JPH0120443B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire elongation absorption mechanism in a wire drive device. More specifically, the present invention relates to a wire elongation absorbing mechanism (hereinafter simply referred to as an absorbing mechanism) that has been improved to absorb only the permanent elongation of the wire without absorbing the elastic elongation of the wire due to overload.

Conventionally, as a remote control system, two wires 51 and 52 are each wired in a tensioned state as shown in FIG. A driven device having a drive device 54 having a pulley 53 wound in a direction, and a movable member 56 which is slidably or rotatably provided on a guide member 55 or the like and to which the other ends of the wires 51 and 52 are locked. The device 57 rotates the pulley 53 in the directions of arrows A and B to wind one of the wires 51 and 52 around the pulley 53 and unwind the other, thereby moving the movable member 56 in the direction of arrow C or A device (for example, a wind regulator) configured to perform reciprocating operation (or rotational operation) in the D direction is known.

However, normally, wires made of stranded metal wires have elastic elongation that returns to their original state when the tension applied to the wire is removed, and permanent elongation that does not return to their original state even when the tension is removed. If the latter permanent elongation occurs, the tension applied to the wire is lost and further play occurs in the wire, making it impossible to accurately transmit the operation of the drive device 54 to the driven device 57. Therefore, recently, in the above operation system, when permanent elongation occurs in the wire, it is possible to absorb the permanent elongation, and when used as a wire drive device, the permanent elongation of the wire is automatically adjusted when the wire is wound up. An absorption mechanism capable of absorbing the amount of water has been proposed (for example, Japanese Patent Application No. 56-19972, Japanese Patent Application No. 56-96985, Japanese Patent Application No. 56-193979 filed by the present applicant, etc.).

The basic structure of these absorption mechanisms is that the pulley 53 in FIG.
It is divided into two parts, the pulley 6 and the second pulley 8, and each has ratchet teeth 1 on the opposing sides.
3 and 14 are engraved on it. This one is the first
It has a function of absorbing permanent elongation of the wire by causing the pulley 6 and the second pulley 8 to rotate relative to each other.

However, when such an absorption mechanism is employed as a wire driving device, if the sliding resistance between the movable member 56 and the guide member 55 becomes temporarily large, or if the movable member 56 touches the stopper 58. Therefore, if the lever 61 is further driven in the direction of arrow B after the first wire 51 has been stopped, that is, after the winding operation of the first wire 51 is completed, the first pulley 6 and the second pulley 8 will rotate relative to each other. If this happens, the first wire 51 (eventually extending to the second wire 52) will undergo excessive elastic elongation, and the engagement between the ratchet teeth 13 and 14 will progress to a state where the stiffness play in each part is absorbed. be. Such excessive elastic elongation of the wire has the disadvantage of causing permanent elongation, and also causes bending and deflection of the rotation shafts of the pulleys 6, 8 and other members, making it difficult to operate the operating system. .

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, it is an object of the present invention to provide a mechanism in which the ratchet teeth do not absorb elastic elongation even if the wire is elastically elongated.

That is, the present invention provides a driving member comprising (a) a casing, (b) a shaft rotatably provided within the casing, and a flange extending radially outward from the shaft and having a notch formed along its outer periphery. and (c) a press that is rotatably provided in the casing so as to be adjacent to the flange and concentrically with the shaft, and that is arranged between the one notch on the first side surface on the flange side. A fan-shaped projection having a protrusion and arranged between the other notches, and an elastic piece adjacent to one side of the fan-shaped protrusion with a gap therebetween are protrudingly provided, and a second elastic piece on the opposite side of the flange is provided. (d) a first pulley having first ratchet teeth near the outer periphery of two side surfaces; (d) rotatably provided within the casing adjacent to the first pulley and concentrically with the axis; The second tooth that can mesh with the ratchet teeth.
a second pulley having ratchet teeth near the outer periphery of the side surface; (e) elastic means for pressing the first pulley and the second pulley together; (f) rotation of the second pulley; (g) both ends of which are respectively locked to the outer peripheries of the first pulley and the second pulley and wound in opposite directions to form substantially one closed loop; (h) when the edge of the other notch comes into contact with the elastic piece and is bent, the pressing protrusion comes into contact with the end of the one notch; The gist of the present invention is a wire elongation absorbing mechanism that is configured to fit between the flange and the first pulley in order to increase the distance between the two.

