JPH0441396A - balance winch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to golf courses, golf practice ranges, baseball fields, etc., where a ball protection net for preventing abnormal fly balls is raised and lowered using a lifting rope. This invention relates to a balance winch that is extremely useful for use.

[Prior Art] In golf courses, golf practice ranges, and even baseball fields, heights of 3.
A ball-prevention net stretching from 0 to 40 meters has been erected. The design standard for such ball protection nets is that the strength of the pillars is 30m/
It should be able to withstand wind speeds of +ec, and the net should be 20~
When the wind speed reaches 25 m/sec, the tower is to be lowered to avoid damage from the wind.

Therefore, when a typhoon approaches or when strong gusts blow, the net must be lowered, but when the wind speed is 20 to 25 m/+
When it becomes EC, heavy wind pressure is applied to the net, and when trying to lower the net, there is considerable resistance from the wind, and the net often does not come down easily. As a result, there have been occasional accidents where the nets have not been lowered and concrete supports have broken due to wind pressure.

Therefore, in recent years, there have been many cases in which a method is adopted in which an electric winch is used to lower the net, instead of using the net's own weight to lower it manually.

However, installing an electric winch to each support column increases equipment costs, so in many cases one winch is installed for every three supports.

Figures 3 and 4 show two specific examples of how the conventional lifting rope 16 is attached when the ball protection net l on three pillars is lifted and lowered by one winch 10. It is.

The net 1 is configured to be raised and lowered by a lifting rope 16 that reciprocates between an upper guide pulley 11 and a lower guide pulley 12, and the lifting rope 16 is moved back and forth by an electric winch 10 provided on a central column. . That is, when lowering the net 1, if the electric winch 10 is driven so that the lifting rope 16 moves in the direction shown by the arrow in each figure, the net 1 can be lowered by the electric winch 10 without depending on the net's own weight. It can be forcibly pulled down.

However, in the conventional configuration described above, in addition to the upper and lower guide pulleys 11 and 12, the horizontal guide auxiliary pulley 13.13 and the upper and lower guide auxiliary pulley 14
．． 14 or a large number of winch section auxiliary pulleys 15 are arranged, and the number of pulleys is as large as 12 in the case of Fig. 3 and 14 in the case of Fig. 4. The method of installing the mount is very complicated.

Furthermore, due to the complicated rope installation as mentioned above, the length of the rope becomes long (40m high and the spacing between the supports is 10m!: That makes the total length about 300m), and due to changes in temperature. There was also the problem that the rope had to expand and contract more, and the -shaft type winch would slip, making it difficult to raise and lower the net.

Therefore, the applicants proposed a separate method for attaching the lifting rope 5 using a simpler method, as shown in FIG. 2, and reducing the number of pulleys compared to the above-mentioned conventional example.

A guide rope 2 is stretched between the top of the support and the ground side, and a guide piece 6 such as an 8-shaped tube capable of supporting and guiding a lifting rope 5 for raising and lowering the net is attached to the guide rope 2. 6 is attached so that the lifting rope 5 can be moved up and down along the guide rope 2, and the lifting rope 5
The top of the net 10 is fixed to a part of the upper pulley 37.
32 and the lower guide pulleys 41 and 42, a vertical guide auxiliary pulley 8. ．． 82 is provided, and the upper guide pulley 3.
From there, through the vertical guide auxiliary pulley 81, through the lower guide pulley 42, and then to pulley 3□-8□→43→
3. → A continuous lifting rope 5 that passes through the horizontal auxiliary pulley 9 is installed in a loop, and the net can be lifted and lowered by moving the lifting rope 5 in forward and reverse directions using power. It is composed of

[Problem to be solved by the invention] According to the method for installing the above-mentioned lifting rope, the number of columns is 3.
Not limited to books, lifting ropes can be freely looped and installed around 1 to 5 pillars, making it possible to raise and lower the net very efficiently.

However, of course, as the number of supports increases, a considerably stronger tension is applied to the winch when raising and lowering the net 1, and as mentioned above, when the length of the rope reaches 300 m, it is difficult to raise and lower the net. It is difficult to maintain tension on the rope at all times, and as the rope gradually stretches during use, there is a problem in that the length must be adjusted with considerable precision. Moreover, if too strong tension is applied, there is a risk that the concrete support will bend.

