JPH066734U - Rotation control device for rotating shaft - Google Patents

Abstract

(57) [Abstract] [Purpose] To simplify the structure of the device for restricting the rotation of the rotation shaft and to reduce the size thereof. [Structure] Two coil springs 3 and 4 having an inner diameter smaller than an outer diameter of the rotating shaft 11a and having the same winding direction (right direction) are provided on the rotating shaft 11a in the axial direction of the rotating shaft 11a. Are fitted at a predetermined interval. The ends 12 of the two coil springs 3 and 4 that are separated from each other are supported by the frame 2. On the other hand, the end portions 13a, 13 facing each other
The b is provided with a pressing means 5 that presses the respective end portions 13a and 13b in the circumferential direction in mutually opposite directions (left and right directions) to expand the inner diameters of the two coil springs 3 and 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for restricting rotation of a rotating shaft.

[0002]

[Prior art]

 As a conventional device of this type, one shown in FIGS. 8 and 9 is known. In this device a, rotating shafts c are arranged on both sides of a frame b, and a rotating side plate d extends obliquely upward from the rotating shaft c. The upper end of the rotating side plate d and the central part of the frame b are connected by a telescopic arm e.

The retractable arm e includes an arm portion f and a rod g. One end of the arm portion f is rotatably connected to the upper end portion of the rotating side plate d 1 and the other end extends toward the center portion of the frame b. Inside the other end of the arm part f, as shown in FIG. 9, a swing piece h is provided via a swing shaft i. The swing piece h is swingable toward the frame b side and the rotary side plate d side, and an opening j is formed in the center thereof.

A projecting piece k is formed above the swinging piece h, and a spring m is arranged between the projecting piece k and the swinging piece h. In the arranged state, the swing piece h is urged toward the frame b by the spring m and swings toward the frame b. Further, a wire n is inserted through the inside of the panel m. This wire n has one end connected to the swing piece h and the other end extending upward. When the wire n is pulled upward, the swing piece h swings to the side of the rotating side plate d against the biasing force of the spring n.

One end of the rod g is rotatably connected to the central portion of the frame b, and the other end of the rod g is inserted into the arm portion f while penetrating the opening j of the swing piece h.

In the device a configured as described above, when the swing piece h is swinging toward the frame b, as shown in FIG. 9, the outer peripheral surface of the rod g is the opening j of the swing piece h. The expansion and contraction of the expandable arm e is stopped by being locked to the inner peripheral edge of the. As a result, the rotation of the rotation shaft c is restricted and the rotation side plate d is fixed at a predetermined angle. On the other hand, when the swinging piece h is swinging toward the rotating side plate d, the inner peripheral edge of the opening j of the swinging piece h separates from the outer peripheral surface of the rod g, so that the rod g is inside the opening j. Can be inserted (shown by a chain double-dashed line in FIG. 9). As a result, the expandable arm e can be expanded and contracted, the restriction of the rotating shaft c is released, and the rotating side plate d is rotated.

In the conventional device a, the upper end of the rotating side plate d and the central portion of the frame b are connected by the expandable arm e, and the expansion and contraction of the expandable arm e is prevented, so that the rotary shaft c is rotated. Rotation is restricted. However, if the upper end of the rotating side plate d and the central part of the frame b are connected by the telescopic arm d, the structure of the device a becomes complicated and the device a is increased in size.

[0008]

[Problems to be solved by the device]

 The present invention has been made to solve such inconvenience, and an object of the present invention is to provide a rotation restricting device for a rotation shaft that simplifies the structure and can be downsized.

[0009]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention provides a rotating shaft with two coil springs having an inner diameter smaller than the outer diameter of the rotating shaft and having the same winding direction. The two coil springs are fitted in a line direction at a predetermined interval, and one end of each of the two coil springs facing each other and each of the end portions separated from each other is supported by the frame and the other remaining Each end part is provided with a pressing means for pressing the end parts in opposite directions in the circumferential direction to expand the inner diameters of the two coil springs.