Note that the term "means for applying a braking force to the rotation of the second pulley" includes any means that resists the torque transmitted to the second pulley when the first pulley is rotated in the direction in which the first and second ratchet teeth are idling. It is. Then, there are those that urge the second pulley in the axial direction to generate a frictional force between the second pulley and the stationary member, and those that apply a torque in the opposite direction to the torque transmitted to the second pulley.

Next, the wire elongation absorption mechanism of the present invention will be explained with reference to the drawings.

Fig. 1 is a longitudinal sectional view showing an embodiment of the mechanism of the present invention, Fig. 2 is a sectional view taken along the line X-X of Fig. 1, and Fig. 3 shows the mechanism of the present invention employed as a wire drive device. FIG. 4 is a schematic perspective view of a wind regulator, and FIG. 4 is a longitudinal sectional view showing another embodiment of the mechanism of the present invention.

In FIG. 1, 1 is a casing consisting of a bottomed cylindrical main body 1a and a cover 1b. A shaft 2 is rotatably provided inside the casing 1. One end 2a of the shaft 2 protrudes outside the casing 1, and is used, for example, as a crank handle (third
It is driven by 61) in the figure. A bottomed cylindrical flange 3 extending radially outward is fixed to the shaft 2 by welding or the like. Shaft 2 and flange 3
constitutes a driving member.

The flange 3 has a fan-shaped cutout 4 and a cutout 5 along its outer periphery as clearly shown in FIG.
is formed.

A first pulley 6 and a second pulley 8 are provided on the outer periphery of the shaft 2 adjacent to the flange 3 so as to be rotatable in that order. 2nd pulley 8
is further provided so as to be movable in the axial direction with respect to the shaft 2 by a gap 9. A wave washer 10 is interposed between the second pulley 8 and the casing 1, so that the second pulley 8 is always pressed toward the first pulley 6, and the first pulley 6 is pressed against the flange 3.
Pressed to the side.

As shown in detail in FIG. 2, an elastic piece 4b and a sector-shaped protrusion 4a that can be engaged with the sector-shaped notch 4 are protruded from the first side surface of the first pulley 6 on the flange 3 side. The elastic piece 4b and the fan-shaped protrusion 4a are lined up with some gap in between, so that when the elastic piece 4b comes into contact with the fan-shaped notch 4 and bends as described later, the elastic piece 4b comes into contact with the fan-shaped protrusion 4a. It is composed of

The first side surface of the first pulley 6 is further provided with a pressing protrusion 7 that comes into contact with the notch 5 of the flange 3 . Between the pressing protrusion 7 and the notch 5, there is a second
As shown in the figure, play is provided in the rotational direction. Further, the end surface of the pressing protrusion 7 is shaped like the notch 5 when the notch 5 and the pressing protrusion 7 come into contact with each other, as will be described later.
It is formed in a tapered shape so that it can easily ride on the pressing protrusion 7. Note that the end surface of the notch 5 may be formed into a tapered shape.

First ratchet teeth 11 and second ratchet teeth 12 are carved on the second side surface 6a of the first pulley 6 opposite to the flange 3 and on the side surface 8a of the second pulley 8 so as to mesh with each other. .

On the outer periphery of the first pulley 6 and the second pulley 8,
Both ends of the two wires 21, 22, which substantially constitute one closed loop, are locked and wound in opposite directions. The direction of wrapping is the first
When the pulley 6 is rotated so that the ratchet teeth engage with the second pulley 8, the first wire 21
The direction is such that the second wire 22 is unwound from the pulley 6 and wound around the second pulley 8.

In this embodiment, a wave washer 10 is used as means for applying a braking force to the rotation of the second pulley.
This applies to the casing 1a. That is, when the first ratchet tooth 11 rotates in the idling direction relative to the second ratchet tooth 12, the second pulley 8 is pressed against the casing 1a via the wave washer 10, and a frictional force is generated. This frictional force then becomes the braking force.

Next, the operation when the wire elongation absorbing mechanism constructed as described above is used as the drive device 54 of the wind regulator shown in FIG. 3 will be explained.

A driven device 57 shown in FIG. 3 has the same configuration as a conventional driven device, and includes a guide member 55 and a movable member 5 slidably provided on the guide member 55.
6, and a stopper 58 for stopping the sliding of the movable member 56.

