IMPROVEMENTS IN DOOR CHECKS
Year: 1885

page_text: I, JOSEPH SPARROW BANKS, of East Moor Road Wakefield, in the County of
York, Engineer do hereby declare the nature of my invention for "IMPROVEMENTS
IN DOOR CHECKS" to be as follows:-
The object of my invention is to arrange an apparatus to be fixed out of sight,
for preventing the slamming of doors in the closing of the same which I accomplish
in the following manner.
•
To the underside of the door I secure an arm, and attach the same to a spindle
that is mounted in a casing fixed in a recess formed in the floor close to the hinged
jamb. To one portion of the spindle I secure a coiled spring, which is also attached
to the casing in such a manner, that when the door is opened the spring is coiled
closer around the spindle to which is also secured a crank lever with a piston
attached thereto, fitted with a small air valve, and mounted in a cylinder supported
by a stud at the back or solid end.
On opening the door, the spring is coiled up and the piston moved towards the
open end of the cylinder, the small valve admitting air to the opposite side, between
the piston and solid end of the cylinder, and when the door is liberated, the spring
uncoiling closes the same, but is checked or prevented slamming against the jamb
by the air being compressed and thereby forming a cushion in the cylinder.
C
:
WAUGH & CHAPMAN,
70, Chancery Lane, W.C.
I, JOSEPH SPARROW BANKS, of East Moor Road, Wakefield, in the County of
5 York, Engineer do hereby declare the nature of my invention for IMPROVEMENTS
IN DOOR CHECKS and in what manner the same is to be performed, to be par-
ticularly described and ascertained in and by the following statement:-.
The object of my invention is to arrange an apparatus to be fixed out of sight,.
for preventing the slamming of doors in the closing of the same, and consists in

page_text: securing by preference to the underside of the door an arm which is attached to a
spindle mounted in a casing and to which is secured a coiled spring and a crank
lever with piston attached thereto fitted with an air valve and mounted in a
cylinder that is supported by a stud at the back or solid end.
In the accompanying drawings Figure 1 represents a section shewing the interior
of my apparatus. Figure 2 is a plan of the same with the top plate removed:
Figure 3 a section through the piston and air valve: Figure 4 a sectional plan
through the piston shewing the openings for the admission of air, and Figures 5
and 6 are views of the piston rings.
The apparatus is fixed in a recess formed in the floor close to the hinged jamb,
the top plate A being level with the floor and to the underside of the door I insert
and secure a lever, one end of which is fitted on the square portion B of spindle B¹.
To this spindle and to the casing C is secured a coiled spring D, and I connect the
two portions of the said spindle by a double crank arm E, to the pin of which is
mounted a piston rod and piston F, the latter being in the cylinder G which is
supported at the back end by the circular stud H. In the centre of the piston
is fitted a valve J, the collar J¹ at the end of the valve spindle being cut with a
number of grooves K for the admission of air to the underside of piston when the
door is opened, the spiral spring S bringing the valve to its face immediately the
piston ceases to travel towards the open end of the cylinder,
On opening the door, the spring D is coiled up close around the spindle B¹,
the double crank arm E drawing the piston towards the end of the cylinder, thereby
admitting air to the underside of the piston. On releasing the door the coiled
spring D forces the same towards the jamb, but the air in the cylinder being
compressed, prevents the door slamming: the coiled spring D continuing to act on
the door finally closes the same, the air from the cylinder escaping through a small
hole drilled in the cylinder at X,
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 coiled spring D combined with the piston fitted with a valve J, all arranged
substantially in the manner and for the purpose described and as illustrated by the
accompanying drawings.
D12:00 1