Improvements in Davits.
Year: 1889

page_text: Date of Application, 9th Dec., 1889
Complete Specification Left, 9th Sept., 1890-Accepted, 11th Oct., 1890
Improvements in Davits.
I, LEONID RASKAZOFF, of No. 9 Moika, St. Petersburg, in the Empire of Russia,
Lieutenant Colonel in the Imperial Russian Navy, do hereby declare the nature of this
invention to be as follows:-
According to this invention I employ a jib more or less curved or straight and
pivotted by its one end to a platform, say the deck of the ship, or to a separate
foundation, say a vertical or inclined column or box.
This jib is capable of turning about its pivot in a vertical plane and is actuated by a
hydraulic cylinder and ram.
In one arrangement, for actuating the jib, I employ an oscillating hydraulic
cylinder. I pivot it to the platform and the head of the ram to the vertex of the
triangle formed by two rods fixed to the jib.
In another arrangement I employ a stationary cylinder which may form the above
mentioned foundation, to which the jib may be pivotted and I raise the jib by means
of a chain whose one end is fixed to the jib, and the other end after being passed over
a guide pulley is acted on by the ram.
The jib and the hydraulic ram form such a combination that the jib is capable of
turning in a vertical plane perpendicular to the side of a ship, from a position in
which the free end of the jib is lower than the pivoted end, and the jib is projecting
and hung overboard to a nearly vertical position in which the head of the jib is hung
over a place on the deck or bridge prepared for staying the boat to be lifted. For
lifting the boats by this arrangement I provide a fall which is attached to and hangs
down from the free end of the jib, and may be by its other end attached to the boat
by hook or in any other approved manner-when the jib is in the lowest position. So
that, when the jib is raised and turned by the action of the hydraulic ram the boat will
be also lifted by means of the fall.
In place of having single jib and cylinder I prefer, especially for boats to
employ a pair working together and preferably connected at their heads by a
beam which carries the falls." This arrangement allows the boat when raised to be
brought inboard between the jibs.
To lift the boat to a higher level than the platform I carry the chain or fall
over a pulley at the head of the jib and also over a pulley placed along its length
the end being attached to some fixed point below the jib, the effect of this is
that
as the jib is raised and recedes from the fixed point, it raises the load
relatively to the jib head at the same time as the jib head itself rises.
0+1.
Decolon 1000
Improvements in Davits.
I. LEONID RASKAZOFF, of No. 9 Moika, St. Petersburg, in the Empire of Russia,
Lieutenant Colonel in the Imperial Russian Navy, 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
According to this. invention I employ a jib more or less curved or straight and
pivotted by its one end to a platform, say the deck of the ship, or to a separate
foundation, say a vertical.or inclined column or box.
This jib-is capable of turning about its pivot in a vertical plane and is actuated by a
hydraulic cylinder and rain,

page_text: Figure 1 is a side elevation of the arrangement for lifting the load on to the platform
the jib being actuated by an oscillating cylinder.
Figure 2 is a side elevation of the arrangement for lifting the load above the platform
the jib being actuated by an oscillating cylinder.
Figure is a side elevation of the arrangement for lifting the load on to the platform
the jib being actuated by a fixed cylinder.
Figure 4 is a side elevation of the arrangement for lifting the load above the platform
the jib being actuated by a fixed cylinder.
In these figures a is the jib pivotted at a-b is the cylinder, in Figures 1
and 2 it is pivotted at -c is the ram. In Figures 1 and 2 the head of the
ram is pivotted to the junction of the rods d d. In Figures 3 and 4 the jib is
actuated by the chain e which passes over pulleys ff on the cylinder and ram,
the end of the chain e being fixed to the cylinder at eg is the fall, in Figures 1
and 3 it is fixed to the head a² of the jib a whilst in Figures 2 and 4 it is
fixed at hand passes over pulleys jj on the jib-k is the load (in the drawings
a boat) are the usual chocks to support the boat k.
In all the figures the jib is shown in one extreme position in full lines and in
the other extreme position in dotted lines the paths of the jib head and point of
attachment of the fall to the load being shown in lines consisting of alternate long
and short dots. The lines in Figures 2 and 4 consisting of long dots indicate
the fall in various positions of the jib showing how the upward motion of the
jib raises the load relatively to the jib head.
Figure 5 is a front elevation illustrating the way in which the arrangement
shown in the preceding figures are duplicated-a a are a pair of jibs which are
actuated as before described. Their heads are connected by the beam mg g are
the falls, those shown in full lines are fixed to the beam m and correspond to the
falls of Figures 1 and 3 whilst those shown in dotted lines pass over pulleys n n
and operate as described in reference to Figures 2 and 4.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:
1. The combination of a jib or arm pivotted at one end, mechanism for turning the
same in a vertical plane and a fall fixed at the end of the jib substantially as
described.
2. The combination of a jib or arm pivotied at one end, mechanism for turning the
same in a vertical plane and a fall one end of which is fixed at a point not upon the jib
and which is led over the head of the jib substantially as described.
3. Davits substantially as described and shown at Figure 1. .
4. Davits substantially as described and shown at Figure 2.
5. Davits substantially as described and shown at Figure 3.
6. Davits substantially as described and shown at Figure 4.
7. The duplicate arrangements substantially as described in reference to Figure 5.
1000
CARPMAEL & Co.,
Agents for the Applicant.