JP3991207B2 - Spring mounting structure for shutter winding shaft - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a spring mounting structure on a shutter winding shaft.
[0002]
[Prior art]
In general, a shutter take-up shaft includes a support shaft, a take-up wheel externally spaced on the support shaft, and a plurality of stays connecting the take-up wheels. A coil spring for accumulating the winding shaft in the winding direction is incorporated between the winding wheels. In the conventional attachment of the coil spring, one end of the coil spring is attached to the side of the wheel and the other end is attached to the support shaft using bolts and nuts.
[0003]
However, attachment using bolts and nuts requires mounting the bolts each time and tightening the nuts against the bolts, and it cannot be said that workability is good. Also, when the coil spring is set with a certain length of extension, if the twist is applied while the coil spring is extended, the coil spring will meander and the line resistance of the coil spring will increase, causing the winding to wind. There was a problem that the operating force of the intake shaft also increased. Furthermore, in the conventional mounting using bolts and nuts, since it is fixed at one location via a ring-shaped portion formed at the tip portion of the coil spring, the portion where the coil spring is not fixed moves, which is It also caused meandering.
[0004]
[Problems to be solved by the invention]
The present invention has been made in order to solve the above-described problems, and an object of the present invention is to improve the workability of a coil spring mounting operation in a shutter winding shaft. Another object of the present invention is to provide a mounting structure in which meandering of a coil spring does not occur even when the coil spring is extended by a certain length and twisted.
[0005]
[Means for Solving the Problems]
The technical means employed by the present invention in order to achieve the above-described object is that a spring is mounted on a winding shaft having a support shaft and a winding cylinder that is externally mounted on the support shaft, and a first wheel provided on the support shaft is provided. Coil springs are attached between the winding drum and a second wheel that rotates as a unit, and the first and second wheels each have a cylindrical portion around which the coil is wound on both ends of the spring. A locking hole is formed on the peripheral surface of the cylindrical portion , a locking member is provided on the peripheral surface of the cylindrical portion spaced circumferentially from the locking hole, and the end of the spring is folded. A hook portion formed by bending is locked in the locking hole, and the locking member is inserted between adjacent coil wires of the coils on both ends of the spring wound around the cylindrical portion. split of the spring both ends of the coil wound on Jo portion It regulates the movement of the dog length direction, characterized in that fitted with the spring both ends of the coil to the cylindrical portion between the locking member and the hook portion spaced from each other in the circumferential direction.
[0006]
Preferably, the locking member is a spring stopper having an opposing fitting piece, and a receiving hole is formed on a peripheral surface of the cylindrical portion at a portion spaced circumferentially from the locking hole, The spring stopper is inserted into the receiving hole so that at least one insertion piece is inserted between adjacent coils.
[0007]
In another preferred embodiment, the locking member is a protruding piece formed on the outer peripheral surface of the cylindrical portion, and the protruding piece is inserted between adjacent coils.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. The winding shaft is composed of a support shaft 1 and a winding drum 2 provided around the support shaft 1. The support shaft 1 is supported in a state in which rotation is restricted, and the shutter curtain is wound around the outer peripheral surface of the support shaft 1 when the winding drum 2 rotates. A coil spring for accumulating rotational force in the winding direction is incorporated in the winding shaft, and FIG. 1 is a view partially showing a spring incorporation portion in the winding shaft. In the illustrated example, the support shaft 1 is a square pipe, and the winding drum 2 has an octagonal outer shape, but the shape and configuration of the support shaft and the winding drum are not limited thereto.
[0009]
Between the support shaft 1 and the winding drum 2, a first wheel 3 provided on the support shaft 1, a second wheel 4 rotating integrally with the winding drum 2, and a first wheel 3 and a second wheel 4 are mounted. The coil spring 5 is provided, and the coil spring 5 is configured to store a rotational force by rotating the winding drum 2.
[0010]
More specifically, the first wheel 3 has a substantially cylindrical main body having openings at both ends, and several turns on one end side of the coil spring 5 are wound around the outer peripheral surface of the cylindrical main body. It is supposed to be. One opening 30 is formed in a small opening as a square hole through which the support shaft 1 is inserted, and the support shaft 1 made of a square pipe is inserted therethrough. The other opening is formed as a large opening, and the support shaft 1 is inserted therethrough with a clearance.
