Year: 1886

page_text: I, HEINRICH SPÜHL of St Fiden, near St Gallen, Switzerland, 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 object of this invention is a machine for fastening down the extremities of
spiral metallic springs used in cushions, mattresses, etc so as to form at each end a
continuous ring, the said rings being at the same time bent into a plane perpen-
dicular to the axis of the spiral spring and the knotted extremity of the spring
lying towards the interior of the spring so as to avoid contact of the extremity
with the stuff and consequent damage to the latter.
The machine is represented in the accompanying drawings in which-
Fig. 1 is a side elevation, Fig. 2 a front elevation, Fig. 3 a plan-Fig. 4 detail
plan on an enlarged scale of the knotting contrivance and device for holding the
spring in the machine, Fig. 5 a pawl device for the axle c. Fig. 6 is in elevation
the device for clipping the wire of the spiral spring-Fig. 7-9 end elevation of
the revolving fastener in different positions. Fig. 10 plan view of the revolving
fastener.
The revolving fastener consists of a cylinder d¹ provided with a helical slot w
which extends to the axis of the cylinder and also a central recess 8, at one end of
the cylinder. This cylinder is firmly fixed to a tooth-wheel d and lodged in the sleeve
journal d formed in two corresponding parts (Fig. 4). The tooth wheel d and the
journal d' are also provided with slits corresponding to that in the revolving
fastener (Fig. 6) so as to allow the spiral spring to be laterally introduced
through these parts into the slot in the fastener.
On the journal d' (Figs. 4 and 6) close before the revolving fastener are situated
the clipping jaws f provided with two clamping faces f³f held apart by the
spring and serving to hold fast the extremity of the spring d' and coil of the
same next above.
The jaws ƒ³ are closed by the slit claw ƒ which slides against the inclined
planes of the jaws f³ and presses the same together.
On the opposite side of the sleeve journal d' is situated a second slit claw f",
which receives the wire in its said slit and gives the same an accurate guiding.
The claws f and f* are fixed on the vertical axles f, f, which gear with each other

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by toothed segments f1 f1. To one of these axles is fixed a crank lever e', which
is connected at e to the pedal lever e by means of a chain e³, guided over the
pulley e. The spring e secured to the frame near the journal arm o presses on the
crank e causes the claws f" and f* to turn backward.
In order to hold the end coil of the spring securely during the fastening, it is
pressed firmly on the plate k by means of the three clamps . This is effected by
the cam 65 situated on the shaft b, in the following manner. Under the cam b³
which revolves in the direction indicated by arrows is situated a vertical rod i
embracing the shaft b'in à longitudinal slot in its upper end and pivoted below to
a lever carrying a counterpoise and fulcrumed at 17. The lever is also con-
nected by a link with the rod k carrying a nut k² provided with hand-wheel k²
into which is screwed a spindle, fixed to the plate . To this plate k are fastened
three bolts to which are hinged the three clutches which when lifted are
allowed to fall outwardly on the guides ko, for the purpose of allowing the spiral
spring to be placed under. them.
Below the lever
(Fig. 2) and connected with the same by the clip i³ is arranged
the pressing lever, pivoted on the axle **:
On this pressing lever is fixed the spring which acts, when the rod i descends
on the pedal lever e
The apparatus is set in action through the pulleys a¹ a'. On this shaft is loosely
situated the driving wheel a² (Fig. 3) provided with coupling box a³. The
sweeping box a³ is pressed under easy pressure against the driving wheel a³.
When however extraordinary resistance arises in the mechanism the coupling
box a³ is automatically disengaged thereby from the driving wheel a³ which stops
so that damage of the tooth wheels or other parts of the machine is thus avoided.
The spur wheel a³ gears with the spur wheel b¹ mounted loosely on the cam
shaft band coupled thereby with the ratchet coupling box b
The ratchet
coupling box b² is governed by the lever m and spring n¹. The shaft 6 carries also
the spur wheel 63, which gears with the spur wheel c' on shaft c. On the latter is
also fixed the spur_wheel c* which, gears with the spur wheel d connected to the
revolving fastener d¹.
The pedal e serves for setting the machine in or out of action. This pedal has
its first fulcrum at e7 on the chain e³, and a second fulcrum in the slot g¹ embracing
the pivot g.
A counterpoise e¹ is fastened to the rear extremity.
This pedal e is connected by the link h, to the lever h¹ fixed to a shaft h which
also carries the lever h* governing the stop-pin h³ guided at h. This pin h³ holds
the coupling box 6 by means of the inclined plane 66 away from the spur wheel b¹.
In order to prevent the revolving fastener d' from turning too far and to cause the
slit in the same to register exactly with the slit in the journal sleeve d³, the cam
axle b carries also the cam or tumbler b' which governs the double pawl and
thereby the stop, disc c³ on the shaft ċ and with it also the spur wheel and the
fastener d (Fig. 5).
In order to allow the end coil and extremity of the spring to be firmly fixed
before the action of the fastening device commences the spur wheel. 63 is not pro-
vided with teeth along one third of its circumference. The cam 6 presses when
rotated on the friction roller 28 and moves the rod i downward,. which on the one
hand moves the forks f³ and f (through the spring and lever e) and thereby
clips the spring in the jaws f³ fs and on the other hand presses and holds the
lower coil of the spring against the plate by means of the clamps k through the
lever and rod k. When the rod i has reached its lowest point the spring is firmly
fixed and the fastening thereof now begins by the gearing of the teeth of the
wheel b into the wheel o¹ and this is effected by the time the last tooth of b³
disengages with the wheel c¹. The rod i then rises again, and the finished spring
freed from the clamps and jaws f³ f³ can be removed.
The working of the machine is as follows:-
The last coil and the extremity of the spiral spring are introduced through the
slit into the festanan Also that the complete il Bas

