JPS622072Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for simultaneously adjusting the height of a volleyball net or the like and stretching the net.

Conventionally, this type of device was developed using Utility Model 55-87268.
A net support such as that described in the above publication is known. This has two drive shafts, one above the other, one of which is operated to raise and lower the column, and the other drive shaft is operated to stretch the net rope. However, the drive mechanism disclosed therein is difficult to assemble accurately within the tubular support, and the support mechanisms for the bevel gears and each shaft are unstable.
There is a risk that gear meshing and other problems may occur as the gear is subjected to the strong force of the tense netrope.
There are still various points that need to be improved for practical use.

The present invention was developed from the above viewpoints, and is easy to assemble, and despite the tension of the net rope, the net support can be smoothly raised and lowered by rotating the drive shaft with a light force, and the net rope can be tensioned. Moreover, it is an object of the present invention to provide a height adjustment device for a net tensioning support and a net tensioning device which prevent malfunctions due to excessive force acting on various driving parts.

That is, the present invention provides a net tensioning strut consisting of an outer pipe and an inner pipe that fits into the outer pipe so as to be able to move up and down and has a guide sheave for threading the net at the upper end, in which the block body is fixed within the outer pipe. A feed screw shaft and a rotation angle axis are provided by inserting the block body in the vertical direction, and two drive shafts are inserted vertically by inserting the block body in a direction orthogonal to the feed screw shaft and the rotation angle axis. The drive gear provided on one drive shaft is provided at different positions and meshes with a drive nut that is screwed onto the feed screw shaft and rotatably supported within the block body, and the drive gear provided on the other drive shaft is The gear is rotatably supported within the block body and meshed with a hollow gear provided to rotate integrally with the rotation angle shaft, and one end of the drive shaft is fitted with a handle through a handle insertion hole provided in the outer tube. The upper part of the feed screw shaft is fixed to the inner tube, and the upper part of the rotation angle shaft is also provided with a feed screw shaft that protrudes upward through a thrust bearing fixed to the inner tube. The screw shaft is screwed into a fixing nut provided on the locking part support frame that locks the net rope pulled down from the upper end of the inner tube, and serves as a net tensioning device and for adjusting the height of the net tensioning support.

Next, this invention will be explained with reference to illustrated embodiments.

FIG. 1 shows the entire structure of a volleyball net tensioning column to which the height adjustment device of this invention is applied. In the figure, 1 is an inner tube and 2 is an outer tube, both of which are telescopically fitted to a telescope.The lower end of the outer tube 2 is fixed to the floor 3, and the inner tube 1 is raised and lowered to create a volleyball net. The height of the rope 4 is adjustable.

That is, as shown in FIG. 2, the inner tube 1 is fixed to the lower end with a block-shaped thrust bearing 5 and a set bolt (not shown), the upper end of the feed screw shaft 6 is screwed into this thrust bearing 5, and the set screw 7 It is fixed and supported. The feed screw shaft 6 has a length necessary to raise and lower the inner tube 1, has a thread formed over its entire length, and is disposed in the tube axis direction within the outer tube 2 (Fig. 1). .

The feed screw shaft 6 is screwed into a drive nut 9 in a drive unit 8 that is completely fixed to the outer tube 2 with a set bolt (not shown) or the like. As shown in FIG. 3, the drive unit 8 is assembled with a main body 10 having a cylindrical block having a diameter approximately equal to the inner diameter of the outer tube 2. As shown in FIG. That is, a required number of thrust balls 12 are installed in the stepped portion (bottom) of the large diameter portion 11a, which corresponds to the upper half of the hole 11 through which the feed screw shaft 6 passes, which is provided through the main body 10 in the axial direction. A thrust bearing ring 13 is placed on it, a threaded gear 9a with a helix angle of 45° to the right is formed on the outer peripheral surface, and a female thread 9 having the same specifications as the feed screw shaft 6 is formed on the inner peripheral surface.
A drive nut 9 formed by a shape b is placed, and a presser pipe 14 is placed thereon and fixed with a set screw 15, so that the drive nut 9 is installed so that it can only rotate. The feed screw shaft 6 is screwed into the female thread 9b of the drive nut 9 to pass through it. Therefore, by rotating the drive nut 9 in the forward and reverse directions,
The non-rotating feed screw shaft 6 can be raised and lowered.

