JP2022010137A - Extension device of return spring for opening/closing device and its extension work method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extension device of a return spring for an opening/closing device and its extension work method which are capable of easily and quickly performing work for extending the length in the coil axial direction of the return spring even when the return spring is wound and fastened and arranged on a rotary shaft of the opening/closing device.

SOLUTION: A return spring 20 is a coil spring for assisting in rotation of a rotary shaft 7 that brings an opening/closing body into opening/closing movement when the opening/closing body is in opening movement by a return spring force accumulated by winding and fastening. One end of the return spring 20 in the longitudinal direction is connected to an immovable member 18 via a flange member 21, a bracket 8, or the like, and the other end is connected to the rotary shaft 7. An extension device 30 has a coupling member 32, a load applying member 33, and a body 31 connecting them, the coupling member 32 movable with respect to the body 31 is coupled to the rotary shaft 7, a load for increasing the coil axial length of the return spring 20 is applied to the load applying member 33, and the load causes the coil axial length of the wound return spring 20 to be extended.

SELECTED DRAWING: Figure 10

COPYRIGHT: (C)2022,JPO&INPIT

Description

In the present invention, among the forward and reverse rotations of the rotation shaft for opening and closing the opening and closing body such as a shutter curtain, the rotation when the opening and closing body opens and moves is assisted by the return spring force accumulated by the winding tightening. It is related to the extension device of the return spring for the opening / closing device used to extend the return spring by the spring to obtain the original return spring force and the extension working method thereof, for example, the return for the opening / closing device such as the oversliding door device. It can be used for springs.

The following Patent Document 1 discloses an oversliding door device which is an opening / closing device for opening / closing an opening such as an entrance / exit by a shutter curtain which is an opening / closing body. This oversliding door device is provided with a rotation shaft that rotates forward and reverse to open and close the shutter curtain, and a return spring by a coil spring is wound around the outer circumference of the rotation shaft, and the length of the return spring is arranged. One end in the longitudinal direction is connected to the immovable member, and the other end is connected to the rotating shaft, and the return spring force accumulated by the winding of the return spring opens and moves the shutter curtain. It is at least part of the rotational force of the rotating shaft.

Japanese Unexamined Patent Publication No. 2012-26131

As described above, in order to make the return spring force of the return spring at least a part of the rotational force of the rotating shaft for opening and moving the shutter curtain, the return spring is wound at the time of construction work of the oversliding door device or the like. Work is done. When this work is performed, the return springs, which are coil springs, come into contact with each other of the coil wire portions arranged in the axial direction of the rotation axis, and according to this, the return spring force opens and moves the shutter curtain. When it becomes at least a part of the rotational force of the rotating shaft, the return spring force has a loss due to contact, so that the original return spring force cannot be obtained.

For this reason, conventionally, after winding the return spring, the operator manually performs an extension work for increasing the axial length of the coil, which is the axial length of the rotating shaft in the return spring. Since the coil wires of the return springs that are in contact with each other are separated from each other and the return springs at this time are wound and tightened, this extension work requires a large extension force, and therefore a lot of labor is required. You have to take the time to do this work.

An object of the present invention is that even if a return spring is wound and arranged around a rotary shaft of a switchgear, the work of extending the coil axial length of the return spring can be easily and quickly performed. It is here to provide a spring extension device.

The extension device for the return spring for the opening / closing device according to the present invention is wound around the outer circumference of a rotating shaft that rotates forward / reverse in order to open / close the opening / closing body of the opening / closing device, and one end in the length direction is an immovable member. The other end of the coil spring is connected to the rotary shaft, and the return spring force accumulated by winding tightens the rotary force of the rotary shaft to open and move the open / close body. A return spring extension device for an opening / closing device used to extend the coil axial length of a return spring that is at least a part of the rotary shaft, wherein the rotation is at one end of the rotation shaft or the return spring. A coupling member that is immovably coupled in the axial direction of the shaft, is coupled to the coupling member, is engaged with the other end of the return spring, and is engaged with the other end of the return spring. It is characterized by including a load applying member that applies a load in a direction of increasing the length in the coil axial direction.

As described above, the extension device for the return spring for the opening / closing device according to the present invention is a coupling member that is immovably coupled to the one end of the rotary shaft or the return spring in the axial direction of the rotary shaft, and the coupling member. Provided with a load applying member that is engaged with the other end of the return spring and that applies a load to the other end in a direction that increases the coil axial length of the return spring. Therefore, after the coupling member is immovably coupled to one end of the rotating shaft or the return spring in the axial direction of the rotating shaft, the other end is engaged with the other end of the return spring. By applying a load to the end of the return spring in the direction of increasing the coil axial length of the return spring, the coil axial length of the return spring can be increased and the return springs are in contact with each other. The wire portions can be separated from each other, so that the work for increasing the coil axial length of the wound return spring can be easily and quickly performed.

In the extension device for the return spring for the opening / closing device according to the present invention, applying a load for increasing the coil axial length of the return spring to the load applying member may be performed manually by the operator. Alternatively, a drive device using an electric motor, a hydraulic cylinder, or the like may be connected to the load-applying member, and the drive may be performed by the drive force from the drive device.

Further, the extension device for the return spring for the opening / closing device according to the present invention can be applied to a return spring in which the return spring force accumulated by winding is the total rotational force of the rotating shaft for opening and moving the opening / closing body. It can also be applied to a return spring that is a part of the rotational force of the rotating shaft. When the extension device of the return spring for an opening / closing device according to the present invention is applied to a return spring that is a part of the rotational force of the rotating shaft, the return spring force of the return spring becomes an auxiliary force, and this auxiliary force is applied to a human. When an operating force or a driving force from a driving device such as an electric motor is applied, the rotating shaft rotates and the opening / closing body opens and moves. The return spring extension device for a switchgear according to the present invention can also be applied to a return spring used in such a switchgear.

