JP7749415B2 - tensioning device - Google Patents

Description

The present invention relates to a wire tensioning device that tensions linear members such as wires and ropes.

One example of a conventional wire tensioning device is described in Patent Document 1. The wire tensioning device disclosed in Patent Document 1 comprises a clamp that is attached to a support pole and a main body attached to the clamp. The main body comprises a frame attached to the clamp, a shaft with both ends rotatably supported by the frame and to which the wire is connected, and a ratchet mechanism that switches between a state in which the shaft's reverse rotation is restricted and a state in which it can rotate freely.

The ratchet mechanism is composed of a pawl-type one-way clutch and includes a plurality of teeth on one end of the shaft that serve as a locking member, and a rocker lever that serves as a locked member with a pawl that engages with the teeth. The teeth and pawl are designed so that the pawl can ride over the teeth when the shaft rotates in the direction to wind the wire, and engage with each other when the shaft rotates in the reverse direction to unwind the wire, restricting reverse rotation of the shaft. Hereinafter, the rotation direction of the shaft in which the wire is wound will be simply referred to as the winding direction. The rocker lever is supported by a frame so that it can swing freely, and swings between a winding position where the pawl can engage with the teeth and a retracted position where the pawl disengages from the teeth. The rocker lever is also biased toward the winding position by a return spring consisting of a torsion spring provided between the rocker lever and the frame.

In this wire tensioning device, the wire is wound onto the shaft by engaging a tool with the other end of the shaft and rotating the shaft in the winding direction. At this time, the teeth of the shaft press against the pawl of the ratchet mechanism, causing the swing lever to swing toward the retracted position against the spring force of the return spring, and the pawl passes over the teeth, causing the shaft to rotate.
When the wire is wound around the shaft, the wire pulls the shaft, causing a force to rotate it in the reverse direction. At this time, the pawl of the ratchet mechanism engages with the teeth, preventing the shaft from rotating.

Design Registration No. 1384389

The wire tensioning device described in Patent Document 1 requires a swing lever and return spring in addition to the shaft, resulting in a large number of parts, a complex structure, and high manufacturing costs. Furthermore, because the pawl is constantly pressed against the tooth by the spring force of the return spring, the tooth must push the pawl up against the spring force of the return spring when winding the wire, which creates a large resistance.

The object of the present invention is to provide a wire tensioning device that has a simple structure, can keep manufacturing costs low, and has low resistance when winding up a linear member.

To achieve this objective, the wire tensioning device of the present invention comprises a main body attached to a support, a rotating shaft to which the end of the linear member to be installed is connected and which is arranged on the main body to rotate freely in both directions for winding and unwinding the linear member, and a rotation stopping means for stopping the rotation of the rotating shaft, wherein the rotation stopping means has a locking member attached to the rotating shaft and a locked member attached to the main body that stops the rotation of the rotating shaft when locked by the locking member. In this wire tensioning device, the rotating shaft is movable relative to the main body in both the tensioning and relaxation directions of the linear member, and the locking member is locked to the locked member when the linear member is tensioned and can be released from the locked member when the linear member is relaxed.

In the wire tensioning device of the present invention, the main body may have a pair of side wall portions having through holes through which both ends of the rotating shaft are inserted, and a winding space formed between the side wall portions to accommodate the linear member wound around the rotating shaft, and a gap may be formed between the inner surface of the through hole and the rotating shaft to allow the rotating shaft to move freely relative to the main body.

In the wire tensioning device of the present invention, one end of the rotating shaft has a protruding portion that protrudes outward from one of the pair of side wall portions toward the outside of the main body, the locking member has a plurality of claw pieces that protrude radially outward from the protruding portion of the rotating shaft, and the locked member protrudes from the outer surface of the one side wall portion and may engage with the claw pieces when the linear member is tensioned.

In the wire tensioning device of the present invention, of the through holes formed in the pair of side wall portions, at least the through hole through which the end of the rotating shaft on the side where the locking member is provided is inserted may be circular.

In the wire tensioning device of the present invention, of the through holes formed in the pair of side wall portions, at least the through hole through which the end of the rotating shaft on the side where the locking member is provided is inserted may be formed in an elliptical shape extending in the tensioning direction and relaxation direction of the linear member, with an opening width that allows the end of the rotating shaft to be inserted loosely.

In the wire tensioning device of the present invention, the other end of the rotating shaft may be provided with an engaging portion that detachably engages with a tool that rotates the rotating shaft.

In the wire tensioning device of the present invention, the interlocking member may be composed of a plate member fixed to the outer surface of one of the side walls, and may have a window hole capable of accommodating the interlocking member, with an interlocking portion formed on the inner surface of the window hole that engages with the claw piece when the linear member is tensioned.

