JPH0356585Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is a method of attaching a rollable and unrollable cloth sheet to the eaves of buildings such as shops facing the street to avoid strong sunlight. The present invention relates to a device that constantly biases a bendable arm supporting a stretched portion of a seat in the direction of extension of the seat in a sunshade used.

[Conventional technology]

As is well known, the biasing device applied to this type of arm usually uses a tension coil spring with hooks at both ends inserted inside the arm. The hook at one end of the tension coil spring is hooked to the base of the first arm on the side of the sheet winding shaft among the first arm and the second arm which are connected in a bendable and extensible manner. part) is housed inside the first arm, and the straight part at the other end (or the wire connected to it) is placed inside the pivot provided at the connection part between the first arm and the second arm (in the bending direction of the arm). second side through the opposite side)
It is inserted into the inside of the arm, and the hook at the other end is hooked onto a locking pin provided in the middle of the second arm to suspend it.

[Problem that the invention attempts to solve]

However, in the arm biasing device using a tension coil spring as described above, when assembling and installing a sunshade, the cylindrical part of the coil spring is passed through the internal space of the first arm, which is very narrow and long, and the spring After gropingly hooking the hook provided at the tip of the second arm onto the locking pin in the middle of the second arm, pull the hook at the other end from the base end of the first arm to the outside while the tension coil spring is fully extended. The user must pull it out and hook it onto the pivot pin at the base, which is a tedious assembly operation.

In addition, in terms of spring characteristics, in the case of a tension coil spring, if the initial tension of the spring is not set high, the hook may easily come off the pin, so an unnecessarily large initial load is required for the arm's bending and stretching movements. Moreover, when the bias is actuated, the tension of the straight part of the spring acts as lateral pressure on the pivot that connects the first arm and the second arm, so that the tension is adjusted to the change in the bending angle of the arm. There was also the problem that it was difficult to gain support.

The purpose of this invention is not only to make it very easy to attach the spring to the arm, but also to make the structure of the spring itself simple and inexpensive to produce.Also, in terms of spring characteristics, the initial load can be small. It is an object of the present invention to provide a completely ideal arm biasing device that can obtain a biasing force that adapts to changes in the refraction angle of the arm.

[Means for solving problems]

The arm biasing device according to the present invention was devised to achieve the above-mentioned object, and the first arm and the second arm of the sunshade are formed into a tubular shape, and are attached to each other by a pivot so that they can be bent and extended. A cylindrical part of a torsion coil spring is fitted around the outer periphery of the pivot shaft, and a long straight part having a length sufficient to be bent by an external force is provided at both ends of the cylindrical part. The linear portions are inserted into the tubes of the first arm and the second arm, and the ends of each linear portion are brought into contact with the inner wall surfaces of both arms on the opposite side to the direction of bending.

[Example of idea]

Hereinafter, the present invention will be explained in detail based on the drawings of the embodiment, starting with FIG. 3 which shows the entire sunshade.
In the drawing, 1 is a sunshade sheet, 2 is a winding shaft that holds the sheet 1 so that it can be wound up and fed out, 3 is a front frame attached to the tip of the sheet 1, and 4 is a front frame connected to the sheet 1. A front sag is attached to 3, 5 is a bendable arm that connects the front frame 3 to its tip and advances and retreats in a predetermined direction, and 6 supports the winding shaft 2 horizontally and rotatably. A pair of left and right brackets, the base ends of the arms 5, 5 are pivotally attached to the lower part of the brackets 6, 6 via connecting bodies 7, 7 so as to be rotatable in the left and right direction, and these structures are similar to those of conventional sunshades. However, instead of using a tension coil spring as the spring for constantly biasing the arm 5 in the bending direction, the first arm 5a constituting the arm 5 as shown in FIGS. 1 and 2 is used. A torsion coil spring 8 is incorporated in the connecting portion of the second arm 5b.

1 and 2 show an example of the mounting structure of the torsion coil spring 8, and in the case of this embodiment,
Joint fittings 9 and 10 are provided at the tip of the first arm 5a and the base of the second arm 5b to connect both arms 5a and 5b in a bendable and extensible manner.
The first arm 5a and the second arm 5b are pivotally connected to be rotatable in the lateral direction by a pivot shaft 11 penetrating through the two prongs 9a and 10a of the pivot shaft 11. The cylindrical portion 8a of the torsion coil spring 8 is loosely fitted onto the outer periphery of the roller 12, and the straight portions 8b, 8b connected to both ends of the cylindrical portion 8a of the spring are made longer than normal dimensions, that is, by external force. The long straight portions 8b, 8b are formed to have a long enough length to curve when
are inserted into the tubes of the first arm 5a and the second arm 5b, respectively, and cylindrical resin blocks 13, 13 are attached to the ends of the straight parts 8b, 8b and brought into contact with the inner wall surfaces 5c, 5d. Arms 5a and 5b are always biased in the opposite direction to the bending direction.

