JP2019138066A - Return spring extension device for opening/closing device - Google Patents

Abstract

To provide a return spring extension device for an opening/closing device, which can easily and quickly extend the length of a return spring in the axial direction of a coil even when the return spring is arranged in such a manner that the return spring is wound around and fastened to a rotating shaft of the opening/closing device.SOLUTION: A return spring 20 is wound around the outer periphery of a rotating shaft 7 which rotates in the forward and reverse directions to open and close an opening/closing body. One longitudinal end of the return spring 20 is connected to a stationary member 18 via a flange member 21 and a bracket 8, and the other longitudinal end is connected to the rotary shaft 7 via a flange member 22. An extension device 30 has a coupling member 32 and a load applying member 33 separated in the axial direction of the rotating shaft 7. The coupling member 32 is coupled to the rotating shaft 7 or the one end of the return spring so as to be fixed in the axial direction of the rotating shaft 7. The load applying member 33 causes its engaging section 33A to be inserted into and engaged with an engaged portion 25 of the flange member 22, thereby increase the length of the return spring 20 in the axial direction of the coil by the load of the operation force applied to a load acting section 33B.SELECTED DRAWING: Figure 10

Description

  The present invention is to extend a return spring by a coil spring wound around an outer periphery of a rotating shaft for opening and closing an opening / closing body such as a shutter curtain so as to obtain an original return spring force. The present invention relates to an extension device for a return spring for an opening / closing device used, and can be used, for example, as a return spring for an opening / closing device such as an oversliding door device.

  Patent Document 1 below discloses an oversliding door device serving as an opening / closing device for opening / closing an opening such as an entrance / exit by a shutter curtain which is an opening / closing body. The oversliding door device includes a rotating shaft that rotates forward and backward to open and close the shutter curtain, and a return spring by a coil spring is wound around the outer periphery of the rotating shaft. One end in the vertical direction is connected to the immobile member, and the other end is connected to the rotating member, and the return spring force accumulated by tightening the return spring opens and moves the shutter curtain. Therefore, it becomes at least a part of the rotational force of the rotating shaft.

JP 2012-261131 A

  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 and tightened during construction work of the over-sliding door device. Work is done. When this operation is performed, the coil springs arranged in the axial direction of the rotating shaft come into contact with the return spring, which is a coil spring, 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 for this purpose, loss due to contact occurs in the return spring force, 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 operation for increasing the axial length of the return shaft in the axial direction of the rotating shaft, Since the coil wire portions of the return spring that are in contact with each other are separated from each other, and the return spring at this time is wound up, this extension work requires a large extension force. And this work must be done over time.

  An object of the present invention is to provide a return for an opening / closing device that can easily and quickly perform an operation of extending the length of the return spring in the coil axis direction even when the return spring is wound around the rotary shaft of the opening / closing device. A spring extension device is provided.

  An extension device for a return spring for an opening and closing device according to the present invention is wound around an outer periphery of a rotating shaft that rotates forward and backward in order to open and close the opening and closing body of the opening and closing device, and one end in the length direction is a stationary member. And the other end is a coil spring connected to the rotating member, and the return spring force accumulated by tightening causes the rotational force of the rotating shaft to open and move the opening / closing body. An extension device for a return spring for an opening / closing device used for extending the length of the return spring in the coil axis direction, which is at least a part of the return spring, wherein the rotation shaft or the one end of the return spring has the rotation A coupling member fixedly coupled in the axial direction of the shaft, coupled to the coupling member, engaged with the other end of the return spring, and the other end of the return spring Increase coil axial length And it is characterized in that it comprises a load applying member for applying a load in the direction.

  As described above, the extension device for the return spring for the switching device according to the present invention includes a coupling member that is fixedly 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. And a load applying member that is engaged with the other end of the return spring and applies a load in the direction of increasing the coil axial length of the return spring to the other end. Therefore, after the coupling member is fixedly coupled to one end of the rotary shaft or the return spring in the axial direction of the rotary shaft, the other member is engaged by the load applying member engaged with the other end of the return spring. By applying a load in the direction of increasing the coil axial length of the return spring to the end of the coil, the coil axial length of the return spring can be increased and the coils of the return springs in contact with each other The wire part can be separated, Work to increase the coil axial length of the return spring clamped obtained can be carried out easily and quickly.

  In the extension device for the return spring for the switching device according to the present invention, the load for increasing the length of the return spring in the coil axial direction may be applied to the load applying member manually by an operator. Alternatively, a driving device such as an electric motor or a hydraulic cylinder may be connected to the load applying member, and the driving force from this driving device may be used.

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

  Furthermore, in the present invention, the coupling member and the load applying member that are connected to each other may be connected via a main body of the extension device of the return spring for the switching device.

  When the coupling member and the load applying member are connected through the main body of the extension device of the return spring for the opening / closing device in this way, the main body includes a coupling member and a load applying member in the axial direction of the rotating shaft. It is preferable to provide an adjusting means for making it possible to adjust the size of the gap between the two.

