JPH0553155B2 - - Google Patents

Description

[Detailed Description of the Invention] <Object of the Invention><Industrial Field of Application> The present invention relates to a ball protection device whose main component is a ball protection net that is installed, for example, at a golf driving range and prevents balls from flying to the outside. In particular, this invention relates to a novel configuration that allows the ball protection net to be reliably raised and lowered.

<Background of the Invention> As is well known, a golf driving range is connected to adjacent houses, etc.
To prevent the ball from flying out to other facilities,
A high ball-protection net is placed around the area. There are many types of these, ranging from those in which a ball-protection net is simply stretched over a support column to those in which the ball-protection net is pulled down in the event of strong winds. However, even if the conventional type is capable of being pulled down in case of strong winds, it has not been able to perform its function satisfactorily. That is, conventionally, for example, the upper edge of the ball-protecting net is suspended by a wire directly from a support or via a pulley, and by loosening the wire, the ball-protecting net is lowered and retracted by its own weight. And since there are almost no special measures beyond that, even if you actually try to pull down the ball net in strong winds, the ball net gets blown up by the wind and gets pushed against the support, creating a lot of resistance. In reality, in such a situation, it is no longer possible to withdraw. Of course, there is a method of forcibly pulling the ball net downwards instead of relying on its own weight, but as mentioned earlier, when the ball net is pressed against a support etc. If such a pulling operation is performed, the ball protection net that is hooked to the support will break, so it cannot actually be pulled down. For this reason, in the past, most of the ball protection nets that were once erected were left in place even during strong winds, except for occasions such as maintenance, and as a result, they were often damaged, and furthermore, the ball protection nets were not strong enough to support the ball protection nets that were blown up in strong winds. Since strength is required of the pillars, etc., the load capacity of the pillars must be correspondingly large, resulting in a large-scale construction and an increase in equipment costs. In addition, although the pillars are designed with an appropriate safety factor based on the expected maximum wind force, it is assumed that the wind will blow through between the ball protection nets. If agricultural or horticultural vinyl sheets or the like are stuck to the ball-proof net, they will be subjected to significant wind pressure, which could lead to an unexpected situation such as the entire device collapsing. Furthermore, this kind of ball net is set high enough to prevent the ball hit by the player from flying out, but if the ball has spin (rotation), for example, the net will be placed above the ball net. When a ball is hit by a golf ball, the rotational force causes the golf ball to move as if climbing up the ball net and fly out to the outside.

<Technical matters for which the development was attempted> The present invention has been developed in view of this background, and it is possible to raise and lower the ball protection net at all times, and also to adjust the height of the entire device. This is an attempt to develop a new ball protection device for golf driving ranges, etc. that can sufficiently protect the ball net and provide safety measures, as well as reliably prevent balls from flying out. .

<<Structure of the Invention>><Means for Achieving the Object> That is, the first invention of the ball protection device for a golf driving range, etc. according to the present application is a ball protection device for a golf driving range, etc., in which the external In the device for preventing a ball from flying to the top, the support is configured such that a plurality of movable supports can be sequentially stored with respect to a base fixed support while being extendable in an upward direction, each support has a triangular cross section, and the uppermost movable support supports An elevating beam is supported at the elevating beam, and a ball protection net is suspended from the elevating beam.

In addition to the above-mentioned requirements, a second invention of a ball protection device for a golf driving range or the like according to the present application includes, in addition to the above-mentioned requirements, when supporting an elevating beam by the movable support,
This device is characterized in that the lifting beam is suspended by a net winch wire.

Furthermore, a third invention of a ball protection device for a golf driving range, etc. according to the present application, in addition to the above-mentioned requirements, is such that the elevating beam is suspended by a net winch wire from a suspension beam protruding inward from the center of the support. It is characterized by the fact that

Furthermore, a fourth invention of a ball protection device for a golf driving range or the like according to the present application is characterized in that, in addition to the above-mentioned requirements, each of the pillars and the elevating beams has a truss structure.

Furthermore, a fifth invention of a ball protection device for a golf driving range or the like according to the present application is characterized in that, in addition to the above-mentioned requirements, the ball protection net is freely supported on a guide wire via a guide ring. be.

Furthermore, a sixth invention of a ball protection device for a golf driving range or the like according to the present application is characterized in that, in addition to the above-mentioned requirements, the ball protection net has an eave-like projecting portion with an upper end facing inward. It is something.

These configurations are intended to achieve the above object.

