IMPROVED OPERATING GEAR FOR SHIPS' DAVITS
Year: 1883

page_text: LETTERS PATENT to Henry. McCollin of 29 Wallwood Street, Burdett Road,
Limehouse in the County of Middlesex for an Invention of IMPROVED
OPERATING GEAR FOR SHIPS' DAVITS
PROVISIONAL SPECIFICATION left by the said Henry McCollin at the
Office of the Commissioners of Patents on the 21st May 1883.
HENRY MCCOLLIN of 29 Wallwood Street, Burdett Road, Limehouse in the
County of Middlesex IMPROVED OPERATING GEAR FOR SHIPS DAVITS
"
According to this invention the davits are operated by two screw jacks arranged
for moving them inward and outward as required, each davit working on a hinge
pin or pivot at its lower end. The screw jacks work in stationary bearings which
may be fixed to the deck, and the screw of each jack is connected at its upper end
by a suitable joint to the inner side of the corresponding davit. The two jacks
are geared together to ensure simultaneous action in working, an ordinary crank
handle being provided to each.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Henry McCollin in the Great Seal Patent Office on the
20th November 1883.
:
HENRY MCCOLLIN of 29 Wallwood Street, Burdett Road, Limehouse, in the
County of Middlesex IMPROVED OPERATING GEAR FOR SHIPS' DAVITS,
According to this invention the davits, are operated by two jacks arranged for
moving them inward and outward as required each davit working on a hinge pin
or pivot at its lower end.
Fig. 1 of the accompanying sheet of illustrative drawings shows in perspective
apparatus embodying my invention Fig. 2 is an end elevation, Fig 3 a vertical
section to an enlarged scale of one of the jacks, and Fig. 4 an elevation of the same
at right angles to Fig. is no
a, a, are the davits hinged or pivotted at their lower ends to supports a¹, a¹,
secured to the deck of the vessel. bb are two screw jacks working in stationary
bearings 66 at their lower ends: these bearings may be fixed to the deck. The
screw of each jack is connected at its upper end by a suitable joint c to the inside
of its respective davit for the purpose of operating the davit inward or outward as
required. The two jacks may with advantage be geared together, to ensure
simultaneous action, by a rod & the screw of one jack having a right-hand thread
and that of the other a left-hand thread. Ordinary crank handles e are provided
for operating the jacks. The rod d is fitted on to the square ended spindle of each
of the gear wheels f (Fig. 3) and the crank handles e, e one to the spindle of each
gear wheel g. The central gear wheel h of each jack acts as a nut for operating
the screw of the jack for the purpose of working the davit.
T
It will be evident that apparatus may be constructed in various forms to operate
on the principle of my invention as above set forth.
Having described the nature of the said invention and in what manner the same
is to be or may be performed or carried into practical effect I would have it
understood that what I consider to be novel and original and therefore claim as the
invention secured to me under the Letters Patent first hereinabove in part recited
is the use in combination with ships davits arranged to work on hinges or pivots of
jacks for operating the same substantially as hereinabove described.
In Witness whereof I the said Henry M'Collin have hereunto set my hand and
seal this nineteenth day of November in the year of Our Lord one thousand eight
hundred and eighty three.