JPH0249620Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] This invention relates to a structure that saves labor in assembling a snap switch, especially a bridge type.

[Prior art and its problems]

As this kind of snap switch, JP-A-56-
Publication No. 76125 (name of invention "snap switch")
It has been known. According to this device, a bridging contact is installed in the direction perpendicular to the direction of movement of the operating rod, and the spring that provides reversal action and contact pressure is a helical compression spring that is tensioned.
Due to its small size, it is almost impossible to mechanize the assembly, which means that assembly is done exclusively by hand, which takes a lot of time. This had the disadvantage that it was difficult to reduce costs, such as the springs sometimes flying off when heated.

[Purpose of invention]

In view of the above, the object of this invention is to provide a snap switch structure that can shorten the assembly time, and in particular can be mechanized (automatically assembled).

[Key points of the idea]

In order to achieve the above-mentioned purpose, this invention includes a cover formed into a rectangular box shape made of synthetic resin with a square window in the center of the front wall, and a pair of regular box-shaped covers fixed to the inside of the cover and having lead terminals. A cover assembly consisting of an open-side fixed contact is combined with the cover to define a switch chamber, and is made of synthetic resin and has an outlet hole for guiding the output terminal of the normally open-side fixed contact to the outside. a base assembly consisting of a base, and a pair of normally closed fixed contacts fixed to the base and having an output terminal that is arranged opposite to the normally open fixed contact and led out to the outside through the base; a push rod inserted into the corner window of the cover so as to be freely advanced and retractable; a bridging movable contact supported through the push rod so as to be movable between the two fixed contacts; and ends of both leg pieces formed in a U-shape. a contact spring having a locking portion at a portion thereof and having both leg pieces fixed in a free state within the push rod by a spring presser, and connecting the locking portion of the contact spring to both ends of the bridging movable contact, respectively; The movable part assembly is divided into a movable part assembly consisting of a lever, and the base assembly and cover assembly which sandwich the movable part assembly are assembled from one direction.

[Example of idea]

