Year: 1886

page_text: Date of Application, 19th Mar., 1886.
Complete Left, 18th Dec., 1886.
Complete Accepted, 18th Jan., 1887.
I JOSEPH WALKER of 4 Regent Parade Birmingham County of Warwick Brass-
founder do hereby declare the nature of this invention to be as follows:-
My Invention has for its object an improvement in the manufacture of frames for
Screw Rack Pulleys.
Instead of casting them in one Piece I make them from three pieces of Sheet
Metal, one piece being the long back Plate, and the other two pieces the Supports for
the ends of the Screw of the Rack. At one end of each of the two Supports I leave a
projection of a suitable size and shape to fit into a hole which I pierce at each end of
the back Plate, securing the said Supports in an upright position at right angles to the
back Plate by rivetting or other suitable process. At the other end of each of the two
Supports I pierce a hole of a suitable size and shape to receive and hold in position
the ends of the Screw of the Rack.

page_text: I, JOSEPH WALKER Brassfounder of 4 Regent Parade Birmingham in the county of
Warwick 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 improvements in the manufacture of the back plates and
supports for screws of rack pulleys for blinds, whereby I am enabled to make them
lighter, of a better finish and at less cost. Instead of casting the said back plates and
supports in one piece, I make them from sheet metal in three pieces, one piece being
the long back plate and the other two pieces the supports for the ends of the screw.
I will describe my process of manufacture. Having cut by press tools or otherwise
the back plate, which is usually of oblong shape four or five inches about three quarters
of an inch in breadth, I pierce a screw hole preferably at about three eighths of an
inch from each end of the said plate, the said holes are for the purpose of fixing the
rack pulley; I then pierce an oblong hole across each end of the plate at a distance of
about half an inch from the ends of the said plate, the width of the said holes being
slightly greater than the thickness of the metal from which the aforesaid supports are
cut, and the length of the holes being about three times their width. I then cut from
sheet metal the two supports for the ends of the screw, the length of the said supports
being about one inch and their width about half an inch near one end of the said
supports I pierce a round or other suitably shaped hole to receive and hold the ends of
the said rack screw, at the other end of the said supports I leave a projection of a
suitable size and shape to fit into the aforesaid oblong holes in the ends of the back
plate the said projections being long enough project through the said oblong holes
sufficiently to clench or rivet at the back of the said plate.
Having thus prepared the three parts I rivet or otherwise secure the two supports
for the rack screw to the rack plate, the said supports being at right angles to the
sides of the said back plate and having their two flat sides parallel and opposite to
each other.
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
The manufacture of the plates and end supports for the screw of screw rack pulleys
for blinds, from three pieces of wrought sheet metal and securing the said supports to
the back plate substantially as hereindescribed.
TACT TITTED