Further, in the present invention, the connecting member and the load applying member, which are connected to each other, may be connected via the main body of the extension device of the switchgear return spring.

When the coupling member and the load applying member are connected via the main body of the extension device of the return spring for the switchgear in this way, the coupling member and the load applying member in the axial direction of the rotating shaft are connected to the main body. It is preferable to provide an adjusting means for adjusting the size of the interval between the spaces.

According to this, since the size of the distance between the coupling member and the load applying member can be adjusted by the adjusting means, the coil axial length, which is the axial length of the rotating shaft, is different from each other. As for the return spring, the extension device for the return spring for the opening / closing device according to the present invention can be applied.

Further, when the main body is provided with the adjusting means for adjusting the size of the distance between the coupling member and the load applying member in this way, it is preferable to provide both the rough adjusting means and the fine adjusting means on the main body. ..

According to this, the distance between the coupling member and the load applying member can be made close to a predetermined size in a short time by the coarse adjustment means, and the coupling member and the load application can be applied by the fine adjustment means. The distance between the members can be finely and accurately set.

Further, in order to provide the rough adjusting means on the main body, the main body is configured to include, for example, a first main body member and a second main body member, and the rough adjusting means is provided on the rotating shaft with respect to the first main body member. A plurality of locked portions formed in the axial direction of the rotating shaft on the second main body member that is movable in the axial direction, and a second main body member provided on the first main body member in the axial direction of the rotating shaft. It may be provided with a locking member that can be sequentially locked to a plurality of locked portions by moving to.

According to this, by moving the second main body member in the axial direction of the rotation axis with respect to the first main body member, the locking member provided on the first main body member is transferred to the second main body member in the axial direction of the rotation axis. By sequentially locking each of the plurality of locked portions formed in the above, the length dimension of the main body in the axial direction of the rotating shaft can be adjusted in a plurality of steps. The interval between them can be roughly adjusted.

Further, in order to provide the fine adjustment means in the main body, for example, the fine adjustment means includes a female screw member provided with a female screw hole and a male screw member in which a male screw is screwed into the female screw hole of the female screw member. Of the female screw member and the male screw member, when one is rotated, the other may move and the length dimension of the main body in the axial direction of the rotation axis may be changed by a screw mechanism.

According to this, the length dimension of the main body in the axial direction of the rotating shaft can be finely adjusted by the screw mechanism.

Further, rough adjusting means are provided in the middle of the main body in the axial direction of the rotating shaft, two of the fine adjusting means are provided at both ends of the main body in the axial direction, and these fine adjusting means constitute the main body. When the main body member is rotated in one direction, the length dimension of the main body in the axial direction of the rotating shaft becomes large, and when the main body member is rotated in the direction opposite to the one direction, the main body in the axial direction of the rotating shaft is increased. It may be based on a right-handed screw mechanism and a left-handed screw mechanism that reduce the length dimension of.

According to this, when the main body member is rotated in one direction, the length dimension of the main body in the axial direction of the rotating shaft becomes large, and when the main body member is rotated in the direction opposite to the one direction, the length dimension of the main body is increased in the axial direction of the rotating shaft. Since the length dimension of the main body becomes smaller, the length dimension of the main body can be increased or decreased in order to finely adjust the distance between the connecting member and the load applying member by selecting the rotation direction of the main body member. You can easily make fine adjustments.

Further, regarding the load applying member provided in the extension device of the return spring for the opening / closing device according to the present invention, as an example, the load applying member is attached to a connecting portion provided in the middle of the load applying member in the length direction. , A rod-shaped member rotatably connected to the main body, and one end of the rod-shaped load-bearing member as an engaging portion engaged with the other end of the return spring, and also a load. The other end of the applying member is a load acting part that applies a load to the load applying member, and the distance between the connecting part and the engaging part is smaller than the distance between the connecting part and the load acting part. You may.

According to this, since the distance between the connecting part and the engaging part is smaller than the distance between the connecting part and the load acting part, the load applied to the load acting part is a large load due to the principle of the lever. And is transmitted to the engaging portion, so that the coil axial length of the wound return spring is sufficiently extended to the other end of the return spring with which the engaging portion is engaged. It will be possible to apply the large load required for this.

As can be seen from the above description, the load applied to the load acting portion may be a load manually operated by an operator or a load from a drive device such as an electric motor or a hydraulic cylinder.

Further, in the present invention, the other end of the return spring is provided with a flange member connected to the return spring, and the flange member is provided with an engaged portion into which the load applying member is inserted and engaged. By inserting and engaging the load applying member with the engaged portion, the load applying member may be engaged with the other end of the return spring.

Further, the engaged portion of the flange member may be used for inserting and engaging the winding tightening tool used for winding the return spring.

According to this, the engaged portion of the flange member for inserting and engaging the load applying member is provided in advance on the flange member for inserting and engaging the winding tool used for winding and engaging the return spring. Therefore, even if the flange member is not provided with a special portion for inserting and engaging the load applying member, the load applying member can be inserted and engaged with the flange member by using the engaged portion. Become.

The switchgear extension device for a switchgear according to the present invention described above is applicable to any switchgear as long as it is a switchgear in which a return spring by a coil spring is wound and wound around the outer circumference of a rotary shaft. This switchgear may be an oversliding door device, or a shutter device for windows, doorways, etc. that can be freely wound around a winding shaft whose rotation axis is a shutter curtain that is a switchgear. But it may be. Further, the opening / closing body may be a panel type in which a plurality of panels are connected in the opening / closing movement direction, or a slat type in which a plurality of slats are connected in the opening / closing movement direction. A bar type in which bar members made of a plurality of pipes or the like having a lateral direction in the length direction are continuously provided in the opening / closing movement direction may be used, or a sheet type made of sheets may be used, or these. Among the opening / closing body constituent members, those formed by a composite of a plurality of types of opening / closing body constituent members may be used.

