Improvements in Window Sash Fasteners.
Year: 1897

page_text: Date of Application, 26th Oct., 1897-Accepted, 4th Dec.,
1897
COMPLETE SPECIFICATION.
Improvements in Window Sash Fasteners.
I, ARTHUR MELBURNE TYLER, Clerk, of 1009 Floyd Avenue, Richmond, in the
County of Henrico, and State of Virginia, one of the United States of America,
o hereby declare the nature of this invention, and in what manner the same is
o be performed, to be particularly described and ascertained in and by the
ollowing statement:
The object of this invention is to provide a sash fastener which will lock auto-
matically when the sashes are closed by either raising the upper sash or lowering
he lower sash, the construction and arrangement of the parts presenting a lock
of this general character which is simple, cheap and effective. With the above
objects in view, the invention consists in providing the meeting rails of the sashes
with a lock comprising a swinging cam-dog carried by the lower rail of the upper
sash on a shaft having a flattened side and turning wheel, and a projecting
flexible arm carried by the upper rail of the lower sash which engages the
flattened portion of the shaft and acts to automatically throw the cam-dog in its
locked position. The invention further consists in the particular construction
and arrangement of the parts.
In the following specification, I have entered into a detail description of the
invention, reference being had to the accompanying drawings and to letters or
numerals thereon which designate the different parts, and what I consider to be
the novel features of construction are specifically set forth in the claims.
In the accompanying drawings forming part of this specification.
Figure 1 is a perspective view showing the application of my invention.
Figure 2 is a sectional view through the parts forming the lock.
Figure 3 is a detail view of the plate which carries the flexible arm.
Figure 4 is a detail view of the support for the swinging cam-dog.
Figure 5 is a detail view of the shaft.
The part of the lock which is carried by the upper sash and includes the
swinging cam-dog consists of a base plate 1 having a projection which supports a
swinging cam-dog 2, the said projection presenting side pieces 3-3 between
which the cam-dog is pivoted and a stop 4 which limits the rearward movement of
the dog when lowered, its backward movement when raised being limited by the
end wall 5 of the projection. The cam-dog is rigidly connected to a shaft 6
which bears in transverse openings 7 in the side pieces 3-3 and has a projecting
portion 8 forming a flat surface so disposed with relation to the cam-dog that it
will be horizontal and at the forward part of the shaft when said cam-dog is
thrown to the limit of its upward movement. At the end of the shaft opposite the
enlarged portion thereof is attached a knob or milled wheel 9 by which the shaft
is manually operated when the sashes are to be raised or lowered. The portion
of the shaft which is automatically operated to lower the dog is preferably disposed
at the left hand side of the cam-dog support while the knob is located on the
opposite side thereof.
The other part of the lock, or that which is carried by the upper rail of the lower
cech consists of a plate 10 having a raised portion 11 at one end forming a seat or

page_text: socket 12 in which is placed an arm 13 projecting beyond the sash, the said arm
being held in place by a top plate 14 and machine screw 15 which coufines the
parts. Adjoining the enlarged portion of the plate 10, the upper surface thereof
is roughened, and in connection therewith the large or free end of the cam-dog
is also roughened, as shown. The plates forming the base of both parts of the
lock are provided with countersunk holes to receive the retaining screws by which
they are fastened to the meeting rails of the window sashes.
In attaching the parts to the sashes the projecting flexible arm 13 will be so
arranged with respect to the enlarged or flattened portion of the shaft which
carries the cam-dog that it will engage said flattened portion when the sashes are
manipulated. In a locked position, the dog is lowered and the larger or free end
thereof will bear against the plate 10 and prevent the said sashes being moved,
thereby forming a lock which is very secure and cannot be released by passing an
implement up between the meeting rails. To release the lock, the shaft is turned
manually by means of the wheel to throw the cam-dog in an upright position,
and a movement of either sash will allow the arm to pass by the shaft, an opposite
movement of the sash causing the arm to engage the flattened projecting portion
of said shaft and throw the cam-dog forward so that it will lower by gravity and
engage the plate of the other sash. It will therefore be seen that by the particular
construction and arrangement of the parts forming the lock, the sashes are auto-
matically locked when closed and the operation of releasing the cam-dog or lock
is readily and conveniently accomplished. It will also be noted that a lock con-
structed as herein shown and described provides one that is strong and durable.
Instead of having the end of the cam-dog roughened and a corresponding surface
given to the plate 10, it is obvious that the said parts could be provided with
teeth which would cause a positive engagement. Other modifications or changes
could be made in the construction without sacrificing any of the advantages of the
invention, and I therefore do not wish to limit myself to what is herein shown
and described, but reserve the right to make such modifications and changes as
are within the spirit of my claims.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is:
1. A sash lock comprising a swinging cani-dog carried by the meeting rail
of one of the sashes and adapted to be lowered to engage the adjoining rail of the
other sash, substantially as shown and described.
2. A sash lock, comprising a support attached to the meeting rail of one of the
sashes, and a cam-dog pivoted in the support and limited in its movements with
respect thereto, the said cam-dog when lowered engaging the meeting rail of the
other sash, substantially as shown and described.
3. In a sash fastener, the combination of a support carried by one of the sashes,
and a cam-dog mounted therein upon a shaft which is provided with a flattened
portion or projection; together with an arm projecting from the other sash, sub-
stantially as shown and described.
4. In a sash fastener, the combination of a support attached to one of the sashes,
a shaft journaled in the support and having a flattened portion or projection, a
cam-dog connected to the shaft and limited in its movements in both directions,
a plate attached to the other sash, and a flexible arm secured to the plate and
projecting beyond the sash, substantially as shown and described.
5. In a sash fastener, the combination of a support presenting stops, a shaft
journaled therein, and having a flattened portion or projection, a cam-dog attached
to the shaft and limited in its movements by the stops, and a knob or wheel secured
to one end of the shaft: together with a plate attached to the other sasa, and a
flexible arm projecting from the plate, substantially as shown ans described.
6. In a sash fastener, the combination with a cam-dog carried by one of the
sashes and attached to a shaft having a flattened portion or projection, of a plate

page_text: attached to the other sash and provided with a socket or seat, and a flexible arm
secured in the socket or seat and projecting beyond the sash, the end of the cam-
dog and part of the plate with which it engages being roughened, substantially
as shown and described.