IMPROVEMENTS IN MEANS OR APPARATUS EMPLOYED IN OPERATING BOATS ON SHIP-BOARD
Year: 1876

page_text: LETTERS PATENT to John William Rogers, of Liverpool, in the County of
Lancaster, Master Mariner, for the Invention of "IMPROVEMENTS IN MEANS
OR APPARATUS EMPLOYED IN OPERATING BOATS ON SHIP-BOARD."
Sealed the 3rd November. 1876, and dated the 28th August 1876.
PROVISIONAL SPECIFICATION left by the said John William Rogers at the
Office of the Commissioners of Patents on the 28th August 1876.
JOHN WILLIAM ROGERS, of Liverpool, in the County of Lancaster, Master
Mariner. "IMPROVEMENTS IN MEANS OR APPARATUS EMPLOYED IN OPERATING
BOATS ON SHIP-BOARD."
The Invention has for its object improvements in means or apparatus employed
in operating boats on ship-board, and relates to means for moving the davits in and
out, so as to carry the boat clear from the sides of the ship or to replace it on the
chocks, as desired. For this purpose I hinge the davits at their lower ends, as has
heretofore been proposod, and I operate them by screw gearing so as to actuate both
davits simultaneously by the rotation of a single shaft.
In carrying my Invention into effect I fix on each davit a toothed arc, the curve
of which is struck from the axis of the davit. This toothed arc is taken into and
driven by a toothed pinion fixed on a shaft or axis extending across both davits, so
that each arc is acted upon by a corresponding pinion on such shaft. A worm
wheel fixed on such shaft is taken into and operated by a worm or screw, on the
axis of which is mounted a handle by which it is rotated. The frames or standards
in which the horizontal shaft is mounted, or separate frames mounted one at cach
side of each davit, and serving as the boat's chocks, has formed thereon or fixed
thereto a stop to prevent the davits swinging out beyond the desired distance.
By these improvements a simple and efficient means is provided for operating the
davits simultaneously, whilst a single man or boy can work them, and at the same
time have them in perfect control.
0
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John William Rogers in the Great Seal Patent Office on the 20th
February 1877.
JOHN WILLIAM ROGERS, of Liverpool, in the County of Lancaster, Master
Mariner. "IMPROVEMENTS IN MEANS OR APPARATUS EMPLOYED IN OPERATING
BOATS ON SHIP-BOARD."

page_text: The Invention has for its object improvements in means or apparatus employed
in operating boats on ship-board, and relates to means for moving the davits in and
out, so as to carry the boat clear from the sides of the ship or to replace it on the
chocks, as desired For this purpose I hinge the davits at their lower ends, as has
heretofore been proposed, and I operate them by screw gearing so as to actuate both
davits simultaneously by the rotation of a single shaft.
In carrying my Invention into effect I fix on each davit a toothed arc, the curve
of which is struck from the axis of the davit. This toothed are is taken into and
driven by a toothed pinion fixed on a shaft or axis extending across both davits, so
that each arc is acted upon by a corresponding pinion on such shaft
A worm
wheel fixed on such shaft is taken into and operated by a worm or screw, on the
axis of which is mounted a handle by which it is rotated. The frames or standards
in which the horizontal shaft is mounted, or separate frames mounted one at the
side of each davit, and serving as the boat's chocks, has formed thereon or fixed
thereto a stop to prevent the davits swinging out beyond the desired distance.
And in order that my said Invention may be more clearly understood and readily
carried into effect I will proceed, aided by the accompanying Drawings, more fully
to describe the same
Figure 1 is a side view, Figure 2 is an end view, Figare 3 is a plan, and Figure
4 is a cross section representing my improvements in means or apparatus employed
in.operating boats on ship-board.
a, a, are the davits, which are hinged or pin jointed at their lower ends, as has
heretoforo been proposed, but instead of opeiating them separately, as has heretofore
been proposed, I operate them in the following manner, so as to raise or lower them
simultaneously by the rotation of a single shaft:-On each davit a is fixed a toothed
arc a², the curve of which is struck from the axis a¹. This toothed arc is taken into
and driven by a toothed pinion b¹ fixed on a shaft or axis b, extending across both
davits a, so that each toothed arc a is acted upon by a corresponding pinion 6¹ on
such shaft b. A worm wheel be fixed on such shaft 6 is taken into and operated by
a worm or screw c¹, or the axis c of which is mounted a handle or hand wheel by
which it is rotated. The frames or standards d, d, d, serve as the boat's chocks, and
the end ones have each fixed thereto a stop d¹ to prevent the davits swinging out
beyond the desired distance.
By these improvements a simple and efficient means is provided for operating the
davits simultaneously, whilst a single man or boy can work them, and at the same
time have them in perfect control.
Having thus described the nature of my said Invention and the mode in which
I prefer to carry the same into effect, I would have it understood that I do not
claim mounting the davits on hinges at their lower ends, nor do 1 claim operating
such davits by mechanism when each davit is operated by separate gearing
independently from the other, but what I do claim is, operating the davits
simultaneously by the employment of mechanism of the character, substantially as
herein shown and described.
In witness whereof, I, the said John William Rogers, have hereunto set my
⚫hand and seal this Ninth day of February, in year of our Lord One thousand
eight hundred and seventy-seven.
J. W. ROGERS. (L.S.)