In the wire tensioning device of the present invention, the engaged member may be formed by a protrusion protruding from the outer surface of one of the side walls, and the protrusion may be formed in a position that engages with the claw piece when the linear member is tensioned.

In the wire tensioning device of the present invention, the locked member may be movable relative to the main body between a locked position where the locking member is locked by tensioning the linear member, and an unlocked position where the locked state is released, and may include an elastic biasing member that biases the locked member toward the locked position. This elastic biasing member may be a spring such as a leaf spring or a coil spring, or may be a member such as rubber that generates a resilient force when compressed.

In the wire tensioning device of the present invention, a clamp may be connected to the main body, the support body may be a pole, and the main body may be attached to the pole by clamping the pole. Furthermore, the linear member may be any member that can be wound up and unwound by forward and reverse rotation of the rotating shaft, and may be, for example, a wire, rope, or chain.

The present invention provides a wire tensioning device that has a simple structure, allows for low manufacturing costs, and has low resistance when winding the wire.

FIG. 1 is a perspective view of a wire tensioning device according to the present invention, seen from one side. FIG. 2 is a perspective view of the wire tensioning device according to the present invention as seen from the other side. FIG. 3 is an exploded perspective view of the tensioning unit. FIG. 4 is a side view of the tensioning unit. FIG. 5 is a side view of the tensioning unit in a state where the rotation shaft has moved in the tensioning direction of the linear member. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. FIG. 8 is a cross-sectional view of the main body and the rotary shaft of the wire tensioning device. FIG. 9 is a diagram showing the locked member. FIG. 10 is a side view of the locking member. FIG. 11 is a perspective view showing an example of how the wire tensioning device is used. FIG. 12 is a side view showing a modified example of the through hole. FIG. 13 is a side view showing a modified example of the locked member. FIG. 14 is a side view showing a modified example in which the locked member is movable.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a wire tensioning device according to the present invention will be described in detail below with reference to FIGS.
The wire tensioning device 1 shown in Figure 1 is attached to a support 2 indicated by a two-dot chain line in Figure 1, and is used to pull a linear member 3 toward the support 2. In this embodiment, the support 2 corresponds to the "support body" referred to in the present invention. The support 2 is formed from a pipe or a round bar with a circular cross section.

The linear member 3 shown in Figure 1 is formed from a wire, rope, or chain. One end of this linear member 3 is connected to a support post 2 via a wire tensioning device 1, and the other end is connected to another support post or structure (not shown), and is installed between the support post 2 and the other support post or structure. These support posts 2 and linear members 3 can be used to partition a home garden 4, for example, as shown in Figure 11. The home garden 4 shown in Figure 11 is partitioned from other surrounding home gardens (not shown) by four support posts 2 and four linear members 3. One end of the linear member 3 shown in Figure 11 is connected to the support post 2 via the wire tensioning device 1 of this embodiment, and the other end is connected to another support post 2 via a clamp 5 for hanging the linear member.

As shown in Figures 1 and 2, the wire tensioning device 1 is composed of a clamp 11 attached to a support pole 2 and a wire tensioning unit 12 attached to the clamp 11. In this embodiment, when indicating directions in describing each component of the wire tensioning device 1, the direction in which the support pole 2 extends is referred to as the up-down direction, the direction in which the linear member 3 is pulled (diagonally upward and to the right in Figure 1) is referred to as the tensioning direction, and the direction in which the linear member 3 loosens (diagonally downward and to the left in Figure 1) is referred to as the relaxation direction. Therefore, the "tensioning direction" and "relaxing direction" shown in Figure 1 etc. refer to the tensioning direction and relaxation direction of the linear member 3.

(Clamp explanation)
The clamp 11 is equivalent to a single clamp used to assemble temporary scaffolding (not shown), and is configured to clamp the support 2 between a fixed arm 13 and a movable arm 14. The fixed arm 13 is formed in a V-shape in plan view that opens toward the support 2, and supports the tensioning unit 12. One end of the fixed arm 13 is swingably connected to one end of the movable arm 14 by a first support pin 15, and the base of a fastening bolt 16 is swingably connected to the other end of the fixed arm 13 by a second support pin 17.

The movable arm 14 is formed in an arc shape in a plan view so that it can be placed on the outer peripheral surface of the support 2. The other end of the movable arm 14 is provided with a pressing portion 19 having a notch 18 (see Figure 2) into which the tip of the fastening bolt 16 can be inserted and removed. With the tip of the fastening bolt 16 inserted into the notch 18, a nut 20 is screwed onto the fastening bolt 16 and tightened, causing the pressing portion 19 to be pressed toward the fixed arm 13 by the nut 20. With the fixed arm 13 and movable arm 14 sandwiching the support 2, the pressing portion 19 is pressed toward the fixed arm 13 by the nut 20, causing the support 2 to be sandwiched between the fixed arm 13 and movable arm 14, and the clamp 11 to be fixed to the support 2.

