JPS6314087Y2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Technical Field of the Invention The present invention relates to a fastener for fixing two structural members in, for example, knock-down furniture.

(2) Prior art and its problems In general, the knock-down method has been adopted for furniture such as desks, tables, and boxes in order to simplify transportation and reduce selling prices. However, in the case of the knock-down method, each component of the furniture is assembled by an amateur, and the fasteners used to secure the components are required to be operable and reliable.

By the way, when fixing one constituent member to the other constituent member in a crosswise manner, such as when fixing a top plate and a side plate of a box, etc., the following means are used.

(i) Fix the two components together with a set screw, which is a wood screw. Although this is easy to assemble, it lacks certainty of fixation.

(ii) By applying L-shaped metal fittings to the inner corners of the two structural members and screwing wood screws into each structural member through the through holes of the metal fittings,
Fasten the two components. This is because when screwing a wood screw into one component, the screwdriver used to screw the screw comes close to the other component, making operation of the screwdriver cumbersome. Furthermore, when a corner is pushed back, the worker is forced to work in an awkward position, such as by stretching out his hands or bending over.

(iii) There is sticking due to the dowel sleeve. In this case, fit the dowel sleeve into the mounting hole that communicates from one component to the other component, and rotate the set screw while positioning the head of the set screw of the dowel sleeve on the outer surface of one component. By rotating the set screw, the dowel sleeve is expanded into a skirt shape, and the two components are fixed by pressing the dowel sleeve against the wall surface of the mounting hole. However, since the assembly work is done by amateurs, they often do not know how much to tighten the dowel sleeve and end up over-tightening it. If it is overtightened, a strong pressing force from the dowel sleeve acts on the hole wall of the mounting hole radially outward, which may cause the component to tear in the axial direction of the mounting hole, resulting in a lack of secure fixation.

(iv) There is a structure in which a nut is fitted into the other component, and a bolt passing through one component is screwed into the nut. In this case, since the female threaded hole of the nut cannot be visually seen, it is troublesome to obtain a proper meshing state between the male thread and the female thread when starting to screw in the bolt, and there is a drawback that operability is lacking.

(3) Purpose of the invention The purpose of the invention is to:
The object of the present invention is to provide a fastener that is easy to assemble and has reliable fixation.

(4) Structure of the invention The structure of the fastener according to the invention to achieve the above object is that the base is formed in a columnar shape that is longer than the thickness of one of the constituent members, and at one end in the axial direction, the fastener has a diameter larger than that of the base. A tightening member having a head provided with a tool operation slot is connected to the other end of the tightening member, and one end of a base formed in a columnar shape is connected to the other end of the tightening member via a bolt/nut mechanism, and the other end of the base has an axis line. a locking member having a locking groove drilled in a direction long in the direction; and a locking member that is detachably attached to the locking groove so as to protrude to at least one side in a direction intersecting the direction of movement by the bolt/nut mechanism. and a locking rod that can be fixed to the other component.

(5) An embodiment of the invention The details of the fastening device of the invention will be explained below with reference to FIGS. 1 and 2.

As shown in the first diagram, this tightening tool is composed of a tightening member A, a locking member B, and a stopper C.

The tightening member A has a cylindrical base 1, and a bolt portion 2 is protruded from the center of the other end of the base 1 in the axial direction. The outer diameter of this bolt part 2 is smaller than the outer diameter of the base part 1, and the outer peripheral surface of the bolt part 2, which constitutes one side of the bolt/nut mechanism, has a male thread 3.
is engraved. Further, a head 4 is provided at one end in the axial direction of the base 1, and the outer diameter of the head 4 is larger than the outer diameter of the base 1. A tool operating hole 5, which is a square hole, and a tool operating groove 6, which is a linear concave groove, are bored in the center of the top surface of the head 4 for rotating the tightening member A. The length of the base 1 is longer than the thickness of one component X, which will be described later.

The locking member B has a cylindrical shape with an outer diameter approximately equal to the outer diameter of the base portion 1. A female threaded hole 10 constituting the other part of the bolt/nut mechanism is bored in the center of one end surface of this locking member B toward the axial direction, and the other end of the locking member B is locked as a locking slot. A hole 11 is drilled. This locking hole 11 is penetrated in the radial direction from the outer peripheral surface of the locking member B.
It is elongated vertically in the direction of the axis. Further, a chamfer 12 is formed on the outer peripheral edge of the other end of the locking member B.

The locking rod C includes a shaft portion 20 that is inserted into and retractably from the locking hole 11, and a flange portion 21 is provided at one end of the shaft portion 20. A tool operating groove 22 for rotating the stopper C is bored in the top surface of the flange 21. In addition, a male thread 2 is provided on the outer circumferential surface of one end of the shaft portion 20.
Several 3's are sticking out. The length of the shaft portion 20 is shorter than the thickness of the other component Y, which will be described later.

