a Crushed part (tip part) 2C Groove 3 Bolt part 3a Tapered surface 3B Shaft 4 Spring 5,6 Mounting plate 5a Crushed part 8 Knurled 9 Shank 9A Tapered surface

Claims (2)

[Scope of utility model registration request] 1. A nut portion press-fitted into a mounting plate, and a bolt portion in which one end side of a shaft having a thread cut into the periphery is fixed to the screw and the other end side is movably inserted into the nut portion. In a bolt member which is wound around the shaft and is composed of a screw and a spring for urging between the nut portions, a tubular body is provided at the upper end of the nut portion, and the nut portion is attached to the inner surface of the tubular body. Before being press-fitted into the plate, it has an inner diameter larger than the diameter of the threaded portion of the shaft, and after the nut part is press-fitted into the mounting plate, a groove for accommodating the crushed part by press-fitting is formed. A bolt member characterized by. 2. A bolt member characterized in that a knurl is provided at the lower end of the nut portion, and a shank having a tapered surface that spreads at the bottom is provided at the lower portion of the knurl.