JPH0433609Y2 - - Google Patents

Description

[Detailed description of the invention] A. Field of industrial application The present invention is applicable to the operation of a digital switch that is made into units for each digit, and each unit has a pushbutton switch for input and a display mounted on the front operation panel. Concerning a structure that prevents damage.

B. Outline of the invention In order to prevent the front panel of a digital switch from separating from the switch outer casing even if strong force is applied to the front panel due to rough operation,
A digital switch characterized by a plate-shaped protrusion protruding from the outer casing at the rear of the front panel.

C. Prior Art In a digital switch, the front panel is supported at both ends by grooves provided on the inner surface of the outer casing, but the operation push button switch attached to the front panel and the wiring pattern on the back surface of the panel are The connection part protrudes from the back of the panel, and there is only a small margin at both ends of the back of the panel, and the depth of the groove that supports the front panel is limited to less than the width of this margin, making it difficult to operate the pushbutton switch. If pressed with too much force, the front panel would bend, sometimes detaching from the groove, or damaging the groove or the edge of the front panel.

D. Problems that the invention aims to solve When a strong force is applied to the front panel of a digital switch, the front panel sometimes separates from the switch outer casing; however, with this invention, the front panel separates from the switch outer casing. The purpose is to prevent this and reduce the damage rate of digital switches.

E. Measures to solve the problem In digital switches, a plate-shaped protrusion is provided at the rear of the front panel from the outer casing to prevent the front panel from separating from the outer casing of the switch even if a strong force is applied to the front panel. A digital switch characterized by providing reinforcement.

F Effect In a digital switch, even if a strong force is applied to the front panel, the front panel is supported by a plate-shaped protrusion protruding from the switch outer casing, so the groove for positioning the front panel or the edge of the panel may be damaged. This eliminates this problem, extending the life of the digital switch.

E. Example The figure is an exploded perspective view of a digital switch.
In the figure, 1 is the front panel, which has a rectangular plate with a display element 1a, an addition switch 1b, and a subtraction switch 1c.
2 is a square box-shaped switch outer casing with an open top surface, and is large enough to allow the display element 1a to be seen from the front. Rectangular display window 2
A circular window 2d is provided on the front side from which the push buttons of addition switch 1b and subtraction switch 1c are projected, rectangular operation windows 2b and 2c, and power indicator light 1d are visible.
A pair of protrusions 2e and 2e' projecting from the inside of both sides to form grooves into which both ends of the front panel 1 fit, and a plate-shaped protrusion 2e and 2e' is provided from the bottom surface at a position where it contacts the rear part of the front panel 1 in its normal position. Protrusions 2h, 2i, 2j, 2k with seats for fixing the support plates 2f, 2g, printed circuit board 3, and cover 5 at the same time by thermal caulking
At the same time, an L-shaped jetty part 2 is made to protrude from the bottom surface.
1 and 21' are made to protrude, and a square cylindrical portion is formed by this jetty and the side and rear surfaces of the outer casing. This cylindrical portion serves as a guide for the connectors 3a, 3a' provided on the printed circuit board 3. That is, the pin portion 3b of the connector provided on the printed circuit board 3 and the same cylindrical portion constitute a socket. When set in the switch outer case 2, the connection part 3 protrudes from the switch outer case 2.
The upper half of the rear surface of the outer casing is cut out so that the printed circuit board 3 having a C shape can be inserted into the switch outer casing 2 from above. Reference numeral 3 denotes a printed circuit board which is equipped with a drive circuit for a numerical display element, a counter circuit that counts operation inputs inputted by a switch and forms a digital data signal, etc., and is electrically connected to the front plate 1 by a flexible circuit board 4. It is electrically connected to an external device through a connecting portion 3C.
Further, the printed circuit board 3 is provided with holes 3h, 3i, 3j, and 3k that fit into the seated protrusions 2h, 2i, 2j, and 2k provided on the bottom surface of the switch outer casing 2. 5 is a cover with protrusions 2h, 2i, 2j, 2k with matching seats.
a cylindrical portion 5h that fits into the printed circuit board 3 and presses the printed circuit board 3;
5i, 5j, 5k are provided to protrude from the bottom surface, a pair of notches 5a, 5a' are provided at the rear so as to engage with the connectors 3a, 3a', and a plate is made to protrude downward from the rear end to connect the printed circuit board 3. A rear surface 5b that comes into pressure contact is provided.
It is an L-shaped plate that fits and fits into the switch outer casing 2.

The assembly method is to insert the front panel 1 into the grooves 2e, 2e', and then insert the front panel 1 into the holes 3h, 3i, 3 of the printed circuit board 3.
j, 3k, the seated protrusion 2h of the switch outer casing 2,
2i, 2j, and 2k, and remove the switch outer casing 2.
When the printed circuit board 3 is placed in the seated protrusions 2h, 2
Insertion stops at seats i, 2j, and 2k and is positioned at the center. From above, attach the cover 5 to the seated protrusions 2h, 2i, 2j, 2k of the switch outer casing 2,
The holes 5h, 5i, 5j, and 5k of the cover 5 are fitted, and while the cover 5 is brought into close contact with the switch outer casing 2, the tips of the seated protrusions 2h, 2i, 2j, and 2k are thermally caulked. Complete assembly. Even if the addition switch 1b and subtraction switch 1c are pressed strongly in this state, the front panel 1 is firmly supported by the grooves 2e, 2e' and the support plates 2f, 2g.
The front panel 1 will not come off from the grooves 2e, 2e'.

Effects The present invention has the above-mentioned structure, and whereas in the conventional digital switch, the front panel was supported only by the protrusions 2e and 2e' in the figure, the plate-shaped support plate 2
The provision of f and 2g reduces damage during operation and extends the life of the digital switch even under conditions of rough operation.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the present invention.

Claims (1)

[Scope of utility model registration request] A digital switch characterized in that positioning grooves for holding both sides of a front panel are provided inside the outer casing, and a plate-shaped protrusion is provided from the outer casing so as to touch the rear of the front panel.