According to the present invention, even if the return spring is wound and arranged on the rotating shaft of the switchgear, it is possible to easily and quickly perform the work of extending the coil axial length of the return spring.

FIG. 1 is a schematic perspective view of an oversliding door device which is an opening / closing device using a return spring to which an extension device according to an embodiment of the present invention is applied. FIG. 2 is a partially enlarged front view of FIG. 1, which is a front view showing a portion where a return spring is arranged. FIG. 3 is a front view showing a return spring before being wound. FIG. 4 is a front view showing a return spring after being wound. FIG. 5 is a front view showing the entire extension device according to the embodiment of the present invention. FIG. 6 is a plan view showing the entire extension device of FIG. FIG. 7 is a normal cross-sectional view showing a rough adjusting means provided in the main body of the stretching device. FIG. 8 is a side view showing a connecting member provided in the extension device. FIG. 9 shows that the length dimension of the main body can be adjusted by the rough adjustment means and the fine adjustment means provided in the main body of the extension device, and that the coupling member and the load applying member can rotate with respect to the main body. It is the same figure as FIG. 5 which shows that it becomes. FIG. 10 is a front view showing an operation for increasing the coil axial length of the return spring by the extension device. FIG. 11 is a diagram showing a case where the coupling member is immovably coupled to the rotating shaft in the axial direction of the rotating shaft.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 shows an opening / closing device using a return spring to which an extension device for a return spring for an opening / closing device according to an embodiment of the present invention is applied, and the switchgear is used for a building such as a warehouse. It is an oversliding door device installed at the doorway. In FIG. 1, the shutter curtain 1 which is the opening / closing body of the oversliding door device is a panel type formed by connecting a plurality of panels 2 in the vertical direction which is the opening / closing movement direction of the shutter curtain 1. The panels 2 that are vertically adjacent to each other are rotatably connected to each other by a hinge 3. On both sides of the shutter curtain 1 in the width direction, guide rollers 5 are arranged in a state where the guide rollers 5 project in the width direction of the shutter curtain 1 via the bar member 4 at the connecting portion between the panels 2, and these guide rollers 5 are arranged. , It is inserted into the guide groove of the pair of left and right guide rails 6. Each guide rail 6 is connected via a first portion 6A having a vertical component and extending in the vertical direction and a second portion 6B curved to the upper end of the first portion 6A, and is connected in the thickness direction of the shutter curtain 1. It consists of a third portion 6C extending in the anteroposterior direction with or without a vertical component.

Therefore, in the shutter curtain 1, each guide roller 5 is guided by a pair of left and right guide rails 6 to open and close according to the shape of these guide rails 6, and each guide roller 5 is shown in the figure. As shown in 1, when the first portion 6A of the pair of left and right guide rails 6 is reached, the doorway of the building formed between these first portions 6A is closed by the shutter curtain 1. Further, when each of the guide rollers 5 reaches the second portion 6B and the third portion 6C, the shutter curtain 1 opens the doorway.

A rotary shaft 7 is horizontally arranged above the doorway, and two take-up drums 10 are attached to both ends of the rotary shaft 7 in the axial direction, which are rotatably supported by the brackets 8 and 9. A drive string-shaped member 11 having a wire or the like whose upper end is connected to the take-up drum 10 is freely wound around these take-up drums 10, and the lower end of these drive string-shaped members 11 is a shutter. It is connected to the lower end of the curtain 1. Of the two take-up drums 10, a rotating member 12 such as a sprocket wheel is coupled and integrated to one of the take-up drums 10, and an endless string-shaped member for interlocking with a chain or the like hung around the rotating member 12. 13 is also hung around the rotating member 14. Since the rotating member 15 such as a pulley on which the endless string-shaped member 16 for operation is hung is coupled and integrated with the rotating member 14, a person operates the endless string-shaped member 16 for operation to rotate the rotating member. 15 is rotated in the forward and reverse directions, and this rotation is transmitted to the rotating member 14, the interlocking endless string-shaped member 13, and the rotating member 12, and when the winding drum 10 and the rotating shaft 7 rotate in the forward and reverse directions, they are driven by the winding drum 10. The shutter curtain 1 is guided by the guide rail 6 to open and close by winding and unwinding the string-shaped member 11.

A return spring 20 by a coil spring is wound around the outer periphery of the rotating shaft 7 that rotates forward and reverse to move the shutter curtain 1 to open and close, and the return spring 20 is in the length direction of the coil axis. One end is connected to the bracket 8 which is an immovable member, and the other end is connected to the rotating shaft 7. When the return spring 20 wound and arranged around the outer periphery of the rotary shaft 7 is wound in this way, the return spring force is accumulated in the return spring 20, and is therefore shown in FIG. 1, for example. As described above, when the shutter curtain 1 has reached the fully closed position, the work of a person rotating the rotation shaft 7 by operating the operationless string-shaped member 16 to open and move the shutter curtain 1 upward is this rotation. The rotation of the shaft 7 is assisted by the return spring force of the return spring 20.

When a person operates the endless string-shaped member 16 for operation in the reverse manner to the above operation, the shutter curtain 1 that has been opened and moved upward closes and moves downward, and when the shutter curtain 1 performs this closing movement, the rotation shaft 7 moves. Since the shutter curtain 1 rotates in the opposite direction to the opening movement, the return spring force is accumulated again in the return spring 20.

The over-sliding door device described above is a manual operation type in which the rotating shaft 7 rotates in the forward and reverse directions and the shutter curtain 1 opens and closes when a person operates the endless string-shaped member 16 for operation. The return spring extension device for an opening / closing device according to an embodiment of the present invention, which will be described later, can also be applied to a return spring arranged on a rotating shaft that rotates forward and reverse by a driving force from a driving device such as an electric motor. .. Further, the extension device for the return spring for the switchgear according to the embodiment of the present invention is a balance type in which the weight of the shutter curtain is balanced by a balance weight so that the shutter curtain can be opened and closed more easily than manually. It can also be applied to oversliding door devices.

