Year: 1897

page_text: JOHN HODKINSON of Union Street, Burton-on-Trent Manager and THOMAS
HODKINSON of 86 Alfreton Road, Nottingham Gas Fitter do hereby declare the nature
of this invention to be as follows:-
This invention relates to an improved lock or fastening particularly suitable for
manhole covers, hydrant covers, and other similar covers in which an ordinary_lock_or_
fastening-is-liable to be rendered unworkable by dirt, the object of the present
invention being the construction of a lock or fastening which overcomes the
objections to the ordinary lock or fastening.
According to this invention the key hole, of any suitable shape is placed at one
side of the lock instead of near the centre of the same as is usual, and the Key is
arranged to operate upon a sliding or pivotted spring bolt, either direct or through an
intermediate lever. In modifications there may be two or more spring bolts, either or
both of which may be pivotted.
The improved lock or fastening may be carried by the cover or casing and there is
a slot or recess in the casing or cover for receiving the end of the spring bolt.
1*
W. H. POTTER, Wh., Sc.,
Patent Agent, Nottingham.
JOHN HODKINSON of Union Street, Burton-on-Trent manager and THOMAS
HODKINSON of 86 Alfreton Road Nottingham Gas Fitter 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 an improved lock or fastening which is particularly
applicable to covers for manholes, hydrants and similar purposes, the object of the
invention being the production of a lock or fastening which may be used on covers of
the kind referred to without the same liability of being clogged by dirt as are the
locks and fastenings usually employed for the same purpose.
According to this invention the key hole is placed at the side of the lock or
fastening instead of over the same as is usually done and the Key is arranged to act
upon a spring bolt or catch which is carried and guided by the cover or casing,
preferably by the former. The Key may operate the bolt direct or through pivotted
levers, and it may be arranged to operate two bolts if desired.
The accompanying sheet of drawings illustrate the application of the invention to
a case and cover similar to those used for hydrants. On this drawing.
Fig. 1 is the plan of a case and cover with the improved lock or fastening attached.
Fig. 2 is a plan of the under side of the lid.
K2 an olovation of hand

page_text: Fig. 4 is an elevation of the Key used with the lock or fastening shown in
Figs. 1, 2, and 3.
The box a shown square, may be of other shape, and is fitted with a hinged lid b
which rests when closed on corner pieces c. On the under side of the lid there are two
guides d and d made to receive the bolt e which is fitted to slide therein. This bolt
is made with a projection e¹ upon which the key acts and between the inner side of
the same and the guide d' there is a spring f which holds the bolt in its forward
position. In the particular arrangement shown the key hole g is at the side of the
bolt and the key used is of the shape shown on Fig. 4. The side of the box is
provided with a recess or slot to receive the end of the bolt when the lid is closed,
and the end of the bolt is by preference bevvilled as shown. The key hole may be of
a particular shape and the key shaped accordingly and there may be projecting pieces
on the under side of the lid so that the active part of the key must necessarily be of
a particular shape. .
In modifications of the arrangement shown there may be a lever between the bolt
and key, or a pivotted catch may be used instead of a sliding bolt, and there may be
two bolts actuated by the same key simultaneously but in all cases the key hole is
placed outside the lock or fastening.
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. A lock or fastening for the purposes herein specified, comprising a spring bolt
or pivotted spring latch, and a key hole so placed that dirt passing through the same
will fall clear of the bolt or catch substantially as described.
Dated this sch day of May 1890.
W. H. POTTER,
Patent Agent, Nottingham.