An Improved Casement-fastener.
Year: 1890

page_text: Date of Application, 8th Aug., 1890
Complete Specification Left. 16th Dec., 1890-Accepted, 24th Jan., 1891
PROVISIONAL SPECIFICATION.
An Improved Casement-fastener.
I HORSEN BERIAH KELSEY, of Sheet near Petersfield in the County of South-
ampton do hereby declare the nature of this invention to be as follows:-
My invention relates to an improvement in casement fasteners of that kind in
which a bent lever pivoted to the one part or door engages with a staple fixed on
the other part or on the jamb, as the case may be.
Such fasteners, especially those of the more common make, are usually pivoted
upon a stud screwed into a base plate so as to be removable in order that the
fastener may be readily adapted to suit a right or a left handed casement or door
but which is apt to come unscrewed in use and so become injured or lost.
The object of my improvement is to obvinte this defect and to provide a form of
pivot stud which may be readily removed before its base plate or mounting is affixed
to the casement or door but which is so secured by the act of screwing on the
base plate that it cannot become accidentally disengaged.
For this purpose the stud has a head and a plain shank except that it is provided
at its inner end with laterally projecting bits and it is received in a plain socket
having longitudinal grooves to give passage to the bits, the stud being locked in
position by being partly turned round after being inserted through its socket.
In order to make this interlocking of the parts permanent when the fastener is
mounted, the inner end of the stud is bevelled or knife edged and projects beyond
the rear surface of the base plate or mounting so as to become embedded in the
wood-work on which the fastener is mounted.
The breadth of the knife edged or bevelled end of the stud is increased by the
bits which are formed in one therewith, the said edge being as much broader than
the stud as the depth of the grooves and thus adapted to effectually resist the
turning of the stud.
TL: 0th
August 1000
H. B. KELSEY.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.
COMPLETE SPECIFICATION.
An Improved Casement-fastener.
1 HORSEN BERIAH KELSEY of Sheet near Petersfield in the County of South-
ampton, 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 an improvement in casement fasteners of that kind in
which a bent lever pivoted to the one part or door engages with a slot or a staple
formed in or fixed on the other part, or on the jamb, as the case may be.
Such fasteners, especially those of the more common make, are pivoted upon a stud
which is usually fixed to the base plate by being screwed therein in order that the
stud may be readily removed for the purpose of adapting the fastener to suit a right or
a left handed casement or door. The stud when thus fixed is apt to come unscrewed,
by frequent use of the fastener, and so become injured or lost.
The obiect of my improvement is to obviate this defect and to provide a form of
pivot stud which may be readily removed so long as its base plate or mounting is not

page_text: affixed to the casement or door, but which is so secured when the base plate is thus
affixed that it cannot possibly become loose.
In order that the invention may be more readily understood, I have illustrated it in
the accompanying drawings, forming part of this Specification, wherein
Figure 1 is a front view of the fastener.
Figure 2 a rear perspective view of the base plate and pivot ; and
Figure 3 is a cross-section on line 1. 1. Figure 1, in the plane of the pivot and on an
enlarged scale.
The same letters of reference denote like parts in all the figures.
A is the bent lever, B the base plate, and (the pivot stud on which the fastener
works. The slot or catch with which the nose a of the fastener engages is the same
as usual and does not need illustration.
The stud C has a head c and a plain shank except that it is provided at its rear end
with laterally-projecting nibs or bits d and it is received in a plain socket in the base
plate B having longitudinal grooves to give passage to the bits d, the stud after
being inserted in the said socket being locked therein by being turned a quarter
round, as shewn in Figures 1 and 3.
In order to make this interlocking of the parts permanent when the fastener is
affixed to the casement the rear end of the stud is bevelled or knife-edged, as at e, and
projects beyond the rear surface of the base plate or mounting B so as to become
embedded in the wood-work on which the fastener is mounted, as shewn in Figure 3.
The knife-edge or bevelled end e of the stud is preferably in the same plane with the
bits d, so that it will be of sufficient breadth to effectually resist the turning of the
stud. The shank portion of the stud C is preferably slightly tapered, as shewn, and
the socket in the base plato is correspondingly formed whilst the bottoms of the
grooves b, are parallel,, as shewn, so that when the stud is inserted and turned round,
as described, it will be tightly held in its socket by the cone on the one hand and the
bite on the other. The extreme width across the bits & should not exceed the
diameter of that part of the shank of the stud Con which the lever A pivots, so that
the bits will pass freely through the pivot hole in the lever without the need of any
slots in the latter.
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. A casement fastener in which the pivot is fixed removably to its mounting or
base plate and has a sharp projecting edge at its rear end adapted to embed itself
in the wood-work to which the base plate is fixed and so prevent the turning of the
pivot stud.
2. In a casement fastener, the combination, with the grooved socket in the base
plate or mounting, of the pivot stud having nibs or bits adapted to pass through
the grooves and engage with the back of the base plate, and of a knife-edged inner
end adapted to embed in the wood-work, substantially as specified.
Dated this roth day of December 1890.
Dated this 10th day of December 1890.
H. B. KELSEY.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.