JPH0412151B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides tension-holding for tensioning ropes for athletic nets used in volleyball, tennis, etc., fixed ropes for truck loads, clothesline ropes, etc.
This invention relates to improvements in tension holding devices such as ropes for tensioning.

(Prior Art) When tensioning a rope, for example, when tensioning a tension rope for an athletic net such as a tennis ball, a rope tension holding device is used to maintain the tension rope at an appropriate tension. is used.

Conventionally, rope tension holding devices have generally used devices in which a handle rotates a winding drum having a gear that meshes with a ratchet. In the rope tension holding device, since the means for locking the rotation of the winding drum utilizes the meshing of a ratchet and a gear, the tension of the rope is adjusted in stages and fine adjustment is difficult. When loosening the rope, the rope must be tensed once, which is difficult to operate, and the weight and tension of the rope causes the handle to reverse at high speed, which is dangerous. If the gear is worn out, it may not mesh properly with the ratchet and come off accidentally, making it difficult to keep the rope taut. The problem was that it was not.

In order to solve the above-mentioned problems, the patent applicant has
A coil spring is disposed between the take-up drum and a fixed member, and the tension of a rope or the like is such that the rotation of the take-up drum can be locked by the frictional force generated between the take-up drum and the coil spring. A holding device has already been developed (see Japanese Patent Application No. 58-213825).

An example of the tension holding device such as the rope will be explained based on FIGS. 11 to 16. In addition, FIG. 11 is a plan view of the tension holding device, FIG. 12 and FIG.
The figures are sectional views taken along lines -' and -' in Fig. 11, respectively. Fig. 14 is a right side view of Fig. 11, and Fig. 15 is a sectional view taken along line -' in Fig. 14. 16 is an enlarged view of the main part of FIG. 13.

The rope tension holding device is shown in FIGS. 11 and 1.
As shown in Fig. 2, a bracket 21 having a U-shaped cross section is fixed by welding or screwing to the side surface of a support post P installed upright on a court, etc., a drive shaft 28 rotatably supported by the bracket 21, and a drive shaft 28 rotatably supported by the bracket 21. A fixed tube 26 is fitted over the drive shaft 28 and has one end fixed to the bracket 21, and a fixed tube 26 is in contact with the unfixed end of the fixed tube 26, and is fitted around the drive shaft 28 and rotatably supported. a winding drum 22 which is inserted into the fixed tube 26 and the rotating tube 22b and rotatably supported, and in which a pin 29 for hooking the rope R is implanted, and the fixed tube 26. and a coil spring 27 inserted so as to be in pressure contact with the rotation tube 22b.

As shown in FIGS. 12 and 13, the drive shaft 28 is provided with an axial notch 28a having a first ear 28b and a second ear 28c.
As shown in FIG. 4, one end has a rectangular cross-section to engage a handle (not shown). The other end of the pin 29 for hanging the rope R passes through the rotation tube 22b and is connected to the notch 28a of the drive shaft 28.
is inserted into. The coil spring 27 has an outer diameter larger than the inner diameter of the fixed tube 26 and the rotating tube 22b, and is inserted into the inner circumferential surfaces of the fixed tube 26 and the rotating tube 22b in pressure contact. The coil spring 27 is the twelfth
13 and 15, the first end 27a is engaged with a pin 29 for hooking the rope R, and the second end 27b is engaged with the notch 28a of the drive shaft 28.
is inserted into. Furthermore, the coil spring 27 is a left-handed spring, and as shown in FIG.
8 rotates in the direction of arrow A, the first ear portion 28b
presses pin 29, thereby causing first end 27
Since a is pressed, the outer diameter of the coil spring 27 is reduced. When the drive shaft 28 rotates in the direction of arrow B, the second ear portion 28c presses the second end portion 27b, so that the outer diameter of the coil spring 27 is reduced.

Since the tension holding device for the rope, etc. is constructed as described above, each operation of tensioning, holding, and relaxing the rope is performed as follows.

