An Improvement in Door Checks.
Year: 1890

page_text: Date of Application 7th Mar., 1890
Complete Specification Left, 5th Dec., 1890-Accepted, 10th Jan., 1891
PROVISIONAL SPECIFICATION.
An Improvement in Door Checks.
I, RICHARD MORRIS, of Bennett Park, Blackheath, in the County of Kent,
Engineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to that kind of door check in which the slamming of the
door is prevented by the movement of a piston in a cylinder displacing fluid through
a throttled passage. I joint to the door a rigid arm projecting forward from the
cylinder, the piston rod of which projects forward through a gland in the cylinder
cover. 1 link the front end of the piston rod by two side rods to a joint on the door
jamb behind, the centre of this joint being farther from the face of the door than
that of the joint by which the cylinder arm is connected to the door.
At the side of the cylinder I form a passage by which fluid can flow from the one
end of the cylinder to the other, and I more or less throttle this passage by a taper
screw plug. Through the piston there is an aperture provided with a check valve, or
when the piston is packed by a cup leather directed backwards, this aperture and
check valve can be dispensed with. In some casos, where there is no separate spring
or appliance for closing the door, instead of linking the side rods above mentioned
to a joint on the jamb, I connect them to a volute or other spring fixed on the door
jamb, so that the apparatus operates as a door spring as well as a door check. As
the door is opened the piston is made to move forward, and the fluid with which the
cylinder is charged, which may be air, flows freely past the check valve or the cup
leather to the other side of the piston. As the door closes, the piston is forced
backwards but as the passage for Huid is throttled the movement is retarded so that
the door is prevented from slamming.
Dated this 7th day of March 1800
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improvement in Door Checks.
I, RICHARD MORRIS, of Bennett Park, Blackheath, in the County. of Kent,
Engineer, do hereby declare the nature of this invention and in what manner the
same is to be perforined to be particularly described and ascertained in and by the
following statement :-
My invention relates to that kind of door check in which the slamming of the
door is prevented by the movement of a piston in a cylinder displacing fluid through
a throttled passage. I joint to the door a rigid arm projecting forward from the
cylinder, the piston rod of which projects forward through a gland in the cylinder cover.
I link the front end of the piston rod by two side rods to a joint on the door jamb
behind, the centre of this joint being farther from the face of the door than that of
the joint by which the cylinder arm is connected to the door.
At the side of the cylinder I form a passage by which fluid can flow from the one
end of the cylinder to the other, and I more or less throttle this passage by a taper
screw plug. Through the piston there is an aperture provided with a check valve, or
Dill

page_text: when the piston is packed by a cup leather directed backwards, this aperture and check
valve can he dispensed with. In some cases, where there is no separate spring or
appliance for closing the door, instead of linking the side rods above mentioned to a
joint on the jamb, I connect them'to a volute or other spring fixed on the door jamb,
so that the apparatus operates as a door spring as well as a door check. As the door is
opened the piston is made to move forward, and the fluid with which the cylinder is
charged, which may be air, flows freely past the check valve or the cup leather to the
other side of the piston. As the door closes, the piston is forced backwards but as
passage for fluid is throttled the movement is retarded so that the door is
prevented from slamming.
the
st.
Fig. 1 of the accompanying drawings is an elevation and Fig. 2 is a sectional
plan of a door check according to iny invention. A 'is the cylinder having a passage
from the one end to the other which can be more or less throttled by an adjustable
screw plug B.
The cylinder is fitted with a piston Chaving through it a passage provided
with a check valve D. Or the piston may be packed with a cup leather as
shewn in Fig. 3 with its lip directed backwards in which case the valve D may be
dispensed with. The cylinder A is rigidly attached to a rod E which is hinged to the
door at F, and it is preferred to make this point at a considerable distance from
the door hinges so as to give the check considerable leverage. The piston rod G
which passes through a stuffing box in the cylinder cover is attached to a crosshead H
from which two side rods K extend backwards and are hinged to a bracket L
projecting from the hanging style of the door. On the upper and lower sides of the
cylinder A there are projections O which are hollowed to receive the side rods K,
these acting as guides to the cylinder as it slides along them.
As shewn in Fig. 2, the door spring is a helical spring M within the cylinder.
Instead of this the spring may be, as shewn in Fig. 4, a volute spring N, or a pair of
these each having-its one-end-attached to one-of-the-side-rods-K, and its other end
-attached to the fixed pin P of the bracket L, the spring or springs being preferably
enclosed in a barrel Q, otherwise the door spring may be entirely separate from the
check.
Having now particularly described and ascertained the nature of 'this inven
tion and in what manner the same is to be performed, I declare that I am
aware that the several characteristic features of the combination stated in my 'claim
are not novel and I desire my claim to be understood as limited to the specific
combination stated, but what I claim is :-
A door check, the cylinder of which is attached to a rod extending forwards along
the door and jointed thereto at a distance from the hanging style, and the piston is
attached by a crosshead to two side rods extending backwards and jointed to a
bracket projecting from the hanging style, substantially as described.
Dated this 3rd day of December 1890.
ABEL & IMRAY,
Agents for the Applicant.