Year: 1888

page_text: Date of Application, 26th June, 1888
Specification Accepted, 3rd Aug,
1888
We FREDERICK STITZEL and CHARLES WEINEDEL of 913 F Street, Washington
D.C. United States of America Manufacturers 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 :-
Our invention relates to improvements in telegraphic relays.
In telegraph relays and similar instruments where electromagnets and vibrating
armatures are employed, the cores of the magnets (after constant use) are liable to
retain more or less magnetism after the electric current is removed from the cores
and thus cause the armature to "stick" and produce confusion in the transmission of
signals.
It is the object of our present invention to obviate this objection and to so construct
a relay that it shall automatically adapt itself to varying strengths of the electro
magnet which actuates it.
With this object in view our invention consists in certain novel features of con-
struction and peculiar combination and arrangement of parts as will be hereinafter set
forth and pointed out in the claims.
In the accompanying drawings
Fig. 1 is a side elevation of my improved relay.
Fig. 2 is a detached view of the abutments.
Fig. 3 is a view of a modified form of abutment.
A indicates a base of wood or other suitable material, upon which is mounted near
one end, an electro magnet B, the coils of which are connected to the main line as
nsnal

page_text: Fixed upon the base A near the magnets B is a standard or upright C, which extends
somewhat above the magnets and serves as a support for a lover fulcrumed thereto
at a. The short arm of this lever D is furnished near its free and with an armaturo c
to be attracted by the magnet.
Near the opposite end of the base from the standard O, is a short post or upright E
supporting at its upper end an insulated block E', upon which Intter one end of a
contact spring F is secured in any preferred manner. The spring curves upward
and outwardly from its connection with the block as shown in Fig. 1.
A laterally projecting pin e fixed to the long arm of the lover D is adapted to
engage the outer face of the spring F when the arinature is actuated by the magnet B.
By this construction of the spring F a firm contact is insured between said spring and
the pine when the lever D is turned in one direction.
An arm secured to the post E is bent upwardly and forms a rest for the free end
of the long arm of the lovor D and may also be provided at its top with a contact
point f
Suitable binding posts hij klare secured to the base A, the posts and i being
connected with the magnet coils and having the main line wires attached to them.
If it be desired to use the instrument as a single contact relay the wires of the
local circuit will be fixed to the binding posts ik said binding posts being connected
with the lever D and contact spring Frespectively. When it is desired to employ a
double contact, the arm (+ will be included in the local circuit this arm being preferably
connected with the binding post 7.
Secured to the top of the standard C and extending therefrom in a line parallel
with the long arm of the lever D is an arm H provided with two or more perforations
for the reception of a series of adjustable spring sustained pins or abutments I, 1', I.
These abutments are cach, composed of a short pin m screw threaded at its upper
end for the reception of a nut n and a plate o secured near its lower end, a spring p
being inserted between said plate and the arm H through which the abutment pins
loosely pass. The tension of those pins and their distance from the lover may be
easily regulated by means of the nuts n.
The arm 6 of the lever D may be made sufficiently heavy to cause it to drop when
not actuntod by the magnet or if desired a light spring J may he employed.
The abutment pins m are adjusted at different distances from the lever D from end
to end of the series. Should the magnets become sufficiently strong to overcome the
tension on the lover D) the first abutment pin will be struck by the lever and prevent
the armature from approaching sufficiently near the magnets to stick.
Should the magnets become strong enough to overcome the tension of the first
abutment, the lever will strike the second in conjunction with the first and so on
throughout the series of abutments.
It will be understood that under ordinary circumstances the lever will have sufficient
play to make and break the local current without materially affecting any of the abut-
ments, but as soon as the magnet gets stronger than the tension on the lever, the
latter will strike the first abutment, and then the second, and so on in unison with the
varying strength of the magnet. Thus it will be seen that the device is automatically
adapted to the varying strength of the magnet.
In lien of the construction of abutments above described, coiled springs may be
employed having their upper ends passed through perforations in the arm H, and
screw threaded for the reception of the nuts n. by which the spring may be adjusted
in any desired position. With this arrangement the lover D will abut directly against
the ends of the springs.
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 wo
claim is,
1. In a rolny, the combination with an electro magnet and a pivoted lever of a series

page_text: 2. In a relay, the combination with an electro magnet and a pivoted lever of a series
of yielding abutments in the path of said lever, and a spring contact with which said
lever nakes contact substantially as set forth.
3. In a relay, the combination with an electro magnet and a pivoted lever carrying
an armature at one end and a contact point near the other end of an arm, yielding
abutments mounted therein, a curved spring secured to a suitable post and adapted to
engage said lever, and an arm with which the lever makes contact substantially as set
forth.
Dated this 26th day of June 1888.
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C.,
Agents to Applicants.