When tensioning and holding the rope, connect rope R to pin 2.
9 and engages a handle (not shown) with one end of the drive shaft. When the drive shaft 28 is rotated in the direction of arrow A in FIG. 16, the first ear 28b of the notch 28a comes into contact with the pin 29, and the first end 27a of the coil spring 27 is pressed. When the first end 27a of the coil spring 27 is pressed, the coil spring 27
The outer diameter of the coil spring 27 is reduced, and the pressing force between the outer diameter portion of the coil spring 27 and the inner peripheral surfaces of the fixed tube 26 and the rotating tube 22b is weakened. That is, the frictional force between the outer diameter portion of the coil spring 27 and the inner circumferential surfaces of the fixed tube 26 and the rotating tube 22b is weakened, and the rotating tube 22b is in a state where it can rotate. Furthermore, since the rotational force is transmitted to the rotational tube 22b from the drive shaft 28 via the pin 29, the rotational tube 22b begins to rotate at the same time as the rotational tube 22b becomes rotatable as described above. At the same time, the winding drum 22 is rotated via the pin 29, winds up the rope R hooked on the pin 29, and tensions it.

When the rope R is wound up and reaches a predetermined tension state, the operating force of the handle is removed and the rotation of the drive shaft 28 is stopped. When the drive shaft 28 stops, the first end 27a of the coil spring 27 is connected to the first end of the drive shaft 28.
The pressing force from the ear portion 28b is released and the outer diameter is expanded. That is, the pressing force between the outer diameter portion of the coil spring 27 and the inner circumferential surfaces of the fixed tube 26 and the rotating tube 22b, in other words, the frictional force is increased. Also, the rotation tube 22b
In this case, depending on the weight and tension of the rope R,
A force in the direction of unwinding acts through the winding drum 22 and the pin 29. However, when the rotation tube 22b tries to rotate in the direction to unwind the rope R, the first end 27a of the coil spring 27 is moved in a direction to expand the outer diameter of the coil spring 27, and the outer diameter of the coil spring 27 is The frictional force generated between the inner peripheral surfaces of the fixed tube 26 and the rotating tube 22b is increased. Therefore, the rotation tube 22b is connected to the coil spring 2
It is now fixed to the fixed tube 26 via 7,
Its rotation is locked. Also, winding drum 2
2, since the pin 29 passes through the rotation tube 22b, the rotation is locked via the pin 29, and the rope R is held under a predetermined tension.

When loosening the rope R, when the drive shaft 28 is rotated in the direction of the arrow in FIG.
The second ear portion 28c of the coil spring 27a presses the second end portion 27b of the coil spring 27. When the second end portion 27b is pressed, the outer diameter of the coil spring 27 is reduced, and the pressing force between the outer diameter portion of the coil spring 27 and the inner peripheral surfaces of the fixed tube 26 and the rotating tube 22b is weakened. That is, the frictional force between the outer diameter portion of the coil spring 27 and the inner peripheral surfaces of the fixed tube 26 and the rotating tube 22b is weakened. Therefore, the rotation tube 22b is in a state where it can rotate. On the other hand, the winding drum 22 is connected to the rotating tube 22b via the pin 29, so it is in a state where it can rotate, and is rotated in the direction of the arrow B by the weight and tension of the rope, and the rope R is relaxed. be done.

Note that the winding drum 22 and the rotating tube 22b are
When the rope rotates in the direction of arrow B due to the weight, tension, etc. of the rope, if the rotation speed is greater than the rotation speed of the drive shaft 28, the friction generated between the rotation tube 22b and the coil spring 27. The force moves the coil spring 27 in a direction that expands its outer diameter.
Further, the first end 27a of the coil spring 27 is connected to the pin 2.
9, it is moved in the direction of expanding the outer diameter. Therefore, the frictional force between the outer diameter portion of the coil spring 27 and the inner circumferential surfaces of the fixed tube 26 and the rotating tube 22b increases, and the rotating tube 22b becomes fixed to the fixed tube 26. That is, when the drive shaft 28 is rotated in the direction of arrow B by the handle to weaken the frictional force between the coil spring 27, the fixed tube 26, and the rotating tube 22b, the weight and tension of the rope R cause the winding drum to move. 22 rotates in a direction to loosen the rope R. When the rotation of the drive shaft 28 by the handle is stopped, the winding drum 22 due to the weight, tension, etc. of the rope R is stopped.
The rotation of is stopped by the frictional force of the coil spring 27. Furthermore, if the rotational speed of the winding drum 22 and rotating tube 22b due to the weight, tension, etc. of the rope R is higher than the rotational speed of the drive shaft 28, the rotation of the drive shaft 28 by the handle does not need to be stopped; The take-up drum 22 and rotating tube 22b are immediately stopped. Of course, the drive shaft 2 can be controlled by the handle.
8, the rotation will immediately resume. Therefore, the winding drum 22
It does not rotate at high speed due to the weight, tension, etc. of the drive shaft 28, but rotates according to the rotational speed of the drive shaft 28.

