Improvements in Electrical Switches, particularly Suitable for High Voltage Connections.
Year: 1899

page_text: Date of Application, 19th June, 1899
Complete Specification Left, 19th Apr., 1900-Accepted, 19th May, 1900.
PROVISIONAL SPECIFICATION.
Improvements in Electrical Switches, particularly Suitable for High
Voltage Connections.
We, GEORGE WHITTAKER HOLT, of Colonial Buildings, Horse Fair, in the
City of Birmingham, Manufacturer, and ARTHUR ATHERLEY, of 71, Carlyle Road,
Aston, in the County of Warwick, Electrical Instrument Maker, do hereby declare
the nature of this invention to be as follows: -
This invention relates to improvements in the construction and arrangement of
switches for use upon low or high voltage electrical connections the object being
to produce a compact simple and efficient switch with a long leverage or range
of motion the working parts of which are well enclosed and protected from
contact with the cover. In carrying our invention into effect we mount our
actuating tumbler upon a pin or pivot which we pass through the boss like end
of the bridge like carrier which we secure to the base of the switch. The outer
end of this central boss we screw or thread to receive in the ordinary manner the
enclosing cap or ornamental covering. To the inner end of the tumbler we
secure in a rigid manner a fibre lever or fibre side arms for carrying the metal
brushes upon the outer or contact ends, and upon and about the outer ends of the
fibre arms we bend over or pin or rivet thereto the metal brush contact pieces,
making the metal strip to pass entirely over the upper or entering surface of the
fibre arms.
We recess or groove the base or carrier plate sufficiently to admit of the arm
entering from below instead of from above into the terminal contact arm or
arms, so as to obviate the possibility of its touching the cover when out of contact.
We place beneath the moving lever or fibre arm a spring or springs which acts to
keep the arm locked or snapped in or out of the switch contact surfaces. We may
attach the spring to a projection or projections formed in one with the base or
we may provide a suitable connecting stud boss or bracket surface upon the
bridge piece for this purpose.
Upon the arm or central carrier we form a slot, grooves or paths for the spring
to work against varying the form of path and seat for the spring to enter to suit
the type and shape of spring which may be employed. By this arrangement of
giving the moving brush a lower entrance into the terminal contact jaws we
reduce the size and extent of the projection necessary for enclosing the switch
and make a simple and efficient connection to the carrying bridge on to which the
cover or cap is fastened and reduce the possibility of derangement of the switch
arm when the cover is being attached or detached.
We modify the form of our manipulating lever and the arrangement of our
spring for securing the same to suit the terminals and other fittings which it
is desired to employ in connection therewith.
1721
LT 1900
MARKS & CLERK,
18, Southampton Buildings, London, W.C.,
13, Temple Street, Birmingham, &
25, Cross Street, Manchester. Agents for the Applicants.

page_text: Improvements in Electrical Switches, particularly Suitable for High
Voltage Connections.
ty
We, GEORGE WHITTAKER HOLT, of Colonial Buildings, Horse Fair, in the
City of Birmingham, Manufacturer, and ARTHUR ATHERLEY, of 71, Carlyle Road,
Aston, in the County of Warwick, Electrical Instrument Maker, 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 following statement:-
This invention relates to improvements. in the construction and arrangement
of switches, particularly for use upon high voltage electrical connections, the
object being to produce a compact, simple, and efficient switch with a long leverage
or range of motion and having the working parts well enclosed and protected from
contact with the cover.
↓
On the accompanying sheet of explanatory drawings to be hereinafter referred
to.-
I
Figure 1 is a sectional elevation representing a switch constructed in accordance
with our invention, with the operative parts in the out of circuit position, whilst,
Figure 2 is a similar view but showing the disposition of the said parts when
the switch is in circuit.
Figure 3 is an end elevation and Figure 4 a side elevation showing the bridge
like carrier alone.
.
Figure 5 is a side elevation and Figure 6 an end elevation showing the tumbler
alone.
The same reference letters in the different views indicate the same parts.,
In carrying our invention into effect we mount our actuating tumbler as A
upon a più or pivot B which we pass through the boss-like end of the bridge
like carrier C secured to the base of the switch. The outer end of this central
boss we screw or thread to receive in the ordinary manner the enclosing cap or
ornamental covering, not shown in the drawings. To the inner end of the
tumbler A we secure in a rigid manner fibre side arms as E E' for carrying the
metal brushes or contact piece F upon their free ends as illustrated, the metal
strip forming the contact piece F being made to pass entirely over the upper or
entering surface of the outer ends of the said fibre arms E È¹.
".
We form a recess or grooved in the base or carrier plate D to admit of the arm
entering from below, instead of from above into, or between, the terminals,
(mounted upon the base 1), thereby obviating the possibility of its touching the
cover when out of contact. One of the terminals is shown at G in Figures 1 and 2.
We place between the movable fire arms E E' a spring as H which acts to keep
then locked or snapped in the circuit position shown at Figure 1, or the out of
circuit position at Figure 2. We preferably mount the spring upon the small
lug or Bracket) secured to the base D. The free end of the spring H acts
against the front edge of the portion of the tumbler A interposed between the
fibre arms E E¹, as illustrated, and to which the said arms are rigidly secured."
By arranging for giving the moving brush or contact piece a lower entrance
into or between the terminals on the base or carrier plate D, we reduce the size
and extent of the projection necessary for enclosing the switch, make a simple and
efficient connection to the carrying bridge A on to which the cover or cap is
fastened, and reduce the possibility of derangement of the switch arm when the
cover is being attached or detached.
We modify the form of our manipulating lever, arm, or tumbler A and the
arrangement of the locking or retaining spring for the same, to suit varying
services or requirements

page_text: Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:
1
1. In electrical switches, arranging for the movable tumbler or contact piece.
to be inserted between or withdrawn from the terminals, mounted upon the base
or carrier plate, from the underside of the said terminals, substantially as and for
the purposes described.
2. An improved electrical switch particularly suitable for high voltage con-
nections, substantially as described and as illustrated.
MARKS & CLERK.
18, Southampton Buildings, London, W.C.,
13, Temple Street, Birmingham, &
25, Cross Street, Manchester. Agents for the. Applicants.