Improvements in Electro magnets for Holding Tools, Lamps, Brackets, or other Articles, and for Telegraphic and other Apparatus.
Year: 1891

page_text: Date of Application, 1st June, 1891
Complete Specification Left, 29th Feb., 1892-Accepted, 2nd Apr., 1892
PROVISIONAL SPECIFICATION.
Improvements in Electro magnets for Holding Tools, Lamps,
Brackets, or other Articles, and for Telegraphic and other
Apparatus.
,
We, FREDERICK JOHN ROWAN, of 121, West Regent Street, Glasgow, in the
County of Lanark, North Britain, and WILLIAM MCWHIRTER, of the Faraday
Electric Works, Govan, in the same County, Electrical Engineers, do hereby
declare the nature of this invention to be as follows, that is to say :-
Our said invention has for its object by an improved construction to render
electro-magnets more conveniently and satisfactorily applicable for firmly holding
tools, lamps, brackets, or other articles upon iron or other magnetic structures or
for use in telegraphic and other apparatus in cases in which it is desired to
concentrate the magnetic action on parts not conveniently accessible with ordinary
arrangements.
In carrying out our invention we have a soft iron core with an electric exciting
coil wound upon it, and having fixed at one end an iron plate or yoke, which may
be part of the apparatus to be supported. To the plate or yoke we fix an iron
cylinder enclosing the electric coil, which cylinder may be shorter than the core,
and may have a portion of its outer rim cut away, so as to concentrate the magnetic
action at one part. Or we may fit on the cylinder an iron ring made adjustable out
or in or circularly, and forming a projecting part of the cylinder, but with one
part projecting more than the rest and thickened to form a contact or pole
surface.
One magnet of this improved construction is sufficient for holding on a portable
electric drill or other tool. The drill spindle or acting part is arranged as near as
conveniently possible to the outer cylinder of the magnet, and the pole projection
is adjusted between that part and the magnet core, or in a position such that the
acting strain of the tool will have little or no tendency to prize the apparatus away
from the surface to which it adheres.
In a similar way when applied for holding a lamp, or bracket, or other article the
pole of the enclosing cylinder can be adjusted in the best position for imparting
steadiness, and preventing detachment by leverage action.
In telegraphic, telephonic, and analogous apparatus the adjustability in position
of the pole of the enclosing cylinder will in many cases admit of more convenient
arrangement of parts than is possible with electro magnets of ordinary con-
struction.
Dated this Twenty-ninth day of May 1891.
EDMUND HUNI,
Applicants' Agent.
COMPLETE SPECIFICATION.
Improvements in Electro-magnets for Holding Tools, Lamps,
Brackets, or other Articles, and for Telegraphic and other
Apparatus.
We. FREDERICK JOHN ROWAN, of 121 West Regent Street, Glasgow, in the
County of Lanark, North Britain, and WILLIAM M WHIRTER, of the Faraday
Electric Works, Govan, in the same County, Electrical Engineers 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, that is to say :-
Our said. invention has for its object by an improved construction to render

page_text: electro magnets more conveniently and satisfactorily applicable for firmly holding
tools, lamps, brackets or other articles upon iron or other magnetic structures, or
for use
in telegraphic and other apparatus in cases in which it is desired to
concentrate the magnetic action on parts not conveniently accessible with ordinary
arrangements.
In carrying out our invention we have a soft iron core with an electric exciting
coil wound upon it, and having fixed at one end an iron plate or yoke, which may
be part of the apparatus to be supported. To the plate or yoke we fix an iron
cylinder enclosing the electric coil, which cylinder may be shorter than the core,
and may have a portion of its outer rim cut away so as to concentrate the magnetic
action at one part. Or we may fit on the cylinder an iron ring made adjustable out
or in or circularly, and forming a projecting part of the cylinder, but with one
part projecting more than the rest and thickened to form a contact or pole
surface.
On two accompanying sheets of explanatory drawings are shown examples of some
of the applications which may be made of our improved electro-magnets.
Figures, 1, and 2, on Sheet, 1, are side and front elevations of an electrically
driven drill as provided with an electric holding-on magnet of our improved con-
struction, and
Figure, 3, is a section of the magnet.
Figure, 4, on Sheet, 2, is a sectional elevation of a portable incandescent lamp
with the improved magnet; and
Figure, 5, is a sectional elevation showing the application of the improved magnet
to a Morse sounder telegraph instrument.
In these drawings the same reference letters are used to mark the same or like
parts wherever they are repeated.
In the example shown in Figures 1, 2, and 3, the core A., having on it an exciting
coil, B, and, the outer iron cylinder, C, are fixed to an iron plate or yoke, D, which
carries the drill details. An iron ring, E, is fitted upon the cylinder, C, and is
formed with a pole part, F, which projects more than the other part and is
thickened. The ring, E, is made with a flanged division and can be clamped by a
screw bolt, G, in any desired position upon the cylinder, C.
One magnet of this improved construction is sufficient for holding-on a portable
electric drill or other tool. The drill spindle or acting part, H, is arranged as near
as conveniently possible to the outer cylinder, C, and ring, E, of the magnet, and
the pole projection, F, is adjusted between that part, H, and the core, A; or in a
position such that the acting strain of the tool will have little or no tendency to
prize the apparatus away from the surface to which it adheres. To assist in keeping
the apparatus steady there is fitted to an extension of the yoke or plate, D, at a
part diametrically opposite to the drill spindle, a screwed spindle, J, which can be
adjusted with its end bearing on the iron plate or structure to which the apparatus
is magnetically attached. For driving the drill, H, an electro motor, K, is arranged
as part of the apparatus its shaft being connected with the drill spindle by speed-
reducing spurwheel gearing contained in a box, L, fixed on the yoke or plate, D.
and having fixed to it the framing, M, carrying the motor and details connected
with the drill spindle.
i
When applied for holding a lamp or bracket, or other article, the enclosing
cylinder, C, can be arranged or adjusted with its pole, F, in the best position for
imparting steadiness, and preventing detachment by leverage action of the over-
hanging weight of the article or of any part of it. Thus in the case of an incandescent
lamp such as is shown in Figure, 4, with its holder adapted for being magnetically
attached to a vertical surface, the cylinder, C, which in this example has the pole,,
formed on it, is arranged with the pole above the core, A, when the lamp is in the
position for being attached.
In telegraphic, telephonic, and analogous apparatus the possibility of arranging
or adjusting the position of the pole, F, of the enclosing cylinder, C, will in many
cases facilitate the adoption of a more convenient arrangement of parts than is

page_text: possible with electro magnets of ordinary construction. Thus in the example shown
in Figure, 5, the electro magnet is placed with its outer cylinder, C, arranged with
its pole, F, in a position to act near the outer end of the armature lever, N, and
close to the stops, P, between which the lever vibrates.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
The improved electro magnets, constructed in each case with a soft iron core, an
electric exciting coil encompassing the core, an outer iron cylinder encompassing
the coil, and an iron plate or yoke connecting the core and outer cylinder, the said
outer cylinder being made with a projecting pole at one part of its outer end, or
being provided with an adjustable iron ring having a pole at one part of it,
substantially as and for the purposes hereinbefore described.
Dated this Twenty-seventh day of February 1892.
EDMUND HUNT,
Applicants' Agent.