An Improvement in Cellar Flaps.
Year: 1891

page_text: Date of Application, 9th Oct., 1891
Complete Specification Loft, 8th Aug., 1892-Accepted, 17th Sept., 1892
PROVISIONAL SPECIFICATION.
An Improvement in Cellar Flaps.
We, ARTHUR PYE-SMITH, and FREDERICK ALMA HAMILTON, both of the
St. Pancras Iron Works, St. Pancras Road, in the County of Middlesex,
Engineers, do hereby declare the nature of this invention to be as follows:-
This invention relates to an appliance to a cellar flap whereby its raising is
facilitated and it is prevented from closing with great force and noise as it does
when it is allowed to drop.
For this purpose we pivot the flap where the hinge usually is at the one side in
the fixed frame, and at the other side we fix to the frame one end of a steel rod the
other end of which is attached to the flap, it may be at or about the middle of its
width.
As the flap descends to close, it necessarily twists this rod which resists the
descent with increasing force as the flap descends thus causing it to close without
violence.
The rod being twisted when the flap is closed exerts a force which aids in raising
it. The torsion spring such as is above described may obviously be duplicated,
one being provided at each side of the flap, and one or both may be employed in
addition to the ordinary hinging.
Dated this 9th day of October 1891.
ABEL & IMRAY,
Agents for the Applicants.
COMPLETE SPECIFICATION.
An Improvement in Cellar Flaps.
We, ARTHUR PYE-SMITH, and FREDERICK ALMA HAMILTON, both of the
St. Pancras Iron Works, St. Pancras Road, in the County of Middlesex,
Engineers, 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 appliance to a cellar flap whereby its raising is
facilitated and it is prevented from closing with great force and noise as it does
when it is allowed to drop.
For this purpose we pivot the flap where the hinge usually is at the one side in
the fixed frame, and at the other side we fix to the frame one end of a steel rod
the other end of which is attached to the flap, it may be at or about the middle of
its width.
Fig. 1 of the accompanying drawings shews a longitudinal section of part of a
cellar flap and its frame with the flap in its closed condition and
Fig. 2 shews a similar section with the flap in its open condition.
The cellar flap F at its one side works on a pivot in the fixed frame (not shewn
in the drawing) and at or about the middle of its width has fixed to it the one end
of a steel rod a by means of a lug band screw bolt c. This rod a is at its other
it is
end fixed in the frame G at d, passing through a hole in a lugf on the underside of
the cellar flap, so that although the flap is free to turn round the rod
supported in its position at that side by the rod.
As the flat F descends to close, it necessarily twists this rod a as shewn in Fig. 1
which consequently resists the descent with increasing force as the flap descends
thus causing it to close without violence.

page_text: The rod a being twisted when the flap is closed, exerts a force which aids in
raising it. The torsion spring such as is above described may obviously be
duplicated, one being provided at each side of the flap, and one or both may be
employed in addition to the ordinary hinging.
In place of the rod above described we sometimes use a spring formed of two or
more steel plates. -
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
In combination with a cellar flap and its framing one or more torsion springs
arranged and operating substantially as and for the purpose herein described.
Dated this 8th day of August 1892.
ABEL & IMRAY,
Agents for the Applicants.