US1337842A - Closing device for the material-receptacles of automatic weighingmachines - Google Patents

Description

J. LAMBERTZ.

CLOSING DEVICE FOR THE MATERIAL RECEPTACLES OF AUTOMATIC WEIGHING MACHINES.

APPLICATION FILED NOV. 10. 1917.

1,337,842. Patented Apr. 20, 1920.

2 UN TED STATFE ATN FFICE.

JOSEF LAMBERTZ, OF HENNEF-SN-TETESIEG, GERMANY.

CLOSING DEVICE FOR THE MATERIAL-REGEPTAOLES OF AUTOMATIC WEIGHING- MACHINES.

Application filed November 10, 1917.

To all whom it may concern:

Be it known that I, J osnr Linxrnnn'rz, a subject of the German Emperor, residing at Hennef on the Sieg, Germany, have invented certain new and useful Improvements in Closing Devices for the Material Receptacles oi Automatic Weighing-Machines, of which the following is a speclfication.

The present invention refers to a closing device for the material receptacle of automatic Weighing machines, in which there is a catch and a lever for holding the balance beam on the emptying of the receptacle. in weighing machines of this description it IS diificult to provide for a proper seal or closure of the material receptacle to such an extent that therecan be no loss or leakage of the material during the weighing operation, if this material is ofa powdery nature. According to the present invention the bottom of the receptacle being formed by a hinged flap is closed in the lowest position of the receptacle by a releasable lever, comprising a cam, which is so shaped that it presses the bottom flap in its closing position against the rim of the opening perfectly tight. The device is so constructed that the catch lever mentioned above can release the In the construction shown in Figs. 1 to 3 the catch lever a is constructed in the known manner, in which the upper arm carries an antifriction roller 5 designed to press against a prolongation c of the receptacle rod (Z. On the receptacle 7'' a closing lever g is rotatably attached having on its lower part a cam h, which is so shaped that it can press the flap z' in its closing position against the rim of the opening of the receptacle The upper end of the lever g is Specification of Letters Patent.

Patented Apr. 20, 1920. Serial No. 201,297.

connected by a toggle joint m to a stud 70 on the receptacle 7'', adapted to be held in stretched position by a pin a also attached to the outer wall of the receptacle. That part or arm of the toggle oint, which is next to the stud 7c, is provided with a second 0 about at ri ht angles. XV hen the receptacle is to be emptied, a stud p 011 the catch lever a strikes against the arm 0, when on the receptacle being filled the catch lever is released from the pawl 9. Normally the pawl 9 holds the lever a by engaging a pin r until this lever is oscillated by a stud 5 attached to the carrying rods 8 of the weight pan t, when the beam 14 oscillates to a sufiicient extent after the receptacle 7' is filled. This operation taking place, the catch lever a is moved from the position shown in Fig. 1 into the position shown in-Fig. 2, by which movement in the usual manner the How of the material into the receptacleis interrupted and the toggle joint is allowed to collapse, as shown in Fig. 2 and the cam it releases the bottom fiap i. The material in the receptacle opens the flap i by its own weight.

The flap i is provided beyond its hinge with a weighted prolongation carrying a pin 00, which projects into a slot 10 of a rod 10 attached to a weighted lever 41. This lever is fulcrumed on the outer wall of the receptacle in such position and it is of such length that, when the flap 2' is opened and thus the pin :0 is moved upward in the slot 10 of the rod 10 the weighted lever 11 is enabled to oscillate from the position shown in Fig. 1 into the position shown in Fig. 2 catching hold of the catch lever a, which by the roller Z) in known manner holds the receptacle 7 in its lowest position. When the receptacle is emptied, so that no more material rests on the flap 2', the latter is closed by its counter weight in known manner. In doing so, its stud 0a strikes against the lower end wall of the slot to and the rod w draws the weighted lever u back into the position shown in Fig. 1 out of the way of the lever a. Consequently the lever 04 loses its hold and the closing lever 9 can be brought into the position shown in Fig. 1 by a counter weight y attached to a small arm y" of the lever g. The cam it thus catches hold of the bottom flap i and presses it against the rim of the opening of the receptacle. Thereupon the catch lever a also returns into the position shown 111 Fig. 1 by known means and will be caught by the pawl Q, so that a new weighing operation may again be started.

