Year: 1886

page_text: Date of Application, 31st May, 1886.
Complete Left, 26th Feb., 1887
Complete Accepted, 29th Mar., 1887.
I, JAMES HENRY JEFFERIES, of 26 Saint James's Square, Wolverhampton in the
County of Stafford, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to means whereby the attachment of what are known as
pneumatic door checks is greatly simplified, and also to means whereby, when such
description of check is employed, the door to which it is attached may be prevented
from closing beyond any desired position.
According to this invention, the door check is fixed on the side toward which the
door closes and so as to be in position parallel, or approximately so, with the plane of
the door when closed, and is simply hinged at its back end to a bracket on the inner
face of the door frame or case, and has the outer end of its piston-rod jointed direct to
an arm or bracket fixed to the face of the door.
This means of attachment is extremely simple, and obviates the unsightliness of the
guide rods and links frequently employed with this description of door check, and
the unsightly projection occasioned by fixing the check at right-angles, or approxi-
mately so, with the plane of the door as is sometimes done; and, moreover, by fixing
the check on the side of the door towards which it closes it is, of course, as a rule,
outside the room to which the door gives access, and in such case is very largely
prevented from being noticed by being back within the reveal or recess formed by the
door frame or casing. The check may, also, be fixed alternatively right or left handed,
as desired, without alteration of parts.
Holes are formed at intervals through the piston-rod, and the door may be prevented
from closing, beyond any desired position, by inserting a peg into one of the holes
through the piston-rod, as such hole is in position outside the cylinder of the door
check. This peg may, of course, be attached to any convenient part of the check or
door by means of a chain to prevent its being lost when not inserted within a hole.

page_text: COMI ELE DEPORTIVALIVA.
Improvements in or relating to Devices known as Pneumatic
Door Checks.
I, JAMES HENRY JEFFERIES, of 26 Saint James's Square, Wolverhampton in the
County of Stafford, engineer, 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, reference being had to the accompanying drawings
and the letters of reference marked thereon (that is to say) :-
This invention relates to means whereby the attachment of what are known as
pneumatic door checks is greatly simplified; to means whereby, when such description
of check is employed, the door to which it is attached may be prevented from closing
beyond any desired position; and also to an improvement in a special description of
combined piston and valve employed for a pneumatic door check.
According to this invention, the door check is fixed on the side towards which the
door closes, and, preferably, so as to be in position, or approximately so, with the plane
of the door when closed, and is simply hinged at its back end to a bracket on the
inner face of the door frame or case, and has the outer end of its piston-rod jointed
direct to an arm or bracket fixed to the face of the door. Holes are formed at
intervals through the piston rod, and the door may be prevented from closing, beyond
any desired position, by inserting a peg into one of the holes through the piston-rod
as such hole is in position outside the cylinder of the door check.
The invention will be readily understood on reference to the accompanying drawings,
of which figure 1 is a sectional plan taken on the centre line of a door check attached
to a door and casing, respectively, in the manner forming one of the features of
novelty of this invention; figure 2 is a view of the back or inner face of the piston.
The cover A. which closes in the inner or back end of the cylinder B is hinged direct,
by means of a lug C, to a bracket D fixed to the vertical soffit or inner face of the
door frame (or case) E, and a cap F on the outer end of the piston-rod G is pivoted
direct to an arm or bracket H fixed to the back face of the door E', that is, to the
face on the side towards which the door closes. The longitudinal axis of the door
check is shewn in the illustration to be parallel with the face of the door when the
door is closed, and such or approximately such position is preferred, but the longi-
tudinal axis may, obviously, be fixed at an angle with the face of the closed door,
if desired. A small peg (not shown, but the construction of which will be perfectly
obvious) is connected, for convenience of being readily to hand, by means of a chain
or cord, with an eye on the outer end of a stud a screwed into the front cover J or
cast therewith, and holes etc. are formed in the piston-rod G, and the door may
be prevented from closing beyond any desired position by simply inserting the peg
into one of the holes etc., at a time when such hole is in position forward of the
cover J, the hole into which the peg is inserted being, of course, that one which is in
position along the piston-rod G to meet the requirement of the case at the time. As