Further, in the present invention, two coil springs having an inner diameter smaller than an outer diameter of the rotating shaft and winding directions opposite to each other are provided on the rotating shaft in an axial direction of the rotating shaft. The coil springs are fitted with each other at a predetermined interval, and the outer end of one of the two coil springs and the end of the other coil spring that remains inside the one coil spring are supported by the frame. At the inner end of the coil spring and the end of the other coil spring away from the one coil spring, the ends of the two coil springs are pressed in the opposite directions in the circumferential direction to expand the inner diameters of the two coil springs. It is characterized in that a pressing means for operating is provided.

[0011]

[Action]

 According to the rotation restricting device of the rotating shaft of the present invention, two coil springs having an inner diameter smaller than the outer diameter of the rotating shaft and having the same winding direction are provided on the rotating shaft. The coil springs are fitted at a predetermined interval in the axial direction, and one end of each of these coil springs facing each other and each end separated from each other is supported by the frame. Therefore, the rotation shaft is fixed to the frame via the two coil springs, and the rotation is blocked.

In order to rotate the rotating shaft, the other ends of the two coil springs are pressed in opposite directions in the circumferential direction by the pressing means, and the inner diameters of the two coil springs are expanded. The tightening of the rotating shaft is released, and the rotating shaft becomes rotatable.

Further, in the state where the rotation of the rotation shaft is blocked, for example, when a force for unexpectedly rotating the rotation shaft is applied from the outside, the two coil springs move the rotation shaft. Since they are tightened, a large frictional force is generated between the inner peripheral surface of the two coil springs and the outer peripheral surface of the rotating shaft. Therefore, the two coil springs tend to rotate together with the rotating shaft in the rotating direction of the rotating shaft.

However, as described above, the two coil springs have a structure in which the inner diameters of the two coil springs are expanded by pressing the other end portions in opposite directions in the circumferential direction. Therefore, the force for rotating the rotating shaft described above acts on one coil spring to expand its inner diameter and release the tightening of the rotating shaft, but on the other coil spring. On the other hand, the inner diameter is reduced so as to tighten the rotating shaft. As a result, even if a force for inadvertently rotating the rotating shaft is applied from the outside, the rotating shaft is clamped by the other coil spring, and the rotation is reliably prevented.

Further, two coil springs having an inner diameter smaller than the outer diameter of the rotating shaft and winding directions opposite to each other are fitted into the rotating shaft at predetermined intervals in the axial direction of the rotating shaft. Also in this case, since the outer end of one of the two coil springs and the end of the other coil spring that faces the inner side of the other coil spring are supported by the frame, The shaft is fixed to the frame via two coil springs and its rotation is blocked.

In order to rotate the rotating shaft, the inner end of one coil spring and the end of the other coil spring away from one coil spring are pressed by the pressing means in opposite directions in the circumferential direction. The inner diameter of each coil spring expands, and the tightening of the rotating shaft is released, so that the rotating shaft can rotate. In addition, when the force to rotate the rotating shaft is inadvertently applied from the outside while the rotating shaft is prevented from rotating, the above-mentioned two coil springs with the same winding direction are used. The same as when used.

[0017]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a cross-sectional view of a main part of a rotation restricting device for a rotation shaft, which is an example of an embodiment of the present invention, FIG. 2 is a left side view in which a part of FIG. 1 is broken, and FIG. FIG. 4 is a plan view in which a part of FIG.

In FIG. 1, reference numeral 1 indicates a rotation restricting device for a rotating shaft, and the rotation restricting device 1 includes a frame 2, two coil springs 3 and 4, and a pressing means 5. ing.

