DE1000488B - Cam switches, especially for electric heating and cooking appliances - Google Patents

Description

GERMAN

For regulating the heat output of electrical heating and cooking devices, especially household stoves, Cam switches are preferred, as they are a simple one compared to rotary drum switches Allow a large number of circuits and the switching and control parts used, such as Cam disks, shift levers and the like, mass-produced by pressing or stamping so that they can be produced economically. With such control cam switches are clear for the purpose and reliable connection, the power supply terminals on one side and the heating conductor connection terminals arranged on the other side. Depending on the task to be carried out, the Heat conductor terminals can be connected to two or three heating resistors of the heater, with cam disks Contact levers that switch the heating resistors act.

The invention has for its object to provide a cam switch with two mains connection terminals arranged on one side of the socket and four heating conductor connection terminals arranged on the other side of the socket to which three heating resistors connected and each connected to a cam-controlled contact lever are to be improved, namely with regard to a high number of operations and with regard to the greatest simplicity of the Control and switching parts and the compact structure and quick assembly of these parts.

According to the invention this is achieved in that two contact levers are arranged on a floor and controlled by one cam disc each, the contact levers of one floor each having one Network contact point and one of the contact levers on the other floor with both network contact points and the other only work with one network contact point.

In an advantageous embodiment, the form Network contact points each form a uniform whole, with those working together with the contact levers on the second floor Contact points are U-shaped.

It is also conceivable to connect a network contact point to a resilient intermediate contact member, which cooperates with the contact lever still working together with the other network contact point. The resilient intermediate contact member can be controlled by a cam and between the two Contact levers are arranged.

In the drawing, FIGS. 1 to 7 show two exemplary embodiments of the invention with a 7-stroke cam switch for the individual, series and parallel connection of three heating resistors. Here shows

Fig. Ι the contact lever on one level,

Cam switches, in particular
for electric heating and cooking devices

Applicant: Stotz-Kontakt GmbH,
Mannheim-Neckarau

Rudolf Wörtche, Mannheim, and Josef Dreiser,

Heidelberg-Handschuhsheim,
have been named as inventors

Fig. 2 the contact lever on the other level and Fig. 3 a longitudinal section of the cam switch.

The second exemplary embodiment is shown in the same way in FIGS. 4 to 6.

Fig. 7 shows a table showing the respective activation of the heating resistors in the seven switching positions can be found.

The mains connection terminals P ₁ , P ₂ are arranged on one side of the base 1 and the four heating conductor connection terminals I, II, III, IV are arranged on the other side of the base, as can be seen in particular from FIG. From Fig. 1, the connection of the heating resistors R ₁ , R _z , R ₃ to the heat conductor terminals I to IV can also be seen.

In the lower tier of the switch base 1, the two contact levers 3, 4 controlled radially by cams 2 are arranged, which can be pivoted about a pin 5 or 6 and are under the pressure of a leg spring 7 or 8. The pin 5 is connected to the heating conductor connection terminal I and the pin 6 to the heating conductor connection terminal IV. The contact spring 3 interacts with a contact point 9 connected to the mains connection terminal P ₁ and the contact spring 4 cooperates with a contact point 10 connected to the mains connection terminal P _2.

In the upper level of the switch base 1 there are two contact springs controlled by cams 2 ' 3 ', 4', which are pivotably seated on pins 5 ', 6' connected to the heat conductor terminals II, III and are under the pressure of torsion springs 7 ', 8'. The network contact point 10 has this at its upper part 10 'U-shape. This upper part 10 'works with the contact springs 3 ', 4' together, the contact spring 3 'in the left end position still the Mains contact point 9 touched.

The contact springs are controlled by the associated cams 2, 2 'so that the contact spring 3'

Claims (2)

in the switch positions ι, 4, 5 and 6 on the network contact point 9 and in the switch position 2 on the network contact point 10 '. The circuits of the three heating resistors R ₁ , R ₂ , i? ₃ are then such that in switching position ο none of the three heating resistors is switched on, in switching position 6 all three in parallel, in position 5 two in parallel, in position 4 a single resistor with high power alone, in switching position 3 a single resistor with small heating power alone, in position 2 two and in position ι three are connected in series. In Fig. 7 these seven switch positions of the three heating resistors R ₁ , R ₂ , R ₃ are shown in a table. The embodiment according to FIGS. 4 to 6 only differs from that according to FIGS another type of fastening of the contact lever and one mains contact. Here are the contact levers 11, ii ', 12, 12' with the heating conductor connection terminals. I. riveted to IV. But they can also be connected to them in other ways. So here is the Suspension of the contact levers 11, 11 ', 12, 12' without Use of additional swivel springs even used for the circuit. The network contact 10 is further connected to a resilient intermediate contact member 13 which is controlled by the cam 14 and cooperates with the contact lever 11 '. This additional contact spring 13 is between the two contact levers 12, 12 '(Fig. 6) arranged, while the control cam 14 itself at the distance required anyway for electrical reasons is arranged to save space between the two contact lever levels. It should also be mentioned that the contacting of the last-mentioned contact lever arrangement in all Positions is a frictional and that in the switching lever assembly according to Figs. 1 to 3 of necessary contact pressure of the contact lever 3 'on the one hand by means of the leg spring 7' and on the other hand through its inherent suspension and, in the case of the switching lever arrangement according to Figs. 4 to 6, the required Pressure of the contact lever 11 'against the network contact point 9 by its spring property and against the additional intermediate contact spring 13 by its Bias and the suspension of the intermediate contact spring 13 under the influence of the switching cam 14 -generated will. PΛ TKNTΛ NSP Γ, i "C".! Γ K ■ ΐ. Cam switch with two mains connection terminals arranged on one base side and four heating conductor connection terminals arranged on the other base side, connected to the three heating resistors and each connected to a cam-controlled contact lever, characterized in that two contact levers (3, 4 or 3 ', 4 ') are arranged on a floor and controlled by a cam disk (2 or 2'), the contact levers (3, 4) of one floor each having a network contact point (9, 10) and the contact levers (3 ', 4 ') on the other level, the contact lever (3') with both network contact points (9 ', 10') and the contact lever (4 ') only work together with one network contact point (10'). 2. Cam switch according to claim 1, characterized in that the network contact points (9, 9 ', 10, io ') form a unified whole, with the with the contact levers (3 ', 4') cooperating contact points (10 ') have a U-shape. Considered publications:
British Patent No. 672,740. 1 sheet of drawings © 609 740 12.56