JPH041214Y2 - - 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 and extensible arm that supports a stretched portion of a seat in the direction of extension of the seat in an awning used in the sunshade.

[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, and in most cases, Of the first arm and second arm that are connected in a bendable and extensible manner, 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, and the cylindrical portion (coil portion) of the spring is is stored inside the first arm, and the straight part at the other end (or the wire connected to this) is placed inside the pivot provided at the connection part between the first arm and the second arm (on the opposite side to the bending/extending direction of the arm). ) into the second arm, and insert the hook at the other end into the second arm.
It has a structure in which it is hung on a locking pin provided in the middle of the arm.

[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 the sunshade, a locking pin is provided in the middle part of the first arm in advance, and the inside of the tube of the first arm is very narrow and long. Pass through the cylindrical part of the tension coil spring, and after fumblingly hook the hook provided at the tip of the spring onto the locking pin in the middle part of the second arm, extend the tension coil spring to its maximum extent. It was necessary to perform a troublesome assembly operation in which the other hook was pulled out from the base end of the first arm and hooked onto the pivot pin at the base end.

Moreover, when the arm is bent in accordance with the winding of the sheet, the tension of the tension coil spring increases exponentially as the bending angle of the arm becomes deeper. When extending the sheet, the repulsive force of the tension coil spring was stronger than necessary, which caused the problem that abnormal tension was applied to the sheet.

The purpose of the present invention is to hook the hook of the coil spring to an existing pivot pin that runs through the tension coil spring over the entire length of the arm and supports the base end of the first arm and the tip of the second arm. As a result, a tension coil spring for biasing the arm in the extension direction is stretched between the bracket and the front frame, and the arm can be assembled and attached with extremely simple operations. Moreover, it is an object of the present invention to provide an arm biasing device that operates so that an appropriate repulsion force is maintained in a tension coil spring when the arm is bent as the sheet is rolled up.

[Means for solving problems]

This invention was devised to achieve the above object, and includes a first arm rotatably connected to the proximal end of the sunshade by a pivot pin, and a front frame connected to the distal end by the pivot pin. In the arm that is flexibly and extensibly connected to the second arm by means of a pivot via a joint fitting, the hook at one end of the tension coil spring is hooked to the pivot pin at the proximal end of the first arm, and the cylindrical portion of the coil spring is is inserted into the pipe of the first arm, and the straight part of the other end connected to the cylindrical part of the coil spring is passed through the pipe of the second arm, and the hook provided at the tip of the straight part is connected to the pivot of the tip of the second arm. A cam portion is provided on the bearing portion of the joint fitting of the second arm and has a radius of curvature that gradually decreases as the bending angle of the arm becomes smaller, and the first arm and the second arm in the straight portion are hooked and connected to the pin. It is characterized in that the portion between the arms is in contact with the circumferential side of the cam portion.

[Example of idea]

Hereinafter, the present invention will be explained in detail with reference to the drawings of the embodiment, starting with FIG. 3, which shows the entire awning.
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. 3 is a front hanger 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, 6 are left and right arms that support the winding shaft horizontally and rotatably. With a pair of brackets,
The base end of the arm 5 is pivotally attached to the lower part of the bracket 6 via a connecting body 8 by a pivot pin 7 so as to be rotatable in the left and right direction, and the structure thereof is basically the same as that of a conventional sunshade. As shown in FIGS. 1 and 2, the spring for constantly biasing the arm 5 in the extension direction is one tension coil spring extending over the entire length of the first arm 5a and second arm 5b that constitute the arm 5. 9 is inserted.

FIGS. 1 and 2 show an example of a mounting structure for the tension coil spring 9, and in the case of this embodiment,
Joint metal fittings 10 and 11 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.
Pivot 1 penetrating through shaft holes 10a and 11a of 0 and 11
2, the first arm 5a and the second arm 5b are pivotally connected to be rotatable in the lateral direction, and the bearing part of the joint fitting 11 on the second arm 5b side has a bending angle (narrow angle) of the arm. A cam portion 11b is provided whose radius of curvature gradually decreases as the angle Q) becomes smaller. Further, tube end support fittings 13a and 13b are fixed to the base end of the first arm 5a and the distal end of the second arm 5b, and the base end of the first arm 5a is connected to the bracket 6 by a pivot pin 7. On the body 8, the distal ends of the second arms 5b are rotatably connected to mounting fittings 15 on the front frame 3 side by pivot pins 14, respectively.

