Year: 1887

page_text: Date of Application, 9th Sept., 1887
Complete Specification Left, 7th July, 1888
Complete Specification Accepted, 10th Aug., 1888
I THOMAS LYNCH HEMMING, of 165 George Street, West, Hockley, Birmingham
in the County of Warwick, Electro-Plater and Electrical Engineer do hereby declare
the nature of this invention to be as follows:-
My invention relates to improvements in the kind of Dynamo-Electric-Machines
known as the Siemens Harmature.
It consists of improvements in the said armature, the chief objects of which improve-
ments are to obtain more power without increasing the size of the armature.
The said armature is built up as hereinafter described and illustrated by the
accompanying drawings.
First, for the purpose of forming a solid basis to work upon, I prepare two H shaped
blocks as shewn at fig. 1 of gun-metal, bronze, or soft iron, slotted or grooved as
shewn for the core, after which I place two or more bolts (the number depending
upon which pattern disc I use) upon one of the blocks upon which I thread the discs
placing a sheet of mica, asbestos, or varnished paper between each disc for the purpose
of preventing the said discs from getting hot, when the whole of the discs are threaded.
I fix the other H shaped block at the other end of the armature and screw the whole
firmly up together after which the coil is wound sufficiently to fill up the slots at top
and bottom also at the ends of the armature.
The discs may be of three shapes as indicated in the drawings Nos. 2. 3 & 4 when
No. 2 is used I also use a washer to make up the thickness in order that they may lie
flat together.
At each end of the armature after the coil is wound I place another disc of gun
metal or bronze for the purpose of containing the spindle, this disc covers the end of
the coil and is firmly screwed to the H shaped blocks; this disc also forms a basis
upon which I fix a longitudinal casing running along the top and bottom of the
armature and being secured at each end to the said disc by a dovetail or other suitable
fastening

page_text: The said casing is made of hard rubber vulcanized fibre, or wood, and on the outside
is made segmental so as to complete the circle of the armature and forms a protector
against the coils flying out in their rapid revolution, it also renders the outside of
the armature a complete and regular circle, thus decreasing the air friction as it
revolves.
The poles of the field magnet are formed of bars of soft iron of a suitable shape to
envelop and embrace the armature.
The advantages of my invention are as follows,
By my method of building up the armature, I am enabled to dispense with the central
hole and spindle running through the core of the arinature, thereby obtaining a
greater mass of iron in the core of the armature, also increased space for the
conductor.
By placing the H shaped block at each end, I obtain a more solid formation or
basis upon which to screw the discs, also by placing the discs on two rods, I am
enabled to screw them much firmer than when placed on a central spindle, also by
placing a sheet of mica, asbestos or varnished paper between each disc instead of a
washer, I obtain a greater mass of iron, together with less liability of over heating.
By placing the spindle on an end disc, with a covering or protector attached thereto
I render it more compact and less liable to wear by friction.
Dated this 7th day of Santambar 1007

page_text: Improvements in Dynamo Electric machines.
I THOMAS LYNCH HEMMING of 165 George Street West Hockley Birmingham in
the County of Warwick, Electroplater and Electrical 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 :-
My invention relates to improvements in the kind of Dynamo Electric machines
known as the Siemens H Armature.
It consists of improvements in the said armature, the chief objects of which improve-
ments are to obtain more power without increasing the size of the armature.
I will now proceed to describe with reference to the accompanying drawings the
manner in which my invention is constructed and used.
Figure 1 represents one of the H shaped blocks provided with two bolts or con-
necting rods.
Figures 2, 3 and 4 represents discs of different shapes.
Figure 5 represents a sectional elevation of my improved armature.
Figures 6 and 7 represent detailed views of the H shaped blocks.
Figure 8 represents a plan of the spindle disc.
Figures 9 and 10 represent the longitudinal casing.
Figure 11 represents a front elevation of longitudinal casing built in segments.
Figure 12 represents an end view of figure 11.
In carrying out my invention I provide two H shaped blocks as shown at figures 1,
6 and 7 these H shaped blocks form a solid basis on which the complete armature is
built. The block a is pierced with two holes to receive the connecting rods b b₁ the
block a is also pierced with two countersunk holes c c¹.
I next thread the connecting rods 66 in the manner indicated, securing them in
position by means of the nuts d d, I then build up the core by threading a disc
similar to figure 3 over the connecting rods, the disc so threaded is shown at e, tho
mica disc is marked on figure 5. I continue to thread the discs and mica sheets
alternately until I reach the last disc g. I then provide the nuts h h' and thread them
over the ends of the connecting rods and thus tighten the discs and mica into one
compact rigid mass, the discs would thus be connected to the H shaped block a.
next take a second H shaped block which is provided with countersunk holes on
both sides, the countersunk holes k k' are passed over the nuts h³, the nuts are
next screwed on to the connecting rods in the manner illustrated thereby completing
the connection of H shaped ends and discs. I next wind a coil from end to end
illing up the slots of the H shaped ends.
I
I next provide a spindle bearing disc n and screw therein the spindle m, the spindle
pearing disc is secured to the H shaped piece a, by means of four set pins passing
hrough the holes o, o¹, 02, 0%, provided in the face of the spindle bearing disc as
represented at figure 8, the set pins are screwed into the holes p, p, p², p³ provided in

page_text: the H piece, to save complication, the holes are not shown on figure 5, I do not
confine myself to four holes and four pins, as I may fasten the spindle disc to the
Hshaped block by any other suitable equivalent mechanical means.
I next provide a longitudinal casing, this casing may be made of hard rubber,
vulcanized fibre or other equivalent, and in some cases it may be made out of a
number of plates built upon connecting rods and insulated with mica or other
equivalent, in the manner represented at figures 11 and 12. The casing formed
either in the manner represented at figures 9 and 10 or in the manner represented at
figures 11 and 12 would be provided with dovetail tenons q q¹; I take two of these
casings and place them to rest over the wires, the dovetail end being passed through the
dovetail slots and s provided to receive them.
I next provide a second spindle-disc n¹ and a second spindle m³, I place the spindle
disc n² in the position represented at figure 5 passing the dovetail slots over the dove-
tail ends of the casing I then secure the said spindle n¹ to the H shaped end j by
means of set pins or other equivalents in the manner hereinbefore referred to in
reference to the H shaped piece a.
When utilizing the shape of disc represented at figure 2 I provide a central con-
necting rod in addition to the rods 66 on this central rod would be threaded on
washer t figure 2 with each pair of discs.
Instead of providing the dovetail slots rands and the dovetail tenons q q¹ I
may as an equivalent means of securing the casing, form the discs, figures 3 and 4 in
a dovetail shape as indicated by the dotted lines.
By my method of building up the armature and by thus dispensing with the spindle
I utilize the space usually occupied by the said spindle for obtaining a greater mass
of material in the core of the armature.
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 at what I
claim is :
1st. The invention as illustrated and described for the purpose described.
2nd. The combination of the H shaped blocks with the connecting rods, discs, mica
plates, spindle-discs and coil, in conjunction with the casing in the manner illustrated
and described for the purpose described.