JPH0889615A - Protection net spreading device for field and track event - Google Patents

Abstract

PURPOSE: To provide a protection net spreading device for field and track events which can increase the height of its protection net and also is excellent in transportability and housability. CONSTITUTION: Plural casters 21 are fitted to the lower surface of a truck frame 20, and at the same time arms 23 are turnably fitted to the side surface four corners of the frame 20, and ascendable/descendable supports 25 are assembled at the tips of the arms 23. A pole 40 made up of pipes 41-43 that can be drawn out or inserted freely is fitted to the upper surface of the front end portion of the truck frame 20, and the drawing out/insertion of the pipes 41-43 is conducted by means of the winding up/unwinding of wires 55a, 55b by means of a winch 51. A support rod 62 is fixed at the tip of the pipe 43, and from this rod 62, a net frame 67 for hanging a net is hung down by using wires 66a, 66b. The wires 66a, 66b are fixed at the pipe 41 through pulleys 63-64 fitted to the support rod 62, and the net is ascended/descended in linkage with the extension/contraction of the pole 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective net tensioning device for athletics used in athletics such as hammer throwing and disc throwing.

[0002]

2. Description of the Related Art Conventionally, a device of this type has a protective net surrounded by a plurality of frame bands so as to surround a circle for throwing hammers, discs, etc. provided on an athletic field. The net was fixed to the ground with a wire.

[0003]

However, it has been conventionally desired to increase the height of the net (for example, to about 9 m) for the safety of other athletes. On the other hand, since this kind of protective net is not always placed in the stadium, it is always stored in the storage provided in the athletic stadium and taken out from the storage as needed. Those that are highly portable and storable are required.

The present invention has been made in order to meet the above-mentioned requirements, and its purpose is to extend a protective net for athletics which can increase the height of the protective net and is highly portable and storable. To provide a device.

[0005]

In order to achieve the above object, a structural feature of the present invention is to provide a protective net tensioning device for athletics, a trolley frame having a plurality of casters attached to a lower surface, and a plurality of trolley frames. Of the pipes with different thicknesses are coaxially and laid one on top of the other so as to be displaceable in the axial direction, and the bottom pipe is vertically fixed to the bogie frame, and the pipe above the bottom pipe is displaced vertically. It is composed of an expansion and contraction mechanism for expanding and contracting and a support mechanism for suspending and supporting the net downward from the upper end of the uppermost pipe.

Another feature is that the expansion / contraction mechanism is composed of a pole wire for engaging a plurality of pipes to vertically move a pipe above the lowermost pipe, and a winch for winding the pole wire. There is something I did.

Another feature is that the support mechanism is a net frame for locking the upper end of the net, and the net frame is locked at one end of the net frame and engages with a pole to connect the net frame to the pole. It is configured with a wire for a net that is lifted in conjunction with the extension of.

Another feature is that the supporting mechanism connects the upper end of the net at one end and engages with the upper end of the uppermost pipe to guide the net wire downward and to the carriage frame. It consists of a winch that is fixed and winds the wire for the net at the other end.

Another feature is that in the above-mentioned protective net tensioning device for athletics, a fixing mechanism for further fixing the truck frame to the ground is provided on the truck frame.

According to another feature, the pole and the expansion / contraction mechanism in the structural feature of the present invention are a first pole and a first expansion / contraction mechanism, and a plurality of pipes having different thicknesses are coaxial with each other and in the axial direction. The second pole, which is constructed by stacking so that it can be displaced, is rotatably assembled to the bottom pole of the first pole via an arm, and the pipe above the bottom pole of the second pole in the vertical direction. And a second expansion mechanism for expanding and contracting the second pole, and instead of the support mechanism, supports for suspending and supporting the net downward from the upper end portions of the uppermost pipes of the first and second poles. There is a mechanism.

