JP2006149948A - Wood-made laminated wood spring and wood-spring slatted board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wood spring provided with a sufficient strength, a durability and a flexible resiliency attributed only to bending of a strip even if a laminated board made of conifer is used as a material of a leaf spring, in a wood-spring slatted board used in a bed and a chair and a wood-made leaf spring used for the same. <P>SOLUTION: Two laminated-wood-made strips 2a and 2b gently curved upward are overlapped with each other to cross at their intermediate part, or the center part with their posture reversed vertically opposite to each other, and the lower leaf or the upper leaf at the two ends, or preferably only the lower leaf at the end is secured to a frame member 11. When one of the two strips 2a and 2b functions as the lower leaf on one side, the one plate functions as the upper leaf on the other side. Accordingly, when only the end of the strip on the lower side is fixed to the frame member 11, the other end of the strip on the other side is in a free state, and resiliency following the bending of the strips 2a and 2b is not restricted. Thus, more flexible resiliency is obtained without increasing bending stress on the basis of the principle of the laminated spring. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wood spring slat used for a floor of a bed or a seat plate of a chair and a curved strip-shaped wooden strip leaf spring (also referred to as “wood spring”) as a component thereof.

  Appropriate elasticity or flexibility is imparted to the bed floor or chair seat so that a comfortable sleeping and sitting comfort can be obtained when a person lies down or sits down. As one of means for imparting elasticity or flexibility, a wood spring slat is used in which a large number of wooden strips bent in a loose arc shape are arranged in parallel. Since wood springs are made of wood, they are gentle to humans, have excellent touch and vibration absorption, and have excellent air permeability because they have a gap between adjacent strip springs.

  A wood spring obtains a spring effect by utilizing a repulsive force against a load in a bending direction of a curved wooden strip. Wood is a natural material, and its strength and elasticity vary depending on the type, so the thickness and width of the board must be determined according to the nature of the wood. In general, hardwoods are strong and coniferous trees are low. When the strength of the wood is low, it is necessary to increase the thickness of the plate in order to avoid breakage, but the strength is proportional to the square of the plate thickness, whereas the deflection is proportional to the cube of the plate thickness. When the plate thickness is increased, there is a problem that the elasticity as a spring is lost. For these reasons, hardwoods such as beech, oak, and tamo are conventionally used as the material for wood springs.

  In addition, in a wood spring that uses the bending of a strip spring, when the strip is bent, the end of the strip is expanded, that is, when the strip is curved, the span (horizontal distance between both ends) is short. In other words, a phenomenon occurs in which the length becomes longer when the shape becomes linear. Wood spring snowboard is a structure in which a large number of curved strip springs are attached to the frame material, but if the free expansion and contraction of the strip springs is hindered by this attachment part, it will not be able to flex smoothly, and the bed This reduces the comfort of sleeping and sitting when used on a chair.

  As the structure for attaching the end portion of the strip spring to the frame member, those disclosed in Patent Documents 1 and 2 adopt a structure in which both ends of the strip leaf spring are inserted into receiving portions provided on the support member. Patent Documents 3 and 4 employ a structure in which both ends of a belt spring are supported by curved bending members or rubber support members.

Patent Document 3 discloses a laminated leaf spring having a structure in which a spring-like auxiliary member is superposed on the lower side of a spring-like plate member and both are fixed by a ring-shaped fixture.
Registered Utility Model No. 3039256 Registered Utility Model No. 3066111 JP 2002-191475 A JP 2004-215717 A

  By adopting the above-described conventional strip spring mounting structure, it is considered that the longitudinal expansion and contraction accompanying the deflection of the strip spring can be absorbed to some extent. However, in the structures of Patent Documents 1 and 2, it is necessary for the band plate to slide and move at the support portions at both ends of the band plate spring acting with a large surface load, and the smoothness is not sufficient. In addition, this structure is troublesome in attaching the band spring to the frame member. On the other hand, in the structures shown in Patent Documents 3 and 4, since it is necessary to further provide an elastic member at the end of the strip spring, the mounting structure becomes complicated, and there is a problem that the structure becomes expensive or easily damaged.

