JPS63158331A - Installation of coil spring - Google Patents

Abstract

PURPOSE:To simplify the installation work of a coil spring by previously forming an assembled part from the coil spring and an urged member and releasing one edge of the coil spring when the assembled part is installed. CONSTITUTION:An engaging member 13A is installed at the lower edge of an urged member 13, and one edge 11A of a coil spring 11 is engaged in the state where the springy force is accumulated, thus an assembled part 10 is formed. A shaft 22 is fixed onto the installation base 21 of the urged member 13, and further a projection part 21A is formed. When the assembled part 10 is installed onto the shaft 22 with such constitution, one edge 11A of the coil spring 11 is pushed upwardly by a dimple 21A, and released from the engagement part 13A, and engaged with a stopper 23 in a chassis part 20.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a coil/henne attachment force method, and is particularly useful for attaching a coil spring, which is useful when biasing a movable member in one direction with a torsion-type coil spring. It is about the method.

[Summary of the invention]

The method for installing a coil spring of the present invention is to prepare a coil spring serving as a biasing means as an assembly component that can be handled integrally with a member to be biased, and attach the integrated assembly component to a shaft of a mechanical chassis or the like. When inserted into the branch, one end of the torsion coil spring is automatically separated from the biased member. Therefore, when the integrated subassembly is inserted into the shaft of the chassis part, the biased member can apply an appropriate biasing force to the other swinging members, thereby simplifying the assembly process.

[Conventional technology]

Tape recorders and VTR (Video Tap)
When a drive mechanism such as an e-recorder is operated in recording/playback mode, variable speed playback mode, etc., it is necessary to systematically move multiple mechanical elements, so various levers, gears, Alternatively, springs are provided at various locations to bias the pinch roller in a specific direction.

FIG. 4 shows an example of a biasing means using such springs, in which 1 is a mechanical chassis, 2 is a head board swingably supported by this mechanical chassis l, 3 is a spring coil, and 4 is a magnetic 5 is a capstan, 6 is a pinch roller mounting plate, 7 is a torsion coil spring, 8 is a shaft rod, and 9 is a stopper piece.

In these mechanisms, the head substrate 2 is biased in one direction by a spring coil 3, and the pinch roller mounting plate 6 is biased by a torsion coil spring 7 to rotate counterclockwise.

[Problem that the invention seeks to solve]

This biasing means using a spring member is a conventional technique that is also used in various other mechanisms, but since the spring member must be installed while suppressing its repulsive force, it is difficult for an expert to install the spring member. There was a problem in that a lot of time was spent on assembly work.

In particular, it is necessary for the torsion coil spring 7 to engage the pinch roller mounting plate 6 and the stopper piece 9, which are biased members, while pressing one end against the repulsive force of the spring, which makes the mechanical chassis 1 compact. In a mechanism in which many parts are mounted, the difficulty of assembly increases, and if the repulsive force of the torsion coil spring 7 is strong, failure in engagement may result in damage to fingers or instruments. In some cases, damage was caused.

[Means for solving problems]

The present invention aims to solve this problem by integrating a torsion coil spring and a biased member that holds the torsion coil spring in a state in which the spring's repulsive force is accumulated in advance. In addition to being made into a subassembly part, when the biasing member made into a subassembly part is inserted into a specific location of the chassis, the repulsive force of the torsion coil spring is automatically released, and the stopper of the chassis When engaged, a biasing force is generated.

[Effect]

The torsion coil spring and the member biased by the torsion coil spring can be handled in an integrated state, and when the integrated assembly is inserted into the chassis, the convex part formed on the chassis automatically Since one end of the torsion coil spring is free and engages with a stopper on the chassis, the torsion coil spring can be attached without requiring any special tools or training.

〔Example〕

Fig. 1 shows a method of attaching a torsion coil spring (hereinafter simply referred to as a coil spring) of the present invention, where 11 is a coil spring, and 12 is a guide member (12) into which the coil spring is loosely fitted.
13 indicates a biased member into which the sleeve 12 is inserted. A locking portion 13A is provided at the lower end of the biased member 13, and one end 11A of the coil spring 11 is engaged with the locking portion 13A while accumulating a repulsive force.