[0011]

In the protective net tensioning device for athletics having the above-mentioned features, if a plurality of pipes are overlapped and contracted, the height of the pole becomes lower and the size of the entire device becomes smaller. Since it can be made smaller, the storability is improved. If the casters are rolled while the plurality of pipes are contracted to reduce the height of the pole, the protective net tensioning device can be easily carried, so that the portability is also improved. Then, while carrying in multiple protective net tensioning devices to the athletic field and surrounding a circle for hammer throwing, disc throwing, etc., if you extend the pole using the expansion mechanism of each protective net tensioning device, it will be supported. Since the net is hung from the upper end of the top pipe of the pole toward the ground by the mechanism, the height of the net surrounding the circle can be increased and the safety of other competitors can be sufficiently ensured. Further, when the protective net stretching device is stored, the device can be easily stored in the storage by reversing the above procedure.

According to another feature, since the expansion / contraction mechanism is composed of the pole wire for expanding / contracting the pole and the winch for winding the pole wire, the structure of the entire apparatus can be simplified.

According to another feature, since the support mechanism is composed of the net frame and the net wire for lifting the frame in conjunction with the extension of the pole, the net is lowered at a lower position before the net is lifted. It can be attached to the net frame with and the net frame can be lifted in conjunction with the extension of the pole, so you can easily stretch the net to a high position.

According to another feature, the support mechanism is composed of a net wire and a winch for winding the net wire. Therefore, when the winch is rotated, the pole is extended. So, you can easily stretch the net to a high position.

According to another feature, since the fixing mechanism for fixing the bogie frame to the ground is provided, the entire apparatus is firmly fixed to the ground and does not move during use.

According to another characteristic, since the second pole can be rotated around the first pole via the arm and the second expansion / contraction mechanism can expand / contract the second pole, the protection according to the other characteristics can be achieved. By using the net tensioning device at the front end of the circle for throwing hammers, discs, etc., only the protective net can be arranged on the side of the bogie frame and diagonally forward of the circle. Therefore, according to this other feature, in addition to the effects of the features of the present invention, it is possible to sufficiently secure the safety of other athletes without hindering the athletes of hammer throwing and discus throwing.

[0017]

【Example】

a. First Embodiment First, a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view showing a state in which a plurality of protective net tensioning devices A for athletics according to the first embodiment are arranged around a circle 10 for throwing hammers or discs in an athletic field. .

As shown in FIGS. 1 to 4, each protective net tensioning device A is provided with a carriage frame 20 formed in a rectangular shape. Casters 21 are attached to the four corners of the lower surface of the carriage frame 20, respectively, and a handle 22 for pushing a hand that extends obliquely rearward in a substantially U shape is fixed to the upper surface of the frame 20 at the lower end. A base of an arm 23 that constitutes a fixing mechanism is rotatably attached to the four corners of the side of the trolley frame 20, and each arm 23 is in the housed state.
It is housed on the side of No. 0 (see FIG. 4) and is rotated outward in the installed state (see FIGS. 1 to 3). A nut 24 is fixed to the tip of each arm 23, and a column 25 is screwed onto the inner periphery of the nut 24 so as to be vertically movable on the outer periphery of the intermediate portion. Prop 25
A pedestal 25a is rotatably attached to the lower end of the column 25, and a lever 25b is attached to the upper end of the column 25 so that the lever 25b can move back and forth at right angles to the column 25. A winch 26 having a built-in ratchet mechanism is fixed to the upper surface of the tip of each arm 23, and a chain 2 hung from the winch 26 through the arm 23 by operating the lever 26a.
6b can be wound up to a desired position and fixed at the same position.

The hook 26c provided at the lower end of the chain 26b is adapted to be hooked on the ring 31a fixed to the upper end of the fixing rod 31 of the anchor device 30 buried in the ground. As shown in FIG. 5, the fixing rod 31 is a sleeve 3 which is hardened with concrete 32 and embedded in the ground.
3, the upper end surface of the sleeve 33 is closed by a lid 34 when the fixing rod 31 is not used. Further, the fixing rod 31 penetrates the intermediate plate 34 fixed on the inner circumference of the intermediate portion of the sleeve 33 so as to be vertically displaceable, and has a stopper 31b at the lower end thereof, so that the upward displacement is the intermediate plate 34. It is designed to be regulated by the contact between the stopper 34 and the stopper 31b.