The tension coil spring 9 for biasing the arm 5 has a hook 17 at one end of the spring hooked on a pivot pin at the base end of the first arm 5a, and the cylindrical portion 9a of the coil spring 9 is attached to the first arm. 5a, and extend the straight portion 16 at the other end connected to the cylindrical portion 9a of the coil spring 9;
A pivot 12 connecting the first arm 5a and the second arm 5b in a bendable and extensible manner is passed through the tube of the second arm 5b through the circumferential side opposite to the arm bending direction, and the hook 18 at the other end is attached to the second arm 5b. The arms 5a and 5b are connected by being hooked onto the pivot pin 14 at the tip, and the 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 to When the take-up shaft 2 is rotated in the direction in which the sheet 1 is fed out, as the tensioned portion of the sheet 1 is relaxed, the arms 5, 5 that support the front frame 3 are rotated by the biasing force of the tension coil spring 9 inside. If the front frame 3 is pushed forward while gradually transitioning from the bent 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 above case can be achieved. Conversely, the sheet 1 can be retracted and wound around the shaft circumferential surface while the arm is moved from the extended state to the bent state against the elasticity of the tension coil spring 9.

Moreover, when the arm is bent as the sheet is rolled up, the straight part 16 of the tension coil spring 9 is in contact with the circumferential surface of the cam 11b, and the cam part 11b is bent at the bending angle (narrow angle Q) of the arm. The radius of curvature gradually decreases as the bending angle of the arm becomes smaller, and as the bending angle of the arm becomes deeper, the tension of the tension coil spring 9 gradually decreases, so that the force of winding the sheet remains almost constant over the entire length. Become. Furthermore, when the arm extends, the repulsive force of the tension coil spring 9 gradually increases, so that abnormal tension on the seat can be avoided.

[Effect of idea]

As described above, the biasing device of the present invention inserts a tension coil spring over the entire length of the arm and utilizes the existing pivot pin that supports the base end of the first arm and the distal end of the second arm. Since a tension coil spring that constantly biases the arm in the extension direction is suspended between the bracket and the front frame by means of hooking the hook of the coil spring, the second arm is attached to the middle part of the second arm as in the conventional device. There is no need to provide a special locking member, which greatly simplifies the structure, and when assembling the spring inside the arm, the hook at the tip of the tension coil spring can be used to lock the middle part of the second arm. The troublesome work of trying to hook the pin onto the pin is no longer necessary, and the arm can be assembled and installed with extremely simple handling operations.
Since it is installed in the cam part of the connecting part of the arms where the radius of curvature gradually decreases according to the change in the bending angle of both arms, the tension of the spring can be kept almost constant when the arms are bent and extended, so it can be used as a sunshade. It becomes possible to smoothly wind up and unwind sheets without strain.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an example of a concrete implementation structure of the arm biasing device according to the present invention, Fig. 2 is a cross-sectional plan view of the same, and Fig. 3 is a diagram showing an example of a concrete implementation structure of the arm biasing device according to the present invention. It is a perspective view of an awning. 1...Sheet, 2...Take-up shaft, 3...Front frame, 4
... Front hanging, 5 ... Arm, 5a ... First arm, 5b ... Second arm, 6 ... Bracket, 7
... Pivotal pin, 8 ... Connecting body, 9 ... Tension coil spring, 9a ... Cylindrical part, 9b ... Straight part, 10,
11...Joint fitting, 10a, 11a...Shaft hole, 1
1b...Cam part, 12... Pivot, 13a, 13b
...Tube end support fitting, 14...Pivot pin, 15...
Mounting bracket, 16... straight part, 17, 18... hook, Q... angle of refraction.

Claims (1)

[Scope of utility model registration request] A first arm 5a rotatably connected to the proximal end of the awning by a pivot pin 7, and a second arm 5b connected to the front frame 3 by a pivot pin 14 to the distal end are connected via joints 10 and 11. In the arm 5, which is connected so as to be bendable and extensible by the pivot shaft 12, the hook 17 at one end of the tension coil spring 9 is hooked on the pivot pin 7 at the base end of the first arm 5a, and the cylindrical portion 9a of the coil spring 9 is connected to the first arm 5a. The straight part 16 at the other end of the coil spring 9 connected to the cylindrical part 9a is passed through the pipe of the second arm 5b.
A hook 18 provided at the tip of the second arm 5b is hooked onto a pivot pin 14 at the tip of the second arm 5b, and the bending angle of the arm 5 is small. A cam portion 11b whose radius of curvature gradually decreases as the straight portion 1
6, a portion between the first arm 5a and the second arm 5b is in contact with the circumferential side of the cam portion 11a.