Year: 1894

page_text: Date of Application, 26th Feb., 1894
Complete Specification Left, 26th Nov., 1894-Accepted, 29th Dec., 1894
I, HOWARD CRUNDEN CLEAVER of 3 Eden Street, Hampstead Road,
London N.W. Furniture Manufacturer do hereby declare the nature of this
invention to be as follows: -
My invention relates to mortise locks for doors and drawers and to the mode of
fixing said locks.
The improvement in the lock relates particularly to the form of the casing
whereby the lock is adapted to fit in a mortise made by two borings of a centre bit
anger as hereafter described, and to the provision of keyholes whereby the lock is
adapted to be applied to a right or left hand door or cupboard or to a till drawer
or other similar receptacle.
The lock casing is made of approximately oval or such other form in cross
section that it will exactly fit into a mortise made by boring with an auger two
juxtaposed parallel holes which meet or run into each other throughout their length,
and then removing with a chisel the intervening ribs remaining. Or the sides of
the casing may be longitudinally fluted to adapt them to fit in the double hole thus
bored without removing the intervening ribs.
The lock casing whether flat sided or fluted may be made of sheet metal bent to
the required form or may be made of several pieces. The lock mechanism may
either be that of a dead lock, 2-bolt lock, latch lock or other kind and may be fixed
to the casing or to a separate frame fitting therein.
The casing is provided with an end plate which is to be countersunk in the edge
of the door or drawer in which the mortise is made, and this plate is preferably
made with semi-circular ends so as to adapt the countersink to be made by means
of a centre bit.
To adapt the same lock to a right or left hand door or to a drawer the casing has
three keyholes one in one side and two in the other the latter being at right angles
to each other for the passage of the key bit but coincident for the passage to
the stem.
I, HOWARD CRUNDEN CLEAVER, of 3, Eden Street, Hampstead Road,
London, N.W. Furniture Manufacturer, 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:—
!
My invention relates to what may be termed centre bit mortise locks for doors
and drawers, and to the mode of fixing such locks.

page_text: In the case of cylindrical tubular mortise locks, as heretofore 'made, the diameter
of the mortise has necessarily been limited by the thickness of the door or drawer
in which the mortise is to be made, and consequently the diameter of the lock has
been so restricted as to afford insufficient space for the mechanism, even of a lock
having only a single bolt much less of one having both a latch and dead bolt.
The object of my invention is to combine the facility of fixing afforded by a
centre bit lock with the advantages, as regards space, for the lock mechanism,
afforded by the ordinary form of mortise lock.
The improvement in the lock relates more particularly to the form of the outer
casing in which the lock is fitted and whereby the lock is adapted to fit in a mortise
made by two juxtaposed intersecting parallel borings of a centre bit or auger, and
to the provision of keyholes whereby the lock is adapted to be applied to a right
or left hand door or cupboard, or to a till drawer or other similar receptacle.
Reference is to be had to the accompanying drawings, forming part of this
Specification, wherein Figure 1 is a perspective view of the lock removed from its
outer case. Figure 2 is a similar view of the outer case alone. Figure 3 is a
similar view of the two parts combined for use. Figure 4 is a similar view of the:
mortise in the edge of a drawer, for the reception of the lock. These figures when
viewed in another position also serve to illustrate the applicability of the invention
to a cupboard or other door, the dimensions of the lock and mortise being, of
course, adapted to the purpose for which it is intended to be applied.
The same letters of reference indicate the same parts in all the figures.
The outer casing a of the lock is made of such form in cross-section (approximately
that of a figure of 8) that it will exactly fit into a mortise or double hole made by
boring with a centre bit or auger two juxtaposed parallel holes which intersect or
run into each other throughout their length, the intervening ribs not being removed.
This outer casing a may be made of sheet metal bent to the required form,
or of two segments of tube soldered together along the centre line of the case, or
- it may be in one piece of solid-drawn tube of the desired figure of 8 section, and
may, in either case, be closed at bottom.
b
The lock mechanism is contained in an ordinary inner case 6 provided with the
selvage or edge plate c, the mechanism being of the usual tumbler lever kind and
either that of a dead lock, two-bolt lock, latch lock, or other kind. This inner
case 6 fits tightly between the fluted sides or narrow median portion a¹ of the outer
case. The plate c, with which the inner casing bis provided, is to be countersunk
in the edge of the door or drawer d in which the mortise e is made, and this plate
is preferably made with semi-circular ends so as to adapt the countersink to be
made by means of a centre bit, as shewn in Figure 4. The projecting ends of this
plate have holes for the two screws by which alone the lock is fixed in position.
The edges of this plate care preferably bevelled, as shewn so as to be forced tightly
into the countersink and make a neat joint with the wood.
.
To adapt the same lock to be used indifferently on a right or a left handed
door, or to be applied to a drawer, the inner and outer casings a, b, have two
keyholes g, g', in one side and one in the other side. The keyholes g, g', are
coincident, so far as regards the passage of the stem, but are at right angles to one
another, as respects the part of the keyhole through which the key bit passes.
The key holes 9, 9', are parallel to the end plate c and therefore adapted for right
or left handed doors whilst the hole g¹ being at right-angles to said plate is suited
for a drawer so that in any case the keyhole in the door will be right way up.
The mode of forming the mortise e, e, and countersink for the plate c will be
evident, the ends of the countersink being first bored to a sufficient depth for the
plate cand then the two intersecting borings e, e, are made with the same auger to
a sufficient depth to receive the case a.
My improved lock is adapted to entirely supersede the ordinary side plate
cupboard or till lock with obvious advantages as regards rapidity of fixing, strength
and security.
It will be obvious that if greater space in the direction of the thickness of the

page_text: lock is required, the sides of the outer case a may be made less deeply fluted at the
sides and may, in fact, be quite flat, the outer case then having semicircular ends
and flat sides and the ribs in the mortise between the two borings e in that case
being removed by a chisel.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
.
1. The herein described improvement in mortise locks, consisting in the com-
bination, with a lock carried by the inner case b provided with the edge plate o, of
an outer casing of the form specified adapted to fit in a mortise made by two
parallel intersecting borings of an auger, as specified.
2. The herein described improved mortise lock adapted for use on a right or left
handed door or till drawer, which consists of a lock carried by the inner case b
enclosed in an outer case of the form specified, both inner and outer cases being
provided with keyholes arranged as described.
Dated this 26th day of November 1894.
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.