JP2002098129A - Spiral twist shaft body and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spiral twist shaft body and a method for manufacturing thereof in which a metal strip is overlapped and formed into a spiral structure and which can expand/contract in the axial direction and possesses practicability/functionality depending on the combination thereof. SOLUTION: The spiral twist shaft body 1 comprises a spiral twist structure (a spiral part 4) formed in equal pitch with two piece metal strips of required width being overlapped, and a configuration which allows two pieces 2, 2 of overlapped spiral twist structure to be movable in the axial direction, wherein further the metal strip of required dimension is used as a raw material, the metal strip cut off in required length is put on top one another and both ends thereof are fixedly held at specified location, the raw material is twisted by applying a turning moment to one end portion or both end portions thereof with holding spacing being kept constant, a part aside from both holding end portions is formed in equal pitch spirally, and then out of the holding end portions of the overlapping spiral twist shaft part piece, one holding end portion is removed, and the spiral twist shaft body 1 is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a helical torsion shaft having a configuration in which a belt-shaped metal plate member can be axially expanded and contracted by twisting, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, a shaft body whose length needs to be adjusted,
For example, in the case of a rod, a method is adopted in which a shaft body having a fitting structure is slid in the axial direction and fixed to a fitting structure at a required position so that the shaft body is not slid from the outside by a fixing means. In addition, a method of adjusting the length by using a screw number structure, for example, using a turnbuckle is one of the frequently adopted means.

[0003]

However, in the case of the above-mentioned system in which the rod is nested (fitting structure) to adjust the expansion and contraction, when the external force acting in the axial direction increases, the cross-sectional strength is increased. The shaft diameter becomes larger.
Further, in order to fix the insertion shaft at a predetermined position after the length adjustment, it is necessary to apply a frictional force for strongly fixing the insertion shaft from outside to the inserted shaft body. Therefore, in order to reduce the bulk, it is necessary to incorporate a lock mechanism by tightening friction by combining tapered sleeves, or to provide a structure in which a fixing force is applied from the outer shaft to the inner shaft by a set screw.

[0004] In the case of a turnbuckle type, shafts having two types of screw shafts having different screw directions of a right-handed screw and a left-handed screw are prepared, and the screwing directions of these shafts are different. It is configured by combining one member having a screw portion. Therefore, there is an advantage that the length can be easily adjusted by rotating the member having both the right and left screw portions, and the handling is easier than the former shaft body of the fitting slide structure, and the length adjustment can be performed finely. . However, there is a problem that it is necessary to provide two types of screw portions having different directions, and it is expensive.

The present invention has been made in view of the above-mentioned problems, and has a reasonable and functional function that can be expanded and contracted in the axial direction by forming a spiral structure by combining metal strips. It is an object of the present invention to provide a spiral torsion shaft and a method for manufacturing the same.

[0006]

In order to achieve the above-mentioned object, a helical torsion shaft according to a first aspect of the present invention includes a metal strip having a required width in a state where two pieces are overlapped. The spiral torsion structure is formed at a pitch, and the pieces of the spiral torsion structure superimposed are configured to be movable in the axial direction.

According to the present invention, the shaft body composed of two pieces spirally twisted at equal pitches is connected to a required member at one end of each of the pieces to perform the spiral torsion. By rotating the two pieces to each other or one of them, the torsioning two pieces can be axially slid by the helix to extend or contract the axially combined shaft. . And, since the shaft body is constituted by the two pieces twisted spirally, if a mechanism for preventing the rotation is added, it is possible to increase the sectional modulus even though the band plate is used. It is possible to obtain a rigid and lightweight shaft body. Therefore, if it is used for an application in which a large load does not act, it can be used as a shaft whose length can be freely adjusted.

It is preferable that one end of each of the combined spiral torsion portions is formed into a flat portion with a required length, and the flat portion is used as a connection portion with another article. Further, it is preferable that a fixing part having a fixing means is fitted on the combined spiral torsion part so that the two spiral torsion parts can be fixed at a required position by the fixing means. In this case, by attaching a connection member according to the purpose of use to a flat portion formed at both ends of the spiral torsion shaft body formed by combining the spiral torsion parts,
After setting to the required length as an extendable shaft, the two spiral torsion parts are fixed by the fixing means of the fixing part, for example, as an interval adjusting rod for keeping the stationary interval of the two articles constant Can be used. Of course, depending on the application, by attaching other parts integrally to the flat portion of the end as a member whose length can be adjusted, the object can be achieved with a simple configuration by adopting it for various applications.

