Improvements in Sash Fasteners.
Year: 1888

page_text: Date of Application, 16th Nov., 1888
Complete Specification Left, 8th July, 1889-Accepted, 10th Aug., 1889
PROVISIONAL SPECIFICATION.
Improvements in Sash Fasteners.
I JOHN BURN of Watt Street Sparkhill near Birmingham in the County of
Warwick Tool Maker do hereby declare the nature of this Invention to be as
follows:-
My invention consists of the improvements hereinafter described in sash fasteners
by which improvements the action of the fasteners is rendered more efficient than that
of sash fasteners as ordinarily constructed and their manufacture economised.
In order that my invention may be the more readily understood I remark that a
sash fastener consists of an arm turning on a joint on the meeting rail of the upper
sash which arm can be brought at right angles to the said rail thereby crossing the
meeting rails of both the upper and lower sashes and by engaging with the quadrant
carried by the meeting rail of the lower sash bind together or fasten the two sashes.
Or the said arm may lie parallel to the meeting rail on which it is fixed in which
position it does not interfere with the motion of the sashes. The arm is held with
considerable force in either of the two positions described by means of a spring against
which the heel or that part of the arm beyond the joint pin bears as is well under-
stood. In order to diminish friction the part of the arm bearing against the spring
has a roller.
In making a sash fastener according to my invention I form the arm from sheet
metal instead of forming it by casting as is usual. I make the said arm of three
I make
nearly parallel pieces of sheet metal having in outline the figure of the arm.
the bottom plate preferably of iron and the other two of brass but I do not limit
myself thereto. The bottom plate is flat. The middle plate is flat throughout the
greater part of its length but the part at and beyond the joint pin is raised into a
plane somewhat higher than but parallel to the other part. Similarly the third or
top plate of the arin is flat throughout the greater part of its length but the part at
and beyond the joint pin is raised into a plane parallel to the other portion of the
arm to double the height to which the corresponding part of the middle plate is
raised. These three plates are connected together by riveting or otherwise and when
so connected the parts constituting the arm proper are virtually solid while the parts
at and near the joint pin are separated from one another. The joint pin passes through
these separated parts and has a longer and consequently a steadier bearing than that
of the ordinary fastener. Between the separated parts of the bottom plate and
middle plate beyond the joint pin an anti-friction roller is situated and between the
like parts of the middle and top plates a second anti-friction roller is situated both
rollers turning on the same axis and bearing against the same spring. The bearing
of the two rollers on the spring conspires with the long bearing of the pin on which
the arm turns to preserve the motion of the arm in a horizontal plane and to prevent
the looseness or "play" which occurs after a little use in sash fasteners of the ordinary
kind.
Usted this 16th day of November 1888.
W. T. WHITEMAN,
Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Sash Fasteners.
I JOHN BURN of Watt Street, Sparkhill, near Birmingham in the County of
Warwick Tool Maker do hereby declare the nature of my invention, and in what
Pine Bl

page_text: •
manner the same is to be performed to be particularly described and ascertained
in and by the following statement :-
My invention consists of the improvements hereinafter described in sash fasteners
by which improvements the action of the fasteners is rendered more efficient than that
of sash fasteners as ordinarily constructed and their manufacture economised.
In order that my invention may be the more readily understood I remark that a sash
fastener consists of an arm turning on a joint on the meeting rail of the upper sash
which arm can be brought at right angles to the said rail thereby crossing the meeting
rails of both the upper and lower sashes and by engaging with the quadrant carried
by the meeting rail of the lower sash bind together or fasten the two sashes. Or the
said arm may lie parallel to the meeting rail on which it is fixed in which position it
does not interfere with the motion of the sashes. The arm is held with considorable
force in either of the two positions described by means of a spring against which the
heel or that part of the arm beyond the joint pin bears as is well understood. In
order to diminish friction the part of the arin bearing against the spring has a
roller.
In making a sash fastener according to my invention I form the arm from sheet
metal instead of forming it by casting as is usual. I make the said arm of three
nearly parallel pieces of sheet metal having in outline the figure of the arm. I make
the bottom plate preferably of iron or steel and the other two of brass but I do not
limit myself thereto. The bottom plate is flat. The middle plate is flat throughout
the greater part of its length but the part at and beyond the joint pin is raised into a
plane somewhat higher than but parallel to the other part. Similarly the third or top
plate of the arm is flat throughout the greator part of its length but the part at and
beyond the joint pin is raised into a plane parallel to the other portion of the arm to
double the height to which the corresponding part of the middle plate is raised.
These three plates are connected together by riveting or otherwise and when so con-
nected the parts constituting the arm proper are virtually solid while the parts at and
near the joint pin are separated from one another. The joint pin passes through these
separated parts and has a longer and consequently a steadier bearing than that of the
ordinary fastener. Between the separated parts of the bottom plate and middle plate
beyond the joint pin an anti-friction roller is situated and between the like parts of the
middle and top plates a second anti-friction roller is situated both rollers turning on the
same axis and bearing against the same spring. The bearing of the two rollers on the
spring conspires with the long bearing of the pin on which the arm turns to preserve
the motion of the arm in a horizontal plane and to prevent the looseness or
play'
which occurs after a little use in sash fasteners of the ordinary kind.
"
I will now proceed to describe with reference to the accompanying Drawing the
manner in which my invention is to be performed.
Figures 1 and 2 represent side elevations and Figure 3 represents in plan that
portion of a sash fastener fixed on the meeting rail of the top sash, the arin of the
said fastener being constructed according to my invention.
In Figure 1 the arm of the fastener is represented in its turned back or unfastening
position and in Figures 2 and 3 in its forward or fastening position; Figure 4
represents in side elevation and plan the arm of the sash fastener separately before
the guard and knob or handle have been attached to it; Figure 5 represents the
plates or pieces of sheet metal of which the fastener arm is composed together with
the rollers and the pin of the same; Figure 6 represents the guard detached and
Figure 7 the handle or knob detached.
The same letters of reference indicate the same parts in the several Figures of the
Drawing.
The arm of the sash fastener is composed principally of three nearly parallel plates
or pieces of sheet metal marked respectively a, b and c cut out at a press and
fashioned at their broad joint end and pierced at their joint and handle ends. The
bottom plate c is made preferably of iron or steel and the other plates a and b of
brass. It will be seen that the bottom plate c is flat but the joint end of the
other plates a and b are raised at a³, b³ into a higher plane than but parallel to

