Improvements in Apparatus for Lowering Boats from the Sides or Decks of Ships:
Year: 1887

page_text: Date of Application, 13th June, 1887
Complete Left, 13th Mar., 1888.
Complete Accepted, 20th Apr., 1888
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Lowering Boats from the Sides or
Decks of Ships:
I, GEORGE HOLMES HAYLAR of 36 Malpas Road, New Cross, in the County of
Kent Engineer, do hereby declare the nature of this invention to be as follows:-
-
This invention relates to an improved construction of apparatus for lowering boats
from the sides or decks of ships being intended to supersede the ordinary davit.
At suitable distance apart, according to the size of the boat, two pedestal brackets
are fixed to the deck of the ship. Upon each of these brackets is pivoted or
fulcrummed an arm of semicircular form or thereabouts carrying at their extremities
pullies or runners for the suspending tackle and also provided with cleats for securing
the same. The arms are mounted on a shaft working in bearings formed in the
brackets. To one arm is attached a segment of a toothed wheel gearing with a worm
capable of being turned by a winch handle and by turning this handle the boat which
is suspended between the arms may be lowered until it is level with the deck or gun-
wale of the ship and then let down into the water by ropes and sheaves in the ordinary
manner. In cases of emergency the worm may be thrown out of gear for which
purpose one end is mounted in a swivel bearing and the other in a bearing working
in a slot and secured by a binding screw and nut.
When the worm is out of gear the descent of the arms is controlled by means of
a break acting on a break wheel or segment thereof mounted on the axis supporting
the arms.
To prevent the boat from swinging when not required for use short lever-
arms are mounted on the cross shaft or axis curved in the opposite direction to the
supporting arms and when the boat and supporting arms have been brought to their
usual position on board the short arms are raised until they embrace the outer side
of the boat and then secured by pins or other means.
Dated this 0th dev of June 1887

page_text: Decks of Ships.
I, GEORGE HOLMES HAYLAR, of No. 36 Malpas Road, New Cross, in the County of
Kent, 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 :-
This invention relates to an improved apparatus for lowering boats from the sides
or docks of ships; and is intended to supersede the ordinary davit.
According to my invention, I fix the davits upon a horizontal shaft which is adapted
to be turned about its axis, by suitable gearing, through the proper angle for clearing
the ship's side.
In order that the said invention and the means by which the same is to be carried
into practical effect may be thoroughly understood I will now describe it and them
in detail referring in so doing to the accompanying figures which are to be taken as
part of this specification, and read therewith.
Fig. 1 is an end elevation; and Fig. 2, a part front elevation; illustrating my
invention and its application. The full lines shew the boat and its apparatus in a
position of rest. The dotted lines shew the relative positions of the respective parts
when the boat has been swung out over the gunwale, clear of the ship, and partially'
lowered.
A is one of a pair of pedestal brackots held firmly upon the deck by any suitable
devico.
The distance at which they are set apart is decided by the length of the boat.
B is one of a pair of arms, each of which is adapted to turn upon the ends of a
shaft, C, or upon equivalent bearings formed on the pedestal brackets.
The arms are made conveniently of the semicircular form illustrated in Fig. 1.
One of them is continued past its axis into an arm, a, which is adapted by any
convenient device, e.g., a chain, a¹, to be releasably fastened to the adjacent pedestal.
The other arm is prolonged into a toothed segment, D, with which engages a
worm, E, provided with a winch handle, F, or other suitable device, for the purpose
of rotating it.
The upper extremities of the arms B, B, are provided with suitable tackle for
suspending, lowering, and raising the boat. F' is a lever; and, f, a pin projecting
from the end thereof and adapted to engage with the segment, D, by being passed
through a hole in it into a socket in the pedestal, A, for the purpose of, in conjunction
with the chain, a', above described, holding the arms, B, in the position illustrated by
the full lines of Figure 1.
The shaft of the worm, E, is illustrated as adapted to be rotated in fixed bearings ;
but I wish to point out that I do not confine myself to this detail of construction,
inasmuch as the said shaft may be adapted by any well known or suitable device, e.g.,

page_text: by having the bearing e releasable from the pedestal, A, on unscrewing the nut e¹ to
be instantaneously moved out of the position illustrated, for the purpose of disengaging
the worm, E, from the segment, D, in cases of emergency. The boat would then, as
soon as both arms were free to move on their axes, move, out and drop by gravity.
I provide a brake device for the purpose of regulating the motion of the boat. This
consists of a brake segment, G, a brake block, g, and a lever, g¹. The latter may bo
fixed to the pedestal, A, by means of the screw of the loose bearing, e. H is one of
a pair of short arms furnished with suitable chocks, h. They are mounted upon the
shaft, C, and adapted in respect of their shape to partially embrace the boat bottom
when the arms, B, are up and to therefore prevent it from swinging about. Pins, or
any equivalent device, are provided for fixing them in the position illustrated by the
full lines of Fig. 1.
I do not confine myself to the use of two arms, B, as herein before described,
inasmuch as only one may be used, as for the purpose of raising and lowering smaller
weights than a ship's boat, e.g., an anchor, or a kedge.
The method of using my invention is as follows.
The chain, a', and pin, f, are disengaged; and the arms, H, dropped. The worm is
rotated in the proper direction, when the arms, B, will move outwards about their"
axis, C, until the boat is in the position indicated by the dotted lines of Fig. 1. The
act of lowering is completed by means of the usual tackle.
In cases of emergency, e.g., the occurrence of an accident to the gear by which
the arms are moved, tho said gear is thrown out, and the weight of the boat and
its load will take it over the side, its motion being controlled by the application of
the brake.
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. The combination of an arm from which a boat may be suspended, an axis about
which the arm may move in a vertical plane, and toothed gearing by which the arm
may be moved.
2. The combination of two arms adapted to move about a horizontal axis common
to both, suspension tackle by which a boat can be hung from the upper extremities
thereof, wheel gear by means of which the said arms can be moved about their axis,
consisting preferably of a toothed quadrant connected with one of the said arms and
a worm adapted to engage with and operate the same, substantially as described with
reference to the accompanying figures.
3. The combination of arms adapted to move about a horizontal axis, a brake
device for checking their motion, and toothed gear adapted to effect their return
motion.
Dated this 12th day of ML 1000