As shown in FIG. 4, a hollow-structured drive gear 1 that meshes with a screw gear 9a on the outer circumferential surface of a drive nut 9 is a screw gear with a helix angle of 45° to the right.
6 has a thread 16a formed on its inner peripheral surface.
A screw 18 is installed horizontally perpendicularly to the axis of the drive nut 9 and passes through the main body 10 and has a screw 18 on the outer peripheral surface.
It is screwed and supported by a rotatable drive shaft 18 formed by a. The drive shaft 18 passes through a hole 19 that extends through the main body 10 in the diametrical direction (horizontal direction) and has a diameter slightly larger than the outer diameter of the drive gear 16 . Hole 1
9 has a length equivalent to the drive gear 16 left in the center, and both ends thereof are formed as large diameter holes 19a and 19b. The head 18b of the drive shaft 18 is
It is configured as a large-diameter portion that comes into contact with the stepped portion of the large-diameter hole portion 19a via a required number of thrust balls 20. In the figure, 18c is a square hole formed in the head 18b as a handle device, and this is exposed to the outside through a handle insertion hole 21 provided at a corresponding position in the outer tube 2.

On the other hand, a disk-shaped back plate 22 is fixedly attached to the tip of the shaft portion of the drive shaft 18 with a set screw 23, and a ratchet wheel 25, which is sandwiched between linings 24, 24 on both sides, is rotatably mounted inside the back plate 22. A pressure plate 26 is fitted inside the plate so as to be freely movable in the axial direction, and a pressure plate 26 is fitted therein so as to be rotatable and movable in the axial direction. Masatsu clutch A is configured and installed. The pawl 27 that engages with the pawl wheel 25 is the third
As shown in the figure, it is inserted from the upper end side of the main body 10 and is placed in a state where it is constantly pressed by the presser plate spring 28.

Therefore, the handle 70 in FIG. 3B is inserted into the square hole 18c.
When the screw 18a of the drive shaft 18 and the screw gear 9 of the drive nut 9 are rotated clockwise,
Due to the screw movement of the screw 16a of the drive gear 16 which does not rotate (high rotational resistance) because it is engaged with the clutch A, the drive gear 16 moves upward in FIG. push. When the pressing force reaches a certain level, the clutch A connects the drive shaft 18 and the drive gear 16, and both begin to rotate at the same time. As a result, the drive nut 9 is rotated in the forward direction, and the non-rotating feed screw shaft 6 is moved upward in FIG. 3.

Therefore, the inner tube 1 is similarly raised via the thrust bearing 5 to which the upper end of the feed screw shaft 6 is fixed. When the handle stops rotating, the pawl 27 moves to the ratchet wheel 25.
Since the drive gear 16 which is in pressure contact with the ratchet wheel 25 is prevented from reversing, the drive gear 16, which is in pressure contact with the ratchet wheel 25, never moves, and the raised position of the inner tube 1 is reliably maintained, and a separate positioning and fixing mechanism is not required. do not.

Conversely, when the handle is rotated counterclockwise, the screw movement between the screw 18a of the drive shaft 18 and the screw 16a of the drive gear 16 causes the drive gear 16 to separate from the clutch A as shown in FIG. It moves downward until it comes into pressure contact with the end surface of the head 18b of the drive shaft 18, and both begin to rotate in the same direction. As a result,
The drive nut 9 is rotated in the reverse direction, moving the non-rotating feed screw shaft 6 in the downward direction in FIG. 3, and lowering the inner tube 1. In this way, the height of the column can be adjusted and the column can be held in position or released by simply rotating the handle.

Incidentally, FIGS. 5A and 5B show the structure of the upper end of the inner tube 1 to which the netrope tensioning device is applied, divided into a netrope released state and a tensioned state. In the figure, 30 is a fixed guide sheave that is rotatable around a shaft 31, and a tip fitting 32 that is fitted and fixed to the upper end of the inner tube 1.
It is installed at the tip of the In the figure, 32 is a sheave support frame that protrudes and retracts from the upper end of the tip fitting 32, and 34 is a movable guide sheave that is rotatably attached to the upper end of the sheave support frame 33 with a shaft 35.