The rotary shaft 7 shown in FIG. 1 is composed of two left and right rotary shaft members 7A and 7B connected by a joint member 17, and each of these rotary shaft members 7A and 7B is rotated by brackets 8 and 9. It is freely supported, and a take-up drum 10 and a return spring 20 are arranged on each of the rotary shaft members 7A and 7B.

FIG. 2 shows an enlarged view of the rotary shaft member 7A and the take-up drum 10 and the return spring 20 arranged on the rotary shaft member 7A among the rotary shaft members 7A and 7B. In No. 2, an immovable member 18 such as a beam which is arranged above the entrance / exit of the building and to which the brackets 8 and 9 are attached is shown by a two-dot chain line. Further, in FIG. 3, the return spring 20 is further enlarged and shown. As shown in FIG. 3, flange members 21 are provided at both ends in the coil axial direction of the return spring 20 which is a coil spring wound around the outer periphery of the rotary shaft member 7A constituting the rotary shaft 7. , 22 are arranged, and the flange members 21 and 22 are provided with insertion portions 21A and 22A inserted inside the return spring 20. Of these insertion portions 21A and 22A, a hole 21B is formed in the insertion portion 21A, and one of the bent ends 20A of the return spring 20 is inserted and locked in the hole 21B, and the insertion portion 22A is inserted. A hole 22B is also formed in the hole 22B, and the other bent end portion 20B of the return spring 20 is inserted and locked in the hole 22B. As a result, the two flange members 21 and 22 are connected to the return spring 20.

As shown in FIGS. 2 and 3, one of the two flange members 21 and 22, one of the flange members 21 is fastened to the bracket 8 with a fastener 23 using bolts and nuts. Therefore, one end in the length direction of the return spring 20, which is the axial direction of the rotating shaft 7, is connected to the immovable member 18 such as the above-mentioned beam via the flange member 21 and the bracket 8. Further, on the other flange member 22, bolts 24 serving as set screws are screwed inward from the outer peripheral surface of the flange member 22 and arranged, and a plurality of bolts are provided in the circumferential direction of the flange member 22. The flange member 22 is connected to the rotary shaft member 7A by the rotation operation of the 24 for tightening and the tip of these bolts 24 strongly abuts on the rotary shaft member 7A, so that the length of the return spring 20 is long. The other end in the direction is connected to the rotary shaft member 7A, which is a constituent member of the rotary shaft 7, via the flange member 22.

2 and 3 show a return spring 20 before the winding operation for generating the return spring force described above is performed. At this time, since the return spring 20 is a coil spring, the coil wire portions 20C arranged in the axial direction of the rotating shaft 7 are separated from each other in the axial direction of the rotating shaft 7, in other words, in the coil axial direction. There is.

When the return spring 20 is wound and tightened, the bolt 24, which is a set screw, is loosened, and then, as shown in FIG. 3, a plurality of bolts 24 are formed on the outer peripheral surface of the flange member 22 at equal intervals. An operator sequentially inserts and engages the tip of the bar-shaped winding tool 26 with the engaged portion 25 formed by a hole or a recess, and by operating the winding tool 26, the flange member 22 is engaged with the rotary shaft member 7A. The return spring 20 is wound by rotating it to the center, and after this winding, the bolt 24 is tightened to perform the flange member 22 and the end of the return spring 20 connected to the flange member 22. The portion is connected to the rotary shaft member 7A.

FIG. 4 shows the return spring 20 wound in this way, and the coil wire portions 20C of the return spring 20 at this time are in contact with each other, and the coil diameter is reduced by the winding. As the number of turns increases, the coil axial length of the return spring 20 increases.

As shown in FIG. 1, the winding work of the return spring 20 is performed when the oversliding door device is installed in a building such as a warehouse and the shutter curtain 1 is lowered to the fully closed position. .. As for the winding amount of the return spring 20 at this time, even if the shutter curtain 1 reaches the fully open position, the return spring force remains in the return spring 20, and the shutter curtain 1 is lowered by its own weight due to the remaining return spring force. Not set to a large winding amount.

Therefore, the winding work performed on the return spring 20 is performed with a large winding force, and a large contact force is generated in each coil wire portion 20C of the return spring 20. In this way, when a large contact force is generated in each coil wire portion 20C of the return spring 20, the shutter curtain 1 is opened and moved upward by using the return spring force of the return spring 20 as an auxiliary force as described above. If so, the large contact force hinders the respective coil wire portions 20C from shifting and rotating in the circumferential direction of the rotary shaft member 7A, which is the direction in which the return spring 20 is loosened. Therefore, the return spring 20 It is not possible to generate the original proper return spring force, and it becomes difficult to open and move the shutter curtain 1 upward as a predetermined value.

Therefore, in order to allow the return spring 20 to generate the original proper return spring force, the coil axial length of the wound return spring 20 is extended and the coil wire portion in contact with the return spring 20 is extended. In order to perform the work of separating the 20Cs from each other, the extension device 30 according to the embodiment of the present invention shown in FIGS. 5 and 6 is used. FIG. 5 is an overall front view of the extension device 30, and FIG. 6 is an overall plan view of the extension device 30. In the following, a case where the extension device 30 is used for the return spring 20 shown in FIG. 3 will be described. However, by inverting the extension device 30 left and right, the extension device 30 is arranged symmetrically in the axial direction of the rotation shaft 7. It can be used for the two return springs 20 of FIG.