As described above, the tension holding device for ropes, etc., developed by the applicant of the present patent is configured to lock the rotation of the take-up drum by using the frictional force of the coil spring. The tension can be adjusted steplessly and finely adjusted. Moreover, the tension state can be maintained reliably. Furthermore, when relaxing the rope, the take-up drum is rotated in the opposite direction by rotating the handle in the opposite direction, and the take-up drum is stopped by stopping the rotation of the handle, and the take-up drum is also rotated in the reverse direction. If the speed becomes faster than the speed according to the rotation operation of the handle, the take-up drum is immediately stopped, so that the handle does not rotate at high speed due to the weight, tension, etc. of the rope. It has advantages that cannot be expected from conventional ones.

However, since the rope tension holding device has a structure in which the winding drum is directly connected to the drive shaft, the stronger the tension on the rope, etc., the greater the operating force of the handle to rotate the winding drum. There is a need to. By making the handle longer, you can increase the operating force of the handle, but
Additional space is required to operate the handle, and it becomes difficult to rotate the handle.

(Object of the Invention) An object of the present invention is to solve the above-mentioned problems of the conventional technology, and to improve the relationship between the winding drum and the drive device, thereby improving the relationship between the winding drum and the drive device. To provide a tension holding device such as a rope that can reduce operating force, reduce the operating force of the handle when starting rotation operation of the handle, and further reduce the operating force of the handle when releasing the lock of a spring clutch mechanism. There is a particular thing.

(Structure of the Invention) In order to achieve the above-mentioned object, the present invention provides a tension holding device for a rope or the like that is equipped with a spring clutch mechanism that locks the rotation of the take-up drum around which the rope or the like is wound. The winding drum can be rotationally driven by separating the drive device that rotationally drives the winding drum and by using a gear train that can double the power as a means for transmitting power from the drive device to the winding drum. This is a tension holding device for a rope or the like, which is characterized by being able to reduce the force required to hold the rope.

That is, the configuration of the present invention includes a winding drum, a drive device, a gear train for transmitting boost power from the drive device to the winding drum, a drive drum of the drive device, and a coil spring attached to the drive drum. This tension holding device for a rope or the like is characterized by comprising a spring clutch mechanism that locks the rotation of the winding drum by the frictional force generated therebetween, and a blanket that supports each of the above-mentioned members.

(Example) The present invention will be described in detail based on the example shown in FIGS. 1 to 10.

1 to 3 are a front view, a left side view, and a right side view of a tension holding device such as a rope according to an embodiment. 4 is a cross-sectional view taken along the line xx' in FIG. 3, and FIGS. 5 and 6 are cross-sectional views taken along the line y-y' and z-z' in FIG. 7 is an enlarged view of the main part A in FIG. 4, and FIG. 8 is an enlarged view of the main part B in FIG.
FIGS. 9 and 10 are a front view and a plan view of an example of the handle used.

The configuration of this embodiment is as follows.