(Explanation of the wire tensioning unit)
As shown in Figures 1 and 2, the tensioning unit 12 comprises a main body 21 attached to the support 2 via a clamp 11, a rotating shaft 22 to which the end of the linear member 3 is connected and which winds and unwinds the linear member 3, and a rotation stopping means 23 provided on one end of the main body 21 and the rotating shaft 22.
3, the main body 21 is formed with a U-shaped cross section by a first support plate 24 and a second support plate 25 that are parallel to each other, and a connecting plate 26 that connects one end of the first and second support plates 24, 25. The main body 21 in this embodiment is formed by bending a steel plate into a U-shaped cross section. In this embodiment, the first support plate 24 and the second support plate 25 correspond to the "pair of side wall portions" of the present invention.

1 and 2, a rotating shaft 22 is disposed between the first support plate 24 and the second support plate 25 so as to be rotatable in both directions to wind and unwind the linear member 3. A winding space 27 is formed between the first support plate 24 and the second support plate 25 to accommodate the linear member 3 wound around the rotating shaft 22.
The connecting plate 26 is placed on the fixed arm 13 of the clamp 11 and is fixed to the fixed arm 13 by a fixing bolt 28 that passes through the fixed arm 13 and the connecting plate 26 and a nut 29 that is screwed onto the fixing bolt 28. The connecting plate 26 in this embodiment is fixed to the fixed arm 13 while being positioned so that the first support plate 24 and the second support plate 25 are aligned horizontally.

As shown in FIG. 3, a first through hole 31 is drilled in the first support plate 24, and a second through hole 32 is drilled in the second support plate 25. The opening shapes of these first through hole 31 and second through hole 32 are circular. The first small diameter portion 22a, which forms one end of the rotating shaft 22, is inserted into the first through hole 31. The second small diameter portion 22b, which forms the other end of the rotating shaft 22, is inserted into the second through hole 32. The diameter d1 of the first through hole 31 (see FIG. 8) is larger than the diameter d2 of the second through hole 32.

(Explanation of the locked member)
A locked member 33 constituting part of the rotation stopping means 23, which will be described later, protrudes from one end of the main body 21 on the outer surface 24a of the first support plate 24 (see FIG. 1), i.e., the side surface of the first support plate 24 opposite the second support plate 25. The locked member 33 in this embodiment is formed of a plate member fixed to the outer surface 24a of the first support plate 24, and has a window hole 34 that opens in a predetermined shape. The locked member 33 can be made of the same metal material as the main body 21, for example, and can be fixed to the first support plate 24 by welding.

(Explanation of window holes)
9A and 9B, the window hole 34 of the locked member 33 is formed so as to penetrate the locked member 33 made of a plate member in the thickness direction. As shown in Figs. 9A and 9B, the window hole 34 is formed by a circular portion 35 which is a substantially circular hole with a diameter larger than that of the first through hole 31 of the first support plate 24, and a locked portion 36 which is formed by partially bulging out in the relaxation direction of the linear member 3 from a portion of the circular portion 35 which becomes the tip end of the linear member 3 in the relaxation direction (the left end in Figs. 9A and 9B). Fig. 9A is a perspective view showing one end of the main body 21, and Fig. 9B is a side view of the main portion showing the opening shapes of the window hole 34 and the first through hole 31.

As shown in Figure 9 (B), the circular portion 35 is located at approximately the same height as the first through hole 31 in the vertical direction, and is formed so that its center is positioned more biased in the tension direction of the linear member 3 than the first through hole 31.
The tip portion of the circular portion 35 in the relaxation direction of the linear member 3 is formed so that the upper half 35b is positioned more biased in the relaxation direction of the linear member 3 shown in Figure 1 etc. than the lower half 35a, and has a flat surface 37 that forms the boundary between the lower half 35a and the upper half 35b. The flat surface 37 is formed approximately horizontally so as to extend in the relaxation direction with one end of the lower half 35a of the circular portion 35 (the tip in the relaxation direction of the linear member 3, which is the left end in the figure) as its base end. An engaged portion 36 is formed between this flat surface 37 and the upper half 35b of the circular portion 35.

(Description of rotation axis)
As shown in Fig. 3, the rotating shaft 22 is formed in a cylindrical shape and has a first small-diameter portion 22a and a second small-diameter portion 22b located at both ends in the axial direction, and a large-diameter portion 22c including the center in the axial direction. Two through holes 41 are drilled in the large-diameter portion 22c in a direction perpendicular to the axial direction to allow the linear member 3 to be passed therethrough for attachment. The outer diameter D1 of the large-diameter portion 22c (see Fig. 8) is smaller than the diameter d1 of the first through hole 31 and larger than the diameter d2 of the second through hole 32.
The first small diameter portion 22 a and the second small diameter portion 22 b are formed to have the same outer diameter and to protrude a predetermined length in the axial direction from the large diameter portion 22 c. The outer diameter D2 of the first small diameter portion 22 a and the second small diameter portion 22 b is smaller than the diameter d2 of the second through hole 32.

