JPH0432497A - Lifting and lowering system for ball protective net - Google Patents

Abstract

PURPOSE:To simplify stretching of a rope by providing an auxiliary up and down direction direction guiding pulley at a position some distance apart from a net between the top of a post and a lower guide pulley, thereby providing one lifting and lowering rope in a loop, and moving the rope by power. CONSTITUTION:A lifting and lowering rope 5 guided by guide pieces 8 along a guide rope 2 laid and stretched between the top of a post and the ground part, is able to move up and down between an upper guide pulley 3 and a lower guide pulley 4. The top of a net 1 is fixed to the lifting and lowering rope 5, and the lifting and lowering rope 5 is moved up and down between the upper guide pulley 3 and the lower guide pulley 4 to lift and lower the net 1. Further, an auxiliary guide pulley 7 is provided between the pulleys 3, 4 some distance apart from the lifting and lowering side face of the net 1 in order to serve as a which, and fifting and lowering rope 5 is laid over the guide pulley 3, the auxiliary pulley 7, the guide pulley 4 in a loop. Thus, stretching of the lifting and lowering rope 5 is simplified to reduce the number of pulleys.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is designed to prevent erroneously lit fly balls from flying in abnormal directions and causing problems at golf courses, golf practice ranges, baseball fields, etc. Regarding the lifting and lowering system of the protective net that is stretched to prevent the ball from falling, it is possible to raise and lower it safely and smoothly by using power, and it is also possible to raise and lower multiple supports at the same time using a single lifting rope. This relates to the elevating system for the ball protection net.

[Prior Art] At golf courses, golf practice ranges, baseball fields, etc., there are cases where a fly ball accidentally flies in an abnormal direction, and in order to prevent problems caused by such an abnormal fly ball. A ball-prevention net that is 30 to 40 meters high has been erected. This ball-prevention net uses a synthetic fiber net, and is usually configured to be pulled up to a support manually or electrically. The design standard for such ball protection nets is that the strength of the pillars is 30m/sec.
The net should be able to withstand wind speeds of 20 to 25 cm.
When the wind speed reaches m/iec, it is to be lowered to avoid wind damage.

Therefore, when a typhoon comes or strong gusts blow, the net must be lowered, but when the wind speed is 20 to 25 m/s
When the net becomes EC, there is a lot of wind pressure on 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. Conventionally,
In order to increase the net's own weight against the resistance caused by wind pressure and make it come down with its own weight, a weight is attached to the top of the net to increase the net's own weight. It was designed to make it easier to pull down the net.

If a weight is attached to the top of the net as described above, the top of the net will drop and curve, causing a bad appearance, and if the weight is attached only to the top of the net, that part will be damaged. There is also the problem that it is easy for this to occur, and if the weight comes off and falls from above, there is a risk that human life will be at stake if there is a person underneath it. As described above, designing the net so that a weight is attached to the top and the net descends due to its own weight is not necessarily without problems.

[Problem to be solved by the invention] In order to solve the above-mentioned problems, recently, instead of attaching weights to the net, an electric winch is used to lower the net. method has been adopted.

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 5 and 6 show two specific examples of how the conventional lifting rope 16 is attached when the ball protection net 1 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 part auxiliary pulleys 15 are arranged, and the number of pulleys is as large as 12 in the case of Fig. 5 and 14 in the case of Fig. 6. The method of installing the mount is very complicated.

In addition, with this method of making one set with three supports, there is a problem that when the nets are lowered, they do not lower to the same height because the lengths of the moving ropes are the same for the supports of different heights. There is.

Furthermore, since the installation of a complicated rope requires a method, the length of the rope becomes long (40m high and the spacing between the supports is 10m).
(If so, the total length would be about 300 meters), which increases the amount of expansion and contraction of the rope due to changes in temperature, and there is also the problem that a -shaft type winch will slip, making it difficult to raise and lower the net.

The purpose of the present invention is to solve the above-mentioned problems of the prior art, to reduce the number of pulleys, and to greatly simplify the overall rope installation method, thereby reducing the number of supports. To provide a new system for raising and lowering a ball protection net, which allows the net to be raised and lowered freely regardless of the situation.

[Means for Solving the Problems] The present invention provides a device for raising and lowering the net by fixing the top of the net to a lifting rope and moving the lifting rope up and down. A vertical guide auxiliary pulley is provided at a position apart from the lifting surface, and a continuous lifting rope is looped and installed from the upper guide pulley, through the vertical guide auxiliary pulley, and then to the lower guide pulley. The system is constructed so that the net can be raised and lowered by moving the rope in the forward and reverse directions using power, and when the net is raised and lowered on multiple supports, the upper guide pulley passes through the vertical guide auxiliary pulley. By guiding one continuous lifting rope to the lower guide pulley of an adjacent column, and forming similar paths as necessary, the lifting ropes of multiple columns can be connected to one lifting rope. Finally, the lifting rope is made into a continuous loop via a horizontal guide auxiliary pulley, and a vertical guiding auxiliary pulley is provided at the position closest to the power source to provide the power for moving the lifting rope. It uses an electric winch that also doubles as a winch.