Reference numeral 1 denotes a bracket having a U-shaped cross section and fixed to the side surface of the support P by welding or screwing. 2 is
A winding drum is rotatably supported by a bracket 1 via a bearing 3 and winds up a rope R, etc. to be tensioned, and a large-diameter first gear 2 is integrally attached thereto.
a. It has a pin 4 for hanging the end of the rope R etc. to be tensioned. 5 is a drive drum rotatably supported by the bracket 1 in parallel with the winding drum 2, a second gear 5a having a small diameter attached to mesh with the first gear 2a, and an engagement hole long in the circumferential direction. 5
It has b. Further, as shown in FIGS. 4 and 7, the drive drum 5 has a large diameter first hole 5c and a small diameter second hole 5d formed therein. A fixed cylinder 6 is inserted into the first hole 5c of the drive drum 5, has a protrusion with a rectangular cross section at one end, is fixed to the bracket 1 so as not to rotate, and has a second end of the drive drum 5 at the other end. A hole having the same diameter as the hole 5d is formed. 7 is a coil spring which is attached to the second hole 5d of the driving drum 5 and the hole of the fixed cylinder 6, and whose outer diameter is larger than the respective diameters.
As shown in the figure, it is a right-handed spring and has a hook-shaped first end 7a and a second end 7b. 8, one end is the second hole 5d of the drive drum 5
The other end is a fixed cylinder 6, each of which is a rotatably supported drive shaft, and the second hole 5d of the drive drum 5.
The supported portion has a pin 9 implanted to engage with the engagement hole 5b of the drive drum 5, as shown in FIG. Further, the portion 8a supported by the fixed cylinder 6 is formed with an axial notch 8b having a first ear 8c and a second ear 8d, as shown in FIGS. 4 and 7. 8e is a square hole that engages the handle.

The action of the coil spring 7 will be explained based on FIG. 8.

First end 7a and second end 7b of coil spring 7
are inserted into the cutout portion 8b to engage with the first ear portion 8c and the second ear portion 8d, respectively. When the drive shaft 8 rotates in the direction of arrow A, the first ear portion 8c presses the first end portion 7a, and the outer diameter of the coil spring 7 is reduced. Further, when the drive shaft 8 rotates in the direction of arrow B, the second ear portion 8d presses the second end portion 7b, and the outer diameter of the coil spring 7 is reduced in the same manner as described above. When the outer diameter of the coil spring 7 is reduced, the pressing force between the outer diameter portion of the coil spring 7 and the inner peripheral surfaces of the fixed cylinder 6 and the drive drum 5 is weakened. Furthermore, the frictional force generated by the pressing force is also weakened.
That is, the drive drum 5 changes from a state where it was locked to the fixed cylinder 6 via the coil spring 7 to a state where it can be rotated by the rotational force from the drive shaft 8. Note that since the coil spring 7 is a right-handed spring, when the drive drum 5 moves in the direction of arrow B relative to the outer diameter of the coil spring 7, the force of friction with the drive drum 5 causes Then, the outer diameter is expanded. Conversely, when the drive drum 5 moves in the direction of arrow A, the outer diameter of the coil spring 7 is reduced.

In FIGS. 9 and 10, 10 is a handle, and a protrusion 10 is engaged with a square hole 8e of the drive shaft.
a and an operation section 10b.

This embodiment is constructed as described above, and its operation is as follows.

a Regarding the operation of tensioning the rope In Figures 1 to 4, the square hole 8 of the drive shaft 8
When the protrusion 10a of the handle 10 is inserted into the hole e and the drive shaft 8 is rotated in the direction of the arrow A, the winding drum 2 moves in the direction of the arrow A through the pin 9, the drive drum 5, the second gear 5a, and the first gear 2a. ’ direction.
Thereby, the rope R is wound onto the winding drum 2 and is tensioned.

That is, in FIG. 8, when the drive shaft 8 is rotated in the direction of arrow A, the first ear 8c of the notch 8b of the drive shaft 8 presses the first end 7a of the coil spring 7. The diameter of the coil spring 7 is reduced by pressing the first end 7a in the direction of arrow A, so that the pressing force between the coil spring 7 and the inner surface of the fixed cylinder 6 and the inner surface of the drive drum 5 is weakened. That is, the connection between the drive drum 5 and the fixed cylinder 6 is weakened, and the drive drum 5 is set in a rotatable state. After that, drive shaft 8
The pin 9 implanted in the engagement hole 5b of the drive drum 5
The rotation of the drive shaft 8 causes the drive drum 5 to abut on the end of the drive drum 5.
transmitted to. Thereafter, as shown in FIG. 3, the winding drum 2 is rotated in the direction of arrow A' via the second gear 5a and the first gear 2a.

