JPS6110285Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is designed to prevent water from entering the timer from between the circuit board and the main shaft. This is related to the waterproof seal structure that is used.

In the conventional structure, a through hole through which the shaft can be inserted is formed in the substrate, and a sealing member having a hole with a hole diameter slightly smaller than the above-mentioned shaft diameter is attached to the substrate. In the case where the sealing member is fixed to the substrate using an adhesive, the adhesive tends to flow between the through hole and the shaft, and when this flows in, the rotational resistance of the shaft becomes extremely large. Moreover, since it takes a long time for the adhesive to harden during assembly, the assembly process tends to stall, making assembly work impossible.

Therefore, the present invention is designed to eliminate the above-mentioned drawbacks, and the frictional resistance against the shaft is made constant, and the assembly is simple and quick. Even though
It is an object of the present invention to provide a waterproof seal structure for the main shaft portion of a timer that can reliably maintain good waterproof properties in the assembled state.

The drawings showing the embodiments of the present application will be described below. Reference numeral 1 denotes a board, which represents a case or a base plate of the timer. This board is ABS
It is made of a material that can be plastically deformed as described below, such as a butadiene-containing resin material such as resin, or a metal material. 2 is a through hole, and 3 is a recessed portion, which is formed in a circular ring shape with the through hole 2 as the center. Note that this recessed portion 4 may be formed in an annular shape of any shape other than a circle. Next, 4 is a main shaft, which is inserted into the through hole 2 so as to be able to rotate smoothly without rattling. Reference numeral 5 indicates a connecting pin that extends through the main shaft 4 in a direction intersecting the axis thereof. Next, 6 indicates a knob, in which 7 is a boss portion, and a recess 8 formed in a part of the boss portion.
A connecting pin 5 is fitted into the main shaft 4 and the knob 6 so that the main shaft 4 and the knob 6 can rotate together. 9 indicates a floating prevention surface.

Next, 10 is a sealing member, which is made of an elastic material (nitrile rubber as an example).
In this seal member 10, 11 is a fitting part,
The first
As shown in the figure, when inserted into the recessed part 3, both walls 3 on the inner and outer peripheral sides of the recessed part 3
It is made to elastically come into close contact with a and 3b. 1
Reference numeral 2 denotes a seal piece, which is formed into a membrane-like annular shape as shown in the figure, and whose inner circumferential end 12a, which is formed to have a slightly smaller diameter than the outer diameter of the main shaft 4, is in close contact with the outer circumferential surface of the main shaft 4. . The seal piece 12 is designed so that the inner peripheral end 12a tightly contacts the outer peripheral surface of the main shaft 4 so that water does not pass between them, and so that the frictional resistance against the rotation of the main shaft 4 does not become excessive. The inner peripheral end 12a is thinner toward the inner peripheral end 12a.
In this seal member 10, as shown in FIG. It has been done.

To assemble the above-mentioned structure, as shown in FIG. This is done by attaching the knob 6 to the main shaft 4 at the position shown in FIG.

For items assembled in this way,
Since the above-mentioned insertion depth H is larger than the gap h, even if the seal member 10 tries to rise significantly from the substrate 1, the seal member 10 comes into contact with the lifting prevention surface 9 and is prevented from rising, and the fitting is prevented. The portion 11 remains fitted into the recessed portion 3. Therefore, the tightness of the fitting portion 11 to the concave portion 3 and the tightness of the inner circumferential end 12a of the seal piece to the outer circumferential surface of the main shaft 4 are reliably maintained.

As described above, in this invention, the sealing member 10 has its fitting portion 11 fitted into the concave portion 3 of the substrate 1, that is, the sealing piece 12 is in a free state with respect to the substrate 1. During manufacturing, the frictional resistance between the seal piece 12 and the main shaft 4 can be set to a predetermined value in terms of design.
This means that if the adhesion between the two is weak, water will leak, and if the adhesion is strong, the movement of the main shaft 4 will become heavy. This has the great effect of accurately meeting such demands.

Moreover, even if such a delicate degree of adhesion can be appropriately obtained, the assembly is such that the fitting part 11 of the seal member 10 is connected to the recessed part 3 provided on the substrate 1.
Since it can be quickly carried out by a mechanical operation of fitting the knob 6 into the main shaft 4 and attaching the knob 6 to the main shaft 4, it also has the advantage that the assembly process can be intervened during the flow of the conveyor system.

Furthermore, even if the device is designed to be assembled by such a simple operation, the depth of insertion of the fitting part 11 into the recessed part 3 is made larger than the gap between the sealing member 10 and the knob 6, The insertion part 11 is completely prevented from being removed from the part 3, and the sealing member 1
The wearing state of 0 can be reliably maintained and the waterproofness can be maintained well.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a longitudinal sectional view showing the main shaft portion of the timer, and FIG. 2 is a longitudinal sectional view showing the state before the seal member is installed. DESCRIPTION OF SYMBOLS 1... Substrate, 3... Recessed part, 4... Main shaft, 6...
... knob, 10 ... sealing member, 11 ... insertion part,
12...Seal piece.

Claims (1)

[Scope of utility model registration request] The main shaft of the timer is rotatably inserted through a through hole drilled in the board, and a knob is attached to one end of the main shaft along with the board. An annular recess is formed around the through hole on the surface facing the knob, and an annular seal member is provided on the surface facing the knob, and the seal member is an annular recess that is formed so as to be able to come into elastic contact with the recess. and an annular seal piece formed to be able to fit elastically into the outer peripheral surface of the spindle, the fitting portion being fitted into the recess, and the sealing piece tightly fitting onto the outer circumferential surface of the spindle. A waterproof seal structure for a main shaft portion of a timer, characterized in that the depth of insertion of the fitting portion into the recessed portion is greater than the gap between the sealing member and the knob.