An Improved Binding Post or Device for Connecting Electrical Apparatus.
Year: 1899

page_text: Date of Application, 11th May, 1899 - Accepted, 17th June, 1899
Communicated from abroad by ALBERT RICHARDSON SHATTUCK, of No. 11, Broad-
way, New York City, United States of America, Gentleman].
An Improved Binding Post or Device for Connecting Electrical
Apparatus.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
45, Southampton Buildings, in the County of Middlesex, 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 invention provides a means for electrically connecting a conducting wire or
cable to any electrical appliance, such, for example, as an induction coil, in such
a manner as that the connection will be completely impervious to moisture, either
at the joint or elsewhere.
In the accompanying drawings, Fig. 1 is an enlarged cross-sectional view of my
improved binding post and connection. Fig. 2 shows in perspective two of said
binding posts in place upon the enclosing case of an electrical appliance.
Similar letters of reference indicate like parts.
A is a metal rod screw threaded on its exterior and placed on the side of the
case B of non-conducting material, and connected to any electrical appliance within
the case by the wire C.
D is a tubular cylinder of metal closed at one end, and threaded both inside and
outside. The external thread of cylinder D engages with the internal thread of an
enclosing cylinder E which is made of hard rubber or other insulating material.
Cylinder E at its closed end has an opening through which passes the conducting
wire F which is secured to cylinder D. It may have a coating of cotton G, and
outside of said coating a covering H of soft rubber which is secured by cement
at J in the opening in cylinder E.
The post A is received in the threaded bore of cylinder D, which is screwed
down upon said post. Between the lower edge of cylinder D and the side of the
case B is interposed a soft rubber washer I.
By this construction I obtain a perfectly water tight connection. The wire C
being covered by rubber is impervious to moisture; so also is the joint at J. The
rubber cylinder E protects the inner metal cylinder D. The cylinder D does not
completely fill the enclosing rubber cylinder E; hence the joint between the
cylinder E and case B is between rubber faces and is packed, by the screwing down
of cylinder D upon post A thus compressing washer I. The enclosing case may
be of any desired form.
The invention is especially applicable to induction coils such as used for the
production of igniting sparks for gas engines etc., wherein it is important that the
coil and all its connections should be protected from moisture, as otherwise the
efficiency of the coil rapidly deteriorates. Such a coil would therefore be enclosed
in the case represented in Fig. 2 with its terminals united to binding posts as
shown, constructed in the manner already explained.

page_text: In the specific construction shown in the drawings I have represented the
cylinder Das externally threaded, and engaging with the internally threaded
cylinder E of non-conducting material; but it is to be distinctly understood that
I do not limit myself to this mode of securing the external cylinder upon the
internal cylinder, since it is obvious that I may make said cylinders smooth inter-
nally and externally in lieu of screw threaded, and secure them together by means
of cement or by any other suitable means.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, as communicated to me
by my foreign correspondent, I declare that what I claim is:
1. A connecting device for electrical apparatus comprising the tubular cylinder D
of conducting material having one end closed, the enclosing tubular cylinder E
of non-conducting water-proof material and closed at one end and receiving and
secured to said cylinder D, the conducting wire F extending through said cylinder E
and electrically connected in said cylinder D, and the insulating water-proof
coating of said wire forming an impervious joint with said cylinder E, substantially
as described.
2. The combination of an externally threaded binding post and support therefor
with the connecting device specified in Claim 1.
Dated this 10th day of May 1899.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.