IMPROVEMENTS IN HYDRAULIC CRANES, HOISTS, AND THE LIKE MACHINERY "
Year: 1882

page_text: LETTERS PATENT to Edmund Priestman of Bakers Hill Sheffield Manufacturer
for an invention of "IMPROVEMENTS IN HYDRAULIC CRANES, HOISTS, AND
THE LIKE MACHINERY
"
PROVISIONAL SPECIFICATION left by the said Edmund Priestman at the
Office of the Commissioners of Patents on the 4th April 1882.
:
EDMUND PRIESTMAN, of Bakers Hill, Sheffield, Manufacturer IMPROVEMENTS
IN HYDRAULIC CRANES, HOISTS AND THE LIKE MACHINERY
My Invention relates to an improved lifting, lowering and hauling apparatus to
form part of hydraulic cranes, hoists, and the like machinery and has for its object
the multiplying the extent of motion of a piston and piston rod in a cylinder and
thereby elongating the lift, or hawl which may be performed by a single stroke, or
by a portion of single stroke of a piston, or piston rod.
My Invention consists in the use of a drum, or barrel carried by the piston rod
of hydraulic cranes, hoists and other like machinery and which drum or barrel is
revolved on the outward and inward stroke of the piston rod by pinions gearing
into a fixed rack guide. The chain from the crane, hoist, or like machine is
attached to and wound round the barrel, or drum. The outward action of the
piston rod causes the drum to rotate by means of its pinions and thus the drum
rolls in and multiplies the lift caused by the stroke of the piston rod. In like
manner the return stroke gives out the gathered in chain in excess of the stroke of
the piston.
Under another arrangement I rotate the drum, or barrel, carried at the end of
the piston rod by means of supplementary barrels which have a chain wound
round them in a reverse direction to the chain on the main barrel. The chain of
these secondary barrels is common to both the bight being led through a fixed
sheave, or sheaves. The action is: as the piston rod moves the main barrel, such
main barrel is rotated and its rolling in capacity is multiplied by the action of the
secondary chain and barrels.
The apparatus according to my Invention is especially applicable to hydraulic
cranes, hoists and like machinery where it is required to gather in a length of
chain, rope, or their equivalent, in excess of the stroke of the piston of the operating
cylinder.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Edmund Priestman in the Great Seal Patent Office on the
2nd October 1882.
EDMUND PRIESTMAN, of Bakers Hill, Sheffield, Manufacturer
IN HYDRAULIC CRANES, HOISTS, AND THE LIKE MACHINERY
"3
"IMPROVEMENTS
My Invention relates to an improved lifting, lowering and hauling apparatus to
form part of hydraulic cranes, hoists and the like machinery and has for its object
the multiplying the extent of motion of a piston and piston rod in a cylinder and
thereby elongating the lift, or haul which inay. be performed by a single stroke, or
by a portion of single stroke of a piston, or piston rod.
My Invention consists in the use of a drum, or barrel carried by the piston rod
of hydraulic cranes, hoists and other like machinery and which drum, or barrel is-
revolved on the outward and inward stroke of the piston rod by pinions gearing
into fixed rack guides. The chain from the crane, hoist, or like machine is
attached to and wound round the barrel, or drum. The outward action of the
piston rod causes the drum to rotate by means of its pinions and thus the drum
rolls in and multiplies the lift caused by the stroke of the piston rod. In like
manner the return stroke gives out the gathered in chain in excess of the stroke
of the piston
Under another arrangement, I rotate the drum, or barrel carried at the end of
the piston rod by means of supplementary barrels which have a chain wound
round them in a reverse direction to the chain on the main barrel. The chain of
these secondary barrels is common to both, the bight being led through a fixed
sheave, or sheaves or separate charns may be used. The action is: as the piston
rod moves the main barrel such main barrel is rotated and its rolling in capacity
is multiplied by the action of the secondary chain and barrels.
