JPH0537043Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to bolts used in machinery, construction, etc., and particularly relates to soft bolts.

[Prior Art] A conventional bolt is entirely made of a metal material such as steel, and the shaft portion is inserted into the bolt hole of each fastening member, and the threaded portion is screwed into a nut made of metal such as steel. The attached member is attached to the attached member by tightening the screws, or by inserting the shaft portion into the bolt hole of the attached member, screwing the threaded portion into the screw hole of the attaching member, and tightening.

[Problem to be solved by the invention] However, especially in construction, when two members are to be fastened together by shifting them relative to each other, or when it is desired to enable the two members to shift relative to each other after they are fastened, the bolt holes in one of the members must be made into elongated holes. Alternatively, they were made with a blank hole or fastened through an intermediate member that could slide in any direction or in one direction. This requires machining a long hole or preparing an intermediate member, and if the amount of shift is not known in advance, it is impossible to process the long hole or prepare an intermediate member. Therefore, the fastening and installation work is greatly reduced.

An object of the present invention is to provide a bolt that can be easily fastened or attached to a hole in a fastening member or mounting member whose axis is offset.

[Means for Solving the Problems] According to the present invention, in a bolt having a bolt head 2 and a bolt shaft 3, the cross-sectional shape of the bolt shaft 3 has a plurality of arcuate portions having a gap S on the outer circumferential side. 4 and a core portion 5 other than the circular arc portion 4,
The head portion 2 and the arcuate portion 4 are made of a hard material, and the core portion 5 is made of a hard material.
Made of softer material.

[Preferred Embodiment] In implementing the present invention, hard materials include metal polycarbonate resins, acetal resins, etc., and soft materials include urethane rubber materials.

Further, by providing only one pair of gap portions facing each other, the bolt can be bent and directionality can be provided.

[Function] In a bolt configured as described above, the bolt holes or the bolt holes and screw holes are misaligned, and when the nut is tightened or the bolt is screwed in, a bending force acts on the shaft, and this bending The force elastically deforms a gap in the core that is orthogonal to the direction of the bending force, thereby elastically deforming the core and bending the entire shaft in the direction of the bending force. Also, after installation, the bolt hole
The same applies if the screw holes are misaligned.

[Examples] Examples of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, the cross-sectional shape of the shaft portion 3 that is continuous to the head 2 of the bolt, which is generally designated by the reference numeral 1, has a plurality of (five in the illustrated example) each having a gap S between them on the outer circumferential side. ) is formed from a circular arc portion 4 and a core portion 5 other than the circular arc portion 4. And head 1
The arc portion 4 is made of a relatively hard material such as polycarbonate resin or acetal resin, and the core portion 5 is made of a relatively soft material such as urethane rubber.

As shown in FIG. 3, the bolt 1 is manufactured by integrally injection molding the head 2 and the arcuate portion 4 from a nozzle 15 using, for example, a polycarbonate resin material using threaded molds 10, 11 and 12.

Next, as shown in FIG. 4, the mold 12 is pulled out and replaced with a mold 14, and a core 5 is integrally injected from a nozzle 16 with a urethane rubber material, for example, into the inner part of the head 2 and the arcuate part 4. Shape.

The threaded portion 3a (FIG. 1) may be provided with a thread in the mold 10 in advance. Alternatively, it may be machined.

Next, the effect will be explained.

As shown in FIG. 5, the bolt holes 7 of members A and B
a, 7b are misaligned, or if they are misaligned after installation, insert the shaft portion 3 of the bolt 1 into the bolt holes 7a, 7b.
A nut 6 made of a relatively hard material such as polycarbonate resin is inserted into the threaded portion 3a.
When screwed together and tightened, both members A,
B causes bending forces F and F to act. These forces F
Therefore, the gap S in the direction perpendicular to the force F of the core 5
is elastically deformed, the entire shaft portion of the core portion 5 is elastically deformed, and the shaft portion 3 bends as shown in the figure.
Both members A and B are fastened by bolt 1 and nut 6.

FIG. 6 shows another embodiment of the present invention, in which the shaft portion 3A
This is an example in which two arcuate portions 4A are formed, a pair of opposing gap portions S and S are formed, and the bendable direction of the shaft portion 3A is set in the direction of the arrow.

FIG. 7 shows another example of the use of the bolt 1 according to the present invention. In the figure, when two plates C and D are attached by bolt 1 while maintaining a relatively long distance L, one The plate C is tightened between the bolt head 2 of the bolt 1 and the nut 20, and the other plate D is tightened with the nut 21 provided on one plate C side and the nut 22 provided on the opposite side. More double nuts 2
This is an example in which 3 is provided. In this case, even if the plates C and D move slightly relative to each other, the bolt 1 can absorb the movement.

[Effects of the invention] As described above, the present invention provides the following excellent effects.

(i) Even if the axes of the bolt holes and screw holes of both members are offset, the shank of the bolt made of soft material can be deformed, so both members can be fastened or attached.

(ii) Since the arc portion is made of a hard material, sufficient tightening force can be applied to the threads of the bolt, allowing it to maintain the same strength as a normal bolt.

(iii) Since the head of the bolt is made of a hard material, it can be tightened strongly using a tool.

(iv) Therefore, there is no need to make the bolt holes long or use intermediate members, and workability can be improved.

[Brief explanation of the drawing]

Figure 1 is a side view showing one embodiment of the present invention;
The figure is a sectional view taken along the - line in Fig. 1, Figs. 3 and 4 are side sectional views explaining the manufacturing process, Fig. 5 is a side view during fastening to explain the action, and Fig. 6 is the present invention. FIG. 7 is a side view showing another example of use of the present invention. 1... Bolt, 3, 3A... Shaft part, 3a... Threaded part, 4, 4a... Arc part, 5, 5A... Core part.

Claims (1)

[Scope of utility model registration request] In a bolt having a bolt head 2 and a bolt shaft 3, the cross-sectional shape of the bolt shaft 3 includes a plurality of circular arc portions 4 having a gap S on the outer circumferential side, and the circular arc portion 4.
The head part 2 and the arcuate part 4 are made of a hard material, and the core part 5 is made of a hard material.
A bolt characterized in that it is made of a material softer than the head 2 and the arcuate portion 4.