Next, a method for manufacturing a helical torsion shaft according to a second aspect of the present invention is to use a metal strip having a required dimension as a raw material, stack the two metal strips cut to a required length, and position both ends at predetermined positions. In the fixed holding, the material is twisted by applying a rotational force to one end or both ends while keeping the holding interval constant, and a portion other than both ends to be held is formed in a spiral shape at an equal pitch, and thereafter, One of the holding ends of the overlapping spiral torsion shaft pieces is cut off, and both spiral torsion shaft pieces are formed so as to be movable in the axial direction along the spiral. And

In the present invention, a metal strip having a required outer diameter (plate thickness, band width, length) set in advance as a basic dimension of a shaft to be obtained is prepared as a raw material, and the raw material is prepared. Two sheets are superimposed, and both ends are fixedly held at a length suitable for processing, and a rotational force is applied to one end while keeping the holding interval constant. Thus, the belt-shaped material is formed into a spiral shape by being gradually twisted from one side to which the rotational force is applied. At this time, since the dimensions between both ends of the material are kept constant, the two materials are simultaneously plastically deformed spirally by the rotational force while tension is applied to the intermediate part other than the held part. It is done. Therefore,
The spiral leads formed in accordance with the rotation on the side to which the rotational force is applied become substantially constant, and the two overlapping materials are equally formed in the spiral torsion piece. At this time, it is preferable to consider the rotation speed of the material so that the material is slightly over the yield point and is not deteriorated by residual stress due to excessive stress. The rotation force can be applied to the material from both ends as needed. In this case, it is preferable that both sides are rotated in opposite directions at the same speed with the same rotational force.

[0011] Of the two holding ends of the spirally twisted piece thus spirally twisted, only one of the holding ends is cut off by, for example, press working or a disk cutter. By doing so, the helically shaped shafts are formed so as to be slidable with each other.

According to the present invention, the shaft portion is spirally formed by stacking and holding the two materials of the required dimensions at both ends and applying a rotational force to the shaft portion so that the shaft portion is always in the axial direction. Since twisting is performed while applying tension,
At the same time as the two strip-shaped materials are plastically deformed, their axes are automatically corrected and kept constant. As a result, it is possible to easily obtain a shaft body which is provided with a flat portion at the end and which is twisted in a spiral shape in which the axis is aligned in a straight line. At the time of this torsion processing, it is necessary to add a twist so that the spiral leads are equal, and by cutting off the flat end of each one, the two spirals are processed because they are overlapped and processed. The parts are the same in the helical portion, and when a rotational force is applied, the helical lead is movable in the axial direction, and the length of the shaft body can be freely expanded and contracted. Therefore, it is possible to mass-produce the helical torsion shaft having the function and effect according to the first aspect of the invention, and to provide the helical torsion shaft inexpensively.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of a spiral torsion shaft body and a method of manufacturing the same according to the present invention will be described with reference to the drawings.

FIG. 1 is an overall perspective view of a spiral torsion shaft according to the first invention, and FIG. 2 is an enlarged sectional view of the spiral torsion shaft.

The helical torsion shaft 1 of this embodiment is formed by laminating two blanks made of steel strips cut to the required outer dimensions and flatten the required length at both ends 5,5. The shaft portions 3 other than the end portions 5 and 5, which are flat portions, are twisted with required leads to form two spiral torsion shaft pieces 2 and 2 formed in the spiral portion 4 (the spiral of the present invention). (Corresponding to a torsion structure piece).

Such a spiral torsion shaft 1 is obtained by a manufacturing method described later, and the axis of the shaft constituted by the combined spiral torsion shaft pieces 2 is kept straight. There is no distortion such as bending, and the overall rigidity is maintained as long as there is no rigid external force. When the helical torsion shaft portion pieces 2 and 2 are applied with a turning force, the helical portion 4 (the shaft portion 3) slides in the axial direction by the lead of the helical portion 4 (shaft portion 3) to adjust the length dimension.

