provements in and relating to Switches for Electric Light.
Year: 1899

page_text: Date of Application, 31st Oct., 1899
Complete Specification Left. 24th May, 1903-Accepted, 18th Aug., 1900
PROVISIONAL SPECIFICATION
Improvements in and relating to Switches for Electric Light.
".
We, THOMAS BELL, of Hazeldene," Wellington Road, Eccles, Electrical
Engineer, and SAMUEL SIMPSON BERRY, of The Crescent," Salford, Elec-
trician, both in the County of Lancashire, do hereby declare the nature of this
invention to be as follows..
-
Our invention consists of a new and improved switch of the "tumbler" type
specially designed for use on electric light encuits of high voltage, but 18,also
suitable for low voltage circuits The special features of this switch being
that it is entirely made of metal and porcelain, no fibre or other insulating
material, except porcelain, being used in its manufacture. The two contact
pieces of this switch are separated by a porcelain bridge, thus preventing any
arcing or short-circuiting of the switch, the contact piece which connects the
terminals is made in the shape of a fork and is actuated by the porcelain handle
in a new and improved manner, by means of a sping (which is made with two
small spirals at each end, the loose ends of which pass under the contact piece)
which holds the switch in the "on" and "off" positions and prevents its
remaining in any intermediate positions between on and "off." The
bracket which supports the lever or contact maker is fastened to the porcelain
by means of a screw which clamps the bracket to a projecting portion of the
porcelain base so that no screw or metal portion of the same projects through
the porcelain base
Thated than 04th Ontahan 1000
46
33
COMPLETE SPECIFICATION.
Improvements in and relating to Switches for Electric Light.
We, THOMAS BELL, of " Hazeldene," Wellington Road, Eccles, Electrical
Engineer, and SAMUEL SIMPSON BERRY, of The Crescent," Salford, Elec-
trician, both in the County of Lancashire, 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.-
-
Our invention relates to a new and improved switch of the "tumbler" type
specially designed for use on electric lighting circuits of high voltage. but
18 also suitable for low voltage circuits.
The special features of this switch being the formation of the contact lever,
077

page_text: '
which enables the switch to be made with a very long break and great clearance
between the terminals, and any other metal part or the switch when in the
off" position, making it specially suitable for high voltage circuits
We will now proceed to describe our invention more particularly with refer-
ences to the accompanying diawings, in which amilar letters of reference
indicate like parts in all the figuies.
Figure 1, is a section on the line AB showing the switch
position
in the "
on
"
Figure 2, is part section and part elevation of the bottom portion of the
switch showing the switch in the off" position
Figure 3, is a plan of the switch with the cover removed
Figure 4, is a plan of the switch with the covel on
Figure 5, 18 a perspective view of the contact maker.
The base, a is made entirely at porcelain and 18 cucula in shape and is pro-
vided with a thread round its edge to receive threaded portion of the covei, g.
The top portion of the base, a 18 hollowed out to halt its depth and a porcelain
bridge, 6 divides this hollowed portion into two parts, and separates the two
brass fixed terminal pieces, c, c of the switch.
The base, a is also provided
with a projecting portion, d to which the bracket, e is attached by means of a
small screw, t The cover, g is made of porcelain and is circular and is pro-
vided with a threaded portion to engage with the base, a The switch lever or
contact makei, e 18 made in the shape of a fork as shown on Figure 5, and
18 pivoted to the bracket, e at the points, h, h This switch level, 18 toimed
with a projecting portion, which fits into a round hole in the porcelain
handle, k 1, are two terminals fitted with sciews for connecting to the electric
wires and secured to the base, a by means of nuts, r, r, which latter are let
into holes in the bottom of the base, a so that no portion of the metal part of
the switch projects below the base. m, m are two holes in the base, a for securing
the switch to the wall or other position. The switch level, 18 kept in the
"
on position by means of a small sping, which is made with a spiral at
each end, the projecting ends of each of these spirals passing in front of the
switch lever, when in the "off" position while the spring, n fits over the
pivot, o fixed between the two sides of the bracket, o. c, c are two pieces of
brass forming the fixed terminal portions of the switch
The switch is actuated by means of the porcelain handle, and is kept in the
"on" or "
off" positions by means of the spring n The switch lever, c¹ when
од position engages with the two pieces of brass, c, c thus connecting
the two terminals, 1, 1 The porcelain badge, b prevents any arcing o1 short-
circuiting of the switch, and no screw or metal portion of the switch projects
through the porcelain base, a
"
in the
"
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be actuated, we declare that
what we claim 18;-
1 A new and improved switch of the "tumbleı " type having the contact
lever which connects the terminals made in the form of a fork, with a cross
piece for the sping to act upon and on which there is a projection which
engages in a hole in the porcelain handle by which it is actuated, substantially
as, and in the manner described and illustiated in the accompanying specifi-
cation and drawings
DL
00 1 1
1
1000
E. G. ECKERSLEY,
Agent for Applicants.