AN IMPROVED FASTENING FOR NECKLACES AND BRACELETS
Year: 1883

page_text: LETTERS PATENT to Friedrich Hermann Felix Engel Civil Engineer and
Patent Agent in the city of Hamburg Germany, for an Invention of "AN
IMPROVED FASTENING FOR NECKLACES AND BRACELETS" a communication to
me by Ernst Hamann [sic] of Hamburg in the German Empire
PROVISIONAL SPECIFICATION left by the said Friedrich Hermann Felix
Engel at the Office of the Commissioners of Patents on the 24th September
1883.
FRIEDRICH HERMANN FELIX ENGEL Civil Engineer and Patent Agent in the
City of Hamburg. Germany "AN IMPROVED FASTENING FOR NECKLACES AND
BRACELETS," a communication to me by Ernst Harmann of Hamburg in the
German Empire.
This invention relates to clasps or locks or fastenings for necklaces, neck chains,
bracelets, and other chains of jewellery, and has for its object to improve the
construction of such clasps or fastenings, to increase the safety against involuntary
opening, and to produce locks more elegant in appearance, than those formerly in
use.
The lock or fastening consists of two parts each of which is at one of its ends,
attached to one of the free ends of the chain necklace or bracelet or other article.
The one part of the fastening is formed of a cylindrical, square, or other shaped
tube furnished with a bottom plate, closing the end attached to the chain necklace
or other article, whilst the other end is open. To the inner side of the before
mentioned bottom-plate is attached one end of a spiral spring placed inside, and
extending upward about one half of the full length of the hollow tube. The open
end of the tube is furnished with a bayonet-shaped or curved slot, terminating at
its lower end in a returning short groove or recess.
The other part of the fastening is formed of a hollow or solid body fitting into
the opening of the tube containing the spiral spring.

page_text: This part, as before mentioned, with its one end attached to the other end of the
chain necklace or other article is furnished at its outer circumference with a
projecting pin or other projection so fitted as to be capable of sliding in the groove
or slot of the hollow open part.
In operation the body is introduced into the open part, of the second portion of 5
the fastening and the spiral spring is compressed inside the cylinder correspondingly
and after passing the first slotted portion of the socket the stud or pin will meet
the second opening or slot, and then by the incline or turn will slide forward and
downward, and then reach the second return slot into which it will be carried by
the spring action of the body spring and will there be securely held until by a 1
direct mechanical operation the unfastening is to be effected.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Friedrich Hermann Felix Engel in the Patent Office on the
24th March 1884.
FRIEDRICH HERMANN FELIX ENGEL Civil Engineer and Patent Agent in the
city of Hamburg Germany AN IMPROVED FASTENING FOR NECKLACES AND
BRACELETS a communication to me by Ernst Hamann [sic] of Hamburg in the
German Empire
"
This invention relates to clasps, or locks, or fastenings, for necklaces, neckchains,
bracelets, and other chains of jewellery, and has for its object to improve the
construction of such clasps, or fastenings, to increase the safety against involuntary
opening, and to produce locks more elegant in appearance than those formerly in
use,
The lock or fastening consists of two parts, each of which is at one of its ends
attached to one of the free ends of the chain, necklace, bracelet, or other article.
The one part of the fastening is formed of a cylindrical square, or other shaped
tube furnished with a bottom-plate closing the end attached to the chain, neck-lace,
or other article, whilst the other end is open. To the inner side of the before
mentioned bottom-plate is attached one end of a spiral spring placed inside and
extending upward about one half of the full length of the hollow tube. The open
end of the tube is furnished with a bayonet shaped or curved slot terminating at
its lower end in a returning short groove or recess.
The other part of the fastening is formed of a hollow or solid body fitting into
the opening of the tube containing the spiral spring.
This part as before mentioned with its one end attached to the other end of the
chain, neck-lace, or other article is furnished at its outer circumference with a
projecting pin or other projection so fitted as to be capable of sliding in the groove
or slot of the hollow open part.
In operation the body is introduced into the open part of the second portion of
the fastening and the spiral spring is compressed inside the cylinder correspondingly
and after passing the first slotted portion of the socket the stud or pin will meet
the second opening or slot and then by the incline on turn will slide downward
and forward and then reach the second return slot into which it will be carried by
the spring action of the body spring and will there be securely held until by a
direct mechanical operation the unfastening is to be effected.
This invention is illustrated by the accompanying sheet of drawings wherein
Fig. 1 represents the fastening in open state in connection with the ends of a chain.
Fig: 2 represents on enlarged scale the fastening unlocked. Fig 3 the same
when locked. Fig 4 is a longitudinal section of the fastening in locked state and
Fig. 5 shows a modification in which a curved instead of a bayonet shaped slot is
employed for keeping the fastening in locked state.
a designates the tube or case that may be of circular, square, or otherwise shaped
section containing spring m, b designates the body part to fit the tube; e is a pin
attached to body b and 8 the bayonet shaped or curved slot before described.
When locked spring m is compressed as will be seen from Figs. 3, 4 and 5 of the
drawings but when unlocked the spring m expands as shown by Fig 2 of the
drawings.
Having now described the nature and particulars of the said invention I claim
The fastening for necklaces, bracelets, chains and such like objects composed of
the two parts a and b (the outer ends of which are put in connection with the free

page_text: ends of the neck lace bracelet, chain or other object) whereof the part a contains a
spring m or other elastic medium at its bottom end and slots s at its top end
whilst part b is furnished with the locking pin e as herein described and shown by
the drawings
In witness whereof I the said Friedrich Hermann Felix Engel have hereunto set 5
my hand and seal this twenty first day of March in the year of our Lord one
thousand eight hundred and eighty four.
F. H. F. ENGEL. (LS)