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Патент USA US3020057

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Feb. 6, 1962
Filed Aug. 17, 1959
ited Sttes
Ernst Karl Spieth, Schanbacherstr. 29, Esslingen
Hegensberg, Germany
Filed Aug. 17, 1959, Ser. No. 834,281
2 Claims.
(Cl. 273—105.6)
Patented Feb. 6, 1962
The present invention relates to a target conveying
device in general and to such device in particular, in
and the pulling cord 7 is guided over the driving roller
8 operatively connected with the electro-motor 9 and
over the guiding roller 10. The brake, for instance a
shoe-brake, which is co-ordinated to the driving roller
8, is not shown. The circuit openers 10, 11, 12 and 13 are
immovably mounted, the spring biased operating members
of which operate the switch. At the ends of the pulling
cord 7 rests the ends of swinging levers l6 and 17 which
may turn upon the bolts 14 and 15 and which may swing
which the carriage of the target moves, for instance, ‘along 10 by means "of the rollers 18 and 19, resting on the pulling
tracks formed by ‘two carrying cords and is pulled by a
cable 7. The remote control elements are disposed in
pulling cord by means of an electric motor, said pulling
the table 2, which may be a concrete block with a wood
cord running over rollers disposed at the shooting stand
covering, on which also the ‘carrying cords are mounted,
and at the target stand, and one of said roller-s being a
which carrying cords serve as conductors for the circuit
driving roller. One or two immovable circuit breakers 15 openers.
are disposed in the motor circuit and are responsive to
If the target 6 is moved in the direction of the arrow
abutment controls, the latter being obtained by oblique
A and approaches the shooting stand S, the end of the
running faces of the pulling cord.
pulling cord 7 disposed adjacent the shooting stand lifts
A device is known wherein the electric motor is started
the swinging lever 16 in a direction opposite to that of
manually and is switched off at the end of the running 20 the arrow D. The swinging lever 16 pushes the operat
stroke by switch ?ngers controlled by abutments.
ing member 11 of the circuit opener 10’ in upward di
It is further known to inject control pulses by having
the carriage run over ‘conducting and non‘conducting
portions of the tracks, respectively. If the carriage runs
on carrying cords, the latter must ‘be equipped with con
nections from conducting to non-conducting portions
rection, overcoming the pressure of the spring (not
shown) disposed therein, and opens the circuit for the
electric motor and at the same time causes a braking of
the driving roller "8, so that the target v6 arrives ‘fast at
a standstill.
It now the operator operates a reversal switch 28, the
Another device has also been proposed, in which switch
circuit is closed again, whereupon the target moves in ' .
ing cartridges for cut-out are provided on the pulling
the direction of the arrow B. If the target 6 approaches
cord, which cartridges are bendable and wherein the 30 the target stand, then the other end of the pulling cord
rollers for the cord support the switching cartridges when
7 raises the swinging lever 17 in the direction of the ar
the latter abut the abutment switches for the circuit.
row C, so that the operating member 13 of the circuit
Since the targets move fast and are to be stopped sud
opener 12 opens again the circuit and brings into opera
denly at the end of the stroke, the problem arises in
tion the braking device. The movement of the target
connection with the construction of the conveying devices 0O Cit 6 back to the shooting stand S is performed by manual
to reduce particularly the wear of those parts which cause
operation of a pushbutton reversal switch.
the opening of the circuit and the braking of the car~
Referring now to FIG. 1, screw bolts 20 are shown
which are movable in the longitudinal slots 21 of a carrier
It is, therefore, one object of the present invention to
23, which bolts 20 project also through a holder 22,
provide a target conveying device, in which the opening 40 which in turn carries the circuit openers 10' and 12,
of the circuit of the electric motor and, if necessary, the
respectively. It is quite apparent that upon loosening
start of the braking effect is brought about in such a
the nuts on the screw bolts‘20, a horizontal adjustment
manner that the circuit opener is operated by the pulling
of the circuit openers 10' and 12 may easily be per
cord itself which lifts or lowers the carriage, or moves
formed, either in the direction of the arrow A, or in the
the latter laterally and, in response to the length of the 45 direction of the arrow B. The carrying cords 1 may
moving stroke, changes the oblique run on face. By
this arrangement, the advantage is brought vabout that
the device does not need particular construction elements
serve as conductors for the electric current for the circuit
breakers by the use of insulating members disposed at the
' ends.
which consist of non~metallic, elastic insulating material
Referring now to FIG. 2, which discloses another em
and the ends of which are subjected to shearing or squeez 50 bodiment of the present invention, the adjustment is
ing during the run of the carriage thereover. In addi
brought about by means of an eccentric or cam 24 arranged
tion, the advantage is also achievedthat no parts of the
on the swinging lever 16' for the purpose to adjust the
fast moving carriage abut the control member of the
position of the operating member 11' relative to the
circuit opener, rather the pulling cord itself, which moves
slowly, provides the switching pulse.
