JPS5917328Y2 - Volleyball net tension device - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a volleyball net tensioning device.

Traditionally, volleyball net tensioning is accomplished by a wire winder attached to the lower side of the support.

Therefore, the wire winding machine exists as a protrusion on the side of the support, which is extremely dangerous for players who try to pick up the ball that has flown near the support, and there is a risk of injury if the player comes into contact with it. .

Moreover, since the wire is guided to the position of the wire winder attached to the side of the support, the wire is located along the support, which is also dangerous.

Therefore, the present invention was devised to eliminate the dangers caused by the above-mentioned wire winding machine being installed on the outside of the support column. This is a comb-free, extremely clean-cut support that eliminates the elements that could cause injuries to players.The structure consists of a screw shaft that is rotatably attached to the upper part of the length-adjustable support at a fixed position. A movable plate is screwed onto the shaft, a pulley is attached to the movable plate, the wire of the net is introduced into the column via the retractable pulley attached to the upper end of the column, and the end of the wire is passed through the pulley on the movable plate. This feature is characterized in that the section is fixed to the upper end of the support column.

Hereinafter, one embodiment of the present invention will be described based on the drawings.
A is a column whose length can be adjusted and is composed of an outer tube 1 and an inner tube 2, and the inner tube 2 is attached to the outer tube 1 so as to be adjustable up and down.

To explain an example of the mechanism for raising and lowering the inner tube 2, a nut member 4 fixed to the lower end of the inner tube 2 is screwed onto a screw punch 3 that is inserted into the outer tube 1 and rotates at a fixed position. The bevel gear 5 fixed to the lower end is a bevel gear 6 which is horizontally supported with a shaft orthogonal to the screw punch 3.
The shaft 6' of the bevel gear 6 is caused to protrude outside the outer tube 1.

Therefore, when the handle 7 is fitted onto the shaft 6' and rotated, the screw punch 3 is rotated in a fixed position via the bevel gears 6 and 5, and the nut member 4 of the inner tube 2 which is screwed onto the screw punch 3 is rotated. moves up and down to raise and lower the inner tube 2, thereby allowing the column to be adjusted to a predetermined height.

(Inside the upper part of the inner tube 2 of the strut A configured as above)
A tensioning device is provided to tension the wire a' of =a.

The tensioning device consists of a screw that is vertically supported between a bearing 8 that is fitted and fixed to the upper end of the inner tube 2 and a fixed plate 9 that is located below the bearing 8 and fitted and fixed inside the inner tube 2. Shaft 10, screw shaft 10
A movable plate 11 that is screwed into the inner tube 2 and moves up and down inside the inner tube 2. A pulley 13 is rotatably supported on a bearing frame 12 fixed upright on the upper surface of the movable plate 11, and a cap 14 is attached to the upper end of the inner tube 2.
It consists of a retraction pulley 15 attached to the wire a'
is drawn into the inner tube 2 via the pulley 15, guided upward through the pulley 13 on the movable plate 11, and formed into the bearing 8 with a head 16 fixed to the end of the wire a'. It is fixed by being fitted into the engagement step portion 17 that has been formed.

Further, the upper end of the screw shaft 10 passes through the bearing 8 and the cap 14 and projects in the -E direction, and the projecting portion is formed to have a rectangular cross section to form a bundle attachment portion 10'.

Reference numeral 18 denotes a guide rod that allows the movable plate 11 to be stably guided up and down while remaining horizontal, and this guide rod 18 is installed vertically across the bearing 8 and the fixed plate 9.

Further, the aforementioned fixing of the fixing plate 9 is carried out by connecting and integrating both the inner tube 2 and the fixing plate 9 with pins 19.

The operation of the tensioning device configured as described above is as follows: First, when the bundle 7 is fitted into the bundle attachment portion 10' at the upper end of the screw shaft 10 and rotated, the screw shaft 10 rotates in a fixed position.
The movable plate 11 screwed into the wire a' moves up or down along the inner surface of the inner tube 2 while being guided by a guide rod, thereby loosening or tensioning the wire a'.

Moreover, since the wire a' is hung around the pulley 13 on the movable plate 11 and stretched in a U-shape, the wire a' has a length that is twice as long as the amount of movement of the movable plate 11 equipped with the pulley 13. Can relax or tense, and can operate efficiently within a limited range.

As described in detail above, the present invention includes a screw shaft rotatably mounted at a fixed position inside the length-adjustable column, a movable plate screwed onto the screw shaft, and a pulley mounted on the movable plate. The wire of the net was introduced into the column via a retractable pulley attached to the top of the column, and the end of the wire was fixed to the top of the column through the pulley on the movable plate. A movable plate screwed onto the screw shaft can move up or down to relax or tighten the wire.

Furthermore, since the wire is stretched in a U-shape by a pulley on the movable plate, the wire can be relaxed or tensed to twice the length of the movable plate.

Therefore, the limited space within the pillar can be used effectively,
In addition, it is possible to provide a tensioning device that can efficiently tension or loosen the wire, and since the proposed device can be built into the support, there are no protrusions on the outer surface of the support, creating a highly safe support. I can do it.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with Figure 1 being a front view and Figure 2 being a front view.
The figure is an enlarged cross-sectional view showing the height adjustment mechanism of the strut, Figure 3 is an enlarged cross-sectional view showing the tensioning device, and Figure 4 is (4) of Figure 3.
) - (4) A cross-sectional view along the line, Figure 5 is (5) in Figure 3.
- (5) A cross-sectional view along the line, Figure 6 is (6) in Figure 4.
- (6) It is a sectional view taken along line. In the figure A: strut, a: net wire, a': net wire, 10: spiral shaft, 11: movable plate, 13: pulley, 15: retractable pulley.

Claims (1)

[Scope of utility model registration request] A screw shaft is rotatably attached at a fixed position inside the length-adjustable column, a movable plate is screwed onto the screw shaft, a pulley is attached on the movable plate, and the wire of the net is connected to the upper end of the column. A volleyball net tensioning device in which the wire is introduced into the support via a retractable pulley attached to a movable plate, and the end of the wire is fixed to the top of the support through a pulley on a movable plate.