Since the arm biasing device according to the present invention has the above-described structure, when winding up and unwinding the sunshade sheet 1, the built-in motor of the winding shaft 2 or an alternative external drive device (not shown) is used. When the winding shaft 2 is rotated in the direction in which the sheet 1 is fed out, the arms 5a and 5b supporting the front frame 3 are bent by the biasing force of the torsion coil spring 8 as the tensioned portion of the sheet 1 is relaxed. If the front frame 3 is pushed forward while gradually transitioning from the state to the extended state, the sheet 1 is extended as shown by the solid line arrow, and the take-up shaft 2 is rotated in the direction shown by the dotted line arrow, the situation is reversed to the above case. Then, the arm 5 is twisted to move from the extended state to the bent state against the elasticity of the coil spring 8, and the sheet 1 can be moved backward and wound around the circumferential surface of the shaft.

Moreover, the torsion coil spring 8 has a long straight portion 8.
b, 8b are provided, at the initial stage when the arms 5a, 5b are bent from the extended state as shown in FIG. Due to the external force, the long straight portions 8b first begin to bend as shown by the dotted lines in FIG. 2, and as the degree of bending becomes deeper, the cylindrical portion 8a is sequentially compressed. Also, when the arms 5a, 5b extend from the bent state, the repulsive force of the cylindrical part 8a does not work directly, and at the time of their initial movement, the long straight parts 8b, 8b curve in the same manner as described above, and then gradually become cylindrical. The portion 8a is operated.

[Effect of idea]

The sunshade arm biasing device according to this invention uses a torsion coil spring as a spring for biasing the arm, and the cylindrical part of the torsion coil spring is fitted onto the outer periphery of a pivot that connects the first arm and the second arm.
Providing a straight line part connected to both ends of the cylindrical part with a length sufficient to be bent by an external force, and inserting this straight part into the tubes of the first arm and the second arm,
Since the end of each straight section is in contact with the inner wall surface on the opposite side of the bending direction of both arms, when assembling a spring into the arm, the tedious assembly operation is not required as with conventional biasing devices using tension coil springs. There is no need,
It goes without saying that the work of attaching the spring to the arm is greatly facilitated, and the structure of the spring itself is simple, reducing manufacturing and maintenance costs.

Furthermore, in terms of spring characteristics, since there is no need to tension the spring by hooking a hook or the like onto a locking pin, the initial tension of the spring can be set to the minimum necessary level.

In addition, since the straight part of the torsion coil spring is long, when the initial load is applied when the arm is flexed and extended, the load is applied to the cylindrical part of the spring after the straight part inserted into the tube curves. Therefore, there is no sudden bending and stretching, and a natural and smooth bending and stretching action that adapts to changes in the bending angle of the arm is achieved.As a result, when the sunshade is extended, no undue force is applied to the seat. Moreover, the sheet does not loosen during winding, and winding and unwinding can be performed smoothly.

Furthermore, since each arm is formed into a tubular shape and the straight part of the torsion coil spring is inserted inside the arm, the straight part does not touch other objects such as the seat, and the straight part is long. can also ensure safety.

[Brief explanation of the drawing]

Fig. 1 is a front view of the main parts showing an example of a specific implementation structure of the arm biasing device according to the present invention, Fig. 2 is a cross-sectional plan view of the main parts, and Fig. 3 is a diagram showing a structure in which the arm biasing device of the present invention is incorporated. It is a perspective view of a sunshade. 1...Sheet, 2...Take-up shaft, 3...Front frame, 4
... Front hanging, 5 ... Arm, 5a ... First arm, 5b ... Second arm, 5c, 5d ... Inner wall surface, 6 ... Bracket, 7 ... Connecting body, 8 ... Torsion coil spring, 8a ... ...Cylindrical part, 8b...Straight line part, 9, 10...Joint fittings, 9a, 10a...Two prongs, 11...Pivot, 12...Roller, 13...
...Resin block.

Claims (1)

[Scope of utility model registration request] The first arm 5a and the second arm 5b are formed into a tubular shape and are connected to each other by a pivot shaft 11 so as to be bendable and extensible. Elongated straight parts 8b, 8b are connected to both ends of the part 8a and have a sufficient length to be bent by external force, and the straight parts 8b, 8b are connected to the first arm 5a and the second arm. 5b
, and insert the ends of each straight portion 8b, 8b into the inner wall surface 5 on the opposite side to the bending direction of both arms 5a, 5b.
An arm biasing device for an awning, characterized in that it is brought into contact with the arms of the sunshade.