RU2654528C2 - Switching device housing and method of its manufacture - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, namely to switching devices of push type with integrated light indication system. Switching device housing in which switching device assemblies are located consists of outer and inner housing located coaxially, in form of closed profile, outer side of inner case and inner side of outer shell are conjugated without gaps and are interconnected by unhindered stop, inner body has longitudinal and transverse thinning and protuberances, longitudinal thinning is performed at vertices of closed profile, transverse thinning is performed in places of connection housing with stops, protrusions have holes.

EFFECT: technical result of claimed device is adaptation of internal mechanisms of push-button switch due to housing usage with variable cross-section, made using profile with zero internal radius by means of longitudinal thinning along bending line.

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Description

The invention relates to the field of electrical engineering, in particular to switching devices, in particular to pressure-type switching devices with an integrated light indication system, then a push-button switch. Push-button switches are designed for use on any commercial aircraft and aircraft of military and civilian purposes as universal signal-switching components with independent switching and light-signal circuits intended for operation as part of various control systems.

Currently, a large number of pushbuttons with various technical characteristics are produced, and within each type (class) of switches, the most variable part is the light panel (cap), the dimensions of which are determined by the ergonomic characteristics and sizes of inscriptions and signs. Often there is the task of adapting the internal elements of the push button switch depending on the size of the light panel. Usually, the adaptation task is solved by installing additional parts that allow using the same mechanism (set of nodes) of the push-button switch for several sizes of the light panel.

A technical solution is known - a push-button switch with a backlight function EP 1758138 A2 (EP 20060254229 from 08/11/2006), in which the push-button switch contains LEDs located next to each other on the same substrate; two separate light barriers separating said LEDs; a single light barrier located on the rear side of the cap, the distal end of the single light barrier is located in the gap between the two light barriers, and the height of the two light barriers is sufficient to allow movement of one light barrier when the button is pressed. At least two support levers, two light barriers, a plurality of terminals are integrated into the structure of the button base, the substrate is placed on the support levers in such a way that contact is made with the lower ends of the two light barriers. The design of the cap is not connected by overall dimensions with the body of the push button switch, and thus, the dimensions of the cap can be increased or decreased independently of the mechanisms of the push button switch.

The disadvantage of the analogue is the lack of protection of the light panel from removal or kink when applying force to it, directed from the side or in case of accidental engagement from below.

The closest technical solution to the invention according to the technical essence is the device (Patent for invention US No. 2006/0237298 from 04.25.2005, H01H 3/44, publ. 09/26/2006, patent holder "Korry Electronics Co"), containing a hollow body, which has a gap with a movable button with a light board, a fixed base of the drive mechanism (pusher assembly, return mechanism, tactile signaling device), a flexible printed circuit board is placed both on the base of the drive mechanism and on the movable button with backlight.

The disadvantage of the technical solution is the use of a housing with a constant cross-section, which does not allow the use of internal switch assemblies (pusher assembly, return mechanism, flexible printed circuit board, tactile signaling device, etc.) when changing the size of the light panel, the correspondence of the internal bending radii of the case and surface shapes of structural elements of the switching device.

Typically, the button switch housing is configured as a profile (extruded, bent, etc.) into which the button switch mechanisms are installed. The main problem of adapting the mechanisms of a push button switch is to ensure compliance with the internal radii of the flexible body and the surface shape of the structural elements of the push button switch. The adaptation task is greatly simplified if the inner radius of the bending of the body is close to zero.

A known method of manufacturing a bend (Patent No. 26201 from 04/10/2002, B21D 1/00, publ. 11/20/2002), according to which perforated bent profiles are made in the form of a strip blank in rolls of a roll-forming mill of a spatial structure and have holes (perforation), moreover, the area of the holes is at least half of the total surface area of the workpiece, and the edges are made with the possibility of locking connection of two or more structures.

The disadvantage of this manufacturing method is the impossibility of forming a profile with a "zero inner radius" of bending.

