DE8716377U1 - Keypad for electrical devices - Google Patents

Description

DGm 326 DE
Ho/Ro

DIEHL GmbH & Co., 8500 Nuremberg Keypad for electrical devices

The innovation concerns a keypad for electrical devices, such as electronic oven timers, which is either directly facing the user or arranged under a panel with holes for the keys and operating buttons.

Electronic stove timers, as well as other electrical devices, are designed to be installed in stoves or control panels, whereby this installation is carried out in such a way that the stove timer faces directly towards the user or that it is arranged under an at least partially transparent panel together with other switching elements, whereby only the buttons and operating knobs are visible through the panel. Up to now, the front panels of the stove timers, hereinafter referred to as the button panel, have been designed differently depending on whether the stove timer can be operated directly or is arranged under a panel. In addition, in the event that the buttons should be arranged recessed in the button panel for direct operation, a correspondingly designed front panel was supplied. The buttons and operating knobs with different shaft lengths, depending on whether direct operation or operation in front of a panel is intended, were pre-assembled on the button panel and, if a panel was intended, dismantled by the stove manufacturer and after the panel was arranged

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j- The aim of the innovation was to simplify

|j the storage of keypads at the manufacturer of the

% time switches and a reduction in the stock of Ü 5 time switches at the earth manufacturer.

This task is now solved by providing uniform key recesses and shaft guides 10 with snap mechanisms in the key panel, into which both recessed or long-shaft keys and short- or long-shaft rotary knobs can be inserted and locked.

■ 15 The innovation is based on the fact that only one ^uniform keypad is produced, which

■ openings for the keys in such a form that both recessed and non-recessed, short or

¹ fixed buttons can be used, and 20 that rotary knobs for actuation axes in the timer can also be used alternatively in these openings.

\ This reduces the timer manufacturer's costs of storing keypads considerably. The stove manufacturer has the advantage of being able to select from a stock of separately supplied short-term

Each of the long-shafted buttons and rotary knobs is supplied with a uniformly supplied timer, depending on the market situation of its products, either as a timer that can be operated directly or as a timer that can be operated from behind a panel.

30 The stove manufacturer therefore has the advantage of only having to have one type of timer in stock.

35

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T I - 3 - j I 10 Further developments of the innovation are in the subclaims The j marked« The innovation will be explained below using a detailed S
I? example will be explained in more detail. I I 15 Show ice: !
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i Figi 1 a section through the front part 1
I a housing of a timer with 20 the keypad} I Fig. 1 the key panel with schematically recessed keys; I Fig. 3 the keypad with a pre- I 25 set aperture and accordingly I formed keys; I
S Fig. 4 an enlarged view of the I,
&id; Detail A in Fig. 1 with attached &igr; 30 rotary knob; I Fig. 5 is an enlarged view of the j detail B in Fig. 1 with attached ■ > «% I button. ' I 35 In Fig. 1, in a housing shown in section 1 i
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I an electronic stove timer on the front, I the key panel 2, a number of openings 3 j see which are used to hold keys. Behind I These openings are provided with a plate, preferably a I Circuit board 4, which has several microswitches 5 ft ...4 (
1

Molded onto the housing 1, which is made of plastic, are molded-on projections 7 of the same inner diameter behind the openings _, which serve to accommodate cylindrical guide parts 8. These guide parts 8 are molded onto the projections 7 with webs 9. The front end of the guide parts 8 is recessed in the openings 3 in order to be able to recess the keys into the openings. The pulse generator protrudes with its axis 11 between the guide parts 8 partially from the corresponding opening 3.

Fig. 2 shows an arrangement of the key panel 2, in which keys 12 are arranged recessed in the openings 3. A rotary knob 13 is used to operate the rotary axis 11. These keys 12 are inserted through the guide parts 8 with short shafts, as will be explained in more detail with reference to Fig. 5.

Fig. 3 shows an arrangement in which a panel 14 is arranged in front of the key panel 2, which has corresponding openings 15 for receiving long-shaft keys 16. These keys are held in the guides 8 in the same way as the keys 12 in Fig. 2. The rotary knob 17 in Fig. 3 also has a long shaft and is pushed onto the rotary axis 11 of the pulse generator 6 in the same way as the rotary knob 13.

In Fig. 4, detail A of Fig. 1 is shown on an enlarged scale. The reference numerals are the same as in Figs. 1-3. It can be seen that the guide parts have an annular bead "13 and due to their

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Slotted in the area of the bead 18, they are designed to be springy. The pulse generator 6 projects with its axis of rotation into the area of the guide parts 8, onto it is pushed out a rotary knob 13 or 17 with its shaft 19, whereby the shaft 10 has a groove-shaped notch 20, which engages the shaft in the bead 18 when pushed onto the axis of rotation. In this design of the ano-fabrication, the length of the screw f9 does not play a role, the rotary knob is always inserted into the button body until it engages in the bead 18.

In Fig. 5, the arrangement of the projections 7 and guide parts 8 is the same as in Fig. 4* Here, only a button 12 with its shaft 21 is inserted into the guide parts 8* The shaft 21 has an elongated notch 22, which allows it to move longitudinally after it has snapped into the bead 18. As a result, the button 12 can be pressed inwards and a switch head 23 can actuate the rubber-coated part 24 of a microswitch 5. With this arrangement, it is immediately apparent that the shaft length 21 can be as desired in order to enable solutions according to Figures 2 or 3.

· * 6

Claims (5)

Protection claims 1. Button panel for electrical devices, such as electronic oven timers in particular, which is directly facing the user or is arranged under a panel with holes for the buttons and control knobs, characterized, that uniform key openings (3) and shaft guides (8) with snap mechanisms (18) are provided in the key panel (2), into which both recessed or long-shaft keys (12, 16) and short- or long-shaft rotary knobs (13, 17) can be inserted and locked. 2. Key panel for stove timers according to claim 1, which accommodates several keys (12, 16) and a rotary knob (13, 17) for a pulse generator (6) for adjusting an electronic display, wherein microswitches (5) actuated by the keys and the pulse generator (6) with its axis of rotation (11) are arranged on a plate (4) behind the key panel (2). 3. Keypad according to claim 1,
characterized, that it has openings (3) for receiving recessed keys (12)* that in each opening (3) a guide hole (S) is recessed to the surface and concentric to the opening axis > i »&Iacgr; is arranged to guide a button or rotary knob switch (21 19), wherein this guide part has a resilient bead (18) into which the shaft (21, 19) can be snapped. 5 4. Key panel according to claim 3, characterized in that each guide part (8) is slotted laterally and the bead (18) is arranged at the free end of the guide part. 5. Keys and rotary knobs for a key panel according to claims 1 to 4, characterized in that the keys and rotary knobs have on their shafts, which are adapted in their length to the intended use, a circumferential groove (22, 20) for engaging the resilient bead (18). Alles