Improvements in Electric Switches.
Year: 1893

page_text: Date of Application, 13th Sept., 1893
Complete Specification Left, 13th June, 1894-Accepted, 25th Aug., 1894
PROVISIONAL SPECIFICATION.
Improvements in Electric Switches.
We, JOHN MACINTOSH MACKAY MUNRO, of The Munro's Electrical Manu-
facturing Company Limited, 9 Holland Place Glasgow, and JAMES MCFARLANE,
Manager of said Company, do hereby declare the nature of this invention to
be as follows:-
The object of this invention is to secure a quick break motion for an electric
switch.
"
"
or
One of the features of importance is that the controlling spring is dormant and
not under tension or strain of any kind when the switch is in the " on "off"
position, and only comes into action for a very short time when the switch is being
put into the on or "off" position. The spring is carried by the moving arm
or rod, and is not attached to any stationary or fixed part of switch.
According to one modification, it is used in combination with the well-known
piston switch, where by pushing the bottom knob of piston it is forced into the
position between the contact clips, and the spring is carried up along with
the piston. On pushing the top knob of piston the spring is compressed until the
piston is pushed out from between the clips, the break being in this way quick and
not liable to be retarded by the motion of the hand.
on
Dated this 11th day of September 1893.
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicants' Agents.
COMPLETE SPECIFICATION.
Improvements in Electric Switches.
We, JOHN MACINTOSH MACKAY MUNRO, of The Munro's Electrical Manu-
facturing Company Limited, 9 Holland Place, Glasgow, and JAMES MCFARLANE,
Manager of said Company, 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 :-
The object of this invention is to secure a quick break motion for an electric
switch.
"
"
One of the features of importance is that the controlling spring is dormant and
not under tension or strain of any kind when the switch is in the "on"
or "off"
position and only comes into action for a very short time when the switch is being
put into the " on or "off" position. The spring is carried by the moving arm
or rod and is not attached to any stationary or fixed part of switch.
According to one modification, it is used in combination with the well-known
piston switch, of which
Figure 1 is a plan with the cover on ;
Figure 2 a similar view with the cover removed and which is on
position; and
"Off"
on
"
Figure 3 a section of the piston showing our improvements applied thereto.
By pushing the bottom knob a of piston e the switch is forced into the "
position between the contact clips b. c, and the spring d is slightly compressed and
carried up along with the piston e. On pushing the top knob of piston e the
Poine d I

page_text: spring d is compressed until the piston e is pushed out from between the clips b, c,
the break being in this way quick and not liable to be retarded by the motion of
the hand.
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 :-
In electric switches, having the controlling spring carried by the moving arm
or rod and not attached to any stationary or fixed part of switch so that it is
dormant and not under tension or strain of any kind when the switch is in the
"on" or "off" position but only comes into action when the switch is being put
into the "on
or off" position substantially as described and shown on the
drawings.
"
મંદ
Dated this 12th day of June 1894
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicants Agents.