IMPROVEMENTS IN DOOR Locks
Year: 1873

page_text: LETTERS PATENT to George Tomlinson Bousfield, of Sutton, in the
County of Surrey, for the Invention of "IMPROVEMENTS IN DOOR
Locks." A communication from abroad by Christopher Moody, of
Toronto, Canada.
COMPLETE SPECIFICATION filed by the said George Tomlinson
Bousfield at the Office of the Commissioners of Patents, with his
Petition and Declaration, on the 6th June 1873, pursuant to the
9th Section of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
TOMLINSON BOUSFIELD, of Sutton, in the County of Surrey, send
greeting.
WHEREAS I am in possession of an Invention for "IMPROVEMENTS IN
DOOR LOCKS," and have petitioned Her most Excellent Majesty Queen
Victoria to grant unto me, my executors, administrators, and assigns,
Her Royal Letters Patent for the same, and have made solemn Declaration
that it has been communicated to me from abroad by Christopher
Moody, of Toronto, Canada.

page_text: NOW KNOW YE, that I, the said George Tomlinson Bousfield, do
hereby declare the nature of the said Invention, to be as follows :—
The Invention relates to an improved door lock in which all springs
are dispensed with, the "bolt" made reversible, and the whole lock made
of such a form and size as to require less than usual of the stile to be f
cut away, while at the same time it can be put in much firmer than any
other lock with which the Inventor is familiar.
other lock with which the Inventor is familiar.
DESCRIPTION OF DRAWING.
Figure I. sectional side view; Figure II. front view partially in
section.
GENERAL DESCRIPTION.
D is the bolt lever fastened to the centre of the crank axle C on either
end of which the cranks or levers B are attached at right angles to D,
the knobs 6 forming part of them as shewn; E is the bolt with circular
recesses cut in its top and bottom edges as shewn, the bolt lever D
fitting into the upper one, the lower one is exactly the same, and the
two ends of the bolt E being likewise similar, it follows that the said
bolt E can be reversed when the end first used has become too much
worn, as the cranks B and bolt lever D are fastened to the same axle C,
it follows that in moving either of the cranks B, D, is likewise effected
and as D is connected to the bolt E as shewn, the latter will also be
moved by the motion of the former; the cranks B having knobs 6 on
them and the other parts being arranged as shewn, the bolt E will
always be pressed out by the weight of the knobs b, when the lock is at
rest, while to open the door it is simply necessary to raise one of the
knobs, which action presses the bolt E back, as will be readily understood
by reference to Drawing. This is not simply a catch lock but can be
locked by the following simple contrivance; G is a sliding block which
works upon and is held in position by the pin K; F is a pawl pivotted on
the pin f, and resting on the sliding block G, as shewn in Drawing; when
the bolt E is locked the block G (is pressed forward by a key which is
inserted in the keyhole) forces and holds the end of the pawl F into the
bottom circular recess in the bolt E. In order to unlock the bolt press
the block G back in a similar manner, when as the small pin in the
pawl F (works in a slot in the block G), it will bring the pawl F down
and it will drop on the pivot f, and the bolt C can be worked as before.
The axle C is simply a square piece of iron on the centre of which is

page_text: hung the bolt lever D, the levers B being slipped on to each end as
shewn in order to form a bearing; the levers B have hubs which fit and
work in a collar on the plates a, as shewn; A, A, are outside plates which
cover the plates a and at the same time enclose the levers B, preventing
them being raised or lowered beyond the required distance, and also
holding the axle C in position.
In witness whereof, I, the said George Tomlinson Bousfield, have
hereunto set my hand and seal, this Sixth day of June, in
the year of our Lord One thousand eight hundred and seventy-
three.