US1982597A - Log washer shaft and arm assembly - Google Patents

Description

Nov'. 27, 1934. w. s. ROCKHILL LOG WASI-iER SHAFT AND ARM ASSEMBLY Filed 'Aug. 17, 1932 Patented Nov. 27, 1934 UNITED STATES LOG WASHER SHAFT AND ARM ASSEMBLY William Stackhouse Rockhill, Bristol, Pa., assignor to Taylor-Wharton Iron & Steel Company, High Bridge, N. J., a corporation of New Jersey Application August 17, 1932, Serial No. 629,235

2 Claims.

A log washer, so-called, is a machine or device for Washing sand and gravel, ore, and the like. It essentially embodies a trough or housing in which a shaft revolves on a longitudinal axis. The shaft is equipped with arms or heaters in spiral order of arrangement and as the washer generally is set up in inclined position, the rotation of the shaft moves the washed material from the lowest to the highest point of the machine from whence it is discharged. The arms or beaters suffer heavy wear in service and require to be repaired or replaced at frequent intervals and this is expensive and vexatious because the arms are riveted and the job of cutting out the old rivets and riveting new parts entails considerable disorganization and often results in protracted shutdowns.

The principal object of my invention is to provide a log washer shaft and arm assembly of simple, highly efficient, and comparatively inexpensive construction and which will admit of the replacement of the wearing tips of the arms in an easy and expeditious way and by unskilled labor, and without the necessity of practically disorganizing the device and so making for protracted shutdowns as are occasioned under the old practice of removing old rivets and driving new rivets.

The nature, characteristic features and scope of the invention more readily will be understood from the following detailed description taken in connection with the accompanying drawing, forming a part hereof, wherein Figure l is a transverse section through the shaft or center mounting showing the nature of the assembly.

Fig. 2 is a section on line 22 of Fig. 1.

Fig. 3 is a section on line. 3-3 of Fig. 1.

Fig. 4. is a section on line 44 of Fig. 1.

Fig. 5 is a perspective view of one of the arms showing the manner of interlocking the base and wearing tip.

Under preferred practice, the shaft is formed in part of angle bars 5 and in part of devices 6 constituting spacer blocks for the angle bars and also arms or base elements of the wearing tips 7. The angle bars, four in number, are arranged so that their opposed webs are parallel and spaced apart to accommodate the spacer blocks or arm bases 6. This assembly of angle bars and bases, in end view or cross-section, is of general cruciform design.

The angle bars 5 and arm elements 6 are rigidly tied, as for example, by rivets 8. They might, however, otherwise be integrated in any conventional manner, as for example, by welding.

The arm elements 6 may be, and preferably are, of the blind cavity or box-section form, as at 9, with side vents 10. The effect of this construction is to reduce the weight of the metal which is an important consideration when the arms are constructed of alloy steel, as for example, manganese steel. The chambered and vented construction is also desirable to insure uniform heat treatment of metal such as manganese steel. And not the least important consideration is that the described construction, in conjunction with the angle bars, admits of free circulation, in that the side vents or windows 10 obviate the trapping of material in the box-section cavities and thereby materially aid in the maintenance of the open construction of the shaft.

The cast or forged arm elements 6 are also formed with rivet holes 11 disposed so as to register with those in the angle bars and thus enable the parts to be assembled with ease and celerity.

The head extremities of the arm elements 6 are formed or provided with angularly disposed undercut notches, slots or channels 12, whose office is to form one element of a quick-acting interlock with the wearing tip. Coincidently, the wearing tip 7 is formed at one end with a flaring or dovetail portion 13 adapted slidably to engage with the slot in the base. A key 14 cooperates with theinterlocking parts effectively to secure them as a unit. When so secured, and by reason of the angular disposition of the slot, the wearing tip is askew with respect to its base and this contributes tothe general spiral arrangement of the full complement of the arms.

Having described the invention, I claim 1. A log washer shaft comprising angle bars,

devices whereby they are spaced apart and tied as a unit Which'is cruciform in cross-section, said devices constituting radial arms of the fixed shank and removable tip type and whereof the shanks are of box-section with side windows in opposed relation to provide for unobstructed fiow and thereby prevent trapping of material, the windowed portions of the shank elements being located between the angle bars and within the shaft section, whereby the shaft has an unobstructed passage throughout its length for flow of material therethrough.

2. In a log washer, in combination, shaft sections of L-form, and diametrically spaced radial arms joining the Us in cruciform section and establishing therewith a continuous passage throughout the length of the shaft, said arms having'radial cavities communicating with said passage and having slots in their side walls communicating with the cavities and open to the clear whereby an unobstructed fluidway is provided to inhibit trapping of material and loading of the shaft.

WILLIAM STACKHOUSE ROCKHILL.

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