  According to this, since the magnitude | size of the space | interval between a coupling member and a load provision member can be adjusted with an adjustment means, each coil axial direction length which is the axial direction length of a rotating shaft differs. As for the return spring, the extension device for the return spring for the switchgear according to the present invention can be applied.

  Further, when the adjustment means for adjusting the size of the interval between the coupling member and the load applying member is provided on the main body as described above, it is preferable to provide both the rough adjustment means and the fine adjustment means on the main body. .

  According to this, the coarse adjustment means can make the interval between the coupling member and the load applying member close to a predetermined size in a short time, and the fine adjustment means can apply the load to the coupling member and the load application member. The distance between the members can be set to a fine and accurate size.

  In order to provide the coarse adjustment 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. A plurality of locked portions formed in the axial direction of the rotary shaft are provided on the second main body member that is movable in the axial direction, and the second main body member is provided in the axial direction of the rotary shaft. It is good also as a thing provided with the latching member which can be sequentially latched by several to-be-latched parts by moving to.

  According to this, by moving the second body member in the axial direction of the rotation shaft relative to the first body member, the locking member provided in the first body member is moved to the second body member in the axial direction of the rotation shaft. Since the length dimension of the main body in the axial direction of the rotating shaft can be adjusted in a plurality of stages by sequentially locking each of the plurality of locked portions formed on the connecting member and the load applying member. The interval between them can be roughly adjusted.

  In order to provide fine adjustment means on the main body, for example, the fine adjustment means includes an internal thread member provided with an internal thread hole, and an external thread member in which an external thread is screwed into the internal thread hole of the internal thread member, Of the female screw member and the male screw member, when one of them is rotated, the other may be moved to change the length of the main body in the axial direction of the rotation shaft.

  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, the coarse adjustment means is provided at an intermediate position in the axial direction of the rotation shaft in the main body, and the two fine adjustment means are provided at both ends in the axial direction of the rotation shaft in the main body, and these fine adjustment means constitute the main body. When the main body member is rotated in one direction, the length of the main body in the axial direction of the rotary shaft increases, and when the main body member is rotated in the opposite direction to the one direction, the main body in the axial direction of the rotary shaft It is good also as a thing by the right-handed screw mechanism and left-handed screw mechanism in which the length dimension becomes small.

  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 rotation shaft is increased, and when the main body member is rotated in the opposite direction to the one direction, the axial direction of the rotation shaft is increased. Because the length of the main body is reduced, the length of the main body is increased or decreased in order to finely adjust the distance between the coupling member and the load applying member by selecting the rotation direction of the main body member. Can be easily adjusted.

  Moreover, about the said load provision member provided in the expansion | extension apparatus of the return spring for switchgear concerning this invention, as an example, this load provision member is in the connection part provided in the middle part of the length direction of the load provision member. The rod-shaped member is pivotally connected to the main body, and one end portion of the rod-shaped load applying member is an engaging portion engaged with the other end portion of the return spring. The other end portion of the applying member is a load acting portion that applies a load to the load applying member, and the interval between the connecting portion and the engaging portion is smaller than the interval between the connecting portion and the load acting portion. May be.

  According to this, since the interval between the connecting portion and the engaging portion is smaller than the interval between the connecting portion and the load acting portion, the load applied to the load acting portion is a large load according to the lever principle. Is transmitted to the engaging portion, and for this reason, the length of the return spring wound in the coil axial direction is sufficiently extended to the other end of the return spring with which the engaging portion is engaged. Therefore, a large load necessary for the purpose can be applied.

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

  In the present invention, the other end of the return spring is provided with a flange member coupled to the return spring, and the flange member is provided with an engaged portion into which the load applying member is inserted and engaged. The load applying member may be engaged with the other end of the return spring by inserting and engaging the load applying member with the engaged portion.

  Furthermore, the engaged portion of the flange member may be configured to insert and engage a winding tool used when winding the return spring.

  According to this, the engaged portion of the flange member that inserts and engages the load applying member is provided in advance in the flange member in order to insert and engage the tightening tool that is used when the return spring is tightened. Therefore, it is possible to perform the insertion engagement of the load applying member to the flange member using the engaged portion without providing a special portion for inserting and engaging the load applying member to the flange member. Become.

  The extension device of the return spring for the switchgear according to the present invention described above is applicable to any switchgear as long as the switchgear is wound around the outer periphery of the rotating shaft and wound around the return spring by the coil spring. The opening / closing device may be an oversliding door device, or a shutter device for a window or an entrance / outlet that is retractable and retracted to a winding shaft having a shutter curtain that is an opening / closing body as a rotating shaft. But you can. The opening / closing body may be a panel type in which a plurality of panels are continuously provided in the opening / closing movement direction, or a slat type in which a plurality of slats are provided in the opening / closing movement direction, or It may be a bar type in which a bar member made up of a plurality of pipes having a transverse direction in the length direction is continuously provided in the opening and closing movement direction, or may be a sheet type formed of a sheet, or these Among the opening / closing member constituting members, a member formed by combining a plurality of types of opening / closing member constituting members may be used.