With this and other objects in view, which will be
come apparent in the following detailed description, the
present invention will be clearly understood in connec
tion ‘with the accompanying drawing, in which:
FIGURE 1 is a side elevation of the present device;
FIG. 2 is a side elevation of an adjustment device for
the circuit opener; and
FIG. 3 is an essential part of the circuit diagram indi
cating the motor circuit with the abutment switches.
Referring now to the drawing, a running-track is
formed by two carrying cords 1 on which a carriage moves
in the direction of the arrow -A to the shooting stand S
or in the direction of the arrow B to the target stand Z.
pulling cord 7’, so that, thereby, an exact adjustment of
55 the braking and of the ?nal braking run of the target
may be achieved and the desirable standstill of the target
at the predetermined point is easily brought about. The
eccentric or cam 24 may be adjusted relative to the swing
ing lever 16' by means of the screw bolt 25 overcom
60 ing the force of the helical spring 26.
It now the target 6 moves in the direction of the ar
row A and approaches the shooting stand S, then the
end of the pulling cord 7’ adjacent the shooting stand
starts a lifting movement simultaneously lifting one end
of the swinging lever 16’ in the direction of the arrow B.
The eccentric 24 pushes the circuit opener 11' against the
' force of a spring (not shown) disposed therein in down
ward direction and opens the circuit of the electro-motor
9' and also releases the braking device for the driving
The carriage comprises a frame 3, carrying the wheels 70 roller 8', so that the target 6 may be brought to a stand
4 and the guide rollers 5, as well as the target 6. The
ends of the pulling cord 7 are secured to the frame 3,
still very fast.
Referring now to FIG. 3, a circuit diagram indicating
the connections is disclosed. It shows the electromotor
9, the circuit openers 10', ‘11, 12 and 13, the swinging
levers 16 and 17, and the switch 28, which is biased by
means of the spring 29. The switch 28 will be operated
to start the target. The housings 10' and 12 are of in
sulating material.
While I have disclosed two embodiments of the present
motor driving one of said rollers, abutment switches dis
posed in the electric circuit of said electric motor, two
swinging levers disposed in front of said target stand and
of said shooting stand, respectively, one end of one of
said swinging levers being pivotally secured to said target
stand and one end of the other of said swinging levers
being pivotally secured to said shooting stand, the other
end of said swinging levers resting on the top run of said
pulling cable, the end of said swinging levers resting on
the scope of the present invention being determined by 10 the upper run of said pulling cable ‘being lifted toward
invention, it is to be understood that these embodiments
are given by example only and not in a limiting sense,
the objects and the claims.
I claim:
engagement with said abutment switch during movement
of said carriage toward said respective stands, in order
to open said abutment switch and to stop the movement
1. In a target conveying device including a target stand
of said carriage, as said other end of said swinging levers
and a shooting stand disposed oppositely each other, a
carriage having wheels and guide rollers below and op 15 is raised during increase of inclination of said inclined
portions of said pulling cable.
posite said wheels, a target carried by said carriage, two
carrying cords supporting said carriage ‘by means of said
2. The target conveying device, as set forth in claim 1,
wheels of the latter during its movement on said cords,
which includes means for adjustment of said abutment
said two carrying cords {being disposed between said
switches in the direction of travel of said carriage.
target stand and said shooting stand, a pulling cable 20
secured to both ends of said carriage and forming an
References Cited in the ?le of this patent
upper run and a lower run, a roller mounted at said
target stand and at said shooting stand, respectively, said
rollers being disposed at a level below that of said carry
ing cords, said pulling cable running over said rollers
and forms inclined portions from said rollers towards
said carriage, caused by the difference of the height levels
of said carrying cords and of said rollers, an electric
Gridley ______________ __ Apr. 2, 1957
Switzerland __________ __ June 30, 1951
Germany ____________ __ Feb. 28, 1957
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