JPH0552194U - Balance shutter - Google Patents

Abstract

(57) [Abstract] [Purpose] A long-life and inexpensive balance that is compatible with changes in the winding diameter of the shutter that accompanies opening and closing of the shutter and that can be opened and closed without the shutter always contacting the guide. Providing a shutter. [Structure] A shaft 3 serving as a winding core of a balance shutter is eccentrically supported at a predetermined lower position via a movable piece 4. The stoppers 5a and 5b are provided so that the hanging start point when the shutter is fully closed is directly above the rail 9 and the hanging start point when the shutter is fully open is immediately above the rail 9, and the shaft 3 is at a predetermined angle. If the swing range is set freely, the restoring torque of the coil spring 8 causes the shaft 3 to move.
Rocks, and the shutter drooping start point is almost always located above the rail 9.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an improvement of a balance shutter configured to easily open and close the shutter by utilizing the restoring force of a coil spring.

[0002]

[Prior Art]

 Currently, most buildings have shutters at the openings. In particular, for small and medium-sized buildings, inexpensive balance shutters are often used because they are easy to open and close in terms of equipment costs and costs.

In a conventional balance shutter, a bracket is arranged above an opening of a building, a shaft as a winding core of the shutter is horizontally installed inside the bracket, and the shutter upper end is attached to a pulley pivotally supported by the shaft. , The other end of the coil spring is fixed to the shaft, and the other end is fixed to the pulley, and the torque around the shaft generated by the weight of the shutter that hangs down the opening of the building is offset by the restoring torque of the coil spring. The load on the operator during the opening and closing operations was very small.

However, in the conventional configuration, the shaft that serves as the winding core of the shutter is fixed, and it has not been taken into consideration that the winding diameter changes depending on the winding amount of the shutter. That is, the winding diameter of the shutter changes depending on the degree of opening and closing of the shutter, and the shaft, which is the winding core, is fixed even though the position where the shutter separates from the winding portion moves back and forth. As shown in FIG. 7, the front surface of the shutter 21 comes into contact with the guide portion 23 of the rail 22 near the fully opened state (a), and the rear surface of the shutter 21 conversely has the guide portion of the rail 22 near the fully closed state (b). It was supposed to contact 23.

When the shutter comes into contact with the guide portion, friction naturally occurs, and when the shutter is opened and closed, the load on the operator is increased and noise is also increased, which is a problem. Also, since the shutter made of steel plate and heavy is supported only by the left and right guide parts, the center part is curved and the slat is severely worn, and the life of the entire shutter is shortened.

On the other hand, although a winding device as disclosed in Japanese Utility Model Laid-Open No. 2-147594 has been devised, there is a problem that the shaft moving mechanism becomes complicated and the manufacturing cost becomes high.

[0007]

[Problems to be solved by the device]

 An object of the present invention is to provide a long-life and inexpensive balance shutter which is adapted to cope with the change of the winding diameter of the shutter due to the opening and closing of the shutter and can be opened and closed without the shutter always contacting the guide portion. The purpose is to reduce the noise to the neighborhood.

[0008]

[Means for Solving the Problems]

 The gist of the present invention, which has solved such a problem, is to wind a shutter around a pulley that is rotatably supported by a shaft that is horizontally installed above an opening of a building, and to wind the shaft and the pulley at both ends of a coil spring. In the balance shutter that cancels the torque around the shaft caused by the weight of the shutter part hanging in the opening of the building with the restoring torque of the coil spring, the shaft can be swung forward and backward. Stopper that eccentrically supports it at a predetermined position below the shaft and determines the front swing end point so that the shutter start point when the shutter is fully closed is directly above the rails on the left and right of the shutter at the front swing end point. In addition, the start point of the shutter droop when the shutter is fully open is the In balance shutter characterized that you provided a stopper for determining the swinging end point of the backward to come towards.

[0009]

[Action]

 The balance shutter of the present invention eccentrically supports a shaft serving as a winding core at a predetermined lower position, and the shaft is swingable within a predetermined angle range in the front-rear direction. Of course, the torque around the shaft caused by the weight of the hanging portion of the shutter is offset by the restoring torque of the coil spring, and the moment around the shaft is balanced, so the shutter can roll up or hang freely. There is no.

Describing the operation thereof with reference to FIG. 3, when the number of wound shutters W is large, the weight of the shutters causes the shaft O to fall backward, and the movable piece C abuts against the stopper P2 to be locked. .. The coil spring generates a restoring torque Ts that cancels the torque around the shaft O generated by the weight of the hanging portion of the shutter, and the restoring torque Ts acts to rotate the shaft O in a reaction manner (Ts ′). However, since the shaft O is eccentrically supported through the movable piece C, the torque T around the support shaft A of the movable piece is always acting on the shaft O. Therefore, when the weight of the shutter W wound around the shaft O becomes smaller, the shaft O swings forward by the torque T, and the movable piece C is locked at the position where it abuts on the stopper P1. The drooping start point of S is always located almost directly above the guide portion G. That is, the shutter S can move up and down along the rail without contacting the guide portion G regardless of the winding diameter of the shutter.