As shown in FIG. 1, the frame 2 includes a bottom plate 6, and side plates 7 a and 7 b extend upward from left and right side portions of the bottom plate 6, respectively. An opening 8 is formed at the center of each of the side plates 7a and 7b. Support plates 9a and 9b extend in the left-right direction from the upper ends of the side plates 7a and 7b, respectively. As shown in FIG. 3, elongated holes 10a and 10b are formed in the respective central portions of the support plates 9a and 9b so as to be separated from each other in the front-rear direction. Rotating shafts 11a and 11b are arranged below the support plates 9a and 9b, respectively, with their axes oriented in the front-rear direction.

The coil springs 3 and 4 each have an inner diameter smaller than the outer diameters of the rotating shafts 11a and 11b, and have a winding direction to the right. As shown in FIG. 2 and FIG. The shafts 11a are fitted in the front-rear direction so as to be adjacent to each other. In the fitted state, the respective end portions 12a, 12b of the coil springs 3, 4 which are separated from each other extend upward from the upper side portion of the rotating shaft 11a and are fitted in the elongated holes 10a, 10b, respectively. Thereby, the coil springs 3 and 4 are supported by the frame 2.

The end portion 13a of the coil spring 3 adjacent to the coil spring 4 extends obliquely downward to the right through the opening portion 8 from the side portion of the rotating shaft 11a that faces the opening portion 8 and the tip portion thereof. Is folded backwards. On the other hand, the end portion 13b of the coil spring 4 adjacent to the coil spring 3 extends obliquely to the upper right through the opening portion 8 from the side portion facing the opening portion 8 of the rotating shaft 11a, and the tip end portion thereof is directed forward. It is bent. In the coil springs 3 and 4 configured as above, when the end portion 13a is pressed to the left in the circumferential direction in FIG. 1, the inner diameter of the coil spring 3 is expanded, and when the end portion 13b is pressed to the right in the circumferential direction, The inner diameter of the coil spring 4 is expanded.

The pressing means 5 includes pressing plates 14 and 15. As shown in FIG. 1, the pressing plate 14 is rotatably supported by the frame 2 by having notches 16 formed at both ends on one end side fitted in upper portions of front and rear side edges of the opening 8. ing. In the supported state, the end 13b of the coil spring 4 is in contact with the lower surface of the pressing plate 14. On the other hand, the pressing plate 15 is rotatably supported by the frame 2 with notches 17 formed on both sides at one end side being fitted into the lower portions of the front and rear side edges of the opening 8. In the supported state, the end 13a of the coil spring 3 is in contact with the upper surface of the pressing plate 15.

Further, one end of an outer pipe 19 is connected to the upper surface of the pressing plate 14 via a nut 18. At the other end of the outer pipe 19, a pressing member (not shown) that presses the outer pipe 19 downward is provided. A wire 20 is inserted through the outer pipe 19, and one end of the wire 20 penetrates the pressing plate 14 and is connected to the pressing plate 15. At the other end of the wire 20, a lever (not shown) that pulls the wire 20 upward is provided.

The rotation restricting device 1 configured as described above has the coil springs 3, 4 as described above when the ends 12a, 12b of the coil springs 3, 4 are fitted into the elongated holes 10a, 10b. Since the inner diameter of 4 is smaller than the outer diameter of the rotating shaft 11a, the rotating shaft 11a is clamped by the coil springs 3 and 4. Therefore, the rotating shaft 11a is fixed to the frame 2 via the coil springs 3 and 4, and the rotation thereof is blocked.

To rotate the rotating shaft 11a, the outer pipe 19 is pressed downward and the wire 20 is pulled upward. Then, the pressing plate 14 presses the end portion 13b of the coil spring 4 to the right in the circumferential direction, and the pressing plate 15 presses the end portion 13a of the coil spring 3 to the left in the circumferential direction, so that the inner diameters of the coil springs 3 and 4 become smaller. Expand the diameter. As a result, the tightening of the rotating shaft 11a is released, and the rotating shaft 11a becomes rotatable.