Closest to the proposed invention is a method of manufacturing a bend (Patent for the invention No. 2086329, 04/20/1994, B21D 22/10, publ. 05/10/1996) from thin-walled materials with a radius of mating of the wall and side close to zero by changing the thickness of the material , namely, a thickening in the bending zone, this is achieved by the fact that before bending on the workpiece, a wave of excess material is created in the bending zones.

The disadvantage of this manufacturing method is the impossibility of forming a profile with a zero bending radius, while the solution result is a bend close to zero.

The technical result of the claimed invention is the adaptation of the internal mechanisms of the push-button switch through the use of a housing with a variable cross-section, made using a profile with a zero internal radius by means of longitudinal thinning along the bending line.

The technical result is achieved by the fact that the housing of the switching device, in which there is a gap with a button with a light board, the base of the drive mechanism and a switch, a flexible printed circuit board, which is placed both on the base of the drive mechanism and on a movable button with a light board, consists of coaxially located external and internal buildings, having the form of a closed profile. The outer side of the inner case and the inner side of the outer case are interfaced without a gap and are interconnected by one-stop focus. The inner case has longitudinal and transverse thinning and protrusions, longitudinal thinning is made at the vertices of the closed profile, transverse thinning is made at the joints of the cases with stops, the protrusions are provided with holes.

Moreover, the inner case contains supporting elements at the ends of the base of the drive mechanism, mating at the ends of the base by deflection.

A method of manufacturing a case of a switching device, where the formation of the profile of structural elements is carried out by changing the thickness of the material at the bend, and the structural element - the inner case is made in the form of a profile from a sheet blank, while longitudinal thinning along the bending line is performed by at least a third of the thickness before forming a sheet and a width of at least two bending radii.

Moreover, according to the method of manufacturing the housing of the switching device before forming the profile, transverse thinning is performed perpendicular to the bending lines by at least a third of the sheet thickness, and holes are made in the protrusions.

The invention, its feasibility and the possibility of industrial application are illustrated by drawings, where:

FIG. 1 is a perspective view of a housing of a switching device in isometry, with local views A, B.

FIG. 2 is a perspective view of a housing of a switching device in an isometric view, with a view A in front of the inner case and a scan of the inner case B from the inside;

FIG. 3 - housing switching device, front view, the cap is conventionally not shown.

In the drawings, there are the following notation:

1 - housing;

2 - button;

3 - light panel;

4 - base;

5 - drive mechanism;

6 - microswitch;

7 - a pusher;

8 - flexible printed circuit board;

9 - outer casing;

10 - inner case;

11 - closed profile;

12 - the outer side of the inner case;

13 - the inner side of the outer casing;

14 - emphasis;

15 - the inner side of the inner case;

16 - longitudinal thinning;

17 - transverse thinning;

18 - ledge;

19 - hole;

20 - supporting element;

21 - end face.

The housing 1 of the switching device (Fig. 1-3), in which there is a gap, a button 2 with a light board 3, a fixed base 4 of the drive mechanism 5 and a switch 6, in the form of four microswitches equipped with a pusher 7. Button 2, base 4 are made of dielectric material, for example ABS-2020-31, black, rec. 901, premium, TU 2214-019-00203521-96. Flexible printed circuit board 8 is placed both on the base 4 of the drive mechanism 5 and on the button 2 with a light board 3. Moreover, the housing 1 consists of a coaxially located external 9 and internal 10 housing, having the form of a closed profile 11. External 9 and internal 10 of the housing are made from the tape M-NT-НО-12Х18Н10Т-3-8 GOST 4986-79 with a thickness of 0.5 and 1.0 mm, respectively. The outer side 12 of the inner casing 10 and the inner side 13 of the outer casing 9 are interfaced without a gap and are interconnected by a stop 14. The inner side 15 of the inner casing 10 has longitudinal 16 and transverse 17 thinning and protrusions 18, longitudinal thinning 16 is made at the vertices of the closed profile 11 , transverse thinning 17 is made in the joints of the housings 9, 10 with stops 14, for example, of wire DKRNM L63 3.0 GOST 1066-90. The protrusions 18 are provided with holes 19. The inner housing 10 includes support elements 20 at the ends 21 of the base 4 of the drive mechanism 5, mating at the ends 21 of the base 4 by deflection.