[0011]
The second wheel 4 is integrally formed from a large-diameter portion 40 having an octagonal outer shape corresponding to the octagonal inner wall surface of the winding drum 2 and a small-diameter portion 41 having a substantially cylindrical shape, and both ends are open. It has become a shape. Several turns on the other end side of the coil spring 5 are wound around the outer peripheral surface of the small diameter portion 41. The outer peripheral surface of the large-diameter portion 40 is in close contact with the inner wall surface of the winding drum 2 so that the second wheel 4 and the winding drum 2 rotate as a unit. The dimensions of the openings at both ends of the second wheel 4 are sufficiently larger than the cross-sectional outline of the support shaft 1, and the support shaft 1 is inserted with a clearance.
[0012]
Both end portions of the coil spring 5 formed by winding a single wire in a coil shape are bent at a substantially right angle with respect to the extending direction of the wire and are formed in the hook portion 50. A locking hole 6 is provided in the peripheral surface of the small diameter portion 41 of the first wheel 3 and the second wheel 4, and the hook portion 50 of the coil spring 5 is locked to the locking hole 6. The main body of the first wheel 3 and the small-diameter portion 41 of the second wheel 4 are short cylinders, and the lengths of these peripheral surfaces are wound from 2 to 3 turns of the coil spring 5 (resulting in the end turn). It is dimensioned so that it can be worn. When the coil spring 5 is twisted, the coil of the end winding is brought into close contact with the peripheral surface by reducing the diameter of the coil.
[0013]
On the peripheral surface of the main body of the first wheel 3 and the small diameter portion 41 of the second wheel 4, a receiving hole 7 made of a square hole is formed at a position facing the locking hole 6 (positioned at 180 degrees). A spring stopper 8 is fitted into the receiving hole 7. The spring stopper 8 is a substantially U-shaped member having a cross-sectional view having opposed fitting pieces 80, 81. In a natural state (no external force is applied), the opposed fitting pieces 80, 81 are at the tip thereof. It is slightly expanded toward the front. On the outer surfaces of the fitting pieces 80, 81, inclined protrusions 82 are formed extending in an inclined manner from the distal end toward the proximal end. Further, as apparent from the left diagram of FIG. 3, the lateral width dimension of the proximal end side of the fitting pieces 80 and 81 is slightly wider than that of the distal end side, and the step portion 83 is provided on the side portion of the fitting pieces 80 and 81. Forming. The spring stopper 8 is made of metal, is a spring material as a whole, and is elastically attached to the receiving hole 7 (so-called snap-in).
[0014]
Here, the assembly of the coil spring 5 will be described. First, several coils (end winding) on both ends of the coil spring 5 are wound around the peripheral surfaces of the first wheel 3 and the small diameter portion 41 of the second wheel 4. Then, the hook portions 5 at both ends of the coil spring 5 are locked in the locking holes 6. Next, the spring stopper 8 is fitted into the receiving hole 7. In the spring stopper 8, one of the fitting pieces 80 is wound with the first coil 51 and the second winding of the coil spring 5 wound around the peripheral surfaces of the small diameter portions 41 of the first wheel 3 and the second wheel 4. While being inserted between the coils 52 of the eyes, it is fitted into the receiving hole 7. When inserting the spring stopper 8, the inclined piece 82 serves as a guide, and after the stepped portion 83 abuts the circumferential surface and the spring stopper 8 is inserted into the receiving hole 7, the inclined piece 82 contacts the inner wall of the circumferential surface. It will prevent it from coming off by touching it. After the spring stopper 8 is mounted, the first coil 51 comes into contact with the inner surface of the fitting piece 80, whereby the movement of the first coil 51 in the length direction of the spring 5 is restricted. In this manner, the end portions of the coil spring 5 are locked to the peripheral surfaces of the small-diameter portions 41 of the first wheel 3 and the second wheel 4 at two positions facing each other in the circumferential direction.
[0015]
In FIG. 1, a configuration in which two coil springs 5 are continuously provided is illustrated, but in the connection portion, the other (on the right side in the drawing) is connected to the first wheel 3 to which one coil spring 5 is attached. (The left side in the figure) is incorporated so that the second wheel 4 to which the coil spring 5 is attached is rotatably supported. Specifically, as shown in FIGS. 1 and 2, sub wheels 31 and 42 are connected to the square hole side of the first wheel 3 and the large diameter portion 40 side of the second wheel 4, respectively. A plurality of balls 9 are interposed between the first wheel 3 integrated with 31 and the second wheel 4 integrated with the sub wheel 42, and the first wheel 3 and the second wheel 4 are interposed via the balls 9. The two wheels 4 are rotatable relative to each other, and the second wheel 4 rotates relative to the first wheel 3 when the winding drum 2 rotates.