Further, in the figure, 36 is a parallel width slit formed to a required depth (length) in the axial direction at the upper end of the inner tube 1 on the opposite side from the fixed guide sheave 30;
Reference numeral 7 designates a rope stopper, whose upper end surface is formed into a semicircular shape, and approximately fan-shaped recessed fitting portions 37a, which are wider at the top, are formed on both side surfaces. It is installed so that it can swing freely in the left and right directions and can be moved up and down along the slit 36. At approximately the center of the lower end of the rope stopper 37, a recessed notch 37b is formed to sandwich the lower edge (bottom) of the slit 36 in a direction perpendicular to the recessed fitting part 37a. The net rope 4 is introduced by wrapping it around the upper side of the fixed guide sheave 30, and then wrapping it around the lower side of the movable guide sheave 34, and runs it along the outer surface from the upper end surface of the rope stopper 37, and the concave notch 37b at the lower end and the bottom of the slit 36. It is reintroduced into the inner tube 1 from between the edges and is allowed to hang down within the inner tube 1 for a required length.

The elevating and lowering drive mechanism of the sheave support frame 33 is shown in FIGS. 6A and 6B. That is, a through hole 33a is provided in the lower part of the sheave support frame 33, a cylindrical neck portion 38a of a fixing nut 38 is rotatably fitted into the through hole 33a, a bottom plate 39 is applied from the opposite side, and the hole is fixed to the fixing nut 38 through the seat plate 39. A fixing nut 38 is rotatably attached to the sheave support frame 33 by screwing in a bolt 40. Fixing nut 3
8 is provided with a screw hole 38b passing through it in the vertical direction, into which a long straight feed screw shaft 40 is screwed and passed through. 40a is a stopper block at the upper end of the feed screw shaft 40.

As shown in FIG. 2, the lower end of the feed screw shaft 40 is supported by a thrust bearing 5 so as to be immovable in the axial direction and only rotatable. That is, the lower end of the feed screw shaft 40 is screwed into the stepped joint pipe 41, and the set screw 4
It is fixed at 2. The stepped joint tube 41 is rotatably fitted into a hole penetrated in the axial direction of the inner tube 1 by the thrust bearing 5, and is connected to the tip portion of the thrust bearing 5 protruding from the bottom side via a thrust ball bearing 44. A tube 45 is fitted and fixed with a set screw 46. The joint pipe 45 has a hexagonal hole 45a that has a common center line with the feed screw shaft 40, and a hexagonal shaft (not limited to a hexagonal cross section, however, any rotation angle shaft that can transmit rotational torque is acceptable). ) 47 is fitted and fixed with a set screw 48. In other words, the hexagonal shaft 47 and the feed screw shaft 40 are connected to rotate in the same manner.

As shown in FIG. 3, the hexagonal shaft 47 passes through a hollow gear 50 in the drive unit 8 fixed to the outer tube 2 so as to be able to move up and down. The drive unit 8 is assembled with a main body 10 having a cylindrical block having a diameter approximately equal to the inner diameter of the outer tube 2. That is, the required number of thrust balls 5 are in contact with the stepped portion (top surface portion) of the large diameter portion 51a, which corresponds to the lower half of the hole 51 through which the hexagonal shaft 47 passes, which is provided through the main body 10 in the axial direction.
A screw gear 50a with a helix angle of 45 degrees to the right is formed on the outer peripheral surface, and a hexagonal shaft similar to the hexagonal shaft 47 is formed on the inner peripheral surface. A hollow gear 50 formed with a hole 50b is brought into contact with the holding pipe 54, and a holding pipe 54 is brought into contact with the lower side of the holding pipe 54 and fixed with a set screw 55, so that the hollow gear 50 is installed so that it can only rotate.
The hexagonal shaft 47 is passed through the hexagonal hole 50b of the hollow gear 50, and when the hollow gear 50 is rotated, the hexagonal shaft 47
can be rotated in exactly the same manner, and in turn, the feed screw shaft 40 connected above can be rotated in the same manner.