[Function] If the vertical guide auxiliary pulley is provided between the upper and lower guide pulleys at a position separated from the lifting surface of the net, there is no risk that the net will be rubbed by the lifting rope when the net is raised and lowered, and This can prevent damage to the net caused by In addition, by providing a vertical guide auxiliary pulley, the lifting rope can be guided between the upper guide pulley and the lower guide pulley of the adjacent column, so even if the number of columns increases, the minimum number of pulleys can be used. Using this, it is possible to install the lifting rope so that it will take the shortest distance. Furthermore, if an electric winch installed closest to the power source and also serving as a vertical guide auxiliary pulley is used as the power to move the lifting rope, the number of vertical guide auxiliary pulleys can be reduced by one. In addition, the installation and wiring of the electric winch can be simplified.

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

FIG. 1 is an explanatory diagram showing a case in which a net is raised and lowered on one support using the lifting system according to the present invention.

In the present invention, a guide rope 2 is stretched between the top of a support (not shown) and the ground part, and a lifting rope 5 for raising and lowering the net 1 is attached to the guide rope. A guide piece 6.6, such as a 8-shaped tube, which can be guided along the guide rope 2 is attached, and the lifting rope 5 can be moved up and down along the guide rope 2 between the upper guide pulley 3 and the lower guide pulley 4. It is composed of

The net 1 can be moved up and down by fixing the top of the net 1 to the lifting rope 5 and moving the lifting rope 5 between the upper and lower guide pulleys 3 and 4 in the vertical and reverse directions.

In order to make the moving loop the shortest distance in this case, it is better to attach a lifting rope as shown by the dotted line in FIG. 1, but if it is attached in this way, it will be very difficult to attach the winch.

In the present invention, a vertical guide auxiliary pulley (in FIG. 1, a winch-duty guide pulley 7 as described later) is located between the upper guide pulley 3 and the lower guide pulley 4 and at a position spaced apart from the lifting surface of the net 1. ), and the lifting rope 5 leaving the upper guide pulley 3 is once guided to the lower guide pulley 4 via the vertical guide auxiliary pulley as shown by the solid line.

The embodiment shown in FIG. 1 shows an example in which the above-mentioned vertical guide auxiliary pulley is also used as a winch, and a guide pulley 7 is used as a winch, as indicated in parentheses. If the winch also serves as the vertical guide assist pulley in this way, the number of guide pulleys can be definitely reduced by one.

Moreover, since the winch-cum-guide pulley 7 is installed apart from the lifting surface of the net 1, the winch itself can be installed very easily, and the winch function can be fully utilized. However, it is not limited to always using the winch and the vertical guide auxiliary pulley. For example, it is possible to separately install a vertical guide auxiliary pulley at the position 7 in FIG. 1, and to separately provide a winch between the separate pulley and the lower guide pulley 4.

FIG. 2 is an explanatory diagram showing an example in which the elevating system according to the present invention is applied to two columns.

The difference between this embodiment and the case shown in FIG. 1 is that the upper guide pulley 3□ and the lower kite pulley 42 of the adjacent column
An auxiliary guide pulley 8 in the vertical direction is provided between the auxiliary pulley 8 and the lifting rope 5 guided to the lower guide pulley 4□ of the adjacent column via the auxiliary pulley 8.

Even in the case of Fig. 2, the upper guide pulley 3. The shortest distance between the lower guide pulley 42 of the adjacent column is indicated by a dotted line in the figure, but when the lifting rope 5 is provided in this way, the lifting rope 5 is There is a great possibility that the rope 5 will rub against the net 1 and damage the net 1 made of synthetic fibers. Further, the shortest distance between the upper guide pulley 3□ and the horizontal guide pulley 9 is also shown by the dotted line, but this is not preferable because the angle between the pulley 9 and the rope 5 becomes unreasonable.

Considering the mounting position of the winch 10 when the lifting rope 5 is installed as shown in FIG. 2, there are many possible positions as shown by the dotted lines in the figure.

However, in this case as well, it is most desirable to provide a guide pulley 7 that also serves as a winch, as in FIG.

Then, in order to loop the entire lifting rope 5, a horizontal guide auxiliary pulley 9 is installed as shown in the figure, and the lifting rope 5 is connected to each pulley 3□→8→42→3□→7→9.
→4. By forming a continuous loop in this manner, the lifting rope 5 can be attached most efficiently over a short distance, and the winch-cum-guide pulley 7 can be used to drive the rope in forward and reverse directions very smoothly.

