NOISELESS CLOSING & LOCKING DOOR APPARATUSES
Year: 1885

page_text: AUSTIN JOSEPH MAHER 104 Dorset Street upper Dublin Ireland Engineer do
hereby declare the nature of this invention for NOISELESS CLOSING & LOCKING
DOOR APPARATUSES to be as follows:-
Part one is termed a variable door check. It is made fast to the door or door
frame. Its principle is the adoption of the resistance offered by fluids when
attempted to be forced by pressure through a fixed opening at different velocities.
It differs essentially from Norton's or other forms of constant acting door Brake.
One form of the Apparatus is constructed as follows;—An Indianrubber, Collapsable
chamber is filled with a Liquid, this chamber has a small opening communicating
with another chamber more susceptible to expansion from pressure.
The said
communication may be fitted with a valve opening into the former chamber.
The first named chamber is fixed between plates resembling the ordinary V door
check spring, When the door is rappidly shut, or made to close up the plates the
maximum resistance of the Apparatus is offered by the expulsion of the Liquid
from N° 1 to N° 2 Chambers through the small opening, which opening is subject
to control.
When the door is slowly closed its minimum resistance is offered, and thus
perfect Locking and Closing is insured without shock or noise.
Part 2. Consists of the use of a vacuum chamber to accomplish closing without
noise. It is also made fast to the door, or door frame, this chamber is fitted with
a valve opening outwards, and has also a small hole in it.
It differs from Part 1. of this Invention, as its maximum resistance will be in
proportion to the Area of one side of the Chamber X by the Atmospheric pressure.
Both forms can be used in combination with Locks of doors.-Any form of self
closing appliances can be used.

page_text: AUSTIN JOSEPH MAHER 104 Dorset Street upper Dublin Ireland Engineer do
hereby declare the nature of this invention for IMPROVED DOOR CHECKS, and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
My Invention consits of Improvements in door Checks. The object of the said
Improvements and Principle is fully stated in my Provisional Specification, and
may be briefly stated to be,-to prevent Shock and Noise by doors closing to their
frames, and for doors swinging either way;-to arrest them at their required
position without rocking to and fro.
The principle to effect this object, is the well known Law of the resistance
offered by Liquids or fluids passing through a fixed opening at different velocities.
But I now proceed to descrite this Invention and two forms of the Apparatus by
the following dawings. Fig. I illustrates a sectional elevation of the first part
of the Invention A. B. C. D. Plates resembling an ordinary door Check Spring.
No 1. Collapsable Chamber filled with Liquid. E. communication with N° 2 chamber,
said chamber may be an ordinary receptacle, or capable of collapsing or expanding.
If an ordinary receptacle, it must be placed on a higher level than N° 1 Chamber
into which chamber the liquid will return by its gravitation when the door is
opened. F valve, G valve seat, H regulating screw to prevent the valve entirely
closing on its seat, and thus ensuring any required amount of resistance when
the plate C. D. is acted on by the closing of the door. A. B. portion to be made
fast to door or frame.
Fig. 2. is the vacuum form in sectional elevation, like figures denoting like
parts. No 1 vacuum Chamber, F, valve opening outwards and not inwards as
in fig. 1. H screw regulating the small opening in valve. X. X. staple com-
municating between plate C. D. and upperside of vacuum Chamber, point C.
may be a Joint, any suitable material may be used in the various portions of the
construction including indianrubber.
Having now set forth the Invention by written description and drawings let it
be clearly understood that I do not claim any continuous form of door Check such
as Norton's which is fast to the door and frame.
And first 1 Claim the application of the Principle illustrated when adopted as
a door or gate Check, whether applied to the door, frame, Lock, or Latch.
Secondly I claim the principle of the expulsion of a Liquid, or fluid, as set forth,
from one Chamber to another, through a regulated opening, whether the said
opening be fitted with a valve or not, and used for the purposes of a door Check.
Thirdly, I Claim, the principle of the vacuum form illustrated in fig. 2. the
maximum resistance offered to the closing of the door being equal to the Area
of the side of the vacuum Chamber X the athmospheric pressure.
December 9th 1885