  According to the present invention, even if the return spring is wound around the rotating shaft of the opening / closing device, the effect of extending the length of the return spring in the coil axial direction can be obtained easily and quickly.

FIG. 1 is a schematic perspective view of an oversliding door device that 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 and is a front view showing a portion where the return spring is arranged. FIG. 3 is a front view showing the return spring before being tightened. FIG. 4 is a front view showing the return spring after being tightened. FIG. 5 is a front view showing the entire extension device according to an embodiment of the present invention. FIG. 6 is a plan view showing the entire extension device of FIG. FIG. 7 is a front sectional view showing the coarse adjustment means provided in the main body of the extension device. FIG. 8 is a side view showing a coupling member provided in the extension device. FIG. 9 shows that the length of the main body can be adjusted by coarse adjustment means and fine adjustment means provided in the main body of the extension device, and that the coupling member and the load applying member can be rotated with respect to the main body. FIG. 6 is a view similar to FIG. FIG. 10 is a front view showing an operation for increasing the length of the return spring in the coil axial direction by the extension device. FIG. 11 is a diagram illustrating a state where the coupling member is coupled to the rotating shaft in a stationary manner in the axial direction of the rotating shaft.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated based on drawing. 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. This opening / closing device is used for a building such as a warehouse. This is an oversliding door device installed at the doorway. In FIG. 1, a shutter curtain 1 serving as an opening / closing body of an oversliding door device is a panel type formed by connecting a plurality of panels 2 in the vertical direction that is the opening / closing movement direction of the shutter curtain 1. The panels 2 adjacent to each other in the vertical direction are rotatably connected by a hinge 3. On both sides of the shutter curtain 1 in the width direction, guide rollers 5 are arranged in a connecting portion between the panels 2 with bar members 4 protruding in the width direction of the shutter curtain 1, and these guide rollers 5 are The left and right guide rails 6 are inserted into the guide grooves. Each guide rail 6 is connected via a first portion 6A having a vertical component and extending vertically, and a second portion 6B curved at the upper end of the first portion 6A. And the third portion 6C extending with or without the vertical component in the front-rear direction.

  Therefore, the shutter curtain 1 is opened and closed according to the shape of the guide rails 6 when the guide rollers 5 are guided by the pair of left and right guide rails 6. 1, when the first part 6 </ b> A of the pair of left and right guide rails 6 is reached, the entrance of the building formed between the first parts 6 </ b> A is closed by the shutter curtain 1. When each guide roller 5 reaches the second portion 6B or the third portion 6C, the shutter curtain 1 opens the entrance.

  Above the doorway, a rotary shaft 7 is horizontally disposed, and two winding drums 10 are attached to both ends in the axial direction of the rotary shaft 7 supported rotatably by the brackets 8 and 9. These winding drums 10 are wound around a winding string member 11 made of wire or the like whose upper end is coupled to the winding drum 10 so as to be unwound, and the lower end of the driving string member 11 is a shutter. It is connected to the lower end of the curtain 1. Of the two winding drums 10, a rotating member 12 such as a sprocket wheel is coupled and integrated with one winding drum 10, and an endless string member for interlocking by a chain or the like that is wound around the rotating member 12. 13 is also wound around the rotating member 14. The rotating member 14 is integrally joined with a rotating member 15 such as a pulley around which the operation endless string-like member 16 is wound. Therefore, a person operates the operation endless string-like member 16 to rotate the rotation member 14. 15 is rotated forward and backward, and this rotation is transmitted to the rotating member 14, the interlocking endless string-like member 13, and the rotating member 12, and when the winding drum 10 and the rotating shaft 7 rotate forward and backward, the winding drum 10 drives The shutter curtain 1 is opened and closed by being guided by the guide rail 6 by winding and unwinding the cord-like member 11.

  Thus, the return spring 20 by the coil spring is wound around the outer periphery of the rotating shaft 7 that rotates forward and backward in order to open and close the shutter curtain 1, and the length of the return spring 20 is the length direction of the return direction of the coil axis. One end is connected to a bracket 8 which is a stationary member, and the other end is connected to a rotating shaft 7. When the return spring 20 wound 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, for example, as shown in FIG. 1. As described above, when the shutter curtain 1 has reached the fully closed position, the rotation of the rotating shaft 7 by the operation of the endless string-like member 16 for manipulating and moving the shutter curtain 1 upward is performed by this rotation. The rotation of the shaft 7 is performed by being assisted by the return spring force of the return spring 20.

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

  The oversliding door device described above was a manually operated type in which the shutter shaft 1 is opened and closed by rotating the rotating shaft 7 forward and backward by a person operating the endless string member 16 for operation. An extension device for a return spring 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 disposed on a rotating shaft that rotates forward and backward by a driving force from a driving device such as an electric motor. . In addition, the extension device for the return spring for the switching device according to the embodiment of the present invention balances the weight of the shutter curtain with a balance weight, so that the opening and closing movement of the shutter curtain can be easily performed manually. The present invention can also be applied to an oversliding door device.