A pole 40 is erected on the upper surface of the front end of the bogie frame 20. The pole 40 is composed of three pipes 41, 42, 43 each having a length of about 3 m, and the thickness of the pipe 41 at the bottom is the largest and the thickness of the pipe 41 becomes thinner as it becomes the pipes 42, 43 at the top. These pipes 4
1, 42 and 43 are coaxially and overlapped with each other so as to be displaceable in the axial direction, and are vertically fixed to the carriage frame 20 at the lower end of the pipe 41 at the lowermost stage.

An expansion / contraction mechanism 50 for expanding / contracting the upper pipes 42, 43 is attached to these pipes 41, 42, 43. As shown in FIGS. 3 and 6, the expansion / contraction mechanism 50 includes a winch 51 that incorporates an electric motor, and pulleys 52, 53, and 54 that are respectively attached to the upper end portion, the intermediate portion, and the lower end portion of the outer peripheral surface of the pipe 41. Is equipped with. The winch 51 winds or unwinds each one end of the wires 55a and 55b by the operation of the electric motor driven by the electric power supplied to the outlet 51a.
The wire 55a passes through the pulley 52 and the pipe 4 at the other end.
It is fixed to the lower end of 2. The wire 55b is fixed to the lower end of the pipe 42 at the other end via the pulleys 53 and 54. The telescopic mechanism 50 also includes pulleys 56 and 57 fixed to the upper and lower ends of the pipe 42, respectively. These pulleys 56, 57 have wires 58a, 58
b is engaged, and the wires 58a and 58b are fixed to the upper end of the pipe 41 at each one end and to the lower end of the pipe 42 at each other end.

The pole 40 has a pipe 4 at the uppermost stage.
A support mechanism 60 for suspending and supporting the nets 61, 61 downward from the upper end portion of 3 is also attached. The support mechanism 60 has a base end fixed to the upper end of the pipe 43 and a support rod 62 extending forward, and pulleys 63, 64, 65 are fixed to the upper surface of the rod 62. A wire 66a is engaged with the pulleys 63 and 64,
One end of the wire 66a is fixed to the upper end of the pipe 41. A wire 66b is engaged with the pulleys 63 to 65, and one end of the wire 66b is also fixed to the upper end portion of the pipe 41. The wires 66a and 66b hang down from the pulleys 64 and 65, respectively, and the other ends thereof are fixed to the central portions of the elongated rear side 67a and the front side 67b of the trapezoidal net frame 67, respectively. ing. The oblique sides 67c and 67d of the net frame 67 are front and rear sides 67a and 6d.
7b has a predetermined angle, and as shown in FIG. 1, the plurality of protective net tensioning devices A are arranged side by side around the circle 10 so that the frame 67 becomes close to a circle. There is.

A plurality of hooks 67 are laterally arranged at a predetermined interval on the rear side 67a and the front side 67b of the net frame 67.
e and 67f are fixed, and the hook 67
The upper ends of the two nets 61, 61 are engaged with the e, 67f at a plurality of points, respectively. Net 6
The lower end portions of the reference numerals 1 and 61 are also fixed to the fixing rod 71 of the anchor device 70 at appropriate points. This anchor device 70 is also configured similarly to the anchor device 30 described above.

A plurality of such protective net tensioning devices A
Has a control box 80 as an accessory for controlling the operation of the electric motor in the winch 51 of each net device A. Electric power is supplied to the control box 80 from an electric power supply device 81 buried in the ground of an athletic field through an electric cord 82. Further, the control box 80 is the outlet 5 of each protective net extension device A.
An electric cord 83 is also provided for supplying electric power to each 1a.

Next, the operation of the first embodiment constructed as described above will be explained. Each protective net tensioning device A has a pipe 4
2, 43 are inserted into the pipe 41, the pedestal 25a of the support column 25 is lifted above the ground surface, and the arm 2
3 is stored in the side surface of the trolley frame 20, and the net frame 67 is placed on the trolley frame 20 and stored in the storage. Also, the net 61 and the control box 8
0 etc. are also stored in the storage. In this state, each protective net tensioning device A has a low height and is compact, so that the protective net tensioning device A can be stored easily.

When using the protective net tensioning device A,
A predetermined number of protective net tensioning devices A are transported to the vicinity of the circle 10 on the athletic field while rolling the casters 21 with the handle 22, and the net 61 and the control box 8 are provided.
0 is also conveyed near the circle 10. Since the transport of the protective net stretching device A is performed by rolling the casters 21, the transportability of the protective net stretching device A is also good.