As shown in FIGS. 5 and 6, the extension device 30 is connected to a main body 31 having a length in the length direction of the rotating shaft 7 and one end of the main body 31 in the length direction. It includes a coupling member 32 and a load-applying member 33 connected to the other end of the main body 31 in the length direction. Further, the main body 31 is configured to include a first main body member 34 and a second main body member 35, each of which has a length in the axial direction of the rotating shaft 7, and in the present embodiment, the first main body The member 34 is made of a large-diameter pipe material, the second main body member 35 is made of a small-diameter pipe material, and a part of the second main body member 35 is slidably inserted inside the first main body member 34. As a result, one of these main body members 34 and 35 is movable in the axial direction of the rotating shaft 7 with respect to the other, and therefore, the length dimension of the main body 31 and the connecting member 32 The distance between the load applying member 33 and the load applying member 33 can be adjusted. Further, a gripping member 36 for the operator to grip the main body 31 is attached to the outer periphery of the first main body member 34.

A nut 37, which is a female screw member provided with a female screw hole, is connected to the end of the first main body member 34 on the opposite side of the second main body member 35, and becomes a male screw member in the female screw hole of the nut 37. By screwing the male screw of the bolt shaft 38, a part of the bolt shaft 38 is inserted into the nut 37 and the first main body member 34. A bifurcated bracket 39 is rotatably connected to the end of the bolt shaft 38 protruding from the nut 37 about a pin 39A, and the above-mentioned coupling member 32 is connected to the bracket 39 via a rod-shaped extension member 40. Is attached.

FIG. 8 shows a side view of the coupling member 32. As can be seen from FIGS. 5 and 8, the coupling member 32 formed of the plate material has an opening 32A opened in a direction orthogonal to the axial direction of the rotating shaft 7, as shown in FIG. In the back of the opening 32A, a semicircular or substantially semicircular coupling notch 32B that is continuous with the opening 32A and has a width dimension smaller than that of the opening 32A is provided. A lid member 41 is rotatably attached to the coupling member 32 around the central shaft 41A, and the lid member 41 rotates around the central shaft 41A to open the opening 32A of the coupling member 32. The lid member 41, which was opened and closed and rotated by its own weight around the central shaft 41A, closed the opening 32A of the lid member 41 when the stop portion 41B provided on the lid member 41 came into contact with the coupling member 32. Maintain the state.

As shown in FIG. 8, the width dimension of the coupling chip 32B provided on the coupling member 32 is slightly larger than the diameter dimension of the rotating shaft 7.

As shown in FIGS. 5 and 6, a nut 45 which is a female screw member provided with a female screw hole at an end portion of the second main body member 35 on the opposite side of the first main body member 34. Is connected, and the male screw of the bolt shaft 46, which is a male screw member, is screwed into the female screw hole of the nut 45, so that a part of the bolt shaft 46 is inserted into the nut 45 and the second main body member 35. ing. A bifurcated bracket 47 is rotatably connected to the end of the bolt shaft 46 protruding from the nut 45 around a pin 47A, and the above-mentioned load applying member 33 which is a rod-shaped member is connected to the bracket 47. Is attached, and the attachment of the load applying member 33 to the bolt shaft 46 by the bracket 47 is performed at a position in the middle of the load applying member 33 in the length direction. The location where the bracket 47 is arranged is a connecting portion 48 between the bolt shaft 46 and the load applying member 33 by the bracket 47.

One end of the load applying member 33 in the length direction is a portion that can be inserted and engaged with the engaged portion 25 of the flange member 22 connected to the end of the return spring 20 shown in FIG. This is an engaging portion 33A capable of applying a load from the load applying member 33 to the engaged portion 25, and the other end portion is for the operator to apply a load to the load applying member 33. It is a load acting portion 33B. In the present embodiment, the load acting portion 33B is formed by attaching a member having a large diameter to the outer periphery of the load applying member 33 so that the operator can easily grip the load acting portion 33B.

Further, as shown in FIG. 5, the distance between the connecting portion 48 and the engaging portion 33A is L1, and the distance between the connecting portion 48 and the load acting portion 33B is L2. The interval L1 is smaller than the interval L2.

As shown in FIGS. 5 and 6, a holding member 50 is fixedly provided to the first main body member 34 on the outer periphery of the end portion of the first main body member 34 opposite to the second main body member 35. As shown in FIG. 7, the holding member 50 is held by a shaft 51 rotatably coupled to the holding member 50, and the locking member 52 is centered on the shaft 51. It is rotatable. A torsion coil spring 53 is wound around the outer periphery of the shaft 51, one end 53A of the torsion coil spring 53 abuts on the locking member 52, and the other end 53B is coupled and fixed to the holding member 50. Since it is locked to the shaft 51, the locking member 52 is always elastically urged to the right in FIG. 7 by the spring force of the torsion coil spring 53 around the shaft 51. One end of the locking member 52 in the length direction of the main body 31 is a locking portion 52A pressed toward the second main body member 35 by this elastic urging, and the other end is a work. The locking member 52 is a pressing portion 52B for rotating the locking member 52 to the left in FIG. 7 against the spring force of the torsion coil spring 53 around the shaft 51.

The locking portion 52A of the locking member 52 can be locked to the second main body member 35 at a position facing the locking member 52 arranged by the holding member 50 on the first main body member 34 as described above. A locked portion 35A that can be disengaged is formed, and the locked portion 35A that is a recess, a hole, or the like formed in the second main body member 35 is provided in the axial direction of the rotating shaft 7. A plurality of second main body members 35 are provided at equal intervals in the length direction.

Therefore, after the operator presses the pressing portion 52B of the locking member 52 and rotates the locking member 52 to the left in FIG. 7 with respect to the shaft 51, the worker presses the locking member 52 with respect to the first main body member 34. By moving the second main body member 35 in the length direction of the main body 31, which is the axial direction of the rotating shaft 7, and releasing the pressing of the pressing portion 52B, a plurality of locking portions 52A of the locking member 52 are covered. By locking to one of the locked portions 35A of the locking portions 35A, the length dimension of the main body 31 is changed. Since a plurality of locked portions 35A are provided at equal intervals in the length direction of the second main body member 35, which is also the length direction of the main body 31, the second main body member 35 is used as the first main body member 34. On the other hand, by moving the rotating shaft 7 in the axial direction, the locking portions 52A of the locking member 52 can be sequentially locked to the plurality of locked portions 35A, whereby the length dimension of the main body 31 can be determined. In other words, the size of the distance between the coupling member 32 and the load applying member 33 in the axial direction of the rotating shaft 7 can be roughly adjusted by the distance between the locked portions 35A in a plurality of steps.