[0016]
In FIG. 1, a third wheel 10 is rotatably supported with respect to the first wheel 3 to which the end of the left coil spring 5 is attached. Specifically, a sub wheel 32 having substantially the same shape as the first wheel is connected to the square hole side of the first wheel 3, and the third wheel 10 has a large diameter portion of the second wheel symmetrically formed. The outer peripheral surface is in close contact with the inner wall of the winding drum 2. A plurality of balls 9 are interposed between the first wheel 3 and the third wheel 10 in which the sub wheel 32 is integrated, and the first wheel 3 and the third wheel 10 are rotatable with respect to each other via the balls 9. The third wheel 10 rotates relative to the first wheel 3 when the winding drum 2 rotates.
[0017]
The two second wheels 4 and the third wheel 10 are set with their positions fixed via cut-and-raised parts 11 projecting from the inside of the winding drum 2. The cut and raised portion 11 is formed on the inner wall of the winding drum 2 in consideration of the elongation of the coil spring 5. The coil spring is mounted between the first and second wheels in a state where the coil spring is previously extended by a predetermined length. This is because the coil spring used for the winding shaft is composed of a close contact spring in which adjacent windings are in close contact with each other in a natural state, and the operation when winding the coil spring tends to be heavy due to the frictional force of contact. is there. Further, when the coil spring is wound and stored, the winding diameter is reduced with an increase in the number of turns, the entire length of the coil spring is lengthened, the space between the wires is cramped, and the frictional force is increased. Therefore, by setting the coil spring in a state where the coil spring is extended in advance by the maximum extension when the coil spring is wound (the length obtained by multiplying the number of twists of the coil spring when fully closed) by the wire diameter, Since a gap is formed between them, even when a coil spring is wound, it is possible to prevent adhesion between adjacent windings, so that the winding operation does not become heavy. The configuration for extending and setting the coil spring in advance is not limited to the cutting and raising as shown in the figure, but a cylindrical shape having a predetermined dimension in consideration of the extension of the spring between the pair of the first wheel and the second wheel. The spacer may be provided. A specific example of the configuration of the cylindrical spacer will be described with reference to FIG. 5. The coil spring 5 is mounted between the small diameter portions 41 of the first wheel 3A and the second wheel 4A. The means for mounting the coil spring 5 is the same as that described above, and the same reference numerals are given to the same members, and the above description can be referred to for the detailed description. The second wheel 4A is rotatable with respect to the inner wheel 40A via the ball 9, and a cylindrical spacer 70 is provided between the small diameter portion 30A of the first wheel 3A and the inner wheel 40A. is there. In this case, it is not necessary to cut and raise the inner wall of the winding drum.
[0018]
In the present invention, the coil spring 5 is stably attached in a state in which several turns at both ends of the coil spring 5 are wound around the peripheral surface of the main body of the first wheel 3 and the small diameter portion 41 of the second wheel 4. When the coil spring 5 is twisted in a state in which the coil spring is extended, it is possible to prevent as much as possible the meandering of the coil spring.
[0019]
In FIG. 1 to FIG. 3, by using a spring stopper, the movement of the coil spring 5 wound around the peripheral surface of the cylindrical portion is restricted from moving in the length direction at a portion separated from the locking hole 6. Although what was supported by the surrounding surface of a cylindrical part was shown, you may achieve this in an aspect as shown in FIG. FIG. 4 shows another embodiment of the second wheel 4, and substantially the same members as those in the embodiment of FIGS. 1 to 3 are denoted by the same reference numerals. On the peripheral surface of the small-diameter portion 41 of the second wheel 4, a projection 12 is cut and raised instead of the receiving hole at a portion facing the locking hole 6. In the state where several turns of the coil spring 5 are wound around the peripheral surface of the small diameter portion 41, the protrusion 12 is positioned between the first and second turns of the end of the coil spring so that the coil spring Restrict movement in the length direction. Since the diameter of the coil spring is reduced by twisting the coil spring, the diameter of the coil spring is set slightly larger than the peripheral surface of the small-diameter portion 41, and the end portion of the coil spring is wound around the peripheral surface. When the coil spring is wound, the diameter of the coil spring is reduced, and the coil spring is in close contact with the peripheral surface, so that the protrusion 12 does not hinder the attachment of the coil spring.
