Improvements in Toothed Gearing.
Year: 1892

page_text: Date of Application, 14th Nov., 1892
Complete Specification Left, 12th Aug., 1893-Accepted, 16th Sept., 1893
PROVISIONAL SPECIFICATION.
Improvements in Toothed Gearing.
THOMAS HUMPAGE, 12 Greenway Bush Lane, Ashton Gate, Bristol, Engineer,
and HERBERT INNIS JACQUES 24 Durdham Park, Bristol, Engineer, do hereby
declare the nature of this invention to be as follows:-
Letters Patent No. 15,289 of Novr. 9th 1887, having been granted to Thomas
Humpage of 12 Greenway Bush Lane, Ashton Gate, Bristol Engineer for
"An Improved Gearing for Lathe Headstocks, Drilling Machines and other
suitable Machinery"; this invention relates to improvements and developements of
the above, and consists in making the ring of metal K (provided with teeth which
does not revolve) shown in Figures 1, 2, 3, 4 & 5 of Complete Specification; into
a plate wheel (hereafter called the fulcrum wheel) with similar teeth, provided with
a boss; which wheel is free to revolve on a suitable bearing. The outer circum-
ference of this fulcrum wheel is provided with a number of slots, and the cam
shaped end of a lever fits into any one of same. When the gearing is in operation
the fulcrum wheel is prevented from rotating by the lever engaging with one of
these slots, but when the gearing is not required, the end of the lever is withdrawn,
and the fulcrum wheel and gearing rotate as a whole without exchanging teeth.
We sometimes form the outside of the fulcrum wheel into a worm wheel, gearing
with a worm running in bearings, and driven by a train of wheels, belt, chain or
other suitable means. When the worm is not rotated, the fulcrum wheel is
prevented from turning, but on driving the worm in either direction a different
ratio of the gearing is obtained. A similar result can be obtained by using a pinion
in place of the worm, and providing suitable teeth to gear with same in the
circumference of the fulcrum wheel.
We sometimes, as in the case of cranes, crabs, reduction gears for electric
motors &c. form the outside of the fulcrum wheel into a brake drum, and control
When the
the movement of same by a band brake, or by other suitable means.
brake is tightened, the fulcrum wheel remains stationary and the gearing comes
into operation, but on slacking same, the fulcrum wheel is free to rotate, and no
power is transmitted through the gearing.
In the case of electric motor reduction gear, this enables the work to be stopped
without stopping the motor. For cranes and crabs the band brake is also used for
controlling the lowering out of the load.
Dated this 12th day of November 1892.
THOMAS HUMPAGE,
HERBERT INNIS JACQUES.
COMPLETE SPECIFICATION.
Improvements in Toothed Gearing.
THOMAS HUMPAGE, 12 Greenway Bush Lane, Ashton Gate Bristol, Engineer
and HERBERT INNIS JACQUES, 24 Durdham Park Bristol, 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:-.
Letters Patent No. 15289 of Novr. 9th 1887 having been granted to Thomas
Humpage of 12 Greenway Bush Lane, Ashton Gate, Bristol Engineer, for "An
Improved Gearing for Lathe Headstocks, Drilling Machines and other suitable
Machinery"; this invention relates to improvements and developements of the

page_text: above and consists in making the ring of metal K (provided with teeth which does
not revolve) described in the Specification and shown in drawings Nos. 1, 2, 3, 4
and 5 of the before mentioned Patent, into a plate wheel (hereinafter called the
fulcrum wheel) with similar teeth and provided with a boss; which wheel is free
to revolve on a suitable bearing, and the movement of which is controlled by the
several means hereinafter described.
Referring to Sheet 1. Fig. 1 shows a half-sectional elevation, and Fig. 2 an end
view of a lathe headstock. The fulcrum wheel (K) is provided with a boss (A')
and is free to revolve on the bush (B'). The outer circumference of this wheel is
provided with slots (C¹), and the cam shaped end of a spindle (D'), which passes
through the headstock casting and is operated by the handle (E'), engages with
any of them, thus preventing the fulcrum wheel from rotating. In ordinary
working the cam is engaged in one of the slots (C¹) and the wheel (K) is the
fulcrum round which the motion of the gearing takes place. To stop the lathe
mandrel from rotating, the handle (E¹) is turned half round thus disengaging the
cam from the slot (C) and the wheel (K) is free to revolve on the bush (B') and
no power is transmitted.
We sometimes drill holes round the fulcrum wheel (K) and provide a pin which
passes through the end of the headstock casting, and engages in one of the holes.
The action is the same as that of the cam lever and slots previously described.
We sometimes form the outer circumference of the fulcrum wheel (K) into a
worn wheel, and fix a worm in suitable bearings, gearing with same.
When the
worm is stationary the fulcrum wheel (K) is under the same conditions as when
held by the cam shaped lever previously described, but if the worm is rotated in
either direction by a train of wheels or other suitable means, a variable ratio of
speed is imparted to the gearing. We also obtain a similar result by forming the
outer circumference of the wheel (K) into an ordinary spur wheel, and using a
pinion in place of the worm previously described.
We sometimes (Fig. 3 & 4) form the fulcrum wheel (K) into a brake drum and
control its movement by a band brake or other suitable means. When the brake
is tightened the fulcrum wheel remains stationary, but on slacking same, it is free
to rotate and no power is transmitted.
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 combination of a movable fulcrum wheel with the gearing set forth &
described in Letters Patent No. 15289 of Novr. 9th 1887; the motion of which is
controlled by the several means set forth and described in this Specification and
shown in Figs. 1 to 4.
Dated this 11th day of August 1893.
THOMAS HUMPAGE.
HERBERT INNIS JACQUES.