Figures 1 to 4 respectively show the main parts of an embodiment of the structure of the snap switch according to this invention. Figure 1 is a longitudinal sectional view, Figure 2 is a perspective view, and Figure 3 is a partial assembly. FIG. 4 is an exploded perspective view of the movable part. In the figure, this snap switch is of an automatic return switching type, and its main part is composed of a cover assembly 1, a base assembly 2, and a movable part assembly 3, which can be divided into three parts, and are combined by linear movement. Assembly of the assembly is also similar. The cover assembly 1 includes an insulating cover 4,
It is provided with a fixed contact 5 for a normally open contact which is fitted and fixed into an insulating cover 4 and forms a set of two. The insulating cover 4 is formed into a rectangular box shape, and has a square window 4a in the center of its front wall through which an operating rod of the movable subassembly 3 (described later) freely passes through, and on both sides thereof a square window 4a that can be connected to a base of the base assembly 2 (described later) with one touch. Connectable square hole 4b
and a guide groove 4c, and a groove 4d for fixing the fixed contact 5 to the inner wall thereof. The fixed contact 5 is arranged symmetrically with an axis passing through the center of the square window 4a of the cover 4, and is led out through the fixed contact 5a and the base of the base assembly 2, which is integrated by brazing or the like. A terminal fitting 6 is provided.
The base assembly 2 includes a cover 4 and an insulating base 7 that defines a switch chamber, and a fixed contact 8 for a normally closed contact that is fitted and fixed into the insulating base 7 to form one normally closed contact. The insulating base accommodates two sets of through holes 7a and 7b through which terminal fittings of the cover assembly 1 and terminal fittings of the fixed contact 8, which will be described later, are passed through, and a return spring, which will be described later, of the movable part assembly 3. , a recess 7c for guiding the operating rod, a toothed locking pawl 7d that engages with the square hole 4b of the insulating cover 4 provided on its outer wall, and a guide protrusion 7e that fits into the guide groove 4c. We are prepared. The fixed contact 8 has a fixed contact 8a facing the fixed contact 5a, and a fixed contact 8.
a is integrated by brazing or the like, and includes a terminal fitting 9 supported by and led out from a through hole 7b of an insulating base 7. The movable subassembly 3 is located at the corner window 4a of the cover 4.
An operating rod 10 that advances and retreats, a bridging contact 11 that supports the operating rod 10 slidably in the axial direction, and a contact spring that applies contact pressure to the bridging contact 11 via a lever 12 and snaps it. 13 and a return spring 14 that engages with the operating rod 10 and is biased in the opposite direction to the operating direction.The operating rod 10 is divided into an operating button 15 and a spring retainer 16. The bridging contact 11 has a bridging piece 17,
Both ends of the bridging piece are integrated by brazing or the like on both sides, and consist of fixed contacts 5a, 8a and a movable contact 18 facing each other in the switch chamber. A through hole 17b is formed by cutting out the bottom of the contact mounting portion 17.
Engagement pins 17c protruding from both sides are formed on each side surface of a. The lever 12 is provided at the ends of both legs 12a bent in a U-shape, and the bridge piece 1
A locking piece having a U-shaped groove 12b that rotatably engages with the engagement pin 17c of No. 7, and a protrusion 12d that rises from the U-shaped bottom portion 12c and has a protrusion 12d at the tip that fits into a locking hole described later in the contact spring 13. 12e. The contact spring 13 is formed in a U-shape in which the tips of both leg pieces 13a are bent back to back in a dogleg shape, and the protrusion 1 of the lever 12 is attached to the apex of the dogleg shape of both leg pieces 13a.
A locking hole 13b is bored into which the locking hole 2d is swingably inserted. The return spring 14 is a helical compression spring. Operation buttons 15 forming the operation rod 10
has a rectangular box shape with the front side as the bottom, and the contact spring 13 can be stored inside, and the outer width allows the operation button 15 to be inserted through the through hole 17b of the bridging piece 17. The longitudinal side walls of the bridging piece 17 have window holes 15a into which the protrusion 12d of the lever 12 can be fitted into the locking hole 13b of the contact spring 13 installed inside, and a square window of the insulating cover 4. Protrusion 15b for preventing removal from 4a
and a guide portion 15c that fits into the recess 7c of the insulating base 7, and flanges 15d for supporting the bridging piece 17 are provided on both side walls corresponding to the width direction of the bridging piece 17. The spring presser 16 is a presser portion 16a that presses the bottom of the contact spring 13 built into the operation button 15.
and a space 1 that serves as an escape area when the contact spring 13 is bent.
6b, and a receiving portion 16 of the return spring 14 integrated with the connecting plate 16c.
d.

Next, the assembly of the above components will be explained with reference to FIGS. 3 and 4. The cover assembly 1 is assembled by arranging the two fixed contacts 5 on the insulating cover 4 and inserting the ears 6a of the terminal fittings 6 into the grooves 4d of the insulating cover. The base assembly 2 has a fixed contact 11 arranged on an insulating base 7 so as to face the fixed contact 5 of the cover assembly 1, and an insulating lug 9a provided on a terminal fitting 9 in each of two through holes 7b. base 7
It is assembled by inserting it into the inner wall until it locks into place.
The movable part assembly 3 has a contact spring 1 in the operating button 15.
3 is fitted and fixed with a spring retainer 16 to form an operating rod 10 with a contact spring 13 installed therein, and this operating rod 10 is inserted into the through hole 17b from the back side of the bridging contact 11.
and lock the collar 15d to the rib of the bridging piece 17. Next, insert the U-shaped grooves 12b of the two levers 12 into the engagement pins 17c provided on the bridging piece 17, and
As shown in the figure, while rotating the operation button 15 along the arrow, the protrusion 12d is engaged with the square hole 13b of the contact spring 13 through the window hole 15a of the operation button 15.
It is assembled by fitting one end of the return spring 14 into the receiving portion 16d of 6. To assemble the cover assembly 1, base assembly 2, and movable part assembly 3, first drop the movable part assembly 3 into the base assembly 2, and then insert the terminal fitting 6 of the cover assembly 1 through the insulating base 7. This can be achieved by inserting the operating rod 10 into the hole 7a and pushing the operating rod 10 into the hole 4a of the insulating cover 4 so as to lock the locking hole 7d in the square hole 4b.

Note that the engagement pin 17c of the bridging piece 17 and the lever 12
As shown in different embodiments shown in FIGS. 5 to 7, the engagement with the U-shaped groove 12b naturally allows for free rotation within the required range, but a large force must be applied in the vertical direction. It is good to have a structure that does not come off in order to facilitate assembly. In Fig. 5, the rear leg 12a with the engagement pin 17c fitted into the U-shaped groove 12b is deformed by pressing from both sides as shown by the arrow, and in Fig. 6, the opening of the U-shaped groove 12b is deformed in advance. The engagement pin 17c is press-fitted in a narrow space, and in FIG. 7, the engagement pin 17c is formed into a circular shape with a long lateral direction and is press-fitted therein.

As is clear from the drawings in the above configuration, all partial and overall assembly except for the engagement between the lever 12 and the contact spring 13 can be performed by simply moving the members in the vertical direction, making assembly easy. It has become possible to mechanize the assembly as well as to make it possible to mechanize the assembly.Furthermore, each subassembly, especially the movable part assembly, has a contact spring and a bridging movable contact supported by a push rod via a spring holder and a lever. Therefore, it maintains a stable state as a subassembly and does not disassemble during assembly, which has a great effect in shortening the assembly time including the process.

[Effect of idea]

According to this invention, the components can be assembled by reciprocating in a straight line, and the entire assembly is assembled by combining the blocks, and the cover and case are made of synthetic resin, making use of their elasticity. , it is possible to shorten the assembly time of the snap switch without reducing the operating accuracy.

[Brief explanation of the drawing]

Figures 1 to 4 show the main parts of an embodiment of the structure of a snap switch according to this invention.
Fig. 1 is a longitudinal sectional view, Fig. 2 is a perspective view, Fig. 3 is an exploded longitudinal sectional view of each subassembly, Fig. 4 is an exploded perspective view of the movable part, and Figs. 5 to 7 are based on this invention. FIG. 7 is an enlarged side view of a main part of each of different embodiments including one embodiment of the structure of a snap switch. 1...Cover assembly, 2...Base assembly, 3...
Movable subassembly, 4... Insulating cover, 4a... Square window, 4b... Square hole, 5, 8... Fixed contact, 6,
9...Terminal fitting, 7...Insulating base, 7d...Latching claw, 10...Operation rod, 11...Bridging contact, 1
2...Lever, 13...Contact spring, 15...Operation button, 16...Spring holder.

Claims (1)

[Claims for Utility Model Registration] A cover formed in a square box shape made of synthetic resin and having a square window in the center of the front wall, and a pair of normally open side fixed contacts fixed to the inside of this cover and having lead terminals. a base made of synthetic resin that defines a switch chamber by coupling with the cover and has an outlet hole for guiding the outlet terminal of the normally open side fixed contact to the outside; a base assembly consisting of a pair of normally closed fixed contacts fixed to the base and arranged opposite to the normally open fixed contacts and having an output terminal extending outside through the base; and a square window in the cover. a push rod that is inserted through the push rod so that it can move forward and backward; a bridging movable contact that is supported through the push rod so as to be movable between the two fixed contacts; a contact spring with both legs fixed in a free state by a spring presser within the push rod; and a lever that connects the locking part of the contact spring and both ends of the bridging movable contact, respectively. A snap switch comprising a movable part assembly.