JPH0339608Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field of the invention The invention relates to an assembly pin for connecting parts, and in particular,
This invention relates to improvements in assembly pins for connecting parts used in knock-down furniture, etc.

Technical Background of the Invention In recent years, fiberboard made of compressed wood fibers and chipboard made of compressed wood chips have been widely used as wooden components for furniture and the like. These wooden members have low strength at the end surface, so if they are assembled by directly screwing in wood screws, etc., the strength is likely to be insufficient. Therefore, when connecting and fixing such wooden members, it is necessary to insert assembly pins. In particular, assembly pins are widely used in knock-down type (assembly type) furniture, not only because it is necessary to accurately position the furniture, but also because it is possible to disassemble and reassemble the furniture multiple times.

As an example of a conventional assembly pin, an outer thread and an inner thread are respectively provided at both ends of a rod-shaped member, and the outer thread forming part is screwed into one plate member and then inserted into the other plate member. There is a device in which two plate members are connected and fixed by screwing a fixing screw that passes through the member into the inner screw.

However, with such an assembly pin, if the outer screw is twisted even once with excessive force, the structure of the plate member will collapse and the fixing force will be lost. Thereafter, complete fixation becomes impossible, and assembly errors occur due to rattling of the assembly pins.

In addition, there is also a device in which a large number of locking claws are provided on the insert side of the assembly pin to prevent the pin from coming off. However, even in such assembly pins, if the strength of the wood is low, they tend to loosen, and moreover, when inserted, they are often crooked, resulting in inaccurate results or cracks.

Purpose of the invention Therefore, the present invention has developed an assembly pin that can easily and accurately position plate-like parts that do not have sufficient strength when repeatedly connecting them together, and that can also provide sufficient connection strength. The purpose is to provide.

Summary of the invention In order to achieve the above object, the assembly pin according to the invention is a component connecting assembly pin that connects two plate-shaped components while positioning each other, and the assembly pin is inserted into a recess formed in one component. It is composed of a main body part that is buried so as not to be exposed and fixed with screws, and a positioning dowel part that protrudes from this main body part and is inserted into an insertion hole formed in the other side part, and the main body part is composed of a substantially polygonal column-shaped base that supports the dowel portion, and a flat plate-shaped bulge that is connected to the rear end of this base and whose wall thickness is thinner than that of the base,
A step-shaped toothed portion is formed on the peripheral edge of the main body portion to prevent it from slipping out of the recessed portion, and a fixing bolt is provided on the dowel portion to fix the dowel portion so that it does not slip out from the other side component. It is characterized by the fact that it is provided.

In the assembly pin with such a configuration,
The main body embedded in the component on one side is locked in the tightening direction by the bulge, and
The positioning of the connecting part is performed by a tab inserted into the other part. This tab portion is fixed to the other side component by a fixing bolt as a fixing means. As a result, both parts are accurately and firmly connected and fixed.

Therefore, according to the present invention, it is possible to easily and accurately position two parts together through the dowel part, and at the same time, the locking force of the bulge part of the main body part allows weak parts to be positioned together. However, they can be strongly connected.

In addition, since the wall thickness of the bulge is thinner than that of the base, it is possible to fix the main body with wood screws etc. to the parts on one side so that the amount of screwing is large. The fixing force is increased as a result.

In addition, teeth are formed on the circumferential side of the base and the bulge that make up the main body, and these teeth are formed to bite into the side walls of the recess, preventing them from coming out of the recess. This also allows the main body to be more firmly fixed to the parts on one side.

Specific Description of the Invention Hereinafter, embodiments of the invention will be described in detail based on the drawings.

The embodiment shown in the figure shows a case where plate-like members 1 and 2 are connected and fixed in a state where they are orthogonal to each other. An assembly pin 3 is attached to one side of the plate-like member 1. Furthermore, a fixing bolt 4 is screwed into the assembly pin 3 side of the plate member 2 on the other side so as to pass through the plate member 2.

The assembly pin 3 includes a main body part 5 embedded in the plate-like member 1 and a dowel part 6 protruding from the main body part 5 toward the front side, that is, toward the plate-like member 2 side.