In this case, as in the case of three or five pillars, which will be explained later, if the winch-cum-guide pulley 7 is installed at the position closest to the power source, wiring and overall layout can be simplified. It is possible to reduce costs.

FIG. 3 is an explanatory diagram showing a case where the elevating system according to the present invention is applied to three pillars. When this is compared with the previous conventional example shown in FIGS. 5 and 6, the lifting rope 5
It will be clearly seen that the manner of attachment has been greatly simplified and the length of the lifting rope 5 has been shortened as a result. Further, the number of guide pulleys in this case is 9, which is 3 fewer than the 12 in FIG. 5 and 5 fewer than the 14 in FIG. 6. As described above, the present invention has the excellent advantage of being able to greatly reduce the number of guide pulleys, which not only leads to a reduction in public costs, but also
Even if the number of target supports is increased, the overall structure can be simplified.

FIG. 4 is an explanatory diagram showing a case where the lifting system according to the present invention is applied to five columns as an example of increasing the number of columns. It can be said that this figure clearly discloses that the lifting system according to the present invention can be easily applied to a large number of columns by simply increasing the number of vertical guide auxiliary pulleys according to the number of columns.

As for specifically how many pillars the present invention is applied to,
The weight of the ball protection net when raising and lowering it, the resistance value when lowering the net in strong winds, etc. are taken into consideration to decide how many meters the net should be raised and lowered at once. For example, in the case of a ball protection net with a relatively low height of about 30 m, it is quite possible to raise and lower the net with 5 to 6 pillars with one winch. All you have to do is raise and lower it with a small winch.

In addition, although a one-drum type winch is illustrated in the above-mentioned embodiment, a two-drum type winch is used to absorb the expansion and contraction caused by temperature differences in the lifting rope or elongation due to aging, and to eliminate problems caused by elongation. It is recommended to use this method, and the applicant has separately proposed a new specific configuration thereof. (Patent application Hei 1-29284
9) [Effects of the Invention] As described above, the elevating system according to the present invention can exhibit the following excellent effects.

(1) The method of tensioning the lifting rope is very simple, and the design is easy and inexpensive.

(2) Fewer pulleys are required, resulting in lower construction costs.

(3) Golf practice ranges often have different heights of ball protection nets, but depending on the content, one winch per pillar may be used.
You can choose from a stand to a column of 2.3, 4.5, etc. and one winch per book, making it more economical overall.

(4) By using a guide pulley that also serves as a winch, the number of guide pulleys can be definitely reduced by one, and the guide pulley that also serves as a winch can be placed at the terminal of a combination of multiple columns, and it should be placed closest to the power source. (By installing it, the equipment can be simplified and the installation cost can be reduced accordingly.

[Brief explanation of drawings]

Figure 1 shows an embodiment in which the present invention is applied to one support, Figure 2 to two support, Figure 3 to three support, and Figure 4 to five support. Illustrations, 5th and 6th
The figure is an explanatory diagram showing a conventional example. 3, 3. ~3°4,4. ~4°8,8. ~84: Ball prevention net, double guide rope, : Upper guide pulley: Lower guide pulley: Lifting rope, = 8-shaped tube, : Winch dual-use guide pulley: Vertical guide auxiliary pulley - Horizontal guide auxiliary pulley Figure 1

Claims (3)

[Claims] (1) A guide rope is stretched between the top of the support and the ground side, and a guide piece such as a figure-8 tube is attached to the guide rope to support and guide the lifting rope for hoisting and lowering the net. In the lifting device in which the lifting rope is configured to be movable up and down along the guide rope, and the top of the net is fixed to a part of the lifting rope, the net is separated from the lifting surface between the upper and lower guide pulleys. A vertical guide auxiliary pulley is installed at the position where the vertical guide auxiliary pulley is placed, and a continuous lifting rope is looped from the upper guide pulley to the vertical guide auxiliary pulley and then to the lower guide pulley, and the lifting rope is powered. A system for raising and lowering a ball protection net, which is constructed so that the net can be raised and lowered by moving it in the forward and reverse directions. (2) By guiding one continuous lifting rope from the upper guide pulley via the vertical guide auxiliary pulley to the lower guide pulley of the adjacent column, and forming similar routes below as necessary. 2. The ball protection net elevating system according to claim 1, wherein the elevating ropes of the plurality of pillars are continuous with one elevating rope, and finally the elevating rope is formed into a continuous loop via a horizontal guide auxiliary pulley. . (3) The ball protection net elevating system according to claim 1 or 2, wherein the power for moving the elevating rope is an electric winch provided at a position closest to the power source and also serving as an auxiliary pulley for vertical guidance.