DE2848588C2 - Touch button - Google Patents

Description

a) In a sound chamber (9, 10) is between the actuating element (2) and the contact disc (11) a second, made of electrically conductive and resilient material, parallel to the contact disk existing contact element (22) arranged, which when pressure relief under displacement the activation element (2) automatically springs back into its initial position into its rest position, is electrically connected to a third switch contact (20) and in the rest position in Distance from the contact disc (11) is;

b) in a first switching position of the actuating element (2), the latter presses the second Contact element (22) to an electrically conductive bridge against which in their Contact disk (11) located in the initial position;

c) in a second switching position of the actuating element (2), the latter also presses the Contact washer (11) in its depressed position.

characterized in that the pivot bearing of the rocker (2) consists of one on each of the two Longitudinal walls (4) of the switch housing (1) provided pin (5) consists of one provided with a corresponding recess tab (6) of the rocker is resiliently overlapped

10. Tip button according to claim, characterized in that that the pin (5) has a semicircular cross-section on its flat support surface (8) the rocker (2) loosens with a cutting edge (7)

11. Tip button according to one of claims 2 to 10, characterized in that the rocker (2) engages around the switch housing (1) on all sides.

12. Tip button according to one of claims 2 to 11, characterized in that the rocker (2) has a pressure part (26) on each of its two arms which one half of the leaf spring (22) spanning the two switching chambers (9, 10) in each case Rest position granted a bias

13. Tip button according to one of the preceding claims, characterized in that the contact disc (11) has essentially the shape of a rectangle, the long sides of which are larger and whose narrow sides are shorter than the bulge diameter.

14. Tip button according to one of the preceding claims, characterized in that the contact disc (11) is fixed on one side and with its opposite side on the contact surface (14, 15) of the first switch contact (16, 17) rests.

2. Tip button according to Ai.spruch 1, characterized by a second switching comb · (9 or 10), whose Structure corresponds to that of the first switching chamber, with a common actuating element rocker (2) pivotably mounted between the two switching chambers is provided. -to

3. Tip button according to claim 2, characterized in that the second Kontaktelemenl by a two switching chambers (9, 10) common, supported in the middle between the two switching chambers Leaf spring (22) is formed.

4. Tip button according to claim 3, characterized in that that the leaf spring (22) rests loosely with its two free ends on a support.

ii. Tip key according to claim 4, characterized in that that the support for the ends of the leaf spring (22) through the end walls (23) of the Switch housing (1) is formed.

6. Tip button according to claim 3. 4 or 5. thereby characterized in that the central support of the leaf spring (22) consists of an electrically conductive web (21) is connected to the third switch contact (20) assigned to the two switching chambers (9, 10) is.

7. Tip button according to claim 6, characterized in that that the web (21) serving as a central support for the leaf spring (22) is a partition forms between the two switching chambers (9,10)

8 <touch key according to one of claims 3 to 7, characterized in that the leaf spring (22) has two cutouts (24) open to the side edge between two retaining lugs (25) of the web (21) intervenes

& Tip button according to one of claims 2 to 8, The invention relates to a touch button with an approximately spherical cap-shaped arched, made of electrical conductive and resilient material existing contact washer, which has edge parts on a contact surface a first Schaltkon laktes rests and can be pushed in by an actuating element, the Contact disc in the pressed-in position, the first switch contact with a second switch contact electrically bridged and automatically jumps back into its starting position when the pressure is released.

Such touch keys are already known (DE-OS 23 06 268). There it is about the keyboard an electronic calculator. The actuating elements are thus designed as pushbuttons that are inserted into the entire switch housing covering cover plate are inserted slidably. The contact disc is as Formed circular disc and lies with its disc edge on a correspondingly formed contact surface. A compression spring is arranged between the actuating element and the contact disk, via which the pressing the contact disc takes place. With these switches, however, the switching functions are on and off limited.