The mechanism for rotating the hollow gear 50 is as shown in FIG. That is, a drive gear 56 having a hollow structure, which is also a screw gear with a helix angle of 45 degrees to the right, meshes with the screw gear 50a of the hollow gear 50.
has a thread 56a formed on its inner peripheral surface. A screw 58 is provided on the outer circumferential surface of the hollow gear 50 in a horizontal arrangement perpendicular to the axis of the hollow gear 50.
It is screwed and supported by a rotatable drive shaft 58 formed by a. The drive shaft 58 passes through a hole 59 that is passed through the main body 10 horizontally in the diametrical direction and has a diameter slightly larger than the outer diameter of the drive gear 56 . The hole 59 is formed with a length equivalent to the drive gear 56 in the center thereof, and large diameter holes 59a and 59b are formed at both ends thereof. The head 58b of the drive shaft 58 is connected to the large diameter hole 59a through a required number of thrust balls 60.
It is configured as a large-diameter portion that comes into contact with the step portion of the In the figure, 58c is a square hole formed in the head 58b as a handle attachment part, and this is exposed to the outside through a handle insertion hole 61 provided at a corresponding position in the outer tube 2.

On the other hand, a disc-shaped back plate 62 is fixedly attached to the shaft end of the drive shaft 58 with a set screw 63, and a ratchet wheel 65, which is sandwiched between linings 64 on both sides, is rotatably fitted inside the back plate 62. Furthermore, a pressure contact plate 66 is rotatably fitted inside the pressure contact plate 6.
6 constitutes and installs a clutch B that comes into contact with the stepped portion of the large diameter hole 19b in which these are housed. As shown in FIG. 3, the pawl 67 that engages with the ratchet wheel 65 is inserted from the lower end side of the main body 10 and is always pressed by a presser plate spring 68.

Therefore, the handle 70 in FIG. 3B is inserted into the square hole 58c.
When the screw 58a of the drive shaft 58 and the screw 56a of the drive gear 56 are rotated clockwise, the drive gear 56 moves downward in FIG. Press the pressure plate 66. When the pressing force reaches a certain level, the clutch B connects the drive shaft 58 and the drive gear 56, and both begin to rotate at the same time. As a result, the hollow gear 50 is rotated in the normal rotation direction, causing the hexagonal shaft 47 and, by extension, the feed screw shaft 40 to rotate in the same direction, and the sheave support frame 33 and, by extension, to be moved by the screw movement with the non-rotating fixing nut 38. Lower the guide sheave 34 as shown in FIG. 5B, and remove the tip fitting 32.
from there to the inner tube 1 by the required stroke. Therefore, one end of the net rope 4 is clamped and fixed between the lower end of the rope stopper 37 and the lower edge of the slit 36, and is
The net rope 4 is pulled for twice as long to tension the free side of the net rope 4, that is, the side on which the net is stretched, thereby achieving the purpose of tension. Note that the movable guide sheave 34 may be replaced with a simple hook-shaped net rope engagement portion, and in that case, the sheave support frame 33 is formed as a simple engagement portion support frame.

Moreover, when you stop rotating the handle,
Since the claw 67 engages with the ratchet wheel 65 and prevents the ratchet wheel 65 from reversing, the driving gear 56 which is in pressure contact with the ratchet wheel 65 will never move, and the sheave support frame 3
3. The raised position of the movable guide sheave 34 is reliably maintained as it is, and no separate positioning and fixing mechanism is required. Conversely, when rotating the handle counterclockwise, the screw movement between the screw 58a of the drive shaft 58 and the screw 56a of the drive gear 56 causes the drive gear 56 to move away from the clutch B and rotate upward in FIG. The head 58b of the drive shaft 58 comes into pressure contact with the end face of the head 58b of the drive shaft 58, and both begin to rotate at the same time. As a result,
The hollow gear 50 is rotated in the reverse direction, and the hexagonal shaft 47
and the feed screw shaft 40 above it are rotated in the same direction, and the sheave support frame 33 and, by extension, the movable guide sheave 34 are raised as shown in FIG. 5A by screw movement with the non-rotating fixing nut 38. Completely release Nettrope 4. In this way, the net rope 4 can be tensioned, held fixed, or released only by rotating the handle.

