JPS5918375Y2 - Gear reversal prevention spring plate holding device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a retaining device for a gear rotation prevention spring plate.

Conventionally, there is a spring plate that engages with a guide pinion to prevent the pinion from reversing, and its base is inserted into a mounting plate by utilizing its spring properties.

In this type of spring plate, when the pinion is accidentally reversed, a strong force is applied to the spring plate, causing the spring plate to flex and twist, and even move in the axial direction. The attachment could come loose, become deformed, or break.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings.

As shown in FIG. 1, the upper end of the guide shaft 1 is rotatably supported by a top plate 2, and a knob 3 is fixed to the shaft end projecting from the top plate.

Further, the inner lower end of the guide shaft 1 is loosely fitted and supported by a shaft 4a formed protruding from the base plate 4.

A guide wheel 6 meshes with a guide pinion 5 at the lower end of the guide shaft 1, and the tip of a spring plate 7 for preventing reverse rotation is also engaged with this pinion.

The spring plate 7 has a certain spring force, and as shown in FIGS. 2 and 3, the base 71 at the rear end is attached to the base plate 4, which is a mounting plate, by a mounting means using the spring property as described later. Fixed installation.

That is, the base 71 of the spring plate 7 is bent into an L-shape to form a mounting part 71a, and this mounting part has two mounting holes 71.
b, 71b is perforated.

Mounting protrusions 8, 8 protruding from the base plate 4 are press-fitted into the respective mounting holes 71b, 71b.

Further, on one side of the mounting projections 8, 8 (on the left side in FIG. 3), positioning projections 9 are provided protruding from the base plate 4 at regular intervals.
A retaining groove 9a is cut into the mounting projections 8 along the axial direction, and a spring plate abuts on the positioning projection and the upper end thereof is engaged.

Therefore, the positioning protrusion 9 positions and holds the spring plate base 71 within the holding groove 9a.

Further, as shown in FIG. 2, a protrusion 10 for preventing the spring plate from coming off is provided at the intermediate portion of the spring plate 7 so as to protrude from the base plate 4 and abut against the spring plate.

The shape of the protrusion 10 is such that a regulating groove 11 is cut along the axial direction, as shown in FIG.

The bottom surface 11 a of the regulation groove 11 is the inner surface of the spring plate 7 (the mounting part 7
1a side) is in contact with the spring plate, and this spring plate controls the deflection toward the mounting portion.

Further, the upper and lower inner surfaces 11bjlb of the regulating groove 11 lock the upper end side of the spring plate 7 to regulate this vertical movement, and the bottom surface 11
Along with a, it also prevents the spring plate from twisting.

In FIG. 1, the reference wheel 6 is biased with a certain spring force toward the hour hand wheel 13 by a spring 12, and the projections 5a, 5a of the reference wheel can be fitted into the holes 13a, 13a of the hour hand wheel.

The pipe 14 of the guide wheel 6 is rotatably supported by the base plate 4, and is non-rotatably fitted into a guide pipe 15 to which a guide needle (not shown) is attached.

16 is a minute wheel, and 17 is a second hand wheel fixed to the second hand shaft 18.

Next, the operation of the present invention will be explained.

When adjusting the guide time, when the operator turns the guide shaft 1 in the direction of the arrow in FIG. 2, the indicator wheel 6 shown in FIG. The needle is corrected.

However, if the operator accidentally reverses the guide shaft 1, the reverse rotation of the pinion 5 will be restricted by the tip of the spring plate 7, but when the rotational force of the pinion exceeds this restricting force, the spring plate will The mounting portion 71 bends toward the a side, and sometimes twists or tries to move in the axial direction.

However, such movement of the spring plate 7 is completely regulated by the regulating groove 11 of the protrusion 10.

For this reason, the engagement between the pinion 5 and the spring plate 7 does not come off, and therefore, the spring plate reliably prevents the pinion from rotating in the opposite direction.

In addition, in order to attach the spring plate 7 to the base plate 4, its base 71
while bending the positioning protrusion 9 into the holding groove 9a, and at the same time insert the mounting protrusions 8, 8 into the mounting holes 71b, 71b.
to fit.

As explained above, according to the present invention, it is possible to reliably prevent the reference rotating shaft from reversing with a simple configuration, prevent the deformation and damage of the spring plate for preventing reversal, and furthermore, the installation work of this spring plate is quick and easy. It has great practical effects, such as being able to be used in

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a developed cross-sectional view showing a state of use, FIG. 2 is a perspective view, and FIG. 3 is a cross-sectional view taken along the line III--III in FIG. 2.

Claims (1)

[Scope of utility model registration request] A spring plate for preventing reverse rotation, which has at least two mounting holes drilled in the mounting part whose tip part engages with the teeth of the gear and whose base part is layered; a fitting projection; a positioning projection that protrudes from the mounting plate; the spring plate abuts against the mounting projection; the upper end of the spring plate is engaged; and the positioning projection holds the base of the spring plate; A detachment prevention protrusion is provided between the tip and the base and protrudes from the mounting plate, and the upper end side of the spring plate is locked. A retaining device for a spring plate for preventing reverse rotation of a gear, characterized in that the device comes into contact with a surface on the opposite side of the plate to the direction of deflection, and restricts the deflection of the spring plate when the gear rotates in reverse.