The helical torsion shaft 1 is used at the time of use.
A separate component, for example, a seat plate 11 having a required outer diameter and having a seat on an end face is attached to the end portions 5 and 5 of the two spiral torsion shaft pieces 2 and 2, and the equipment and the like are attached by the seat plate 11 (separate component). Can be used as a shaft body for regulating the distance via both seat plates 11, 11. In this case, since the length of the shaft body 1 can be adjusted by rotating one of the seat plates 11, the shaft body 1 can be used as a rod whose length can be adjusted. In order to fix the helical torsion shaft 1 with a fixed size, for example, as shown in FIG. 3, a sleeve 13 having a push screw 14 on the shaft 3 (corresponding to a fixing portion in the present invention) is covered. The screw screw 14 is screwed in a state where the dimensions are determined and the spiral torsion shaft pieces 2 are overlapped.
The movement can be fixed by applying a lateral pressing force to the two spiral portions 4. Of course, except for the pressing force by the push screw 14, the slide can be freely performed and the length dimension can be changed.

In order to mount a component separately on the end portion 5 as described above, the end portion 5 has a flat portion. For example, if the component to be mounted is made of plastic, the end portion 5 is attached to the shaft mounting portion. A flat mounting hole (which may be a bottomed hole) into which the screw 5 can be inserted and fixed is provided, and the end portion 5 of the spiral torsion shaft 1 may be inserted and fixed into the mounting hole.

For example, when the separate component is a member that acts in the axial direction, the spiral torsion shaft body 1 is formed into a shape that can be connected to a separate component having one end connected to the end portions 5 and 5, and the other end of the shaft core is formed. It can be used by connecting using a joint piece provided with a flat mounting hole into which the end can be inserted and fixed. In this case, even if a load is applied in the axial direction, the helical torsion shaft body 1 is constituted by combining the two helical torsion shaft pieces 2, 2. Since a large stress is applied to the force and the rigidity is high, the members can be opposed to each other while maintaining a strength superior to the physical axis. Also in such a method of use, it is preferable to adjust the length and fix the two helical torsion shaft pieces 2 and 2 by the same fixing means as in the above example.

In the description of the above embodiment, the use of the sleeve 13 with the push screw 14 as means for fixing the two helical torsion shaft pieces 2 is described. After the adjustment, a sleeve made of an easily deformable material such as aluminum is fitted as a material that can be fixedly used without re-adjustment, and after the length of the shaft body 1 is determined, the sleeve is removed. It is possible to adopt a method of fixing the movement at the spiral torsion portion by compressively deforming from the outside. Also,
For further simplification, a method in which the length is adjusted and then secured with a wire or the like may be adopted. If such a fixing method is adopted, it can be provided at low cost. Such a method is convenient when it is handled fixedly. Adopting such a combination is effective, for example, in determining the dimensions of a formwork for concrete casting often used in construction sites.

Next, a specific example of a method for manufacturing the spiral torsion shaft 1 of the present invention will be described with reference to FIGS.

First, as shown in FIG. 4A, two steel strips having the same outer dimensions as required for the required outer diameter of the desired spiral torsion shaft 1 are used as the raw material 20. Prepare sheets. As the steel strip, for example, one obtained by cutting a steel sheet having a required thickness is used. The outer diameter d (see FIG. 2) of the spiral torsion shaft body 1 to be obtained here is approximately the width of the strip. The standard total length of the shaft (the shortest length after completion of the product) is basically the total length L of the steel strip to be prepared. The plate thickness can be set arbitrarily according to the purpose of use. The thickness is preferably as thin as possible in order to facilitate processing.

The prepared steel strip (hereinafter simply referred to as material 20)
) Is to form mounting holes 6 at both ends. Next, the two blanks 20 are mounted on a separately prepared twisting apparatus. As the torsion processing device 30 used here, one having a configuration as shown in FIGS. 6A and 6B is used. Therefore, a specific example of the twisting device will be described next.