page_text: the piston-rod is pushed inwards, by the spiral spring within the cylinder 13 in the
usual way, the peg is stopped against the front of the cover J, or against a boss thereon,
and thus stops the inward movement of the piston-rod.
The above-described means of attachment is extremely simple, and obviates the
necessity and, consequently, the unsightliness of the guide rods and links frequently
employed with this description of door check, and the unsightly projection occasioned
by fixing the check at right angles, or approximately so, with the plane of the door as
is sometimes done; and moreover, by fixing the check on the side of the door towards
which it closes it is, of course, as a rule, outside the room to which the door gives
access, and is very largely prevented from being noticed by being back within the
reveal or recess formed by the door frame or casing. The check may, also, be fixed
alternatively right or left-handed, as desired, without alteration of parts. The above-
described means of preventing the door from being closed beyond any desired position
is, also, extremely simple, and convenient.
The arm or bracket H may be as short as may be desired, providing that the piston-
rod G is correspondingly lengthened so as to prevent the cover J from bearing against
the door.
No special construction of piston, or arrangement for the supply and discharge of
air to and from the cylinder of the door check is essential to be employed in com-
bination with above-described part of the invention, but the illustration shews a
convenient application therefor. Holes cc (or one only, or any number, as may be
desired) are formed through the body d of the piston, and through the cup-leather e,
and also through a sheet metal disc which bears against the back face of the flat
part g
of the cup-leather. The junk ring his formed with an annular sinking or
groove i at its front or bearing face, and securely holds in position between itself
and the disc a disc, washer, or valve k, of leather (preferably) or other suitable
substance capable of being expanded by pressure into the annular sinking i i.
Holes nn (or one only, or any number, as may be desired) are formed through the
disc, washer, or valve k, and through the junk ring h, in position to be well away
from the holes cc, preferably on the opposite side of the piston. An opening o is
formed in the cover J, and a pin having its shank slit and its head formed undercut
in section, as shewn, is screwed into a hole formed through the cover A. As a partial
vacuum is created behind the piston, resulting from the movement in opening the
door, air is forced in through the hole o and holes c c, and the valve k is expanded
into the groove ii and allows the air to travel round to the holes nn and thence to
the back of the piston; and as the piston is forced back by the spiral spring in closing
the door, the air is forced out through the slit in the pin and under the undercut
head of such pin, the valve & being, of course, closed against the disc by the pressure
of the air, thereby closing the holes c c against the return of the air. The outflow of
air is regulated by the degree to which the pin is screwed in. The disc f is not
essential, but is preferred as securely preventing the flat part g of the cup-leather
from being forced into the groove ii and so choking the holes n n.
The piston and valve described, but without the disc, have been heretofore used
for analogous purposes, and are therefore not claimed as part of this invention. The
disc f, however, is novel, and forms one of the features of this invention.
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 :-
1. The improved means according to which a device known as a pneumatic door
check is connected with a door and with a part to which the door is hung, substantially
as described, for the purposes set forth.
2. Applying a device known as a pneumatic door check at the side of a door toward
which such door closes, by hingeing the back end of such device direct to a bracket
or mounting rigidly fixed to the part to which the door is hung, and pivoting the
outer end of the piston-rod (preferably by means of a cap) direct to an arin or bracket
rigidly fixed to the door, substantially as described, for the purposes set forth.
3. The means whereby a device known as a pneumatic door check is fixed or

page_text: attached in place, substantially as described with reference to figure 1 of the drawings
herewith, for the purposes set forth.
4. The combination of the piston-rod G (preferably with a cap thereon) with the
arm or bracket H, and with the cover A hinged to the bracket D, substantially as, and
for the purposes set forth.
5. In a device known as a pneumatic door check, the means whereby the door to
which such device is applied is prevented from closing more than a desired distance,
substantially as described.
6. In a device known as a pneumatic door check the combination of the holes b b etc.
in the piston-rod G, with a peg for insertion into any one of such holes as may be
desired, substantially as, and for the purpose, set forth.
7. In a device known as a pneumatic door check, the disc f, substantially as and
for the purpose set forth.
Dated this Twenty-fourth day of February 1887.