An Improved Manhole or Mudhole Door.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
An Improved Manhole or Mudhole Door.
LEWIS MARSHALL, Manager and Director Elmfield Terrace, Halifax, SAM
NAYLOR, Manager 33 West View, Halifax, do hereby declare the nature of this
invention to be as follows:-
An improved manhole or mudhole door for closing circular holes in boilers &
other vessells, the said holes being required for cleaning or access.
The improved door is circular with 2 lugs or ears which give the same an oval
appearance on the exterior. A screw or bolt attached to each lug (or passing
through the lug) is used for securing the door.
The hole in the boiler or other vessell is cut circular & then a notch is cut on
each side of the hole which allows the door to pass through the notches to the
interior, the door is then turned half round & the 2 screws or bolts come up through
the notches and are secured with two nuts.
Screws put in from the outside may be used for securing the door in lieu of bolts
& nuts.
The door may be made from any suitable metal.
LEWIS MARSHALL.
SAM NAYLOR.
An Improved manhole or muanoге Jor.
We, LEWIS MARSHALL, Manager and Director, Elmfield Terrace, Halifax,
and SAM NAYLOR, Manager and Director, 33 West View, Halifax, in the County
of York, 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 object of our invention is to construct manhole, bandhole or mudhole doors
for boilers or other vessels, so as to facilitate the opening and closing of such doors
from the outside for access or for cleaning purposes.
The improved door is circular, oval or other suitable form with side lugs or
ears to each of which are attached screws or bolts for securing the door to the
boiler or other vessel.
The hole in the said boiler or other vessel is circular with one, two or more
opposite recesses on each side of the said hole of sufficient size to allow the door to
pass through sideways, the door is then turned round so that its bolts or screws
come opposite and through the recesses and are secured with the usual nuts from
the outside, or screws may be used from the outside in liew of the said bolts, the
doors may be made of any suitable metal.

page_text: DESCRIPTION OF DRAWINGS.
Fig. 1, is a sectional elevation of part of boiler with our invention applied.
Fig. 2, is a plan showing circular hole and recesses in boiler.
Fig. 3, is a plan of manhole, handhole or mudhole door.
Fig. 4, shews modified shape of door.
A is the door, B is the round man or hand hole, with any suitable number of
recesses C, C. D are the lugs or wings for carrying the bolts, screws or studs E
with nuts F, G is the hand or finger bar for holding and manipulating the
door by.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is
1. Constructing circular manholes, handholes or mudholes of boilers or other
vessels with doors which cau be passed through and secured from the outside as
and for the purposes described.
2. In boilers and other vessels the combination of round manholes, handholes,
or mudholes B, recesses C, door A with suitable bolts, screws or studs E, substan-
tially as shown and described.
Tth dow of Tonuary 1807
JOHN E. WALSH,
Crossley Street, Halifax, Patent Agent for the Applicants.