JPS6121502Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a constant torque spring device used, for example, in a cable winding device that allows cables to be paid out and retracted with a constant tension.

Unlike other springs such as wire springs, springs, or leaf springs, this type of constant torque spring has many advantages such as no torque change due to changes in elongation and a large initial load. This type of constant torque spring is normally wound around a wound drum, but if the torque changes due to a change in load or due to deterioration of elasticity over time, the torque will increase. It is necessary to change the situation. To do this, it is necessary to change the winding diameter of the winding drum around which the constant torque spring is wound.

Conventionally, the winding diameter has been changed by replacing the winding drum with a winding drum of a different diameter, but such an operation is complicated, and there are various problems such as the need to prepare winding drums of various diameters.

This invention aims to solve these conventional problems and provide a constant torque spring device that can freely adjust the torque without replacing the winding drum.

That is, the device of this invention is constructed so that the diameter of the drum around which the constant torque spring is wound can be continuously changed and adjusted.

The illustrated embodiment will be described below.

Figures 1 to 5 are diagrams showing the configuration of the constant torque spring device of the present invention combined with the cable winding device A (Figure 6), and Figure 6 shows the configuration of the constant torque spring device of the present invention combined with the cable winding device A (Figure 6). It is a figure which shows the example used to hold H.

Reference numeral 5 denotes a drum around which a cable 6 is wound, and is rotatably supported by a bearing 4 on a support shaft 2 installed on a fixed frame 1. Numeral 3 is a nut for fixing the support shaft 2 to the fixed frame 1. 5' is a flange formed at both ends of the drum 5 for guiding the winding of the cable 6.

7 is a rope guide installed on the fixed frame 1, and the rope 6
It has a passage hole 7H, and a stopper 8 attached to the cable 6 comes into contact with the lower surface. Due to this contact with the stopper 8, the cable 8 is no longer wound around the drum 5.

Reference numeral 10 denotes a constant torque spring winding drum outer plate integrally attached to the flange portion 5' of the winding drum 5 by connecting sleeves 13, 14 and screws 13', 14'. The sleeve 13 also serves as a support shaft for the hinge, as will be described later.

A camshaft 9 is rotatably supported between the winding drum 5 and the outer plate 10, and a cam 12 is attached by a pin 16. The camshaft 16 and the cam 12 are attached by a pin 17. The adjusting arm 18 is rotatably supported on the winding drum 5 and the outer plate 10 by rotation of the adjusting arm 18 .

Reference numeral 11 denotes a two-part constant torque spring winding drum whose upper part constitutes a hinge part and which is rotatably supported by a connecting shaft 13, and is composed of two semi-cylindrical bodies, with a recess formed in the middle. As shown in FIG. 2, a cam 12 is disposed in this recessed space.

21 is a screw screwed into the drum 11 for fixing one end of the constant torque spring 15;
A constant torque spring 15 is wound around this drum 11. This drum corresponds to the second drum.

Reference numeral 20 denotes a plurality of screw holes drilled in the outer periphery of the outer plate 10, and a plurality of screw holes are provided in the circumferential direction.By rotating the arm 18 and screwing a set screw 19 into any of the screw holes 20, the arm can be opened. 18 can be fixed at any position.

Reference numeral 23 denotes a first winding drum on which the constant torque spring 15 is loosely wound, and is attached to a shaft 22 attached to the fixed frame 1 parallel to the support shaft 9.

In the above configuration, when the cable 6 is pulled downward and let out from the drum 5, the second drum 11 rotates counterclockwise, so that the constant torque spring 15 is let out from the first drum 23 and wound around the second drum 11. It's being passed around. At this time, the cable 6 is paid out with a constant torque, but when the cable 6 is released, the cable 6 becomes free and the second drum 11 rotates clockwise due to the winding force of the constant torque spring 15, and the cable 6 is fed out with a constant torque. It will be wound up.

When changing and adjusting the magnitude of the torque in this invention, remove the set screw 19 and move the adjusting arm 18 around the support shaft 9 at an angle of 90 degrees with respect to the position shown in FIG. 1, as shown in FIG. 4, for example. Rotate the setscrews 19 into the corresponding screw holes 20, and then arm 1
Fix 8. Then, the cam 12 also rotates, and the winding diameter of the second drum 11, which is a two-part drum, is greatly changed from the state shown in FIG. 2 to the state shown in FIG. 5. This is because the cam 12 engages with the internal recess of the drum 11 and pushes the drum 11 open, and both halves of the drum 11 rotate around the hinge connecting shaft 13. As the winding diameter increases, the traction force of the cable 6 increases. The amount of this increase or decrease can be freely set depending on the position of the adjustment arm 18.

The cable winding device A incorporating the constant torque spring device of this invention can be applied to, for example, an oil supply device as shown in FIG. The PU is a storage part for a fuel pump, etc., and oil is supplied to an automobile or the like through a fuel nozzle N at the tip of a fuel hose H pulled out from the PU. R is a connector that connects the end of the cable 6 to the refueling hose H. DC is a control/display unit installed above the column M, and D is a fuel supply amount indicator.

In this refueling device, when the refueling nozzle N and the refueling hose H are fed out or returned to their original positions, the refueling hose H is connected to the cable 6 and its indexing force is constant, so that the refueling hose remains at the desired position. It can be kept stationary, making operation extremely easy. Of course, this invention is not only applicable to oil supply devices, but can be implemented to various other mechanical devices.

The present invention is not limited to the configuration shown, and the method for continuously changing and adjusting the winding diameter of the second drum is not limited to a split drum. In the case of a split drum, it is not limited to the type that swings around a hinge, but also a type that displaces in the radial direction or a type that increases and decreases by linearly displacing in the diametrical direction.Furthermore, the drum 11 can be divided into two or more It may be divided into multiple parts.

This idea has been described in detail above, so it is useful when the load is changed, such as when changing the thickness and length of the refueling hose or the size of the refueling nozzle, or when the elasticity of the constant torque spring deteriorates due to aging. If such a problem occurs, the magnitude of the torque can be easily and simply adjusted to the required magnitude as necessary.

[Brief explanation of the drawing]

Fig. 1 is a front view of the present invention and an embodiment, Fig. 2 is a front view partially shown in longitudinal section, and Fig. 3 is a front view of the embodiment of the present invention.
4 is a front view of the drum in different operating states, FIG. 5 is a longitudinal sectional front view of FIG. 4, and FIG. 6 is a front view of a refueling device using the device of this invention. DESCRIPTION OF SYMBOLS 1... Fixed frame, 2... Support shaft, 5... Cable winding drum, 6... Cable, 8... Stopper, 9... Camshaft, 10... Outer plate, 11... Two-part type drum,
12...Cam, 13, 14...Connection shaft, 15...
Constant torque spring, 16, 17... Pin, 18... Adjustment arm, 19... Set screw, 20... Screw hole, 21... Screw, 23... First drum, A...
Cable winding device, N: Refueling nozzle, H: Refueling hose, R: Connector, PU: Storage device for refueling pump, etc.

Claims (1)

[Scope of utility model registration request] A constant torque spring, a first drum around which one end of the constant torque spring is loosely wound, and a second drum having a larger winding diameter than the first drum and around which the other end of the constant torque spring is fixed.
1. A constant torque spring device comprising a drum, wherein the winding diameter of the constant torque spring of the second drum can be continuously changed and adjusted.