Year: 1897

page_text: We, WILLIAM JAMES DAVY, and GEORGE THOMAS DAVIES, both of Horsell Road
Works, Highbury, in the County of London, Engineers, do hereby declare the
unture of this invention to be as follows:-
This invention for improvements in electrical switches relates to switches in
which a switch bar is rotated from one contact to another and has for its object
to prevent the sagging of the switch bars at their centres and to facilitate adjust-
ment for wear; and consists in inserting a helical spring between the switch bar
and the base, and surrounding the pillar projecting at right angles from the base
and carrying the switch bar; and in adjusting the height of the switch bar from
the base by means of nuts screwing on the top of the pillar and serving to force
downwards the switch bar against the resistance of the spring.
In one way of carrying out this invention, a pillar is mounted firmly on a suitable
base and projects vertically from it. A helical spring is then passed over the
pillar and rests on the base or on a collar on the pillar and on the top of the
spring is a loose washer. The switch bar is then placed on the pillar and forced
downwards by means of lock nuts to the required position. The switch bar is
thus firmly supported in its centre and can readily be adjusted for wear.
Dated this First day of Auril 1897.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.
We, WILLIAM JAMES DAVY, and GEORGE THOMAS DAVIES, both of Horsell Road
Works, Highbury, in the County of London, Engineers, 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 for improvements in electrical switches relates to switches in
which a switch bar is rotated from one contact to another and has for its object
to prevent the sagging of the switch bars at their centres and to facilitate adjust-
ment for wear; and consists in inserting a helical spring between the switch bar
and the base, and surrounding the pillar projecting at right angles from the base
and carrying the switch bar; and in adjusting the height of the switch bar, from
the base by means of nuts screwing on the top of the pillar and serving to force
downwards the switch bar against the resistance of the spring.

page_text: In one way of carrying out this invention, a pillar is mounted firmly on a suitable
base and projects vertically from it. A helical spring is then passed over the
pillar and rests on the base or on a collar on the pillar and on the top of the
spring is a loose washer. The switch bar is then placed on the pillar and forced
downwards by means of lock nuts to the required position. The switch bar is
thus firmly supported in its centre and can readily be adjusted for wear.
In the accompanying sheet of illustrative drawings, Fig. 1 is an elevation of
a switch constructed according to this invention and Fig. 2 is a plan of the same.
The pillar a is firmly fixed in the base and projects vertically upwards from it.
A helical spring c is then passed over the pillar a and rests on the collar d of the
pillar or on the base itself. A loose washer e is then passed over the pillar and
rests on the spring c. The switch bar f secured to the insulating handles y by
the screws his then placed on the pillar and is forced downwards against the
resistance of the spring into its proper position to make good and firm contact
with the contact pieces on the base and fixed there by the lock nuts i.
The switch bar f is rotated to make and break the contacts by means of the
handles g.
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 ia :-
1. A switch bar mounted between its contacts or ends on a pillar and supported
on a helical spring surrounding the pillar.
2. A switch consisting of a base, contacts on the base, a vertical pillar mounted
on the base, a coiled spring on the pillar, a switch bar mounted on the pillar, and a
means for forcing the switch bar down against the resistance of the spring.
3. The improvements in switches substantially as described.
Dated this 3rd day of January 1898.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.