If the tension is weakened to avoid the problems mentioned above, other problems will occur, such as the rope slipping on the drum and making it difficult to raise and lower the net. What existed was the status quo.

An object of the present invention is to solve the above-mentioned problems of the prior art in an extremely appropriate manner, to prevent slipping during winding on a winch even without applying strong tension over the entire length of the rope, and to prevent slippage during winding of the rope during use. The present invention aims to provide a new balance winch that can automatically and efficiently absorb and adjust linear expansion and elongation due to seasonal and day-night temperature differences.

[Means for Solving the Problems] The present invention provides a winch configured to wind a rope around a winch drum and apply tension to the rope in the forward and reverse directions by rotating the drum in forward and reverse directions. The main idea is that the ropes on both sides to be taken are left slack in a slightly U-shape, and a free-moving pulley with a weight is placed at the bottom of the slack in the slightly U-shape. The movable pulley on the side that winds up the rope and applies tension to the rope is temporarily stopped moving at a predetermined position, and the movable pulley on the opposite side of the rope can be in a free state; The stop position of the movable pulley that is brought to a stopped state can be adjusted, and is configured to adjust and absorb elongation due to linear expansion of the rope due to seasonal or day/night temperature differences.

[Action]In addition to the tension generated when the net is raised and lowered on the rope wound around the co-winch drum, moving pulleys with weights are installed on the ropes on both sides of the drum, and the weights on both sides are used to generate tension on the drum. If a tightening load is applied, the contact friction force between the winch drum and the rope can be maintained stably at all times by the weights on both sides.
By selecting the weight, slippage between the drum and the rope can be completely eliminated.

Moreover, since the weight is attached to a free-moving pulley,
Even if the rope elongates over time or expands and contracts due to temperature differences, the movable pulley moves up and down on its own to automatically absorb the expansion and contraction of the rope. It is possible to eliminate the need for adjusting the rope length.

[Examples] The present invention will be specifically described below with reference to Examples.

FIG. 2 shows a balance winch 7 according to the present invention installed as a drive source for the lifting rope 5 of a ball protection net, which is formed by arranging the lifting rope 5 in a loop according to an installation method separately proposed by the applicants. FIG. 2 is an explanatory diagram showing the situation.

If the lifting rope 5 is wound by the balance winch 7 so as to be moved in the direction of the solid line arrow, the net 1 will rise, and if it is wound so as to be moved in the direction of the dotted line arrow, the net 1 will be lowered.

Conventionally, problems have been caused by slippage of the rope on the circumference of the drum as described above during winding movement of the lifting rope 5, excessive tension load, or expansion and contraction of the rope due to elongation over time or temperature difference. There were always problems with slack and over-tensioned ropes.

The balance winch 7 according to the present invention specifically has a configuration as shown in FIG.

In the figure, 7a is a winch drum for applying tension around which the rope 5 is wound, and the rope 5 is wound around the winch drum 7a multiple times as necessary, and the rope 5 is rotated in forward and reverse directions by electric power. A tension force is applied in the direction of the solid line or the dotted line.

The difference between the present invention and conventional winches is that the ropes 5 on both sides of the winch drum 7a have a U-shape as shown in the figure (this does not have to be strictly a U-shape, but can be close to a 7-shape). The point is that a slack is formed, and free moving pulleys 7b and 7c having balance weights 7e and 7f are provided at the bottom of the slack. In addition, in the figure, 7d is a winch guide pulley for giving slack to the rope 5.

The operation of the balance winch 7 according to the present invention configured as described above will be described next.

Now, consider the case where the rope 5 is wound in the direction of the solid arrow in FIG. 2, that is, in the direction in which the net 1 is raised.

The winch drum 7a is rotated in the direction of the solid arrow,
The lifting rope 5 is wound up, and at the same time the rope 5 on the opposite side is sent out in the direction of the solid arrow, causing the loop of the lifting rope 5 shown in FIG. 2 to rotate.

A strong tension for pulling up the net 1 is applied to the rope 5 on the side that is pulling up the net 1, and the moving pulley 7b having the weight 7e starts to move upward from the position (C) due to the tension, but the moving pulley When 7b rises to position (A), it is stopped by a stopper (not shown),
The ascent is stopped in the state shown by the dotted line in (A), and rotation continues only in the direction shown by the solid arrow.