Next, after arranging the protective net tensioning devices A so as to surround the circle 10 as shown in FIG. 1, the arm 23 of each protective net tensioning device A is opened to the outside and the lever 25b is rotated. By making the pillar 25 and the pedestal 25
The wheel a of the caster 21 is floated off the ground by lowering a. Then, by operating the lever 26a of the winch 26, the chain 26b and the hook 26c are lowered, the lid 34 of the anchor device 30 is opened, the fixed rod 31 is pulled up, and the hook 26c is hooked on the ring 31a of the fixed rod 31. In this state, the lever 26a is operated to pull up the chain 26b and the fixed rod 31 until the chain 26b is extended. After this pulling up, due to the action of the ratchet mechanism in the winch 26, the chain 26b
Also, the lifted state of the fixed rod 31 is maintained. In this way, the area of the plane connecting the distal ends of the arms 23 is increased as the arms 23 are expanded outward, and the support 2
By lifting the caster 21 by 5 and fixing the chain 26b to the anchor device 30, the bogie frame 20 is firmly fixed to the ground.

Next, each hypotenuse 67 of each net frame 67
c and 67d are connected to each other by a connecting plate 91 and a connecting bolt 92. At this time, the net frame 67 located at the front end is fixed to the adjacent net frame 67 at a predetermined angle by the hinge 93. Thereafter, in order to supply electric power to the electric motor in the winch 51 of each protective net tensioning device A, the electric cord 82 of the control box 80 is connected to the electric power supply device 81 of the athletic stadium, and the electric cord 83 is connected.
Is connected to each outlet 51a of each protective net tensioning device A.

After completion of the electrical connection, for each protective net tensioning device A, the hooks 67e and 67f of the net frame 67 are appropriately placed at the upper end of the nets 61 and 61 on the ground.
Lock each to. In addition, these nets 61, 6
1 locking work, electrical connection work and net frame 6
The connecting work between 7 may be performed in any order. After completion of such work, the electric power in each winch 51 is normally rotated by operating the control box 80 to supply electric power to the outlet 51a of each protective net tensioning device A. As a result, the wire 55a is wound and the wire 55b is unwound.

The winding of the wire 55a and the wire 5
By rewinding 5b, the pipe 42 is pulled up. By pulling up the pipe 42, the wire 58 a pulls up the pipe 43. Then, when the lower end of the pipe 42 reaches near the upper end of the pipe 41, that is, when the pole 40 is stretched to the maximum height (about 9 m), the control box 80 is operated to stop the forward rotation of the electric motor. Let
With the extension of the pole 40, the wires 66a and 66b pull up the net frame 67.
Is hung from the upper end of the pipe 43 toward the ground.
Next, the lower ends of the nets 61, 61 are locked to the fixing rods 71, 71 of the anchor 70. As a result, the circle 10 is surrounded by the plurality of protective net tensioning devices A, and the hammer throwing and disc throwing games can be performed within the circle 10. 7 and 8 show a state in which the net 61 is stretched.

Since the pole 40 is stretched to the high position and the net 61 is stretched in this way, the net 61 can be stretched to the high position by a simple operation, and the safety of other athletes is ensured.

When the protective net stretching device A is to be stored in the storage box after the competition, the control box 80 is operated to reverse the electric motor of the winch 51. By reversing the electric motor, the wire 55b is wound and the wire 55a is unwound, so that the pipe 42 descends and is housed in the pipe 41. Since the wire 58b pulls down the pipe 43 as the pipe 42 descends, the pipe 43 is housed in the pipe 42. The net frame 67 and the nets 61, 61 are also pulled down by the wires 66a, 66b in conjunction with the lowering of the pipe 43. Then, at the time when each of the storages is completed, the control box 80 is operated to stop the reverse rotation of the electric motor.

