US1541521A - Wood-grinding means - Google Patents

Description

June 9, 1925.

G. NENZEL wooD GRINDING MEANS Filed Aug. 25, 19,24

Patented June 9, 1925.

' UNITED STATES TPATENTI OFFICE.

GEORG IQYENZEL, OF HERISCHDORF, NEAR WAR'MBREINN, GERMANY.

WOOD-GRINDING eans.

Application filed August 25, 1924. Serial No 754,036.

To all whom it may concerns Be it known that I, Gnono NENZEL, a citizen of the Republic of Germany, residing at Herischdorf, near lVarmbrunn, in

Silesia, Germany, have invented new and useful Improvements in \Vood-Grinding Means, of which the following is a specification.

This invention has reference to means for the manufacture of ground wood- It is in tended to facilitate the process: of manufacture, to increase the output and improve the quality of the product. In View thereof it is one of the important objects of the invention to feed the wood under a uniform pressure by mechanical means to the grinding stone or similar grinder without the use of a follower by which it is. customary hitherto to push the wood towards the grinder.

In accordance with this invention the feed ing is effected by screw-like or substantially helical means which are adapted to gradually take hold of the wood with increasing force, and during such action and by positive means crowd the wood under pressureand uninterruptedly against the grinder. These feeding and retaining means are mounted in recesses of the containers for the reception of the column of Wood. By the rotation of these feeding means portions of the screw threads are forced into the logs of the heap of wood, so that the heap in consequence of its engagement with the helical or screw-like bodies is positively fed downwards by the same. In order to gradually press the thread grooves into the wood without, however, necessitating an excessive-- ly large expenditure of power, the screw-like or helical feeding bodies or the like are either inclined in such a mannerthat their axes of rotation at their lower extremities will intersect under a very acute angle; or, with the parallel mounting of the screw-like bodies, they are constructed in such a manner that their diameters are increased in the direction of the grinder, with the effect that with increasing force of pressure the screw threads are cut into the heap of wood at an increasing depth. By this means a reliable feeding of the wood is produced, and at the same time the logs of wood engaged by the screw-like bodies are forced away from the walls of the container charged with the wood in the well known manner, and in view thereof the friction of the wood against the walls of the container is diminished. I

j The invention will be more fully described with reference to the accompanying drawing in which Fig. 1 represents that form of the invention in which inclined screws are used to push the wood towards the grinder. Fig. 2 represents that form of the invention in which the wood is pushed towards the grinder by helical bodies, the diameter of which is increased in the direction of the grinder.

Referring to Fig. 1, above the grinding stone or the like 1 the wood container 2 is disposed. In two oppositely arranged side walls of said container 2 a pair or a pluralit-y of shaft-s or spindles 3, provided with sharp screw threads are mounted in such a manner that the threads in the vicinity of the grinding stone 1 project into the container 2, while further away therefrom in the upper portion the threads recede, approaching the walls of the container more and more. The spindles 3 may be positively operated from the grinder shaft 4. It will be evident that, after the charging of the wood container 2 at a corresponding rotation of the spindles 3 the screw threads of the same will become engaged with gradu ally increasing incisions into the wood to be ground, so that they produce a uniform feeding of the wood and crowd it against the grinding stone 1 with substantially unchanging pressure. In view of the inclined position of the spindles 3 the screw threads during the descent of the column of wood become more and more deeply impressed and engaged with the wood, so that the wood,

even if it comprises logs of different size, is grasped with increasing firmness, and is thereby prevented from yielding to the pressure force. The pieces of wood seized by the spindles are at the same time crowded away more and more from the container walls, resulting in a more compact and denser arrangement of the wood, so that the portions of wood which are relatively centrally disposed in the heap, areforced with equal pressure against the grinder likewise. The modification shown in Fig. 2 differs from the before-mentioned construction only by the arrangement of screw-like bodies 5 the diameter of which is increased in the direction of the grinder. The action of these bodies is the sameas above described. It is immaterial with both modifications of con.

struction Whether the column of Wood is forced against the stone from above or "from the sides. It is also possible to crowd several columns of Wood against the grinder under different angles. The crowding by means of the novel device according to this invention may also be effected against the front surface of the gril'iding' stone or the like.

I claim 1. In a Wood-grinding apparatus the combination with a rotating grinder of a Wood container and a pair of stationary rotatingfeeding screws partially projecting into the container at its front and back Walls, said screws being inclined in opposite directions to grasp the column of Wood during its movement toward the grinder, by the screw threads with gradually increasing incisions.

2. In a Wood-grinding apparatus the combination with a rotating grinder of a Wood container and a pair of stationary rotating feeding screi'v-lilze bodies partialiy project ing into the container at its front and back Wall, said screiv-like bodies being constructed With a. diameter increasing in the direc tion of. the grinder.

In testimony whereof I have signed my name to this specification.

GEORG NENZ EL.

Witnesses F. NEROLF, C. LANGE.

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