As shown in Figure 6, the rotating shaft 22 is assembled to the main body 21 with the large diameter portion 22c positioned between the first support plate 24 and the second support plate 25, i.e., with the first small diameter portion 22a inserted through the first through hole 31 of the first support plate 24 and the second small diameter portion 22b inserted through the second through hole 32 of the second support plate 25. In this assembled state, a gap S1 is formed between the first small diameter portion 22a and the inner surface of the first through hole 31, allowing the rotating shaft 22 to move freely relative to the main body 21. Furthermore, a gap S2 is formed between the second small diameter portion 22b and the inner surface of the second through hole 32, allowing the rotating shaft 22 to move freely relative to the main body 21. In other words, the rotating shaft 22 can move relative to the main body 21 within these gaps S1 and S2, and the rotating shaft 22 can move freely relative to the main body 21 in the tensioning and relaxation directions of the linear member 3.

The gap S1 is larger than the gap S2. This means that one end (first small diameter portion 22a) of the rotating shaft 22, on which part of the rotation stopping means 23 described later is provided, can move more freely relative to the main body 21 than the other end.
Of the first small diameter portion 22a and the second small diameter portion 22b of the rotating shaft 22, the first small diameter portion 22a, which constitutes "one end of the rotating shaft" according to the present invention, has a first protruding portion 42 that protrudes outward from the main body 21 beyond the first support plate 24 when the rotating shaft 22 is assembled to the main body 21, as shown in Figure 6. This first protruding portion 42 is provided with a locking member 43 that constitutes the rotation stopping means 23 in cooperation with the above-mentioned locked member 33. The locking member 43 will be described later.

6, the second small diameter portion 22b has a second protruding portion 44 that protrudes from the second support plate 25 to the outside of the main body 21 when the rotary shaft 22 is incorporated into the main body 21. A tool engaging member 45 that detachably engages with a tool (not shown) is welded to this second protruding portion 44. In this embodiment, the tool engaging member 45 corresponds to the "engaging portion" of the present invention.
The tool rotates the rotating shaft 22 forward and backward to wind the linear member 3 onto the rotating shaft 22 and unwind it from the rotating shaft 22. The tool engagement member 45 is formed in a shape resembling a hexagonal nut, as shown in Figure 2. The wire tensioning device 1 according to this embodiment is configured so that, assuming the tool engagement member 45 is a nut, the linear member 3 is wound onto the rotating shaft 22 by rotating the rotating shaft 22 in a direction that loosens the nut. Hereinafter, the rotation direction of the rotating shaft 22 when the linear member 3 is wound onto the rotating shaft 22 will be simply referred to as the winding direction, and the rotation direction of the rotating shaft 22 when the linear member 3 is unwound from the rotating shaft 22 will be simply referred to as the unwinding direction.

When the linear member 3 is wound around the rotating shaft 22, the linear member 3 becomes taut, and the tension of the linear member 3 acts on the rotating shaft 22. Because the rotating shaft 22 is free to move relative to the main body 21, the rotating shaft 22 moves relative to the main body 21 in a direction away from the support 2 (the relaxation direction of the linear member 3 shown in Figure 1, etc.).

(Description of rotation stopping means)
The rotation stopping means 23 is composed of the above-mentioned locked member 33 and a locking member 43 provided on the rotating shaft 22, and stops the rotation of the rotating shaft 22 by locking the locked member 33 with the locking member 43.
3, the locking member 43 is configured by a ratchet gear having a through hole 43a into which the first small diameter portion 22a fits, and is welded to the first small diameter portion 22a so as to be housed in the window hole 34 of the locked member 33 when the rotating shaft 22 is assembled to the main body 21. The locking member 43 according to this embodiment has a plurality of claw pieces 51 that protrude outward in the radial direction of the rotating shaft 22 from the first protruding portion 42 of the rotating shaft 22 (first small diameter portion 22a).

10, these claw pieces 51 are formed integrally with the outer circumferential portion of the annular portion 43b that forms the through hole 43a of the locking member 43. More specifically, the claw pieces 51 are formed at positions that divide the annular portion 43b into four equal parts in the circumferential direction so as to protrude radially outward from the annular portion 43b.
When viewed from the axial direction of the rotary shaft 22, the claw 51 in this embodiment is formed in a mountain-shaped cross section sandwiched between a flat surface 52 extending linearly radially outward from the annular portion 43b and a convex surface 53 extending from the tip of the flat surface 52 to the base end of the flat surface 52 of the adjacent claw 51. The direction in which the convex surface 53 extends from the tip of the flat surface 52 is the direction in which the tip of the flat surface 52 advances when the rotary shaft 22 rotates in the direction in which the linear member 3 is wound up (clockwise in FIG. 10 ).

