US2295633A

US2295633A - Comminuting means

Info

Publication number: US2295633A
Application number: US294147A
Authority: US
Inventors: Chase Corson Walter
Original assignee: Chicago Pump Co
Current assignee: Chicago Pump Co
Priority date: 1939-09-09
Filing date: 1939-09-09
Publication date: 1942-09-15
Anticipated expiration: 1959-09-15

Description

Sept. 15, 1942. c. w. CHA 2,295,633

COMMINUTING MEANS Filed Sept. 9, 1959 INVENTQR 60/9'0/7 l Va/fer 6/7056.

ATTORNEY.

Patented Sept. 15, 1942 UNITED STATES PATENT OFFICE? ration of Illinois Application September 9,1939, Serial NQ.-294,147

ting elements shown in Fig. 2 partly in plan and partl in horizontal section.

Claims.

This invention relates to comminuting means of which the comminutor is interposed in a flowing stream of liquids containing solids, and functions first, todetain solids that are too large to 'pass through slots of the comminutor along with the flow of liquids, and second, to reduce the Fig. 4 is a detail vertical section taken on the line 4-4 of Fig. 3.

solids to particles small'enough to pass through a the slots. The invention has reference more particularly to that .type of comminutor through which the flow moves transversely through the I comminutor, and is commonly called through flow" comminutors. v V Inthrough flow comminutors considerable dif ficulty has been encountered by reason of solids accumulating on the upstream. side of the com minutor and particularlyat the stationary cutting element thereof, the result being that the cutting teeth of the comminutor merely 'cut grooves in the accumulated mass and run idly in the grooves. Furthermore the accumulated mass clogs the comminutor slots and blocks the flow of liquids therethrough, thereby requiring frequent attention by an-attendant in the mass.

One object of the present invention is to proclearing away vide an arrangement of parts whereby the flowing stream sets up eddy currents at the station-' ary cutting element of the comminutor,-whereby the'solids are agitated and are not permitted to accumulate in amass but are kept in motion whereby different parts thereof are constantly being presented to the cutting elements.

Fig. 4c is a detail fragmental perspective view ofthe cutter carrier and the cutter shown in Figs. 3 and '4.

Fig. 5 is adetail view of fragments of another form. of cutting elements, partly in plan and partly in horizontal section.

Fig. 6 is a detail vertical section taken on th line 6-6 of Fig. 3. I a

Fig. 7 is a detail fragmental side elevation of another modified form of cutting means.

Fig. 8 is a detail vertical section taken on the line 8-8 of Fig. '7.

Referring to said drawing and first to Figs. 1 and 2, the reference character In designates a channel, desirably formed of concrete, through which flows sewage or other liquids containing solids. The flow of the streamis in the. generaldirection indicated by the arrows in Fig. l.

The character H designates the upstream or inlet end, and I2 thedownstream or outlet end, and l3- a pit or offset part ofthechannel. The comminutor l4 is located at the offset part of the channel, and-a deflecting wall is extending from the straight wall of the channel to a wall 1 It in the pit, se rves,to dam up the flow on the.

Another object is to provide novel cutters on the rotating elements of the comminutor which function to rid the slots of solids and also serve.

to cut or comminute the solids. The cutters also function to prevent entanglement of fibrous solids with the cutters and co-actingstationary cutting element. This entanglement prevents the free motion of solids in the process of being cut up 40.

'1 minutor.

after fully set forth and claimed.

The invention is clearly illustrated in the drawing accompanying this specification, in which:

Fig. 1 is a plan view of a portion of a sewage channel and illustrating one embodiment of the comminuting means therein.

Fig. 2 isa vertical longitudinal section taken on the line 2-.-2 of Fig. 1.

up stream side of the comminutor. The wall- I6 may be composed of structural metal work and concrete and contains an opening in which the comminutor is located.