[0011]

【Example】

 Examples will be described with reference to the following drawings. 1 is a partially cutaway perspective view showing the first embodiment, FIG. 2 is an explanatory view showing the first embodiment, FIG. 3 is an explanatory view showing the operation, FIG. 4 is an explanatory view showing the second embodiment, and FIG. Is a cross-sectional view of an essential part showing a second embodiment, FIG. 6 is a front view showing an example of a movable piece, and FIG. 7 is an explanatory view showing a conventional example.

First Embodiment (see FIGS. 1 and 2) In the present embodiment, a bracket 2 is arranged above an opening 1 of a building, and a shaft 3 is horizontally installed between both side walls of the bracket 2. There is. The shaft 3 is fixed to the other end 4b of a movable piece 4 which is rotatably attached to a lower predetermined position 4a. That is, the shaft 3 is swingable around the movable shaft 14 which rotatably supports one end 4a of the movable piece 4. Further, stoppers 5a and 5b for limiting the swing angle range of the movable piece 4 are provided on the side wall of the bracket 2 so as to project. Further, in the present embodiment, the movable shaft 14 is slightly ahead of the shaft position at the forward swing end point.

The stopper 5a determines the forward swing end point of the movable piece 4, and at the forward swing end point, the drooping start point of the slat 7 when the shutter is fully closed is the true position of the rail 9. It is positioned so that it is above. The stopper 5b determines the rear swing end point of the movable piece 4, and is positioned so that the drooping start point of the slat 7 when the shutter is fully opened is directly above the rail 9 at the rear swing end point. .. Reference numeral 10 is a guide portion.

A pulley 6 is pivotally supported near both ends of the shaft 3, and an upper end of a shutter 7 is attached to the pulley 6. A coil spring 8 having one end fixed to the shaft 3 is attached to each pulley 6, and a restoring torque that balances the torque around the shaft 3 due to the weight of the hanging portion of the shutter 7 is constantly generated.

Second Embodiment (See FIGS. 4 to 6) As in the present embodiment, the movable piece 11 is provided with the slit 12, and the pin 13 protruding from the side wall of the bracket 2 is slid in the slit 12. Therefore, the swinging range of the shaft 3 can be restricted. Further, the movable piece 11 has a shape as shown in FIG. 6 and may be manufactured by press molding. At the time of molding, the peripheral edge of the movable piece 11 is slightly bent to reinforce the strength and smooth the operation. It is good to plan. Reference numeral 15 is a shaft mounting hole, and 16 is a movable shaft mounting hole.

The present invention is not limited to the above embodiments. For example, a spring that resists the swing of the movable piece may be stretched so that the separated position of the shutter is always positioned just above the guide portion. When mounting, insert the shaft in the bracket, and mount the shaft at a position eccentric to the rear of the movable shaft by e when wound.

[0017]

[Effect of the device]

 As described above, according to the present invention, the tangent line of the winding circumference automatically matches the shutter core due to the strength of the repulsive force of the spring regardless of the winding diameter, and the shutter has rail and guide parts regardless of the opening and closing degree. It is in a state of hanging from just above. Therefore, since the shutter does not come into contact with the guide portion when the shutter is opened and closed, friction is not generated, noise can be reduced, wear of the slats can be suppressed, and a long-life shutter can be obtained. Moreover, since the mechanism is simple, it can be manufactured at low cost and maintenance is easy. Further, since the friction between the shutter and the guide portion is small, the restoring torque of the coil spring can be efficiently used, and the labor burden on the operator due to opening and closing of the shutter can be reduced.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a first embodiment.

FIG. 2 is an explanatory diagram showing a first embodiment.

FIG. 3 is an explanatory diagram showing an operation.

FIG. 4 is an explanatory diagram showing a second embodiment.

FIG. 5 is a cross-sectional view of essential parts showing a second embodiment.

FIG. 6 is a front view showing an example of a movable piece.

FIG. 7 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 1 Building opening 2 Bracket 3 Shaft 4 Movable piece 5 Stopper 6 Pulley 7 Shutter 8 Coil spring 9 Rail 10 Guide part 11 Movable piece 12 Slit 13 Pin 14 Movable shaft 15 Shaft mounting hole 16 Movable shaft mounting hole 21 Shutter 22 Rail 23 Guide

Claims (1)

[Scope of utility model registration request] 1. A shutter is wound around a pulley rotatably supported by a shaft extending horizontally above an opening of a building, and both ends of a coil spring are attached to the shaft and the pulley, respectively. In a balance shutter that cancels the torque around the shaft caused by the weight of the shutter portion that hangs down in the opening with the restoring torque of the coil spring, the shaft is eccentrically supported at a predetermined position below the shaft so as to be swingable in the front-rear direction. ,
At the front swing end point, a stopper is provided to determine the front swing end point so that the shutter drooping start point when the shutter is fully closed is directly above the rails arranged on the left and right sides of the shutter, and the shutter is set at the rear swing end point. A balance shutter comprising a stopper for determining a rear swing end point so that a shutter drooping start point when the shutter is fully opened is directly above the rail.