When the rotating shaft 22 is assembled to the main body 21, the locking member 43 is accommodated in the window hole 34 of the locked member 33 as shown in Figure 1, and moves within the window hole 34 following the rotating shaft 22 which moves freely relative to the main body 21.
When the linear member 3 is tensioned and the rotating shaft 22 moves relative to the main body 21 in the direction in which the linear member 3 is relaxed, the claw 51 engages with the locked portion 36 of the locked member 33, as shown in Figures 4(A) and 6. Figure 4(A) is a side view of the tensioning unit 12 showing the state in which the locking member 43 is engaged with the locked member 33. At this time, the locked member 33 stops the rotating shaft 22 from rotating in the payout direction (counterclockwise in Figure 4(A)). That is, in this state, the flat surface 52 of the claw 51 overlaps with the flat surface 37 of the locked portion 36, preventing the rotating shaft 22 from rotating further in the payout direction.

Furthermore, when the linear member 3 is relaxed, for example, and the rotating shaft 22 moves relative to the main body 21 in the direction of tensioning the linear member 3 as shown in Figures 5 and 7, the claw piece 51 disengages from the interlocking portion 36. In this state, the rotating shaft 22 is free to rotate relative to the main body 21. In other words, the interlocking member 43 is interlocked with the interlocking member 33 when the linear member 3 is tensioned, and can be disengaged from the interlocking member 33 when the linear member 3 is relaxed.

(Explanation of the operation of the wire tensioning device)
To tension the linear member 3 using the wire tensioning device 1 according to this embodiment, the clamp 11 is fixed to the support 2, one end of the linear member 3 is connected to the rotating shaft 22, and the rotating shaft 22 is rotated in the winding direction. The rotating shaft 22 is rotated by engaging a tool such as a ratchet wrench with the tool engaging member 45. As the rotating shaft 22 rotates in the winding direction to wind up the linear member 3, the tension of the linear member 3 causes the rotating shaft 22 to move away from the support 2 relative to the main body 21 (in the direction in which the linear member 3 relaxes).

When the rotating shaft 22 is rotated in the winding direction in this state, the claw 51 alternates between engaging with the interlocking portion 36 as shown in Figure 4(A) and sliding toward the interlocking portion 36 as shown in Figure 4(B), with the convex curved surface 53 of the claw 51 contacting the inner surface of the window hole 34 located near the interlocking portion 36. Figure 4(B) is a side view of the tensioning unit 12 showing the interlocking member 43 rotating while sliding against the interlocking portion 33. When the force applying to the rotation of the rotating shaft 22 is reduced and the rotating shaft 22 is stopped with the linear member 3 sufficiently tensioned, the claw 51 of the interlocking member 43 interlocks with the interlocking portion 36 of the interlocking portion 33 as shown in Figure 4(A), thereby restricting the rotating shaft 22 from rotating in a direction that would loosen the linear member 3. By engaging the locking member 43 with the locked member 33 in this way, the linear member 3 can be kept continuously stretched, i.e., in a taut state.

To loosen the linear member 3, the rotating shaft 22 is moved toward the support 2 against the tension of the linear member 3. This operation can be performed, for example, by an operator manually pushing the large-diameter portion 22c of the rotating shaft 22 toward the support 2. This operation moves the rotating shaft 22 toward the support 2 relative to the main body 21 until it contacts or approaches the inner surface of the first through-hole 31 or the second through-hole 32, as shown in Figures 5 and 7. By moving the rotating shaft 22 in this manner, the claw 51 disengages from the engaging portion 36, i.e., the engagement of the claw 51 with the engaging portion 36 is released. The tension of the linear member 3 causes the rotating shaft 22 to rotate in the unwinding direction, which unwinds and loosens the linear member 3 from the rotating shaft 22. The linear member 3 can also be re-tensioned by rotating the rotating shaft 22 in the winding direction.

In the wire tensioning device 1 configured in this manner, the only movable part attached to the main body 21 is the rotating shaft 22, so the number of movable parts is reduced compared to conventional wire tensioning devices, resulting in a simpler structure. Also, when winding up the linear member 3, the claw piece 51 slides along the inner surface of the window hole 34, so the resistance during winding is smaller than in conventional wire tensioning devices.
Therefore, according to this embodiment, it is possible to provide a wire tensioning device that has a simple structure, can keep manufacturing costs low, and has low resistance when winding the wire.

