An Improved Tool for Countersinking Ship Plates, Applicable also to other Boring and Countersinking Operations.
Year: 1889

page_text: Date of Application, 4th May, 1889-Accepted, 22nd June, 1889
COMPLETE SPECIFICATION.
An Improved Tool for Countersinking Ship Plates, Applicable also
to other Boring and Countersinking Operations.
We FREDERIC JOHN STEPHEN of the Lanthouse Shipyard, Glasgow, in the
County of Lanark, Shipbuilder, and CLAUDE CARTER: of Thurso Villa, Albert Road,
Levenshulme, Manchester, in the County of Lancaster, 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 and
accompanying drawings
-
Our said Invention relates to an improved method of mounting and operating a
countersinking or boring tool or spindle which is used to act upon heavy plates or
masses of metal which are difficult to shift and manipulate on account of their weight.
Hitherto such a countersinking or boring tool has been a fixture with regard to position
so that it has been necessary to move the plate or other object so as to bring the hole
or mark directly under the drill or countersinking tool. In the case of large and heavy
plates and other objects this entails great expenditure of labour and time. By means
of our invention we mount the boring or countersinking tool spindle in such a
manner that it can be quickly and easily shifted in every direction so that there is no
need to change the position of the plate or mass being operated upon
To render our Invention perfectly clear we will now proceed to describe it with the
assistance of the annexed sheet of drawings.
Fig 1 is a side elevation showing the improved arrangement of tool. Fig 2 is a
plan view Fig. 3 is a diagram to a reduced scale showing the movements of which
the tool is capable
The spindle a is formed at the foot to receive a countersinking or boring tool band
is supported in bearings c. d in the bracket e. This bracket e is provided with four
wheels f.ff.f which run upon the top of a double girder 9 g while additional
wheels carried by the bracket and bearing upon the underside of the girder a g
give additional steadiness and security to the carriage thus formed. The bracket or
carriage e is thus capable of being traversed backwards and forwards upon the
girder gg. This girder g. 9 is not a fixture but is practically a swing jib pivotted
at the point to the bracket which is secured by bolts to the wall or columns of the
shed. To support the outer overhanging end of the girder or jib we carry a tie bar
or stay from the said outer end to another bracket k also secured by bolts to the
wall or columns of the shed A sleeve extending downward from the superimposed
bracket and passing through the eyes of the bracket k forms a pivot upon which the
head m of the stay is centered. The outer end of the stay being firmly secured to
the outer end of the girder the whole forms a swing jb capable of being turned upon
its pivots. Referring again to the drill headstock or carriage e, it will be observed
that the said headstock carries a bevel spur wheel n and also a bevel pinion wheel o
both wheels having sleeves which are carried in bearings dp in the headstock e and
which remain constantly in gear with each other. The spindle a passes through the
spur bevel wheel n and by means of a slip feather and groove or other suitable device
will always partake of the rotatory motion of the wheel n while at the same time it
can be moved up and down in the direction of its length by means of the lever r
which is pivotted at s to links t which are dependent from the headstock e The fork
of the 'lever embraces a loose sleeve which runs between collars which are fixed
to the spindle a The lever and spindle a are kept in a fixed normal position say in
the position shown in the drawing by a coiled spring but a weight or other suitable
means may be used to effect this object. A revolving shaft to runs parallel with the
jib g. g and passes through the sleeve or boss of the bevel pinion o. By means of a
ship feather and groove or other suitable device the bevel pinion o revolves with the

page_text: shaft w but is at the same time capable of being traversed along the said shaft when
the headstock is moved The shaft to is driven by gearing from the vertical shaft x
as clearly shown in the drawing, the said vertical shaft receiving its motion by
means of the gearing y from the line or pulley shaft z The plate or other object to
be bored or countersunk which is indicated by q in Fig. 3 is laid on a suitable
support beneath the tool and within the sweep of the jib as indicated by the dotted
lines in Fig. 3. The spindle a is depressed by the operator through the lever
and any part of the plate or object can be reached by simply moving the headstock
to and fro on the jib and by turning the jib on its pivots both of which movements
can be effected by the workman grasping the lever so as to bring the drill or
countersinking tool over any part of the plate By these means we obviate the
necessity for moving the plate or other heavy mass about, during the countersinking
or boring operation as the drill or tool can with very slight exertion be brought
over any part of the plate or other object.
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
(1) The general arrangement and combination of parts comprising the improved
swing jib countersinking or boring tool substantially as described and shown.
(2) In apparatus for countersinking or boring ship plates and other plates and
objects mounting the headstock carrying the drill or countersink spindle upon
wheels or rollers fitted to traverse upon a pivotted swing jib so that by the combined
motions of the jib and the headstock the dull or countersink can be brought over
any part of a plate or object within the sweep of the jib, substantially as described
and shown.
(3) In apparatus for the indicated purposes the swing jib in combination with
the traversing headstock and the means for imparting rotatory motion to the spindle
and drilling or countersinking tool and for lowering and raising the said spindle,
substantially as described and shown.
Dated this 3rd day of May 1889
DUTTON & FULTON,
1, St. James Square, Manchester, Agents.