<Operation of the Invention> In the present invention, the elevating beam supported by the pillar suspends the ball protection net. This allows the ball protection net to be reliably raised and lowered even when the wind blows. The guide wire also accurately guides the ball net and assists in raising and lowering the ball. Furthermore, since the column itself can expand and contract to lower its top, maintenance and inspection work can be carried out more easily. Furthermore, when the upper end of the ball-protecting net protrudes inward to form an eave-like projection as defined in claim 6, even if the ball is subjected to spin and moves as if climbing up the ball-protecting net. The ball is guided to fall securely inside the practice field and is completely prevented from flying out to the outside.

<Examples> The present invention will be specifically described below based on illustrated examples. Reference numeral 1 denotes a ball protection device according to the present invention, which is installed around a flight range of a golf driving range, for example. It goes without saying that the present invention itself is not limited to such golf driving ranges, but can be used to regulate the range of various other types of flying balls or other projectiles. To install this ball protection device 1, first, a suitable foundation 2 made of concrete is provided on the ground, and a telescopic support 3 is erected on this foundation. This support column 3 is made of a high-tensile steel pipe that has been subjected to appropriate anti-corrosion treatment such as hot-dip galvanizing.
In order to have a telescopic structure, for example, three stages of movable columns 31, 32, and 33 are provided in the base fixed column 30 in a retracted state. Furthermore, these supports 3 have a triangular cross section. Below, the constituent members will be explained in detail in order from the base fixed column 30 side. First, the base fixed column 30
As an example, the box is fixed in a rectangular cylindrical buried foundation box 20 having a height approximately in the middle thereof, and is appropriately fixed to the buried foundation box 20 with bolts, etc. Near the upper edge of the box 20, it is supported by a vertical adjustment device 21 whose main component is a bolt. Of course, the embedded foundation box 20 may have a cylindrical shape other than a rectangular tube shape. When installing the pillar 3 using such an embedded foundation box 20, it is sufficient to simply dig a hole large enough to accommodate the embedded foundation box 20 at the installation location and embed it. Of course, in the case of such an embedded type, in addition to filling the inside with concrete C as shown in FIG. 12, an installation method such as providing a concrete foundation or the like and fixing it thereto can also be used. A safety fence 34 is provided to surround the portion of the base fixed column 30 projecting to the ground side, and the column winch unit 4 is first attached using the surrounding area. This strut winch unit 4 includes a drive section 42 equipped with a drive motor _M1 and a speed reducer 41, and a strut winding section 44 comprising two strut winch drums 43 driven by the drive section 42. It consists of Note that two support winch drums 43 are provided for the movable support supports 31 to 33.
This is because the support winch wires 45 are installed at two locations so that the support support winch wires 45 can be wound in a well-balanced manner when installing the support support winch wires 45 for expansion and contraction on the support support winch drum 4.
3 will be indicated as 43a and 43b if it is necessary to distinguish between them, and similarly, the winch wire 45 for the support will be indicated as 45.
They are displayed separately as a and 45b. Furthermore, in addition to such a support winch unit 4, a control panel for raising and lowering the tower is provided using the peripheral surface where the safety fence 34 is provided. The movable columns 31 to 33 are combined with such a base fixed column 30 in a retracted state, and these will be explained below. First, in the present invention, the support column 3 has a triangular cross section, and it is more preferable that it has a truss structure as defined in claim 4. Of course, in this embodiment, the base fixing column 30 also has a truss structure with a triangular cross section. In these truss structures, the vertical members are main truss members a,
