Year: 1896

page_text: Date of Application, 27th Nov., 1896
Complete Specification Left, 6th Aug., 1897-Accepted, 18th Sept., 1897
We, Max BYNG, Electrical Engineer, and FRANCIS GEORGE BELL, Electrician, both of
Nos. 69 71, Queen Victoria Street, in the City and County of London, do hereby
declare the nature of this invention to be as follows:-
Our invention relates to certain improvements in electrical switches and has for its
object the retention of the switch bar or lever in contact position relatively to any
contact pin or point within its range.
In order that our invention may be clearly understood, we have appended the
accompanying sheet of drawings in which Figure 1 is a plan view, and Figure 2 an
end sectional elevation of a switch, and Figure 3 is a sectional view of a modification
thereof.
In carrying our invention into effect we employ a switch arm or lever L, pivotted
at D, and connected so as to make electrical contact with certain contact pins or
plates c. An index plate K which may or may not be marked or divided to
correspond to the contacts c is fitted upon an Z shaped base which is screwed or
otherwise attached to the stand A. Said index plate K is necessarily segmental, and
the semi circular channell formed by the projection of the upper flange allows of a
projection upon the switch lever L passing freely beneath it so that when it is
inoved upon the pivot D by the handle H, any tendency to raise it out of the plane
of contact is obviated, without imposing undue friction upon the switch arm or
lever L. An index I may, or may not be attached to coincide with the several
divisions of the segmental plate K. We prefer to place washers or distance pieces w
between the wood or other hase A of the switch, so that dust or other accumulation of
matter may freely pass through. In Figure 3, we show the segmental plate K
screwed to the base A by the interposition of washers or collars W.
The essential feature of our said invention is in the provision of a projecting lug r
engaging with, but normally free from contact with, a segmental or quadrant shaped
flange or plate, either outside or inside the radius of the contact pins, plates or the
like c.
FREDK. WALKER,
73, St. Stephen's Road, Upton Park, London, E.,
Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Electrical Switches.
We, Max BYNG, Electrical Engineer and FRANCIS GEORGE BELL Electrician, both
of Nos. 69-71 Queen Victoria Street, in the City and County of London, do hereby
declare the nature of this invention and in what manner the same is to be
Uni 077

page_text: performed, to be particularly described and ascertained in and by the following
statement:-
Our invention relates to certain improvements in electrical switches and has for
its object the retention of the switch bar or lever in contact position, relatively to any
contact pin or point within its range.
In order that our invention may be clearly understood we appended a sheet of
drawings to our Provisional Specification in which Figure 1 is a plan view, and
Figure 2 an end sectional elevation of a switch, and Figure 3 is a sectional view of a
modification thereof. Similar letters of reference are used to denote corresponding
parts throughout the several views.
In carrying our invention into effect we employ a switch arm or lever L pivotted
at D and connected so as to make electrical contact with certain contact pins or
plates c. An index plate K, which may or may not be marked or divided to correspond
to the contacts c, is fitted upon a Z shaped base l, with a flange w which may be
perforated to clear the contacts of dust, which is screwed or otherwise attached to the
stand A. Said index plate K is necessarily segmental, and the semicircular channel
formed by the projection of the upper flange allows of a projection or prolongation ?
formed upon, or attached to the switch lever L passing beneath it, and being retained
by it as said lever is turned upon the pivot D. by the handle H, so that any tendency
to raise it and so to break contact during said movement is obviated without undue
friction. An index I may, or may not be attached to coincide with the several
divisions of the segmental plate K.
In Figure 3 we show the segmental plate K screwed to the base A, by the inter-
position of washers or collars W.
The essential feature of our said invention is in the provision of a projecting lug
or prolongation ?, engaging with, but normally free from contact with a segmental
or quadrant shaped flange or plate K, either outside or inside the radius of the contact
pins, plates, or the like c.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is ;-
First. In an electrical switch the combination of a lug or prolongation attached to
the pivotted switch lever, with a segmental flange or plate arranged above the
contacts to prevent lifting substantially as herein described and shown by the
appended drawings.
Second. In an electrical switch the arrangement of parts, and construction thereof
substantially as and for the purposes herein described, with reference to the
appended sheet of drawings.
Dated this 4th day of August 1897
FREDK, WALKER,
73, St. Stephens Road, Upton Park, London, E.,
Agent for the Applicants.