  The rotating shaft 7 shown in FIG. 1 is composed of two left and right rotating shaft members 7A and 7B connected by a joint member 17, and these rotating shaft members 7A and 7B are rotated by brackets 8 and 9, respectively. The winding drum 10 and the return spring 20 are disposed on each of the rotating shaft members 7A and 7B.

  FIG. 2 shows an enlarged view of the rotating shaft member 7A of the rotating shaft members 7A and 7B, and the take-up drum 10 and the return spring 20 disposed on the rotating shaft member 7A. In FIG. 2, a stationary member 18 such as a beam, which is disposed above the entrance of the building described above and to which the brackets 8 and 9 are attached, is indicated by a two-dot chain line. In FIG. 3, the return spring 20 is further enlarged. 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 7 </ b> A constituting the rotary shaft 7. , 22 are disposed, and these flange members 21, 22 are provided with insertion portions 21A, 22A inserted into the return spring 20, respectively. Of these insertion portions 21A and 22A, a hole 21B is formed in the insertion portion 21A, and one bent end portion 20A of the return spring 20 is inserted and locked into the hole 21B, and the insertion portion 22A. A hole 22B is also formed, and the other end 20B of the return spring 20 that is bent is inserted and locked into the hole 22B. Accordingly, 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 is fixed 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 above-described stationary member 18 such as a beam via the flange member 21 and the bracket 8. The other flange member 22 has bolts 24 serving as set screws screwed in from the outer peripheral surface of the flange member 22, and a plurality of bolts provided in the circumferential direction of the flange member 22. 24 is rotated for tightening, and the front ends of these bolts 24 abut against the rotary shaft member 7A. As a result, the flange member 22 is connected to the rotary shaft member 7A. The other end portion in the direction is connected to a rotating shaft member 7 </ b> A that is a constituent member of the rotating shaft 7 via a flange member 22.

  2 and 3 show the 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 rotary shaft 7 are separated from each other in the axial direction of the rotary shaft 7, in other words, in the coil axis direction. Yes.

  When the return spring 20 is tightened, the bolts 24 serving as set screws are loosened, and then, as shown in FIG. 3, a plurality of flange members 22 are formed at equal intervals on the outer peripheral surface. The operator sequentially inserts and engages the distal end portion of the bar-shaped winding tool 26 into the engaged portion 25 such as a hole or a recess, and the operation of the winding tool 26 causes the flange member 22 to rotate the rotary shaft member 7A. By rotating to the center, the return spring 20 is tightened. After the tightening, 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 part is connected to the rotating shaft member 7A.

  FIG. 4 shows the return spring 20 wound in this manner. 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 length of the return spring 20 in the coil axial direction increases.

  As shown in FIG. 1, the tightening operation 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. . The amount of tightening of the return spring 20 at this time is that 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. It is set to a large amount of tightening.

  For this reason, the tightening operation performed on the return spring 20 is performed with a large tightening force, and a large contact force is generated in each coil wire portion 20 </ b> C of the return spring 20. As described above, 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 using the return spring force of the return spring 20 as an auxiliary force as described above. If it tries to do so, since the said big contact force will inhibit each coil wire part 20C from shifting | deviating and rotating in the circumferential direction of the rotating shaft member 7A which is a direction which loosens the return spring 20, it will return spring 20 Therefore, it is difficult to cause the shutter spring 1 to open and move upward as predetermined.

  For this reason, in order to make it possible to generate the original proper return spring force in the return spring 20, the length of the wound return spring 20 in the coil axial direction is extended and the coil wire portion that has been in contact In order to perform the work of separating the 20Cs, 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, the case where the extension device 30 is used for the return spring 20 shown in FIG. 3 will be described. However, the extension device 30 is reversed left and right so that it is symmetrically arranged in the axial direction of the rotary shaft 7. 1 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 portion in the length direction of the main body 31. The coupling member 32 and a load applying member 33 connected to the other end portion in the length direction of the main body 31 are provided. The main body 31 includes a first main body member 34 and a second main body member 35 each having a length in the axial direction of the rotary shaft 7. In the present embodiment, the first main body 31 is configured. The member 34 is made of a large-diameter pipe material, and the second body member 35 is made of a small-diameter pipe material. A part of the second body member 35 is slidably inserted into the first body member 34. Accordingly, one of the main body members 34 and 35 is movable in the axial direction of the rotary shaft 7 with respect to the other. For this reason, the length dimension of the main body 31 and the coupling member 32 and The distance between the load applying member 33 can be adjusted. A gripping member 36 for an operator to grip the main body 31 is attached to the outer periphery of the first main body member 34.