The mechanism of the present invention exhibits substantially the same effect as the conventional mechanism as long as the movable member 56 slides smoothly.

In other words, when rotating the shaft 2 in the direction of arrow A, which is the direction in which the ratchet teeth 11 and 12 mesh in FIGS. 1 pulley 6 is also rotated in the direction of arrow A. In this case, the notch 5 and the pressing protrusion 7 do not come into contact with each other.
Further, since the ratchet teeth 11 and 12 are in the meshing direction, the second pulley 8 also rotates in the direction of arrow A together with the first pulley 6. The second wire 22 is thus wound around the second pulley 8, the first wire 21 is unwound from the first pulley 6, and the loop of wire circulates in one direction, for example at the movable member 56 in FIG.
is moved in the direction of arrow C. In this case, even if permanent elongation occurs in the wires 21 and 22, it is not absorbed.

Next, when the shaft 2 is rotated in the direction of arrow B, which is the direction in which the ratchet teeth 11 and 12 are idling, the fan-shaped notch 4 of the flange 3 comes into contact with the elastic piece 4b adjacent to the fan-shaped protrusion 4a, causing the elastic piece 4b to Rotate in the direction of arrow B. Along with this, the first pulley 6 also rotates in the direction of arrow B. Therefore, the first wire 21 is wound around the outer periphery of the first pulley 6.

In this case, different effects will be exerted as described below depending on whether or not the wire is permanently elongated.

First, if there is no permanent elongation in the wire, the second pulley 8 will be
As a result, the first pulley 6 and the second pulley 8 rotate together in the direction of arrow B, and the loop of wire circulates in the direction of arrow D. In that case, no further elongation of the wire is absorbed. Furthermore, in this case, the elastic piece 4b rotates the first pulley 6 without being bent.

If permanent elongation has occurred in the wires 21 and 22, the second pulley 8 is connected to the wave washer 10.
It will not rotate immediately due to the braking force such as.

Therefore, only the first pulley 6 rotates in the direction of arrow B. Therefore, the permanent elongation of the wire is absorbed by being wound around the first pulley 6, and the tension corresponding to the braking force is restored to the wire. That is, in the present invention, the tension of the wire can be freely adjusted by adjusting the braking force.

As described below, the mechanism of the present invention works when a suitable tension is maintained in the wire, that is, when no permanent elongation occurs, or after the permanent elongation of the wire is absorbed by the above action.
After the movable member 56 contacts the stopper 58, or if large sliding resistance temporarily occurs between the movable member 56 and the guide member 55, or between the window glass and the sash (not shown), the shaft 2 in the direction of arrow B, it exhibits its original excellent effect.

That is, when the shaft 2 is rotated in the direction of arrow B as described above, the elastic piece 4b is bent and comes into contact with the fan-shaped projection 4a, so that the notch 5 on the opposite side contacts the pressing projection 7 and at the same time The first pulley is pushed toward the second pulley, that is, in the direction of arrow E, and the first pulley 6
and second pulley 8 are both moving in the direction of arrow E. Therefore, the second pulley 8 does not have enough room to move in the axial direction. Further, since the biasing force of the wave washer 10 is large, the ratchet teeth 11 and 12 are strongly meshed, so that the meshing position of the ratchet teeth 11 and 12 does not advance. In other words, when an overload is applied, the notches 5 of the ratchet teeth 11 and 12 ride on the pressing protrusion 7, so that they are strongly engaged and are prevented from absorbing the elastic elongation of the wire.

Note that when the overloaded rotation of the shaft 2 in the direction of arrow B is stopped, the elastic piece 4b returns the fan-shaped notch 4 slightly in the direction of arrow A due to its elasticity, so that the pressing projection 7 is not pressed by the notch 5. will be canceled.

Note that the number of pressing protrusions 7 and notches 5 in the above embodiments is not limited to one each, but may be provided at two or more locations to improve strength and stability of operation.

Further, in the embodiment described above, the first pulley 6 and the second pulley 8 are configured to be movable in the axial direction, and the wave washer 10 presses the second pulley 8 toward the first pulley 6. The first pulley 6 is made movable in the axial direction so that the first pulley 6 is movable in the axial direction, and an elastic force such as a coil spring 25 or a wave washer (not shown) is provided between the first pulley 6 and the flange 3 or between the first pulley 6 and the casing 1. You may insert a member. In that case, the first pulley 6 is always connected to the flange 3 as shown in FIG.
It moves toward the flange 3 only when absorbing the elongation of the wire. However, when excessive tension is applied to the first wire 21 and the elastic piece 4b bends and comes into contact with the fan-shaped protrusion 4a,
The pressing protrusion 7 faces the end surface of the flange 3 and prevents the first pulley 6 from moving toward the flange 3 side. This prevents the meshing of the ratchet teeth 11, 12 from advancing too much, that is, from absorbing the elastic elongation of the wire.