A member arranged horizontally so as to connect these members perpendicularly is called a cross truss member b, and a member provided obliquely between them is called a brace truss member c. The base fixed column 30 and each of the movable columns 31 to 33 are slidably combined with each other at the main truss member a, and a column guide shoe 35 is disposed between them. Next, the suspension structure of the strut winch wire 45 that raises and lowers the movable struts 31 to 33 will be described. The strut winch wire 45 acts on the lowermost movable strut 31
5, a strut winch wire 45 acting on the middle movable strut 32, and a strut winch wire 45 acting on the uppermost movable strut 33. First, as shown in FIG. 9, the strut winch wire 45 wound around the strut winch drum 43 is fixed at one end near the upper end of the base fixing strut 30, and is once guided downward to the lowest stage. It is wound around the guide pulley _G1 provided below the movable support column 31, and then reversed upward again, and further wound around the guide pulley _G2 provided at the upper end of the base fixed support column 30, and then reversed downward and used for the support column. It is configured to be wound around a winch drum 43. The support winch wire 45 that acts on the middle movable support support 32 has one end attached to the base fixed support support 32.
The guide pulley G ₃ is fixed at the upper end of the movable column 31 at the lowermost stage and is extended upward.
It is further wound downward, and its tip is fixed to the lower end of the movable column 32 in the middle stage. Similarly, the strut winch wire 45 that acts on the movable strut 33 at the highest stage is pulled out upwards with one end fixed to the movable strut 31 at the lowest stage, and then the guide pulley G provided at the upper end of the movable strut 32 at the middle stage is pulled out. Wind it around ₄ ,
It is guided and reversed downward, and the movable column 33 at the top
The other end is fixed to the lower end of. In addition to such one set of strut winch wires 45a, as for the other set of strut winch wires 45b, only the lowest strut winch wire 45 is temporarily guided laterally by the guide pulley _G5 . It is guided by the guide pulley G ₆ to the other side of the truss with a triangular cross section, and then acts on each of the movable columns 31 to 33 from the bottom to the middle and top tiers based on the same configuration. It can be installed to do so. In addition, as shown in FIG. 16, each movable support 31
33 are each provided with a stopper 36 in order to restrict the upper limit of each other's rise, and are also provided with a locking device 37 for safely maintaining the fully raised state. In terms of design, each support column 3 independently has sufficient rigidity as a tower structure.
However, if necessary to further improve the rigidity, it is also possible to adopt a structure in which the columns 3 are interconnected by sub-beams (not shown). Furthermore, if the supports 3 are interconnected by the upper ends of the supports 3 and the sub-beams as described above, the sub-beams may also be used as necessary, for example, in the middle of the supports 3 to provide a direction inward in the flight direction. A suspension beam 6 is provided in an overhanging manner. A guide wire 7 is stretched between the tip of the suspension beam 6 and the ground (more precisely, between the weight block 8 buried underground). Since the support 3 itself expands and contracts, the guide wire 7 may become loose when used without the support 3 being fully raised. No countermeasures are required. However, if the guide wire 7 is to be actively prevented from loosening, a winding device may be provided at the lower end to wind it up as appropriate. The lifting beam 9 is guided by the guide wire 7.
The lifting beam 9 is constructed so as to slide against the guide wire 7 by means of a holding slider 10 on all the guide wires 7 or on any necessary appropriate guide wire 7. This holding slider 10 is the 13th, 1st
As shown in FIG. 4, a base plate 10a connected to a bracket 9a provided on an elevating beam 9 via a pin joint 9b is used as a supporting member, and a guide pipe 10b is formed perpendicularly in the center of the base plate 10a. A nylon sleeve 10c is fitted inside to improve the sliding condition. In addition, on the back side of this guide pipe 10b, there is a winch wire 16 for a net, which will be described later.
Fix one end of. In addition, when the base plate 10a is installed in the middle of the lifting beam 9, it is connected as a bendable node by a pin joint 9b, but when applied to a corner bent at 90 degrees, it is connected at two or more points. and fix it in a rigid state. Of course, such a holding slider 10
