A New or Improved Device for Opening Locked Ventilation Doors in Mines without a Key in Cases of Emergency.
Year: 1898

page_text: Date of Application, 17th Oct., 1898
Complete Specification Left, 17th July, 1899-Accepted, 2nd Sept., 1599
PROVISIONAL SPECIFICATION.
A New or Improved Device for Opening Locked Ventilation Doors in
Mines without a Key in Cases of Emergency.
We, THOMAS GEORGE NOBLE, of Sacriston, in the County of Durham, Mining
Engineer, and GEORGE HERBERT ALLISON, of Campbell Terrace, Sunderland, in
the County of Durham, Engineer, do hereby declare the nature of this invention
to be as follows:
-
Our invention relates to means whereby in cases of emergency as of flood, fire
or an explosion the men can open and pass out through the doors in the air
courses, which are normally locked and the key held by some authorised person,
the men then entering and leaving by passages provided for them.
The locking device consists of a screw bolt through the door and frame which
is screwed from the outside by a key by the authorised person into a nut, form-
ing part of the unlocking device, and the door and frame are thus made practi-
cally air tight.
The unlocking in cases of emergency is effected by a pair of clamping levers,
preferably of the 2nd order, on separate fulcrums on each of which levers is
formed one half of the tapped nut for the screw bolt. Normally these levers are
closed and secured by a double ended slotted lever with a handle but in an
emergency, this lever can be turned partially round and, by the action of the
inclined slots, separates the two levers on their fulcrums and opens the tapped
nut so that the screw bolt is released from it and the door can then be pushed
open from the inside so that the men can pass out.
D1 17.0 1717
Ontario1800
T. J. DANSON,
Chartered Patent Agent, Agent for Applicants
A New or Improved Device for Opening Locked Ventilation Doors in
Mines without a Key in Cases of Emergency.
We, THOMAS GEORGE NOBLE, of Sacriston, in the County of Durham, Mining
Engineer, and GEORGE HERBERT ALLISON, of Campbell Terrace, Sunderland, in
the County of Durham, Engineer, do hereby declare the nature of said inven-
tion and in what manner the same is to be performed to be particularly described
and ascertained in and by the following statement:-
Our invention relates to means whereby, in cases of emergency, as of flood,
fire, or an explosion, the men can open and pass out through the doors in the

page_text: air courses, which are normally locked, and the key held by some authorised
person, the men then entering and leaving by passages provided for them.
The locking device consists of a screw bolt through the door and frame which
is screwed from the outside by a key by the authorised person, into a nut form-
ing part of the unlocking device, and this door and frame are thus made practi-
cally air-tight..
The unlocking in cases of emergency is effected by a pair of clamping levers,
preferably of the 2nd order, on separate fulcrums, on each of which levers is
formed one half of the tapped nut for the screw bolt. Normally these levers
are closed and secured by a double ended slotted lever with a handle, but in
an emergency, this lever can be turned partially round, and, by the action of the
inclined slots, separates the two levers on their fulcrums and opens the tapped
.nut, so that the screw bolt is released, and the door can then be opened upon
its hinges, so that the men can pass out.
DESCRIPTION OF DRAWINGS.
Fig. 1 shews a face view of the locking device in locked position, as it will
normally be until unlocked by the authorised person by unscrewing the bolt
with a key. Fig. 2 shews a face view unlocked in case of emergency by the
men who are thus enabled to escape through the separation doors, normally closed
and locked; and Fig. 3 is a section on the line - of Fig. 1. The figs. are all
full size.
A is the door frame fixed in the air passage, B the door fitting air tight
thereon and opening on hinges. C is a bolt with a collar C' on one end, and
screwed at the other end through a tapped nut D D' formed in two halves upon
the ends of two levers E E' fulcrumed at F F on a plate G, secured on the
frame A. Upon these two levers are studs H H which work in eccentric slots J J¹
in a plate K, revolving on a stud L in the plate G, by a handle K', the eccentri-
city of the slots J J opening the levers E E¹ from the screw threads of the
bolt C, so as to release the bolt as shewn on Fig. 3, the bolt then being driven
through the door and frame, as shewn in dotted lines on Fig. 3, the door can be
opened.
The operating mechanism may be modified as to the details, the essential
features being that a tapped nut, formed in halves upon the ends of two levers,
working upon fixed fulcrums, may be caused by eccentric slots to close upon the
threads of a locking bolt, and thereby lock the mechanism against the door
being opened, or may, by the reverse action, open the half nuts on the levers
clear of the locking bolt, so that the bolt can be displaced and the door opened in
case of emergency.
Having now particularly described and ascertained the nature of said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is:
-
The device or mechanism for opening locked ventilation doors in mines, with-
out the master key, in cases of emergency, comprising a screwed locking bolt
embraced by a tapped nut, formed in halves on two fulcrumed levers, which can
be operated so as to separate the halves of the nut and set free the locking bolt,
and allow the door to be opened, or, by the reverse operation, close upon the
locking bolt, and secure the door locked; substantially as described and in one
form of construction shewn, or any mere modification of the essential mechanism.
·
C
1
1000
T. J. DANSON, F. C. Inst. P.A.,
Agent for Applicants, Newcastle-upon-Tyne.