JPS6350745Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a switch, and in particular can prevent flux from flowing into the inside of the switch when soldering the switch to an electric circuit board, etc. Regarding the switch.

(b) Prior Art Conventionally, this type of push switch has a pair of substrates on which terminals and fixed contacts are formed, for example, by insert molding a plurality of leads, inside a body so that the terminals protrude outside. The movable contact, which is attached to the fixed contact and slidably attached to the fixed contact, is moved by a pressing operation of a slider to switch the electrical connection state of the terminal. an insertion hole,
There is a small gap between the terminal inserted into the insertion hole, and during soldering when attaching the switch to an electric circuit board, flux flows into the body through the gap, causing the movable contact piece and the fixed contact piece to flow into the body. There was a problem that poor contact occurred between one side. For this purpose, a method has been implemented in which an adhesive is applied to the insertion hole to prevent flux from flowing into the insertion hole. Alternatively, there is a method of constructing the body by setting an insert-molded substrate in a body mold and insert-molding it again.

However, no matter which method is adopted, there is a problem in that extra steps are required to manufacture the switch, which reduces workability.

(c) Purpose The object of this invention is to solve the above problems and to provide a push switch in which the flux does not flow into the body and the substrate can be easily attached to the body.

(d) Structure Therefore, the feature of the present invention is that a molded portion is formed at the base end of the lead of the board to fit into the insertion hole formed in the body and to be welded to the peripheral edge of the insertion hole. It is in the point where it was done.

(e) Embodiments The present invention will be explained in detail below based on the illustrated embodiments, taking a push switch as an example.

Figure 1 shows the push switch of the present invention.
is a body made of synthetic resin such as epoxy resin. A plurality of insertion holes 2 are bored in the bottom surface of the body 1 at predetermined intervals.

Reference numeral 3 denotes a pair of substrates mounted inside the body 1, and as shown in FIG. 2, one common terminal 12c and two terminals 12a and 12b are insert-molded into the substrate 3. Here, each terminal includes a fixed contact piece and a lead, 5a and 5b are fixed contact pieces made of phosphor bronze, etc., formed integrally with the leads 4a and 4b, respectively, and 5c is a fixed contact piece formed integrally with the lead 4c. 6 is the fixed contact piece 5a,
5b and 5c, and is a movable contact piece that electrically connects the fixed contact pieces 5a, 5b, and 5c.

Reference numeral 7 denotes a slider whose lower half is housed in the body 1, and by pressing the slider 7, the movable contact piece 6 is moved to switch the electrical connection state of the lead 4.

Specifically, the switching operation is performed by pressing the V-shaped locking piece 8 integrally projecting in the lateral direction of the body 1 with the other end of the hook rod 10, one end of which is locked with the auxiliary spring 9, by the slider 7. This is done by locking and releasably depending on the operation. The slider 7 is always urged upward by a spring (not shown), and returns upward when the hook rod 10 is released from the locking piece 8.

A molded portion 11 is formed at the base end of the lead 4 of the substrate 3 to fit into the insertion hole 2 formed in the body 1. The mold portion 11 is formed integrally with the mold 13 of the substrate 3, and has a tapered surface that decreases toward the tip of the lead 4. When the mold portion 11 is fitted into the insertion hole 2, the tapered surface is formed on the body 1. protruding from the outside.
In this state, the peripheral part of the insertion hole 2 is melted by heating or ultrasonic waves, and the mold part 11 is melted.
Weld with. Alternatively, the distal end of the molded portion 11 is melted by heating or ultrasonic waves, and welded to the peripheral edge of the insertion hole 2.

According to the effect of the embodiment of the present invention, the mold part 1
Since the tapered surface is formed on the body 1, the board 3 can be smoothly inserted into the body 1.

The present invention is not limited to the illustrated embodiment, but can be applied to slide switches and other types of switches.

(F) Effect As described above, in this invention, a molded portion is formed at the base end of the lead of the board to fit into the insertion hole drilled in the body, so that the base end of the lead can be inserted into the body without any gap. This prevents flux from flowing into the body during soldering, eliminating the risk of poor contact between the movable contact piece and the fixed contact piece. Further, there is no need to apply an adhesive or attach the substrate to the body by insert molding, as in the past, and work efficiency is further improved.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of an embodiment of the present invention, and FIG. 2 is an enlarged front view of a terminal. 1... Body, 2... Insertion hole, 3... Board, 4
... Lead, 5 ... Fixed contact piece, 6 ... Movable contact piece,
7...Slider, 11...Mold part, 12...
terminal.

Claims (1)

[Scope of utility model registration request] A board on which leads and a fixed contact piece are formed by insert molding a plurality of terminals, and a body on which the board is mounted and an insertion hole is bored in the bottom surface into which the leads are inserted so as to protrude to the outside. , a movable contact piece slidably attached to the fixed contact piece;
In the switch, the switch includes a slider that moves the movable contact piece and switches the electrical connection state of the lead, and the proximal end of the lead is fitted into the insertion hole of the body and is welded to the peripheral edge of the insertion hole. A switch characterized by having a molded portion formed therein.