On the other hand, the tightening member A and the locking member B are temporarily fixed in a connected state through the bolt portion 2 and the female screw hole 10. That is, after the orientation of the locking hole 11 is determined based on the orientation of the tool operating groove 6, the adhesive D is applied over the outer peripheral surface of the bolt portion 2 and the end surface around the female threaded hole 10. The adhesive force of the adhesive D is such that it is destroyed during the tightening operation of the tightening member A, which will be described later.

A through hole 30 is bored in the one component X. This through hole 30 passes through one plate surface of one component X, that is, the plate surface located on the outside during assembly, to the other plate surface, that is, the plate surface located on the inside during assembly. The hole diameter of this through hole 30 is
is slightly larger than the outer diameter of the locking member B.

A mounting hole 40 with a bottom is formed in the other component Y to connect with the through hole 30. This mounting hole 40 is bored along the plate surface from the end surface of the other component Y which is abutted against the one component X in a crosswise manner. In the mounting hole 40, there is a locking member B connected to the tightening member A using a bolt and nut mechanism during assembly.
is stored. Further, a fitting hole 41 is bored in the other component Y. This fitting hole 41 is bored in a bottomed shape from one plate surface to the other plate surface of the other component Y, and passes through the lower part of the mounting hole 40 while intersecting with it. When the end surface of the locking member B on the chamfer 12 side comes into contact with the bottom surface of the mounting hole 40, a part of the locking hole 11 is engaged with the fitting hole 41.
The hole diameter of the fitting hole 41 is slightly larger than the outer diameter of the shaft portion 20 of the stopper C.

On the other hand, the through hole 30, the mounting hole 40, and the fitting hole 41 are processed in advance during the manufacturing process of both the components X and Y.

Hereinafter, a case will be described in which both the structural members X and Y are fixed together. First, the locking member B and the tightening member A are fitted into the mounting hole 40 from the through hole 30. Then, in a state where the end surface of the locking member B with the chamfer 12 formed thereon is in contact with the bottom surface of the mounting hole 40, a flat head screwdriver (not shown) is inserted into the tool operation groove 6, and depending on the direction of the tool operation groove 6, Align the direction of the locking hole 11 with the fitting hole 41. At this time, the fitting hole 41 is communicated with the upper end side of the locking hole 11. Then, the shaft portion 21 of the stopper C is inserted into the fitting hole 41 and the locking hole 11. After that, the tool operation hole 5
Alternatively, a suitable tool (not shown) is fitted into the tool operating groove 6, and the tightening member A is rotated in the direction in which the bolt portion 2 enters the female threaded hole 10 to perform a tightening operation. At this time, the adhesion of the adhesive D is broken and the locking member B is pulled up inside the mounting hole 40, and the locking member B is pulled up inside the mounting hole 40.
1 comes into contact with the outer peripheral surface of the shaft portion 20 of the stopper C, and the head 4 of the tightening member A comes into contact with the plate surface around the outside of the through hole 30. Therefore, by the tightening operation of the tightening member A, the locking hole 11 and the shaft portion 20 are locked together, and the head 4 is brought into contact with the plate surface, thereby fixing both the structural members X and Y ( (See Figure 2). In other words, by tightening the tightening member A from the outside of one component X, both components X and Y are fixed.

By the way, in the case of the above-mentioned fastener, since the locking rod C is detachably attached to the locking member B, there is no need for a troublesome screwing operation when locking the locking member B and the locking rod C. be. Moreover, the male screw 23 of the stopper C
By biting into the hole wall of the fitting hole 41,
The stopper C can be prevented from falling off, and the temporary fixation of both components X and Y can be maintained.

Further, when the fixing of both the structural members X and Y is completed, the base 1 of the tightening member A is located in the through hole 30 and the mounting hole 40 as shown in the second diagram. Due to the barrier effect of the base 1, the resistance of one component X to the other component Y
positional shift is prevented.

(6) Variations of the idea Next, a modification of the present invention will be described.

(a) In the modification shown in FIGS. 3 and 4, the locking member B
and stop rod C. A part of the outer peripheral surface of this locking member B is a flat surface 13. Due to this flat surface 13, when the locking member B is fitted into the mounting hole 40, the locking hole 11A and the fitting hole 4
1 is necessarily performed. That is,
A flat projecting surface 42 that faces the flat surface 13 is projected from a part of the hole wall of the mounting hole 40, and the flat surface 1
3 and the protruding surface 42, the locking member B located within the mounting hole 40 is prevented from rotating in the circumferential direction. In other words, due to the rotation prevention effect of the locking member B, the locking member B is inserted into the mounting hole 40.
By fitting, the locking hole 11A faces the fitting hole 41. This locking hole 11A is a circular large diameter hole. In addition, the shaft part 2 of the stopper C
Outer diameter l ₁ of the root part located on the flange 21 side of 0A
It is slightly larger than the hole diameter of the fitting hole 41.
The outer diameter _l2 of the tip portion of the shaft portion 20A is smaller than the fitting hole 41, and the outer circumferential surface of the shaft portion 20A is tapered such that the outer diameter smoothly increases from the tip to the root portion. ing. Therefore, by pushing the shaft portion 20A into the fitting hole 41, the stopper C is prevented from falling off.

