CERTAIN IMPROVE
Year: 1873

page_text: LETTERS PATENT to Peter Boyd Eassic, of the Firm of William
Eassic and Company, Limited, of High Orchard, Gloucester, in the
County of Gloucestershire, for the Invention of "CERTAIN IMPROVE.
Scaled the 24th April 1874, and dated the 29th October 1873..
PROVISIONAL SPECIFICATION left by the said Peter Boyd Eassie at
the Office of thic Commissioners of Patents, with his Petition, on
the 29th October 1873.
I, PETER BOYD EASSIE, of the Firm of William Eassic and Company,
Limited, of High Orchard, Gloucester, in the County of Gloucestershire,
do licreby declare the nature of the said Invention for "CERTAIN Improve-
MENTS APPLIED TO PILE DRIVERS," to be as follows:-
My improvements consist in the use of an endless chain passing
through the monkey, and in a catch of a particular construction by
which the monkey is attached to and released from the chain.
My Invention will be readily understood by reference to the accom-
panying Slicet of Drawing, upon which Figure 1 represents an elevation

page_text: of a monkey fitted with my improved catch and portion of endless
chain I; Figure 2 is a view showing general arrangement of slip
drawn to an englarged scale; Figure 3, end view of same.
A is the monkey in which is a channel or passage B for chain
I to work through; 0, leader for monkey A to work in; D, stop
on same; E and F, bitts or stops working on the short shafts a, a, in
monkey A, and so arranged as to bite chain I when pulled in gear by
means of the cord g and lever G; G, lever for engaging bitts E and F in
the chain; H, lever for disengaging same; K, short arm or lever
attached to lever G working against the short arms or teeth fand f¹ on
bitt F.
Supposing the chain I, Fig. 1, to be travelling in the direction indi-
cated by the arrow and the monkey on the pile, to raise the monkey the
workman pulls the cord g throwing the bitt E into gear with the endless
chain by means of the lever G, and this again through the short arms K
and ff, causes the other bitt F also to take into gear therewith. The
monkey A is then carried up with the chain I until the lever H comes
in contact with the stop D sccured to leader C, when the two bitts E
and F arc opened and the monkey falls.
SPECIFICATION in pursuance of the conditions of the Letters Patent
filed by the said Peter Boyd Eassie in the Great Seal Patent Office
on the 28th April 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, PETER
BOYD EASSIE, of the Firm of William Eassie and Company, Limited,
of High Orchard, Gloucester, in the County of Gloucestershire, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-ninth day of October, in the
year of our Lord One thousand eight hundred and seventy-three, in the
thirty-seventh year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said Peter Boyd Eassie, Her
special licence, that I, the said Peter Boyd Eassie, my exccutors,
administrators, and assigns, or such others as I, the said Peter
Boyd Eassie, my exccutors, administrators, and assigns, should at any

page_text: 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 In-
vention for "CERTAIN IMPROVEMENTS APPLIED TO PILE DRIVERS," upon the
condition (amongst others) that I, the said Peter Boyd Eassie, 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 Peter Boyd Eassic, 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 :-
My improvements consist in the use of an endless chain passing
through the monkey, and in a catch of a particular construction by which
the monkey is attached to 'and released from the chain.
My Invention will be readily understood by reference to the accom-
panying Sheet of Drawing upon which Figures 1, 2, and 4, represent
clevations of a "monkey" embodying my Invention. Figure 3 a longi-
tudinal section, and Figures 5 and 6 transverse sections of the same.
"
a, a, are the usual guides or "leaders for the monkey or ram b, b,
the latter being held in position by the collared bolts d, d, and, the
“backboard” or plate e, e. The chain i, i, by which the "monkey" is
lifted passes from the back of the pile by a curved groove cut in the
monkey to its centre of gravity and is held there by the roller K
running freely on the pin n, and is by the usual suitable machinery kept
continuously moving in an upward direction from the base of the
machine to the top of same.
A little above the centre of the monkey
are two levers f, f, working on the pins m, m, geared together also by
the rocking studs h, h; one of these levers has on one side a handle to
which a rope is attached for the purpose of placing the lifting apparatus
in gear, and on the other a handle with stud p which when coming in
contact with the studs temporarily fixed at various heights in the leader
releases it from the chain. Both levers have cach a cable stopper g, I,

page_text: one on each side of the link in the chain, which on the lever handle
being moved in either direction clutches or releases the chain. The rope
attached to the lever may be done away with and weights attached or
other mechanism so as to render it self-acting.
The action of the pile driver is as follows:-Supposing the chain i
(Figure 1) to be travelling in the direction indicated by the arrows and the
monkey 6 on the pile to raise the monkey, the workman pulls the rope r
throwing the bit (cable stopper) g into gear with the chain i by means
of the lever f, and this again through the short arms (rocking studs)
h, h, (see Figure 3) causes the other bit g also to take into gear therewith.
The monkey is then carried up with the chain i until the lever f
(and stud p) comes into contact with the stop s secured to leader a when
the two bits g, g, are opened and the monkey falls.
Having now described and ascertained the nature of my said Invention
and in what manner the same is or may be performed,' I would have:
it understood that I do not confine myself to the precise details herein
given and illustrated on the accompanying Drawing, as such may be
varied while retaining the essential features of my Invention, nor do I
limit myself to the use of any particular metal or material in the con-
struction of the various parts of my improved pile driver, employing
such as in practice I may find most suitable, but what I claim as
secured to me by the herein-before in part recited Letters Patent is,-
Firstly. The use of the monkey 6 with crane chain i passing through
its centre of gravity, substantially as and for the purposes specified.
Secondly. The use of the cable stoppers g, g, constructed, combined, a
and operated, substantially as and for the purposes specified.
In witness whereof, I, the said Peter Boyd Eassie, have here-
unto set my hand and scal, this Twenty-seventh day of April,
in the year of our Lord One thousand eight hundred and seventy-
four.