An improved Ventilating Cover for Drain Traps.
Year: 1899

page_text: Date of Application, 21st Mar., 1899
Complete Specification Left, 12th Dec., 1899-Accepted, 3rd Feb., 1900
An improved Ventilating Cover for Drain Traps.
I, JOHN FLEMING WALLACE, of 4, George Street, Grahamston, Housefacior,
do hereby declare the nature of this invention to be as follows:-
This invention relates to an improved ventilating cover for drain traps and has
for its object to prevent the covers being tampered with or getting lost. In
accordance with my invention, I secure the one end of the cover to its frame
by means of a hinge and the other end of the cover is secured by means of a self-
closing lock below the cover. The lock may consist of a trigger which is pivotted
to the under side of the perforated or ventilating cover, the frame portion within
which the cover fits, having its edge formed with a recess in such a way that
when the cover falls or is closed down, the trigger under the influence of a
spring, automatically engages itself below the edge of the cover frame. In order
to unlock the cover, a piece of wire, or key, having a bent end is inserted through
a small hole in the cover or it may be through one of the ventilating holes so that
by giving a motion of partial rotation to the key, the trigger is forced out of
engagement with the end of the frame.
DL: 004.
1 1000
JOHNSONS,
Petitioner's Agents,
115, St. Vincent Street, Glasgow.
I, JOHN FLEMING WALLACE, of 4, George Street, Grahamston, Falkirk, House-
factor, 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 a self-locking and lock fast ventilating cover for
drain traps and has for its object to prevent the covers being tampered with or
getting lost and the consequent choking of drains.
In accordance with my invention and as shewn in the accompanying drawing
which is a perspective view of a frame and cover, open, I secure the one end of
the cover A to its frame B by means of a hinge whilst the other end is secured
by means of a self-closing lock below the cover. The said lock consists of a
trigger or bolt C pivoted to the under side of the perforated or ventilating cover,
upon a plate D formed in one with the cover or removably attached to it. The
[Prise d

page_text: trigger or bolt pivots upon a stud d and is acted upon by a spring Ę carried by a
button-like projection I, and bearing against a bar f which enables the spring
to repel the trigger or bolt automatically into a recess formed in the frame
portion within which the cover fits, when the latter falls or is closed.
In order to unlock the cover, a key having a bent end is inserted through one
of the ventilating holes, G, in the cover so that by giving a motion of partial
rotation to the key, the trigger or bolt is forced out of engagement with the
recess in the frame.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed I declare that what I
claim is: :-
The self-locking and lock fast ventilating cover for drain traps, constructed sub-
stantially in the manner as and for the purposes herein before described and shewn
in the accompanying drawing.
9.
JOHNSONS,
Applicant's Agents,
115, St. Vincent Street, Glasgow.
Dated this 11th day of December 1899.
JOHNSONS,
Applicant's Agents,
115, St. Vincent Street, Glasgow.