  Since wood springs are made of natural wood, there is a tendency that the necessary elasticity (flexibility) cannot be obtained if sufficient strength and durability are to be imparted. The mounting structures of Patent Documents 3 and 4 have the advantage that this lack of elasticity can be compensated, but it is clear that a sufficient elasticity can be obtained only by bending of the strip.

  In addition, when conifers are used as the material, the plate thickness increases due to strength, and the elasticity decreases. In order to avoid this problem, it is conceivable to adopt a superposition structure as shown in Patent Document 3, but when such a superposition leaf spring is adopted, smooth sliding movement of the superposition surface is obstructed. Without adopting a structure that maintains the overlapping state, the effect of adopting the stacked leaf spring is lost. Patent Document 3 does not show an effective solution to this problem.

  The present invention solves the above-mentioned various problems of the conventional structure at once, and even when a softwood laminate is used as the material of the strip spring, only sufficient strength and durability and flexure of the strip are obtained. It is an object to obtain a wood spring that can be given flexible elasticity.

  In the present invention, two strips 2a and 2b made of laminated wood that are gently curved upward are overlapped with each other in a state where they are crossed so as to be turned upside down at the middle part, commonly the central part, The above-mentioned problem is solved by adopting a structure in which only the lower layer or upper layer at both ends, preferably only the end of the lower band plate is attached to the frame member 11.

  In the two strips 2a and 2b intersecting in the vertical direction at the center, the strip that is the lower layer on one side is the upper layer on the other side. Therefore, in the state where only the end portion of the lower layer strip plate or only the end portion of the upper layer strip plate is attached to the frame member 11 at both ends of the overlapped strip plates, the other end portions of the respective strip plates are in a free state. Therefore, the expansion and contraction accompanying the bending of the strips 2a and 2b is not restricted at all. And since one wood spring is formed by two superposed strips, more flexible elasticity can be obtained without increasing the bending stress due to the principle of the laminated leaf springs. Thereby, the wood spring provided with the flexible elasticity required in order to obtain a comfortable sleeping comfort and sitting comfort using the softwood laminated material which has been difficult to adopt conventionally can be obtained.

  And by adopting a structure in which the constricted portion 8 provided in the other band plate 2b is inserted and intersected with the long hole 7 provided in one band plate 2a at the intersecting portion of the two band plates to be overlapped, While avoiding the strength reduction of the strips 2a and 2b at the intersecting portion 15, it is possible to realize a structure capable of sliding movement between the strips 2a and 2b at the intersecting portion.

  Attachment of the laminated leaf springs 1 to the frame member 11 is performed by connecting the end portions of the strips that are the lower layer or the upper layer at both ends of each laminated leaf spring 1 to the attachment bar 12. Preferably, the end portions of the lower layer are connected. With this structure, the two strips 2a and 2b that are overlaid are in a state in which the respective front ends are simply placed on the base end on the other side. The sliding movement between the strips is performed more smoothly.

  Further, the position inside the frame member 11, preferably the center of both sides 12, 12 to which the strips 2 a, 2 b are attached, the distance to the lower surface of the laminated leaf spring 1 is a deflection amount in a range where the strips 2 a, 2 b are not damaged. By providing the bar-like or plate-like stopper member 14 capable of receiving an excessive deflection load, it is possible to prevent the wood spring from being damaged by an unexpectedly excessive load.

  The wooden laminated leaf spring according to the invention of claim 1 of the present application is configured such that two wooden curved strips 2a and 2b each having a stepped bent portion 4 corresponding to a plate thickness at an intermediate portion are vertically moved by the stepped bent portion. A wooden laminated leaf spring characterized in that it is crossed and overlapped so as to be slidable in the longitudinal direction at its mating surface.

  The laminated leaf spring according to the invention of claim 2 of the present application is the laminated leaf spring according to claim 1, wherein one of the two strips 2a has a slot 7 in the longitudinal direction of the strip in the stepped bent portion. And the other 2b is provided with a constricted portion 8 in the stepped bent portion, and the two strips intersect each other in the vertical direction with the constricted portion inserted through the elongated hole. .

