JPS61177520A - Nodal mechanism - Google Patents

Abstract

PURPOSE:To obtain a nodal mechanism which displays smooth and excellent nodal operation and has a sensation of clear operation by making the frictional resistance of the sliding surface larger at top parts of a projection and recess member than at bottom parts. CONSTITUTION:The top surface of the projection and recess member 1 is the sliding surface 5 consisting of plural top parts 3 and bottom parts alternately and continuously. Films 6 formed on the top parts 3 use a material which has a lower coefficient of friction than a material constituting the whole of the projection and recess member 1 and the films 6 are formed integrally with the projection and recess member 1 by welding, embedding, etc. Further, none of the films 6 have a step at edges and the sliding surface 5 is formed smoothly. The better result is obtained as the material of the films 6 is smaller and smaller in coefficient of friction than the material of the projection and recess member 1, so there is amorphous metal as its example. Namely, the amorphous metal generally has a extremely small coefficient of friction and also has high hardness and superior wear resistance, so this is specially suitable for the films on the top parts 3.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a moderation mechanism used in mechanical switching devices, switches, etc. to determine the switching position and to obtain a crisp operating feel.

<Prior art> This type of moderation mechanism combines a concavo-convex member with a sliding surface having peaks and valleys, and a slider that slides on the sliding surface of the concave-convex member with a constant pressure. For example, a plastic molded product or metal is used as the uneven member, and the surfaces of the peaks and valleys of the sliding surface are made of the same material.

<Problems to be solved by the invention> In order to obtain a good moderation effect, the height and depth of the peaks and valleys,
Alternatively, it is necessary to appropriately select the shape of these and the shape of the slider, as well as the spring pressure that applies a certain pressure to the slider, but in conventional products, the sliding surfaces are made of the same material. Therefore, if the slippage is improved, it becomes more likely that the machine will jump over the valley without stopping, and if the slippage is worsened, a large amount of repetition force will be required, so a compromise will have to be made at an appropriate place. was there.

The present invention has been made for the purpose of solving these problems and providing a moderation mechanism that provides a good moderation effect and operational feel.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the moderation mechanism of the present invention comprises the sliding surfaces of the crests of the uneven member made of a material with a low coefficient of friction, and the sliding surfaces of the troughs made of a material with a low coefficient of friction. It is characterized by being made of a material with a higher coefficient of friction than the material of the ridges.

<Function> The moderation mechanism of the present invention has good slippage at the peaks and poor slippage at the valleys, making it difficult to jump over and making it easy to stop accurately at a predetermined position. It can be operated by force, and switching is smooth and a crisp operation feeling can be obtained.6 <Example> Next, the illustrated example will be described.

In the figure, 1 is a concavo-convex member, 2 is a slider, and the top surface of the concave-convex member 1 is a sliding surface 5 in which a plurality of peaks 3 and troughs 4 are alternately and continuously formed. Reference numeral 6 denotes a coating formed on the top of the mountain portion 3. The coating 6 is made of a material with a lower coefficient of friction than the material constituting the entire uneven member 1, and the coating 6 is coated by plating, adhesion, embedding, etc. The uneven member 1 is
It is integrated with. Further, a smooth sliding surface 5 is formed without forming a step at the edge of the coating 6.

As for the material of the coating 6, the smaller the coefficient of friction with respect to the material of the uneven member 1, the better the results will be obtained, and an example thereof is an amorphous metal.

In other words, amorphous metals generally have extremely low coefficients of friction;
In addition, it has high hardness and excellent wear resistance, so it can be said to be a particularly suitable material for the coating 6 on the mountain portion 3.

The case where amorphous metal is used for the coating 6 will be explained below. The material of the uneven member 1 itself may be plastic or metal, and after covering the parts other than the peaks 3 with masking tape for plating or masking agent for chemical plating. , electroless plating of a nickel alloy or cobalt alloy containing phosphorus or boron using sodium hypophosphite as a reducing agent, or electroless plating using a hydrided boron compound as a reducing agent, and the above-mentioned A plating layer of the alloy is formed on the surface of the peak portion 3 to form the amorphous metal coating m6.

In addition, the coating 6 may be formed by a vapor deposition process such as sputtering vapor deposition of the above-mentioned alloy, a film formed by an electroforming method, or a coating formed by a liquid quenching method, that is, adhesion of an amorphous metal ribbon. You can also do it.

In addition, in order to avoid creating a step in the i-green of the coating 6,
For example, the part on which the coating 6 is to be formed is made concave in advance by the thickness thereof, or if the uneven member 1 is made of thermoplastic resin, the coating 6 is heated and pressure is applied to the coating 6 after the coating 6 is formed. Processing such as embedding it in 3.

With the above configuration, in this embodiment, there is no problem such as the slider 2 climbing up and jumping over the valley part 4 due to the moderately high friction coefficient commensurate with the operating force in the valley part 4, and moreover, the peak part 3
Since the slider 2 can easily cross over due to its low coefficient of friction, a moderation mechanism having a smooth and crisp operation feeling can be obtained.

Note that if the coating 6 on the peaks 3 of the uneven member 1 is an amorphous alloy film of nickel alloy or cobalt alloy, it has good adhesion and extremely high wear resistance, so it can withstand long-term sliding. The material of the coating 6 will not wear out or move to the troughs 4 even if it is moved, and the sliding durability will be excellent.

The following table shows a comparison between Examples 1 and 2, in which the material combinations of the peaks 3 and valleys 4 are different, and the conventional example.
, 2 is shown to be superior to the conventional example.

(Margins below) <Effects of the Invention> As described above, the present invention has a structure in which the frictional resistance of the sliding surface of the peaks of the uneven member is lower than that of the valleys, and the operation is smooth. Moreover, it is possible to obtain a moderation mechanism that exhibits a good moderation effect and has a crisp operation feeling, and improves the switching performance of switches and the like.

[Brief explanation of the drawing]

FIG. 1 is a side view of one embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of the essential parts. 1... Uneven member, 2... Slider, 3...
Mountain part, 4... Valley part, 5... Sliding surface, 6 Coating.

Claims (2)

[Claims] (1) An uneven member having a sliding surface having peaks and valleys;
In a moderation mechanism that is combined with a slider that slides on the sliding surface of the uneven member with a constant pressure, the sliding surface on the peaks of the uneven member is made of a material with a low coefficient of friction, and the sliding surface on the troughs is made of a material with a low coefficient of friction. A moderation mechanism characterized by the dynamic surface being made of a material with a higher coefficient of friction than the material of the ridges. (2) The moderation mechanism according to claim 1, wherein an amorphous metal is used as the material with a low coefficient of friction for the crests.