That is, in the present invention, the first pulley 6 and the second
The pulleys 8 are urged to be pressed against each other,
It is only necessary that either the second pulley 8 or the first pulley 6, or both, be movable in the axial direction.

Furthermore, when employing the wire elongation absorption mechanism of the present invention as a drive device for a wind regulator,
As shown in FIG. 4, a conventionally known balance spring 32 is housed in a recess 33 of the second pulley 8,
By locking both ends to the boss 34 of the casing 1 and the inner wall surface of the second pulley 8, the weight of the window glass can be balanced and the operation of raising the window glass becomes easier.

Further, as shown by the two-dot chain line in FIG. 2 or in FIG.
A fan-shaped notch 4 formed in the flange 3 and a fan-shaped projection 4 protruding from the side surface of the first pulley 6.
When the window glass is interposed between the respective side surfaces of the window glass, it is possible to prevent the window glass from sliding down due to the vibrations of the car and to prevent the window glass from being forced open from the outside.

The coil spring 25 and the balance spring 32 correspond to the means for applying a braking force to the rotation of the second pulley in this embodiment.
The coil spring 25 urges the second pulley 8 in the axial direction and generates a frictional force between it and the casing 1a. The balance spring 32 also applies a torque to the second pulley 8 in a direction that prevents it from rotating. Therefore, also in this embodiment, the wires 21, 22
If permanent elongation occurs, the second spring 8 does not rotate immediately due to the braking force, and the elongation absorbing action is performed.

In addition to supporting the first pulley 6 and the second pulley 8 on the shaft 2 as shown in FIG. Main body 1a
Various modifications may be made, such as supporting it on a fixed shaft fixed to the side, or supporting it on a boss (not shown) protruding from the second pulley 8.

As mentioned above, the wire elongation absorption mechanism of the present invention can selectively absorb only the permanent elongation without absorbing the elastic elongation that occurs in the wire, so the wire tension can always be maintained within an appropriate range. It can produce such excellent effects, and its practical value is extremely large.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing an embodiment of the mechanism of the present invention, Fig. 2 is a cross-sectional view taken along the line X-X of Fig. 1 (however, the casing is omitted), and Fig. 3 is a wire-driven mechanism of the present invention. FIG. 4 is a longitudinal sectional view showing another embodiment of the mechanism of the present invention, and FIG. 5 is a schematic perspective view showing a conventional wind regulator. be. Main symbols in the drawing: 1: casing, 2: shaft,
3: flange, 5: notch, 6: first pulley,
7: Pressing protrusion, 8: Second pulley, 10: Wave washer, 11: First ratchet tooth, 12: Second
Ratchet tooth, 21: first wire, 22: second wire.

Claims (1)

[Claims] 1. (a) a casing, (b) a shaft rotatably provided within the casing, and a notch extending radially outward from the shaft and forming at least two cutouts along the outer periphery of the shaft. (c) a drive member that is rotatably provided in the casing adjacent to the flange and concentrically with the shaft, and has one notch on a first side surface on the flange side; a pressing protrusion disposed between the two notches, a fan-shaped protrusion disposed between the other notches, and an elastic piece adjacent to the fan-shaped protrusion with a gap formed on one side of the fan-shaped protrusion; (d) a first pulley having first ratchet teeth near the outer periphery of a second side opposite the flange; (d) rotatably within the casing adjacent the first pulley and concentric with the axis; a second ratchet tooth provided and meshable with the first ratchet tooth;
a second pulley having ratchet teeth near the outer periphery of the side surface; (e) elastic means for pressing the first pulley and the second pulley together; (f) rotation of the second pulley; (g) a means for applying a braking force; (h) when the edge of the other notch comes into contact with the elastic piece and is bent, the pressing protrusion comes into contact with the edge of the one notch; The wire elongation absorbing mechanism is configured to fit between the flange and the first pulley in order to widen the distance between the flange and the first pulley.