[0020]
In the illustrated example, the arrangement is shown in which the locking hole 6 and the receiving hole 7 or the locking hole 6 and the protrusion 12 are positioned at 180 degrees from each other (this is preferable), but these positions are separated to some extent. It only has to be. Further, a plurality of receiving holes and protrusions may be provided. In this case, it is desirable that the locking holes and receiving holes, and the locking holes and protrusions are arranged at equal intervals in the circumferential direction.
[0021]
【The invention's effect】
In the present invention, since the coil spring is mounted without using bolts and nuts, the mounting workability is good. In particular, in the case of using a spring stopper, workability is good because only the end of the spring is locked and the spring stopper is inserted. Several turns (coils) of the coil spring are wound around the circumferential surface of the cylindrical portion at both ends, and the hook portion of the spring end is locked in the locking hole formed in the cylindrical portion, and the spring Is locked to the cylindrical portion even at a portion spaced from the locking hole in the circumferential direction of the cylindrical portion, so that the coil spring can be stably attached. Therefore, even when the coil spring is extended by a certain length and twisted, the meandering of the coil spring can be prevented as much as possible. While this can reduce the resistance between the coil spring windings, the coil spring does not meander when the winding shaft rotates, so the spring moment diagram becomes smooth and the spring moment is effective. Can be transmitted.
[Brief description of the drawings]
FIG. 1 is a partial view of a winding shaft according to the present invention, and shows a coil spring mounting structure.
FIGS. 2A and 2B show a first wheel and a second wheel assembled via balls, a right view is a cross-sectional view seen from the front, and a left view is a side view of the right view seen from an arrow direction.
FIG. 3 is a view showing a spring stopper.
FIG. 4 is a view showing another embodiment of the second wheel.
FIG. 5 is a view showing another embodiment in which a coil spring is extended in advance.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Support shaft 2 Winding drum 3 1st wheel 4 2nd wheel 41 Small diameter part 5 Coil spring 50 Locking part 6 Locking hole 7 Receiving hole 8 Spring stopper 12 Protrusion

Claims (4)

In the mounting structure of the spring in the winding shaft having the spindle and the winding drum that is externally mounted on the spindle,
A coil spring is attached between a first wheel provided on the support shaft and a second wheel that rotates integrally with the winding drum,
Each of the first and second wheels has a cylindrical portion around which coils on both ends of the spring are wound,
A locking hole is formed on the circumferential surface of the cylindrical portion, and a locking member is provided on the circumferential surface of the cylindrical portion spaced apart from the locking hole in the circumferential direction.
A hook formed by bending the end of the spring is locked in the locking hole, and the locking is performed between adjacent coil wires of the coils on both ends of the spring wound around the cylindrical portion. The movement of the coil on both ends of the spring wound around the cylindrical part by inserting a member is restricted in the spring length direction, and the hook part and the locking member separated from each other in the circumferential direction A spring mounting structure for a winding shaft , wherein coils at both ends of the spring are mounted on the cylindrical portion . The locking member according to claim 1, wherein the locking member is a spring stopper having an opposing fitting piece, and a receiving hole is formed on a peripheral surface of the cylindrical portion at a portion spaced circumferentially from the locking hole. A spring mounting structure, wherein the spring stopper is inserted into the receiving hole so that at least one insertion piece is inserted between adjacent coil wires . In claim 2, an inclined piece extending in an inclined manner toward the rear is formed on the outer surface of the fitting piece, and a step portion is formed on a side surface of the fitting piece, and a spring stopper is provided. When inserting, the inclined projecting piece serves as a guide, and the stepped portion comes into contact with the circumferential surface, and after the spring stopper is inserted into the receiving hole, the inclined projecting piece comes into contact with the inner wall of the wheel circumferential surface. The spring mounting structure is characterized in that it prevents it from coming off. 2. The spring mounting structure according to claim 1, wherein the locking member is a projecting piece formed on the outer peripheral surface of the cylindrical portion, and the projecting piece is inserted between adjacent coil wires .

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