JP2006105383A - Wood fastening and holding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem on loosening in a conventional case where a bolt and a nut or the like are fastened by using reaction force in deflection of an elastic member, though it is proposed to prevent play generally found on a wood fastening part, because of loosening of a fastener by natural seasoning, or abrasion during use in a case of furniture. <P>SOLUTION: In this wood fastening and holding device by the bolt and nut or the like, the nut has a nut-shaped portion and a cylindrical boss portion, a forced spring leaf nut having a function easily movable to one side and hardly movable to the other side, is press-fitted to the cylindrical boss portion in the direction to be easily movable to a wood portion side, further a plurality of disc springs are mounted to press the forced spring leaf nut to the wood portion direction, the forced spring leaf nut is constantly moved to the wood portion side in accompany with the decrease in dimension of a wood portion to keep a fastened state, and further a wire is mounted to hold the disc springs in a pressurized state with a closely contact state to unitize the same. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an apparatus for maintaining a fastening state of a fastening portion by a bolt, a nut or the like used for fastening wood.

In many cases, wood used in residential buildings or furniture has a moisture content that changes due to natural drying, so-called wood fraying occurs, and looseness is often generated at the joining sites of the wood. In addition, in furniture, wear of the bonded portion due to pressure during use is also caused.
Therefore, many proposals have been made for the purpose of preventing loosening of the screwed portions of the bolts and nuts at the coupling site or preventing looseness. For example, Japanese Patent Application Laid-Open No. 11-350598 “Washer and fixing structure of wood using this washer”, Japanese Utility Model Registration No. 3070966 “Architecture wing board bolt loosening prevention device”, Japanese Patent Application Laid-Open No. 2001-317528, “Timing fitting for wood thinning”, etc. This is a typical proposal. All of these utilize the deflection of the elastic member.
Therefore, since the elastic member is bent and the reaction force tries to prevent loosening of the bolt and nut, the tightening force naturally decreases as the thickness dimension of the fastened member decreases. . Therefore, it does not seem to be useful for preventing looseness and play. In view of this, the present inventor disclosed an invention of a device that always keeps the fastening firmly in response to the looseness of the member to be fastened in Japanese Patent Application No. 2002-119936 “Wood Fastening Holding Device”. The apparatus includes a main spring that presses in a direction away from each other between a fastener and a member to be fastened, two cylindrical cams having a lead cam surface, and a rotating spring means that biases the cam surface in a direction in which the cam surface becomes higher. The wood fastening and holding device is characterized in that the fastening is always held by always filling the gap generated by the fray of the fastened member with a rigid body.

Many proposals use the reaction force of the elastic member to prevent the fastening portion from loosening and rattling, but the fastening force decreases as the thickness of the member to be fastened decreases. Therefore, as described above, the present inventor has proposed a device in which the fastening device maintains a rigid structure even if the thickness dimension of the fastened member is reduced by interposing two cylindrical lead cams.
However, the proposed fastening and holding device is complex and expensive. Nowadays, it is also an era when manufacturing costs are strictly questioned, and a solution in that sense has been desired.

  In order to solve the above-mentioned problem, in a wood part fastening device that is fastened by a bolt that penetrates the wood part and a nut that is screwed to the bolt, the nut screwed to the bolt is a nut-shaped part and a cylindrical boss part that is smaller in diameter than the opposite side of the nut. A push spring plate nut is press-fitted into the cylindrical boss portion so that it can be easily moved in one direction of the boss axis but difficult to move in the opposite direction in the direction of easy movement to the wood portion side. A plurality of disc springs are arranged between the nut and the nut-shaped part, and a ring-shaped spacer is arranged between the push-in spring plate nut and the wooden part to follow the gradual increase in the gap between the bolt and the nut due to contraction or friction of the wooden part. Then, the pressing spring plate nut is moved to the wooden part side by pressurizing the disc spring, and the ring-shaped spacer is pressed against the wooden part to hold the fastening state with the bolt and nut, and further the nut shape of the nut Department and A cap that covers a plurality of disc springs, push-in spring plate nuts, ring spacers, etc. by fitting a hole in the bottom surface to the cylindrical boss between the springs and opening on the wood side is provided. A plurality of elongated holes are provided on the circumference, grooves are provided in the circumferential direction of the ring spacer, and a plurality of disc springs are pressed together with the push spring plate nut and the ring spacer to the nut-shaped portion side to obtain a laminated thickness. In the thinned state, the holding and holding device for a wooden part is characterized in that a wire is inserted into the slot of the cap cylindrical part and the groove of the ring spacer to maintain the pressure applied to the disc spring to form a unit. Invented the invention.

