IMPROVEMENTS IN MACHINERY FOR MANU- FACTURING SCREW NUTS
Year: 1876

page_text: PROVISIONAL SPECIFICATION left by William Robert Lake at the Office of
the Commissioners of Patents on the 5th October 1876. A communication
from abroad by Heinrich Kusler, of Landstuhl, Rhein Pfuls, Germany, Engineer.
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. "IMPROVEMENTS IN MACHINERY FOR MANU-
FACTURING SCREW NUTS." A communication.
This Invention relates to improvements in the machinery for the manufacture of
metal nuts, for which former Letters Patent have been granted to me bearing date
the 22nd day of February, A.D. 1876, No. 725.
The machinery constructed according to my present Invention differs from that
described in the Specification of my said former Letters Patent chiefly in the
mechanism for severing the nut blanks from the bar. In my former machine the
cutters were arranged opposite the die, and each blank was severed by the cutters
entirely from the bar and pushed therefrom into the die, and at the same time was
punched and then discharged. But according to my present Invention the cutters
are arranged at one side of the axis of the die and do not sever the blanks
completely from the bar. The bar is cut nearly in two, say, within about 1/8 inch;
then the bar is pushed forward to bring the partially severed blank in line with the
die. The blank as it enters the die is sheared off and punched, and at the same
time the cutters are operating to partially sever another nut.
The said machinę
has two driving shafts, which I term the right and left hand shafts, and which are
provided with cams for operating punches, which I call the right and left hand
punches, and the other parts of the mechanism.
The
The cutter apparatus is mounted on a fixed bracket. The die plate is mounted
on a slide that moves and carries the bar to its position between the cutters; at the
same time the nut is punched then the die plate and slide move and leave clear
space for the nut to fall down and escape from the machine. The said slide and die
plate are operated by cams, as described in said former Specification, and the right-
band punch works through a hollow mandril that slides through the said die.
left-hand punch which is arranged at the other side of the die plate, as in the former
machine, is mounted in an adjustable block or carrier, behind which is placed a
strong spring which gives a yielding support to the said block and allows the same
and the punch to accommodate themselves to varying thicknesses of bars used for
the manufacture of the nuts. The said punch is operated by a cam on the left-hand

page_text: shaft, as in the said former machine. A stop is placed in the frame to limit the
movement of the said yielding block.
The cutters are mounted on- levers whose pins are fixed in a bracket, that is,
secured immovably on the frame or bed of the machine, and are arranged in suitable
positions with regard to the said slide, punches, and die. The upper lever is
arranged in connection with a long lever which is fulcrummed at the side of the
frame or bed, and which extends to a cam on the said left-hand driving shaft. The
lower cutter lever is connected with an arm on a countershaft placed below the
frame and connected by another arm and a rod with the said long lever. The
arrangement of the said levers is such that each movement of the said long lever
operates both of the cutters in the proper direction to act on the bar from which
the blanks are formed. The cutters are operated or pulled back by spiral or other
springs.
The aforesaid yielding block that carries the left-hand punch extends under the
driving shaft, and is formed with a recess to permit the cam that operates tho
punch to turn without obstruction, and at each side of the said slide and between
the same and the bearings or plummer blocks for the said shaft I place wedges
which serve for adjusting this slide and punch accurately in line with the opposite
or right-hand slide and punch. The said wedges are provided with tightening
BCтews..
The aforesaid spring for giving a yielding pressure to the block or carrier of the
left-hand punch is placed in a tray or receptacle which forms a continuation of the
frame of the machine.