The torsion processing apparatus 30 includes a rotation holding means 32 rotatably supported by a bearing fixedly mounted at one end on a base 31, and moves axially in opposition to the rotation holding means 32. It comprises a possible fixed holding means 36 and a holding interval setting means 40. The rotation holding means 32 is rotatably held at a fixed position in the axial direction by a bearing portion 33a of a holding block 33 to be fixed, projects the holding portion 34a in the axial direction from the bearing portion 33a, and opposes the other end. The rotary holder 34 is provided with the rotary handle 35 attached so as to protrude outward in the direction. The rotating holder 3
4 is provided on the mounting holding surface 34 along the rotation axis.
The holding pin 34c is implanted on the mounting holding surface 34b so as to intersect on the axis. The fixed holding means 36 is a fixed block 38 which is slidably supported on a guide rail 37a formed along a guide block 37 provided on the base 31 in the longitudinal direction so as to be movable in the axial direction.
And the rotation holder 3 at the center of the fixed block 38.
4 and a fixed holder 39 whose axial center line is matched, and a mounting surface 39 formed along the axis of the fixed holder 39.
As in the case of the rotary holder 34, a holding pin 39b is implanted in a at a position crossing the axis. The fixed holder 39 of the fixed holding means 36 has a distal end of a screw shaft 42 which is screwed into a female thread provided on an end plate 41 attached to the other end of the base 31 (an end opposite to the holding block 33). The fixed block 38 is held by rotating the other end of the screw shaft 42 with the handle 43 so that the fixed block 38 can advance and retreat along the guide rail 37 a of the guide block 37 provided with the base 31. The interval setting means 40 is connected.

As shown in FIG. 4 (b), the previously prepared raw material 20 has two mounting holes 6, 6 at both ends thereof in a state of being stacked, and holding surfaces 39a of the fixed holder 39 and the rotating holder 34, respectively. , 34a and holding pins 39b, 34c
To be held. At this time, the fixed block 38 of the fixed holding means 36 shown in FIG. 6A is moved by rotating the screw shaft 42 of the holding interval setting means 40 with the handle 43 to hold both the fixed holder 39 and the rotating holder 34. The position is set so that the mounting holes 6 of the material 20 match the pins 39b and 34c. In addition, both ends of the material 20 are fixed.
When the material 20 is held on the holding surfaces of the rotating holders 39 and 34, the material 20 is positioned so as not to easily come off.

Next, as shown in FIG. 4 (c), when the handle 35 of the rotation holding means 32 is rotated, the rotation holder 34 is rotated to rotate one of the materials 20 held and twisted. Power is applied. Then, material 20
The other end is engaged and held on the holding surface 39a of the fixed holder 39 by the holding pin 39b and the mounting hole 6, and the one end is rotated by the rotary holder 34, so that tension is applied to the fixed end. Material 2
The middle part of 0 is twisted with two sheets stacked.

When the rotary holder 34 is rotated a required number of times in this state, the intermediate portion is formed in a spiral shape by the torsional force applied to the material 20. In this processing state,
Holding pin 39b between fixed holder 39 and rotating holder 34,
Since the distance between 34c is always constant, the material 20 is helically plastically deformed while being elongated in the axial direction as the material 20 is twisted. Therefore, the twisted material is always tensioned due to the tensile force acting in the axial direction during processing, and since the two sheets are stacked, both are kept in close contact with each other and the number of twists depends on the number of twists. Thus, the leads are spiraled with almost equal leads, and at the same time, the torsion axis is formed while keeping the axial center straight (see FIG. 4D). As a result, the obtained intermediate product of the spiral torsion shaft body automatically becomes straight and spiral.

After the twisting process is completed in this manner, the screw shaft 42 of the holding interval setting means 40 is rotated by the handle 43 to move the fixed block 38. When the tension is removed, the spiral torsion shaft body is removed. Intermediate products can be easily removed. At the time of this twisting process, a large amount of springback is assumed in advance in consideration of the amount of springback accompanying the process. In addition, the amount of twist is set so that both ends are aligned on the same surface so that the product can be easily handled, and the operation is completed.

In the intermediate product in which the spiral portion 4 is formed by the twisting process, the two flat portions of both end portions 5 and 5 are flat because both of them overlap, as shown in FIG. One of the opposite flat portions at both ends 5, 5 of the spiral torsion shaft pieces 2, 2 is cut off. As this processing, for example, the flat portion on the side to be cut off is pulled up from the overlapping surface so as to float from the flat portion of the other shaft piece, and cut by a cutter at the boundary portion with the spiral forming portion (spiral portion). Or cut with a disk grinder.

