JP2003278280A - Fastening device for wood - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that there are a large number of examples that a flexible member is interposed as a locking for a fastening tool but the fastening member is loosened finally because wood is shrunk by an air seasoning and the fastening tool is loosened when wood is fastened. <P>SOLUTION: In a fastening holding device for wood, the side brought into contact with a member to be fastened is formed in a plane 6 and a folded-back front end section is formed in a plane 8 approximately parallel with the plane 6 in a leaf spring 5 formed by folding back a plate composed of a rectangular spring material, a hole 9 in which the fastening member is passed is formed to both planes 6 and 8, two wedge pieces 12 and 16, against which inclined planes 14 and 18 are abutted mutually, are installed between the plane 6 and the plane 8, and the other wedge piece 16 is urged by a coil spring 21 while being moved to one wedge piece 12 in the leaf spring arranged between the fastening tool and the member to be fastened, thus constituting a section between the fastening member and the member to be fastened of a rigid body at all times even when the member to be fastened is shrunk. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for maintaining a fastening state of a fastening portion mainly using bolts and nuts used for fastening timber.

[002]

2. Description of the Related Art Wooden structures are the mainstream in Japanese buildings, particularly residential buildings, but the joints or joints of the skeletons require various reinforcements because they are required to be reinforced and strengthened while simplifying the processing of complicated joints. There are many cases where hardware is used together. For example, strip metal parts, box metal parts, and most of all, are battledore metal parts using bolts and nuts.

[003]

Wood as a building material is light and easy to process. However, it absorbs water and expands and contracts depending on the water content of wood. As a structural material, it is generally considered that a water content of 15% or less is desirable, but it is said that undried wood is often used for various reasons. In that case, after the construction, the wood has a low water content due to natural drying and shrinks, resulting in, for example, pillars, beams, and a gap occurring at the joint surface of the beam or the barrel. With so-called wood shavings, for example, in a battledore metal sheet that has been widely used recently, the bolts and nuts are in a loosened state, and the reinforcing metal fittings no longer serve their purpose shortly after construction. Several proposals have already been made as countermeasures against so-called wood shavings. In the end, all of them have a structure in which a flexible member is arranged between the fastener and the member to be fastened. That is, the bending force is easily generated against the external force of, and, for example, a gap is generated at the joint portion of the wooden structure, which makes the reinforcement meaningless as described above. The effect cannot be obtained simply by interposing the flexible member. Furthermore, it is necessary to consider that the length of the wood used for the framework of a house is long and may not be suppressed by the contraction of 1 to 2 mm. Given the recent circumstances in which further strengthening of the seismic structure is desired, the development of a device with a stronger reinforcing effect is awaited.

[004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention relates to a fastening and holding device for fastening portions such as bolts and nuts used for wood, which is provided between fasteners such as bolts and nuts and members to be fastened. A leaf spring that presses the fastener and the member to be fastened, and is formed by folding back a plate made of a rectangular spring material. One side that is in contact with the fastened member is formed into a flat surface, and the tip of the other side that is folded back is formed. Part is a plane substantially parallel to the plane, both planes have holes through which fasteners pass, and further two wedge pieces are provided between the planes, where the inclined surfaces abut each other, The wedge piece has a surface in contact with the plane of the tip end of the leaf spring and an inclined surface on the opposite side thereof and is held immovably with respect to the leaf spring, and the second wedge piece is in contact with the plane on the member to be fastened side. The surface and the opposite side are similar A plate having an inclined surface, provided with a guide means movable in a direction opposite to the inclined surface of the first wedge piece, and further provided with a spring means for urging the inclined surface in a direction in which the inclined surface is in pressure contact, and a plate due to contraction of the fastened member Fastening the second wedge piece relative to the first wedge piece by the spring means as the distance between the planes of the springs gradually increases so that the fastener and the fastened member are always rigid. The invention is characterized in that the fastening state of the tool is maintained. Further, the guide means is formed by forming a long groove at one end of the second wedge piece so as to engage with a bolt shaft of a fastener, and a pin fixed to the other end is passed through a hole provided in the leaf spring. Is a coil spring inserted between the second wedge piece and the leaf spring and inserted into the pin fixed to the second wedge piece.