To prolong the time, in which the receptacle is held in lowest position and to allow the upward movement not to take place until the last moment shortly before the closure of the receptacle, the holding lever '0 can be provided with an upwardly extending arm Q21, Fig. 3, preferably about 90 and this arm will hold the catch lever a for a short time, even though the stud w has engaged the end of the slot w.

In the modification shown in Figs. i and 5 the catch lever a has a somewhat different shape. It is rotatably attached to the framing of the machine considerably lower and is provided with a horizontal arm (1 which is adapted to be engaged by a projection .2 attached to the flap i when the latter closes. In the lowest position of the material receptacle f the catch lever a catches hold of a pin 0 attached to the receptacle 7, the lever a having a pawl shaped arm Z2 for this purpose, so that also in this case the receptacle is held in its lowest position when being emptied. The release of the closing de vice in this case is brought about by a projection 39 attached to the frame of the machine and which strikes the toggle joint on, so as to collapse it, Fig. 5.

Instead of providing the lever g with a counter weight g as described with reference to Figs. 1 and 2, the lever y can be provided with an inwardly directed arm 3 which is struck by a projection 1 on the bottom flap, when the latter is closed.

From the above it will be understood that the emptying of the receptacle takes place as soon as the toggle joint m knocks against the projection p lVhen the receptacle is empty and the flap 2' no more weighted by any material, it closes under the action of its counter weight 3, the projection z striking against the arm a of the lever a and withdraws the latter from the pin 0 whereupon the receptacle ean be moved upward. Shortly after the projection a has engaged the arm a also the projection strikes against the arm g thus causing the cam 72 of the lever g to catch hold of the bottom.

I claim:

1. In an automatic weighing machine, a weighing receptacle, a hinged flap for closing the bottom thereof, a lever having a cam adapted to engage the flap to keep the latter in closed position, and means to release the cam on the downward movement of the weighing receptacle when filled.

2. In an automatic weighing machine, a weighing receptacle, a hinged flap for clos ing the bottom thereof, a lever having a cam adapted to press against the edge of the flap to keep the latter in closed position, a toggle joint normally holding the said lever with its cam in closing position when stretched, and means adapted to collapse the toggle on the downward movement of the receptacle to release the cam.

3. In an automatic weighing machine, a weighing receptacle, a hinged flap for closing the bottom thereof, a lever having a cam adapted to press against the edge of the flap from below to keep the latter in closed position, a toggle joint normally holding the said lever with its cam in closing position when stretched, means to collapse the toggle on the downward movement of the receptacle, and a catch lever fulcrumed on the framing of the machine and adapted to hold the receptacle in its lowest position until the latter is empty.

4. In an automatic weighing machine, a weighing receptacle, a hinged flap for closing the bottom thereof, a lever having a cam adapted to press against the edge of the flap from below to keep the latter in closed position, a toggle joint normally holding the said lever with its cam in closing position when stretched, and a catch lever fulcrumed on the framing of the machine and adapted to collapse the toggle joint on the downward movement of the receptacle.

5. In an automatic weighing machine, a weighing receptacle, a lever having a cam adapted to press against the edge of the flap from below to keep the latter in closed position, a toggle joint normally holding said lever with its cam in closing position and adapted to collapse on the downward movement of the receptacle, a catch lever fulcrumed on the framing of the machine adapted to collapse the toggle joint on the downward movement of the receptacle, a second lever fulcrumed on the wall of the receptacle and connected with the bottom flap for holding the said catch lever in osition after the said toggle joint has een collapsed, whereby the same is held in its released position until the receptacle is emptied and the flap closes again to withdraw the last named lever from the catch lever.

6. In an automatic weighing machine, a weighing receptacle, a hinged flap for closing the bottom thereof, a lever having a cam adapted to press against the edge of the flap from below to keep the flap in closed position, a toggle joint normally holding the said lever with its cam in closing position, a catch lever fulcrumed on the framing of the machine and adapted to hold the receptacle in its lowest position until the latter is empty, and to collapse the toggle joint on the downward movement of the rece tacle, a second lever fulcrumed on the wa of the receptacle and connected with the bottom flap for holding the said catch lever in position after the same toggle joint has been collapsed, whereby the cam is held in its released position until the receptacle is emptied and the flap closes again to withdraw the last named lever from the catch lever,

the last named lever at its end provided with a lateral arm to hold the catch lever for a certain time.

JOSEF LAMBERTZ. Witnesses:

PETER DITTSOHEID,

CHRISTIAN DITTSCHEID.

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