Year: 1888

page_text: Date of Application, 23rd Jan., 1888
Complete Specification Left, 22nd Oct., 1888
Complete Specification Accepted, 23rd Nov., 1888
WILLIAM FREDERICK BURLEIGH 106 Camberwell New Road London D.E. Engineer
do hereby declare the nature of this invention to be as follows:-
My invention relates to the system of interlocking apparatus known as tappet
locking or Stevens & Sons system (Letters Patent for which were granted them
bearing date the 14th day of March 1870 No. 746).
The novel feature of my invention consists in retaining the full space between
tappets where it is desirable to use parallel apparatus, viz. where all the levers are not
in a line but are divided so that they form two or more rows of levers either placed
back to back or front to front as desired but the levers still requiring to interlock
with each other just the same as if the apparatus was in one length, consequently the
tappets attached to both rows of levers must enter the same guiding bar or locking
trough to give motion to locks & interlock with each other.
The ordinary way for doing this at present in use is to take the tappets attached
to both rows of levers into the guiding bar or locking trough at the same level thus
reducing the space between tappet and tappet and allowing very little room for..the
locks, this I overcome by fixing the tappets attached to both rows of levers in such a
manner that the tappets of one row come immediately over the tappets of the other
row thus retaining the full space for locks between tappet & tappet just as if the
apparatus had been in one length.
The tappets attached to both rows of levers are encased in the same guiding,bar or
locking trough which is made to receive a double row of locks, the locks required
to interlock only between top row of tappets or the locks required to interlock. only
between the bottom row of tappets not requiring to be made of a greater thickness
than the tappet but the locks required to interlock between the top & bottom row of
tappets being made thicker and in some cases shaped so that the bevel part of the lock
will enter a bevelled notch in the bottom tappet and not a top one and vice versa.
The top connecting slides between lock and lock run just above the top row, of
tappets and the bottom connecting slides between lock and lock run just beneath the

page_text: bottom tappets. In some cases I put a connecting slide between the top and bottom
tappets in which case the locks can all be of equal thickness but are rivetted or formed
on the top of the connecting slide to enter notches in the top tappet and are rivetted
or formed on the underside of the connecting slide to enter notches in the bottom
tappets.
It is obvious that this novel method of retaining the full centre to centre distance
of tappets or full space for locks between tappet and tappet in parallel locking
apparatus applies to any form of tappet locking no matter whether the tappets are
attached direct to the levers or actuated by the catch handle or otherwise.
Dated this 23rd day of January 1888.
COMPLETE SPECIFICATION
Improvements in Interlocking Apparatus for Railways.
WILLIAM FREDERICK BURLEIGH 106 Camberwell New Road London, S.E.
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:-
My invention relates to the system of interlocking Apparatus known as tappet
locking or Stevens & Sons system (Letters Patent for which were granted them
bearing date the 14th day of March 1870 No. 746).
The novel feature of my invention consists in retaining the full space between
tappets where it is desirable to use parallel Apparatus, viz. where all the levers are
not in a line but are divided so that they form two or more rows of levers either
placed back to back or front to front as desired but the levers still requiring to
interlock with each other just the same as if the Apparatus was in one length,
consequently the tappets attached to both rows of levers must enter the same guiding
bar or locking trough to give motion to locks and interlock with each other.
The ordinary way for doing this at present in use is to take the tappets attached
to both rows of levers into the guiding bar or locking trough at the same level thus
reducing the space between tappet and tappet and allowing very little room for the
locks, this I overcome by fixing the tappets a, a, a¹, a¹, attached to both rows of levers
in such a manner that the tappets of one row a, a come immediately over the tappets
of the other row a¹, a', thus retaining the full space b for locks between tappet and
tappet just as if the apparatus had been in one length.
The tappets a, a, a, a', attached to both rows of levers are encased in the same
guiding bar or locking trough c which is made to receive a double row of locks d, e,

page_text: the locks & required to interlock only between top row of tappets a, a, or the locks e
required to interlock only between the bottom row of tappets a', a¹, not requiring to
be made of a greater thickness than the tappet but the locks f required to interlock
between the top and bottom row of tappets being made thicker and in some cases
shaped so that the bevel part of the lock will enter a bevelled notch in the bottom.
tappet and not a top one and vice versa. The top connecting slides g between lock
and lock run just above the top row of tappets a, and the bottom connecting slides h
between lock and lock run just beneath the bottom tappets a¹. In some cases I put a con-
necting slide fig. 2 between the top and bottom tappets in which case the locks 1, 12
can all be of equal thickness but are rivetted or formed on the top of the connecting
slide k to enter notches in the top tappet a and are rivetted or formed on the under-
side of the connecting slide k to enter notches in the bottom tappets a¹. It is obvious that
this novel method of retaining the full centre to centre distance of tappets or full
space for locks between tappet and tappet in parallel locking apparatus applies to
any form of tappet locking no matter whether the tappets are attached direct to
the levers or actuated by the catch handle or otherwise.
Figs. 1 & 2 represent views of the guiding bars or locking troughs with covers
removed drawn in such a manner as to show tappets, locks & connecting slides.
Method of working tappets and locks are so well known as not to require
detailed description but reference can be made to prior patents No. 746-1870 and
No. 15820-1887.
Having now particularly described and 'ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is.
In parallel interlocking apparatus the method of arranging tappets (herein
lettered a. a¹) in guiding bar or locking trough substantially as described and for the
purpose specified.
1000