Therefore, in the present embodiment, the locking member 52 arranged on the first main body member 34 and the locked portions 35A provided on the second main body member 35 are in the axial direction of the rotating shaft 7. Therefore, a rough adjusting means 60 for roughly adjusting the size of the distance between the coupling member 32 and the load applying member 33 in the length direction of the main body 31 in a plurality of stages is configured.

Further, in the present embodiment, the bolt shafts 38 and 46 shown in FIGS. 5 and 6 are also members constituting the main body 31, similarly to the first and second main body members 34 and 35. Of these bolt shafts 38 and 46, the bolt shaft 38 has a left-handed male screw formed on the outer periphery of the bolt shaft 38, and the above-mentioned nut 37 into which the bolt shaft 38 is screwed is also a female screw. Since the hole is a female left-handed screw hole, the main body 31 is provided with a left-handed screw mechanism 61. Further, in the bolt shaft 46, the male screw formed on the outer periphery of the bolt shaft 46 is a right-handed screw, and the female screw hole of the above-mentioned nut 45 into which the bolt shaft 46 is screwed is also a female right-handed screw hole. Therefore, the main body 31 is also provided with a right-handed screw mechanism 62.

Therefore, the gripping member provided on the first main body member 34 in a state where the connecting member 32 and the load applying member 33 arranged at both ends in the length direction of the main body 31 are prevented from rotating around the main body 31. The first main body member 34 of the main body 31 and the second main body member 35 connected to the first main body member 34 by the rough adjusting means 60 by the hand holding the 36 are connected in one direction about the axis of the main body 31. When rotated to, the nuts 37 and 45, which are female screw members, also rotate in one direction with respect to the bolt shafts 38 and 46, which are male screw members, and the bolt shafts 38 and 46 are fed to the shaft of the rotary shaft 7. In order to move outward in the length direction of the main body 31, which is the direction, the left-hand thread mechanism 61 and the right-hand thread mechanism 62 increase the length dimension of the main body 31, which is the axial length of the rotating shaft 7, and the coupling member. The distance between the 32 and the load applying member 33 can be increased. Further, when the first main body member 34 and the second main body member 35 are rotated in the opposite directions about the axis of the main body 31, the nuts 37 and 45 also rotate in the opposite directions, and the bolt shafts 38 and 46 are fed. Since it moves inward in the length direction of the main body 31 by the action, the length dimension of the main body 31 is reduced by the left-hand thread mechanism 61 and the right-hand thread mechanism 62, and the distance between the coupling member 32 and the load applying member 33 is reduced. Can be made smaller.

Therefore, since the length dimension of the main body 31 can be finely adjusted by the left-hand thread mechanism 61 and the right-hand thread mechanism 62, these left-hand thread mechanism 61 and right-hand thread mechanism 62 are in the axial direction of the rotating shaft 7. Therefore, in order to finely adjust the size of the distance between the coupling member 32 in the length direction of the main body 31 and the load applying member 33, the fine adjustment means 63 provided in the main body 31 is provided. ing.

Further, in the present embodiment, the coarse adjustment means 60 is provided in the middle of the rotary shaft 7 in the main body 31 in the axial direction, and two fine adjustment means are provided at both ends of the rotary shaft 7 in the main body 31 in the axial direction. 63 will be provided.

Further, in the extension device 30 according to the present embodiment, as shown in FIG. 9, the above-mentioned coupling member 32 is rotatable about the pin 39A of the bracket 39 with respect to the main body 31. Further, the load applying member 33 is also rotatable about the pin 47A of the bracket 47 with respect to the main body 31.

Next, as described with reference to FIG. 3, the coil axial length of the return spring 20 which is wound by the operation of the bar-shaped winding tool 26 and is arranged on the outer periphery of the rotating shaft 7 is extended according to the present embodiment. The work for extending by the device 30, that is, the work for increasing the coil axial length will be described. At this time, as described in FIG. 2 and the like, one end of the return spring 20 has a flange member 21 connected to the one end connected to the immovable member 18 via the bracket 8. Therefore, it is connected to the immovable member 18. Further, the other end of the return spring 20 is connected to the rotating shaft 7 because the flange member 22 connected to the end is connected to the rotating shaft 7 by a bolt 24 which is a set screw.

In order to extend the coil axial length of the return spring 20 wound around the outer circumference of the rotating shaft 7 by the extension device 30 according to the present embodiment, first, the length dimension of the main body 31 of the extension device 30 is extended. Is set by the rough adjusting means 60 to a dimension slightly larger than the length dimension of the entire return spring 20 including the two flange members 21 and 22, as shown in FIG. Next, the lid member 41 that is rotatable about the central shaft 41A is opened and rotated with respect to the coupling member 32, and the rotation shaft 7 is inserted from the opening 32A formed in the coupling member 32. As shown in FIG. 8, the rotating shaft 7 is fitted into the inside of the coupling missing portion 32B of the coupling member 32 in a loose state. After performing this loose fitting work, the lid member 41 rotates about the central shaft 41A by its own weight to close the opening 32A of the coupling member 32, and the rotating shaft 7 closes the coupling gap 32B and the opening. It is prevented from getting out of 32A.

