IMPROVEMENTS IN DYNAMO AND MAGNETO ELECTRIC MACHINERY
Year: 1882

page_text: LETTERS PATENT to Joseph Samuel Beeman of Earls Court Road in the
County of Middlesex for an Invention of IMPROVEMENTS IN DYNAMO AND
MAGNETO ELECTRIC MACHINERY.
PROVISIONAL SPECIFICATION left by the said Joseph Samuel Beeman at¸
the Office of the Commissioners of Patents on the 20th July 1882.
JOSEPH SAMUEL BEEMAN of Earl's Court Road in the County of Middlesex
IMPROVEMENTS IN DYNAMO AND MAGNETO ELECTRIC MACHINERY
The improvements consist in automatically removing from the armature certain
portions of the circuit and automatically replacing them by insulated stops or
contact pieces, fitted for portions of their length and width, with metallic rubbing
surfaces, so that said surfaces connect and complete the circuit or circuits. The
invention is performed by dividing the armature coil or coils into any desired
number of bobbins, the end of one and the beginning of the next being placed in
electrical contact by means of springs, or other convenient means for impinging-
and the portions of the armature desired are removed by the action of the springs
which break and make contact, as the armature rotates, with the interposed
rubbing, surfaces

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Joseph Samuel Beeman in the Great Seal Patent Office on the
20th January 1883.
JOSEPH SAMUEL BEEMAN; of Earls Court Road, in the County of Middlesex,
IMPROVEMENTS IN DYNAMO AND MAGNETO-ELECTRIC MACHINERY
The improvements relate to machinery for removing from the armature of a
continuous current dynamo or magneto-electric machine, certain sections of the
circuit or circuits, when they cease to be active in producing current, and replacing
these sections into the circuit or circuits as they arrive at the active points in the
magnetic field, by means of insulated stops or contact pieces, fitted with metallic
rubbing surfaces at portions of their length or width, so that said surfaces connect
and complete the circuit or circuits through the active portion or portions of the
armature and so saving power by cutting out the inactive portions of the
armature. The invention is performed by dividing, when necessary, the metallic
conductor composing the armature, into any convenient number of sections; the
last end of one section and the first end of the next section or any convenient
arrangement of series or groups of sections being brought into electrical contact by
means of springs or equivalents for impinging; and these armature sections which
are not active in producing current are removed from the circuit or circuits by the
action of the springs which make and break contact with the interposed rubbing
surfaces when the armature is rotated.
The accompanying drawing will serve to illustrate the mode of performing the
invention. Fig 1 is an elevation of an armature, and Fig 2 is a plan view of a
commutator (unfolded) constructed according to my invention, and shown in end
elevation at Fig 3 and plan at Fig. Figs. 5 and 6 are plan views of modifications
of a commutator (unfolded), and, Fig 7 is a longitudinal section of Fig 6. Fig 8
is an armature in which the opposite sections of metallic conductor are connected
in series, and Figs. 9 and 10 are unfolded views of commutator adapted to Fig 8.
A is an armature ring. Y is an insulated carrier for the springs or rubbing
surfaces b. c. d. e. f. g. h. i. 8. r. q. p. o. n. m. and l-K and K¹ are the insulators
upon which the interposed insulating stops or contact pieces with their connections
M, L, N, P, are mounted. B, C, D, E, F, G, H, and I, are sections of metallic conductors
on the armature, the first and last ends being connected with their corresponding
letters of reference on the commutator, or the modifications thereof as shown-
K and K Figs. 3 and 4 are mounted on the adjusting bars X X.- The armature A
and commutator when rotated in the direction of the arrows as shown, will
cause K to remain fixed being held by X X¹, and the springs b. c. d. &. and m.
n. o. &., as in Fig 2, successively make and break contact with the circuit at L
and M and at N and P. In Figs. 5, 6 and 7 the revolving springs are replaced by
revolving rubbing surfaces; and the fixed rubbing surfaces shown in Fig 2 are
replaced by fixed scratch brush or other springs as shown
When I connect the opposite sections of the metallic conductors in the armature
in series as in Fig 8 the first and last ends of these series being connected with
their corresponding letters of reference in the commutator or modification thereof,
as shown in Figs. 9 or 10 for instance, the springs or their equivalents make and
break contact with the circuit at L and M only, and I only have half the number
of revolving springs or their equivalents and N and P are consequently dispensed
with.

page_text: I claim. In a continuous current dynamo or magneto-electric machine, the
commutator formed by the insulated metallic springs and their insulated metallic
rubbing surfaces, or modifications thereof, substantially as illustrated and described,
and for the purposes set forth.
In witness whereof I the said Joseph Samuel Beeman, have hereunto set my
hand and seal this 15th day of January A.D. 1883.