US1315281A - Planoqr - Google Patents

Description

E. B. CAMPBELL.

REDUCING MILL.

APPLICATION FILED FEB. :0. I919.

Patented Sept. 9, 1919.

////J'llllfl// M INV'EJY'TOR. ,Edrrardfl. Camphll,

THE COLUMBIA FLANOURAPII (0., WAIIIINGTON. D. c.

UNITED STATES PATENT OFFICE.

EDWARD B. CAMPBELL, ors'r. Louis, m ssouni, ssume To WILLIAMS ram cnusnnn AND PU'LVEBIZER 00,, or s1 Louis, MIssounI, A CORPORATION 01' nseam. r

I sarcoma-mug Patent-ea se ta 191 9.

Application filed February '10, 1919. Serial No. 276,166.

To all whom it may concern Be it known that I, EDWARD B. CAMPBELL a citizen of the United States,residing at St. Louis, State of Missouri, have invented certain new a'nd useful Improvements in Reducing Mills, of which the following is a specification. 1

This invention relates to certain new aifd useful'improvements in reducing mills having especial reference to rot-aryhammer's for mills used for grinders feed cutter-sand like reducing mills, the peculiarities of which will be hereinafter described and claimed.

The main object of my improvements is the provision of a flat bar'rotary hammer forming a long, thin operative edge at front and rear Operating in the cylindrical curved plane of rotation of the head, which head is formed at right angles to the leg by which it is pivoted so that said hammer maybe mounted in multiple in a rotor and thus secure, a more flexible action on the material fed to said mill than the so called stirrup hammer that has a long operative edge extending between two legs by which it is pivoted.

In the accompanying drawing on which like reference letters indicate corresponding parts, Figure 1 represents a vertical sectional view of the housing of a mill and rotor embodying my improvements, the section being taken across the shaft; Fig. 2 a partial sectional view of the housing taken in a vertical axial plane, and face View of part of the rotor with hammers of my style with a sharpened ed e; and Fig. 5 a similar I view of a hammer 0' three pieces riveted together through line 28; Fig. 6 a similar View of a half length head hammer to fill out a row of T-head hammers; and Fig. 7 a perspective view of a cast T-head showing trunnions.

The letter A designates the housing and B the hopper of a suitable mill in which is mounted the shaft C, carrying pairs of disks D keyed to said shaft and in which are mounted hammer rods E, on which are pivoted hammers of the construction and shape now to be described. A suitable cage Fand breaker plate G is provided for coiiperation with said hammers.

The disks D are mounted in pair or series along'the shaft C, and between each pair of disks the "flat bar legs H of my hammers are mountedas shown in'Fig. 2. The flat bar of which the hammer is composed, is of relativelygreaterwidth than thickness, and i the head I likewise formed of 1a flathar and mounted on-sairl leg so that the head extends laterallyat right angles to the flatsideof said leg substantially a distan ce equal to the length of the leg, thereby presentin the-lesser dimensions of the bar in both t e leg and the head to form the operative edge of head and leg. The flat bar used preferably to form. the leg, is

As shown in Fig. 3, this form of hammer is made from onepiece of flat bar'that is bent and doubled in layers to form a T head hammer. I'n Fig: Ptlie upper layer of the head is beveled or sharpened at its front and rear edge on its outer side, to form a cutting edge and allow of its being reversed and either edge used as the forward cutting edge for the time being. In Fig. 3 the operative edge is plain and square.

Referring to Fig. 2 it will be seen that the T heads of the hammers form rows parallel to the shaft, on account of their being mounted alternately on the rods E as shown in Fig. 1. That is to say, the heads of the respective hammers in one row overlap the path of the following hammers in another row, while they form a long cutting edge that is broken up into individual units and give flexibility in their operation on the material. Thus if a piece of material is struck by one hammer, this hannnor will be pressed backward without influencing the cutting action or slicing action of the other hammers in the same row which are not acting on -this chunk of material, such as bulbs, beets, turnips, etc. In another well known form of grinder, the hammers are independent straight bars pivoted between a series of disks so that the shanks of the hammers occupy practically all the space between the cutting ends and the peripheries of the disks, thus increasing the Weight of the rotor, increasing the opposition of wind and material and requiring greater power to operate than in the present form. In another form of hammer the operative edge is formed by bar'praeticallythe width of the casing and the iong'barheatl has no flexibility of action, as in my style. k

In the form shown in this application, the flexibility of the operating edge is maintained, the space between said edge and the disks is left open, the redneed number of shanks required by the present form of T- heed as compared with the independent hammers mentioned chfiapiens the construction, increases the slicing action, reduces the opposition of wind and material and hence the driving power required. a

While I have shown the single T-hoad and the intermediately located leg for mid head as formed of: a double flat har tihe ham mer may its-otherwise formed as long asthe T head principle and the slicing aetion as distinguished tron] the beating and crust;- ing aetionis maintained as above described. In all these forms of F hammers, the lesser dimension of both the head and the leg is presented to the material bei operated on, end'ithe slieing efi'ect upon t ereaterialis similar to thaat of a stirruphammer with the flateonnectin cross barand legs at the ends of'the cress ar head.

This form of head secures cheapness in construction and the small surface of the cross bar used as the operative edge increases the efliciency of the slicing action in passing through the material, making less wind opposition and causing less expenditure of power.

I claim:

1. In a machine of the character described; a pivotal slicing hammer, consisting of a flat bar, bent so as to form a double flat top and double shank ortions, said top extending laterally beyond said shank and having its upper portion beveled and extending in front of its lower portion on both front and rear forming cutting edges thereon, said shank having openings therein.

2. In a machine of the character described; a pivotal slicing hammer consisting of a flat bar, bent so as to form a double flat top and double shank ortions, said top extending laterally beyon said shank, said shank having openings therein,-the width of said bar being relatively much greater than the thickness so that the lesser dimension of the bar in leg and head is presented to the material being 0 rated on, and siicesthrough the materia substantially as described.

In testimony whereof I have affixed my signature.

EDWARD B. CAMPBELL.

Golden ,oi petentmay be obthiieifor g iyeeents each, by addressing the commissioner of Patents,

' Washington, D. 0.

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