AN ELECTRIC HAND TOOL FOR THE USE of ManufactuRING JEWELLERS, ENGRAVERS, AND OTHERS, FOR CHASING, DRILLING, WORKING AND POLISHING METALS AND HARD SUBSTANCES, AND FOR PRODUCING FROSTED AND ORNAMENTAL SURFACES
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by Thomas Henry Seymour Hawker
and Joseph Wolf Salaman at the Office of the Commissioners of Patents
on the 15th June 1883.
THOMAS HENRY SEYMOUR HAWKER [of Moseley in the County of Worcester
Electrician] and JOSEPH WOLF SALAMAN [of Edgbaston Birmingham in the County
of Warwick Manufacturing Jeweller] " AN ELECTRIC HAND TOOL FOR THE USE
of ManufactuRING JEWELLERS, ENGRAVERS, AND OTHERS, FOR CHASING, DRILLING,
WORKING AND POLISHING METALS AND HARD SUBSTANCES, AND FOR PRODUCING
FROSTED AND ORNAMENTAL SURFACES
"
Our Invention consists of a hand tool or apparatus containing or forming an
electric motor which is put into operation by a battery or other suitable generator
placed at a convenient distance from the Operator and connected by insulated
wires to the said electro motor-From this apparatus a tool or tools project
varying with the nature of the work to be performed and interchangeably attached
to a rod or bar, or to rods or bars to which a crank or excentric on the rotating
spindle of the electro motor imparts a reciprocating motion, or a rotary as well as a
reciprocating motion may be imparted or a simple rotary motion may be obtained
by attaching a tool or tools to the rotating spindle of the electro motor. When we
employ a reciprocating rod we construct it in two pieces which we connect by a
spiral spring which is thus interposed between the tool-holder and that portion of
the rod to which the reciprocating motion is directly imparted, by this means we
provide against the stoppage of the motor upon the tool being subjected to undue
pressure.
It is obvious that various forms of electro motors may be employed but we
prefer to embody in the construction of our apparatus the following arrangement
of electro motor as being particularly suitable
Our electro motor consists of an iron armature in the form of a disc mounted on
a spindle and carrying on one or both surfaces a series of iron cores in a crown
around the margin and having their axes parallel to that of the said spindle-The
cores carry small reels of wire wound alternately in opposite directions and
connected to a common polechanger or commutator so as to change the polarity
induced in the cores by any current of electricity entering at the spring contacts at
intervals suitable for obtaining continuous motion with a bipolar or multipolar
Din 0.11

page_text: field In the case of a multipolar field the inductors consist of a similar crown of
coils fixed opposite and concentric with the armature with the core ends facing
each other The commutator is constructed with segments double in number to
the armature and field coils so as to reverse armature polarity each time the
neutral position is attained, on the well known general principle of electro
motors.
Our electric tool or apparatus is either provided with a handle or is so
constructed as to be conveniently held in the hand of the operator who directs
the tool or tools upon the work to be treated, and by its use a variety of operations
can be performed, and various ornamental surfaces can be produced with very
advantageous-expedition-as-compared with hand labour.