An Improved Worm Gear.
Year: 1895

page_text: Date of Application, 13th Feb., 1895
Complete Specification Left, 12th Dec., 1895-Accepted, 18th Jan., 1896
IVNAU
An Improved Worm Gear.
We ARTHUR ANDERSON WATKINS and JOHN DE LANNOY WATSON
Engineers of 16 White Lion Street Islington, London, do hereby declare the
nature of this invention to be as follows:-
This invention relates to worm gears used at high speeds and where the friction
caused by end thrust of the worm is considerable and has for its object the entire
obviation of this end thrust.
The gear consists of two worms on one spindle; one worm being a right hand
thread and one a left, driving two separate worm wheels.
The shafts or spindles onto which the worm wheels are fixed are coupled together,
either directly by spur wheels, crossed strap, or other suitable device; or the worm
wheels themselves are in gear with one another, the power being transmitted by
either or both spindles.
Or they are both so connected to the work to be driven that each worm transmits
an equal share of the work.
By any of these methods, one worm will pull or thrust against the other and the
worms transmitting equal power in opposite directions the thrust is entirely
obviated.
Dated this Twelfth daw Fa 1805
ARTHUR A. WATKINS.
J. DE L. WATSON.
We ARTHUR ANDERSON WATKINS Engineer, and JOHN DE LANNOY WATSON
Engineer of 16 White Lion Street Islington, London, 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 relates to worm gears used at high speeds, and where the friction
caused by end thrust of the worm is considerable, and has for its object the entire
obviation of this end thrust.
The gear consists of two worms, on one spindle (one worm being a right hand
thread and one a left) driving two separate worm wheels. The shafts or spindles
onto which the worm wheels are fixed are coupled together either directly by spur
wheels, crossed strap, or other suitable device. Or the worm wheels themselves are
gear with one another.
in
The power is transmitted by either or both spindles.
By any of these methods one worm will pull or thrust against the other, and the
worms transmitting equal power in opposite directions the thrust is entirely
obviated.
We will now more particularly describe our invention by reference to the
drawings.

page_text: A is the worm spindle with two worms B & C of equal diameter and pitch, one
being right hand and the other left, which two worms gear into two separate worm
wheels E & D both being of the same diameter and pitch each to the other.
Both worm wheels are firmly fixed on the shafts H & J and also firmly fixed on
these shafts are two spur wheels F & G which are both of equal diameter and pitch
and gear into one another.
It will thus be seen that the whole gear must travel round together and in
harmony and the worms do equal work, each doing half the work transmitted by
the gear and each thrusting in different directions thereby by the counteracting of
one another eliminating the thrust that would be otherwise given to the spindle.
Either shaft H or J can be prolonged beyond the bearings and used to transmit
the power required.
The two worn wheels can be in direct gear with one another as well as in gear
with the worms, and thus connect the shafts H & J and in this case no spur wheels
are required. Or the shafts can be connected by other means, it being only
essential that both shall travel round together.
Having now fully described our invention we claim,
The two worms right and left hand on one spindle, driving two worm wheels which
are coupled together in the manner substantially and for the purpose as herein
described.
L
Desemba 1905
ARTHUR ANDERSON WATKINS.
JOHN DE LANNOY WATSON.