In the wire tensioning device 1 according to this embodiment, gaps S1 and S2 are formed between the inner surfaces of the first and second through-holes 31 and 32 and the rotating shaft 22, allowing the rotating shaft 22 to move freely relative to the main body 21. Therefore, a simple structure can be used to allow the rotating shaft 22 to move freely relative to the main body 21.

The locking member 43 in this embodiment has multiple claws 51 that protrude radially outward from the first protrusion 42 of the rotating shaft 22. The locked member 33 protrudes from the outer surface 24a of the first support plate 24 and is configured to engage with the claws 51 when the linear member 3 is under tension. As a result, the rotation stopping means 23, which includes the locking member 43 and the locked member 33, is located outside the main body 21, preventing interference between the locking member 43, which rotates during winding or unwinding, and the linear member 3.

In this embodiment, the opening shapes of the first through hole 31 and the second through hole 32 are circular. The diameter d1 of the first through hole 31 is larger than the diameter d2 of the second through hole 32. This allows one end (first small-diameter portion 22a) of the rotating shaft 22 having the locking member 43 to move more freely relative to the main body 21 than the other end, thereby allowing the locking member 43 to move a larger distance when approaching or moving away from the locked portion 36 of the locked member 33. Furthermore, because the opening shapes of the first and second through holes 31 and 32 are circular, the locking member 43 has a high degree of freedom in the direction of movement when approaching or moving away from the locked portion 36 of the locked member 33.
Therefore, it is possible to clearly distinguish between a state in which the locking member 43 is locked to the locked portion 36 of the locked member 33 and a state in which this lock is released, and it is therefore possible to easily prevent the locking member 43 from accidentally being locked to the locked portion 36 of the locked member 33 when the linear member 3 is unwound.

In this embodiment, a tool engagement member 45 is provided on the end (second small diameter portion 22b) of the rotating shaft 22 opposite the locking member 43, with which a tool for rotating the rotating shaft 22 can be detachably engaged. This makes it easy to use a tool to rotate the rotating shaft 22 in both the winding direction and the unwinding direction.

The locked member 33 in this embodiment is composed of a plate member fixed to the outer surface 24a of the first support plate 24, and has a window hole 34 capable of accommodating the locking member 43. The inner surface of the window hole 34 is formed with a locked portion 36 that engages with the claw piece 51 when the linear member 3 is tensioned. As a result, the periphery of the locking member 43 is surrounded by the locked member 33, and the claw piece 51 of the locking member 43 can be protected by the locked member 33.

In this embodiment, the main body 21 of the wire tensioning device 1 is connected to a clamp 11, which clamps the support pole 2, thereby attaching the main body 21 to the support pole 2. This makes it easy to attach the main body 21 to the support pole 2.

(Modification of the first through hole)
The first through-hole can be formed as shown in Fig. 12. In Fig. 12, the same or equivalent members as those described with reference to Figs. 1 to 11 are designated by the same reference numerals, and detailed description thereof will be omitted where appropriate.
12 is formed to have an oval opening shape. More specifically, the first through-hole 61 is formed to extend in the tensioning direction and the relaxation direction of the linear member 3 with an opening width that allows the first small diameter portion 22a of the rotating shaft 22 to be inserted therethrough in a loose fit.

By forming the first through hole 61 in this elliptical shape, the movement direction of the first small diameter portion 22a can be determined to be the tensioning and relaxation direction of the linear member 3, preventing unnecessary vertical movement of the locking member 43 relative to the locked member 33. This stabilizes the behavior of the locking member 43 when it is locked to the locked member 33 or when it is released from the locked member 33, reducing noise generated when the claw 51 of the locking member 43 hits the locked member 33. Although not shown in Figure 12, the second through hole may also be elliptical like the first through hole 61, or may be circular like the second through hole 32 when the embodiment shown in Figures 1 to 11 is adopted.

(Modification of the locked member)
The locked member can also be configured as shown in Figures 13 and 14(A) and (B). Figure 14(A) is a side view of the tensioning unit 12 showing the locking member 43 locked to the locked member 63, and Figure 14(B) is a side view of the tensioning unit 12 showing the locking member 43 released from its locked state. In Figures 13 and 14(A) and (B), components that are the same as or equivalent to those described in Figures 1 to 11 are designated by the same reference numerals, and detailed descriptions will be omitted where appropriate. Also, in Figures 13 and 14(A) and (B), the rotating shaft 22 is free to move relative to the main body 21 in the direction of tensioning and relaxing the linear member 3.

The interlocking member 62 shown in Figure 13 is composed of a protrusion protruding from the outer surface 24a of the first support plate 24. This interlocking member 62 is formed from a cylindrical steel material and is welded to the first support plate 24 with its axis perpendicular to the outer surface 24a of the first support plate 24. The interlocking member 62 is also formed in a position that engages with the claw piece 51 when the linear member 3 is tensioned.