A method of manufacturing the housing 1 of the switching device, where the formation of the profile of the structural elements is carried out by changing the thickness of the material at the bend, and the structural element - the inner housing 9 is made in the form of a profile from a sheet stock, for example from a sheet stock from tape 1,0-M-NT-НО -12X18H10T-3-8 GOST 4986-79, while before forming the profile, longitudinal thinning 16 is performed along the bending line by at least a third of the sheet thickness and a width of at least two bending radii.

Moreover, according to the manufacturing method of the housing of the switching device before forming the profile, lateral thinning 17 is performed perpendicular to the bending lines by at least a third of the sheet thickness, and holes 19 are made in the protrusions 18.

Before placing buttons 2 with a light board 3, base 4 of the drive mechanism 5, microswitches 6, equipped with pushers 7, flexible printed circuit board 8 in the case 1 (Fig. 1-3), the case 1 is assembled. The case 1 consists of an external 9 and an internal 10 of the case, having the shape of a closed profile 11. A closed profile 11 with a bend with a zero radius is produced due to the presence on the inner side 15 of the inner case 10 of longitudinal thinning 16 and protrusions 18, at the four vertices of the closed profile 11. In this case, the inner case 10 is made in the form of a closed of that profile, before forming the profile, longitudinal thinning 16 is performed along the bending line by at least a third of the sheet thickness and a width of at least two bending radii, and holes 19 are made in the protrusions 18. Moreover, before forming a closed profile, lateral thinning 17 is perpendicular to the bending lines by at least a third of the sheet thickness and a width of at least two bending radii.

When assembling the housing 1, the inner housing 10 is located inside the outer housing 9 coaxially. The outer side 12 of the inner casing 10 and the inner side 13 of the outer casing 9 are installed and interconnected by an abutment 14 by riveting the abutment 14 on the outer casing 9, a locking head with a countersunk head are located on the outer side of the outer casing 10. The abutment 14 is placed in the transverse thinning 17 of the inner housing 9. On the protrusions 18 produce holes 19 to reduce weight. The supporting elements 20 of the inner housing 10 after installing the drive mechanism 5 bend at the ends 21 of the base 4 of the drive mechanism 5.

The device operates as follows. When you press the button 2, it acts on the drive mechanism 5 and the pusher 7, the microswitch 6 is triggered. When the force is removed from the button 2, the drive mechanism 5 removes the effect on the microswitch 6, the microswitch 6 is switched.

In contrast to the prototype in the proposed device due to the use of a housing of variable cross-section, in which a profile with a zero inner radius is made by means of longitudinal thinning along the bending line, adaptation of internal mechanisms is ensured when the size of the scoreboard or button is changed.

Unlike the prototype, where the formation of a bend is carried out by thickening in the bend zone, the result is a bend close to zero, in the proposed method is carried out by longitudinal thinning along the bend line, the result is a bend with a zero radius.

Claims (4)

1. The housing of the switching device, in which with a gap is placed a movable button with a light board, a fixed base of the drive mechanism and a switch; a flexible printed circuit board is placed both on the base of the drive mechanism and on a movable button with a light board, characterized in that the case consists of a coaxially located external and internal case, made in the form of a closed profile, the outer side of the inner case and the inner side of the outer case are interfaced the gaps and are interconnected by one-stop focus, the inner case has longitudinal and transverse thinning and protrusions, longitudinal thinning is made at the vertices of a closed profile, transverse thinning tions are made in the joints of abutments housings, the protrusions are provided with holes. 2. The housing of the switching device according to claim 1, characterized in that the inner housing contains support elements at the ends of the base of the drive mechanism, mating at the ends of the base by deflection. 3. A method of manufacturing a housing of a switching device, where the housing is formed by changing the thickness of the material at the bend, characterized in that the housing is made in the form of a profile from a sheet blank, while before forming the profile, longitudinal thinning along the bending line is performed by at least a third of the sheet thickness and a width of at least two bending radii. 4. The method according to p. 3, characterized in that before forming the profile, transverse thinning is performed perpendicular to the bending lines by at least a third of the sheet thickness, and holes are made in the protrusions.

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