SU892499A1 - Key-operated change-over switch - Google Patents

Description

(54) KEYBOARD SWITCH

one

The invention relates to electrical engineering, in particular to devices for switching electrical circuits, and can be used in control panels of various electrical devices.

A switch is known, comprising a housing, switching elements, an illumination lamp, a cap made of a translucent material, carrying on itself a figure with the designation of a switch.

However, the device is complicated in construction and has considerable dimensions.

A key switch is also known, comprising a housing, a key made from a transparent material, two control switches, a pushing member and a backlight lamp. . The known device has a significant size and low exploitation qualities.

The purpose of the invention is to reduce the size and improve operational performance.

For this purpose, a key switch comprising a housing, a key from a transparent material, two microswitches, pushing

the element and the illumination lamp is provided with an elastic bracket, a light guide from a translucent material with a cut-out and a clip, cuts are made in the body, holes are made coaxially with each other in the side walls of the keys, the pushing element is in the form of an R-shaped leaf spring, and the elastic bracket is U-shaped, leaf spring, elastic bracket and housing mounted in the cage, on the outer

10, side of the side walls of the elastic bracket, are installed the clips that are inserted into the key holes, the light guide is installed in the key, and the illumination lamp is inserted into the light guide, and the cuts of the case are placed opposite the key holes.

FIG. 1 shows a keyboard: switch disassembled; in fig. 2 - the same side view (section); in fig. 3 shows section A-A in FIG. 2; in fig. 4 and 5 - keypad remover and lamp; in fig. 6 - block key switches.

Claims (1)

In the key 1 of transparent material, in which holes 2 and 3 are made, a light guide 4 of translucent material is inserted and fixed. It has a recess 5, forming a gap for the installation of the interchangeable bar 6 with the inscription. The light guide 4 is provided with retroreflective edges 7-9 and notch 10. Rounding 11 facilitates the installation of the bar 6, Screw 12 secures the platinum spring 13 in a U-shape elastic arm 14 with the plates 15 and 16, as well as the housing 17 to the holder 18, in which a threaded hole 19, holes 20 for connecting wires to the terminals of switches 21 and 22, holes 23 for fastening the clip 18 to the chassis of the device (not shown). The BLOCK key switches (Fig. 6) consists of six switches, assembled on one holder. The switch housings 17, made of an opaque material, prevent illumination of adjacent switches. The leaf spring 13 has sloped areas 24, with which it acts on the buttons 25 and 26 of the microswitches. In order to replace the backlight lamp 27 or the rod 6 with the inscription, the key 1 with the light guide 4 fixed in it can be removed for what. use a special puller 28 (Fig. 4). Bent: inward ends 29 and 30 of spring parts 31, and 32 are inserted through slots 33 and 34 (Figs. 1 and 3) into openings 2 and for which force is applied along arrows B-) and Bd (Fig. 5), as a result of pins 15 and 1 exit holes 2 and 3, in their place of the eye are bent ends 29 and 30 of puller 28, which, when moving in arrow B, removes key 1 from housing 17. To remove lamp 27 and its installation, serve specially designed ends 35 and 36 pullers 28. Key switches can be mounted closely without limiting the size of the field they form, which ensures vaets possible sets of switches in blocks (not required for attaching the space switch of each separately) and the presence of the slits 34 and the PO, permits the puller yuishh administered without any disassembly of the device, wherein the switches are used. Claim switch A key switch comprising a housing, a key made of a transparent material, two microswitches, a pushing element and a backlight lamp, characterized in that, in order to reduce overall dimensions and improve operational qualities, it is provided with an elastic arm, a light guide made of a semi-transparent material with a cut-out and a sleeve, the cuts are made in the case, the holes are made coaxially with each other in the side walls of the keys, the pushing element is made in the form of an R-shaped leaf spring, and the elastic arm is П-shaped shaped, plate spring, elastic bracket and body are fixed in the holder, pins are inserted on the outer side of the side walls of the elastic bracket, which are inserted into the key holes, the light guide is installed in the key, and the illumination lamp is inserted into the cut-out of the light guide; keys. c h / Fsh.g f1 / g.