Further, in a state in which the rotation of the rotation shaft 11a is blocked, for example, a force that unexpectedly rotates the rotation shaft 11a leftward (or rightward) in FIG. 1 is applied. In this case, since the coil springs 3 and 4 are in a state in which the rotating shaft 11a is tightened, a large frictional force is generated between the inner peripheral surface of the coil springs 3 and 4 and the outer peripheral surface of the rotating shaft 11a. Therefore, the coil springs 3 and 4 tend to rotate together with the rotating shaft 11a in the rotating direction of the rotating shaft 11a.

However, as described above, the coil springs 3 and 4 are configured such that the inner diameters of the coil springs 3 and 4 are expanded by pressing the respective end portions 13a and 13b in opposite directions in the circumferential direction. Therefore, the force for rotating the rotating shaft 11a described above expands the inner diameter of the coil spring 3 (or the coil spring 4) with respect to the coil spring 3 (or the coil spring 4) and releases the tightening of the rotating shaft 11a. However, with respect to the coil spring 4 (or the coil spring 3), the inner diameter of the coil spring 4 (the coil spring 3) is reduced so as to tighten the rotating shaft 11 a. As a result, even if a force to rotate the rotating shaft 11a is applied from the outside carelessly, the rotating shaft 11a is tightened by the coil spring 4 (or the coil spring 3), and the rotation is surely prevented.

Regarding the rotation restricting device 1 provided on the rotating shaft 11b, in FIG. 1, the coil springs 4 and 3 have the end portions 13b and 13a and the coil springs 3 and 4 provided on the rotating shaft 11a. The structure is the same as that of the rotating shaft 11a except that they are provided adjacent to each other in the front-rear direction of the rotating shaft 11b in a state of facing the respective end portions 13a and 13b. The same parts are designated by the same reference numerals and the description thereof will be omitted.

In the rotation restricting device 1 having the above structure, the rotation of the rotating shaft 11a (11b) is restricted by the two coil springs 3 and 4 fitted in the rotating shaft 11a (11b). ing. Therefore, the structure of the device can be simplified and the device can be downsized as compared with the conventional case where the rotation of the rotation shaft is restricted by the telescopic arm.

The present invention is not limited to the above-mentioned embodiments, but can be modified as appropriate without departing from the gist of the present invention. For example, in the above embodiment, two coil springs 3 and 4 having the same winding direction are used, but instead of this, as shown in FIGS. 4 and 5, the winding directions are opposite to each other. It is also possible to use two coil springs 21 and 22.

That is, the coil springs 21 and 22 respectively have a left-handed winding direction and a right-handed winding direction, and as shown in FIG. 5, they are fitted to the rotating shaft 11a so as to be adjacent to each other in the front-rear direction. In the fitted state, the end portion 23a of the coil spring 21 that is separated from the coil spring 22 extends upward from the upper side portion of the rotating shaft 11a and is fitted into the elongated hole 10a. An end portion 24a of the coil spring 21 adjacent to the coil spring 22 extends obliquely upward to the right through the opening portion 8 from a side portion of the rotating shaft 11a that faces the opening portion 8 and a tip portion thereof is bent backward. There is.

On the other hand, the end portion 23b of the coil spring 22 adjacent to the coil spring 21 extends upward from the upper portion of the rotating shaft 11a and is fitted into the elongated hole 10b. An end portion 24b of the coil spring 22 which is separated from the coil spring 21 extends obliquely downward to the right through the opening portion 8 from the side portion facing the opening portion 8 of the rotating shaft 11a, and the tip portion thereof is bent forward. Has been.

Then, similarly to the above embodiment, when the outer pipe 19 is pressed downward and the wire 20 is pulled upward, the pressing plate 14 presses the end portion 24a of the coil spring 21 to the right in the circumferential direction, and The pressing plate 15 presses the end portion 24b of the coil spring 22 to the left in the circumferential direction, and the inner diameters of the coil springs 21 and 22 are expanded. As a result, the tightening of the rotating shaft 11a is released, and the rotating shaft 11a becomes rotatable.

