JPH035690Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of application of the invention) The present invention relates to torsion coil springs that are incorporated into air conditioners installed in vehicles and other various devices. This relates to coil springs.

(Prior Art) Torsion coil springs have conventionally been used in various air conditioners, for example, to apply or exert biasing force on operating levers and switching doors.
For example, in Utility Model Application No. 55-94639, a torsion coil spring is used in the shutter opening/closing mechanism.

Also, as in Utility Model Publication No. 38-3614, there are some that are used as pressing springs for rotating shafts.

However, when this torsion coil spring is incorporated into the air conditioner or various types of equipment, the following problems occur.

This problem will be explained by taking as an example a case where a torsion coil spring 1 is installed to prevent rattling of a shaft 4 of a vent door 3 in a heater unit 2, as shown in FIG.

In the heater unit 2, the flow path of the air supplied from below in the figure is switched from side to side by switching the vent door 3.

As shown in FIG. 2, the torsion coil spring 1 has a fixed end 5 formed with a hook-shaped bent part, a coil part 6 which is a free end, and an engaging end formed with a semicircular bent part. 7. The fixed end 5 is engaged with a fixing hole 8 as a fixing part formed in the heater unit 2, and the engaging end 7 is engaged with the shaft 4 as an engaging part, so that the fixed end is fixed around the coil part 6. By applying a biasing force that causes the shaft 4 and the engaging end 7 to separate from each other, the shaft 4 is biased rightward in the figure, and the shaft 4 is moved between the shaft 4 and the shaft hole 9 into which the shaft 4 is fitted. This ensures smooth opening and closing of the vent door 3 by eliminating play.

Therefore, this torsion coil spring 1 is fixed in the fixing hole 8.
When installing between the fixed end 5 and the shaft 4, as shown by the arrow in FIG.
The torsion coil spring 1 is deformed as a whole so that the fixed end 5 is engaged with the fixing hole 8, and the engaging end 7 is engaged with the shaft 4. It was very difficult for workers to assemble and was not efficient.

Such problems occur not only when assembling the torsion coil spring 1, but also when disassembling the torsion coil spring 1 for maintenance and inspection, and removing the torsion coil spring 1 is also troublesome.

In addition, conventional torsion coil springs tend to be deflected more than necessary when they are installed or removed, resulting in problems such as easy deterioration of spring characteristics.

(Purpose of the invention) Therefore, the present invention makes the leg length of the torsion coil spring a predetermined length with respect to the mounting part.
It is an object of the present invention to provide a torsion coil spring that is easy to assemble and remove, has little deterioration in spring characteristics, and is easy to use as a torsion coil spring incorporated into various devices.

(Means for solving the problem) That is, the present invention solves the problem by reducing the distance between the fixed part of the device that is engaged with the fixed end of the torsion coil spring and the engaging part of the device that is engaged with the engagement end of the torsion coil spring. Rather than reducing the distance between the fixed end and the free end of the coil part, the engaging end is engaged by rotating the coil part using the fixed end engaged with the fixed part as a rotation axis. This torsion coil spring is characterized in that it can be engaged with a mating portion.

(Example) Next, an example of the present invention is shown in Figures 4 to 7.
This will be explained based on the diagram. However, the same parts as in FIGS. 1 to 3 are given the same reference numerals, and detailed description thereof will be omitted.

FIG. 4 shows a torsion coil spring 10 according to the present invention.
This figure shows a case in which the shaft 4 of the vent door 3 of the heater unit 2 is incorporated to prevent rattling in the same way as in FIG. The state in which they are respectively engaged with the shaft 4 is shown.

As shown in FIG. 4, this torsion coil spring 10 has a distance L between the fixed end 5 and the coil portion 6 with respect to the distance L between the shaft 4 and the fixing hole 8 to which the torsion coil spring 10 is attached. The length of the leg is set so that l is small. More specifically, when the fixed end 5 is engaged and fixed in the fixing hole 8, the coil part 6 is connected to the shaft 4 and the fixing hole 8.
It is assumed that the length l is determined within a range in which the fixed hole 8 or the fixed end 5 can be rotated as a rotation axis.

Therefore, such a torsion coil spring 10
To assemble the heater unit 2 to the heater unit 2, first, as shown in FIG. Once pressed (arrow in Figure 6).

Therefore, as shown in FIG. 6, the torsion coil spring 10 as a whole rotates clockwise about the fixed end 5 as a rotation axis while deforming somewhat as shown in the figure.
Similarly, the coil portion 6 rotates clockwise using the fixed end 5 as the rotation axis, and finally, as shown in FIG. 7, the engaging end 7 engages with the shaft 4 to complete the assembly. do.

In this way, the torsion coil spring 10 can be assembled by simply engaging and fixing the fixed end 5 and pressing the engaging end 7 in the direction of the shaft 4, so that the workability is very good.

In the present invention, the shapes and materials of the fixed end, the coil portion, and the engaging end themselves can be arbitrary, and the device can be applied to any part of the device, so that a wide range of applications can be expected.

Of course, depending on the manner of attachment, the distance between the engagement end 7 and the coil portion 6 may be made smaller than the distance between the attachment parts, but of both ends of the torsion coil spring, the side to be fixed first It may be configured as a fixed end, and the configuration is substantially the same as that of the above-described embodiment.

(Effects) As explained above, according to the present invention, the length of the torsion coil spring's legs is adjusted such that the length from the coil part, which is the free end, to one of the engaging ends is smaller than the interval between the attachment parts. In addition, the coil part can be rotated so that the engaging end can be engaged with the engaging part, making it possible to install or replace the torsion coil spring very easily. . In addition, when installing or replacing the torsion coil spring, there is no need to bend the torsion coil spring more than necessary, and it can be installed or removed with the minimum amount of deflection required, preventing deterioration of spring characteristics. It is possible to do so.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a state in which a conventional torsion coil spring 1 is assembled to a heater unit 2;
3 is a plan view showing the deformed state of the torsion coil spring 1 when it is installed. FIG. 4 is a plan view of the torsion coil spring 1 according to an embodiment of the present invention. FIG. 5 is a plan view of the torsion coil spring 10 in the assembled state; FIG. 6 is a plan view of the torsion coil spring 10 in a deformed state when attached; FIG. 7 is a plan view of the torsion coil spring 10 FIG. 3 is a plan view when the installation is completed. DESCRIPTION OF SYMBOLS 1... Torsion coil spring, 2... Heater unit, 3... Vent door, 4... Shaft, 5... Fixed end, 6... Coil part, 7... Engaging end, 8... Fixing hole, 9
... Shaft hole, 10... Torsion coil spring, L... Distance between fixing hole 8 and shaft 4, l... Distance between fixed end 5 and coil portion 6.

Claims (1)

[Claims for Utility Model Registration] It has a fixed end, a coil part, and an engaging end, the fixed end engages with a fixed part of the device, and the engaged end is located at a different position from the fixed part of the device. A torsion coil spring that engages with an engaging portion and has the coil portion as a free end and applies an urging force such that the fixed end and the engaging end move away from each other around the coil portion, the fixed end The distance between the end and the coil portion is smaller than the distance between the fixed portion of the device with which the fixed end engages and the engaging portion with which the engaging end engages, and A torsion coil spring characterized in that the coil part is rotated using the fixed end engaged with the fixed part as a rotation axis, so that the engaging end can be engaged with the engaging part.