Improvements in Locks or Fastenings for Window-sashes, Doors, and the like.
Year: 1891

page_text: Date of Application, 20th June, 1891
Complete Specification Left, 18th Mar., 1892-Accepted, 23rd Apr., 1892
PROVISIONAL SPECIFICATION.
Improvements in Locks or Fastenings for Window-sashes, Doors,
and the like.
WILLIAM MARK HOLDOM, 3 Arlington Road, Surbiton, Surrey, Cabinet
Maker. I do hereby declare the nature of this invention to be as follows:-
For improvements in locks and locking box plate combined for window-sashes,
doors and the like, and in what manner the same is to be performed to be described
and ascertained by the following statements.
My invention is a device embodied in the construction of a lock with an elliptical
rotary bolt and locking box plate combined and an arrangement for the double
locking of the end of the bolt.
The bolt is elliptical in form, and eccentric in its action. It revolves on a fixed
centre or on its own bosses into or on the sides of the lock-case. The bolt tapers a
little from the base to the end, and at the extreme end rounds off on both sides.
The elliptical shape of the inner and outer curves of the bolt vary in size.
The outer being the largest when in contact with the locking box plate are points
everywhere dead against the centre together with the balancing weight of the body
of the bolt which revolves from the centre of its greatest are giving to the bolt a
locking and drawing power combined, until the face of the locking box plate is
drawn close to the face of the lock.
The bolt passes out of the lock through the locking box plate into the lock and
by the key can be locked again.
The bolt can be operated by a handle or key from one or both sides of the lock
as required.
When the bolt is thrown it is locked apart from the second locking, when
unlocked the whole of the elliptical bolt has returned into the lock case, thus .the
face of the lock and locking box plate are left flush and smooth.
The lock and locking box plate are fixed to doors, and the like in the usual way.
For window sashes. I make the lock with a base plate on the bottom end with the
screw-holes in it for securing the lock to either end on the top of the bottom sash.
I construct a long plate with any number of boxes in it, for locking the window at
various set distances from the top and the bottom in the same manner as when
closed.
This plate containing the boxes f fix to the upright of the top sash opposite to
the lock, the lock engages with any of the boxes in the plate draws the top and
bottom sashes together, making them like one sash.
I find it impossible to part or unfasten the sashes from either side of the
window.
The same applies to the door lock.
When the bolt is thrown it is impossible to force the lock or draw the elliptical
bolt. It can only be done by a handle or key.
The advantages secured by the elliptical rotary bolt are that when the lock is
locked to the locking box plate it cannot be parted, and that the end of the bolt
cannot be operated upon by levers or picking appliances because it has returned
into the lock, and is covered by a shield, and its own balancing weight keeps it
locked.
The construction of the key is fine but strong to agree with the key-chambers
in the lock. The key that throws the bolt will also lock the bolt.
I purpose making the lock and locking box plate from any kind of metals best
suited for its various parts.

page_text: I do not restrict myself to the precise details herein described but to the principles
of the invention.
June 20th 1891
WILLIAM MARK HOLDOM.
COMPLETE SPECIFICATION.
Improvements in Locks or Fastenings for Window-sashes, Doors,
and the like.
I, WILLIAM MARK HOLDOM of 34 Arlington Road Surbiton Surrey Cabinet
Maker 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 consists of an improved form of lock or fastening for windows and
doors.
Hitherto one of the objections to the many forms of fastenings for windows has
been the difficulty experienced in producing a lock which will secure the window
in any one position and yet allow of its being open to any extent. My invention
forms a new and improved method of doing this as follows:-
I make a lock consisting of an elliptical. eccentric rotary bolt, which tapers
towards the end of its arm, worked in a circular manner by a key or handle, rivetted,
or rotated upon bosses formed upon the sides of the bolt set in the framework, the
said framework forming a case or half case which has a lug or extended base plate
for securing the lock to the top bar of the bottom sash of the window. Upon the
side bar of the upper sash, I fasten a plate, having holes corresponding to holes
which are formed in the case or half case, and through which the elliptical eccentric
rotary bolt is swung by means of a handle or key. The construction of the bolt
allows of its remaining locked or unlocked by gravity, owing to the bolt after
having passed the vertical centre-line, being kept in its position by the weight
of metal at the end. I form a pummel or boss near either end to act as a wedge
for, the bolt to ride on when locked or unlocked. The pummels or bosses are fixed
or set in the case by any suitable means.
The action of the bolt in locking, causes it to draw the sashes together.
For locks requiring greater security I form a slot near the end of my elliptical
eccentric rotary bolt into which an ordinary lock bolt enters, by being operated by
a key or spring.
My lock is equally applicable to windows doors and the like-a door lock being
cased in and secured to the door in the ordinary manner.
I do not bind myself to the precise details hereinbefore described.
Having thus described the nature of my invention, I will proceed to describe
more fully the manner of performing the same.
DESCRIPTION OF THE DRAWINGS.
Figure 1 shews the simplest form of my lock as applied to window sashes.
A is my improved elliptical eccentric rotary bolt which tapers towards the end of
its arm A both in width and thickness. B is the casing which is secured by means
of a lug to the top bar of lower sash, and to which the bolt A is rivetted or
otherwise fastened at B'. The upright bar B of casing has slots or holes through
which the bolt A swings. C is a handle operating the bolt A. D is a boss or
pummel for the bolt to ride upon when unlocked. D' is a similar pummel cr boss
for the bolt A to ride on when locked and which assists in keeping the bolt firm.
E is a plate of any suitable material with slots or holes E2 formed in it, throughout
its length, and into which the bolt A engages, thus locking the plate E and casing B
firmly together. The holes in plate E allow of the window being secured locked
whilst open at any distance.
Figure 2 is a general arrangement shewing the lock and locking plate E in

page_text: position on window. The casing B being secured to the lower sash by means of a
lug B².
Figures 3 & 4 shew a section and end view of a modification of Figure 1, having
an ordinary lock F engaging into recess K near the end of the elliptical eccentric
rotary bolt A, the lock being operated by means of a key G, for securing windows
and the like.
Figure 5 is a view with side plate removed shewing my improved bolt adapted to
an ordinary door lock arranged to be operated by a key. A is my improved bolt
which turns upon bosses formed upon the sides of the lock case, a key being inserted
in the centre of the bolt for locking or unlocking it. K is a recess which is formed
near the end of the bolt A, into which an ordinary spring lock F enters, thus
keeping the bolt A immovable. J is a plate which is screwed into the door frame
in the ordinary manner.
Figure 6 is a cross section through Figure 5 shewing the method of operating the
bolt by means of a key inserted from either side.
Figure 7 is a similar section but arranged for the bolt being turned either by a
key or handle H.
Figures 8 & 9 are outside views of lock, and locking plate J, for doors and
the like.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. The construction of a lock with an elliptical eccentric rotary bolt in combina-
tion with a locking plate, the lock revolving on a centre formed either by a rivet
or bosses formed on the case or framework, or on the side of the bolt substantially as
described.
2. The elliptical eccentric rotary bolt so constructed that its balancing property
will hold it, alike in its locked and unlocked position substantially as specified.
3. The construction of an elliptical eccentric rotary bolt lock without pins to
hold the working parts.
4. The construction of an elliptical eccentric rotary bolt in combination with a
locking plate with any number of holes or slots in it, for the locking of window
sashes in various positions substantially as described.
5. The construction of a chamber or slot in the elliptical eccentric rotary bolt
near the end for the reception of an ordinary bolt as hereinbefore described.
Dated this 18th day of March 1892.
W. M. HOLDOM,
Applicant.