Further, in the above embodiment, the inner diameter of the coil springs 3 and 4 is expanded by pressing the pressing plate 14 downward and pulling the pressing plate 15 upward, but instead of this, As shown in FIG. 6 and FIG. 7, the inner diameters of the coil springs 3 and 4 can be increased by pulling the pressing plates 14 and 15 upward and downward, respectively.

That is, as shown in FIG. 6, the end portion 13 a of the coil spring 3 extends obliquely upward and rightward from the side portion of the rotating shaft 11 a facing the opening portion 8 and abuts against the upper surface of the pressing plate 14. Then, the end portion 13b of the coil spring 4 is extended rightward and downward from the side portion of the rotating shaft 11a facing the opening portion 8 and is brought into contact with the lower surface of the pressing plate 15. When the pressing plates 14 and 15 are pulled in the vertical direction by the wires 20, etc., the end 13a is pressed to the left in the circumferential direction, the inner diameter of the coil spring 3 is expanded, and the end 13b is pressed to the right in the circumferential direction. As a result, the inner diameter of the coil spring 4 is expanded.

Further, in the above-described embodiment, the ends 12a and 12b of the coil springs 3 and 4 that are separated from each other are supported by the frame 2, and the ends 13a and 13b that are adjacent to each other are circumferentially opposite to each other by the pressing means 5. However, instead of this, the coil springs 3 and 4 support adjacent ends 13a and 13b of the coil springs 3 and 4 by the frame 2, and the pressing means 5 presses the separated ends 12a and 12b in the circumferential direction. It is also possible to press in opposite directions.

[0037]

[Effect of device]

 As is apparent from the above description, according to the present invention, the rotation of the rotating shaft is restricted by the two coil springs fitted in the rotating shaft. Therefore, the structure of the device can be simplified and the device can be downsized as compared with the conventional case where the rotation of the rotation shaft is restricted by the telescopic arm.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a rotation restricting device for a rotation shaft, which is an example of an embodiment of the present invention.

FIG. 2 is a left side view in which a part of FIG. 1 is cut away.

FIG. 3 is a plan view in which a part of FIG. 1 is cut away.

FIG. 4 is a sectional view of an essential part of a rotation restricting device for a rotation shaft according to another embodiment of the present invention.

FIG. 5 is a plan view in which a part of FIG. 4 is cut away.

FIG. 6 is a sectional view of an essential part of a rotation restricting device for a rotation shaft according to another embodiment of the present invention.

FIG. 7 is a plan view in which a part of FIG. 6 is cut away.

FIG. 8 is a partially cutaway view of a conventional rotation restricting device for a rotation shaft.

9 is a detailed view of a portion A in FIG.

[Explanation of symbols]

1 ... Rotation regulation device, 11a, 11b ... Rotation shaft, 3, 4,
22 ... Right-handed coil spring, 2 ... Frame, 5 ... Pressing means, 21 ... Left-handed coil spring

Claims (2)

[Scope of utility model registration request] 1. Two coil springs having an inner diameter smaller than the outer diameter of the rotating shaft and having the same winding direction are fitted in the rotating shaft at a predetermined interval in the axial direction of the rotating shaft. In the two coil springs, one end of either one of the end portions facing each other and each of the end portions separated from each other is supported by the frame, and each of the remaining other end portions has the respective end portions. A rotation restricting device for a rotating shaft, comprising pressing means for pressing the portions in opposite directions in the circumferential direction to expand the inner diameters of the two coil springs. 2. A rotating shaft is provided with two coil springs having an inner diameter smaller than an outer diameter of the rotating shaft and having winding directions opposite to each other at a predetermined interval in the axial direction of the rotating shaft. The outer end of one of the two coil springs fitted inside and the end of the remaining other coil spring facing the inner side of the one coil spring are supported by the frame, and the inner side of the one coil spring And an end portion of the other coil spring away from the one coil spring, a pressing means for expanding the inner diameters of the two coil springs by pressing the end portions in opposite directions in the circumferential direction. A rotation regulating device for a rotation shaft, which is provided.