Improvements in Clamps that may be employed in combination with Man Hole and Ĥand Hole Covers for Boilers, Steam Chests, and the like.
Year: 1893

page_text: Date of Application, 23rd June, 1893
Complete Specification Left, 24th Mar., 1894-Accepted, 5th May, 1894
PROVISIONAL SPECIFICATION.
Improvements in Clamps that may be employed in combination
with Man Hole and Ĥand Hole Covers for Boilers, Steam Chests,
and the like.
I, JOHNSON MILLS, of Victoria Buildings, Manchester, in the County of
Lancaster, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to clamps that may be employed in combination with
manhole and hand hole covers either of an oval or oblong or other form, and to.
which said covers are bolted.
In the accompanying drawing Fig. 1, is a side view and Fig. 2 is plan of a clamp.
constructed according to this invention.
I form from a bloom of steel or iron by means of suitable dies in either a steam
hammer or a drop hammer, or hydraulic press, a clamp such as a, with four claws b
as represented on the drawing.
In applying my invention the cover is placed over the aperture on the inside of
the boiler or other vessel, and the claws b take their bearing on the outer edge of
the aperture; by these means, when an oval or oblong cover is employed, a firm
and equal bearing is obtained by the use of one central bolt for securing said.
cover.
Dated this 22nd day of June 1893.
THOMAS PRESCOTT,
53, Arcade Chambers, St. Mary's Gate, Manchester,
Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Clamps that may be employed in combination
with Man Hole and Hand Hole Covers for Boilers, Steam Chests,
and the like.
1, JOHNSON MILLS, of Victoria Buildings, Manchester, in the County of
Lancaster, 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 :-
This invention relates to clamps that may be employed in combination with man
hole and hand hole covers, either of an oval, or oblong, or other form, and to which
said covers are bolted.
In the drawings left with the Provisional Specification, Fig. 1 is a side view and
Fig. 2 is plan of a clamp constructed according to this invention.
I form from a bloom of steel or iron by means of suitable dies in either a steam
hammer or a drop hammer, or hydraulic press, a clamp such as a with four claws
as b, as represented on the drawing: In applying my invention the cover is placed
over the aperture on the inside of the boiler or other vessel, and the claws b take
their bearing on the outer edge of the aperture; by these means, when an oval or
oblong cover is employed, a firm and equal bearing is obtained by the use of one.
central bolt for securing said cover.

page_text: Having now particularly described and ascertained the nature of this my said
invention and in what manner the same is to be performed, I declare that what I
claim is :-
In clamps that are employed in combination either with man hole or hand hole
covers, the construction of said clamps with four prongs as b, formed from a bloom
of steel or iron, in the manner and for the purpose substantially as herein before
described.
Dated this 21st day of March 1894
THOMAS PRESCOTT,
53, Arcade Chambers, St. Mary's Gate, Manchester,
Agent for the Applicant.