A touch button is also already known in which the button button is used to achieve an additional switching function over an insulating film on a curved conductive Mefnbranelement with several downwards pointing curvatures, which are assigned to the contact surfaces of an insulating plate (ÜS-PS 39 41 946). With this touch key, the key and membrane element are pressed in at different distances in addition to those in the first peeling position of the connected contacts, further contacts with the

to connect other contacts. The use of a single switching element to achieve the However, both switch positions lead to an unclear recognition of the individual switch positions and difficult, soulful handling of the key.

It is the object of the invention to provide a tap key of the type mentioned at the outset, including several, clearly to provide perceptible switching positions for the key. This object is achieved according to the invention solved by the following means:

a) In a switching chamber between the actuating element and the contact disk is parallel to the contact disk a second contact element made of electrically conductive and resilient material arranged, the pressure relief - with displacement of the actuator in his Starting days - automatically springs back to its rest position, with a third switch contact is electrically connected and is in the rest position at a distance from the contact disc;

b) in a first exhibition of the accompanying elements the latter presses the second contact element to form an electrically conductive bridge the contact disk in its initial position;

c) in a second switching position of the actuating element, the latter also presses the contact disk in their depressed position.

This results in advantages: If the actuating element is only pushed in until the second Contact element comes into electrically conductive contact with the contact disk, one obtains an electrically conductive bridging between the first and the third switch contact (first switch position). It will If the actuating element is pressed in further, the contact disc is actuated by the second one Contact element pressed in, so that an electrically conductive bridge between the first and second switch element takes place. At the same time, however, there is also an electrically conductive bridging between the third and second switch contact.

This additional switching function opens up numerous application possibilities. So z. B. the first Switching position a slow and the second switching position define a fast forward z. B. in a station search device on a radio or in the Tape control of a tape recorder.

In order to increase the switching functionality of the new push button even further, a second switching chamber are provided, the structure of which corresponds to that of the first switching chamber, as a common Actuating element provided a rocker mounted so as to be able to move between the two switching chambers is. With a single switch of this design, for example, in a tape recorder Control slow and fast tape forward and slow and fast tape rewind. Basically it is possible, also as a second contact element in this rocker switch in the two switching chambers to provide a contact disc * which is in obrer efficacy corresponds to the first contact disc, but requires a lower actuation force to press it in. In terms of production technology, however, it is simpler if the second contact element is through one of the two switching channels mern common leaf spring supported in the middle between the two switching chambers is formed. This can rest loosely with its two free ends on the end walls of the switch housing. One A particularly simple switch construction can be achieved if the central support of this leaf spring consists of an electrically conductive web, on the third switch contact assigned to the two switching chambers connected.

The rocker provided as an actuating element has

H) it is advisable to have a pressure part on each of its two arms, each of which is one half of the two Leaf spring spanning switching chambers is given a bias in the rest position. In terms of strength, the Leaf spring with one resting on three supports

ι ¹ ; Comparable to a beam that is alternately acted upon by a force acting between two of these supports. Since the leaf spring or the respectively acted upon half of the leaf spring returns to its starting position after the actuation element is relieved and the actuating element is also pivoted back into its starting position, the rocker is always in the neutral position.

When the new Scha! Ie-s is activated, the Operator at the impact of the leaf spring

the contact disk through the transition from a relatively flat spring rate to a steeper spring rate a »first message« about the first switch position. If the actuating element or the rocker is still pressed further results from the erratic

-> o Change of the spring rate like a "cracking frog" acting contact disc a clear feedback, which indicates the second switch position

Mad An exemplary embodiment of the invention is explained in more detail below with reference to the drawings. It shows

Ji F i g. 1 shows a longitudinal section through a rocker switch, the two switch positions of the rocker being indicated in the right half of the illustration (section line Α-ΞΊη Fig . 3):

F i g. 2 a half cross section along the line CD

■ to in FIG. 3 and

3 shows the representation according to FIG. 1 in plan view (right half) and in horizontal section (left half) along the line EF \ nF i g. 1.

