Improvements in Apparatus for Raising and Lowering Ships' Boats.
Year: 1890

page_text: Date of Application, 12th Apr., 1890
Complete Specification Left, 12th Jan., 1891-Accepted, 14th Feb., 1891
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Raising and Lowering Ships' Boats.-
We, WILLIAM MCGLASHLAN, Engineer, and JOHN PHILLIP RAWLINGS,
Engineer, both of 32, Commercial Street, Leith, in the County of Midlothian,
North Britain, do hereby declare the nature of this invention to be as follows:-
This invention which relates to improvements in apparatus for raising and
lowering ships' boats, has for its object to lift the boat from its position on the
chocks, and to carry the boat over the ship's side to any required distance with full
complement of passengers on board.
In the carrying out of our said invention we employ a wheel or quadrant and
worm gear for the purpose of giving a motion of partial rotation to a horizontal
shaft upon which the lower extremities of the davits are keyed or carried, so that
the davits by thus working on centres can be lowered down to carry the ship's boat
any distance from the ship's side with full complement of passengers, the davits
lowering the boat simultaneously as it is put out, thus saving the great stretch of
tackle as with ordinary davits; the screw gear can be made to work direct on to
the davits.
In lieu of carrying the davits directly upon the shaft, they may be mounted as
pivoted levers with operating arms between the davit and the shaft, for the purpose
of raising and lowering the davits, or the raising and lowering of the davits may
be effected in any other equivalent manner.
Dated this 11th day of Anril 1890.
JOHNSONS,
115, St. Vincent Street, Glasgow, Petitioners' Agents.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Raising and Lowering Ships' Boats.
We, WILLIAM MCGLASHAN, Engineer, and JOHN PHILLIP RAWLINGS,
Engineer, both of 32 Commercial Street, Leith, in the County of Midlothian,
North Britain, 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 :-
This invention which relates to improvements in apparatus for raising and
lowering ships' boats has for its object to lift the boat from its position on the
chocks, with full complement of passengers on board, and carry it to any distance
clear over the ship's side in much less time and with less labour than hitherto, and
which owing to its travel gives a much safer offing to the boat and its occupants
than those at present in use.
But in order that our said invention may be more readily understood and easily
carried into effect we will proceed to describe the same with reference to the
accompanying drawings, throughout which the same reference figures denote the
same parts.
Figure 1, Sheet 1, is an end elevation, and Figure 2, Sheet 2, a side elevation of
our said improved apparatus.
Referring to the said drawings, we employ a suitable worm gear arrangement A,
consisting of a worm a, keyed or otherwise secured on a small horizontal shaft a¹,
carried in bearings a², formed on or attached to a suitable bracket or standard a³,
the said shaft a, is provided at one end with a suitable hand lever or wheel a', so
as to enable the said worm a, to actuate a worm quadrant or wheel a³, keyed or

page_text: otherwise secured to the main horizontal shaft B, which is carried in suitable
bearings formed on or attached to the said bracket or standard a³, as also in suitable
bearings formed on or attached to the end brackets or standards C, which as well as
central standard a³, are firmly secured to the ship's deck by suitable means:
On each end of said main shaft B, we key or otherwise secure a lever or link D,
the other end of which is pivoted to the one end of an intermediate lever or
Hink E, connected or pivoted at its other end to a tail piece or arm F, formed on or
attached to each of the bent or other shaped davits G, which are pivoted at their
lower ends g, to the said end brackets or standards C, and provided at their top
ends g', with swivel links H, into which the ordinary tackle hooks J engage.
The
whole arrangement being such that on the worm gear arrangement A, being
actuated by means of hand, steam or hydraulic power the davits G, are caused to
rotate or partially rotate around their pivots and so lift the boat up out of the
chocks, and then clear of the sides until it reaches the position shewn in dotted lines
in Figure 1, when on being lowered by means of the ordinary tackle, the boat gets
a safer offing than hitherto, owing to the greater distance from side of ship.
Or in lieu of actuating the said davits by means of levers or links from the main
shaft we may if desired key the said lower ends of the davits direct on to the ends
of the main shaft, and thus dispense with the use of the links or levers.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
First. In apparatus for raising and lowering ships' boats, the arrangement and
construction of the worm gear arrangement A, whereby the pivoted davits G, are
raised or lowered through the medium of the shaft B, levers or links D and E,
and davit arms F, all substantially as and for the purposes hereinbefore described
and shewn in the accompanying drawings.
Second. In boat raising and lowering apparatus the arrangement and construc-
tion of the worm gear arrangement, actuating the davits direct through the medium
of a horizontal shaft or any mere modification thereof, all substantially as herein-
before described.
Third. The general arrangement and construction of the davits G, having
arms F, connected to and actuated from the main shaft B, by levers or links D and E,
whereby the boat is lifted up out of the chocks and then clear of the ship's side,
all substantially as and for the purposes hereinbefore described and shewn in the
accompanying drawings.
Fourth. The general arrangement construction and combination of the various
parts constituting our apparatus for raising and lowering ships' boats all
substantially as and for the purposes hereinbefore described and shewn in the
accompanying drawings.
Dated this 10th day of January 1801
JOHNSONS,
115, St. Vincent Street, Glasgow, Applicants' Agents.