UNITED STATES PATENT OFFICE
JOSEPHUS C. CHAMBERS, OF NEWPORT, KENTUCKY.
IMPROVEMENT IN LIGHTNING-RODS AND INSULATORS.
SPECIFICATION forming part of Letters Patent No. 194,220, dated August 14, 1877; application filed May 29, 1877.
To all whom it may concern:
it known that I, JOSEPHUS C. CHAMBERS,
of Newport, Campbell County, Kentucky, have invented a new and useful
Improvement in Lightning-Rods and Insulators, of which the following is
invention relates to a form of glass or other suitable insulator for
lightning-rods and similar conductors.
the accompanying drawings, Figure 1 is a partially sectional elevation
of a rod and insulator embodying my improvements. Fig. 2 is a
perspective view, showing a series of the insulators supported by
standards from the comb of a roof, and one for the attachment of the
ground portion of the rod. Fig. 3 is a detailed view on a larger scale.
insulator A is of glass, and may have the usual interior screw a, for
attachment to a suitably screw-threaded stem or post, B. The said
insulator expands at bottom into a shield, C, the flaring form of which
adapts it to serve as a hood, preventing the electric current reaching
the post B in a nearly vertical line, and has in its crown a notch, C',
to receive and hold the rod D. Said
insulator has also a circumferential groove, B, for the reception and
retention of the wire F, wherewith the rod is bound fast to the
For a spiral rod, such as D', Fig. 3, the bottom of the notch C' may have oblique indentations, as at c, to prevent the overturn or displacement of the rod by high winds or other causes; but I find in practice that the flanges of the spiral rod afford so secure a hold for the tying-wire that
when said wire
is tightly applied the rod is firmly held against turning, even without
the supplemental notches c.
practice I place the points G G' at least six feet apart, and not less
than six feet above the building. When
both points are upon a single insulator, one of them may be multiple in
form, as at G', Fig. 1.
claim as new and of my invention--
The spiral rod constructed with a horizontal attaching portion and one
or more upturned receiving-points, in combination with the insulator
constructed with a summit groove to receive the rod and a
circumferential groove for the tying-wire to secure said rod in
position, substantially as described.
The combination of the main groove C', for the reception of the rod, and
the supplementary oblique grooves c, to receive the spiral flanges of
the rod, and prevent it from turning.
A lightning-rod insulator constructed as herein shown, with a
screw-socket for application to the post, an enlargement below the said
screw-socket to prevent contact between the post and the neck of the
insulator, and an umbrella-shaped flange expanding downward from the
neck, serving to shed the rain and as a shield.
testimony of which invention I hereunto set my hand.
JOSEPHUS C. CHAMBERS.