[0095]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

[Structure] FIG. 1 is a side view (partly in section) of a state where the fastening and holding device of the present invention is attached to a wooden structure. FIG. 2 is a plan view of FIG. FIG. 3 is a perspective view of the device of the present invention. Figure 1
Is an example of a wooden structure found in wooden houses or wood products. It is a state in which the bolts 3 and the nuts 4 which are fasteners are fastening the timbers 1 and 2 which are members to be fastened via the fastening holding device of the present invention. The leaf spring 5 has a flat surface 6 on one side in contact with the wood portion 1 and is folded back to have an arc-shaped portion 7 having a flat surface 8 with which the head of the bolt 3 (the nut 4 if the bolt 3 is turned upside down is engaged). Has been formed. The plane 8 is a plane substantially parallel to the plane 6. There are also holes 9 in the planes 6 and 8 through which the bolts 3 of the fastener pass. There is a suitable spacing between the planes 6 and 8 between which two wedge pieces 12 and 16 are sandwiched. The wedge piece 12 has a surface 13 that comes into contact with the flat surface 8 of the leaf spring 5, an inclined surface 14 on the opposite side, and a hole 15 into which the bolt 3 fits in the center. The other wedge piece 16 has a surface 17 that abuts the flat surface 6 of the leaf spring 5, an inclined surface 18 on the opposite side, and a long groove 19. The long groove 19 is engaged with the shaft portion of the bolt 3 of the fastener. A pin 20 having a coil spring 21 inserted through the hole 10 of the leaf spring 5 is fixed to the wedge piece 16. Therefore, in the wedge piece 16, the long groove 19 that engages with the bolt 3 and the pin 20 that engages with the hole 10 of the leaf spring 5 serve as guide members, and the coil spring 21 extends in the direction opposite to the wedge piece 12.
Is urged by. The inclined surfaces 14 and 18 of the wedge pieces 12 and 16 have the same angle, and are in pressure contact with each other by the coil spring 21. The slit 11 of the leaf spring 5 has an arc-shaped portion 7
It is provided in order to have especially flexibility.

[0096]

FIG. 1 shows a state in which the wood portion 1 and the wood portion 2 are fastened by the bolts 3 and the nuts 4. The operation in this state will be described. The wood portions 1 and 2 have a thickness dimension due to natural drying. When it decreases, the distance between the plane 6 and the plane 8 increases, and the wedge piece 16 moves to the wedge piece 12 side by the coil spring 21 in accordance with the increase, and the dimension between the surface 13 and the surface 17 is reduced by the action of the inclined surface 14 and the inclined surface 18. This increases the gap between the planes 6 and 8 and fills the gap. The wedge piece 12 and the wedge piece 16 are made of a rigid steel material and the inclined surfaces 14 and 18 are formed as gentle wedge surfaces.
Even if an external force is applied in either of the axial directions, the member to be fastened can be firmly fastened. The leaf spring 5 is a member having flexibility, but since the wedge piece 12 and the wedge piece 16 which are interposed therebetween are rigid bodies, they are characterized in that they are always rigid bodies against an external force in the axial direction. Explaining more concretely, in the case of the fastening device shown in FIG. 1, if the size of the shape of the leaf spring 5 is set to about 80 mm, even if the fastening member is reduced by about 7 mm from the movable range of the wedge piece 16. It can be firmly fixed and held without play. It can be easily understood that if this device is used for bolts and nuts which are fasteners of battledore metal fittings used for frames and beams of wooden houses, it will not loosen forever. In addition, if the connection between the large pullout and the joist such as a wooden corridor is constructed as shown in Fig. 1, the corridor will not produce creaking noise forever.

[0097]

As described above, the fastener holding device of the present invention can continue to fasten the fastened member firmly against the external force in the axial direction of the fastener even if the thickness of the fastened member is reduced. It has the feature that it is always rigid against external force. It is possible to set a large reduction width of the thickness of the member to be fastened and to prevent a slight gap from occurring. Mass production of element parts is easy.

[Brief description of drawings]

FIG. 1 is a side view (partial cross section) of a state where a fastening and holding device according to an embodiment of the present invention is attached to a wooden structure portion.

FIG. 2 is a plan view of FIG.

FIG. 3 is a perspective view of an embodiment of the present invention.

[Explanation of symbols]

1, 2, wood part 12, wedge piece 19, long groove 3, bolt 13, surface 20, pin 4, nut 14, inclined surface 21, coil spring 5, leaf spring 15, hole 6, flat surface 16, wedge piece 7, arc shape Part 17, surface 8, flat surface 18, inclined surface 9, hole

Claims (2)

[Claims] 1. A holding device for holding a fastening portion by bolts, nuts and the like used for wood, which is a leaf spring that is between a fastener such as a bolt and a nut and a member to be fastened and presses the fastener and the member to be fastened. One side of the leaf spring formed by folding back a plate made of a rectangular spring material and contacting the member to be fastened is formed into a flat surface, and the tip end of the other side that is folded back is a plane substantially parallel to the above plane. There is a hole through which the tool penetrates, and further two wedge pieces are provided between the planes, the inclined surfaces of which contact each other, and the first wedge piece has a surface contacting the plane of the tip portion of the leaf spring and its surface. The second wedge piece has an inclined surface on the opposite side and is held immovably with respect to the leaf spring, and the second wedge piece is in contact with the flat surface of the member to be fastened and the opposite inclined surface is in contact with the inclined surface. Which has a slope and faces the inclined surface of the first wedge piece Is provided with movable guide means, and further with spring means for urging the inclined surface in a direction in which the inclined surface is in pressure contact, the first means is provided as the distance between the flat surfaces of the leaf spring is gradually increased due to contraction of the fastened member. A fastening holding device characterized in that the second wedge piece moves with respect to the wedge piece by the spring means to always form a rigid body between the fastener and the member to be fastened to hold the fastening state of the fastener. 2. The guide means is formed by forming a long groove at one end of the second wedge piece so as to engage with a bolt shaft of a fastener, and a pin fixed at the other end is passed through a hole provided in a leaf spring. ,
The fastening and holding device according to claim 1, wherein the urging means comprises a coil spring inserted between the second wedge piece and the plate spring and inserted into the pin fixed to the second wedge piece.