IMPROVEMENTS IN WINDOW SASH AND CASEMENT FASTENERS
Year: 1870

page_text: PROVISIONAL SPECIFICATION left by John Banks at the Office of the
Commissioners of Patents, with his Petition, on the 9th August 1870.
I, JOHN BANKS, of Cockermouth, in the County of Cumberland, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN
WINDOW SASH AND CASEMENT FASTENERS," to be as follows:-
My Invention relates to improvements in window sash and casement
fasteners, whereby the fastener may be firmly secured in the locked or
closed position, so as to effectually prevent its being opened from the
outside.
According to one arrangement I mount the knob or handle, by which
the fastener is operated on a vertical stem or pin, which passes completely
through the movable arm or bolt of the fastener. This pin or stem is
enlarged at the base and is capable of limited movement through said
bolt, from the under side of which it projects. A recess is formed in the
front or catch plate within the bracket in which the bolt is received
when the fastening is closed, said recess being preferably preceded by an
inclined plane, by which the stem and with it the knob or handle is first
caused to rise through the bolt, which is countersunk on the under side to

page_text: receive the base of the stem, the latter being then allowed to drop into
the recess formed for its reception. The bolt is thus locked or secured in
the closed position from which it can only be moved by lifting the knob
or handle. A similar inclined plane and recess may also be provided in
the rear or latch plate to retain the fastener in the open position, so as to
enable the spring usually employed to be dispensed with.
According to another arrangement I provide the knob handle with
a stem having two legs, each of which is received in a slot, made
longitudinally in the bolt, in which it is capable of sliding. The one leg
(that at the extremity of the bolt) passes completely through and projects
from the under side of the bolt and when slid forward takes into an
inclined recess or catch provided in each plate at either extremity of the
course or quadrant described by the bolt, the latter may thus be securely
locked either in the open or closed position, as before described.
According to a third arrangement the knob handle is mounted on a
screwed stem received in a corresponding screwed socket in the bolt.
By turning the bolt say, 1 of a turn its lower end will be projected into
the recess provided for its reception, and the bolt locked as before.
Whatever means of locking be employed, I mount the bolt on a pin or
fulcrum riveted or otherwise fixed to the rear or latch plate. The bolt is
secured on its pin by a nut, a fixed washer being interposed to prevent
the nut unscrewing by the movement of the bolt.
Another improvement in sash fasteners consists in providing a series of
teeth or serrations on the catch plate or that which is carried on the
lower sash, a corresponding serrated surface being formed on the lower
surface of the bolt which engages with the teeth of the catch plate when
the fastening is closed, so as to form a rigid connection between the
meeting bars of the sashes to prevent the latter being rattled by the
wind when loosened by the shrinking of the woodwork.