b Regarding the operation of keeping the rope taut After rotating the winding drum 2 and winding the rope R until it reaches a predetermined tension state, when the force of rotating the handle 10 is removed, the first end 7a of the coil spring 7 Since the force pressing the coil spring 7 is removed, the coil spring 7 expands its outer diameter by its own elastic force. That is, the outer diameter portion of the coil spring 7 is in close contact with the inner circumferential surfaces of each of the fixed cylinder 6 and the drive drum 5. At the same time, a force is applied to the drive drum 5 to rotate it in the direction of loosening the rope due to the tension of the rope R, that is, in the direction of arrow B in FIG.
However, when the drive drum 5 attempts to rotate in the direction of arrow B, the coil spring 7 is acted upon to expand its outer diameter due to the frictional force between the inner peripheral surface of the drive drum 5 and the outer diameter of the coil spring 7. , the outer diameter of the coil spring 7, the fixed cylinder 6 and the drive drum 5
The pressure contact force with the inner circumferential surface of each is increased.

That is, since the drive drum 5 is connected to the fixed cylinder 6 via the coil spring 7,
It is held in a state where it cannot rotate. Further, the winding drum 2 is similarly held in a non-rotatable state via the second gear 5a and the first gear 2a.

The rope R is therefore held under tension as soon as the force rotating the handle is removed.

c Regarding the operation of relaxing the rope In FIG. Press the end 7b. The coil spring 7 has a second end 7b
By being pressed in the direction of arrow B, its outer diameter is reduced, so that the pressing force with the inner circumferential surfaces of each of the fixed cylinder 6 and the drive drum 5 is weakened.
In other words, the connection between the drive drum 5 and the fixed cylinder 6 is weakened, and the drive drum 5 is set in a freely rotatable state.

On the other hand, the tension of the rope R acts on the drive drum 5 to rotate it in the direction of loosening the rope R, that is, in the direction of arrow B in FIG.

Accordingly, as the drive shaft 8 is rotated by the handle 10, the drive drum 5 is rotated in the direction of arrow B shown in FIG. 3 by the tension of the rope R. Further, the winding drum 2 is rotated by the tension of the rope R, and the first gear 2a and the second gear 5
a, depending on the rotational state of the drive drum 5,
The rope R is rotated in the direction of the arrow R' shown in FIG.
is relaxed.

Note that when the drive drum 5 rotates in the direction of arrow B due to the tension of the rope R, its rotational speed is equal to the drive shaft 8.
When the rotational speed is higher than the rotational speed of , the frictional force generated between the drive drum 5 and the coil spring 7 causes the coil spring 7 to move in the direction of expanding its outer diameter. Therefore, the frictional force between the outer diameter portion of the coil spring 7 and the inner peripheral surfaces of the fixed cylinder 6 and the drive drum 5 becomes high, and the drive drum 5 becomes fixed to the fixed cylinder 6. That is, usually handle 1
When the drive shaft 8 is rotated in the direction of the arrow B by 0 to weaken the frictional force between the coil spring 7, the fixed cylinder 6, and the drive drum 5, the tension of the rope R causes the take-up drum 5 to move toward the drive drum 5. It rotates in the direction of arrow B', which is the direction to loosen the rope R, depending on the rotational state of the rope R. When the rotation of the drive shaft 8 by the handle 10 is stopped, the rotation of the drive shaft 8 due to the tension of the rope R is stopped by the frictional force caused by the coil spring 7. Further, the rotation of the winding drum 5 is also stopped.
Further, when the rotational speed of the drive drum 5 due to the tension of the rope R is high, the drive drum 5 is stopped immediately without stopping the rotation of the drive shaft 8 by the handle 10. Of course, if the drive shaft 8 is being rotated by the handle 10, the rotation will be immediately resumed. Therefore, the drive drum 5 does not rotate at high speed due to the tension of the rope R, but rotates according to the rotational speed of the drive shaft.

As described above, in this embodiment, each operation can be performed smoothly and reliably.

