Improvements in Spring Hinges.
Year: 1888

page_text: Improvements in Spring Hinges.
1, LORENZ BOMMER, of Brooklyn, in the County of Kings, and State of Now York,
United States of America, Manufacturer, 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 :-
This Invention relates to improvements in single and double spring hinges.
The Invention consists of a spring hinge, the leaves of which are provided with
perforated cars bent up at right angles to, and made integral with, the body of said
leaves, said ears being connected by a stop flange which extends from ear to ear. The
barrel or barrels of the spring-hinge are made of sheet metal and provided at the
abutting ends with outwardly-bent extension plates, which in single spring hinges are
rivetted to each other and forin one leaf of the same while in double spring hinges
they are rivetted to the over-lapping plates of the second barrel so as to form the
connecting plate of the double hinge.
The Invention consists further of a leaf having perforated ears bent at right angles
to the leaf, pintle-sockets provided with pins which engage holes of said ears, washers
between the pintle-sockets and the spring sockets and barrels, and a pintle connecting
said pintle-sockets and being attached thereto.
In the accompanying drawings, figure 1 represents a side elevation of a double
spring-hinge, partly in section; figure 2 is a horizontal section of the same, on
line xx, figure 1; and figure 3 is also a horizontal section on line y y, figure 1,
shewing the hinge folded up.
Similar letters of reference indicate corresponding parts in the three figures.
A, A', are the spring barrels, A3, the connecting web of a double spring hinge,
and B, C, the outer leaves which are respectively attached to the door frame and

page_text: door and which are made of wrought iron, sheet steel, or other sheet metal of suitable
thickness. The leaves B, C, may be provided at their upper and lower edges with
flanges aa which serve as gauges for determining the depth to which the leaves have
to be set into the wood, and with centrally-perforated disc-shaped ears dd, which are
mado integral with the leaves B, C, like the flanges, and bent up at right angles to
the leaves. An auxiliary stop flange b extends longitudinally along the inner edge
of each leaf, and is also made integral therewith, said flange imparting greater
strength to the leaf and forming the connection between the body of the leaf and the
ears dd, as well as a convenient rest for the stop-pin 6' of the spring socket of the
spring, as shewn in figure 1.
The spring barrels A A' are made of sheet metal and provided at their abutting
ends with extension plates which overlap each other and which are rivetted or other-
wise fastened together so as to form a connecting web A² of four layers of sheet
metal which possesses greater strength and durability than the cast metal connecting
plates heretofore in use. In single spring hinges, the extension plates of the spring
barrel are rivetted together and form one of the leaves of the hinge.
Between the perforated cars d d of the leaves B, C, and the spring sockets at one
end of the barrels and the barrels at the other end, are interposed disc shaped
washers, that take up the friction of the cars with the spring sockets and spring
barrels respectively without weakening or reducing the thickness of the perforated
cars dd by wear. The pintle-sockets D are connected by pins to registering
holes of the ears d and washers d', the pintle sockets being rigidly connected
thereto and to the spring barrel by the pintle E which is rivetted to said pintle
sockets by enlarging the ends, or by other suitable means, so as to prevent the moving
up or down of the pintle. The ends or shanks of the pintle sockets D are scrow-
threaded for applying thereto detachable screw caps F, of plain or ornamental shape.
The arrangement of the spring barrel and of the spiral spring in the same, and the
operation of the spring hinge, is the same as in the well known spring hinges here-
tofore in use; as the essential features of novelty of the present spring-hinge are the
perforated disc-shaped ears bent up at right angles to the leaves and integral
therewith, the longitudinal stop flange extending between the ears, the construction
of the connecting web, plate, or leaf, of the hinge in connection with the spring
barrel, and the connection of the leaves with the pins of the pintle-sockets, by means
of the perforated ears and the intermediate perforated washers.
The advantages of the improved spring hinge are, that it can be made lighter,"
cheaper, and stronger, and that a longer and stronger spring can be inserted into the
barrel, as the same is nearly equal in length with the leaves, and exerts thereby a
greater spring power on the same.
Having now particularly described and ascertained the nature of the said invention,
and in what manner the same is to be performed, I declare that what I claim is :-
1. In a spring hinge, a leaf having perforated disc shaped ears bent up at right
angles to, and integral with, the body of said leaf, and a longitudinal stop flange.
extending along the inner edge of the body of the leaf from one ear to the other,
substantially as set forth.
2. In a spring hinge, a sheet metal barrel for enclosing the spring, said barrel being
provided at its abutting ends with outwardly bent and rivetted extension plates,
substantially as set forth.
3. In a double spring hinge, the sheet metal barrels enclosing the springs, said
barrels having extension plates bent outwardly at their abutting ends the extension
plates overlapping each other and being fastened together so as to form the connecting
web or plate of the hinge, substantially as set forth.
4. In a spring hinge, the combination of a spring barrel, a leaf having perforated
pintle ears, pintle sockets connected with said cars, and a pintle which is attached to
the pintle sockets, substantially as set forth.

page_text: 5. In a spring hinge, the combination of a spring barrel, a leaf having perforated
pintle cars, pintle sockets connected with said cars and having threaded shanks,
a pintle attached to said pintle sockets, and screw caps applied to the shanks of the
pintle sockets, substantially as set forthi.
6. In a spring hinge, the combination of a spring barrel, a leaf having perforated
pintle cars, pintle sockets having pins which engage holes of said ears, washers
interposed between the pintle sockets, and spring sockets of the barrel, and a pintle
attached to said pintle sockets, substantially as set forth.