(b) Fig. 5 shows a modification of the stopper C, in which the shaft portion 20B of this stopper C is prismatic, and the shaft portion 20B is prismatic.
A male thread 24 is cut into the outer peripheral corner of the tip of 0B. When the locking rod C is used, the fitting hole 41B is formed into a rectangular tube shape that allows the shaft portion 20B to be freely inserted into and removed from the shaft portion 20B, and to prevent rotation of the shaft portion 20B. Further, the fitting hole 41B is penetrated from one plate surface to the other plate surface of the other component Y, and a nut or blindfold (not shown) is seated on the male screw 24. This nut or blind seating prevents the stopper C from falling off during the temporary assembly of both the structural members X and Y.

(c) In the above embodiment and each modification example, the case where the stopper C is fitted from the inside of the other component Y is illustrated, but the fitting direction of the stopper C is from the outside of the other component Y. Good too.

(d) The flange portion 21 of the stopper C may not be provided. That is, the shafts 20, 20A, 20B may be formed into a cylinder shape.

(e) Although not shown, the bolt/nut mechanism has a bolt portion protruding from the locking member B, and a female threaded hole with a bottom extending from the center of one end surface of the base 1 of the tightening member A toward the head 4. It may be formed into

The modification shown in FIG. 6 includes a locking member B and a locking rod C.
There are characteristics. An intermediate portion near the other end of the locking member B is provided with a locking shaft 11B as a locking slot. The locking shaft 11B is formed to have a reduced diameter on the locking member B, and stepped surfaces 1 are provided at both ends in the axial direction of the locking shaft 11B.
4 is formed in a ring shape. The length of the locking shaft 11B in the axial direction is larger than the outer diameter of the shaft portion 20B of the locking rod C. In addition, the shaft portion 20B of the stopper C
A locking groove 24 extends from the tip toward the head 21.
It is engraved in the form of letters. The opening width of the locking groove 24 is larger than the outer diameter of the locking shaft 11B, but smaller than the outer diameter of the stepped surface 14. The shaft portion 20B is fitted into the fitting hole 41B of the other component Y. According to this modification, since the locking shaft 11B is configured as a shaft, when the locking member B is inserted into the mounting hole 40 during assembly, the locking groove 14 of the locking rod C is
There is no need to consider the direction of insertion to ensure fit. That is, the locking shaft 11B is inserted into the fitting hole 4.
1B, the locking member B is inserted into the mounting hole 40.
If the locking groove 14 is inserted into the locking member B, the locking groove 14 can be inserted into the locking groove 14 by simply orienting the opening width direction of the locking groove 14 in the axial direction of the locking member B, regardless of the circumferential position of the locking member B. from the fitting hole 41B to the locking shaft 11B.
It can be attached to.

Further, according to this modification, the shaft portion 2 of the stopper C
Since 0B can be made thicker, the strength of the stopper C can be increased.

(7) Effects of the invention As explained above, the invention has the following effects.

(b) A two-piece system that simply inserts a coaxial tightening member and a locking member into two structural members using a bolt-and-nut mechanism, and attaches a locking rod to a locking slot in the locking member so that it can be inserted and removed freely. Temporary assembly can be done with simple work.

After assembly and adjustment, final tightening can be easily performed from the outside of the component through the tool operation slot.

(b) Even if the two components are not assembled accurately, the locking rod can be easily locked due to the length of the locking groove, and the troublesome hole position alignment required in the conventional method can be eliminated. As a result, it can be suitably used for furniture that is assembled by general users.

(c) Even when two columnar members are made coaxial with a bolt-nut mechanism to avoid temporary screwing, the length of the tightening member allows accurate positioning of the two constituent members. can be done.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the fastener according to the present invention, and Fig. 2 is a perspective view of the fastener according to the present invention.
A line sectional view, FIG. 3 is a perspective view corresponding to FIG. 1 for explaining a modification of the present invention, FIG. 4 is a plan view taken from the direction of the arrow in FIG. 3, and FIG. 5 is a modification of the present invention. FIG. 6 is a perspective view of a stop rod according to an example, and is a perspective view corresponding to FIG. 1 of another modification of the present invention. A... Tightening member, B... Locking member, C... Stopping rod, 1... Base, 2... Bolt part, 10... Female threaded hole, 11, 11A... Locking hole, 20, 20A...
...Shaft portion, 30...Through hole, 40...Mounting hole, 41
...Inset hole.

Claims (1)

[Scope of utility model registration request] This is for fixing two structural members together, and the base is formed into a columnar shape that is longer than the thickness of one of the structural members, and at one end in the axial direction, the head is provided with a tool operating slot with a diameter larger than that of the base. One end of the base formed in a columnar shape is connected to the other end of the base of the tightening member through a bolt-and-nut mechanism, and a locking slot long in the axial direction is bored at the other end of the base. A locking member is removably attached to the locking groove of the locking member so as to protrude toward at least one side in a direction intersecting the direction of movement by the bolt/nut mechanism, and is attached to the other structural member. A fastener comprising a locking rod that can be fixed.