An offset or recess Ilia is provided between the channel wall I la and the comminutor IQ, in

which eddy currents are set up by the flowing stream at the place where the comminuting action of the comminutor takes place. The eddy currents serve to agitate solids that are likely to accumulate-at the cutting place of the com- The comminutor comprises in general a series of spaced discs or other cutter carriers 22, mount- -ed on a shaft 2|, driven by an electric motor 20,

supported on the wall I I6. Located in the spaces between thediscs, on the up stream side of the comminutor, are stationary spaced semi-circular screen bars Hi, the ends of which are bolted or Fig. 3 is a detail view of fragments of the cut- The'screen bars and discs detain or intercept the v bolted tcT the wall structure l6, which if desired may comprise structural metal frame work and concrete. The cutting bar is located in the oflset or recessed part Ilia of the channel, where the eddy currents are set up and stir or agitate any solids that accumulate at the cutting bar and thereby prevent them from lodging in a somewhat fixed position at the place where the comminuting action takes place. The wall It serves to direct the flow in the channel towards the wall Itand the comminutor M, in the arrangement of the parts as illustrated in Figs. 1 and 2.

The cutters employed on the discs may take various forms, and the one shown in Figs. 2, 3, 4, and 40 will now be described.

The cutter shown in these figures comprises a body M of the same thickness as the disc 22, and it is seated in a notch 44 formed in the edge portion of the disc. Projecting laterally from the body M are combined slotscrapers 38 and cutting teeth 45, of which the scrapers travel in the adjacent slots between the disc and screen bars l8 and serve to rid the slots of any material that may have lodged therein. The scrapers 39 may be in the form of lugs formed on the upper and lower sides of the body and they protrude exteriorly of the slots and are formed with the cutting teeth 45 on their protruding edges. The body is made longer than the lugs to provide tail pieces for receiving the bolts or screws 43 which fasten the cutter to the disc.

The cutting bar, one section of which is shown at 39, is fastened to the frame structure of the wall I 6 as by bolts or screws 40, and is formed with cutting teeth 39a between which are notches through which the cutting teeth 65 of the cutters pass and cooperate with the notched cutting bar to cut away small pieces of solids that are caught between the cutting bar and cutting teeth. The front face of the cutter body may be made flat as at '42 if desired.

The walls l5 and I6 prevent liquids from passing from the upstream side of the comminutor to the downstream side thereof, except by flowing horizontally through the spaces between the cutter carrying discs from one side of the comminutor to the other. Comminutors of this type have been commonly designated as through flow" comminutors.

In the form of cutter illustrated in Figs. 5 and 6 the combined slot scrapers 36 and cutting teeth 3! are of the same length as the body 84, which is seated in a notch in the disc 28 andfastened thereto by bolts or screws 33. The scraper parts of the cutters travel in the slots between the disc 28 and adjacent screen bars 21. The cutter bar sections 29 are fastened to the wall structure It by bolts or screws 30, and its teeth 35 leave notches therebetween for the passage of the cutting teeth 3! as in the form previously described.

in the disc 41 and fastened thereto by bolts or screws 53. Scraper lugs II project laterally from both sides of the body of the cutter, one from either en thereof and travel in the slots between the disc 41 and screen Lars 46. A cutting tooth 55 projects outward from the'body 52 and coopera es with the notched cutting bar section 48 to comminute solids. The cutting bar section is fastened to its support by bolts or screws 49.

In all of the forms of cutters shown, the laterally projecting lugs thereof serve as scrapers traveling in the slots l9 and freeing them from solids that may have become lodged therein, and the cutting teeth cooperate with the cutting bar to comminute solids. Any solids such asrags, paper string and so forth that lodge on the stationary screen bars or may enter the slots, are carried along the screen bars by the cutters to the stationary cutting bar where they are comminuted.

Iclaim as new and desire to secure by Letters Patent: 1

1. In comminuting means, a through flow comminutor having rotating spaced cutter carrying discs between which liquids flow from one side of the comminutor to the other side thereof, said discs being provided with cutting teeth on their edges, and a stationary notched cutting bar, cooperating therewith to comminute solids, in combination with walls providing a channel in which the comminutor is located and other wall means cooperating with said channel walls to provide a recessed space, which is laterally oiI-set with respect to one of the channel walls, the comminutor being disposed, in part, in said recessed space with its cutting bar located in said space, whereby eddy currents, formed in said space by a flowing stream, agitate solids that accumulate on the cutting bar in said space. 2. In comminuting means, a through flow comiminutor, having stationary semi-circular screen bars and spaced rotatable cutter carrying discs with their edge portions traveling in the spaces between the screen bars and provided with teeth which project radially beyond the edges of the discs, the edge portions of the cutter carrying discs being spaced from the screen bars to provide slots between the cutter carrying discs and screen bars, through which liquid flows from one side of the comminutor to the other, and a stationary notched cutting bar co-operating with said cutting teeth to comminute solids, in combination with walls providing a channel in which the comminutor is interposed and other walls cooperating with the channel walls to provide a laterally recessed space, the comminutor being disposed, in part, in said space, with its cutting bar located in said space, whereby eddy currents formed in said space by a flowing stream, agitate f solids that accumulate on the cutting bar in said space.