  Further, the wood spring saw according to claim 3 of the present application includes a frame member 11 and a plurality of stacked leaf springs 1 according to claim 1 or 2, wherein the plurality of stacked leaf springs are each stacked leaf spring. The wood springs are characterized in that the ends of the strips, which are the lower layer or the upper layer, are connected to the frame member and arranged in parallel with each other.

  The wood spring saw according to claim 4 of the present application is characterized in that, in the wood spring saw according to claim 3, the frame member is provided with a stopper member 14 that defines a deflection amount of the overlap leaf spring. It is what.

  According to the present invention, a wood spring saw having a flexible elasticity necessary for obtaining a comfortable sleeping comfort and sitting comfort can be realized without adopting a complicated structure for the attachment portion of the belt spring 1 and the frame member 11. be able to. Moreover, the wood spring snowboard provided with sufficient intensity | strength and durability, and flexible elasticity can be manufactured using the laminated material of the conifer which was difficult to employ | adopt conventionally. Therefore, according to the present invention, there is an effect that it is possible to provide a wood spring sword which is safe and highly durable, has a simple structure that can provide a comfortable sleeping comfort and sitting comfort when used in a bed or a chair, and is easy to assemble.

  In addition, two strip springs are stacked, and one end of the strip is placed on the other base end, so that one of the stacked strips 2a and 2b is broken by any chance. However, the wood spring is not immediately damaged, and by adopting the structure of claim 4, the wood spring 1 is stopped by the stopper member 14 before reaching the stress at which the strips 2 a and 2 b break. Therefore, even when an unexpected load is applied, it is possible to avoid breakage of the wood spring, which is actually safe and can give a sense of security to the eye.

  Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are perspective views showing one and the other of the strips forming one wood spring, FIG. 3 is a perspective view showing a state in which the two strips are crossed, and FIG. FIG. 5 is a perspective view showing an example of the wood saw of the present invention that has been completed. FIG. 5 is a perspective view showing a state in which the base ends of the respective band plates are attached to the frame member and superimposed.

  The two strips 2a and 2b that form one laminated leaf spring 1 are strips of a laminated structure in which a plurality of thin timbers are laminated and bonded, and are formed into the shapes described below at the time of lamination. is there.

  That is, the strips 2a and 2b are generally upwardly convex and loosely arcuate, and have a stepped bent portion 4 corresponding to the plate thickness at the center thereof, and a bolt insertion hole 3 for attachment is provided at the base end. It has been. The radius of curvature of the base end side half 5 from the stepped bending portion 4 is smaller than the radius of curvature of the tip end side half 6 by a plate thickness. Therefore, when the tip end half 6 is superimposed on the base end side half 5, It has an arc shape so that the mating surfaces are in close contact with each other without any gap.

  An elongated hole 7 that is elongated in the longitudinal direction of the band plate passes through the stepped bent portion 4 of one side 2a of the band plate, and the width of the band plate is set to the width of the elongated hole 7 in the stepped bent portion 4 of the other 2b. A constricted portion 8 having a width to be slidably fitted therein is formed. In addition, the length of the long hole 7 is longer than the width | variety of the strip 2b.

  As shown in FIG. 3, the two band plates 2a and 2b are formed by inserting the band plate 2b provided with the constricted portion 8 into the long hole 7 of the other band plate 2a. The planes of the plates are made to cross each other by being in the same direction. In this state, the base end side half 5 of the two strips 2a, 2b is located below the distal end side half 6 of the other strip, and if they are brought into close contact with each other in the state of FIG. 3, the two strips 2a, 2b The leading end side halves 6 are overlapped on the base end side halves 5 of the other band plates so as to be freely slidable in the longitudinal direction by the length of the constricted portion 8.

  As shown in FIGS. 4 and 5, a plurality of stacked leaf springs 1 composed of two strips 2 a and 2 b that are stacked one above the other in this intersecting state are connected to two mounting bars 12 and connecting bars 13 connecting both ends thereof. Is attached to the frame member 11 provided with the wood spring snowboard of this invention shown in FIG. The frame member 11 shown in the figure is provided with a stopper bar 14 that supports both ends of the connecting bar 13 and restricts the downward deflection of the central portion of the laminated leaf spring 1.