  A nut 37 serving as a female screw member provided with a female screw hole is coupled to an end of the first main body member 34 opposite to the second main body member 35, and a male screw member is formed in the female screw hole of the nut 37. A part of the bolt shaft 38 is inserted into the nut 37 and the first main body member 34 by screwing the male screw of the bolt shaft 38. A bifurcated bracket 39 is connected to the end of the bolt shaft 38 protruding from the nut 37 so as to be rotatable about a pin 39A, and the above-described coupling member 32 is connected to the bracket 39 via a rod-like 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 a plate material has an opening 32 </ b> A opened in a direction orthogonal to the axial direction of the rotating shaft 7, as shown in FIG. 8. In addition, a semicircular or substantially semicircular coupling notch 32B that is continuous with the opening 32A and has a width smaller than that of the opening 32A is provided behind the opening 32A. The lid member 41 is attached to the coupling member 32 so as to be rotatable about the central axis 41A. When the lid member 41 is pivoted about the central axis 41A, the opening 32A of the coupling member 32 is opened. The lid member 41 that is opened and closed and rotated by its own weight about the central axis 41A closes the opening 32A when the stop portion 41B provided on the lid member 41 comes into contact with the coupling member 32. Maintain state.

  As shown in FIG. 8, the width dimension of the coupling notch 32 </ b> B provided in the coupling member 32 is slightly larger than the diameter dimension of the rotating shaft 7.

  As shown in FIGS. 5 and 6, the nut 45 is a female screw member provided with a female screw hole at the end opposite to the first main body member 34 in the second main body member 35 described above. 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, whereby 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 connected to the end of the bolt shaft 46 protruding from the nut 45 so as to be rotatable about a pin 47A, and the load applying member 33 is a rod-like member. The load applying member 33 is attached to the bolt shaft 46 by the bracket 47 at an intermediate position in the length direction of the load applying member 33. And the arrangement | positioning location of the bracket 47 becomes the connection part 48 of the volt | bolt axis | shaft 46 and the load provision member 33 by this bracket 47. As shown in FIG.

  One end portion in the length direction of the load applying member 33 is a portion that can be inserted and engaged with the engaged portion 25 of the flange member 22 connected to the end portion of the return spring 20 shown in FIG. Thus, the engaging portion 33A can apply a load from the load applying member 33 to the engaged portion 25, and the other end is for the operator to apply a load to the load applying member 33. It is a load acting part 33B. In the present embodiment, the load acting portion 33 </ b> B is formed by attaching a large-diameter member to the outer periphery of the load applying member 33 so that the operator can easily grasp it.

  As shown in FIG. 5, the interval between the connecting portion 48 and the engaging portion 33A is L1, and the interval 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 fixed to the first body member 34 on the outer periphery of the end of the first body member 34 opposite to the second body member 35. As shown in FIG. 7, the holding member 50 holds a locking member 52 by a shaft 51 that is non-rotatably coupled to the holding member 50, and the locking member 52 is centered on the shaft 51. It is freely rotatable. A torsion coil spring 53 is wound around the outer periphery of the shaft 51, one end 53 </ b> A of the torsion coil spring 53 abuts on the locking member 52, and the other end 53 </ b> B is coupled and fixed to the holding member 50. The locking member 52 is always elastically urged in the right direction 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 that is pressed toward the second main body member 35 by this elastic bias, and the other end is the work portion. 7 is a pressing portion 52 </ b> B for the person to rotate the locking member 52 in the left direction in FIG. 7 against the spring force of the torsion coil spring 53 around the shaft 51.

  The second main body member 35 can be locked with the locking portion 52A of the locking member 52 at a position facing the locking member 52 arranged on the first main body member 34 by the holding member 50 as described above. And the to-be-latched part 35A which can be separated is formed, and this to-be-latched part 35A which becomes a recessed part, a hole, etc. formed in the 2nd main body member 35 is 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, the operator presses the pressing portion 52B of the locking member 52 and rotates the locking member 52 in the left direction in FIG. The second main body member 35 is moved in the length direction of the main body 31 that is the axial direction of the rotary shaft 7 and the pressing of the pressing portion 52B is released, so that the locking portion 52A of the locking member 52 is moved to a plurality of covered portions. The length dimension of the main body 31 is changed by locking to one locked portion 35A of the locking portions 35A. And since the to-be-latched part 35A is provided with two or more at equal intervals in the length direction of the 2nd main body member 35 which is also the length direction of the main body 31, the 2nd main body member 35 is made into the 1st 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. In other words, the size of the interval 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 interval between the locked portions 35A in a plurality of stages.

  For this reason, in the present embodiment, the axial direction of the rotary shaft 7 is determined by the locking member 52 disposed on the first main body member 34 and the locked portions 35A provided on the second main body member 35. Thus, coarse adjustment means 60 for coarsely adjusting the size of the interval 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.

  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. Among these bolt shafts 38 and 46, the bolt shaft 38 has a male screw formed on the outer periphery of the bolt shaft 38 as a left screw, and the nut 37 into which the bolt shaft 38 is screwed is also a female screw. Since the hole is a female left screw hole, the main body 31 is provided with a left screw mechanism 61. The bolt shaft 46 has a male screw formed on the outer periphery of the bolt shaft 46 as a right-hand screw, and the above-described nut 45 into which the bolt shaft 46 is screwed also has a female screw hole as a female right-hand screw hole. Therefore, the main body 31 is also provided with a right-hand thread mechanism 62.