After this, each hypotenuse 6 of each net frame 67
The connecting plate 91 between the 7c and 67d and the connecting bolt 92 are removed, and the nets 61 and 61 are connected to the hooks 67e and 67f of the net frame 67 and the fixing rod 7 of the anchor 70.
Remove from 1, 71 and close the lid of the anchor device 70.
Next, operate the lever 26a of the winch 26 to operate the chain 26b.
Is removed from the fixed rod 31 of the anchor device 30, and the lid 34 of the anchor device 30 is closed. The lever 25b is rotated to float the support column 25 and the pedestal 25a from the ground so that the carriage frame 20 is supported on the ground surface by the casters 21 and 21, and the arm 23 is stored on the side portion of the carriage frame 20. As a result, the protective net stretching device A is returned to the initial state, so that the device can be easily stored in the storage.

B. Second Embodiment Next, a second embodiment of the present invention will be described. Parts and members having the same functions as those of the first embodiment will be designated by the same reference numerals and the description thereof will be omitted. To do. FIG. 9 is a plan view showing a state in which a plurality of protective net tensioning devices B and C for athletics according to the second embodiment are arranged around a circle 10 for hammering and disc throwing in an athletic field. FIG. 10 is a front view showing a part of the protective net stretching devices B and C which are unfolded and viewed from the inside. The protective net tensioning device B is arranged rearward from substantially the center of the circle 10, and the protective net tensioning device C is arranged at the front open end.

The protective net tensioning devices B and C are also shown in FIGS.
13 and FIGS. 14 to 16, a dolly frame 20 having substantially the same structure as that of the first embodiment and assembled with casters 21, a handle 22 for pushing a hand, an arm 23, a nut 24, a column 25 and a winch 26 is assembled. I have it. The chain 26b of the winch 26 is fixed by an anchor device 30 (not shown) similar to that of the first embodiment. In addition, on the upper surface of the central portion of the bogie frame 20, a pole 40 made up of pipes 41 to 43 similar to that of the above-mentioned embodiment is provided upright. However, in this case, the protective net tensioning device B
In this case, the pipes 41 to 43 are each configured to have a length of about 2.3 m, and in the protective net tensioning device C, the pipes 41 to 43 are
Each 43 is configured to be about 3.0 m.

Further, each of these protective net tensioning devices B,
Also in C, the expansion / contraction mechanism 50 for expanding / contracting the upper pipes 42, 43 is attached to each of the pipes 41, 42, 43. The expansion / contraction mechanism 50 is shown in FIGS. 12, 15 and 1.
As shown in FIG. 7, a manual winch 59 mounted on the lower portion of the pipe 41, and pulleys 52, 54 mounted on the upper and lower ends of the outer peripheral surface of the pipe 41, respectively. The winch 59 winds and unwinds one end of each of the wires 55a and 55b by rotating the rotary lever 59a manually. The wire 55a passes through the pulley 52 and the other end of the lower end of the pipe 42. It is fixed to the section. The wire 55b is fixed to the lower end of the pipe 42 at the other end via the pulley 54. Pipe 4
In order to raise and lower the pipe 43 with respect to the pipe 42 in conjunction with the rise and fall of the pipe 42 with respect to 1,
The pulleys 56, 57 and the wires 58a, 58b are provided in the same manner as in the first embodiment.

A support mechanism 60 for suspending and supporting the nets 61, 61 downward from the upper end of the pipe 43.
Also, similar to the first embodiment, the support rod 62 and the pulley 6 are provided.
3, 64, 65 and wires 66a, 66b. However, the second embodiment does not include the net frame 67 as in the first embodiment, and the weights 68a and 68b are fixed to one ends of the wires 66a and 66b. Further, the other ends of the wires 66a and 66b are connected to a manual winch 69 fixed to the bogie frame 20, and the winch 69 winds or unwinds the wires 66a and 66b by rotating the rotary lever 69a to net 61. , 61 up and down. The upper ends of the nets 61, 61 are adapted to be hooked at hooks provided on the lower surfaces of the weights 68a, 68b at appropriate places, and when the nets 61, 61 are stretched, the nets inside are sanded. The bag 72 is pressed against the ground, and the outer net is tied to an appropriate portion of the truck frame 20 or the pipe 41.

