US1241935A

US1241935A - Automatic stop for grinding-mills.

Info

Publication number: US1241935A
Application number: US16411417A
Authority: US
Inventors: Louis Dellert
Original assignee: Individual
Current assignee: Individual
Priority date: 1917-04-24
Filing date: 1917-04-24
Publication date: 1917-10-02
Anticipated expiration: 1934-10-02

Description

l.. DELLERT.

AUTOMATIC STOP FOR GRINDING MILLS. APPLICATION FILED APR. 24. I9I1.

1,241,935. Patented oct. 2,1917.

i 6,/ s SHEETS- SHEET I.

so 65 .50 ff o III' a@ T1 :1.1.

I V l l 45 f .35 m Il 30 i Q I ,87 /j /0 /3 2.5' I, I l\ L 42M f Lamis' Dd/ew' "/"fa *d l L. DELLERT.-

AuToMATlC STOP FOR GRINDING MILLS.

APPLICATION FILED APR. 24.1911.

Patented Oct. 2,1917.

3 SHEETS-SHEET 2.

Tia-5- W/TNESSES ATTORNEYS L. DELLERT.

AUTOMATIC STOP FOR GRINDING MILLS.

APPLICATION FILED APR. 24. I9I7.

1,241,935. Patented oct. 2,1917.

3 SHEETS-SHEET 3.

IIIf-QII INVENT? A TTORNEYS OFFICE.

LoUIs DELIJERT. 'oF-= 1111001; m n' AUTOMATIC s'rr For.l Venturina-MILLS.

Specioation of Leit-ters Patent.

Patented oct. a, 1917.

' .ppneauon ined April 24, 1917. serial No. 164,114.

To all whom t may concern:

Be it known that I, LOUs DELIjER'r,

of the city of New York, boroughof Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Automatic Stop for .Grinding-Mills, of which the following is a full, clear, and exact description.

The invention relates to mills for grinding coffee,dried cereals and other materials, and its object is to provide amew and improved automatic stop controlled by the material to be ground between'two grinding members to stop the driving means for the mill immediately after the last portion of the material 'is passing out between the grinding members.

In order to produce the desired result, use is made of a pair of coacting grinding members adapted to grind the material between them, one of the grinding members being driven to rotate in one direction and the other grinding member being mounted to oscillate, a spring device Iconnected with the said oscillating grinding member in the direction in which the other grinding member is rotating, and stopping means for the mill controlled by the said spring device.

yA practical embodiment of the invention is represented in the accompanying drawings forming a part of this specification, in which similar' 'characters of reference indicatecorresponding parts in all the views.

Figure l is a .sectional side elevation of a grinding mill provided with the automatic stop; y

Fig. is a side elevation of the same with rparts in section;

Fig is a sectional plan view of the same on the line' 3--3 of Fig. 1;

Fig. 4 is a cross section of the same on the line fl-t of Fig. 1 and showing diag-rainnlaticall)Y the electric motor and tlu` stopping mechanism for the same;

Fig. 5 is a similar View of the saine with the parts in a different position',

Fig. 6 is a cross .section of the mill on the lnel-6 of Fig. 1,

Fig. 7 is a plan view of the electric switch with the switch handle shown in section; and

Fig. S is a side elevation ot' the grinding mill and a portion ofthe electric motor for driving the same.

In the casing 10 of the grinding mill is a citizen of the United States, and a resident mounted to turn a shaft 11 on which is secured a grinding member 12, preferably in the form of a disk, having grinding teeth 13 on one face. The grinding teeth 13 coact with similar grinding teeth'l4 arranged on an oscillating grlndmg member 1o to grind the material between the members 12 and 15, as hereinafter more fully explained. The grinding member 12 is continually drivenin one direction, and for this purpose the shaft 11 is coupled with the vshaft 20 of a motor any approved construction. p

The hub-of the rotary grinding member 12 1s 1n the form of a feed screw and ex'- 21, preferablv of the electrical type andof grinding member 15 and this hub 26 is provided with an inlet opening 27, preferably7 located on the top and in register with a hopper 28 for feeding the material to the feed screw which delivers the' material between the grinding faces of the grinding members 12 and 15.. The oscillating grinding member 15 is provided with an annular flange 30 extending across the peripheral face ofthe rotary grinding member 12. and in the lower portion of this Flange 30 is formed an outlet 31 for discharging'the ground material through an opening 32 formed in the bottom'of the easing 10. The outlet 31 is surrounded bv a ring 33, preferably made ot' rubber, and adapted to abut against the walls of the outlet opening as will be readil)v understood by. reference. to Fig. (l. The top of the `flange 30 is provided with a pin 34- surrtunuled b vja ring 35 of rubber or similar inaterial.':1nd this ring is adapted to abut against one side 36 of an extension, 537 of the easing 10. and is also adapted to abut againsta screw 38 screwing inthe side wall of the extension 37 f lireetlwv opposite tlu` wall 3V. By the arrangement described. the oscillating movement of .the grinding nulnber 15 is'lilnited and the outlet Pil 'is always in register with the -eorrelspending-hv enlarged outletopening 32 of the easing. f