  For this reason, the holding member provided in the first main body member 34 in a state in which the coupling member 32 and the load applying member 33 disposed 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 coarse adjusting means 60 are moved in one direction around the axis of the main body 31 by the hand holding the 36. , The nuts 37 and 45 which are female screw members also rotate in this one direction with respect to the bolt shafts 38 and 46 which are male screw members. In order to move outward in the longitudinal direction of the main body 31 that is the direction, the left screw mechanism 61 and the right screw mechanism 62 are used to increase the length dimension of the main body 31 that is the axial length of the rotating shaft 7 and 32 and the load applying member 33 Interval can be increased of. When the first main body member 34 and the second main body member 35 are rotated in the opposite directions around the axis of the main body 31, the nuts 37 and 45 are also rotated in the opposite direction, and the bolt shafts 38 and 46 are fed. In order to move inward in the longitudinal direction of the main body 31, the length dimension of the main body 31 is reduced by the left screw mechanism 61 and the right screw mechanism 62, and the distance between the coupling member 32 and the load applying member 33. Can be reduced.

  For this reason, since the length dimension of the main body 31 can be finely adjusted by the left screw mechanism 61 and the right screw mechanism 62, the left screw mechanism 61 and the right screw mechanism 62 are arranged in the axial direction of the rotary shaft 7. In order to finely adjust 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, two fine adjustment means 63 are provided on the main body 31. ing.

  In the present embodiment, the coarse adjustment means 60 is provided at an intermediate position in the axial direction of the rotation shaft 7 in the main body 31, and two fine adjustment means are provided at both end positions in the axial direction of the rotation shaft 7 in the main body 31. 63 is provided.

  Moreover, in the expansion | extension apparatus 30 which concerns on this embodiment, as FIG. 9 shows, the coupling member 32 mentioned above is rotatable centering on the pin 39A of the bracket 39 with respect to the main body 31, 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 length in the coil axial direction of the return spring 20 that is wound by the operation of the bar-shaped tightening tool 26 and disposed on the outer periphery of the rotating shaft 7 is extended according to the present embodiment. An operation for extending by the device 30, that is, an operation for increasing the length in the coil axial direction will be described. At this time, at one end of the return spring 20, as described with reference to FIG. 2 and the like, the flange member 21 connected to the one end is coupled to the stationary member 18 via the bracket 8. Therefore, it is connected to this immovable member 18. The other end of the return spring 20 is connected to the rotary shaft 7 because the flange member 22 connected to the end is connected to the rotary shaft 7 by a bolt 24 that is a set screw.

  In order to extend the length in the coil axis direction of the return spring 20 that is wound around the outer periphery of the rotary shaft 7 by the extension device 30 according to this embodiment, first, the length dimension of the main body 31 of the extension device 30 is set. As shown in FIG. 10, the coarse adjustment means 60 sets a length slightly larger than the overall length of the return spring 20 including the two flange members 21 and 22. Next, the lid member 41 that is rotatable about the central axis 41A is opened and rotated with respect to the coupling member 32, and the rotary shaft 7 is inserted from the opening 32A formed in the coupling member 32. As shown in FIG. 8, the rotary shaft 7 is fitted into the coupling notch 32 </ b> B of the coupling member 32 in a loose state. After performing this loose fitting operation, the lid member 41 is rotated by its own weight about the central axis 41A to close the opening 32A of the coupling member 32, and the rotary shaft 7 is connected to the coupling missing part 32B and the opening. Exiting from 32A is prevented.

  Thereafter, as shown in FIG. 10, the main body 31 is moved in the longitudinal direction of the main body 31 to move the posture of the coupling member 32 formed of the plate material so that the pin 39 </ b> A of the bracket 39 is moved. The center is inclined with respect to the direction orthogonal to the axial direction of the rotating shaft 7. As a result, as shown in FIG. 11, two corner portions 32 </ b> C that are separated from each other in the axial direction of the rotating shaft 7 in the coupling missing portion 32 </ b> B and are also separated in the diametrical direction of the rotating shaft 7. , 32D abuts on the rotating shaft 7. As a result, the coupling member 32 provided in the extension device 30 is coupled to the rotating shaft 7 on which the return spring 20 is disposed in an immobile manner in the axial direction of the rotating shaft 7.

  At this time, the engaging portion 33A at the distal end portion 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 portion of the return spring 20. Keep together. Thereafter, the main body 31 is rotated in one direction around the axis of the main body 31 by the gripping member 36 attached to the main body 31 or in the opposite direction. The length of the main body 31 is finely adjusted by the two fine adjustment means 63 by the right screw mechanism 62 so that the load applying member 33 is moved relative to the main body 31 and the rotary shaft 7 as shown in FIG. A right angle or a substantially right angle.