In addition, in this embodiment, by configuring the large diameter first gear 2a provided on the winding drum 2 to be rotationally driven by the small diameter second gear 5a provided on the drive drum 5, the handle can be rotated. 10 operating forces can be reduced depending on the gear ratio. As a result, the tension maintaining operation can be easily performed without using a long handle.

Furthermore, since the tension of the rope R acting on the drive drum 5 is reduced when the rope is held under tension, a coil spring 7 with low rigidity can be used for locking the rotation of the drive drum 5. As a result, the operating force of the handle when tensioning or relaxing the rope R can be reduced.

By configuring the pin 9 implanted in the drive shaft 8 to engage with the circumferentially long engagement hole 5b provided in the drive drum 5, the operating force of the handle at the start of the tensioning operation of the rope R is reduced. can be reduced.

That is, when the handle 10 is rotated, the frictional force by the coil spring 7 is first weakened, and then the pin 9 implanted in the drive shaft 8 comes into contact with the circumferential end of the engagement hole 5b of the drive drum 5. , drive drum 5
rotational operation is performed. Therefore, compared to the conventional system shown in FIGS. 11 to 16, in which the two operations are started simultaneously when the tensioning operation of the rope R is started, the operating force of the handle 10 can be significantly reduced.

The spring clutch mechanism in this example is as follows:
A coil spring is inserted into a fixed member and a rotating member, and the pressure force of the coil spring is adjusted by rotating the drive shaft. One end is fixed to the fixed member and the other end is unlocked. A coil spring hooked to a member may be inserted or inserted into a drive drum, a winding drum, or the like.

In this embodiment, the drive device is composed of a drive drum to which a gear is attached and a drive shaft that is directly rotationally driven by a handle; It's okay if it's hot.

In this embodiment, the tension holding device can be attached to the side surface of the support column, but it may also be configured so that it can be attached to the internal space of the support column or the like and can be operated from the outside with a handle.

(Effects of the Invention) The present invention separates the winding drum and drive device and uses a gear train capable of boosting power transmission between the two, thereby replacing the conventional winding drum and drive device. Compared to an integrated structure, the operating force of the handle that rotates the winding drum can be reduced depending on the gear ratio.

Furthermore, in the case where the spring clutch mechanism is connected to the drive device, since the tension of the rope acting on the drive device is reduced by the gear train,
A spring with low stiffness can be used in the spring clutch mechanism. As a result, the operating force of the handle can be reduced in each operation such as tensioning and relaxing the rope.

[Brief explanation of drawings]

1 to 3 are a front view, a left side view, and a right side view of the embodiment, FIG. 4 is a sectional view taken along line xx' in FIG. 3, and FIGS. 5 and 6 are a 4 is a y-y' line and z-z' line sectional view, FIG. 7 is an enlarged view of the main part of Fig. 4, Fig. 8 is an enlarged view of the main part of Fig. 6, and Fig. 9 and Figure 10 is a front view and a plan view of the handle, the first
1 to 16 are diagrams showing conventional examples. 1... Bracket, 2... Winding drum, 2
a...First gear, 5...Drive drum, 5a...Second gear, 5b...Engagement hole, 6...Fixed cylinder, 7...Coil spring, 7a, 7b...First of coil spring 7 End portion and second end portion, 8... Drive shaft, 8
b...notch, 8c, 8d...first and second ears of notch 8, 8e...square hole, 9...pin, 1
0...handle, P...post, R...rope.

Claims (1)

[Scope of Claims] 1. A winding drum, a drive device, and a gear train for transmitting boost power from the drive device to the winding drum;
A spring clutch mechanism that locks the rotation of the winding drum by a frictional force generated between the drive drum of the drive device and a coil spring attached to the drive drum, and a blanket that supports each of the above-mentioned members. Features: Tension retention device for ropes, etc. 2. The drive device includes a drive drum, a drive shaft provided concentrically and connected to the drive drum, and the spring clutch mechanism includes a fixed cylinder fixed to a bracket, the fixed cylinder and the drive shaft. Claim 1 comprising a coil spring provided in pressure contact with the inner circumferential surface of each of the drums and having both ends engaged with the drive shaft in different rotational directions of the drive shaft. Tension holding devices such as ropes as described in Section 1.