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Multistage rotary switch
| Details |
Inventors: Rose, Jochen;
Assignee: International Standard Electric Corporation (New York, NY)
Primary Examiner: Pellinen; A. D.
Assistant Examiner: Ginsburg; Morris
Attorney, Agent or Firm: Raden; James B., Michals; William J.
A multistage rotary switch with several wafers, is provided with one case member with fixed contacts per switch wafer and one rotor with the movable contacts. The rotor is axially acted upon by the contact springs. The edges of the case members adjoining one another, are provided with centering grooves of the same type, in which a centering ring is inserted, and the centering ring and rotor are made from a low-friction plastic material. |
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DETAILED DESCRIPTION Each of the switch wafers includes a case member 1 with a disk-shaped recess for receiving a rotatable, disk-shaped rotor 2 which is axially displaceable therein with a small degree of radial play.
Each case member 1 is provided at the inner edge 3 of the rim portions 4 with an e.
g.
, angular centering groove 5 of equal dimensions, so that on neighbouring edges 4 there will result a continuous groove.
Into this groove there is inserted a centering ring 6.
This ring is provided with a rim 7 on both sides.
The one of these rims is applied to an annular web 8 of the case member 1 of the following switch wafer, and the other one has a bearing surface 9 on which the rotor 2 is permitted to slide with its sliding surface 10.
The rotor 2 has a preferably disk-shaped recess 11 in which a contact plate 12 provided with contacts and one or more conductor leads connecting the contacts, is inserted antirotationally.
The contacts of the contact plate 12 are acted upon by contact springs 13 inserted or moulded on the side of the case member 1, by which the rotor 2 can be pressed against the centering ring 6 and, the latter, against the case member 1 of the following switch wafer.
To the point end of the funnel-shaped center portion 21 of the rotor 2 there is moulded a coupling pin 14.
This pin has a non-circular, e.
g.
, elliptical or polygonal cross section or its outer surface is provided with an external toothing.
The coupling pin 14 projects into a blind hole 15 adapted to the outer contour thereof, of the following rotor 2 stacked thereabove, or the top one projects into such a blind hole 15 as provided for in the switch spindle 16, thus permitting all rotors 2 to be rotated simultaneously via the same switch spindle 16.
According to the invention, the centering ring 6 and, appropriately, also the rotor 2, are made from the aforementioned low-friction material.
Preferably, the rims 7 may be arranged to be set back to such an extent as to leave an interspace 19 between the outer surface 17 thereof and the inner case wall 18, in which a packing ring 20 may be arranged
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Heat Accumulators 
