Electromagnetic Ignition Device with Revolving Armature for Gas, Petroleum and similar Motor Engines.
Year: 1899

page_text: Date of Application, 6th Nov., 1899
Complete Specification Left, 8th Jan., 1900-Accepted, 15th Sept., 1900
PROVISIONAL SPECIFICATION.
[Communicated from abroad by FRIEDRICH STURM, of 78, Forststrasse, Stuttgart,
in the Kingdom of Wurtemberg, Germany, Mechanical and Electrical
Engineer.]
Electromagnetic Ignition Device with Revolving Armature for Gas,
Petroleum and similar Motor Engines.
I, WILLIAM PHILLIPS THOMPSON, FCS., MIME, of the Agency for Foreign
Patent Solicitors, 522, High Holborn, in the County of Middlesex, b, Lord Street,
Liverpool, and b, Bank Street, Manchester, both in the County of Lancaster,
and Lower Temple Street, Bumingham, in the County of Warwick, Civil
Engineer, do hereby declare the nature of this invention to be as follows
The electromagnetic devices hitherto known and constructed for the purpose
of igniting the explosive compound in gas engines and the like all suffer nom
the serious disadvantage that, with motors having a high rotatory velocity,
ignition frequently does not take place because the sparks are not sufficiently
powerful or tail aitogether The cause of such netheiency is that the recipio-
cating motion of the non core or body, used for producing the igniting spark,
and moving between the poles of a stationary held magnet and those of an,
also stationary aimature, cannot follow the revolutions or a motor, running at
high speed, with suthcient rapidity, there having two dead points to be overcome
at each full stroke of the said reciprocating on body The velocity of the
latter must therefore necessarily be of limited extent
The object of the present invention is to obviate the aforesaid disadvantage
by so constructing the apparatus that the armature is given a continuous iotatory
movement while the poles of the field or electro-magnets remain stationary,
Upon the spindle of the armature is mounted an eccentric cam, two-pointed
wiper wheel or the like by means of which the spark lever 18 twice brought
into contact with the spark 1od at each revolution of the armature spindle, any
convenient transmission gear being employed for the described purpose In this
manner there are produced sparks which never fail and are in all cases of
sufficient strength for igniting the explosive compound independent at the
10tatory velocity of the motor
To the core of the armature are suitably secured discs having trunnions by
means of which trunnions the armature is tuinably held in its bearings. The
face plates as well as the field magnets are firmly mounted on a base plate. One
end of the winding of the armature is connected by the aid of a screw with a
slightly conical pin or stud held in the bore of one of the trunnions and there
insulated by means of a tubular cap made of vulcanite or other suitable material.
A bridle piece bears against the outer end of pin or stud, said bridle nece being
suitably secured to and insulated from the face plate
Upon the other trunnion of the armature is mounted a toothed or otherwise

page_text: suitably constructed driving wheel and furthermore an eccentric cam or two-
pointed wiper wheel The latter is so constructed and mounted, that in the
moment of the flanges of the aimature core leaving the edges of fields attached
to the electro-magnets, a movable lever mounted on a evoluble pin or rod
will come into contact with a rod, such contact producing the ignition spark
As the described process takes place twice during each revolution of the armature
it follows that the production of sparks will occur twice during the same period
Owing to the continual uniform rotation of the armature the production of
sparks 18 ensured in all cases, even in motors having a velocity of 2000 and
more revolutions per minute, because sparks will be produced twice during
each separate rotation of the armature In electric apparatus hitherto known
and constructed to serve the same purpose only one spark was produced at each
complete to and fio stroke of the iron core or body, which production failed
altogether if the number of revolutions of the armature exceeded a given number,
and electro-magnetic ignition by means of such apparatus was proved ineffective
and unreliable for use in motors having a greater velocity than 600 revolutions
per minute at the outside.
·
1000
Electromagnetic Ignition Device with Revolving Armature for Gas,
Petroleum and similar Motor Engines.
I, WILLIAM PHILLIPS THOMPSON, FCS, M.I.M E, of the Agency for Foreign
Patent Solicitors, 322, High Holborn, in the County of Middlesex, 6, Lord Street,
Liverpool, and 6, Bank Street, Manchester, both in the County of Lancaster,
and Lower Temple Street, Birmingham, in the County of Warwick, Civil
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
-
The electromagnetic devices hitherto known and constructed for the purpose
of igniting the explosive compound in gas engines and the like all suffer from
the serious disadvantage that, with motors having a high 1otatory velocity,
ignition frequently does not take place because the sparks are not sufficiently
powerful or fail altogether The cause of such inefficiency is that the recipro-
cating motion of the iron core or body, used for producing the igniting spark,
and moving between the poles of a stationary field magnet and those of an,
also stationary armature, cannot follow the revolutions of a motor, running at
high speed, with sufficient rapidity, there having two dead points to be overcome
at each full stroke of the said reciprocating iron body The velocity of the
latter must therefore necessarily be of limited extent.
The object of the present invention 18 to obviate the aforesaid disadvantage
by so constructing the apparatus that the armature 18 given a continuous rotatory
movement while the poles of the field magnets remain stationary
Upon the spindle of the armature is mounted an eccentric cam two-pointed
wiper wheel or the like by means of which the spark lever 18 twice brought
into contact and twice forced out of contact with the spark rod at each revolution
of the armature spindle, any convenient transmission gear being employed for