3. In comminuting means, a through flow comminutor, having stationary spaced semiecircular screen bars and spaced rotatable cutter carrying discs with their edge portions traveling in the spaces between the screen bars and provided with cutting teeth which project radially from the edges of the cutter carrying discs, the edge portions of the cutter carrying discs being spaced from the screen bars to provide slots between the cutter carrying discs and screen bars, through which liquid flows from one side of the comminutor to the other, and a stationary notched cutting bar co-operating with said cutting teeth to comminute solids, in combination with walls .providing a channel, in which the comminutor is eddy currents formed in said space by interposed, a wall oil-set laterally irom one of the channel walls, having-an opening therein to receive the cutter carrying discs of the comminutor, and other walls connecting the ends or said ofl-set wall with the two walls-of the channel to provide a laterally oil-set recess, the comminutor being disposed, in part, in said space with its cutting bar located in said space, whereby a flowing stream, agitate solids that accumulate on the cutting bar in said space.

4. A comminutor comprising spaced semi-circular screen bars, spaced cutter carrying discs with their peripheral edge portions disposed in the spaces between the screen bars, there being slots between said screen bars and edge portions or the cutter carrying discs, cutters secured to the cutter carrying discs at the edges thereof and having lugs projecting laterally from the cutter carriers into the adjacent slots, said lugs being provided with cutting teeth projecting beyond the external faces of the screen bars and cutter carriers, a stationarynotched cutting bar cooperating with the cutting teeth of the cutters to comminute solids caught between the cutting bar and cutting teeth, and means to produce relative rotation between the cutter carriers and cutting bars.

5. A comminutor comprising stationary spaced semi-circular screen bars, rotatable spaced discs with their edge portions disposed in the spaces between the screen bars, there being slots between the screen bars and discs. cutters secured to 1 lugs being formed with cutting teeth projecting between the screen bars and discs, cutters secured to the discs at the edges thereof, said cutters comminute solids.

body portions into the adjacent slots; and the beyond the external faces oi! the screen bars and discs,- and a stationary notched cutting bar cooperating with the cutting teeth of the cutters to 7.- A comminutor comprising stationary spaced semi-circular screen bars, rotatable spaced discs with their edge portions disposed in the spaces between the screen bars, and there being slots hav body portions seated in notches in the edges f said discs and lugs projecting laterally from the body portions into the adjacent slots, the body portion of thecutters extending circumferentially' beyond the ends or the lugs whereby to receive the means that secure the cutters to the discs, said cutters being also formed with cutting teeth'projecting radially beyond the external iaces oi? the screen bars and discs, and a stationary notched cutting bar cooperating with the cutting teeth to comminute solids.

8. A comminutor comprising stationary spaced semi-circular'screen bars, rotatable spaced discs with their edge portions disposed in the' spaces between the screen bars, and there being slots between the screen bars and discs, cutters secured to the discs at the edges thereof, said cutters hav ing body portions seated in notches in-the edges of said discs and lugs projecting laterally from the body portions into the adjacent slots, said lugs being locatedat the ends or the body porthe discs at the edges thereof, said cutters hava ing body portions seated in notches in the edges oi said discs and lugs projecting laterally from the body portions into the adjacent slots. said cutters having also cutting teeth projecting beyond the external faces of the screen bars and discs, and a stationary notched cutting bar cooperating with the cutting teeth of the cutters to comminute solids.

tion, and the cutters being formed with cutting teeth aligned with the discs, and a stationary notched cutting bar cooperating with said cutting teethto comminute solids. 9. In a comminutor, a cutter carrying disc, and a cutter comprising a body portion secured in the edge portion oi! the disc and having scraper lugs projecting radially. from both sides or the disc, and a tooth projecting radially from the body portion.

10.,In a comminutor, a cutter carrying disc, and a cutter comprising a body portion secured in the edge portion of the disc and having scraper lugs projecting laterally from both sides or the disc, said lugs having cutting teeth on the front edges thereof.