DE1171496B - Electrical switching device with a rotatably mounted cam - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Boarding school Class: H 02 c

Number:
File number:
Registration date:
Display day:

German KL: 21c-39/04

R 28170 VIIId / 21 c

June 18, 1960

4th June 1964

The invention relates to an electrical switching device with a rotatably mounted cam, which has a switch operating surface with a raised part and a step, and with two Contact arms, the ends of which run up on the cam surface when the cam rotates and one after the other can fall over the step, the first of the contact arms made of a leaf-like spring member is formed, which has two mutually angled sections, one of which extends tangentially to the cam, and the other is anchored so adjustably that the tangential extending to the cam section can be adjusted in its longitudinal direction.

An electrical switching device is known in which, similar to a switching device of the type mentioned at the outset, two contact arms are present, but only the end of one of the Contact arms runs up on the cam surface, falls over the step and thereby the connection with the second contact separates. In the area of the step is on the cam of the known switching device arranged an eccentric, over which the end of the contact arm slides, and which one has a corrugated circumference which, depending on the position of the disc, is more or less in the cam surface extends and thereby the time of the dropping of one contact arm and thus the opening of contacts changed.

The switching time is varied in an irregular manner by this design. Also can this known switching device can only be used to control a single circuit.

An electrical switching device of the type mentioned in the introduction is also known, but which is also only suitable for controlling a single circuit.

In contrast, the object of the invention is to provide an electrical switching device of the introductory to create named type, which is used for the precise and fast control of two circuits can be.

According to the invention this is achieved in that a third contact arm is provided, which to the first contact arm is arranged with a fixed minimum distance, and that of the successive one Falling of the contact arms from the step with the second contact arm in or out of the way Intervention can occur.

The contact arms are preferably dropped with a snap action.

The invention makes an extraordinary one

Electrical switching device with a rotatable
mounted cams

Applicant:

Ranco Incorporated, Columbus, Ohio (V. St. A.)

Representative:

Dr. E. Wiegand, Munich 15,

and Dipl.-Ing. W. Niemann,

Hamburg 1, Ballindamm 26, patent attorneys

Named as inventor:
Louis Junior Eggert, Worthington, Ohio,
Wilüam Sanford Tufts, Columbus, Ohio
(V. St. A.)

Claimed priority:

V. St. v. America July 2, 1959 (824 518) -

simple switching device of the aforementioned type created, by means of which two electrical Circuits can be controlled, as is the case, for example, with a timing device for a machine may be required to dry items of clothing. Another advantage of the invention is that the dropping of the contact arms from the step of the cam occurs with a snap action. This increases both the accuracy and the speed of shifting.

An embodiment of the invention is explained below with reference to the drawing, for example.

F i g. Fig. 1 is a side elevational view of a timing motor driven electrical switch gear embodying the invention; a cover of the switchgear has been removed and certain switch parts are shown broken away;
F i g. FIG. 2 is a partial view of the FIG. 1 switching device shown and shows certain parts of the switch in other positions;

FIG. 3 is a view similar to FIG. 1 however, certain contact parts in other positions again;

FIG. 4 is a view taken along line 4-4 of FIG. 1. In the illustrated preferred embodiment of the invention, the switching device is in a

409 598B94

Including timing devices driven by an electric motor, which are used for this purpose can, the temporal work of a machine, z. B. one for drying clothes, to regulate, and can control the two electrical circuits, so that after a predetermined working time the timing device the one circuit is opened and the other is closed and after a second predetermined working period of the

Step 13 passes the edge 15b of the right end of the sheet 15, which then falls to the bottom of the step 13 and causes the end of the sheet 16 to fall and ride on the highest part of the 5 surface 14, thereby causing that the contacts 15 a and 16 a are separated from each other and the sheet 17 falls down and brings the contact 17 a into engagement with the contact 16 a, as shown in FIG. 2 is shown. This way one becomes over

first circuit closed again and the second io the contacts 15 a and 16 a closed circuit

Circuit is opened again. The invention can be interrupted and a circuit can be made through the Of course, contacts 16 a and 17 a are also closed for timing devices to regulate,

or control any other circuits - If you continue to turn the cam 11 clockwise -

be det. direction, the end of sheet 16 falls from the top

The Zeitstelleinrich- 15 ren edge of the step 13 shown in the drawing and brings the contact

device has a box-like \ § _a open on one side again in engagement with the contact 15 a, and

Housing 10, which is made of molded insulating material, as according to the spacer 18, the contact

Synthetic resin, is made and separated by a suitable 17 a from the contact 16 a, as shown in FIG

Lid can be closed by the Ge F i g. 3 is shown. In this way, the

housing is removed. A cam 11 is within 20 original circuits after a given

of the housing can be rotatably closed again by means of a shaft 12

gert running at a suitable speed, e.g. B. angular movement of the cam 11 is determined,

one revolution per hour, by one with kon- which is necessary to the high edge of the step

constant speed running synchronous motor over a 13 the angle from the end edge of the sheet 15 to

Reduction gear is driven. To let through 16, this arrival 25 _TO r end edge of the sheet,

Driving means are not shown because it is in the angle designated by "α" in FIG. 1

Technology known and for the understanding of the invention indicated by dash-dotted lines, the level

application are not required. represent the axis of the cam

The cam 11 has a slightly undercut cut and through the end edge of the blades 15

Step 13, the upper end of which goes through with its lower 30 or 16, which with the cam surface 14

Cooperate end by a gradually rising surface 14.

connected is. Provision can be made for turning.

the shaft 12 must be hand taken to the lens of the angle "α" described to be accurate

Setting the time setting device for the work process Setting the time interval between the described

make, however, for the sake of simplicity, the 35 level switching operations must be enabled.