page_text: and the end of the spring lies in the groove w―the spring is then held temporarily
on the plate by sliding over the lower coil a aliding stop p (Fig. 4). The pedal e
being pressed down, turns firstly on the bolt and brings the forks f' and f' into
position (by means of the chain e³, lever et and tooth segments f¹ f¹). The forks f³
and f govern the jaws f f cause the extremity of the spring and that part of the
coil just above the said extremity to be clipped fast and secured. The point e
now becomes the fulcrum of the lever e and the latter lifted in the slit g¹ and dis-
engages thereby the rod h³ from the coupling box 63, so that the latter engages the
wheel b¹ and sets it in rotation. The cam 65 now comes into action in the above
described manner, the spring being pressed by means of the three clamps firmly
on the plate k and finally the revolving fastener d' is set in rotation and twists
the extremity of the spring round the coil next above as shown in Fig. 7 to 9.
After the fastening has been effected and the tooth wheel b³ is out of gear
with cl, the spring releases the pedal e. The rear part of the same descends in
the slit g and the disengaging pin h³ is thereby brought into engagement with the
coupling box 6 and arrives at the foot of the slanted plane, up which it rides thus
disengaging the wheel b¹ and setting the machine out of action.
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:-
In machines for fastening the ends of spiral springs to the coil next above so as
to form a continuous ring:
1. The rotary slit fastener & having a lateral slit extending from the circum-
ference to, the centre and also provided with a helical plane w and a central
recess 8, combined with the jaws f³ f³ for the purpose of twisting the end of the
spring round the coil next above and fixing it to the same.
2. The fastener d¹ and jaws f* f³ described in Claim 1, combined with fork ƒ³,
fork f and clamps adapted to be pressed down against the plate ³ substantially
as and for the purpose described.
3. The fastener d¹, jaws f³ fa and forks f' and f* combined with the pedal
lever e with fulcra g and e', chain e³, crank lever et, shafts ff and clutch disengaging
mechanism h h¹ h³ h³.
All arranged substantially as described and illustrated, and for the purposes
set forth.