JPH03190020A - switch - Google Patents

Abstract

PURPOSE:To enable a secure switch operation with small pushing force and make a switch compact by amplifying the small pushing force of a cam lever against a lever part to the large pushing force in a cam part. CONSTITUTION:A cam lever 9 and a plate spring piece 10 are inserted into a case 1, and projections 12 are engaged with engagement holes 13 of side plates to be pushed for fixation. The spring 10 is thereby pushed by a projection 4 and a bottom plate 5 for support, and one end of the spring 10 is pressure- connected to a contact 2, and the other end is pressure-connected to a cam part 7 and a contact 2, and a lever part 6 is turned around a supporting point 8 toward the upper to turn a switch on. Next, when the projected lever 6 is pushed down, the lever part 6 is turned around of the supporting point 8 toward the lower, and the cam 7 is turned to remove the spring 10 from the contact 2, and the switch is turned off. Consequently, small pushing force against the lever 6 is amplified by the cam 7 to perform a secure switch operation, and while the switch is made compact.

Description

DETAILED DESCRIPTION OF THE INVENTION I)...Industrial Application Field The present invention, like a normal pushbutton switch, opens and closes contacts ( The present invention relates to a configuration of a switch in which the switch is turned OFF and ON.

Further, as an embodiment of the present invention, an extremely small switch (for example, 4 cabinets in length, 6 cm in width, and 6 cabinets in height) is intended to be constructed, and for this purpose, the structure of each part is simplified. It is characterized by:

■)...Structure of the present invention (1)...The present invention is a small, open-bottom type with a fixed contact on the inner surface of the case top plate, the terminal of which protrudes to the outside of the case, and a protrusion for holding down a leaf spring. It consists of a cubic case, a bottom plate with a shaft holding protrusion protruding from the top surface, a cam lever with a fan-shaped lever part and a cam part protruding at a set angle around the fulcrum shaft, and a conductive leaf spring piece. Insert the leaf spring piece and cam lever into the case, fix the bottom plate to the bottom of the case, press and hold the leaf spring piece between the bottom plate and the leaf spring piece holding protrusion, and attach one end of the original leaf spring piece to one of the fixed contacts. the other end is elastically pressed against the other fixed contact and the lower surface of the cam of the cam lever;
This is a switch in which the fulcrum shaft of a cam lever is supported by a shaft holding projection, and the lever portion of the cam lever is rotatably projected upward through a slit in a top plate by the pressure of a leaf spring against the cam portion.

(2)...Next, an embodiment of the present invention will be described with reference to the drawings.A fixed contact 2.2 is provided on the inner surface of the case top plate, and its terminal 2a,
2a protruding from the case, and a case 1 having a small cubic shape with a leaf spring piece holding protrusion 4 protruding, a bottom plate 5 having a shaft holding protrusion 3 protruding from the top surface, a lever part 6 such as a fan shape, and a cam. It consists of a cam lever 9 that protrudes from part 7 at a set angle (for example, 40°) about a fulcrum shaft 8, and a conductive leaf spring piece 10 in the form of a rectangular plate.
After inserting the leaf spring piece lO and the cam lever 9 inside, the bottom plate 5 is fixed to the lower surface of the case 1, and at this time, the leaf spring piece 10 is pressed and held between the bottom plate 5 and the leaf spring piece holding protrusion 4, and the original plate spring is removed. One end of the piece 10 is supported in pressure contact with one fixed contact 2, and the other end is bent upward to connect to the other fixed contact 2.
and elastically press against the lower surface of the cam portion of the cam lever 9, and press and support the fulcrum shaft 8 of the cam lever 9 from below with the shaft holding protrusion 3, and press the lever portion 6 of the cam lever 9 against the cam portion 7 with a leaf spring piece. It is constructed so that it is rotatably projected upwardly through the slit 11 of the case top plate with a pressing force of 1O.

(3) The means for fixing the bottom plate 5 to the lower surface of the case 1 may be any suitable means, but for example, a relative engagement mechanism between the two may be used. , the engagement holes (
or by engaging the recessed portion) 13.

(4)... When the original plate spring piece lO inserted in the case 1 is pressed and held between the plate spring piece holding protrusion 4 and the bottom plate 5 of the case l, one end of the leaf spring piece 10 connects to one fixed contact 2. The other end curves upward while touching the other fixed terminal 2.
and a cam lever 9, elastically pressed against the lower surface of the cam part,
It is necessary to use the resilient force to press the cam part 7, thereby pivoting the lever part 6 upward about the fulcrum shaft 8, and maintaining the state in which the lever part 6 rotates and protrudes to the outside of the top surface of the case. be.

Therefore, for example, the leaf spring piece IO is bent in advance into an F-shape, etc., and the other end is bent upward by the clamping force when one end is pressed and held between the leaf spring piece holding projection 4 and the bottom plate 5. Provided as follows.

(5) ...Furthermore, the leaf spring piece 10 is formed into a substantially rectangular plate shape to adjust the strength of its spring pressure, that is, the dynamic pressure for pressing down the lever part 6 of the cam lever 9, and to improve the durability of the leaf spring piece. In order to maintain properties, one or more sheets are polymerized and used.

