A CHAIN BELT FASTENED BY A LOCK OF A PECULIAR NEW CONSTRUCTION, WHEREBY ALL TRUNKS ARE NOT ONLY EFFECTUALLY SECURED FROM BEING CUT AWAY FROM CARRIAGES, BUT THE LOCK ITSELF SUCH AS CANNOT BE PICKED
Year: 1778

page_text: MARTIN'S SPECIFICATION,
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOSHUA
LOVER MARTIN, of Fleet Street, in the City of London, Optician, send
greeting.
WHEREAS His most Excellent Majesty King George the Third did, by
His Letters Patent under the Great Seal of Great Britain, bearing date the
Twenty-ninth day of May, in the eighteenth year of His reign, give and grant
unto me, the said Joshua Lover Martin, His especial licence that I, the said
Joshua Lover Martin, during the term of years therein expressed, should. and
lawfully might use, exercise, and vend, within England, Wales, and Town of
Berwick-upon-Tweed, my Invention of "A CHAIN BELT FASTENED BY A LOCK OF
A PECULIAR NEW CONSTRUCTION, WHEREBY ALL TRUNKS ARE NOT ONLY EFFECTUALLY
SECURED FROM BEING CUT AWAY FROM CARRIAGES, BUT THE LOCK ITSELF SUCH AS
CANNOT BE PICKED;" in which said Letters Patent there is contained a provisoe
obliging me, the said Joshua Lover Martin, under my hand and seal, to
cause a particular description of the nature of my said Invention, and how
the same is to be performed, to be inrolled in His Majesty's High Court
of Chancery within four calendar months after the date of the said recited
Letters Patent, as in and by the same (relation being thereunto had) may
more fully and at large appear.
NOW KNOW YE, that in compliance with the said provisoe, I, the said
Joshua Lover Martin, do hereby declare that my said Invention of a Chain
Belt fastened by a Lock of a Peculiar New Construction, whereby all Trunks
are not only effectually secured from being Cut away from Carriages, but the

page_text: J. L. MARTIN. (L.S.)
AND BE IT REMEMBRED, that on the same Fourteenth day of
September, in the year above mentioned, the aforesaid Joshua Lover Martin
came before our said Lord the King in His Chancery aforesaid, and
acknowledged the Specification above mentioned, and all and every thing
therein contained and specified, in form above written, together with the
Plan thereof thereunto annexed. And also the Specification aforesaid was
stampt according to the tenor of the Statute made in the sixth year of the
reign of the late King and Queen William and Mary of England, and so
forth.

page_text: y a exant Chain may be found necessary.
Fig: 1 Represents the Flatt Chain uncovered. It consists of a certain number of Links, of an oblong square figure made of Iron
-other Mettal - These Links, are or may be, joined together with plate Fron, Copper, Brass, Tin. &ege_
The Links may be manufactored of any form or figure required.
or,
on any
manner.
Fig: 2. Is the flat chain, covered with leather and has every appearance of a common.
fastened together or made secure
strong Belt, the ends of which are
by a Lock of an Ip & New Construction and explaind in the following m
Fig. 3. Is a view of the Lock, with the upper plate, off the Eetter to exhibit an imediate and just appearance of the several
parts which are totally new, but are more, fully represented and distinctly seen in fig ! 4. each new part being lettered (viz
a. BCDEFG.h.
the new parts.
Ve
Fig: 4. Is likewise a view of the said Lock without any Wards, in order more ready to describe the action and situation of all
A and B are two Main Springs which are,
e fastened behind the plate (on which all the work, wards
are made fast) and each Spring is fixt fast by a Screw and steady Pin. The spring A has on its end a part which projects
thro' the plate (before mentioned) and lays close under the main Boult, and takes place of the Tumbler in common Locks .- On
the Spring B is fix'd also a peice which comes thro' the plate and lays close to the outside Ward, and is flush, or even with the top
of the Ward (a part of the ward) being cut away to admitt of it, as seen in
in Fig: 3. This piece at B, has a notch, in which enters the
branch C. and by which means B is prevented from being push'd down (in order to get at the main Boult / unless, relieved by
the key acting against that part of the branch C mark'd D. The other end of the branch C is curv'd in order that the Key may
discharge C from B, in turning the Key from right to left. Close under the Ward at E, is a conical upright peice, fasterid on the
spring A, and is exactly the height of the under part of the outermost Ward, and is seen only in Fig: 4 and markd F. Gis likewise
a piece of the same Conical upright form, and is fixa fast on the spring B. His a back spring to the branch C, and continually
acting against it, to prevent by any accident C quitting B unless by the key.
2
The action of the Key, upon the several new parts in locking and unlocking, is as follows. The key being introduced, the first of
the new parts which come in contact with it, is at D where it enters a certain part of the Key at i Fig: 5 which forces the branch C to
quit B and at that instant the key at hi¸ in its progressive motion coming upon the conical part G depresses B sufficiently low
to admit a free passage for the key which instantly comeing on the other conical,
nob on the end of the spring. A and consequently admits of the key throwing back the main Boult. This last description, respects the
6 peice Bat that part of the key depresses likewise the
unlocking. In the case.
of locking when the key is moved from Right to Left the first part of the new works that comes in contact with
he key will of course be at the end of the branch C. The new parts ABCDEFGH as above described are applycable to Locks of
all kinds and for all uses (viz :) for Gates, Street doors, Cupboards, Draws, Boxes & fc and in every instance where a Lock
I safety is required.