  Next, the bolt 24 that has joined the flange member 22 to the rotary shaft 7 as a set screw is loosened. As a result, the return spring 20 that is tightened has an expansion force that increases the length in the coil axial direction due to the spring repulsive force, so that the load acting portion 33B provided at the rear end portion of the load applying member 33 When the operator applies an operation force that opposes the expansion force, the return spring 20 is prevented from expanding. In addition, this blocking can also prevent the flange member 22 from rotating about the rotating shaft 7 due to the unwinding force of the return spring 20, and maintain the tightened state of the return spring 20.

  Thereafter, the operator applies an operating force for rotating the load acting portion 33B toward the coupling member 32 around the pin 47A of the bracket 47 on the load acting portion 33B of the load applying member 33. As a result, the load applying member 33 is inclined with respect to the main body 31 and the rotary shaft 7 as indicated by a two-dot chain line in FIG. 10, and in the length direction of the main body 31 of the extension device 30. Since the coupling member 32 provided at one end is fixedly coupled to the rotary shaft 7 in the axial direction of the rotary shaft 7, the engagement member 32 </ b> A of the load applying member 33 is connected to the flange member 22. The return spring 20 to which the operating force is applied to the engaged portion 25 is extended with the coil axial length increased while maintaining the tightened state. The coil wire portions 20 </ b> C that are in contact with each other side by side in the axial direction of the rotating shaft 7 are separated in the axial direction of the rotating shaft 7. Thereafter, an operation of coupling the flange member 22 to the rotary shaft 7 by an operation of tightening the bolt 24 is performed.

  Accordingly, the rotation of the rotary shaft 7 for opening and moving the shutter curtain 1 by operating the endless string member 16 for operation described with reference to FIG. 1 and using the return spring force of the wound return spring 20 as an auxiliary force. Since the coil wire portions 20C of the return springs 20 are not in contact with each other, there is no loss due to contact with the coil wire portions 20C. Thus, the return spring force can be generated.

  According to the extension device 30 according to the present embodiment described above, the extension device 30 is connected to the rotating shaft 7, the coupling member 32 fixedly coupled in the axial direction of the rotating shaft 7, and the return spring 20. Since the load application member 33 that engages with the connected flange member 22 is provided, the load application member 33 facilitates an operation of increasing the length of the coiled return spring 20 in the coil axis direction. It can be done quickly and work efficiency can be improved.

  In addition, the main body 31 of the extension device 30 is provided with adjusting means 60 and 63 that can adjust the size of the interval 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, 63 provided in the main body 31 includes a rough adjusting means 60. According to the rough adjusting means 60, the length dimension of the main body 31 can be roughly adjusted in a plurality of stages. And the load applying member 33 can be adjusted in a short time to adjust the size of the gap to an appropriate size.

  Further, the adjustment means 60, 63 provided in the main body 31 includes fine adjustment means 63 by screw mechanisms 61, 62, and according to this fine adjustment means 63, between the coupling member 32 and the load applying member 33. The interval can be set finely and accurately.

  Further, there are two fine adjustment means 63, and these fine adjustment means 63 are constituted by the left screw mechanism 61 and the right screw mechanism 62, so that the first and second main body members 34, 35 of the main body 31 are arranged. When rotated in one direction, the length dimension of the main body 31 in the axial direction of the rotary shaft 7 increases, and when the first and second main body members 34 and 35 are rotated in the opposite directions, the main body 31 in the axial direction of the rotary shaft 7. Since the length dimension of the main body 31 is reduced, the distance between the coupling member 32 and the load applying member 33 can be finely adjusted by selecting the rotation direction of the first and second main body members 34 and 35. Fine adjustment work to increase or decrease the size can be easily performed.

  Further, as described with reference to FIG. 5, the connecting portion 48 that connects the bolt shaft 46 that constitutes 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 interval between the engaging portion 33A for applying a load from the load applying member 33 is L1, and the connecting portion 48 and the operator apply a load by an operating force to the load applying member 33. The distance between the load acting portion 33B and the load acting portion 33B is L2, and the interval L1 is smaller than the interval L2. Therefore, the operating force applied to the load acting portion 33B by the operator is based on the lever principle. A large load is applied to the engaged portion 25 of the flange member 22 with which the engaging portion 33A is engaged. For this reason, even a strongly wound return spring is required to sufficiently extend. A large load is applied to the return spring 20 Azukasuru can.

  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 tightening tool 26 of FIG. 3 used for tightening the return spring 20 is inserted and engaged. Therefore, using the engaged portion 25 as it is, the length of the return spring 20 in the coil axial direction can be increased by the load applying member 33, and the return spring 20 or the flange member 22 is loaded with the load. It is not necessary to form a special portion for engaging the applying member 33.

  The coupling member 32 of the extension device 30 according to the embodiment described above is coupled to the rotary shaft 7 in a stationary manner in the axial direction of the rotary shaft 7. It is good also as what is fixed to the edge part in the side in which the flange member 21 in 20 is provided in the axial direction of the rotating shaft 7, and does not move. The end 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 coupled, and the stationary member 18.