Inl the end of the huh 2G of lheoseillating grinding member 15 is arranged a ltransversely extending holt 40. on one-end of which is piroted an angular of'lfset of a hook 42 proridedon its shank with a collar -l-B on which is seated ,the lower end of a spring -l-l resting with its upper end in a cup 45 attached or formed on a plate 46 secured to tends within the hub 26 of the oscillating the housing 10. Normally the spring 4st is in the extended position shown in Fig. 4, but when the mill is ruiming and the material to be ground passes between the grinding faces of the grinding members 12 and l5 then the grinding member 15 is caused torotate in the direction in which the grinding member 12 is rotating by the action of the material on the teeth 11 of the grinding member 15. The oscillating movement given to the grinding member 15 in the direction of the arrow a' causes a compression of the spring 11 (see Fig. 5), and when the last portion of the material is ground and passes out from between the grinding faces of the grinding members 12 and 15 then the spring +1 returns the grinding member 15 to its normal position. Thus the oscillating movement of the grinding member 15 in one direction is controlled by the material passingbetween the grinding faces of the grinding members 12 and 15 to be ground, and the return movement of the oscillating member 15 is accomplished by the spring 44:.

The hook -12 controls a switch 50 arranged in a circuit 51 of the motor 21, and this switch is preferably of the knife type and is arranged as follows, special reference being had to Figs. 1, 2, 4, 5 and 7. On the plate 1G is secured a block 54,- of rubber or other insulating material, and on this block are arranged brackets engaged by the pivots 5(3`of the side arms of a switch lever 5T adapted to engage contact members 5S held on the block 51. The side arms of the switch lever 5T are connected with each other by crossbars 59 of rubber or other suitable insulating material, and on the said crossbars 59 is secured a bail (SO carrying a handle ('1 extending through a slot 62 formed in a switch casing 6? attached to the casing 10, the said casing having a bearing portion (il inclosing the spring 41. and the bolt l0. The bail GO is provided with a shoulder (35 adapted to be engaged by the head GG of the hook l2 to swing the switch lever 5T from closed in to open position', .is hereinafter more fully explained. The bail (3() is provided above the shoulder 65 with. a stop arm GT adapted to be engaged by the head (5G of the hook 12 to limit the upward movement thereof. Owing to the offset -11 on the spring-pressed hook 42 the latter tends to swing to the right against a shoulder GS formed on the plate 16 to properly engage the head ('t of the hook 42 with the shoulder (S5 at the time thc switch is closed (see Fig. 5) to subsequently swing thel switch into open position. The shoulder 68 swings the hook 12 to the left with a View to disengage the head 66 from the shoulder at the time the oscillating grinding member 15 nears the end of its return movement (see Fig. l). The bail (30 is provided with a rubber bumper 59 adapted to engage the block 51 to limit the swinging movement of the switch lever 5T.

lVhen the switch is in the open position .shown in Fig. 1 and it is desired to start the mill, then it is only necessary for the operator to take hold of the handle G1 and swing the same over to the left to engage the switehlever 57 with the contact 5S to close the circuit 51 for the motor 21 so that the latter is started and the rotary grinding member 12 is rotated.

The material to be ground and fed through the hopper 28 passes into the hub 2G and is fed by the feed screw between the grinding faces of the grinding members 12 and 15. vand this material. acts on the grinding member 15 to oscillate the latter against the tension of the spring 11. During this oscillating movement of the grinding member 15 in the direction in which the other grinding member is running, the hook 12 assumes the position .shown in Fig. 5. 'hen the material has been ground and the last portion thereof is passing out from between the grinding faces then. the spring' 41 turns the grinding wheel 15 in the reverse direction of the arrow a' and at the same time the hook l2 engages with its head 66 the shoulder G5 thus iinpartinga swinging motion to the switch lever 5T to disconnect the latter from the contact 58. The motor circuit is now broken and the motor comes to a stop.