The helical torsion shaft pieces 2, 2 which have been stacked in this way have their opposing ends 5, 5 cut off at their flat portions, so that each helical torsion shaft piece 2, 2 has a helical shape. The shaft portion 3 is slidable along the helical lead, thereby completing the helical torsion shaft 1 that can expand and contract in the axial direction.

The helical torsion shaft 1 thus obtained
As described above, an appropriate work hardening is generated by forming the strip in a spiral shape, and the work hardening and the torsion structure make it possible to finish the shaft as a whole with high rigidity. Moreover, since the two shaft pieces are formed by twisting at the same time, the leads are finished at the same pitch, and when a rotational force is applied, the leads are mutually slid in the axial direction by a spiral to reduce the length of the shaft body. It can be stretched.

Therefore, as described above, the spiral torsion shaft 1 is attached to both ends, that is, to the end 5 having a flat portion of each spiral torsion shaft piece 2 by being combined with the flat portion. By separately attaching attachment parts, and attaching them to a target device or member using the attachment parts, the attachment body can be used as a shaft (rod) with an adjustable attachment interval. The helical torsion shaft 1 can be used as a part such as a turnbuckle by being interposed in the middle part of the rod depending on the shape and structure of the parts attached to both ends.

Although the present embodiment has been described by using a strip cut from a steel plate as a raw material, if a flat strip having a required dimension is used instead of the strip by using a drawn material, the strip may be formed from the steel plate. The cutting process can be omitted, and the loss at the time of cutting to a required size can be eliminated, and the economic effect can be improved. Further, at the time of the torsion processing by the spiral torsion processing apparatus 30, it is also possible to perform the torsion processing by gripping both ends of the material with a clamp. By doing so, the mounting hole processing can be omitted. Further, in the description of the above embodiment, the method of applying a rotational force to one end to twist the material in a spiral torsion process has been described, but the material is rotated from both ends as necessary. It is also possible to do. In this case, it is preferable to apply the same rotational force from both.

The helical torsion shaft according to the present invention can be used not only as the shaft having an adjustable length as described above but also as an article in other fields. It can be used for various purposes by facilitating attachment (connection) to other articles by utilizing.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of one embodiment of a spiral torsion shaft according to the present invention.

FIG. 2 is an enlarged cross section of a spiral torsion shaft body.

FIG. 3 is a view showing an example in which a fixing sleeve is attached to the spiral torsion shaft body of the present invention.

4 (a) to 4 (d) are views for explaining a processing procedure of the shaft body of the present embodiment.

FIG. 5 is an explanatory view of cutting an end of an intermediate product having been subjected to a spiral torsion process into a product.

FIGS. 6A and 6B are views showing an embodiment of the apparatus for twisting a spiral torsion shaft according to the present invention, wherein FIG. 6A is an overall perspective view, and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spiral torsion shaft 2 Spiral torsion shaft piece 3 Shaft 4 Spiral part 5 End (flat part) 6 Mounting hole 11 Seat plate 13 Sleeve 14 Push screw 20 Material 30 Twist processing device 32 Rotation holding means 33 Holding Block 34 Rotating holder 34c, 39b Holding pin 35 Handle 36 Fixed holding means 38 Fixed block 39 Fixed holder 40 Holding interval setting means

Claims (4)

[Claims] A helical twist structure is formed at equal pitch in a state in which two metal strips of a required width are overlapped, and the helical twist structure pieces overlapped are movable in the axial direction. A spiral torsion shaft body characterized in that: 2. The spiral torsion shaft according to claim 1, wherein one end of each of the combined spiral torsion portions is formed into a flat portion with a required length, and the flat portion is used as a connection portion with another article. body. 3. The combined spiral torsion part is fitted with a fixing part having a fixing means so that the two spiral torsion parts can be fixed at a required position by the fixing means. Or a helical torsion shaft according to 2. 4. A metal strip having required dimensions is used as a material,
The two metal strips cut to the required length are overlapped with each other, and both ends are fixedly held at predetermined positions, and the material is twisted by applying a rotational force to one or both ends while keeping the holding interval constant. A portion other than both ends to be formed spirally at a constant pitch, after which, of the holding end portions of the overlapping spiral torsion pieces, one of the holding end portions is cut off,
A method for manufacturing a helical torsion shaft, wherein the two helical torsion parts are formed so as to be movable in the axial direction along the helix.