Machine for Bending and Cutting Lock Springs.
Year: 1899

page_text: Date of Application, 16th Nov., 1899-Accepted, 20th Jan., 1900
COMPLETE SPECIFICATION.
Machine for Bending and Cutting Lock Springs.
I, PETER OLMESDAHL., of Nahmer Strasse B. 19, in the Town of Hohenlimburg,
in the Province of Westphalia and German Empire, 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:-
The present invention relates to machinery for bending and cutting springs for
locks. Hitherto lock springs have been manufactured by hand labour and the
price is accordingly relatively high, since one man cannot on an average turn
out more than 300 dozen daily. By the aid of my new machine, on the other hand,
several of which can be attended to by a single man, about 2000 dozen springs
can be bent and cut per diem.
The invention is illustrated on the accompanying drawing.
Fig. 1 shows a plan of the new machine, and
Fig. 2 a cross section of the same.
Fig. 3 is a detail view, drawn to a larger scale, of a spring manufactured by the
machine.
The steel band, in rolls, from which the springs are made, is fed forwards, each
time to the extent necessary for a single spring, by means of a feed device a, the
band being grasped by the lever arm 2, pivoted to the slide a, and the side of said
slide. Motion is imparted to the feed device by the arm 4, eccentrically secured
to the disc 3, mounted on the shaft 21. The band in this way is fed to the die 5,
where by means of a knife f worked by an eccentric 6 on the shaft 17, the
cut 8 (Fig. 3) is made. The band now ready cut in this manner passes to the
die 9, against which work three sliding stamps 10, 11 and 12. The stamp 10 is
driven by means of the eccentric 15 mounted on the shaft 17; the stamp 11 is
given a reciprocating motion by a cam on the same shaft operating the slide 19:
and the stamp 12 is given a like motion in similar manner by a cam 22 on the
shaft 21. The stamp 10 bends the side (Fig. 3) of the spring, cutting it off at
the same time; the stamp 11 bends the side of the spring; and finally the
stamp 12 bends the side z. The eve 20 is formed by a vin 13 (Fig. 2) provided at
one end of a double lever 14, the other end of which projects over a pin or lifter 16.
on the eccentric 15, which in rotating raises the lever and thus lowers the pin 13
and then allows it to rise. When the spring is complete, the stamns 10, 11 and 12
and the pin 13 retreat. The stamp 11 in its backward motion draws the spring
with it and allows it to drop into a receptacle beneath the machine. The shaft 17
is driven by the pulley 6 and transmits its motion by bevel gearing to the shaft 21.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
11
1. A machine for bending and cutting lock springs, comprising a knife (f)
operated by an eccentric (6) of a driving shaft (17) and cooperating die (5) for
making a cut in the material of the spring, a stamp (10) operated by said shaft

page_text: and cooperating die (9) for bending one side (r) of the spring and cutting off the
length, a pin (13) provided on a double armed lever (14) raised and lowered by a
pin (16) on said eccentric (15) in rotating for forming the eye (20) of the spring;
a stamp (11) operated by said shaft (17), cooperating with said die (9) for bending
the side (y) of the spring, and a stamp (12) operated by a shaft (21) lying at right
angles to and driven by said shaft (17) cooperating with said stamp (11) for
bending the side (z) of the spring, substantially as described.
2. A machine for bending and cutting lock springs, comprising a knife (f),
operated by an eccentric (6) of a driving shaft (17) and cooperating die (5) for
making a cut in the material of the spring, a stamp (10) operated by said shaft
and cooperating die (9) for bending one side (r) of the spring and cutting off the
length, a pin (13) provided on a double armed lever (14) raised and lowered by a
pin (16) on said eccentric (15) in rotating, for forming the eye (20) of the spring;
a stamp (11) operated by said shaft (17) cooperating with said die (9) for bending
the side (y) of the spring, and a stamp (12) operated by a shaft (21) lying at right
angles to and driven by said shaft (17) cooperating with said stamp (11) for
bending the side () of the spring, in combination with a device for feeding the
material between the said knife, stamps and dies, consisting of a slide (a), a
double armed lever (2) pivoted to said slide, one arm of said lever cooperating
with the wall of the slide (a) io grasp the material being fed, the other arm
being jointed to a rod (14), and a disc (3) mounted on said shaft (21) to which
the rod (14) is eccentrically secured, substantially as described.
Dated this 16th day of November 1899.
BOULT, WADE & KILBURN,
Agents for the Applicant.