The apparatus according to my Invention is especially applicable to hydraulic
cranes, hoists and like machinery where it is required to gather in a length of
chain, rope, or their equivalent, in excess of the stroke of the piston of the operating
cylinder.
The beforegoing being the nature object and purposes of my Invention, I will now
proceed to describe how the same may be carried out into practical effect and for
that purpose I have hereunto annexed a sheet of Drawings, which are marked
with letters and figures of reference corresponding with those in the following
explanation, like letters being used to denote the same, or corresponding parts
throughout the various views.
DESCRIPTION OF THE DRAWINGS..
Figure 1 is a elevation of an apparatus according to my Invention.
Figure 2 is a side view of Figure 1
Figure 3 is a elevation showing another arrangement of my Invention.
Figure 4 is a side view of Figure 3:
+
**སྐྲུསཙ
Figure 3 is a elevation showing another arrangement of my Invention.
Figure 4 is a side view of Figure 3.
Upon reference to the Drawings Figures 1 and 2 it will be seen that au apparatus
according to my Invention, consists of the drum, or barrel A carried by the fork B
at the end of the piston rod C of the hydraulic cylinder D of a hydraulic crane,
hoist, or other like machine, and which drum or barrel A is revolved on the
outward and inward stroke of the piston rod C by the pinions E which are on the
same axes F as the drum, or barrel A. The drum, or barrel A is fixed onto the
axes F and is rotated in the fork B by the pinions E, which gear into the fixed

page_text: rack guides H carried on the end of the cylinder D. The chain J from the crane,
hoist, or like machine is attached to and wound round the drum, or barrel A
passing over the sheave K at the other end of the cylinder D, the outward action
of the piston rod C causes the drum A by means of the pinions E and rack guides H
to rotate and thus the drum A rolls in the chain J and multiplies the lift caused
by the stroke of the piston rod C, in like manner the return stroke of the piston
rod-C gives out the rolled in chain in excess of the stroke of the piston rod C
In the arrangement shown at Figures 3 and 4, the drum A is rotated by the
supplementary barrels E which take the place of the pinions E in Figures 1 and 2.
In this case the rack guides H are dispensed with and the barrels E are rotated by
the chains H which are wound round the barrels E in a reverse direction to the
cbain J on the barrel A. One end of the chains H is attached to the barrel E and
the other end is attached to the end of the cylinder D as shown, or the chain. H of
the secondary barrels E may be common to both, the bight being led through a
fixed sheave or sheaves at the end of the cylinder D, or other stationary position.
The action of this arrangement is as the piston rod C moves, the barrel A is
rotated by the unwinding of the chains H from off the barrels E and thus the
rolling in capacity of the barrel A is multiplied. On the return stroke the
unwinding of the chain J from off the barrel A causes the chains H to be re wound
on the barrels E ready for the next. outward stroke.
Having now described my Invention and shown how the same may be carried
out into practical effect, I would have it understood that my Invention is not
limited to the precise details and dimensions of the apparatus shown in the
Drawings, but what I claim as my Invention and secured to me by Letters Patent
as aforesaid is:
First In hydraulic cranes, hoists and like machinery effecting the gathering in
of the lifting chain by a barrel carried on the end of the piston rod, which barrel
is rotated on its outward and inward travel by means of a rack and pinion motion,
or its equivalent as herein described and shown in the Drawings hereto annexed.
Second The improved arrangement and construction of apparatus for hydraulic
cranes hoists and like machinery substantially as herein described and shown at
Figures 1 and 2 of the Drawings hereto annexed.
Third The improved arrangement and construction of apparatus for hydraulic
cranes, hoists and like machinery substantially as herein described and shown at
Figures 3 and 4 of the Drawings hereto annexed.
In Witness whereof, I, the said Edmund Priestman have hereunto set my
hand and seal this Twenty second day of September, in the year of our
Lord, one thousand eight hundred and eighty two.
EDMUND
(L.S.) PRIESTMAN