According to the present invention, by rotating the two drive shafts forward and backward using the handle, the height of the net tensioning support can be adjusted, and the net can be stretched. Inside, the feed screw shaft for adjusting the strut height, the rotation angle shaft for tensioning the net, and the two drive shafts that drive these are interlocked via drive gears, drive nuts, hollow gears, etc. The blocks are assembled to form one drive unit, and then the above-mentioned members are assembled outside the column to form a drive unit, and then inserted into the outer tube, which is the column, and the block body is inserted into the outer tube. Assembling the drive unit is completed by simply fixing it from the outside with screws, etc., making it easy to assemble the proposed device, and the power generated by the easy forward and reverse rotation of the handle is transmitted through one drive shaft. The height of the strut can be adjusted by being reliably transmitted to the screw shaft, and the net can be stretched by being reliably transmitted to the rotation angle shaft via the other drive shaft. Moreover, at this time, the load on the net is received by the feed screw shaft 6 for raising and lowering the column via the thrust bearing of the inner tube to which the feed screw shaft at the upper part of the rotation angle shaft is screwed, so that the rotation angle shaft is moved upward. There are no problems that can be overcome. In addition, the inside of one block body is hollowed out in a predetermined direction, and the internal space is used to interlock and connect the two drive shafts, their respective interlocking feed screw shafts, and rotation angle shafts. It is not necessary to separately assemble support members to support each member, and the assembly and connection are strong, and it is convenient to handle.

[Brief explanation of the drawing]

Fig. 1 is a front view of a volleyball net tensioning support to which the height adjustment device of this invention is applied, Fig. 2 is an enlarged sectional view of the part in Fig. 1, Fig. 3A is an enlarged sectional view of the middle part of Fig. 1, Figure 3B is a side view of the handle;
4 is a sectional view of FIG. 3, FIGS. 5A and 5B are sectional views showing the netrope in a released state and a tensioned state, and FIG. 6A is an enlarged sectional view of the part in FIG. , FIG. 6B is a sectional view taken along line B-B of FIG. 6A, and FIG.
The figure is a - sectional view of FIG. DESCRIPTION OF SYMBOLS 1... Inner pipe, 2... Outer pipe, 5... Thrust bearing, 6... Feed screw shaft, 8... Drive unit, 9
...Drive nut, 18c...Square hole (handle attachment part), 9a...Screw gear, 16...Drive gear, 1
8... Drive shaft, 18b... Head, 21... Handle insertion hole.

Claims (1)

[Scope of utility model registration request] In a net tensioning strut consisting of an outer pipe and an inner pipe that fits into the outer pipe so as to be able to rise and fall and has a guide sheave for threading the net at its upper end, a block main body is fixed within the outer pipe, and the block main body is The block body is inserted in the vertical direction to provide a feed screw shaft and a rotation angle axis, and the block body is inserted in a direction perpendicular to the feed screw shaft and rotation angle axis to shift the two drive shafts vertically. The drive gear provided on one drive shaft is engaged with a drive nut that is screwed onto the feed screw shaft and rotatably supported within the block body, and the drive gear provided on the other drive shaft is engaged with a drive nut that is rotatably supported within the block body. The drive shaft is rotatably supported within the drive shaft and meshed with a hollow gear provided to rotate integrally with the rotation angle shaft, and a handle can be attached to one end of the drive shaft through a handle insertion hole provided in the outer tube. , the upper part of the feed screw shaft is fixed to the inner pipe, and a feed screw shaft is also provided at the upper part of the rotation angle shaft to protrude upward through a thrust bearing fixed to the inner pipe, and the feed screw shaft is fixed to the inner pipe. A net tensioning device and a height adjustment device for a net tensioning strut which is screwed into a fixing nut provided on a locking part support frame that locks a net rope pulled down from the upper end of a pipe.