The engaging member 62 constructed using this protrusion is easy to manufacture and can be easily attached to the first support plate 24, further reducing the manufacturing costs of the wire tensioning device 1 compared to when the engaging member 33 shown in Figures 1 to 12 is used.

14(A) and 14(B) is formed from a metal plate member and is movably supported on the outer surface 24a of the first support plate 24 by a support structure 64 (described later). The direction in which the locked member 63 moves is the relaxation direction and tension direction of the linear member 3. The locked member 63 has a window hole 34 formed therein, as in the embodiment shown in FIGS. 1 to 11.
The support structure 64 for supporting the interlocked member 63 so that it can move freely on the first support plate 24 is a structure in which the upper and lower ends of the interlocked member 33 are held so that they can move freely by rail members 65 with an L-shaped cross section.

The rail member 65 in this embodiment consists of an upper rail 65a extending in the relaxation and tension directions of the linear member 3 near the upper end of the locked member 33, a lower rail 65b extending in the relaxation and tension directions of the linear member 3 near the lower end of the locked member 63, and a vertical rail 65c connecting one end of the upper rail 65a and one end of the lower rail 65b in the relaxation direction of the linear member 3, and is formed in a U-shape when viewed from the axial direction of the rotating shaft 22. This rail member 65 is welded to the first support plate 24.

The upper rail 65a of the rail member 65 is formed to fit along the upper end surface 63a and outer surface 63b of the interlocking member 63, and restricts the movement of the upper end of the interlocking member 63 upward and outward (away from the first support plate 24).
The lower rail 65b of the rail member 65 is formed to fit along the lower end surface 63c and outer surface 63b of the locked member 33, and restricts the lower end of the locked member 33 from moving downward and outward.

Stoppers 66 are provided at the leading ends of the upper rail 65a and lower rail 65b in the tensioning direction of the linear member 3 to determine the limit position of the locked member 63 when it moves in the tensioning direction of the linear member 3. These stoppers 66 are configured to face the leading end 63d of the locked member 63 in the tensioning direction of the linear member 3. As shown in Figure 14(A), the position at which the stopper 66 is provided in the movement direction of the locked member 63 is the position at which the locking member 43 is locked to the locked portion 36 of the locked member 63, with the leading end 63d abutting against the stopper 66. The locking member 43 shown in Figure 14(A) is drawn in a position where the linear member 3 is tensioned and the rotation shaft 22 has moved in the relaxation direction of the linear member 3. Hereinafter, the position of the locked member 33 when the locking member 43 is locked to the locked member 33 in this manner will be referred to simply as the "locking position."

From this locked position, the locked member 63 is guided by the rail member 65 and moves in the direction of loosening of the linear member 3, thereby releasing the locked state of the locking member 43 as shown in Figure 14 (B). Hereinafter, the position of the locked member 63 when the locked state of the locking member 43 is released in this way will be referred to simply as the "unlocked position." In other words, the locked member 63 can move relative to the main body 21 between the locked position where the locking member 43 is locked by the tension of the linear member 3, and the unlocked position where the locked state is released.

The vertical rail 65c of the rail member 65 is positioned a predetermined distance away from the locked member 63 in the relaxation direction of the linear member 3. As shown in Figure 14 (B), the vertical rail is positioned so that an elastically biasing member 67 can be placed between the locked member 63, which is positioned in the unlocked position described above, and the vertical rail 65c. In this embodiment, the elastically biasing member 67 is composed of a leaf spring formed in an arc shape overall, and is attached in an elastically deformed state between the locked member 63 and the vertical rail 65c, with both ends held by the vertical rail 65c and the center contacting the locked member 63. This elastically biasing member 67 biases the locked member 63 toward the locked position described above.

In this tensioning unit 12 equipped with a locking member 63 that can move between a locked position and an unlocked position, when the linear member 3 is tensioned and the locking member 43 is locked to the locking member 63 (the state shown in Figure 14(A)), pushing the locking member 63 in the direction of relaxation of the linear member 3 against the spring force of the elastic biasing member 67 releases the locking state of the locking member 43 as shown in Figure 14(B). Therefore, according to this embodiment, the tensioned linear member 3 can be easily released and unwound simply by moving the locking member 63 relative to the main body 21, resulting in a tensioning device with high operability. Furthermore, by setting the locking member 63 to the state shown in Figure 14(B), the rotating shaft 22 can be rotated forward and backward to wind and unwind the linear member 3.

In each of the above-described embodiments, an example of the wire tensioning device 1 attached to a support pole 2 has been shown, but the support body to which the wire tensioning device 1 is attached and which supports the wire tensioning device 1 is not limited to a support pole 2. The support body to which the wire tensioning device 1 is attached may be, for example, a pipe extending vertically on a building, or a columnar body extending horizontally.

