Improvements in Door Checks.
Year: 1888

page_text: Date of Application, 16th Aug., 1888
Complete Specification Left, 15th May, 1889-Accepted, 15th June, 1889
PROVISIONAL SPECIFICATION.
Improvements in Door Checks.
We FRANCIS ROBERT BAKER, Engineer, and MARIA FRIDA CECILIA BAKER, no
occupation both of 167 Pershore Road, Birmingham, Warwickshire do hereby declare
the nature of this invention to be as follows:-
This invention relates to the construction and arrangement of mechanism con-
stituting a door check, for obviating the sudden closing or slamming of doors, with
their attendant noise and shock to the structure.
Hitherto most if not all successful checks, have been constructed upon the
pneumatic principle, and it is with a view to improve upon such, that we have
inade these our improvements.
The doors are provided with any kind of closing spring, either separate from, or in
combination of construction with this our improved check.
Our invention consists primarily in providing that upon the closing of the door a
suitable bracketed projection upon the said door, shall first come in contact with a
light spring, attached to or acting upon a moveable buffer, or its equivalent, secured
to the door casing, too weak (or yielding) to suddenly remove the said buffer, and
therefore the momentum of the closing door is spent upon such buffer, and rebounds
therefrom more or less.
Upon the subsequent slower pressure of the projection upon the yielding spring
however, such spring has time to move the resisting buffer out of the way, and thus
allows its corresponding projection upon the bracket to pass, when the action of the
closing spring shuts the door quietly.
This moveable buffer may have a swinging, or pendulum, or sliding motion, and
further provided with an inclined surface or surfaces where necessary, to allow of the
return journey of the bracket projection or projections when the door is being opened.
Dated this 15th dow of Aroust 1888.
CHARLES T. POWELL,
12, Cherry Street, Birmingham, Applicants' Agent.
COMPLETE SPECIFICATION.
Improvements in Door Checks.
We FRANCIS ROBERT BAKER, Engineer, and MARIA FRIDA CECILIA BAKER, no
occupation, both of 167 Pershore Road Birmingham, Warwickshire 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 the construction and arrangement of mechanism con-
stituting a door check, for obviating the sudden closing or slamming of doors, with
their attendant noise and shock to the structure.
Hitherto most if not all successful checks have been constructed upon the pneumatic
principle, and it is with a view to improve upon such, that we have made these our
improvements.
The doors are provided with any suitable kind of closing spring.
Our invention consists primarily in providing that upon the closing of the door, a
suitable bracketed projection upon the said door, shall first come in contact with a
light spring, attached to or acting upon a moveable buffer or its equivalent, secured to
the door casing, too weak (or yielding), to suddenly remove the said buffer, and
therefore the momentum of the closing door is spent upon such buffer, and rebounds
therefrom more or less.

page_text: Upon the subsequent slower pressure of the projection upon the yielding spring
however, such spring has time to move the resisting buffer out of the way, and thus
allows its corresponding projection upon the bracket to pass, when the action of the
closing spring shuts the door quietly.
This moveable buffer may have a swinging, or pendulum, or sliding motion, and
further provided with an inclined, surface or surfaces where necessary, to allow of
the return journey of the, bracket projection or projections when the door is being
opened.
Having now described the nature of this our said invention, we will proceed
to more particularly describe and ascertain how it may be performed, having reference
to the accompanying illustrative sheets of drawings, upon which are figures and letters
of reference, and upon which similar letters refer throughout the several views to the
same thing or part, and in which :-
Fig. 1, is a front elevation in detail of the arrangement.
Fig. 2, is a plan view of Fig. 1.
Fig. 3, is a plan view shewing the position of the parts, when the closing door first
strikes the buffer bracket, &c.
Fig. 4, is a front elevation of the invention, after the rebound, when the yielding
spring is sufficiently strong to force back the buffer and allow the striking bracket
to pass.
Fig. 5, is a plan view of Fig. 4.
Fig. 6, shews in elevation upon a reduced scale, its position upon a door and door
lintel.
:
Fig. 7, is a detail plan view of the bracket upon the lintel.
Fig. 8, is a detail elevation of the bracket shown in Fig. 7.
Figs. 9, 10, & 11, are respectively, a front and side elevation and plan in detail of
the buffer or pendulum.
Figs. 12, & 13, are detail front and side elevations of the striking bracket.
Upon the door a, is a bracket b, having striking parts c & d.
Upon the door lintel or frame e, is provided a bracket f, having a bearing surface or
pin g. Upon this surface g, is carried the pendulum h, having at its front part an
indiarubber cushion or buffer i.
Also upon the front of. this. pendulum, provision is made to attach the yielding
spring, by means of the screw pin k.
Further upon the front of the bracket b, is formed a bevilled surface l, which, when
the door is closed, shall coincide or agree with a similar bevilled surface at m, upon
the rear of the pendulum h.
Thus the action of this our invention would be somewhat as follows:-
Upon the door being let free to close suddenly under the action of the spring, the
striking surface d, comes in contact with the spring j, a little in advance of the part c
striking the buffer i, but being comparatively weak, the said spring j, readily yields to
such a sudden blow, allowing the part c, to strike the cushion i, by which the door is
slightly rebounded, the door spring however continuing its closing. force minus its
momentum; the striking part d, pressing still in advance but now slowly, the spring),
is sufficiently strong to push the pendulum h, upon one side, as seen in Figs. 4 & 5,
allowing the part c, to pass thereby, and the part d, to ride round to the back, of the
spring j, as seen in Figs. 1, & 2.
Upon again opening the door, the bevilled surface 1, upon the bracket b, comes in
contact with the bevilled surface m, upon the pendulum as seen in Fig. 2, thus again
pushing the pendulum out of the way and permitting the former to pass, the part d,
also acting upon the spring j, in such a manner and position as to assist the said
pushing of the pendulum from the opening path of the part c.
In order to prevent the oscillation of the pendulum beyond the vertical line towards
the left hand, a stop peg n, is provided to fall against the lower extended portion o, of
the bracket f. see Figs. 1.4.589 & 10.

page_text: Having now particularly described and ascertained the nature of this our said
invention, and in what manner the same is to be performed, we declare that what
we claim is :-
1st. In a door closing check, the combination of a buffer pendulum h, carried
upon a bracket f, with a striking bracket b, substantially as shown and for the
purposes specifled.
2nd. In a door closing check, the combination of a buffer pendulum h, with a
yielding spring, substantially as set forth, and for the purposes specified.
3rd. The combination of the bevilled surface 1, upon the duplex bracket b, with
the bevilled surface m, upon the buffer pendulum h, substantially as set forth and for
the purposes specified.
4th. The general combination and arrangement of parts constituting a door closing
check, substantially as herein described and illustrated upon the drawings, that is to say;
The combination of the bracket f, buffer pendulum h, carrying the yielding spring j,
with the duplex striking bracket b, bevilled surfaces 1, & m."
Etu uay UI vidy
CHARLES T. POWELL,
12, Cherry Street, Birmingham, Applicants' Agent.