AN IMPROVED SPRING HAMMER FOR PLANISHING
Year: 1872

page_text: LETTERS PATENT to George Henry Procter, of No. 21, Benwell
Road, Highbury Hill Park, in the County of Middlesex, for the
Invention of "AN IMPROVED SPRING HAMMER FOR PLANISHING AND
Sealed the 5th November 1872, and dated the 11th September 1872.
PROVISIONAL SPECIFICATION left by the said George Henry Procter
at the Office of the Commissioners of Patents, with his Petition,
on the 11th September 1872.
I, GEORGE HENRY PROCTER, of No. 21, Benwell Road, Highbury
Hill Park, in the County of Middlesex, do hereby declare the nature
of the said Invention for "AN IMPROVED SPRING HAMMER FOR PLANISHING
AND HAMMERING METALS, AND OTHER PURPOSES," to be as follows :-
My Invention consists of a cylinder, in which is made to work a piston
with rod to receive a hammer head; a spring is made to act against the
piston (by preference a spiral spring although an elliptical spring would
serve). There is a plate on one end of the spring against which a set
screw or lever is used to regulate the weight of the blow.

page_text: The piston is actuated by one or more cams fitted on a shaft or spindle,
to which motion is communicated by means of a crank handle attached
to a fly wheel or a pulley driven with strap. A lever is fitted to lift the
hammer out of gear.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George Henry Procter in the Great Seal Patent
Office on the 11th March 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
HENRY PROCTER, of 27, Benwell Road, Highbury Hill Park, in the
County of Middlesex, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Eleventh day of September, in the
year of our Lord One thousand eight hundred and seventy-two, in
the thirty-sixth year of Her reign, did, for Herself, Her heirs and
successors, give and grant unto me, the said George Henry Procter,
Her special licence that I, the said George Henry Procter, my exe-
cutors, administrators, and assigns, or such others as I, the said George
Henry Procter, my executors, administrators, and assigns, should
at any time agree with, and no others, from time to time and at
all times thereafter during the term therein expressed, should and
lawfully might make, use, exercise, and vend, within the United Kingdom
of Great Britain and Ireland, the Channel Islands, and Isle of Man, an
Invention for "AN IMPROVED SPRING HAMMER FOR PLANISHING AND HAMMERING
METALS, AND OTHER PURPOSES," upon the condition (amongst others) that
I, the said George Henry Procter, my executors or administrators, by
an instrument in writing under my, or their, or one of their hands
and seals, should particularly describe and ascertain the nature of the
said Invention, and in what manner the same was to be performed, and
cause the same to be filed in the Great Seal Patent Office within six
calendar months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said George Henry Procter, do hereby
declare the nature of my said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and
by the following statement :-
:―

page_text: This Invention relates to a spring hammer so constructed that it
combines within its simple arrangements nearly all the essentials of a
steam hammer, and can be used by unskilled labor for planishing and
hammering metals and for other materials, and this with very great
rapidity and efficiency.
I have a cylinder in which is made to work a piston with rod to
receive a hammer head; a spring is made to act against this piston (by
preference a spiral spring although an elliptical spring would serve the
same purpose). There is a plate on one end of the spring against which
a set screw or lever is used to regulate the weight of the blow.
The piston is actuated by one or more cams fitted on a shaft or spindle,
to which motion is communicated by means of a crank handle attached
to a fly wheel or a pulley driven with strap. A lever is fitted to lift the
hammer out of gear.
And in order that this my Invention may be readily understood,
reference is made in the following detailed description to the accom-
panying Drawings, and to the letters and figures of reference thereon.
Fig. 1 represents a sectional elevation of the spring hammer, A being
the cylinder in which is made to work pistons B and C (one or both as
required) running in guides formed in the cylinder (see Fig. 2, a, a,)
with rod D having the hammer head E at its lower end; F is a spring
made to act against the top piston B by means of a plate G against
which is a set screw or lever H to regulate the weight of blow. Under
the piston C I place a spring I and plate K worked with rods L, to
which is attached a lever M or screw attachments to relieve the weight
of the blow from the upper spring or lift the piston B out of gear, or
above the cams N. I use also a pawl or lever O with or without spring
to lift and hold the piston off the cams at pleasure. The piston B is
lifted by one or more cams N fitted on a shaft or spindle P, to which
motion is communicated by means of a crank handle, treadle, back
gearing, or pulley driven with strap.
こ
Fig. 2 represents plan of cylinder; and Fig. 3 plan of rods L, L.
Fig. 4 represents the spring hammer in a modified form having the
pawl or lever O only as shewn, without the levers M and H and rods L,
as in Fig. 1. Attached to the wheel are fast and loose pulleys R, R.

page_text: I can do with or without piston C and its attachments, or with or
without part thereof, as the nature of the work to be performed may
require.
Having thus described the nature of my said Invention, and the
manner of carrying the same into effect, I declare that what I claim
and desire to be secured to me by the herein-before in part recited
Letters Patent is,-
Firstly. A cam lifting a plate or piston in guides with springs above
and below, as herein-before described.
Secondly. The use of springs in connection therewith, and the ]
tightening and slackening of the springs to alter the force of the effect
produced by levers and set screws.
And, thirdly. The general arrangement and combination of parts
forming my improved spring hammer for planishing and hammering
metals, and other useful purposes, substantially as herein-before described 1
and illustrated on the Drawings or any mere modification thereof.
In witness whereof, I, the said George Henry Procter, have here-
unto set my hand and seal, this Eighth day of March, in the
year of our Lord One thousand eight hundred and seventy-three.
GEORGE HENRY PROCTER. (L.S.)