The rocker switch shown consists of

■ »5 a rectangular one that is only open at the top Switch housing 1, which is supported on all sides by a rocker 2, which forms the actuating element of the switch is encompassed. The switch housing 1 has plug pins 3 for mounting the switch. The swivel bearing the rocker 2 consists of one provided on each of the two longitudinal walls 4 of the switch housing 1 Pin 5 with a semicircular cross-section, each resilient of a tab 6 of the rocker 2 are encroached. The rocker 2 chests with a

si tendons 7 each on the flat support surface 8 of the pin 5. Due to the semicircular design of the pin 5, the Bauhöli «. of the switch

The switch housing 1 comprises two switching chambers 9, 10. One is approximated in each switching chamber spherical domed, made of electrically conductive and resilient material existing contact disc 11 arranged, which substantially the shape of a Rectangles have the! Eye sides larger and whose narrow sides are shorter than the bulge diameter. Both contact disks are only on a narrow side set, namely the contact disc is here with two holes-12 on two pins 13 of the Schaller housing 1 pressed. With their opposite

On the narrow side, each contact disk 11 lies on a contact surface 14, 15 of a first switch contact 16.17 on. There is a second one in each switching chamber 9, 10 Switch contact 18, 19 provided, def only for pressed-in contact washer II electrically conductively connected to the first switch contact 15 or 17, respectively will. When the pressure is released, the contact disk 11 automatically jumps into the position shown in FIG. 1 (left half) Starting position back.

The two switching chambers 9, 10 are separated from one another by a third switch contact 20, which is in the Interior of the switch housing 1 merges into an electrically conductive web 21, on which a second Contact element forming leaf spring 22 is supported, which extends over both switching chambers 9,10 and with their both free ends on the end walls 23 of the switch housing 1 rests. The leaf spring 22 is in their Läge fixed by lateral cutouts 24, which between two retaining lugs 25 of the third switch con-

F i g. 1 shows that the leaf spring 22 is parallel to but at a distance from the contact disks 11 is arranged. In the rest position, the two halves of the leaf spring 22 are each supported by a pressure part 26 of the rocker 2 biased. By this pressure part 26, the two halves of the leaf spring 22 are between their two Support slightly pushed down, as the left half of Fig. 1 shows that the rest position of the Switch shows. In a first switch position, either the left or the right arm of the rocker 2 is like this pressed far down until the part of the leaf spring 22 acted upon by the pressure part 26 in electrical Conductive contact with the contact disk 11 arrives. This creates an electrically conductive connection of the third sound contact 20 via the leaf spring 22 and the contact disc 11 with the first switch con ' bars 16 or 17. In a second sound position, rocker 2 is pushed further down so that the pressure part 26 and the acted upon part of the leaf spring 22, the contact disk 11 is pressed. Through this there is now also an electrically conductive bridging

ίο between the third switch contact 20 and the second switch contact 18 or 19. At the same time, the first switch contact 16 or 17 is with the second switch contact 18 and 19 respectively.

In addition to the enlargement of the switching functions, the new switch is characterized by its special simple structure. Switch housing 1, plug pin 3, pin 5 for the pivot mounting of the rocker 2 and the pins 13 for fastening the contact disks 11 are formed by a single plastic part. A The second plastic part forms the rocker 2 with its pressure parts 26, tabs 6 and 7 cutting edges simply pressing the rocker 2 onto its swivel bearing results in the locking between rocker and Switch housing and thereby also the complete cover of the switch housing. The contact washers 11 and the leaf spring 22 are set by simply pressing them in. The switch contacts 16 to 19 are pushed into the switch housing 1 from above and held there by a simple angle, which at the same time form the contact surfaces for the contact disks 11. The third switch contact 20 is pushed into switch housing 1 from above.

For this purpose 2 sheets of drawings

Claims (1)

Patent claims: 1. Touch button with an approximately spherical cap-shaped curved contact washer made of electrically conductive and resilient material, which rests with edge parts on a contact surface of a first switch contact and from one The actuating element can be pressed in, the contact disk being the first in the pressed-in position Switch contact bridged with a second switch contact in an electrically conductive manner and when the pressure is relieved automatically jumps back to its starting position, characterized by the following features: