JPH0245950Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a switch device incorporated into a telephone.

[Conventional technology]

Hook switch devices have been provided that are mounted directly on printed circuit boards. FIG. 4 shows an example of this type of switch device developed by the applicant. In the figure, 10 is a base molded from a synthetic resin material, and one side of the bottom plate 11 is formed thickly. Both side plates 13 and 1 are made parallel to each other from both sides of the bottom plate with the same thickness in the thick part 12 of the bottom plate.
4 is erected, and has an upward U-shape when viewed from the side. A tongue-shaped projecting portion 15 is provided on the opposite side of the bottom plate 11 from the thick portion 12, and a slotted engagement protrusion 15A is integrally provided on the lower surface of the projecting portion. A spring hook portion 16 (see FIG. 3) whose tip is bent into an L-shape is integrally provided on the side of the thick bottom plate portion 12, and a spring hook portion 16 (see FIG. 3) is provided on the inner side opposite to this. A bullet block assembly guide 17 (see FIG. 3) whose tip end has a gradually narrower diameter is provided in a protruding manner.
A plurality of terminal insertion holes 18 are provided in the thick portion 12 between the hook portion 16 and the assembly guide 17. A plurality of bullet blocks 21, 22, 23 are assembled using the assembly guide 17 so as to be sandwiched between the thick side plate parts 19, 20. Each bullet block 21, 22, 23 has a spacer formed of a synthetic resin material into a rectangular shape, and a bullet contact piece 2 is attached to the spacer.
By inserting 4, 25, and 26 respectively,
The rear ends of each of these contact pieces are bent downward and protrude downward from the insertion hole 18. The center bullet contact piece 22 is longer than the other bullet contact pieces 24 and 26, and an actuator 27 made of synthetic resin is fixed to its tip. On the inner surfaces of both side plates 13 and 14,
Support dowels 28 and 29 (see FIG. 3) are protruded so that their axes coincide with each other, and a substantially wedge-shaped stopper 30 is provided on the side of the thick portion 12 with respect to these support dowels so as to project from the upper edge. , 31 are provided. Reference numeral 40 denotes a cover molded from a synthetic resin material, which is hollow and generally wedge-shaped as a whole.
Horizontal U-shaped fulcrum grooves 41 are provided at both side wall ends of the cover 40 and open at the side ends, respectively.
Further, a spring hook 42 (see FIG. 1) with an L-shaped tip is provided protruding from the center of the upper surface.

Therefore, the cover 40 has each bullet contact piece 21, 2.
2 and 23 are inserted from the sides of the base 10 so as to be accommodated therein, and the fulcrum grooves 41 and the fulcrum dowels 28 and 29 are fitted together, thereby swingably assembling the base 10 onto the base. It will be done. A coil spring 43 is provided between the hook portion 16 and the hook portion 42.
By stretching the cover 40, the cover 40 is biased counterclockwise in FIG. 4, and its side ends abut against the stoppers 30, 31 to determine the natural position. Therefore, the stoppers 30 and 31 act as stoppers for regulating the natural position of the cover 40. By the way, the actuator 27 is engaged with the inner wall of the cover 40, and in the natural position state, the tip of the bullet contact piece 22 is curved upward and comes into contact with the upper bullet contact piece 21. , is separated from the lower bullet contact piece 23.

The hook switch device configured as described above is
By inserting the engaging protrusion 16 into the mounting hole 46 and further fitting the bent terminal portion of each bullet contact piece into the terminal hole 47, it is directly mounted on the printed circuit board 45.

When assembled into the telephone body, a hook button 48 is located above the free end of the cover 40, and when the handset is placed on the telephone body, this hook button lowers and closes the cover against the force of the coil spring 43. Rotate clockwise in Figure 4. As a result, the bullet contact piece 22 separates from the bullet contact piece 21 and comes into contact with the bullet contact piece 23, and the communication circuit is opened.

[Problem that the invention attempts to solve]

Although such a hook switch device has a simple structure, can be manufactured at low cost, and is extremely effective, it has a structure in which the cover 40 is held in the assembly direction with respect to the base 10 only by a coil spring 43, as shown in FIG. Therefore, it must always be handled with the coil spring assembled.
For example, when removing the switch device for adjustment, maintenance, etc. after mounting it on the printed circuit board 45, the operator may have to hold the tip of the cover 40 and pull it out instead of holding the base 10 and pulling it out. Put it away. Then, as shown in FIG. 6, the side ends of the cover 40 lean against the stoppers 30, 31 and fall down, and the fulcrum dowels 28, 29 come out of the openings of the fulcrum grooves 41, so that only the cover is lifted upwards. It will be done. This causes inconveniences such as the tips of the bullet contact pieces 21, 22, 23 inserted into the cover 40 being bent or damaged.

[Means for solving problems]

In view of these circumstances, the present invention follows the basic specifications of the above-mentioned hook switch device developed as the first product, and also has stoppers integrally formed on the top surface of the bottom plate and the bottom surface of the cover side end so as to face each other. Features.

[Effect]

Therefore, the cover assembled to the base will not fall off from the base due to the abutment of the stopper, even if the coil spring is not installed, and will not be unnecessarily lifted upwards. Inconveniences such as bending or breakage of the bullet contact piece are eliminated.

〔Example〕

The present invention will be explained in detail below with reference to FIGS. 1 to 3.

In the hook switch device according to the present invention, which is the second developed product shown in these figures, the first
All parts that are the same as the next developed product are given the same symbols.
A description of its configuration and operation will be omitted. The first feature of the embodiment hook switch device is that the base 10
A stopper 50 in the width direction is integrally provided at the center of the upper surface of the bottom plate 11. More specifically, the stopper 50 has the support dowels 28 and 29.
The upper part on the side of the overhang 15 is chamfered. The second feature resides in that stoppers 60 are integrally provided on the lower surface of both ends of the opening of the cover 40. Of course, these stoppers 50 and 60 are
When the covers 40 are assembled to the base 10, their height dimensions are determined so that they abut each other.
Therefore, when the cover 40 is inserted into the base 10 from the projecting portion 15 side along the bottom plate 11, the stoppers 50 and 60 abut against each other, but the cover 4 still
0, the stopper 60 passes over the stopper 50 along the chamfer, and at the same time, the fulcrum groove 41 and the fulcrum dowels 28, 29 engage. As a result, the cover 40 is locked in the direction of removal by the abutment between the stoppers 50 and 60. When the coil spring 43 is stretched between the hooks 16 and 42, the cover 40 is biased counterclockwise in FIG.
However, in this state, the stoppers 50 and 60 are not engaged.

Now, after mounting on the printed circuit board 45, if the switch device is to be removed for some reason,
Even if you are pulled up by holding the cover 40,
As shown in FIG. 2, when the stoppers 50 and 60 abut against each other, the fulcrum groove 41 and the fulcrum dowel 28,
29 is maintained, so that the cover 40 is not rotated counterclockwise in the figure by more than a certain amount. In other words, stoppers 50 and 60
The base 10 and the cover 40 are lifted up from the printed circuit board 45 as a whole by the abutment between the base 10 and the cover 40 and the engagement between the fulcrum dowels 28 and 29 and the fulcrum groove 41. Therefore, excessive rotation of the cover 40 is prevented, and the group of bullet contact pieces is reliably prevented from being bent or damaged.

[Effects of the invention] As explained in detail above, according to the invention, by providing stoppers on the base bottom plate and the lower surface of the cover, the cover incorporated in the base can be pulled out without tensioning the coil spring. This makes handling during assembly easier, and even when operations such as lifting the cover are performed, the force is applied to the base and lifts the entire device, so the bullet contact piece does not break. Accidents caused by bending or breaking can be definitely prevented.
Furthermore, these stoppers are provided by utilizing the so-called dead space of the device, and have various practical effects such as not causing any inconvenience such as changing the specifications or increasing the size of the device.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view showing an embodiment of the hook switch device according to the present invention, Fig. 2 is a vertical cross-sectional view of the main part to explain the operation, Fig. 3 is an enlarged plan view of the base, and Fig. 4 is FIGS. 5 and 6 are vertical sectional views of the primarily developed switch device, which is the premise of the present invention, and are longitudinal sectional views of essential parts for explaining the operation. 10... Base, 11... Bottom plate, 13, 14...
...Side plate, 21, 22, 23... Bullet block, 2
4, 25, 26... Bullet contact piece, 28, 29...
Fulcrum dowel, 30, 31... Natural position regulating stopper, 40... Cover, 41... Fulcrum groove, 43...
Coil spring, 45... Printed circuit board, 50
...stoppah, 60...stoppah.

Claims (1)

[Scope of utility model registration request] A base in which a plurality of bullet blocks are installed and mounted on a printed circuit board, and a hook button that is attached to the base so as to be able to swing freely swings to open and close the contact pieces of the bullet blocks. In a hook switch device comprising a cover that
The base is integrally provided with a dowel that serves as a fulcrum for the cover on the inner surfaces of both side plates, a stopper on the upper edge for regulating the natural position of the cover, and a stopper on the upper surface of the bottom plate for preventing the cover from coming off. The cover is provided with a U-shaped fulcrum groove that opens at a side end and into which the fulcrum dowel fits, and a stopper corresponding to the bottom plate stopper at the lower end. Hook switch device.