An Improved Electrical Selector Switch.
Year: 1899

page_text: Date of Application, 10th Oct., 1899
6th July 1000 Accepted 1st Sept. 1900
An Improved Electrical Selector Switch.
AUGUST ECKSTEIN, Electrical Engineer, Peel Works, Adelphi, Salford, Lan-
cashire, HERBERT JOIN COATES, Electrical Engineer, Peel Works, Adelphi,
Salford, Lancashire, do hereby declare the nature of this invention to be as
follows:-
Our invention relates to an improved form of electrical switch, and is more
especially applicable to that class of switch used in telephonic or telegraphic
circuits for selective purposes, and is designed to afford a ready means of indicat-
ing the circuits for selection, and also to form an efficient guard to the switch
lever or arm.
In carrying our invention into practice, the contact studs of the switch are
formed with a deep groove wholly or partially around them, and the end of the
contact arm or switch lever is arranged to enter the grooves in the studs, and to
make contact with the upper or lower surface of the grooves or with both of
them, if the latter, the end of lever might be laminated.
The contact arm or lever can be either moved over an arc of a circle or in a
straight line, the studs being arranged to suit. The upper surfaces of the studs
are engraved with numbers, or other distinctive marks as may be desired, or they
may be suitably recessed so as to receive labels or tablets numbered or marked.
It will be seen that the studs afford ready means of identification of the
several circuits they are put into connection with, and the switch arm or lever
fitting into the grooves of the studs and making contact therewith, is also afforded
protection from undue strain, as the lever cannot be forced away from the studs,
and the necessity for providing a separate guard plate is entirely obviated.
Dated the 9th day of October 1899
AUGUST ECKSTEIN.
HERBERT JOHN COATES.
An Improved Electrical Selector Switen.
We, AUGUST ECKSTEIN, Peel Works, Adelphi, Salford, Electrical Engineer, and
HERBERT JOHN COATES, Peel Works, Adelphi, Salford, Electrical Engineer, do
hereby declare the nature of this invention and in what manner the same is to
be performed, to be particularly described and ascertained in and by the follow-
ing statement;
-
Reference being also had to the accompanying explanatory drawing in which
Figure 1 is a front or plan view of our improved electrical selector switch show-

page_text: ing a longitudinal view of same projected therefrom, Figures 2 and 3 are similar
views of slightly modified forms of such selector switch and Figures 4 and 5
detached views to enlarged scale of the special contact studs we employ.
Our invention relates to an improved form of electrical switch, and is more
especially applicable to that class of switch used in telephonic or telegraphic
circuits for selective purposes, and is designed to afford a ready means of indicat-
ing the circuits for selection and also to form an efficient guard to the switch
lever or arm.
Referring more particularly to Figure 1 it will be seen that in carrying our
invention into practice, the contact studs of the switch are formed with a
deep circumferential groove wholly (Figure 4) or partially (Figure 5) there-
around and the end of the contact arm or switch lever A is arranged to enter the
grooves c in the studs b and to make contact with the upper or the lower surface
of the grooves c or with both of them, in which latter case the end of the lever A
might be laminated. The contact arm or lever A can be either moved over an
arc of a circle or in a straight line the studs being arranged to suit. The upper
surfaces of the studs bare engraved with numbers or other distinctive marks
as may be desired or they may be suitably recessed so as to receive labels or
tablets numbered or marked. It will be seen that the studs 6 afford ready
means of identification of the several circuits they are put into connection with;
and the switch arm or lever A fitting into the grooves of the studs and making
contact therewith, is also afforded protection from undue strain, as the lever
cannot be forced away from the studs and the necessity for providing a separate
guard plate is entirely obviated.
Figure 2 shews the lever A brought over the stud b, a hole in the lever
permitting the number selected to be readily seen, the spring a under lever A
making contact.
Figure 3 shews a slightly modified form to the foregoing. In this instance
the studs bare without grooves and serve as number or label carriers only, con-
tact being made on plates extending beyond the studs preferably by a spring a¹.
Figures 4 and 5 are enlarged and detached views of the studs one (Figure 4)
being shown with a circumferential groove extending all around same, the
other (Figure 5) with a larger groove but formed only partially around the
stud b.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is.
1. In an electrical selector switch the combination of a contact lever or arm
with grooved contact studs, the grooves serving to afford contact surfaces for
the said lever or arm and an efficient guard all as and for the purpose herein-
before fully described and shown with reference to the accompanying drawings.
2. In an electrical selector switch the combination of a contact lever or arm
with studs as described having figures, letters, or other distinctive marks formed
thereon or attached thereto substantially as herein described, and shown in the
accompanying drawings.
Dated this 3rd day of July 1900.
№ 1900.
BENJ. T. KING, A.I.M.E.,
Registered Patent Agent
165, Queen Victoria Street, London, E.C.,
Agent for Applicants.