Improvements in Manhole and Handhole Covers for Boilers and other Vessels under Pressure.
Year: 1893

page_text: Date of Application, 18th Sept., 1893
Complete Specification Left, 14th June, 1894-Accepted, 15th Sept., 1894
PROVISIONAL SPECIFICATION.
Improvements in Manhole and Handhole Covers for Boilers and
other Vessels under Pressure.
SAMUEL DIPLOCK of Wyndcliffe 47 Longfield Road Bishopston Bristol
Engineer, do hereby declare the nature of this invention to be as follows:-
==
Within the boiler or vessel requiring to be sealed to withstand a pressure
I have a specially constructed removable arched cross bar or bridge made with
a screwed bolt & nut firmly fitted to this said bridge & a lug or arm projecting
on the side of this bridge, so that when the cover is being screwed down or
unscrewed for removal this arm or lug in its transit comes in contact with the
side of the boiler or vessel & is thereby blocked. The cover itself made dish
shape with a hole in the bottom through which the bolt passes. On this cover
I place another lug so that in its movement likewise becomes locked against the
inner lug on the bridge thereby interlocking both the bridge & the cover, which
being screwed down to the plate or surface having a layer of jointing material
a direct pressure is attained and secure joint made.
Dated this 15th day of September 1893.
COMPLETE SPECIFICATION.
Improvements in Manhole and Handhole Covers for Boilers and
other Vessels under Pressure.
SAMUEL DIPLOCK Engineer 47, Longfield Road Bishopston Bristol 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:
On a cross bar or bridge made of any metal is constructed a projecting arm or
lug with a bolt having a screwed end and nut & affixed to this bridge. Also on
the cover there is constructed a projecting lip or lug and a similar arrangement on
the inner part of the bridge. The action of tightening or screwing up the nut
on the bolt, for the purpose of fixing the cover to the boiler, brings the arm or lug
on the bridge in contact with the boiler plate and thereby prevents the movement
of the bridge. In like manner the same operation will cause the lugs on the cover
and the bridge to become interlocked, so that the jointing material placed between
the boiler and the cover is directly compressed and thereby all traversing motion
of either the bridge or the cover is prevented. The same results are obtained in
the removal of the cover by the reversed action of the lugs on the bridge and the
cover.
The description of invention is as follows.

page_text: -
G. The lug or lip on the bridge or cross bar.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what [
claim is
1. On a bridge or cross bar a projecting arm or lug.
2. On a bridge or cross bar on the inner part a lip or lug and on a cover a
similar arrangement.
3. The construction and combined arrangements of lugs & projections on the
bridge & cover formed in each case as a part of the bridge and the cover.
Dated this 13th day of June 1894.
SAMUEL DIPLOCK.