A suitable guide ring or the like is provided as a guide member for the portion of the guide wire 7 where no guide is provided.
In place of this holding slider 10, a holding pulley 10' that grips the guide wire 7 in a slidable manner may be used as shown in FIG. In addition, in the above-mentioned type, when raising and lowering the ball protection net 11, which will be described later, the support 3 is always extended to the maximum extent, and when raising and lowering the ball protection net 11, only the elevating beam 9 is raised and lowered. However, since the pillar 3 moves up and down and expands and contracts, for example, the lifting beam 9 is fixed to the movable pillar 33 at the top of the pillar 3, and the ball protection net 11 It is also possible to make the raising and lowering of the support column 3 take place by extending and contracting the support column 3. Further, below the elevating beam 9, a ball protection net 11 which directly has a ball protection effect is stretched so as to be suspended downward, and each of these ball protection nets 11 is also Guide wire 7
It is configured to be loosely supported via a guide ring 12. In order to guide the ball protection net 11 more actively, for example, a separate guide wire 7a as shown in FIG. The ball protection net 11 may be freely supported via the ball. Of course, in this case, it is expected that the guide wire 7a may loosen as the elevating beam 9 moves up and down, and if the guide wire 7a needs to be kept under tension at all times, as explained above regarding the guide wire 7, the guide wire 7a may be loosened at its lower end. The wire 7a may be wound up so that it is always kept in tension. Furthermore, when the ball protection net 11 is stretched over the lifting beam 9, it is preferable that the upper side of the net be directed inward to form the eave-like projecting portion 11a. Incidentally, such a measure is effective when the golf ball hits the upper part of the ball protection net 11 when the golf ball is spinning.
This is to ensure that the ball is guided inward even in such a situation, since the ball may roll as if climbing on top of the ball and fly out to the outside. This specific method is shown in Figure 18a, for example.
As shown in b and c, it can be taken as appropriate,
For example, as shown in FIG. 18a, the upper edge of the anti-ball net 11 is stretched to cover the inner surface of the lifting beam 9 made of a triangular cross-section truss, or the upper edge of the
As shown in FIGS. 8b and 8c, an eave-like sub-frame 9F is provided at the upper end or lower end of the lifting beam 9 so as to extend horizontally inward, thereby forming an eave-like projecting portion 11a inside. Regarding the relationship between the ball protection net 11 and the support column 3 made of a triangular cross-section truss, as shown in an enlarged view in FIG.
Preferably on the side. This is because, as shown in FIG. 2, even if the net is bent by the wind, contact between the ball protection net 11 and the support 3 can be prevented. Next, a description will be given of the elevating mechanism of the elevating beam 9 that supports the ball protection net 11. This mechanism is moved up and down by the net winch unit 13.
3 is a reducer 14 and a motor as shown in FIG.
It is composed of a driving _section mainly consisting of a winch drum 15 for the net and a winding section mainly consisting of a winch drum 15 for the net. That is, the output shaft of the reducer 14 is directly connected to the main shaft of the net winch drum 15, and the net winch wire 16 is wound around the net winch drum 15. extends upward along the supporting column 3, and is guided by guide rollers 17 provided at the base end and the distal end of the suspension beam 6 so as to be bent in appropriate directions by 90°, and the ends thereof are connected to the lifting beam. Connected to 9. A limit switch 18 is attached to an appropriate position on the support 3 to set the top dead center and bottom dead center of the lifting beam 9. The things that operate the limit switch 18 by touching it include the net winch wire 16 itself,
Utilizes an actuating piece attached to it.
Further, a wind/wind vane 19 is installed above the appropriate pillar, and this detects the surrounding wind condition, and based on this data, the suspension on which the ball protection net 11 is suspended is installed. It is also possible to automatically control the elevation of the beam 6 and the support 3. Of course, it is also possible for the administrator to constantly monitor the data of the wind/wind vane 19 and manually set it.

