Improvements in Apparatus for Working Dock Gates.
Year: 1891

page_text: Date of Application, 21st Feb., 1891
Complete Specification Left, 20th Nov., 1891-Accepted, 24th Dec., 1891.
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Working Dock Gates.
1, ROGER WRIGHT, of Elswick Works, Newcastle upon Tyne, Engineer, do
hereby declare the nature of this invention to be as follows:-—
A dock gate is commonly worked by two chains one for opening and the other
for closing operated by independent hydraulic cylinders or hydraulic engines.
Dock gates have also been worked by a single pivotted hydraulic cylinder the
head of whose ram is pivotted to the gate but this arrangement is objectionable
under some circumstances.
According to this invention 1 open and close the gate by two chains operated by
a single hydraulic or other cylinder.
Pivotted to the gate is a beam which works through a pivotted guide on the
dock wall. A crosshead fixed to the piston rod or ram of the cylinder carries two
sheaves or two sets of sheaves one for each chain.
The crosshead works in a guide frame fixed to the cylinder and at each end of
the frame there is a sheave or set of sheaves. One chain passes round the sheaves
at one end of the frame and one set of sheaves on the crosshead its ends being fixed
to the frame and to the gate or outer end of the beam. The other chain passes
round the sheaves at the other end of the frame and the other set of sheaves on the
crosshead its ends being fixed to the frame and to the inner end of the beam. Thus
when the crosshead moves in or out either one or the other chain is wound in whilst
the other is slacked out to an equal extent.
בדי
1
5711
1
CJAL
1001
ROGER WRIGHT.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Working Dock Gates.
ROGER WRIGHT, of Elswick Works, Newcastle-upon-Tyne, Engineer, do
hereby declare the nature of this invention and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:-
A dock gate is commonly worked by two chains one for opening and the other
for closing operated by independent hydraulic cylinders or hydraulic engines.
Dock gates have also been worked by a single pivotted hydraulic cylinder the
head of whose ram is pivotted to the gate but this arrangement is objectionable
under some circumstances.
According to this invention 1 open and close the gate by two chains operated by
a single hydraulic or other cylinder.
Pivotted to the gate is a beam which works through a pivotted guide on the
dock wall. A crosshead fixed to the piston rod or ram of the cylinder carries two
sheaves or two sets of sheaves one for each chain.
The crosshead works in a guide frame fixed to the cylinder and at each end of the
frame there is a sheave or set of sheaves. One chain passes round the sheaves at
one end of the frame and one set of sheaves on the crosshead its ends being fixed
to the frame and to the gate or outer end of the beam. The other chain passes
round the sheaves at the other end of the frame and the other set of sheaves on the
crosshead its ends being fixed to the frame and to the inner end of the beam. Thus
when the crosshead moves in or out either one or the other chain is wound in whilst
the other is slacked out to an equal extent.

page_text: DESCRIPTION OF THE DRAWINGS.
Figure 1 is a plan and Figure 2 a side elevation of an apparatus constructed
according to this invention. A is the hydraulic cylinder and B the crosshead,
fixed to its piston rod or ram, and working in guides C C connecting the cylinder
to the block D. E is a beam having one end pivotted to the gate F and which
passes through the guide G pivotted to the block D. The chain H has one end
fixed at to the cylinder and passes over the pulley on the crosshead, the
pulley a on the cylinder, the pulley on the crosshead, the pulley a² on the
cylinder and the pulley on the block and its other end is fixed to the gate at /.
The chain Jis fixed to the block D at j and passes over the pulley 2 on the cross-
head, the pulley d¹ on the block, the pulley on the crosshead and the pulley d²
on the block, its other end being fixed at to the beam E.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is :-
1. In apparatus for working dock gates the combination of a beam pivotted to
the gate, and passing through a guide on the wall a rope or chain fixed to the gate
or to the end of the beam next the gate, a second rope or chain fixed to the other
end of the beam and mechanism for simultaneously hauling in one rope or chain and
paying out the other.
2. Apparatus for working dock gates substantially as described and shewn in the
drawings.
Dated this 21st dove of Chat
1001
ROGER WRIGHT.