Improvements in Apparatus especially suitable for Grinding and Polishing the Commutators of Electrical Apparatus.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Apparatus especially suitable for Grinding and
Polishing the Commutators of Electrical Apparatus.
I, HENRY HAROLD PERRY, of 35, Castlebar Road, Ealing, in the County of
Middlesex, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to an apparatus whereby the commutators of dynamos,
transformers and motors and other parts of machines may be ground and polished
without removing them from the machine.
The apparatus consists of a bed plate carrying an emery wheel driven by an
electric motor or otherwise.
The bed plate has on its under side hooks fitting under the edge of one side of
the bed plate of the dynamo or other machine and lugs projecting beyond the other
side, the hooks and lugs being provided with clamping screws for firmly clamping
the two bed plates together. The bed plate of the apparatus is further steadied
by a standard or leg adjustable in height and resting on the ground.
In the case of dynamos and other machines having high pedestals the bed plate
of the apparatus is clamped to the pedestal whilst the standard or leg rests on the
bed plate of the machine.
The emery wheel is carried by a shaft free to turn in two bearings one mounted
on a slide rest and the other free to turn about a vertical pivot. The slide rest
traverses in a direction parallel to the shaft the latter moving with it and sliding
in the vertically pivotted bearing. The guides of the slide rest are also free to be
moved in a direcion at right angles to their length so as to adjust the cut--this
motion being possible by reason of the other bearing of the shaft being pivotted.
Dated this 16th day of October 1897.
Improvements in Apparatus especially suitable for Grinding and
Polishing the Commutators of Electrical Apparatus.
I, HENRY HAROLD PERRY, of 35, Castlebar Road, Ealing, in the County of
Middlesex, 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:-
This invention relates to an apparatus whereby the commutators of dynamos,

page_text: transformers and motors and other parts of machines may be ground and polished
without removing them from the machine.
Figure 1 is a side elevation and Figure 2 a plan of the apparatus. Figure 3 is
a plan to a smaller scale showing the apparatus in place on a dynamo, and
Figure 4 is a section of the dynamo on the line 4-4 Figure 3.
The apparatus consists of a bed plate a carrying an emery wheel b driven by an
electric motor or otherwise.
Figure 3 indicates three ways in which this may conveniently be done
namely by a belt e passing round a pulley d¹ fixed to the shaft d'and a split
pulley e which can be temporarily fixed to the shafte of the dynamo; or by a
belt c passing round a pulley d on the shaft d and a pulley e which can be
temporarily fixed to the end of the shaft e; or by a belt passing around the
pulley d and the pulley f' of an independent motor f.
The bed plate a has on its under side hooks a¹ fitting under the edge of one side
of the bed plate g of the dynamo or other machine and lugs a projecting beyond
the other side, the hooks and lugs being provided with clamping screws a³ for
firmly clamping the two bed plates together. The bed plate a of the apparatus is
further steadied by a standard or legh adjustable in height and resting on the
ground.
a
In the case of dynamos and other machines having high pedestals the bed plate.
of the apparatus is clamped to the pedestal ; whilst the standard or legh rests on
the bed plate g of the machine.
This arrangement is shown in end elevation, side elevation and plan respectively
at Figures 5, 6 and 7. In these figures the bed plate a is bolted by bolls to a
bracket consisting of a top plate a curved plate fitting against the side of the
pedestal a central web 12 connecting and , cheeks 3 embracing the sides of the
pedestal, fixed to the plate and connected to the web by webs 1. 15 are two
side rods fixed to the plate by bolts 16 and having their ends connected by a cross
bar fixed to them by bolts 18.
The bracket is clamped to the pedestal by screws m passing through the cheeks
and cross bar l.
As shown in Figures 1 and 2 the emery wheel b is carried by a shaft d free to
turn in two bearings n n¹ one n mounted on a slide rest o and the other n¹ free to
turn about a vertical pivot p. The slide rest o traverses in a direction parallel
to the shaft the latter moving with it and sliding in the vertically pivotted
bearing n. The guides o¹ of the slide rest are also free to be moved by the screw q
in a direction at right angles to their length so as to adjust the cut-this
motion being possible by reason of the other bearing of the shaft being pivotted.
The slide rest o has a rack of on its underside and is traversed by a pinion r
gearing with the rack and fixed to the shaft r¹. The latter has a second pinion
fixed to it gearing with the pinion s¹ fixed to the shaft s which is turned by the
handle s².
The bedplate a of the emery wheel can be fixed on either side of commutator,
the spindles of the rack and pinion gear protruding on either side of the bottom
slide rest for the purpose of reversal of the top when required.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is: -
1. The combination substantially as described of an emery wheel, a slide rest,
a portable bed plate and means for clamping the latter to the machine to be
operated on.
2. The combination substantially as described of an emery wheel, a slide seat,
a portable bed plate, a bearing carried by the slide rest and moveable transversely
to it, a second bearing carried by the bed plate and free to rotate in a plane parallel
to it, a shaft fixed to the emery wheel and working in the bearings, traversing with

page_text: the first bearing and free to move longitudinally in the second and means for
clamping the bed plate to the machine to be operated on.
3. Apparatus for grinding and polishing substantially as described and illus-
trated in Figures 1 to 3 of the drawings.
4. Apparatus for grinding and polishing substantially as described and illus-
trated in Figures 5 to 7 of the drawings.
Dated thin 01
1
+ T
1000