The main body portion 5 is formed from a polygonal columnar base portion 7 that supports the dowel portion 6, and a disk-shaped bulge portion 8 that is connected to the rear end portion of the base portion 7. The base portion 7 and the bulging portion 8 are inserted into a recess formed in the plate-like member 1 . The diameter of the bulge 8 is larger than the width of the base 7, and both sides of the bulge 8 protrude from both ends of the base 7 by a predetermined amount. Thereby, the entire body portion 5 is locked so that it does not slip out toward the front side, that is, toward the plate-like member 2 side.

A fixing wood screw 9 is screwed into the center of the bulge 8. Here, the wall thickness of the bulging portion 8 is formed to be approximately half as thin as the wall thickness of the base portion 7. As a result, the fixing wood screw 9
In this case, the amount of screwing into the plate member 1 is set to be large, and the fixing force thereof is increased.

Further, stepped tooth portions 11 are formed on the peripheral sides of the base portion 7 and the bulging portion 8. This tooth portion 11 is formed so as to bite into the side wall of the recess, and is prevented from slipping out from the recess.

The dowel portion 6 is formed from a hollow cylindrical body extending from the front end surface of the base portion 7 toward the plate member 2 side. This dowel portion 6 is inserted into a mounting hole 12 formed through the plate member 2. In this case, the length of the dowel portion 6 is set shorter than the length of the mounting hole 12.

Further, the inner wall of the hollow portion of the dowel portion 6 is provided with a female thread. The above-mentioned fixing screw 4 is screwed into this female thread by being inserted from the opening on the opposite side of the mounting hole 12.

In order to connect and fix both the plate-like members 1 and 2 in this embodiment, first, the assembly pin 3 is installed in the recessed part on the side of the plate-like member 1, and is fastened with a wood screw 9. In this case, the assembly pin 3 is held by the fixing force of the wood screw 9 and the biting force of the teeth 11 formed around the main body 5 so as not to separate from the recess.

Next, the dowel portion 6 of the assembly pin 3 is inserted into the insertion hole 12 of the plate member 2. As a result, both plate members 1 and 2 are accurately positioned. Finally, the fixing screw 4 is inserted from the opposite side, screwed into the dowel portion 6, and tightened. As a result, both plate members 1 and 2 are tightened and fixed via the assembly pin 3.

In this case, the main body 5 of the assembly pin 3 tries to come out from the plate member 1 due to the tightening force, but the assembly pin 3 is held up by the locking force of the bulge 8 and the fixing force of the wood screws 9. As a result, it is firmly held in that position against the tightening force.

Further, when the fixing screw 4 is loosened and removed from this tightened state, both plate members 1 and 2 are separated from each other. In such assembly and disassembly operations, the structure of the plate members 1 and 2 does not collapse, so assembly and disassembly can be performed any number of times.

Note that the bulging portion 8 of the main body portion 5 is not limited to the circular shape as in this embodiment, but may be formed into various other shapes such as a trapezoidal shape or a triangular shape.

[Brief explanation of the drawing]

The figure is an external perspective view showing an assembly pin in an embodiment of the present invention. 3... Assembly pin, 4... Fixing bolt, 5... Main body, 6... Dowel, 7... Base, 8... Swelling part, 11... Teeth, 12... Insertion hole.

Claims (1)

[Scope of Claim for Utility Model Registration] In an assembly pin for connecting parts that connects two plate-shaped parts 1 and 2 while positioning them, the pin is embedded in a recess formed in the part 1 on one side so as not to come out. The main body part 5 is fixed with a screw, and the dowel part 6 for positioning is inserted into an insertion hole 12 that protrudes from the main body part 5 and is formed in the other side of the component. 5 is made up of a substantially polygonal columnar base 7 that supports the dowel portion 6, and a flat plate-shaped bulge 8 that is connected to the rear end of the base 7 and whose wall thickness is thinner than that of the base 7. A step-shaped tooth portion 11 is formed on the peripheral edge of the main body portion 5 to prevent the dowel portion 6 from slipping out from the recessed portion, and a stepped tooth portion 11 is formed on the dowel portion 6 to prevent the dowel portion 6 from slipping out from the other side component. An assembly pin for connecting parts, characterized in that it is provided with a fixing bolt 4 for fixing the parts.