page_text: μα μου
fail and are in all cases of sufficient strength for igniting the explosive com-
pound independently of the rotatory velocity of the motor
The new electromagnetic ignition device is illustrated in the accompanying
drawings, throughout the figures of which like letters of reference indicate like
or corresponding parts.
Figure 118 a side view of the apparatus.
Figure 2 shewa the same in longitudinal section.
Figure 3 in cross section, and
Figure 4 in horizontal section
Figure 6 illustrates the known ignition contrivance reaching into the ex-
plosion chamber
Figure 6 18 intended to shew schematically a method of operating the ignition
device, as connected with any convenient type of motor
To the core a of the armature carrying winding bare suitable secured discs c
having trunnions c² by means of which trunnions the armature is turnably held
in its bearings conveniently affixed to or cast integral with face plates m. The
latter face plates as well as the field magnets d are firmly mounted on a base
plate One end 61 Figure 4 of the winding 6 of the armature is connected by
aid of a screw with a slightly conical pin or stud held in the bone of one of
the trunnions e¹ and there insulated by means of a tubular cap 9 made of vul-
canite or other suitable material. A bridle piece n Figure 2 bears against the
outer end of pin or stud h, said bidle piece being suitably secured to, and by
means of plate o insulated from, the face plate m The electric current flows
through wire into spark rod = (Figure 5)
Upon the other trunnion e' of the armature is mounted a toothed or otherwise
suitably constructed driving wheel 7, and furthermore an eccentric cam or two-
pointed wipe wheel k The latter 18 80 constructed and mounted, that at the
moment of the flanges a¹ of the armature core a leaving the edges e¹ of pole
pieces attached to the magnets d, a movable level to mounted on a revoluble pin
or rod v will break contact with rod z, such breaking of contact producing the
ignition spark As the described process takes place twice during each revolution
of the armature, it follows that the production of sparks will occur twice during
the same period
The spaiks may be conducted into the explosion chamber of the motor in
any convenient fashion. An example 18 schematically shewn in Figure 6 of the
drawings.
It is here assumed that armature a is revolved by transmission gear from
shaft of the motor, and that the breaking off of the contact between the spark
rod z and lever w 18 effected by wiper wheel through the intermediary of
1od g, the latter being coupled with a lever t, mounted on axle r of spark lever w
and actuated by spring u and the wiper wheel k in such a manner as to make
and break contact between the spark lever w and spark rod z In the moment
of a spark being produced in the apparatus by the breaking of the contact
between rod z and lever w rod q together with the levert and axle v are so moved
by wiper wheel k, that lever we will for an instant hear against spark rod z,
when an immediate production of a powerful spark will follow
Owing to the continual uniform rotation of the armature the production of
sparks is ensured in all cases, even in motors having a velocity of 2500 and more
revolutions per minute, because sparks wil be produced twice during each
separate rotation of the armature In electric apparatus hitherto known and
constructed to serve the same purpose only one spark was produced at each
completed to-and-fro stroke of the iron core or body, which production failed
altogether if the number of revolutions of the armature exceeded a given number,
and electromagnetic ignition by means of such apparatus was proved ineffective
and unreliable for use in motors having a greater velocity than 600 revolutions
per minute

page_text: 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 18
New or improved electromagnetic ignition device in which the armature is
so journaled as to be capable of continuous and uniform rotation between the
poles of the magnets, the spark production being conducted to the spark level
by means of a suitably shaped eccentric cam, wiper wheel or the like mounted
on the spindle of the armature, and the spark rod being electrically joined to
the commutator bridle arm bearing against the end of the spindle of the arma-
ture, substantially as and for the purpose described and illustrated in the accom-
panying drawings.
011
1000
W. P THOMPSON & Co,
Of London, Liverpool, Manchester and Birmingham.