Representation of such a known aid The leaves 16 and 17 are with their left ends

omitted. anchored to connecting parts 20 and 21, which in

The switching device contains three flat, sheet-like housing 10 embedded or otherwise similar to it Spring parts 15, 16, 17, which are fastened at one end and which means for connecting the the housing 10 are anchored and their opposing 40 respective contact sheets with the to be regulated overlapping ends contacts 15 a, 16 a (which create a circuits.

Double contact is, as shown) or 17 a wear, The sheet 15 is to a generally L-shaped Ge

which are arranged so that the contactless stalt bent and has a portion 15 c, which is

each of the contacts 15 a and 17 a engage perpendicularly extends (when looking at the drawing),

can. All sheets 15, 16, 17 have a front 45 and a section 15 d, which is tangential

tension extends in the direction against the surface 14 of the Nok direction to the cam. The section

kens 11. The sheets 15 and 17 are fastened by a 15 c by a rivet 15 e on a rod-shaped

Spacer 18 made of rigid insulating material is anchored by a bearing arm 23 which is attached to the housing 10

held separately, the middle part of which is rigidly attached, for example by inserting it into the

through an opening of the sheet 16 extends 50 material of the housing is embedded. Part of the

and its opposite ends are reduced in size. Blade section 15c is against the anchored end

and displaced through openings in the sheets 15 and 17 and pretensioned in such a way that it is with the

extend through (Fig. 1). Through this right-hand end of a screw 24 is engaged,

tion, the two outer sheets 15 and 17 are in a through the bearing arm 23 passing

held at a predetermined distance while the opening is screwed in. The left end of the

the contact screw 24 carried by the middle sheet 16 protrudes through an opening in a side

16 a with one or the other of the contacts wall of the housing 10 through so that they can be used to

15 a and 17 a can engage. It can be easily accessed using a screwdriver. lent that the end of the sheet 16, which is beyond It can be seen that by adjusting the protruding of the contact 16 a, above the end 60 screw 24 is in the opening of the bearing arm 23 of the sheet 15, so that this end of the sheet is offset Part of section 15c of sheet 15

16 follows the high part of the cam surface 14 on the end of the screw, being in the direction of

can put after the sheet 15 on the low
Part has fallen, as shown in FIG.

It can be seen that when the cam 11 is im
Clockwise from that shown in FIG
Position is turned out, the high edge of the

device against the cam 11 or bends away from it and according to the angular shape of the sheet
65 15 causes the section 15 d to move in the longitudinal direction and to move the end edge 15 b in the tangential direction relative to the cam surface, whereby the angle "α" increases or

and thus the time interval in which the blades 15 and 16 fall down from the step 13, adjustable can be changed. This adjustability is shown in FIG. 1 in full and in dashed lines Lines illustrating the portion of blade 15 riding on the cam surface in two different positions.

The angle "α" represents an angle setting that creates a period of time between switching operations, and the angle "b" represents a shorter period of time made by turning the screw 24 inward. It will be seen that extremely precise adjustment of the position of the blade relative to the cam can be conveniently achieved by means of the screw 24, and the means, as shown, are extremely simple and can be incorporated into a switching device of the type indicated at little cost .

It will be understood that the blade 16 can be adjusted in a manner similar to that described with reference to FIG the setting of the blade 15 has been described, and this embodiment also lies within the framework of the present invention.

Claims (2)

Patent claims: 1. Electrical switching device with a rotatably mounted cam that has a switch actuating surface with a raised part and a step, and with two contact arms, the ends of which when the cam rotates on the Can run up the cam surface and fall one after the other over the step, the first of which is the Contact arms is formed from a leaf-like spring part, which two at an angle to each other has lying portions, one of which extends tangentially to the cam, and the other is anchored adjustable in such a way that the section extending tangentially to the cam in its longitudinal direction can be adjusted, characterized by a fixed Minimum distance to the first contact arm (15) arranged third contact arm (17), the in the successive fall of the contact arms (15, 16) from the step (13) with the second contact arm (16) can come into or out of engagement. 2. Switching device according to claim 1, characterized in that the falling of the contact arms (15, 16) from step (13) takes place with a snap action. Considered publications:
German utility model No. 1748 661;
German interpretation document No. 1 055 088. 1 sheet of drawings 409 598/394 5.64 © Bundesdruckerei Berlin