The present invention can be used, for example, as a wire tensioning device to tension the wire that marks the boundaries of a home vegetable garden.

1...wire tensioning device, 2...support pole, 3...linear member, 11...clamp, 21...main body, 22...rotating shaft, 22a...first small diameter portion, 22b...second small diameter portion, 23...rotation stopping means, 24...first support plate serving as side wall, 24a...outer surface, 25...second support plate serving as side wall, 27...winding space, 31, 61...first through hole, 32...second through hole, 33, 62, 63...engaged member, 34...window hole, 36...engaged portion, 42...first protrusion, 43...engaging member, 45...tool engaging member, 51...claw, 67...elastic biasing member, S1, S2...gaps.

Claims (7)

a body attached to a support;
a rotating shaft to which an end of a linear member to be laid is connected and which is disposed on the main body so as to be rotatable forward and backward to wind and unwind the linear member;
a rotation stopping means for stopping the rotation of the rotary shaft,
In a wire tensioning device, the rotation stopping means has a locking member provided on the rotating shaft and a locked member provided on the main body, which stops the rotation of the rotating shaft when the locking member is locked,
the rotation shaft is movable relative to the main body in a tensioning direction and a relaxation direction of the linear member,
the locking member is locked to the locked member when the linear member is tensioned, and is capable of being released from the locked member when the linear member is relaxed,
The body includes:
a pair of side walls each having a through hole through which both ends of the rotary shaft are inserted;
one end of the rotating shaft has a protruding portion that protrudes outward from one of the pair of side wall portions of the main body,
the locking member has a plurality of claw pieces that protrude outward in a radial direction of the rotary shaft from the protruding portion of the rotary shaft,
the engagement member is formed by a plate member fixed to an outer surface of the one side wall portion,
the plate member has a window hole capable of accommodating the locking member,
A wire tensioning device characterized in that an engaging portion that engages with the claw piece when the linear member is tensioned is formed on the inner surface of the window hole . a body attached to a support;
a rotating shaft to which an end of a linear member to be laid is connected and which is disposed on the main body so as to be rotatable forward and backward to wind and unwind the linear member;
a rotation stopping means for stopping the rotation of the rotary shaft,
the main body has a pair of side walls having through holes through which both ends of the rotary shaft are inserted,
one end of the rotating shaft has a protruding portion that protrudes outward from one of the pair of side wall portions of the main body,
The rotation stopping means is
a locking member provided on the rotating shaft;
a plate member supported on the outer surface of one of the side walls, the plate member being movable relative to the main body between a locking position where the locking member is locked by tensioning the linear member and a non-locking position where the locked state of the locking member is released, and the locking member stopping the rotation of the rotating shaft by being locked by the locking member;
an elastic biasing member that biases the locking member toward the locking position;
and
the rotation shaft is movable relative to the main body in a tensioning direction and a relaxation direction of the linear member,
the locking member has a plurality of claw pieces that protrude from the protruding portion of the rotating shaft to the outside in the radial direction of the rotating shaft, and is locked to the locked member when the linear member is tensioned, and is capable of being released from the locked member when the linear member is relaxed,
the plate member has a window hole capable of accommodating the locking member,
A wire tensioning device characterized in that an engaging portion that engages with the claw piece when the linear member is tensioned is formed on the inner surface of the window hole . The wire tensioning device according to claim 1 or 2 ,
The body includes :
a winding space formed between the side wall portions and configured to accommodate the linear member wound around the rotary shaft;
A wire tensioning device characterized in that a gap is formed between the inner surface of the through hole and the rotating shaft, allowing the rotating shaft to move freely relative to the main body. The wire tensioning device according to claim 1 or 2 ,
A wire tensioning device characterized in that, of the through holes formed in the pair of side wall portions, at least the through hole through which the end of the rotating shaft on the side where the locking member is provided is inserted is circular. The wire tensioning device according to claim 1 or 2 ,
A wire tensioning device characterized in that of the through holes formed in the pair of side wall portions, at least the through hole through which the end of the rotating shaft on the side where the locking member is provided is inserted is formed in an elliptical shape extending in the tensioning direction and relaxation direction of the linear member with an opening width that allows the end of the rotating shaft to be inserted in a loose fit state. The wire tensioning device according to any one of claims 1 to 5 ,
A wire tensioning device characterized in that the other end of the rotating shaft is provided with an engaging portion with which a tool for turning the rotating shaft can be detachably engaged. The wire tensioning device according to any one of claims 1 to 6 ,
a clamp connected to the body;
the support is a column;
A wire tensioning device characterized in that the main body is attached to the support pole by the clamp clamping the support pole.