AN IMPROVED HYDRAULIC GANTRY
Year: 1878

page_text: LETTERS PATENT to Martin Atock, of Royal Canal House, Broadstone, in the
City of Dublin, Ireland, Civil Engineer, for the Invention of "AN IMPROVED
HYDRAULIC GANTRY."
Sealed the 2nd August 1878, and dated the 10th May 1878.
PROVISIONAL SPECIFICATION left by the said Martin Atock at the Office
of the Commissioners of Patents on the 16th May 1878.
"
MARTIN ATOCK, of Royal Canal House, Broadstone, in the City of Dublin,.
Ireland, Civil Engineer. "AN IMPROVED HYDRAULIC GANTRY."
"
My Invention of improved hydraulic gantrys consists of improved forms of hydraulic
gantrys which may be used for lifting locomotives, engines, railway rolling stock
generally, and other heavy weights, by means of an hydraulic cylinder, chains,
-pump, and cistern worked by hand, and may be described as follows:-The frame
is made of wood or iron, or wood and iron combined, consisting of four upright
pieces, affording support to a horizontal beam, from which the load to be lifted
depends. This framework is mounted upon four flanged wheels, to enable it to
travel upon lines of rail.
The hoisting gear consists of a hydraulic cylinder attached in any suitable
position on the frame, a chain or chains is attached to the end of the piston rod,
and made to pass over suitable pulleys to the load, when more than one chain is
used, a compensating cross head is affixed to end of piston rod and chains to ensure
an equal strain upon each chain.
The guide pulley on the horizontal beam may be mounted upon a carriage to
allow of the load being moved horizontally and laterally, or the hydraulic cylinder
itself may be secured in any position upon the horizontal beam, or mounted upon a
carriage and arranged to lift the load direct.

page_text: The pump and cistern consists of one of Tangye's improved pumps, in cistern
detached, or attached to frame at a convenient height from ground, with safety,
stop and release valves complete, with hydraulic pipe to top and bottom of
cylinder.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Martin Atock in the Great Seal Patent Office on the 14th November
1878.
MARTIN ATOCK, of Royal Canal House, Broadstone, in the City of Dublin,
Ireland, Civil Engineer. "AN IMPROVED HYDRAULIC GANTRY."
My Invention of an improved hydraulic gantry consists of improved forms of
hydraulic gantries which may be used for lifting locomotive engines, railway rolling
stock generally, and other heavy weights by means of an hydraulic cylinder, or
cylinders, chains, pump and cistern, worked by hand, and may be described as
follows: The frame, made of wood or iron, or wood and iron combined, consisting
of four upright pieces, affords support to a horizontal beam, or beams, from which
the load to be lifted depends. This framework is mounted upon four flanged wheels
to enable it to travel upon lines of rails.
The hoisting gear consists of an hydraulic cylinder or cylinders, attached in any
suitable position on the frame, a chain or chains is attached to the end of the piston
rod, and made to pass over suitable pulleys to the load; when more than one chain
is used, a compensating cross head is affixed to end of piston rod and chains to
ensure an equal strain upon each chain.
The guide pulley on the horizontal beam may be mounted upon a carriage, to
allow of the load being moved horizontally and laterally, or the hydraulic cylinder
itself may be secured in any position upon the horizontal beain, or mounted upon a
carriage, and arranged to lift the load direct.
The pump and cistern consists of one of Tangye's or other improved pumps, in
cistern detached, or attached to frame at a convenient height from ground, with
safety, stop, and release valve complete, and with hydraulic pipe to top and bottom
of cylinder.
And in order that my Invention may be fully understood and carried into
operation, I will proceed to describe the accompanying Sheets of Drawings, reference
being had to the figures and letters marked thereon.
Sheet 1, Figures 1 and 2, show side and end elevations of a gantry specially
applicable for lifting locomotives and other similar weights. The framework is
made of timber bound together with wrought iron; A and B are the cistern and
hydraulic pump respectively attached to the frame as shown. The compensating
cross head C connects the end of the piston rod to the threo lifting chains which
pass over the three guide pulleys d, d, à.

page_text: Sheet 2, Figures 1 and 2, show the same general arrangement as that on Sheet 1,
but with the frame constructed partly of timber and partly of iron, and is better
suited to places where head room is limited. A, A, are wrought-iron girders of
channel or other sections of iron. B, B, cast-iron caps, but these as well as the
upright legs may be constructed entirely of wrought iron. Figure 3 illustrates a
plan by which the hydraulic cylinder is suspended upon a carriage, to enable the
load to be traversed laterally. The cylinder is connected with the cistern bolow by
means of a flexible pipe; A is the carriage; B, the cylinder; and C, the flexible
pipe.
Sheet 3, Figures 1 and 2, show the application of two hydraulic cylinders arranged
on the one gantry for lifting railway carriages and wagons.
The cylinders A, A, are hung upon pins B, B, to enable them to adjust themselves
readily to the direction of the load; and there are pipes from each cylinder con-
nected to one pump and cistern, as shown at C. At the end of each piston rod,
chains, hooks, grapnels, or other means of attaching to the load may be used.
In witness whereof, I, the said Martin Atock, have hereunto set my hand and
seal, this Eleventh day of November, in the year of our Lord One thousand
eight hundred and seventy-eight.
MAAT