Further, as shown in FIGS. 14 to 16, the protective net tensioning device C of the second embodiment has arms 111, 112, 1 which are rotatably assembled to the pole 40.
Equipped with 13. The arm 111 is rotatably assembled at the base end between the support rod 62 and each tip of the stay 114. The stay 114 is fixed to the upper end of the pipe 43 in parallel with the support rod 62. Arm 112,
The base 113 is fixed at each base end to a rotating rod 117 having upper and lower ends rotatably assembled to the front ends of the stays 115 and 116. The stays 115 and 116 are fixed to the pole 41 at their base ends, and are supported by the support rod 62 and the stay 1.
It is extended in parallel with 14. These arms 111 to
Reference numeral 113 is for rotating the pole 120 composed of the pipes 121 to 123.
The upper end of 3 is fixed and the arms 112, 1
A pipe 121 is fixed to each tip of the side surface 13 by a side surface. Further, the arm 113 is fixed to the stay 116 at a rotating position by a positioning pin 118.

The pole 120 is constructed so that it can be extended and contracted similarly to the pole 40, and has the winch 59 and the pulleys 52, 5 described above.
4 and wires 55a and 58a, winch 131, pulleys 132 and 134, and wires 135a and 13
8a, the pulleys 56, 57 and the wires 55b, 58 described above.
It is adapted to be expanded and contracted by an expansion and contraction mechanism composed of a pulley and a wire (not shown) configured similarly to b. Pipe 1
At the lower end of 21, a nut 14 having the same configuration as the above-mentioned nut 24, support 25, pedestal 25a and lever 25b is provided.
A fixing mechanism for fixing the pole 120 to the ground is also assembled, which is composed of 1, a support 142, a pedestal 142a, and a lever 142b.

Further, the protective net tensioning device C is the pipe 1
Wires 151a and 151b for suspending the nets 61 and 61 from the upper end of 23 are also provided. The weights 152a and 152b similar to those described above are fixed to the respective ends of the wires 151a and 151b. Wire 151
a and 151b are pulleys 153 and 153 provided on the arm 111.
154 and pulleys 155, 64 provided on the stay 114,
It is guided to the pole 40 via 63, and the other end thereof is connected to a manual winch 156 fixed to the bogie frame 20. The winch 156 is also constructed in the same manner as the winch 69, and the wires 151a and 151b are wound and unwound by rotating the rotary lever 156a to raise and lower the nets 61 and 61. The upper ends of the nets 61, 61 are adapted to be hooked at hooks provided on the lower surfaces of the weights 152a, 152b at appropriate places, and when the nets 61, 61 are in a stretched state, the nets inside are sanded. The bag 72 is pressed against the ground, and the outer net is tied to an appropriate portion of the pipe 121 or the arm 113.

Next, the operation of the second embodiment constructed as described above will be explained. Each protective net tension device B is a pipe 4
2, 43 are inserted into the pipe 41 (see the chain double-dashed line in FIG. 11), the pedestal 25a of the support column 25 is lifted above the ground surface, the arm 23 is stored on the side surface of the trolley frame 20, and the wire 66a, 66b to winch 69
It is stored in the storage box in a state that it has been wound up with. In each protective net tensioning device C, the pipes 122, 12 are further
3 is inserted into the pipe 121 (see the chain double-dashed line in FIG. 14), the pedestal 142a of the support column 142 is lifted above the ground surface, and the arms 111 to 113 are stored on the side surface of the trolley frame 20 (S1 in FIG. 16). ), And the wires 151a and 151b are wound in the winch 156 and stored in the storage. In this state, the protective net tensioning devices B and C are low in height and compact in construction, so that the protective net tensioning devices B and C can be stored in the same good condition as in the first embodiment.

Also, when using the protective net stretching devices B and C, a predetermined number of protective net stretching devices B and C can be transported to the vicinity of the circle 10 on the athletic field while rolling the casters 21 with the handle 22. The transportability of the protective net stretching devices B and C is also good.

Next, these protective net tensioning devices B and C
After arranging so as to surround the circle 10 as shown in FIG. 9, as in the case of the above-described first embodiment, the wheel lower end surface of the caster 21 of each protective net tensioning device B, C is floated from the ground and the trolley. The frame 20 is fixed to the anchor device 30. Thereby, also in this case, the bogie frame 20 is firmly fixed to the ground. Further, in the protective net stretching device C, the arm 111 in the S1 state of FIG. 16 is further added.
~ 113 is rotated from S2 state to S3 state, the arm 113 is fixed to the stay 116 by the positioning pin 118, and the pivot 142 and the pedestal 142a are lowered by the pivot operation of the lever 142b to lower the pipe 142 to the ground. Firmly fixed to.