page_text: that of the other parts of the said plates a, b. It will also be seen that the part a
of the plate a is raised to double the height to which the corresponding part b
of the middle plate b is raised. At the joint end of each of the three
plates a b c is a piercing d for the joint pin e of the arm (see Figures 1, 2 and 3)
to pass through and also a piercing for the pin h of the rollers i, i to
pass through. The other end of each of the said plates abc is also pierced with
a square hole g for receiving the shank of the guard k (see Figure 6) by which the
three plates of the arm are rivetted together and also with a hole 1 for receiving the
shank of the knob or handle m (see Figure 7) of the arm.
In building up the arm composed mainly of the three plates a bc the flat parts
of the said three plates are laid upon one another in the manner represented in
Figure 4 and they are rivetted together by inserting the shank of the guard m in
the coincident holes at g and rivetting the said shank on the underside of the bottom
plate c. The handle m is then rivetted in the coincident holes at in the three
plates. When a guard k is not used the plates a, b, c may be rivetted together by pins
or otherwise connected together.
An armı virtually solid is thus made the parts at and near the joint being separated
from one another. Between the separated parts at the joint end of the arm, two
anti-friction rollers ii are passed the said rollers turning on the axis or pin h
which is passed through the coincident holes at f in the three plates and rivetted.
The arm thus made is jointed to the fixing plate n of the sash fastener by a long
joint pine passed through the coincident holes at d in the three plates and rivetted to
the fixing plate n as represented in Figures 1, 2 and 3. When the arm has been
jointed to the fixing plate n both of its rollers i, i bear on the ordinary plate
spring p at the back of the fixing plate n in the same manner as the single roller
of an ordinary cast arm bears upon its spring but in consequence of the bearing of
the two rollers i of my improved arm on the spring combined with the long
bearing of the joint pin of the said arm the motion of the said arm is very efficiently
preserved in a horizontal plane and looseness or play in the said arm is prevented.
When such fastener arms of large size and great strength are required the arm
may be composed of more than three plates of the same construction as the
plates a b, c but the additional upper plate or plates is or are properly shaped at the
joint end to separate it or them the required distance from the under plates for
receiving the additional roller or rollers turning on the same pin; and when a light
arm is required it may be composed of two plates only namely the flat bottom plate c
and the middle plate 6 or the top plate a, a single roller or two rollers in that case
being used. When the plates c and bare used a single roller is employed and when
the plates cand a are used two rollers or a broader roller may be employed and a
long bearing for the joint pin is produced.
Having now particularly described and ascertained the nature of my invention
and the manner of performing the same I declare that I claim as my invention
of "Improvements in sash fasteners":―
arm,
Making the sash fastener arm principally of two, three or more plates or pieces
of sheet metal rivetted or otherwise fixed together so as virtually to form a solid
the joint end of the plate or plates above the lower one being so shaped that it
or they is or are situated a short distance from the lower plate and from each other
for receiving between the said plates an anti-friction roller or rollers for bearing
against the spring of the sash fastener and also for producing a long and steady
bearing for the joint pin of the said arm substantially as herein before described and
illustrated in the accompanying Drawing.