In other words, if one piece is thin, the spring pressure will be weak, and if it is thick, the spring pressure will be strong, but it will lack durability. Therefore, depending on the purpose, multiple thin sheets are polymerized and used.

■)...Effect...After inserting the cam lever 9 and the leaf spring piece lO into the case L in this order, insert the bottom plate 5 into the engagement holes 1 on the left and right side plates.
3 with the engaging protrusions 12 on the left and right side plates of the case l, and press and fix with one touch.

(2) Due to this pressing and fixing action, the leaf spring holding protrusion 4 and the bottom plate 5 of the case 1 press and hold one end of the leaf spring piece 10 and press it against one fixed contact 2, and at the same time, the leaf spring piece 10 The other end (above the other fixed contact 2) is bent upward, and the lower surface of the cam part of the cam lever 9 and the other fixed contact 2 are bent upward.
The lever part 6 of the cam lever 9 rotates upward about the fulcrum shaft 8, and the lever part 6 is pushed outward from the slit 11 in the case top plate. (switch ON).

(3)...In the switch of the present invention, when the lever part 6 protruding above the top plate is pressed down, the lever part 6 rotates downward about the fulcrum shaft 8, and at the same time, the cam part 7 rotates. , the other end of the leaf spring piece 10 that is in pressure contact with it is bent downward, and the other end of the original leaf spring piece 10 is separated from the fixed contact 2 that was in pressure contact with it, and the space between the fixed contacts 2 and 2 is opened. (switch 0FF).

(4) When the pressure on the lever part 6 is released, the leaf spring piece 10
The cam portion 7 is pushed up by the elastic restoring force, the lever portion 6 returns to its upward rotation, and the other end of the leaf spring piece 10 comes into pressure contact with the fixed contact 2 again (switch ON).

■)...Effect (1)...The switch of the present invention has the above-described structure and operation, so that the cam lever 9 has a small pressing force on the lever part 6, but a large force is applied to the cam part 7 around the fulcrum shaft 8. Since it acts as a pressing force, it has the advantage of allowing reliable switch operation with a small pressing force.This also allows the use of leaf spring pieces with relatively strong elastic force, eliminating the risk of chattering during switch operation. It can be done accurately without.

A leaf spring piece with strong elasticity and excellent durability can be advantageously obtained by using a plurality of thin leaf spring pieces stacked together.

(2)...The number of parts is 4 parts, each of which can be easily assembled: the case, the bottom plate, the cam lever, and the leaf spring piece, and the switch can be assembled by assembling them. After inserting the leaf spring piece and cam lever into the case, the bottom plate can be completed by simply fitting it into the case with a single touch, making it possible to reduce parts manufacturing costs and assembly costs.
It has the advantage of being able to significantly improve manufacturing and assembly efficiency, and also has the advantage of being able to manufacture extremely small switches.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view, plan view, and side view of the switch of the present invention; Fig. 2 is a longitudinal sectional front view, plan view, and side view of the case; Fig. 3 is a longitudinal sectional front view, plan view, and side view of the bottom plate; FIG. 4 is a front view and a plan view of the cam lever, and FIG. 5 is a front view and a plan view of the leaf spring piece. Number 1...Case, 2...Fixed contact, 2a...Terminal,
3... Shaft holding protrusion, 4... Leaf spring piece holding protrusion, 5...
...Bottom plate, 6...Lever part, 7...Cam part, 8...
・Fulcrum shaft, 9... Cam lever 10... Leaf spring piece,
11...Slit, 12...Engagement protrusion, 13...
Engagement hole. N1 Fig. 13-Engagement hole Fig. 2 Fig. 4

Claims (3)

[Claims] (1) A fixed contact is provided on the inner surface of the case top plate, and the terminal protrudes outside the case, and a leaf spring holding projection is provided protrudingly.
A small cubic case with an open bottom, a bottom plate with a shaft holding projection protruding from the top surface, a cam lever with a fan-shaped lever part and a cam part protruding at a set angle around the fulcrum shaft, and a conductive leaf spring. A leaf spring piece and a cam lever are inserted into the case, a bottom plate is fixed to the lower surface of the case, and the leaf spring piece is pressed and held between the bottom plate and the leaf spring piece holding protrusion to hold one end of the leaf spring piece. It is supported in a state in which it is in pressure contact with one fixed contact, and the other end is in elastic pressure contact with the other fixed contact and the lower surface of the cam of the cam lever, and
A switch in which a fulcrum shaft of a cam lever is pressed and supported by a shaft holding projection, and the lever part of the cam lever is rotatably projected upward through a slit in a top plate or the like by the pressure of a leaf spring piece against the cam part. (2) In the switch according to claim (1), the fixation of the bottom plate to the lower surface of the case is achieved by a relative engagement mechanism between the two, that is, an engagement recess or engagement in which an engagement protrusion formed on one side is formed on the other side. A switch that engages with a hole. (3) In the switch according to claim (1), the leaf spring piece is provided by overlapping one or more pieces formed in a substantially rectangular shape, and the leaf spring piece is provided between the leaf spring piece pressing protrusion of the case and the bottom plate. When the leaf spring piece is pressed and clamped, one end is in contact with one of the fixed contacts, and the other end is bent upward and elastically presses against the other fixed terminal and the lower surface of the cam part of the cam lever. A switch that is pre-curved.