Next, the rotary lever 59a of the winch 59 of each of the protective net tensioning devices B and C is rotated to move the wire 5
5a is wound and the wire 55b is unwound, and the pole 4
Extend 0. The operating principle is the same as that of the first embodiment. Further, in each of the protective net tensioning devices C, the rotary lever 131a of the winch 131 is also simultaneously rotated to wind the wire 135a and the wire 13a.
Unwind 5b and extend pole 120. The rotary lever 69a of the winch 69 of each of the protective net tensioning devices B and C is pivotally operated to rewind the wires 66a and 66b, and the weight 68a,
Lower 68b to the ground surface. Further, in each protective net tensioning device C, the rotary lever 156a of the winch 156 is used.
Is also rotated to rewind the wires 151a and 151b and lower the weights 152a and 152b to the ground surface.

Then, appropriate portions of the nets 61, 61 are hooked on hooks provided on the weights 68a, 68b, 152a, 152b, and then the rotary levers 69a, 156a of the winches 69, 156 are rotated to operate the wires 66a, 66
b, 151a, 151b are wound to form nets 61, 61
Hoist. In this case, each protective net tensioning device B, C
In this case, the nets 61, 61 are made to be evenly lifted while watching the hoisting state of the nets 61, 61 at the respective values. After the lifting of the nets 61, 61 is completed, a sand bag 72 is placed on the lower end of the inner net to fix the lower end, and the lower end of the outer net is fixed to the carriage frame 20.
Alternatively, it is tied to the bottom of the poles 40, 120.

In this way, the pole 40,
Since the net 61 is stretched and the net 61 is stretched, the net 61 can be stretched to a high position by a simple operation, and the safety of other athletes is ensured. Further, according to the device of the second embodiment, the net 61 is stretched by manual operation, so that it can be easily used even in an athletic field where no power source is prepared. Also, circle 1
According to the protective net tensioning device C used at the front end portion of 0, only the protective net can be arranged on the side of the bogie frame 20 and diagonally in front of the circle 10, so that a player who throws a hammer or discus can compete. It can ensure the safety of other athletes without hindering the competition.

When the protective net tensioning devices B and C are to be stored in the storage after the competition, the protective net tensioning devices B and C are returned to their initial states by the operation which is completely opposite to the above-mentioned operation. The devices B and C can be easily stored in the storage.

C. Modifications of First and Second Embodiments In the first and second embodiments, the pole 4 is used.
0,120 to three pipes 41-43, 121-123
However, the poles 40 and 120 may be formed of two pipes or four or more pipes.

Although the winch 51 of the first embodiment has an electric motor built therein, a manual winding mechanism may be provided instead of the motor or together with the motor. Further, the winches 59, 69, 131 and 156 of the second embodiment may be constituted by electric winches. When using an electric winch, a small generator may be brought into the athletic stadium to supply electric power to the electric motor from the generator.

In the first and second embodiments, the winches 51 and 59 are fixed to the pipe 41, respectively. However, the winches 51 and 59 are integrally connected to the pipe 41. For example, the truck frame 20
You may make it fixed to etc. Although the winch 131 is fixed to the pipe 121 in the second embodiment, the winch 59 may be fixed to the arms 112 and 113. Further, in the second embodiment, the winches 69 and 156 are mounted on the carriage frame 20.
It was fixed directly to the winch 69,156
Is fixed to a member (for example, a pipe 41) that is integrally connected to the bogie frame 20, and the bogie frame 2 is indirectly connected.
It may be fixed to 0.

[Brief description of drawings]

FIG. 1 is a plan view showing a usage state of a protective net stretching device according to a first embodiment of the present invention.

FIG. 2 is a front view of the protective net tensioning device showing a state before tensioning the net.

FIG. 3 is a side view of the protective net tensioning device.

FIG. 4 is a plan view of the protective net tensioning device.

FIG. 5 is a cross-sectional view of an anchor device for fixing the protective net tensioning device to the ground.