The specific structure of the ball protection device for a golf driving range or the like according to the present invention has the above-mentioned configuration, and operates as follows. First, in explaining the operating state, a state in which the support column 3 is contracted to its lowest position and the elevating beam 9 has also descended accordingly will be described as a starting state. First, power is supplied to the support winch unit 4 by an appropriate switching operation. In such a case, the motor in the support winch unit 4
_M1 drives the strut winch drum 43 via the speed reducer 41, which winds the strut winch wire 45 appropriately. As the support winch wire 45 is wound up, the support winch wire 45 is acting on the lowermost movable support support 31.
As the wire is wound up, the guide pulley _G1 provided below the lowermost movable strut 31 acts like a movable pulley to move the lowermost movable strut 31 by half the height of the winding stroke of the strut winch wire 45. Movable support post 3
1 will continue to rise. Along with this upward movement, the guide pulley _G3 attached to the lowermost movable column 31 rises, and since the column winch wire 45 that is stretched around it is of a constant length, With this movement, the upper end of the support winch wire 45 rises, thereby causing the middle movable support 32 to rise upward. Under the same action, the reverse position of the support winch wire 45 is raised by the guide pulley _G4 at the upper end of the middle movable support 32, and the uppermost movable support 33 is also raised accordingly. In other words, the winch wire for the prop 4
5, each of the movable columns 31 to 33 simultaneously starts to rise by the same stroke. As described above, if the support winch wire 45 is operated at opposing positions on both sides of the movable support columns 31 to 33, the lifting and lowering operations can be performed more smoothly and in a well-balanced manner. Of course, if the driving of the support winch drum 43 is stopped midway through manual operation or the like as appropriate, the hoisting will stop at that position and the support support 3 can be installed at the desired height. In this state, it is desirable to prevent each of the movable columns 31 to 33 from falling downward by a locking device 37 that utilizes fittings such as pins or a ratchet mechanism. Further, when lowering the strut 3, by reversing the strut winch drum 43 and letting out the strut winch wire 45, each of the movable struts 31 to 33 descends under its own weight and returns to the stored state. If the pillar 3 extending upward in this way is raised along with the lifting beam 9, the ball protection net 11 will be tensioned all at once. The elevating and lowering operations of the net 11 will be described with reference to a state in which the elevating beam 9 accompanied by the ball protection net 11 is descending while the support column 3 is in an extended state. For example, when the ball protection net 11 is sufficiently lowered, the net winch wire 16 wound around the net winch drum 15 is also almost completely unwound, leaving a waste winding. 11, the motor _M2 is started by an appropriate switching operation, its rotation is transmitted to the net winch drum 15 via the reducer 14, and the net winch wire 16 is sequentially wound. . When doing this, the tip of the net winch wire 16 rises, lifting and moving the lifting beam 9 upward. Of course, at this time, since the elevating beam 9 itself is guided by the guide wire 7 whose trajectory can be bent to some extent, it is possible to rise or fall sufficiently even if it does not maintain a completely horizontal state. Also, the ball-prevention nets 11 that are pulled up and stretched are also separated by guide rings 12 at regular intervals.
The wire is guided by the guide wire 7, and the wire is reliably stretched. Furthermore, the ball protection net 11 is stretched below the tip of the suspension beam 6,
Since it is sufficiently far away from the pillars 3, there is no chance of it becoming inadvertently tangled with these pillars, and in this respect as well, the tensioning work can proceed smoothly. When the motor _M2 continues to be driven in this manner, the net winch wire 16 comes into contact with the limit switch 18 for detecting the top dead center at a position where it is completely wound up, and the drive is stopped. Of course, it is not necessary to always tension the ball protection net 11 to the top dead center, and it is also possible to leave it stretched at an appropriate height. In such a tensioned state, even if the ball protection device 1 is exposed to excessive wind force, the ball protection net 11 will not become entangled with the support 3, and the ball protection net 11 can be lowered under strong winds by operating in the opposite direction to the upward movement. It will definitely be done. Furthermore, in strong winds, the truss structure of the pillars 3 allows the wind to pass through them sufficiently, minimizing wind resistance. The above-described embodiment was constructed as one unit in which the ball range was surrounded by a substantially U-shaped planar shape on the golf driving range, but the ball-protection net was further divided into many small units, and these were divided into small units. A desired shape may be obtained by appropriately combining the base numbers. In this case, the height of the ball protection net can be set differently for each small unit.

