Improvements in Portable Drilling, Tapping, and Studding Apparatus.
Year: 1891

page_text: Date of Application, 8th May, 1891
Complete Specification Left, 8th Feb., 1892-Accepted, 12th Mar.,
1892
PROVISIONAL SPECIFICATION.
Improvements in Portable Drilling, Tapping, and Studding
Apparatus.
1, ANGUS MURRAY, of Strathroy, Dumbreck, in the County of Renfrew,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention has for its object to economise time and labour in the use of the
ordinary hand ratchet and similar hand drilling, tapping and studding apparatus, by
adapting motive power to operate and feed the drill or other tool and that without
materially adding to the weight of such apparatus.
In applying the invention to the ordinary form of hand ratchet drill, one or more
small motive power cylinders is or are fitted on an arm which may be fixed to the
stock the other end being held by the attendant or fixed to the work whilst the
reciprocating piston in the cylinder actuates the ratchet lever. The motive power
engine is actuated by an elastic fluid supplied through a flexible tube and
controlled by an automatic valve or by the attendant and may be fitted so as to be
adjustable to suit the work and permit of variation of the stroke and force required
to be exerted.
In another of the various modifications of which the invention is susceptible the
apparatus is made with a special stock and handle carrying a small direct acting
motor operating through gearing on the drill or other tool, the tool holder being
fitted for example with a worm wheel in gear with a worm on the crank shaft of
the motor which may be combined with the handle. The actuating fluid may be
admitted through the handle to the motor and to the feeding ram when such is
provided and the exhaust may be utilized to blow on and clear the point of the
tool.
In another arrangement a small rotary or other convenient form of motor may be
fitted on or connected to spindle and arranged to drive the drill or other tool direct.
In each case a ratchet and pawl may be provided for operating the apparatus by
hand when power is not available.
The drill or tool may be fed by a screw or like means as hitherto or as preferred
by the pressure of the motor fluid, acting on a ram or piston working in a cylinder
carrying the centre or spindle of the apparatus. Or the pressure ram may be
combined with the feeding screw so that either arrangement may be used for feeding
the drill.
Dato this Seventh day of May 1891
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in Portable Drilling, Tapping, and Studding
Apparatus.
I, ANGUS MURRAY of Strathroy, Dumbreck, 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 :-
This invention has for its object to economise time and labour in the use of
the ordinary hand ratchet and similar hand drilling, tapping and studding apparatus
by adapting motive power to operate and feed the drill or other tool and that
without materially adding to the weight of such apparatus.

page_text: In one of the various modifications of which the invention is susceptible and
which is represented in the accompanying drawings in sectional elevation at
Figure 1 in horizontal section at Figure 2 and in cross section at Figure 3 the
apparatus is made with a special stock A and handle B carrying a small direct
acting motor C operating through gearing on the drill or or other tool, the tool
holder A being fitted for example with a worm wheel D in gear with a worm D'
on the crank shaft E of the motor C which may be combined with or constitute
part of the handle.
The actuating fluid is or may be admitted through an orifice F in the
handle to the motor and the exhaust may be utilized to blow on and clear the
point of the tool.
The drill or tool may be fed by a screw or like means as hitherto or as is preferred
by the pressure of the motor fluid, acting on a ram or piston I working in a cylinder J
carrying the centre or spindle of the apparatus, the fluid being admitted by an inlet
pipe K. Or as shewn the pressure ram I may be combined with the feeding screw L
so that either arrangement may be used for feeding the drill.
In applying the invention to the ordinary form of hand ratchet drill, one or more
small motive power cylinders is or are fitted on an arm which may be fixed
to the stock the other end being held by the attendant or fixed to the
work whilst the reciprocating piston in the cylinder actuates the ratchet lever.
The motive power engine is actuated by an elastic fluid supplied through a flexible
tube and controlled by an automatic valve or by an attendant and may be fitted
so as to be adjustable to suit the work and permit of variation of the stroke and
force required to be excrted.
In another arrangement a small rotary or other convenient form of motor may
be fitted on or connected to the spindle and arranged to drive the drill or other
tool direct. In each case a ratchet and pawl may be provided for operating the
apparatus by hand when power is not available.
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 parts constituting the improved portable drilling, tapping
and studding apparatus described with reference to the annexed drawings.
2. The combination with portable hand drilling, tapping and studding apparatus
of a fluid pressure motor arranged to actuate the tool holder substantially as
described.
Dated this Sixth day of February 1892
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.