FIG. 6 is a schematic view for explaining a wire disposition state of the protective net stretching device.

FIG. 7 is a front view of the protective net tensioning device showing a state in which a net is stretched.

FIG. 8 is a side view of the protective net tensioning device.

FIG. 9 is a plan view showing a usage state of the protective net tensioning device according to the second embodiment of the present invention.

FIG. 10 is a front view showing a developed state of a part of the use state of the protective net tensioning device.

FIG. 11 is a front view of a protective net tensioning device that is used except for the front end portion in the use state.

FIG. 12 is a side view of the protective net tensioning device.

FIG. 13 is a plan view of the protective net tensioning device.

FIG. 14 is a front view of the protective net tensioning device which is used at the front end portion in the use state and is in the S3 state of FIG.

FIG. 15 is a side view of the protective net stretching device in the S2 state of FIG.

FIG. 16 is a plan view of the protective net tensioning device.

FIG. 17 is a schematic view for explaining a wire disposition state of the protective net stretching device.

[Explanation of Codes] A, B, C ... Protective net tensioning device, 20 ... Bogie frame, 21 ... Casters, 22 ... Handle, 23 ... Arm, 2
5, 142 ... Prop, 26 ... Winch, 30 ... Anchor device, 31 ... Fixed rod, 40, 120 ... Pole, 41-
43, 121 to 123 ... Pipe, 50 ... Expansion / contraction mechanism, 5
1,59,69,131,156 ... Winches, 52-5
4, 56, 57, 132, 134 ... Pulleys, 55a, 55
b, 58a, 58b, 135a, 138a ... Wire, 6
0 ... Support mechanism, 61 ... Net, 62 ... Support rod, 63
-65,153-155 ... Pulleys, 66a, 66b, 15
1a, 151b ... Wire, 67 ... Net frame, 70
... anchor device, 71 ... fixed rods, 111-113 ... arms.

Claims (6)

[Claims] 1. A trolley frame having a plurality of casters attached to a lower surface thereof, and a plurality of pipes having different thicknesses, which are coaxially and axially displaced from each other, are overlapped with each other, and a pipe at the lowest stage is erected on the trolley frame. A fixed pole, a telescopic mechanism that vertically displaces the pipe above the lowermost stage to expand and contract the pole, and a support mechanism that suspends and supports a net downward from the upper end of the uppermost pipe. A protective net tensioning device for athletics characterized by 2. A telescopic mechanism according to claim 1, wherein a pole wire that engages with the plurality of pipes to vertically move a pipe above the lowermost stage, and a winch that winds up the pole wire. A protective net tensioning device for athletics characterized by being configured with. 3. The support mechanism according to claim 1, wherein a net frame that locks an upper end portion of the net, and a net frame that is locked to the net frame at one end and is engaged with the pole. A protective net tension device for athletics, characterized in that the frame is composed of a net wire that is lifted in conjunction with the extension of the pole. 4. The support mechanism according to claim 1, wherein the upper end portion of the net is connected at one end, and the net wire is guided downward by engaging with the upper end of the uppermost pipe. A protective net tensioning device for athletics, comprising a winch fixed to the bogie frame and winding the net wire at the other end. 5. The protective net tensioning device for athletics according to claim 1, wherein a fixing mechanism for fixing the bogie frame to the ground is provided on the bogie frame. Protective net tensioning device. 6. A bogie frame having a plurality of casters attached to a lower surface thereof and a plurality of pipes having different thicknesses, which are coaxially and axially displaced from each other, are superposed on each other, and the pipe at the lowest stage is erected on the bogie frame. The fixed first pole, the first expansion / contraction mechanism for vertically expanding and contracting the pipe above the lowermost stage of the first pole to expand and contract the first pole, and the plurality of pipes having different thicknesses are coaxial with each other. A second pole in which the lowermost pipe is rotatably assembled to the lowermost pipe of the first pole via an arm, and is arranged so as to be displaceable in the axial direction. A second extension mechanism that displaces the pipe in the vertical direction to extend and retract the second pole, and a support mechanism that suspends and supports the net downward from the upper end portions of the uppermost pipes of the first and second poles. Was Protective net stretched device for athletics, wherein the door.