Therefore, the coil spring 11. The sleeve 12゜forced member 13 is attached to the integrated subassembly part A as shown by the dashed line.
It can be treated as

20 indicates a chassis portion to which a coil spring is attached; 21
The biased member, which is formed by outsert molding on a part of the base, is attached to a base. In this installation, a shaft 22 is press-fitted into the base 21 as clearly shown in the cross section of FIG. 2, and a protrusion (dowel) 21A is formed at a predetermined position on the base. Reference numeral 23 indicates a stopper formed by cutting and raising a part of the chassis portion 20.

The coil spring mounting method of the present invention uses the above-described structure to attach the biased member 13 with a simple operation as shown below.
It is possible to apply rotational force to.

First, as shown by the dashed line, the coil spring 11 loosely fitted into the sleeve 12 is brought into a state where its repulsive force is accumulated, and one end 11A of the coil spring 11 and the locking part 12A are engaged to form the assembled part 10. Then, it is inserted into the shaft 22 formed in the chassis part 20 via the sleeve 12.

Then, the dowel 21A formed on the base 21 and the extension part of one end of the coil spring 11 are inserted into the shaft in a state where they abut each other as shown in FIG. 1. From this state, the subassembly part 10 is further pushed in. Then, one end 11A of the coil spring 11 is pushed upward by the dowel 21A, detached from the locking part 13A, and is locked to the stopper 23 on the chassis part by the repulsive force of the spring, as shown by the two-dot chain line in FIG. Ru.

Therefore, in this state, a rotational force is applied to the biased member 13 in the counterclockwise direction as shown by the two-dot chain line, and in the above-mentioned mechanical chassis or the like, it is possible to apply an appropriate biasing force to the pinch roller or the like.

In addition, as shown in FIG. 2, the locking portion of the stopper 23 is provided with a notch 23A having an inclined surface with a height of H.
This height H is at least the height hl of the dowel 21A,
It is preferable to set the height to be larger than the sum of the heights h2 of the locking portions.

In addition, after inserting the subassembly part IO, attach the E to the top of the shaft 22.
It is preferable to fit the ring 14 to prevent it from coming out.

FIG. 3 shows another embodiment of the present invention, which is applied when the number of turns of the coil spring 11 is small.

That is, when the number of turns of the coil spring 11 is small, the other end 11B of the coil spring 11 also needs to be locked to the biased member 13. Therefore, a second coil spring locking portion 13B is provided in the middle of the height and width of the biased member 13 to prevent the coil spring 11 from moving upward during the shaft insertion operation of the above-described embodiment.

Moreover, in this embodiment, instead of the dowel 21A, a part of the chassis part is cut and raised to form a protruding part 20A, and the coil spring 1 is
I am trying to cause the withdrawal effect of 1.

Note that the sleeve (guide member) 12 may be anything that holds the coil spring 13 along the shaft hole, and does not necessarily have to be in a long cylindrical shape.

〔Effect of the invention〕

As explained above, in the coil spring mounting method of the present invention, the biased member to be biased by the coil spring is prepared as a subassembly component in advance, and when this subassembly component is inserted into the chassis side, ,
Since the dowel is provided so that one end of the coil spring can be detached from the biased member, the coil spring can be attached without any tools or skill.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the method of installing the coil spring of the present invention;
FIG. 2 is a sectional view of a coil spring portion, FIG. 3 is a sectional view showing another embodiment of the present invention, and FIG. 4 is a perspective view showing an example of a biasing member. In the figure, IO indicates a subassembly, 11 a coil spring, 12 a guide member, 13 a biased member, and 21A a dowel. IO/subassembly part 20: Cross-sectional view of the chassis subassembly part No. 2 1 Cross-sectional view of another embodiment Fig. 3

Claims (1)

[Claims] A guide member that holds the coil spring is attached along the shaft hole of the biased member, and one end of the coil spring is attached to a locking portion formed on the biased member while the repulsive force of the coil spring is accumulated. When the assembled parts are locked and the assembled parts are inserted into the shaft formed in the chassis part, the protrusion part formed in the chassis part
A method for attaching a coil spring, characterized in that one end of the coil spring that is locked to the locking portion is detached, and the repulsive force thereof causes the coil spring to be locked to the stopper of the chassis portion.