IMPROVEMENTS IN POWER HAMMERS TO BE DRIVEN BY BELTS OR SIMILAR MEANS
Year: 1878

page_text: LETTERS PATENT to Gilbert Glossop, of Sheffield, in the County of York,
Manufacturer, for the Invention of "IMPROVEMENTS IN POWER HAMMERS TO BE
DRIVEN BY BELTS OR SIMILAR MEANS."
Sealed the 2nd May 1879, and dated the 4th November 1878.
PROVISIONAL SPECIFICATION left by the said Gilbert Glossop at the Office
of the Commissioners of Patents on the 4th November 1878:
GILBERT GLOSSor, of Sheffield, in the County of York, Manufacturer.
PROVEMENTS IN POWER HAMMERS TO BE DRIVEN BY BELTS OR SIMILAR MEANS."
"IM-
This Invention relates to power hammers that are driven by a belt or similar
means (in contradistinction to steam hammers), and has for its object the production
of hammers of very compact arrangement and few parts, effective in work, and
with a simple motion to vary the force of the blow. In carrying out my Invention
a suitable frame or standard is provided with vertical slides for the tup or hammer
head to work in.
Thé tup is lifted by a lever or arm working on a fulcrum, and actuated by a
suitable cain on the driving shaft, the cam being placed by preference between the
fulcrum and the tup. The end of the lever or arm works in a slot formed in the
tup, and is so shaped that the lifting action is always in a vertical line through
the centre of the tup. To assist the quick return or fall of the hammer a spring is
placed between the top of the tup and the frame, but by preference so that it only
comes in contact with the tup when it is nearly at the top of the stroke..
The variation in the force of the blow is accomplished by means of a friction strip
which is pressed against the side of the tup, thereby retarding its motion. The
lever and mechanism to effect this is, by preference, under the control of the
operator's foot.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
_the_said Gilbert. Glossop-in--the Great Seal Patent Office on the 3rd May
_1879.
GILBERT GLOSsor, of Sheffield, in the County of York, Manufacturer.
PROVEMENTS IN POWER HAMMERS TO BE DRIVEN BY BELTS. OR SIMILAR MEANS."
"IM-
The said Invention relates to power hammers, or such hammers as are driven by
a belt or other similar means in contradistinction to steam hammers, and has for its
-object the production of such hammers in a very compact form and of comparatively
few working parts, and possessing a simple arrangement by which the force of the
blow can be varied by the foot of the operator without altering the speed of the
hammer.
And in order that the said Invention may be fully understood I shall now
proceed more particularly to. describe the same, and for that purpose shall refer to
the several Figures on the annexed Sheet of Drawings, the same letters of reference
indicating corresponding parts in all the Figures. Fig. 1. of the Drawings is a front
elevation of a power hainmer constructed according to my Invention; A and A¹ are
the standard, which may be either cast on the base plate B or secured to it in the
usual manner, they are further secured by the cap C. The anvil block D. carries
the anvil E; F is the tup; G is the lever or arm, having its fulcrum at H, and its
rounded end G¹ bears on two removeable blocks I, I, let into suitable recesses in the
tup F; by this arrangement the lifting action is in a central line through the tup.
The short end of the lever or arm G is acted upon by two springs J, J, regulated by
the screws K, K, so as to balance the tup and reduce the work of the cam to a
minimum, the cam L may have one or more "lifts "as may be desirable; it is secured
to and revolves with the shaft M, to which are also secured the fly wheel N and
driving pulleys. The tup is provided with guide strips O, Figs. 2 and 3, working
in grooves in the standards; P and P' are two friction blocks, having a suitable
spring between them; R is a wedge shaped slide, which is raised and lowered by
the action of the treadle S through the rod T and lever U. The spring V acts
on the rod T, drawing it down, and consequently forcing the wedge R upwards;
W is a strong spring, by preference of rubber, secured in the casing X, against
which the tup is propelled by the action of the cam L on the lever G, causing the
tup to rebound with much greater force than it otherwise would do; Fig. 2 is an
enlarged front elevation of the tup and the friction motion; Fig. 3 is a side
elevation of the same, and on the same scale, the position of the blocks shows the
haminer raised and supported out of the reach of the action of the cam L.
The working of the hammer is as follows:-The motive power being applied the
operator presses down the treadle and releases the tup, the shaft M. revolves, and
with it the cam L, which coming in contact with the lever G raises it with the tup.
When the point of the cam is passed the tup drops, the speed however at which the
tup is lifted by the cam propels it considerably higher than the cam itself, and it
strikes against and compresses the spring W, the reaction of which greatly
accelerates the fall, and increases the fall of the tup. To obtain a lighter blow the
pressure of the operator's foot on the treadle is partially withdrawn, and the action
of the spring V on the friction blocks through the rod T causes a pressure on the
long strip, see Fig. 2, retarding the action of the tup, and if the operator's foot is
entirely withdrawn from the treadle the tup is caught at its highest point, and held
by the friction blocks suspended out of reach of the action of the cam L till pressure
on the treadle again releases it.
Having now described and particularly ascertained the nature of the said
Invention, and the manner in which the same is or may be used or carried into
effect, I would observe in conclusion that what I consider to be novel and original,
and therefore claim as the Invention secured to me by the hereinbefore in part

page_text: recited Letters Patent is, the application and use in power hammers to be driven
by belts or other similar motive power,-
First. A lever having one end working between two blocks, surfaces, or their
equivalents in the tup, and the other end controlled by springs of any suitable shape
or material for the purpose of balancing the tup, substantially as described and
illustrated.
Second. The application and use of friction blocks to be pressed against the side
of the tup, for the purpose of retarding its action, and enabling the operator to vary
the power of the blow, and also to stop its action altogether, substantially as
described and illustrated.
Third. The general construction and arrangement of the several parts herein-
before described, as applied to power hammers.
In witness whereof, I, the said Gilbert Glossop, have to this my Specification
set my hand and seal, this Thirtieth day of April, in the year of our Lord
One thousand eight hundred and seventy nine.
CIT DDA στρα
GILBERT GLOSSOP.
GLOSSOP. (L.S.)