  As shown in FIG. 4, each of the leaf springs 1 is attached to the frame member 11 by inserting a wood screw 9 into a bolt insertion hole 3 (see FIGS. 1 and 2) provided in the strips 2a and 2b. It is done by fastening to. By interposing an elastic sheet such as a rubber sheet between the mounting bar 12 of the fastening portion and the strips 2a and 2b, the vertical swing of the strips 2a and 2b at the mounting portion can be smoothly performed. Instead of interposing a rubber sheet or the like, the upper edge of the mounting bar 12 may have a loose arc cross section.

  Naturally, the length of the laminated leaf spring 1 and the size of the frame member 11 are adjusted to the size of the use of the wood spring saw 10 manufactured thereby, and depending on the load and length applied to the wood spring 1. Naturally, the thicknesses and widths of the strips 2a and 2b are different.

  When a person sits or sleeps on the wood spring slat 10 thus obtained, a downward force acts on the laminated leaf spring 1 to bend downward. The band plates 2a and 2b constituting the wood springs in accordance with this bending are expanded and contracted in the longitudinal direction, but each band plate is only fixed at the base end, and the distal end is in a free state. Can expand and contract freely. In addition, slipping also occurs on the mating surfaces of the two strips as a result of this bending, but this slipping is not limited by the movement of the constricted portion 8 in the long hole 7, and these slips are not limited. Since the movement occurs in a distributed manner over the entire overlapping surface of the strips 2a and 2b having a small surface load, smooth and flexible elasticity can be obtained.

  When an excessive force is applied to some of the laminated leaf springs, the laminated leaf springs are greatly bent and abut against the stopper bar 14, and further bending is restricted, so that a situation in which the wood spring is broken is avoided. be able to. In order to reduce the impact when the wood spring comes into contact with the stopper bar 14, a cushioning material such as a rubber sheet may be attached to the upper surface of the stopper bar 14.

  In addition, the wood spring snowboard of this invention has the characteristics in the structure of the wood spring 1 used for this, The attachment structure and arrangement | positioning form to the frame material 11 are free. Further, the shape and structure of the frame member 11 are not limited to those shown in the figure. For example, when the frame member 11 is used on a tatami mat, it can be a frame member provided with only two mounting bars 12. Reduces the height of the cross so that the floor surface functions as a stopper member. In addition, in order to prevent displacement of the end of the strip of each wood spring in the width direction, a cylindrical sheath is attached, or a groove, a long hole, a pin or a ridge is formed on the overlapping surface of the two strips. It is also possible to provide a guide consisting of a pair. Further, the mounting bar 12 may be configured such that only the mounting part of the wood spring 1 is raised and the upper edge having a lower part between them is uneven.

A perspective view of one of the strips forming one wood spring The other perspective view The perspective view which shows the state which crossed two strips The perspective view which showed the state which attached the base end of a strip and attaching it to a frame material Perspective view showing this example of wood

Explanation of symbols

1 Laminated leaf spring
2a, 2b Strip 4 Bently bent part 7 Long hole 8 Constricted part
11 Frame material
12 Mounting bar
14 Stopper member

Claims (4)

  Two wooden curved strips (2a, 2b) with a stepped bending portion (4) corresponding to the plate thickness in the middle are crossed vertically at the stepped bending portion, and at the mating surface in the longitudinal direction. A wooden leaf spring that is slidably stacked.   One of the two strips (2a) is provided with an elongated hole (7) in the longitudinal direction of the strip at the stepped bent portion, and the other (2b) is provided with a constricted portion (8) at the stepped bent portion, 2. The laminated leaf spring according to claim 1, wherein two strips intersect each other in a vertical direction with the constricted portion inserted through the elongated hole.   A frame material (11) and a plurality of the laminated leaf springs (1) according to claim 1 or 2 are provided, and the plurality of laminated leaf springs are strip plates that are lower layers or upper layers at both ends of each laminated leaf spring, respectively. Wood spring saws that are connected in parallel to each other with their ends connected to the frame material.   The wood spring saw according to claim 3, wherein the frame member includes a stopper member (14) that defines a bending amount of the laminated leaf spring.

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