Machine for Boring Rudders and Stern Posts of Vessels, and similar Pieces of Work where a Number of Projecting Pieces Require to be Bored in a Right Line.
Year: 1889

page_text: .Date of Application, 21st Sept., 1889
Complete Specification Left, 18th June, 1890-Accepted, 19th July, 1890
PROVISIONAL SPECIFICATION.
A Machine for Boring Rudders and Stern Posts of Vessels, and
similar Pieces of Work where a Number of Projecting Pieces
Require to be Bored in a Right Line.
1 PATRICK ROBERTSON of Viewfield, Johnstone, in the County of Renfrew,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to a machine for boring the gudgeon holes in rudders and
stern posts of vessels, and similar pieces of work where a number of projecting pieces
require to be bored in a right line.
For this purpose 1 employ a bed of sufficient length fitted with a traversing saddle
carrying a radial arm. This arm is fitted with a boring spindle at its outer end
driven by wheel gearing, and can be swung sufficient to clear the projections on the
piece of work.
The manner of operation is as follows-Having fixed the piece of work and bored
the first projection, the spindle is swung clear of the projection, the saddle is then
advanced to the next projection, and the boring proceeded with, and so in succession
till all the projections are bored.
The feature of novelty and usefulness claimed is the employment of the radial arm
in combination with the adjustable saddle, which allows any number of projections to
be bored with one setting of the piece of work.
Dated this 20th day of September 1889.
PATRICK ROBERTSON,
COMPLETE SPECIFICATION.
A. Machine for Boring Rudders and Stern Posts of Vessels, and
similar Pieces of Work where a Number of Projecting Pieces
Require to be Bored in a Right Line.
I. PATRICK ROBERTSON of Viewfield, Johnstone in the County of Renfrew
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:-
My said. Invention relates to a machine for boring the gudgeon holes in rudders
and stern posts of vessels, and in similar pieces of work where a number of projecting
pieces require to be bored in a right line.
When work of this description is bored in the usual manner from one end it
requires to be done with a boring bar as long as the piece of work, which is often
considerable; and the great length and consequent want of rigidity in the boring bar
renders the operation tedious and inaccurate. This is also the case if the work is
bored by a spindle carried on an upright small enough to go between the projecting
pieces, as the work then requires to be shifted and set up truly on the completion of
every hole.
My said Invention has for its object the boring of the work quickly and accurately
with one setting only, and in order that it may be the better understood I will proceed
to explain the same with reference to the accompanying sheet of drawings, in which
Fig. 1 represents a ground plan of the machine with a rudder in position for
boring.
Fig. 2. an end elevation of the machine.
Fig. 3. an end elevation with the spindle frame radiated to pass over a projecting
which hae baan haund

page_text: In these several views
A represents the bed with true guides for a traversing saddle which carries the
radial frame and boring spindle.
B. the traversing saddle.
C. a radial frame pivoted at centre J, and capable of being radiated between guides,
returning always to the same position, where it can be clamped.
+
D, the boring-spindle carried on the radial frame.
E. a handle for adjusting the radial frame.
Fa clamp for fixing the radial frame.
G. a train of spur gearing carried within, the radial frame and employed to drive
the horing-spindle from the main driving shaft.
H. the main driving shaft.
J. the centre for the radial frame.
K. the projection or
::
snugs" on a rudder which is shown in position for boring
the holes in which the pintles are fixed.
L. the screw for traversing the saddle.
The manner in which the operation is performed is as follows :—
"snug
snug" and
Having fixed down the piece of work and set the machine in motion, the outermost
projecting piece or "
is first bored. By depressing the handle E the radial
frame is now moved till it is swung clear of the projection; by means of the traverse
screw, the saddle is then advanced towards the next projecting piece or "
the frame with its spindle again radiated into position for boring, and so in succession
till all the projecting pieces or snugs are bored. The radial frame being accurately
fitted and guided returns always to the same position, where it can be fixed by the
clamp F, and so ensure that all the holes are in exact alignment.
It is obvious that, while in operation, the saddle may receive a self-acting feed
motion from the traverse screw by means of a ratchet or any other approved motion
usual in boring machines.
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,
The employinent of a boring spindle carried on a radial frame in combination with
a traversing saddle, substantially as.and for the purpose hereinbefore described, and
illustrated on the accompanying sheet of drawings.