By stopping the pulley 7b in this way,
The tension caused by the winch drum 7a becomes maximum, and the net 1
to a predetermined height.

In the present invention, weights 7e and 7f (approximately 30 to 50 kg) whose weights are balanced are suspended from the ropes 5 on both sides of the winch drum 7a via pulleys 7b and 7c. The tightening force balanced by the weights of the weights 7e and 7f is constantly applied to the rope 5, which is attached to the rope 5, and the rope slips around the drum like a conventional winch that does not have such weights. This will completely eliminate the situation where tension loading is no longer possible.

Conversely, when pulling down the net 1 by applying tension to the lifting rope 5 in the direction of the dotted arrow in FIG. 2, the winch drum 7a in FIG.
is wound in the direction of the dotted arrow. In this case, the moving pulley 7C is moved upward by tension, and similarly (A
), the net 1 continues to rotate in the direction of the dotted arrow while being stopped by the stopper, and a strong tension is applied to the rope 5 in the direction of the dotted arrow, and the net 1 is forcibly pulled down.
There is no fear that Net 1 will stop lowering due to wind pressure midway through.

In this case, the other movable pulley 7b is lowered to the position (C) and tension is applied by the weight 7e, so that the entire loop of the lifting rope 5 does not loosen.

In this case, as in the case of pulling up the net 1, the rope 5 does not slip on the circumference of the drum 7a due to the action of the weights 7f and 7e, and the rope 5 is smoothly wound up and the net 1 is thereby reliably pulled down. It becomes possible.

The lifting rope 5 expands and contracts due to seasonal temperature differences such as summer and winter, or day and night temperature differences, and also gradually stretches during use.

Even in this case, for example, if the length of the rope 5 shrinks in the winter, the stopping positions of the pulleys 7b and 7c can be changed to the position (B), and if the rope stretches in the summer, the position (C) only needs to be lowered a little. The amount of expansion and contraction of the rope 5 described above is defined as this U
The slack in the shape is absorbed freely, and the weights always keep a constant tension on the rope. Therefore,
This method has the great advantage of completely eliminating the risk of the rope shrinking too much due to a drop in temperature and causing the concrete support to curve, or conversely, the risk of the rope stretching too much and causing the net to sag, as in the conventional example.

It goes without saying that the above-mentioned technical idea of the present invention is not limited to use only in winches for raising and lowering ball protection nets. For example, it is extremely useful when horizontally pulling a truck with a winch or when winding up a long wire that requires a large winding tension.

Effects of the Invention As described above, the winch according to the present invention has a simple structure and is inexpensive because it only requires adding a balance weight, and can extremely easily absorb expansion and contraction due to temperature differences in the winding rope. While a constant tension can always be applied to the rope, the risk of such expansion and contraction directly affecting the supporting structure is completely eliminated, so it can be applied maintenance-free to elevating equipment for ball protection nets, etc. By linking it with a meter, it is possible to ascend and descend automatically, and it also eliminates the risk of rope breakage and support columns collapsing, providing a number of excellent benefits.

[Brief Description of the Drawings] Fig. 1 is an explanatory diagram showing the operation of the embodiment according to the present invention;
The figure is an explanatory diagram showing how the winch according to the present invention is attached to a ball protection net lifting device, and FIGS. 3 and 4 are explanatory diagrams showing two embodiments of the conventional ball protection net lifting device. 5: Lifting rope, 7: Balance winch, 7a: Winch drum, 7b, 7c: Freely movable pulley, 7d: Winch guide pulley 7e, 7f: Balance weight.

Claims (3)

[Claims] (1) In a winch configured to wind a rope around a winch drum and apply tension to the rope in the forward and reverse directions by rotating the drum forward and backward, the ropes on both sides wound around the winch drum are slightly U-shaped. Sag, slightly U
A balance winch consisting of a free-moving pulley with a weight placed at the bottom of a letter-shaped slack. (2) The structure is such that the winch drum can temporarily stop the moving pulley on the side that winds the rope and applies tension to the rope at a predetermined position, and allows the moving pulley on the opposite side of the rope to be in a free state. The balance winch according to claim 1, comprising: (3) The stop position of the movable pulley that stops moving when loaded with tension is adjustable, and is configured to adjust and absorb elongation due to linear expansion of the rope due to temperature differences due to seasons or day and night. Balance winch as described.