Improvements in Carbon Brushes, Blocks, or Collectors for Electric Generators and Motors.
Year: 1893

page_text: Date of Application. 3rd Nov., 1893
Complete Specification Left, 1st Sept., 1894-Accepted, 6th Oct., 1894
PROVISIONAL SPECIFICATION.
Improvements in Carbon Brushes, Blocks, or Collectors for Electric
Generators and Motors.
I, WILLIAM HARDING SCOTT Electrical Engineer Gothic Works, Norwich,
do hereby declare the nature of this invention to be as follows:-
According to this invention I make each carbon brush or collector of a small
rectangular or round block of carbon with a hole through its centre. This carbon
block I fasten on to a light rod tube or wire which is connected to the brush holder
by means of springs or the like in such a way that it can be made to press the
carbon block on to the commutator.
I fix the carbon block between two collars in a suitable position on the rod tube
or wire. One of these collars I make removable so that the carbon block can easily
be replaced. These collars besides holding the carbon block in position, help to
take the current from the carbon block to the conductors provided for this
purpose.
By fastening each carbon block by means of a hole through its centre instead of
as is usual by a sheath outside, I make the whole collector very much lighter
besides which I can get more carbon collecting surface on the commutator. Instead
of making a hole through the centre of the carbon I may make a slot along which
the aforesaid rod, tube or wire can pass and I may arrange this rod tube or wire
with an additional feather or extra wire fastened above or below it so that it will
come in the slot and prevent the carbon block from turning round, the carbon
block being prevented from moving along the rod tube or wire by means of small
washers or nuts.
Dated this 2nd day of November 1803
COMPLETE SPECIFICATION.
Improvements in Carbon Brushes, Blocks, or Collectors for Electric
Generators and Motors.
I, WILLIAM HARDING SCOTT of Gothic Works, King Street, Norwich, in the.
County of Norfolk, Electrical Engineer, do hereby declare the nature of my.
invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement :-
According to this invention I make each carbon brush block or collector of
carbon (which may be small and rectangular or round or of other suitable shape) with
a hole through it say at the centre of its length or thereabouts and 1 fasten the said
block onto a rod tube or wire which is connected to the brush holder in such a way
that by means of springs or the like the said carbon block is pressed onto the
commutator.
I fix the said carbon block between two collars in a suitable position on the rod
tube or wire. One of these collars should be made removable so that the carbon
block can be readily removed fr. m the said rod tube or wire and replaced. These
collars besides holding the carbon block in position help to take the current there-
from to the conductors provided for this purpose.
By fastening each carbon block by means of a hole therethrough instead of, as is
usual by a sheath outside I can make the whole collector very much lighter besides

page_text: which a greater amount of carbon collecting surface bearing on the commutator is
obtainable. Instead of making a hole through the carbon block of the size of the
rod tube or wire I may make a slot through which the aforesaid rod tube or wire
is passed and by providing this rod tube or wire or one of the collars with a feather
or additional pin or wire fastened above or below it so that it will be situated in
the slot the carbon block will be prevented from turning round it being prevented
from moving along the rod tube or wire by any suitable means such as by nuts for
example or by the aforesaid washers sunk into corresponding recesses in the carbon
block.
The accompanying drawing represents what I consider the most convenient way
of carrying my invention into effect but I do not limit myself to the precise details
therein shewn.
The
Figures 1 and 2 are views at right angles to each other shewing so much of the
parts of a generator or motor as are necessary to illustrate the application of my
invention thereto. A represents the commutator and B the conductors for taking
the current from the carbon blocks brushes or collectors which are shewn at C.
Each carbon block brush or collector C has a hole through it and through this is
passed a rod D connected to the brush holder E by means of the screw and nut e.
The ends of the rods D are provided with hooks d for receiving an elastic band F
or other form of spring for pressing the blocks C onto the commutator.
blocks C are held in position on the rods D between a collar on each of the said
rods and a collar 9 on a tube G which is put in place after the carbon block C is
placed on the said rod D. The upper end of this tube G as a collar g² formed on
it as shewn, and the screws and nuts e serve as the means of binding the parts in
position. The collars (2 and g are shewn as being sunk into corresponding recesses
in the carbon blocks Ç. The said collars and recesses may be round or of any
suitable shape. If they be of square or equivalent shape they will prevent the
carbon block from turning. Figures 3 and 4 shew in side view and plan a carbon
block provided with a slot c as aforesaid the pin on the collar g entering the said
slot and securing the block in position both against moving lengthwise and against
turning.
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. A carbon brush, block or collector, 'having a hole, slot, or the like, passing
therethrough and supported by a support passing through the said hole slot or the
like, substantially as, and for the purposes herein before described.
2. Carbon brushes, blocks, or collectors constructed and supported, and connected
with the conductors substantially as hereinbefore described and illustrated by the
accompanying drawings.
Dated the 1st day of September 1894.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, W.C., Agents.