<<Effects of the Invention>> The present invention has the above-described configuration, and since the pillar 3 itself can be moved up and down, the entire ball protection device 1 can be lowered sufficiently close to the ground, and maintenance and inspection can be carried out. Installation work can be performed extremely easily. By the way, the effect of installing the ball protection device 1 is that the support 3 is independent (the type that does not connect the upper end of the support 3 to the sub-beam).
In this case, the pillar 3 can be installed by simply digging a hole large enough to embed the embedded foundation box 20 that constitutes the foundation 2 of the pillar 3, and the required accuracy of the mutual positional relationship of the adjacent pillars 3 is also met. Since it is lower, it allows for easier and faster installation work.
In addition, if a lifting beam 9 is provided for the suspension beam 6 that projects in an overhanging manner so as to be sufficiently distant from the pillar 3, a ball protection net 11 is attached to the lifting beam 9.
Since the ball net 11 is stretched so as to be suspended, the ball protection net 11 will not become entangled with the support pillar 3 etc. under strong winds, or will not be intermittently stirred into contact with it, and the lifting and lowering operations will always be performed reliably. while significantly reducing damage. This in turn reduces the cost of replacing and repairing the ball protection net 11, and since repair work can be done with the ball protection net 11 lowered, there is no need to work at heights, which also reduces work costs. These functions work synergistically to achieve a significant reduction in maintenance and management costs compared to conventional systems. Furthermore, as defined in claim 1 or 4, when the support column 3 etc. has a truss structure and has a triangular cross section, it is lightweight and has sufficient strength while minimizing wind resistance. The triangular cross section has superior torsional rigidity compared to, for example, a rectangular cross section, and a sufficient strength effect can be obtained with a minimum amount of materials. Further, since the ball protection net 11 is loosely supported with respect to the guide wire 7 via the guide ring 12, the tension state of the ball protection net 11 is properly regulated. Furthermore, in the case of the present invention, especially when using a truss-structured tower structure, sufficient strength can be obtained by itself, so the distance between the pillars can be made sufficiently large, and therefore radio wave interference to the surrounding area can be reduced. Almost never occurs. Furthermore, as defined in claim 6, an eave-like projecting part 1 is provided on the upper part of the ball-prevention net 11.
1a facing inward, this completely prevents spinning golf balls from climbing up the ball protection net 11 and falling to the outside, thereby providing a safe facility. obtain.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing how the ball protection device of the present invention is used in a golf driving range, etc., FIG. 2 is a plan view showing a part of the same on an enlarged scale, FIG. A side view showing an enlarged view of the pillar, Figure 5 is the 4th
A side view showing an enlarged range of the area shown in the figure,
Figure 6 is an enlarged side view of the area shown in Figure 4, Figure 7 is a cross-sectional view schematically showing the broken state taken along the line in Figure 6, and Figure 8 is an enlarged side view of the area shown in Figure 4. Side view showing enlarged range, No. 9
The figure is an explanatory diagram schematically showing the winding state of the winch wire for the strut, Figure 10 is an enlarged perspective view showing the vicinity of the winch unit for the net, and Figure 11 is an enlarged view of the support state of the guide wire at the lower end of the strut. FIG. 12 is a vertical sectional view showing an example of the basic structure, FIG. 13 is a front view showing an enlarged holding slider, and FIG. 14 shows a broken state taken along the line in FIG. FIG. 15 is a perspective view showing another embodiment of the holding state of the lifting beam, and FIG.
Figure 6 is an explanatory diagram schematically showing an example of a mechanism for preventing the movable column from falling, and Figure 17 is a partially enlarged view of the guide wire loosening prevention mechanism provided from the midpoint of the lifting beam to the ground. FIG. 18 is an explanatory view showing various embodiments in which an eave-like projecting portion is formed on the ball-prevention net. 1...Ball protection device, 2...Foundation, 3...Strut, 4
... Winch unit for strut, 6 ... Suspension beam, 7, 7a ... Guide wire, 8 ... Weight block, 9 ... Lifting beam, 9F ... Subframe, 9a ... Bracket, 9b ... Pin joint , 10...Holding slider, 10a...Base plate, 10b...Guide pipe, 10c...Nylon sleeve, 10'...Holding pulley, 11...
Anti-ball net, 11a...Eave-shaped overhang, 12...Guide ring, 13...Winch unit for net, 14...Reducer, 15...Winch drum for net, 16...Winch wire for net, 17
...Guide roller, 18...Limit switch,
19... Wind/wind vane, 20... Embedded foundation box, 21... Vertical adjustment device, 30... Base fixed column, 31, 32, 33... Movable column, 34... Safety fence, 35... Pillar guide show, 36
...Stopper, 37...Lock device, 41...Reducer, 42...Drive section, 43, 43a, 43b...
... Winch drum for prop, 44... Winding part for prop, 45, 45a, 45b... Winch wire for prop, 45, 45, 45... Winch wire for prop, a... Main truss member, b...
Cross truss member, c...Brace truss member, C...Concrete, _G1 to _G6 ...Guide pulley, _M1 , _M2 ...Motor.

Claims (1)

[Scope of Claims] 1. A device that prevents a ball from flying to the outside by using a prop as a part of the support member and extending a ball prevention net, wherein the prop has a plurality of movable props with respect to a base fixed column. It is structured so that it can be expanded and stored sequentially in the upward direction, and each column has a triangular cross section, and the highest movable column supports the lifting beam.
A ball protection device for a golf driving range, etc., characterized in that a ball protection net is suspended from the elevating beam. 2. The ball protection device for a golf driving range or the like according to claim 1, wherein the lifting beam is supported by the movable support, and the lifting beam is suspended by a net winch wire. Device. 3. A ball protection device for a golf driving range or the like according to claim 1 or 2, wherein the elevating beam is suspended by a net winch wire from a suspension beam protruding inward from the center of the pillar. 4. A ball protection device for a golf driving range or the like according to claim 1, 2 or 3, wherein each of the pillars and the elevating beam has a truss structure. 5. A ball protection device for a golf driving range or the like according to claim 1, 2, 3 or 4, wherein the ball protection net is loosely supported on a guide wire via a guide ring. 6. The ball protection device for a golf driving range or the like according to claim 1, 2, 3, 4, or 5, wherein the ball protection net has an eave-like projecting portion such that an upper end thereof faces inward.