After that, as shown in FIG. 10, by shifting and moving the main body 31 in the length direction of the main body 31, the posture of the connecting member 32 formed of the plate material is changed to the pin 39A of the bracket 39. Centered and tilted in a direction orthogonal to the axial direction of the rotation axis 7. As a result, as shown in FIG. 11, the two corner portions 32C of the coupling missing portion 32B which are separated in the axial direction of the rotating shaft 7 and which are also separated in the radial direction of the rotating shaft 7. , 32D abut on the rotating shaft 7. As a result, the coupling member 32 provided in the extension device 30 is immovably coupled to the rotation shaft 7 in which the return spring 20 is arranged in the axial direction of the rotation shaft 7.

At this time, the engaging portion 33A at the tip of the load applying member 33 provided in the extension device 30 is inserted into the engaged portion 25 of the flange member 22 connected to the end of the return spring 20. Match it. After that, the main body 31 is rotated in one direction or the opposite direction around the axis of the main body 31 by the gripping member 36 attached to the main body 31, thereby forming the left-hand thread mechanism 61 described above. The length dimension of the main body 31 is finely adjusted by the two fine adjustment means 63 by the right-hand screw mechanism 62, and the load applying member 33 is attached to the main body 31 and the rotating shaft 7 as shown in FIG. It shall be a right angle or a substantially right angle.

Next, the bolt 24, which is connected to the flange member 22 as a set screw, is loosened. As a result, the return spring 20 that is wound has an expansion force that increases the coil axial length due to the spring repulsive force. Therefore, the load acting portion 33B provided at the rear end portion of the load applying member 33 is provided. The return spring 20 is prevented from expanding by the operator applying an operating force that opposes this expansion force. Further, even by this prevention, it is possible to prevent the flange member 22 from rotating about the rotation shaft 7 due to the unwinding force of the return spring 20, and the winding state of the return spring 20 can be maintained.

After that, the operator exerts an operating force on the load acting portion 33B of the load applying member 33 to rotate the load acting portion 33B toward the connecting member 32 about the pin 47A of the bracket 47. As a result, the load applying member 33 is tilted with respect to the main body 31 and the rotating shaft 7 as shown by the two-point chain line in FIG. 10, and is also in the length direction of the main body 31 of the extension device 30. Since the connecting member 32 provided at one end is immovably coupled to the rotating shaft 7 in the axial direction of the rotating shaft 7, the engaging portion 32A of the load applying member 33 to the flange member 22 The return spring 20 to which the above-mentioned operating force is applied to the engaged portion 25 of the above is extended with a large coil axial length while maintaining the wound tightening state, whereby the return spring 20 is stretched. The coil wire portions 20C that are aligned in the axial direction of the rotating shaft 7 and are in contact with each other are separated from each other in the axial direction of the rotating shaft 7. After that, the flange member 22 is joined to the rotating shaft 7 by tightening the bolt 24.

As a result, the endless string-shaped member 16 for operation described with reference to FIG. 1 is operated, and the return spring force of the wound return spring 20 is used as an auxiliary force to rotate the rotation shaft 7 for opening and moving the shutter curtain 1. Since the coil wire portions 20C of the return spring 20 are not in contact with each other, no loss due to contact occurs in these coil wire portions 20C, and therefore, the return spring 20 is originally appropriate. It is possible to generate a return spring force that has become.

According to the extension device 30 according to the present embodiment described above, the extension device 30 has a coupling member 32 that is immovably coupled to the rotation shaft 7 in the axial direction, and a return spring 20. Since the load applying member 33 that engages with the connected flange member 22 is provided, it is easy to increase the coil axial length of the wound return spring 20 by the load applying member 33. It can be done quickly and work efficiency can be improved.

Further, since the main body 31 of the extension device 30 is provided with adjusting means 60 and 63 capable of adjusting the size of the distance between the coupling member 32 and the load applying member 33 in the length direction of the main body. The extension device 30 according to the present embodiment can be applied to various return springs having different coil axial lengths.

Further, the adjusting means 60 and 63 provided in the main body 31 include rough adjusting means 60, and according to the rough adjusting means 60, the length dimension of the main body 31 can be roughly adjusted in a plurality of stages, so that the coupling member 32 The work of adjusting the size of the distance between the load and the load applying member 33 to a size close to an appropriate size can be performed in a short time.

Further, the adjusting means 60 and 63 provided in the main body 31 include fine adjusting means 63 by the screw mechanisms 61 and 62, and according to the fine adjusting means 63, there is a space between the coupling member 32 and the load applying member 33. The interval can be set to a fine and accurate size.

Further, since there are two fine adjustment means 63, and these fine adjustment means 63 are based on the left-hand thread mechanism 61 and the right-hand thread mechanism 62, the first and second main body members 34 and 35 of the main body 31 are used. Rotating in one direction increases the length dimension of the main body 31 in the axial direction of the rotating shaft 7, and rotating the first and second main body members 34, 35 in the opposite direction increases the length of the main body 31 in the axial direction of the rotating shaft 7. In order to finely adjust the distance between the coupling member 32 and the load applying member 33 by selecting the rotation direction of the first and second main body members 34 and 35, the length of the main body 31 is reduced. You can easily perform fine adjustment work to increase or decrease the dimensions.

Further, as described with reference to FIG. 5, the connecting portion 48 connecting the bolt shaft 46 constituting the main body 31 and the load applying member 33 and the engaged portion 25 of the flange member 22 of the return spring 20 The distance between the engaging portion 33A for applying the load from the load applying member 33 is L1, and the connecting portion 48 and the operator apply the load due to the operating force to the load applying member 33. Since the distance between the load acting portion 33B and the load acting portion 33B is L2 and the spacing L1 is smaller than the spacing L2, the operating force applied by the operator to the load acting portion 33B is based on the principle of the lever. A large load is applied to the engaged portion 25 of the flange member 22 with which the engaging portion 33A is engaged, and therefore, even a strongly wound return spring is required to sufficiently extend. A large load can be applied to the return spring 20.

