IMPROVEMENTS IN LOOKS FOR RAILWAY CARRIAGES
Year: 1882

page_text: LETTERS PATENT to John Matthias Hart of the firm of Hobbs Hart and
Company of 76 Cheapside in the City of London for an invention of
PROVISIONAL SPECIFICATION left by the said John Matthias Hart at the
Office of the Commissioners of Patents on the 5th May 1882.
JOHN MATTHIAS HART of the firm of Hobbs Hart and Company of 70 Cheapside
in the City of London. "IMPROVEMENTS IN LOOKS FOR RAILWAY CARRIAGES."
My improvements have reference particularly to that description of Railway
carriage lock fastening described in the Specification of Letters Patent granted to
me bearing date the 12th of August 1870 No. 2249.
It is found in practice a great difficulty exists in insuring efficiency of working
in the locking means applied to the doors of railway carriages by reason of the
limited dimensions of the stiles of railway carriage doors.
It is however of the utmost importance in the manufacture of locks for railway
purposes to obtain increased security to such locks and ensure their correct working
as a means of preserving life.
The greatly increasing traffic on railways also demands every means of additional
security to maintain the correct locking of the doors.
For this purpose I propose to apply an additional spring to act on the trigger
lever, and by preference to apply that extra spring to act against the back of the.
trigger lever.
The spiral spring will then act as before, whilst the additional spring (a plate,
spring) will assist the spiral spring in its action thus securing increased strength of
holding and supplying a supplementary spring in case of accident.
These improvements also afford greatly increased facility for the use of internal
and external bandles to operate on the lock from either the inside or outside of
the door.
In place also of forming the operating part of the trigger lever with a sort
of V to operate in suitable recesses in the bolt, the operating part of the trigger
lever may simply act on square or other suitable surfaces formed on the bolt for
the purpose of holding that bolt in the position required for the time being.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Matthias Hart in the Great Seal Patent Office on the
2nd November 1882.
"
JOHN MATTHIAS HART of the firm of Hobbs Hart and Company of 76 Cheapside
in the City of London-" IMPROVEMENTS IN LOCKS FOR RAILWAY CARRIAGES
My improvements have reference particularly to that description of railway
carriage lock fastening described in the Specification of Letters Patent granted to
me bearing date the 12th of August 1870 No. 2249.
It is found in practice a great difficulty exists in insuring efficiency of working
in the locking means applied to the doors of railway carriages by reason of the
limited dimensions of the stiles of railway carriage doors.
It is however of the utmost importance in the manufacture of locks for railway
purposes to obtain increased security to such locks and ensure their correct working
as a means of preserving life.
The greatly increasing traffic on railways also demands every means of additional
security to maintain the correct locking of the doors.
For this purpose I propose to apply an additional spring to act on the trigger
lever and by preference to apply that extra spring to act against the back of the
trigger lever.
The spiral spring will then act as before whilst the additional spring (a plate
spring) will assist the spiral spring in its action thus securing increased strength of
holding and supplying a supplementary spring in case of accident.
These improvements also afford greatly increased facility for the use of internal
and external handles to operate on the lock from either the inside or outside of
the door.
In place also of forming the operating part of the trigger lever with a sort
of V to operate in suitable recesses in the bolt the operating part of the trigger
lever may simply act on square or other suitable surfaces formed on the bolt for
the purpose of holding that bolt in the position required for the time being.
But that the improvements may be the better understood I will by the aid of
the accompanying drawings proceed to describe the parts thereof
:

page_text: stated is highly important particularly when inside as well as outside handles are
provided for operating the lock as thereby the strain arising out of the increased
weight of the handles is greatly reduced.
This spring e is formed with horns or projections e¹. e' which pass into corre-
spondingly formed recesses in the two sides of the case of the lock and by which
the spring is held steadily and correctly in position for working-The form and
character of this spring as well as the method of applying it may however be
varied.
Having thus described my invention and an arrangement of parts adapted to
its use I would have it understood that what I claim is, the arranging or combining
parts of locks for railway carriages to render the same more efficient in use by the
application thereto of an additional spring to act on the lever c substantially as
described.
In witness whereof I the said John Matthias Hart have hereunto set my
hand and seal this Second day of November in the year One thousand
eight hundred and eighty two.
J. MATTHIAS HART (L.S.)