Improvements in or connected with Dynamos.
Year: 1894

page_text: Date of Application, 2nd Feb., 1894
Complete Specification Left, 20th Sept., 1894-Accepted. 27th Oct., 1894
PROVISIONAL SPECIFICATION.
Improvements in or connected with Dynamos.
We, WILLIAM EDWARD YATES, of Aire Street, Leeds and Wellington Mills,
Bramley near Leeds, Woollen Manufacturer and ALFRED CLEGG of Wellington
Mills, Bramley near Leeds, both in the County of York, do hereby declare the
nature of this invention to be as follows:-
The object of our invention is to prevent grooving on the commutators of
dynamos, which has hitherto been caused by the action of the brushes on the
surface of such commutators and by the employment of apparatus constructel
according to our invention the necessity of continually smoothing the said surface
is obviated.
According to our invention we mount the brushes in a frame, which is made to
slide longitudinally in bearings on the rocking frame. A rod, which is mounted in
suitable bearings, is adjustably attached to the back of the sliding frame, the centre
of the said rod being in a line with the axis of the dynamo. This rod is made to
reciprocate slowly, by means of a slot crank motion in conjunction with worm
and worm wheel gearing, or it may be reciprocated by any other suitable means.
By the turning of the worm, the worm wheel is rotated, thereby reciprocating the
rod through its slot crank motion, causing the sliding frame carrying the brushes to
travel slowly backwards and forwards on the surface of the commutator, thus
equalizing the wear, and preventing the formation of grooves.
The sliding frame, being mounted on the rocking frame and on the rod which is
in a line with the axis of the dynamo, enables the brushes to be adjusted in
the ordinary way, according to the amount of current required.
It will be readily understood that by the employment of apparatus constructed
according to our invention, sparking is obviated, and the wear and tear of the
commutator is considerably diminished.
13
1004
BREWER & SON,
London and Leeds, Agents for Applicants.
COMPLETE SPECIFICATION.
Improvements in or connected with Dynamos.
We, WILLIAM EDWARD YATES, of Aire Street, Leeds, and Wellington Mills
Bramley, near Leeds, Woollen Manufacturer and ALFRED CLEGG, of Wellington
Mills, Bramley, near Leeds, Engineer, both in the County of York, 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:-
The object of our invention is to prevent the formation of grooves on the surface
of the commutator, which grooves have hitherto been caused by the action of the
stationary brushes on the surface thereof; and by the employment of apparatus
constructed according to our invention, the necessity of smoothing the said surface
is entirely obviated.
In order that our invention may be clearly understood, we will proceed to
describe same with reference to the accompanying drawings, in which similar
letters refer to like parts in all the figures.

page_text: Figure 1 is a side elevation showing a portion of a dynamo with our invention
applied thereto, Figure 2 is an end elevation of same;
Figures 3 and 4 are detail views.
According to our invention we mount the brushes A A A and A¹ A¹ A¹ on
frames B and B₁, which frames are made to move longitudinally on projecting
slides C, and C', which are formed on the rocking frame D.
Connecting rods E and E' connect the frames B and B with a cross arm F,
the latter being mounted on a rod G which is free to slide in a bearing H, situated
on a frame J attached to the main frame of the dynamo.
On the end of the dynamo shaft we mount a pulley K which transfers motion, by
means of a cord, to a pulley L which is mounted on a shaft M carried in
bearings N N of the frame J. The opposite end of the shaft M carries a pinion P,
which gears with a toothed wheel R, thereby transferring motion to a worm S.
The rotation of the worm S transfers motion to the worm wheel T, which through
the medium of the slotted crank motion V communicates the required reciprocating
movement to the rod G above referred to.
The reciprocating movement of the rod G is transmitted through the cross arm F
and connecting rods E and E' to the brush frames B and B', thereby causing the
brushes A A A and A' A' A' to reciprocate slowly on the surface of the
commutator.
The brush frames B, and B', moving on the slides C and C of the rocking
frame D, being mounted in connection with the sliding rod G which is in a line
with the axis of the dynamo, enables the brushes A A A and A' A' A' to
be adjusted in the ordinary way, according to the amount of current required.
By the employment of apparatus as above described, the wear on the surface of
the commutator is equalized, thus effectually preventing the formation of grooves,
which have hitherto been caused by the action of stationary brushes. The saving
thus effected is very great, as the necessity of turning down the commutator to
obtain a smooth surface and to prevent sparking, is entirely obviated, and thus the
life of the commutator is considerably extended.
It will be readily understood that any reducing gear may be employed for
transmitting motion from the shaft of the dynamo to the rod G, but we have found
in practice that the means herein described answer the purpose well.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim as our improvements in or connected with dynamos, is :-
1. The brushes of dynamos mounted on frames sliding longitudinally on the
rocking frame, substantially as and for the purposes set forth.
2. The combination of the brushes A A A and A' A' A', frames B and B',
slides C and C¹, rocking frame D, rods E and E¹, cross arm F, and rod G,
substantially as and for the purposes set forth.
3. The parts described in Claim 2, in combination with the slotted crank
motion V, worm wheel T, worm S, toothed wheel R, pinion P, shaft M pulley L
and pulley K, substantially as and for the purposes set forth.
4. The combination of the pulley K, pulley L, pinion P, toothed wheel R and
worm S for actuating apparatus for giving reciprocating motion to the brushes of
dynamos, substantially as and for the purposes set forth.
5. The general arrangement, construction, and combination of the various parts
forming the means or apparatus for reciprocating the brushes of dynamos,
substantially as and for the purposes set forth.
Dated this 20th day of September 1894.
BREWER & SON,
London and Leeds, Agents for Applicants.