  INDUSTRIAL APPLICABILITY The present invention can be used for an opening / closing device such as an over-sliding door device, in which a return spring by a coil spring is wound around a rotating shaft that rotates forward and backward to move the opening / closing body. .

DESCRIPTION OF SYMBOLS 1 Shutter curtain which is an opening-and-closing body 7 Rotating shaft 7A, 7B Rotating shaft member which comprises a rotating shaft 8, 9 Bracket which is a non-moving member 18 Non-moving members, such as a beam 20 Return spring 21, 22 Flange member 25 Engagement part 26 Winding Tightening tool 30 Elongating device 31 Main body 32 Coupling member 32B Coupling lacking portion 33 Load applying member 33A Engaging portion 33B Load acting portion 34 First main body member 35 Second main body member 35A Locked portion 37, 45 Nuts which are female screw members 38, 46 Bolt shaft which is a male screw member 48 Connection portion 52 Locking member 52A Locking portion 60 Coarse adjustment means 61 Left screw mechanism 62 Right screw mechanism 63 Fine adjustment means L1, L2 interval

Claims (10)

One end portion in the length direction is connected to the stationary member and the other end portion is the rotating member, and is wound around the outer periphery of the rotating shaft that rotates forward and backward to open and close the opening / closing body of the opening / closing device. The length of the return spring in the coil axial direction is a coil spring connected to the shaft, and the return spring force accumulated by tightening becomes at least part of the rotational force of the rotary shaft for opening and moving the opening / closing body. An extension device for a return spring for an opening and closing device used for extending
A coupling member that is fixedly coupled to the one end of the rotating shaft or the return spring in the axial direction of the rotating shaft, and the other end of the return spring that is connected to the coupling member. And a load applying member for applying a load in the direction of increasing the coil axial length of the return spring at the other end of the return spring. Stretching device.   2. The opening / closing device return spring extension device according to claim 1, wherein the coupling member and the load applying member are connected via a main body.   The extension device for a return spring for an opening / closing device according to claim 2, wherein the main body can be adjusted in the size of the interval between the coupling member and the load applying member in the axial direction of the rotating shaft. An extension device for a return spring for an opening / closing device, characterized in that an adjusting means is provided.   4. The opening / closing device return spring extension device according to claim 3, wherein the adjustment means includes a coarse adjustment means and a fine adjustment means.   5. The extension device for a return spring for an opening / closing device according to claim 4, wherein the main body includes a first main body member and a second main body member, and the rough adjustment means is configured to move the first main body member with respect to the first main body member. A plurality of locked portions formed in the axial direction of the rotary shaft on the second main body member which is movable in the axial direction of the rotary shaft; and the second main body member provided on the first main body member A return spring for an opening / closing device, comprising: a locking member that can be sequentially locked to the plurality of locked portions by moving in the axial direction of the rotating shaft. Stretching device.   6. The opening / closing device return spring extension device according to claim 4 or 5, wherein 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. And when one of the female screw member and the male screw member is rotated, the other is moved to change the length of the main body in the axial direction of the rotating shaft. An extension device for a return spring for a switchgear.   The return spring extension device for an opening / closing device according to any one of claims 4 to 6, wherein the rough adjustment means is provided at an intermediate position in the axial direction of the rotary shaft of the main body, and the rotary shaft of the main body is provided. Two fine adjustment means are provided at both ends in the axial direction. These fine adjustment means rotate the main body member constituting the main body in one direction and the main body in the axial direction of the rotation shaft. The length dimension of the main body member is increased, and when the main body member is rotated in the direction opposite to the one direction, the length dimension of the main body in the axial direction of the rotation shaft is decreased. An extension device for a return spring for an opening and closing device.   The extension device for a return spring for an opening / closing device according to any one of claims 2 to 7, wherein the load applying member is rotated around the main body at a connecting portion provided in a middle portion in the length direction of the load applying member. It is a rod-like member that is movably connected, and one end of the load applying member is an engaging portion that is engaged with the other end of the return spring, and the load applying The other end of the member serves as a load acting portion that applies a load to the load applying member, and an interval between the connecting portion and the engaging portion is between the connecting portion and the load acting portion. An extension device for a return spring for an opening / closing device, wherein the extension device is smaller than an interval therebetween.   The extension device for a return spring for an opening / closing device according to any one of claims 1 to 8, wherein a flange member connected to the return spring is provided at the other end of the return spring. Is provided with an engaged portion into which the load applying member is inserted and engaged, and when the load applying member is inserted into and engaged with the engaged portion, the other end portion of the return spring An extension device for a return spring for an opening / closing device, wherein the load applying member is engaged with the return spring.   10. The opening / closing device return spring extension device according to claim 9, wherein the engaged portion of the flange member also serves to insert and engage a tightening tool used when the return spring is tightened. An extension device for a return spring for an opening / closing device.

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