The main element of the present invention is a push spring leaf nut. It is a commercially available part which is a kind of general fastener spring defined by JAOS and is also called a push nut. This push spring leaf nut is used to fix the component by pushing it into an unthreaded stud and has a function that is difficult to remove in the reverse direction. The pull-out load in the reverse direction with respect to the load press-fitted into the shaft is approximately 10 times. There are shafts and holes, but this device uses shafts.
The present invention is characterized in that the above-mentioned push spring leaf nut is moved to the wood side by the disc spring of the elastic member following the decrease in the thickness dimension of the wood as the object to be fixed for some reason over time. Therefore, even in this proposal, the deflection of the disc spring will be reduced, but with the conventional structure, it will be difficult to move in the return direction when the fastening part is loosened or loose. Since the spring plate nut is functioning, the fastening state is maintained. It consists of a simple structure with very simple parts, and it is possible to keep the size of the unit in a small size. Therefore, the range of applications is wide from large houses to small furniture. Moreover, as already understood, it can be produced at a lower cost.

  Embodiments of the present invention will be described below with reference to the drawings.

Constitution

FIG. 1 is an exploded perspective view of a unit according to an embodiment of the present invention.
FIG. 2 is a sectional view of a unit according to an embodiment of the present invention.
FIG. 3 is a view from A in FIG.
FIG. 4 is a cross-sectional view of the unit according to the embodiment of the present invention in a state where the unit is assembled to the wooden part with bolts.
The structure of the parts will be described with reference to FIG. A cylindrical boss portion 8 and a nut-shaped portion 7 are formed on the nut 6, and the outer diameter of the cylindrical boss portion 8 is set slightly smaller than the opposite side dimension of the nut-shaped portion 7. A screw hole 9 is provided at the center. The cap 10 has a hole 12 in the bottom surface 11 and is fitted to the cylindrical boss portion 8. The opposite side has an opening 13. The cap cylindrical portion 14 has four long holes 15 formed on the same circumference. The long hole 15 has a long hole shape in the circumferential direction. The ring 16 is fitted into the groove (not shown) of the cylindrical boss portion 8 of the nut 6 from the inside of the cap 10 so that the nut 6 does not fall off the cap 10. The flat washer 17 is a spacer for removing the influence of the R shape because the shoulder 10 has an R in drawing processing of the cap 10. A plurality of disc springs 18 are used, and five in the embodiment. The disc springs 18 are preferably arranged in a so-called series. This is because a large amount of deflection can be set.
Next, there is a pushing spring leaf nut 19 which is in contact with the ring-shaped spacer 22. The push-in spring leaf nut 19 is a kind of a spring leaf nut and fastener spring which is also called a push nut. The inner diameter portion 20 has a dish shape slightly swollen than the outer diameter flat surface portion 21, and press-fitting into the mating shaft is from the side opposite to the swollenness. One has a function that is easy to move and difficult to move in the opposite direction, and is generally used for fixing parts. For example, according to a certain data of the pushing spring plate nut 19 having an inner diameter portion 20 of φ12, the press-fitting requires a force of 400 kg in the opposite direction. The pushing spring plate nut 19 is press-fitted in the middle of the cylindrical boss portion 8 of the nut 6, and the disc spring 18 presses the outer diameter flat surface portion 21.
In the present invention, the direction in which the push spring plate nut 19 is disposed must be such that it can easily move toward the ring-shaped spacer 22 that contacts the wood part 1 shown in FIG. However, since this case is not directly related to the invention, a description thereof will be omitted.
There is a groove 23 in the circumferential direction on the outer diameter of the ring-shaped spacer 22. The ring-shaped spacer 22 is pressed together with the push-in spring plate nut 19 and the disc spring 18 in the direction in which the stacked height of the disc springs 18 is lowered. Since the position of the groove 23 of the ring-shaped spacer 22 and the position of the plurality of elongated holes 15 of the cap 10 coincide with each other in the axial direction when pressurized to a predetermined size, the wire 25 is shown in FIGS. As shown, the unit 5 can be formed in a pressurized state by being skewered with the cap long hole 15, the groove 21, and the long hole 15 again. Since the wire 25 has a bifurcated shape, it passes through the elongated holes 15 at two locations on both sides of the cap 10.