Further, the engaged portion 25 of the flange member 22 into which the engaging portion 33A of the load applying member 33 is inserted and engaged is a portion where the winding tool 26 of FIG. 3 used for winding the return spring 20 is inserted and engaged. Therefore, the engaged portion 25 can be used as it is to increase the coil axial length of the return spring 20 by the load applying member 33, and the return spring 20 or the flange member 22 is loaded. It is not necessary to form a special portion for engaging the imparting member 33.

The coupling member 32 of the extension device 30 of the above-described embodiment is coupled to the rotary shaft 7 so as to be immobile in the axial direction of the rotary shaft 7, but the coupling member is connected to the return spring. 20 may be coupled to the end portion on the side where the flange member 21 is provided so as to be immovable in the axial direction of the rotating shaft 7. Further, the end portion of the return spring 20 on the side where the flange member 21 is provided includes the flange member 21, the bracket 8 to which the flange member 21 is connected, and the immovable member 18.

INDUSTRIAL APPLICABILITY The present invention can be used for an opening / closing device such as an oversliding door device in which a return spring by a coil spring is wound and arranged on a rotating shaft that rotates forward / reverse in order to open / close the switchgear. ..

1 Shutter curtain that is an opening / closing body 7 Rotating shaft 8, 9 Bracket that is an immovable member 18 Immovable member such as a beam 20 Return spring 25 Engagement part 26 Winding tool 30 Extension device 31 Main body 32 Coupling member 32B Missing part for coupling 33 Load applying member 33A Engaging part 33B Load acting part 39 Bracket that connects the connecting member and the main body 48 Connecting part 60 Rough adjustment means 63 Fine adjustment means L1, L2 Interval

Claims (14)

It is a coil spring that assists the rotation of the rotating shaft that rotates to open and close the opening and closing body of the opening and closing device when the opening and closing body opens and moves due to the return spring force accumulated by winding. An extension device for a return spring for an opening / closing device used to extend the coil axial length of a return spring whose one end in the direction is connected to an immovable member and whose other end is connected to the rotating shaft. And,
The coupling member coupled to the rotating shaft is engaged with the other end of the return spring, and a load is applied to the other end in the direction of increasing the coil axial length of the return spring. A load-applying member to be used, and a main body for connecting the coupling member and the load-applying member are provided.
For a switchgear, the coupling member is movable with respect to the main body, and the coupling portion is immovably coupled to the rotation shaft in the axial direction of the rotation shaft by this movement. Return spring extension device. In the extension device for the switchgear return spring according to claim 1, the motion is a motion in which the coupling member is tilted in a direction orthogonal to the axial direction of the rotation axis. Spring extension device. The extension device for a switchgear return spring according to claim 2, wherein the coupling member is rotatably attached to the main body. The switchgear return spring extension device according to claim 2 or 3, wherein the switchgear is provided with a coupling notch into which the rotating shaft is fitted. Return spring extension device. In the extension device for the return spring for a switchgear according to claim 4, the size of the missing portion for coupling is such that the rotating shaft is fitted in a loose state for the switchgear. Return spring extension device. In the extension device for the return spring for a switchgear according to any one of claims 1 to 5, the main body is provided with a size of a gap between the coupling member and the load applying member in the axial direction of the rotation shaft. An extension device for a return spring for a switchgear, characterized in that an adjustment means for making the adjustment possible is provided. The extension device for a switchgear return spring according to claim 6, wherein the adjustment means includes a coarse adjustment means and a fine adjustment means. In the extension device for the return spring for a switchgear according to any one of claims 1 to 7, the load-applying member is rotated to the main body at a connecting portion provided in the middle of the load-applying member in the length direction. An extension device for a return spring for a switchgear, characterized in that it is a rod-shaped member that is movably connected. In the extension device for the return spring for an opening / closing device according to claim 8, one end of the load-applying member is an engaging portion that is engaged with the other end of the return spring. The other end of the load applying member is a load acting portion that exerts a load on the load applying member, and the distance between the connecting portion and the engaging portion is such that the connecting portion and the load acting portion are separated from each other. A return spring extension device for an opening / closing device, characterized in that it is smaller than the distance between the parts. It is a coil spring that assists the rotation of the rotating shaft that rotates to open and close the opening and closing body of the opening and closing device when the opening and closing body opens and moves due to the return spring force accumulated by winding. A method for extending a return spring for an opening / closing device for extending the coil axial length of a return spring whose one end in the direction is connected to an immovable member and whose other end is connected to the rotating shaft. There,
The first work step for winding the return spring and
A second working step for extending the coil axial length of the return spring, and
Including
The second work step is a work step performed by an extension device having a coupling member and a load applying member, and the coupling member is coupled to the rotating shaft and engaged with the other end of the return spring. A method for extending a return spring for an opening / closing device, which comprises applying a load to the combined load-applying member in a direction of increasing the coil axial length of the return spring. .. In the method for extending a return spring for a switchgear according to claim 10, the extension device includes a main body that connects the coupling member and the load applying member, and the coupling member can move with respect to the main body. An extension work of a return spring for a switchgear, which comprises causing the coupling portion to perform this movement so that the coupling portion is immovably coupled to the rotation shaft in the axial direction of the rotation shaft. Method. In the extension work method of the switchgear return spring according to claim 10 or 11, the coil wire portions of the return spring are in contact with each other by the first work step, and the coil wires are in contact with each other by the second work step. An extension work method for a return spring for a switchgear, characterized in that the portions are separated from each other. In the method for extending a switchgear return spring according to any one of claims 10 to 12, the first work step is performed with the switchgear in a fully closed position. Extension work method. In the extension work method of the switchgear return spring according to any one of claims 10 to 13, the distance between the coupling member and the load applying member can be adjusted, and the second work step is the coupling. A method for extending a return spring for a switchgear, characterized in that the distance between the member and the load applying member is adjusted to the coil axial length of the return spring on which the second work step is carried out. ..

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