The end of the hub 2G abuts against an abutment S0 forming a bearing for the adjacent ends of the shafts 11 and 20, and in loo order to take up wear the head S1 of the bolt l() previously mentioned is made conical and abuts at one side against a shoulder S2 forming part of the, casing 10. It will be noticed that on screwing up the nut S3 105 of the bolt +10, the head S1 thereof by bear. ing against the shoulder 82 forces the hub 2G and consequently the grinding wheel 15 to the left and against the abutment 81., The shaft 11 and its grinding wheel 12 can" 11o be adjusted relative to the oscillating grinding wheel 15 by the use of a screw S5 screwing in the outer end of the bearing Sti in which the right-hand end of the shaft 11 is jmirnaled. Thus b v the arrangement de- 115 .scribed the wear of the grinding member 15 in its bearing can be taken up and the other grinding member 12 can be adjusted to keep the grinding faces of the said grinding wheels 12 and 15 at all times in 120 the proper relation to each other to grind the material to the desired fineness.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. In a grinding mill, a pair of enacting grinding members adapted to grind the material between them, one of the grinding members being driven to rotate in one di# rection and the other grinding member be- 13e ing mounted to oscillate, a spring device connected vwith the said oscillating grinding member and placed under tension on oscillating the said oscillating grinding member in the direction in which the other grinding member is rotating, and stopping means lfor the millvcontrolled by 'the said spring device.

EZ. In a grinding mill, a pair of coacting grinding members adapted to grind the material between them, one of the grinding members being mounted to turn continuously in one direction and the other grinding member being mounted te oscillate, a resistance connected with the said oscillating grinding member and opposing the oscillating of the oscillating member in the direction in which the other grinding member is rotating, and means carried by the oscillating member for limiting oscillation thereof.

S. In a grinding mill, a pair of coacting grinding members adapted to grind the material between them, one of the grinding members being mounted to turn continuously in one direction and the other grinding member being mounted to oscillate, driving means for the said rotary grinding member, a spring connected with the said oscillating grinding member to oppose the latter`s oscillation in the direction in which the other grinding member is rotating, and means connected with the said oscillating grinding member and the said driving means /to stop the latter on the return movement of the'oscillating grinding member.

4. In agrinding mill, a pair of coacting grinding members adapted to grind the material between them, one ofthe grinding members being mounted to turn continuously in Vone direction and the other grinding member vbeing mounted to oscillate, an electric motor driving the said rotary grinding member, a spring opposing the said grindingmembel.' on the latter turning in the 'direction in which the other grinding member is rotating, and a shut-oil"v switch for the said electricmotor and connected with the said' oscillating grinding member lto stop the motor, on the return of the said oscillating member 4caused by the said spring.

5. In a grinding mill, a pair of coacting grinding members adapted to grind the material between them, one of the grinding members being mounted to turn continuously in one direction and the other grinding member being mounted to oscillate, an a rmon the said loscillating grinding .member, a hook pivnted on the said arm, a spring pressing the said hook, and a motor controlling means adapted to be engaged by the said hook to stop the motor on the return movement of the oscillating grinding member by the action of the said spring.

6. In a grinding mill, ay pair of coacting grinding members adapted to grind the material between them, one of the grinding members being mounted to turn continuously in one direction and the other grindingl member being mounted to oscillate, driving means for the said rotary grinding member, an arm o n the said oscillating grinding member, a hook pivotally connected with the said arm, a spring pressing the. said hook, and a switch controlling the said drivingmeans and adapted to be engaged by the said hook to open the switch and stop the said motor on the return movement of the said oscillating grinding member caused by the said spring.

7. In a grinding mill, a pair of coacting grinding members adapted to grind the materialv between them, one of thegrinding members. being mounted to turn f continuously in one direction and the other grinding member being mounted to oscillate, driving means for the said rotary grinding member, an arm on the said oscillating grinding member, a. hook pivotally connected with the said arm, aspring pressing the said hook, a switch controlling the said driving means and adapted to be engaged by the said hook to open the switch and stop the said motor on the return movement of the said oscillating grinding member caused by the said spring, andmeans to disengage the said hook from the said switch after the grinding members adapted to grind thematerial between them, one of the saidk grinding members being-mounted to rotate and the other being mounted to oscillate, means for continuously rotating the said rotary grinding member, a feed screw'fon the said rotary member to `feed the material between the said grinding members, the said oscillating grinding member having a lhub inclosingthe said. feed screw, the hub having an inlet opening, the said oscillating grinding member having an annular Aliange extending across the peripheral'face of the said rotary .grinding member, the flange having an outlet opening, and a hopper connected with the said inlet opening.

9. In a grinding mill. a pair of coacting grinding members, of which one is driven and. provided with a feed screw to feed the material betweenl the grinding members, the other grinding member having a hub inclosingthe said. feed screw, a bearing ing grinding members adapted to grind the 'lim material between them, one of said grinding members mounted to rotate continuously and the other grinding),r member mounted to oscillate, means for feedinff the material from the inlet and between the said grinding members, said oscillating grinding member havingT an annular flange extending across the peripheral face of said rotary grinding member, the flange having an ontlet opening, and means carried by the oscillating grinding member maintaining the outlet in said fianqe in registry with the aforesaid outlet of the casing.

LGUIS DELLERT.