Action

  The unit 5 shown in FIG. 2 is screwed with the bolt 3 to fasten the woods 1 and 2 as shown in FIG. The washer 4 is a normal plain washer. At this time, the plurality of disc springs 18 of the unit 5 are almost in close contact with each other, and the flat surface 24 of the ring-shaped spacer 22 is in contact with the surface of the wood 1. When the wire 25 is pulled out from the unit 5, the disc spring 18 is released and the pushing spring leaf nut 19 and the ring spacer 22 are pressed against the wood 1 side. For example, as shown in FIG. Even if is reduced, the disc spring 18 moves the push-in spring leaf nut 19 and keeps the fastened state. This is because the pushing spring plate nut 19 can easily move to the wood 1 side and has a function that is difficult to move in the opposite direction.

1 is an exploded perspective view of the unit of the embodiment of the present invention. FIG. 2 is a sectional view of the unit of the embodiment of the present invention. FIG. 3 is a view of FIG. Cross section of the attached state

Explanation of symbols

1, 2, wood 10, cap 16, ring 3, bolt 11, bottom surface 17, flat washer 5, unit 12, hole 18, disc spring 6, nut 13, opening 19, push spring leaf nut 7, nut shape portion 14, Cap cylindrical portion 20, inner diameter portion 8, cylindrical boss portion 15, long hole 21, outer diameter flat surface portion 22, ring-shaped spacer 23, groove 24, flat surface 25, wire

Claims (2)

  In a wooden part fastening device that is fastened by a bolt that penetrates the wooden part and a nut that is screwed to the bolt, the nut that is screwed to the bolt is composed of a nut-shaped part and a cylindrical boss part having a diameter smaller than the opposite side of the nut. The push spring plate nut that can be easily moved in one direction in the boss axis direction and difficult to move in the opposite direction is press-fitted in the direction that can be easily moved to the wood side, and between the push spring plate nut and the nut shape part. A plurality of disc springs are arranged, and a ring-shaped spacer is arranged between the push-in spring plate nut and the wood, and the disc spring is added following the gradual increase in the gap between the bolt and nut due to shrinkage or friction of the wood. An apparatus for fastening and holding a wood part, wherein the pushing plate nut is moved to the wood part side by pressure and the ring-shaped spacer is brought into pressure contact with the wood part to hold the fastening state by the bolt and the nut.   A cylindrical boss part between the nut shape part of the nut and the disc spring is fitted with a hole on the bottom surface, and a cap is provided on the side of the wooden part to cover a plurality of disc springs, push spring plate nuts, ring spacers, etc. The cap cylindrical part is provided with a plurality of elongated holes on the same circumference, the ring-shaped spacer is provided with a groove in the circumferential direction of the outer diameter, and a plurality of disc springs are pushed in. The nut shape together with the spring plate nut and the ring-shaped spacer In a state where the lamination thickness was reduced by pressing the part side, the unit was made by maintaining the pressure state on the disc spring by inserting a wire in the slot of the cap cylindrical part and the groove of the ring spacer The xylem fastening and holding device according to claim 1.

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