US1687621A - Automatic brake operator for incline hoists - Google Patents

Description

Oct. 16, 1928.

H. H. LOGAN AUTOMATIC BRAKE OPERATOR FOR INGLINE HOISTS www@ Filed Sept.- l0. 1926 ATTORNEYS Oct. 16, 1928. v 1,687,621

H. H. LOGAN AUTOMATIC BRA-KE OPERATOR FOR INCLINE HOISTS Filed Sept. 10. 1926 .2 Sheets-Sheet 2 ATTORNEYS Patented d. 16, 1928.

`,UNITED STATESy HENRY n. LOGAN, or cnrcneb, `tninors.

AUTOMATIC Bnnxn ornnncronron ruomunnorsirs.

Application'l'ed September 10, 1926.' Serial No. 134,743'.V

My invention relates Yto improvementsin automatic brake operator for incline hoist, and it consists in the combinations, construe tions, and arrangements herein described and claimed.

An object of my invention is toprovide an automatic brake operator for inclined hoist which is designed to work in conjunction with a standard safety device for mine hoists, and to eliminate some of the dangers and diihculties encountered inv operating a minehoist to raise and lower a train of cars on slopes or inclines.

A further object of my invention is to provide a device of the type described which maybe applied to any controller for hoist ing engines, but which is specially adapted to be appliedto the hoisting engine controls of Lilly et al., SerialNo. 627,504, filed March et, 192s. Y

A further object of my invention is to provide a device of the Vtype described in which the parts are reversible to be .applied to either a clockwise or a counter-clockwise rotating controller. i

Other objects and advantages will appear in the following specification, and the novel features of the invention will be particularly pointed out in the appended claims;

My invention Vis illustrated in the accompanying drawings, forming part of this ap` plication, in which y Figure 1 is a front elevation of the device as applied to a hoist control,

Figure 2'is a side elevation applied to a hoist control,

Figure 3 is a wiring diagram,

f Figure 4 is a side elevation'of a portion of a hoist control as operatively connected to my device, and v f Figure 5 is an end elevation of a portion of the Vstructure shown in Figure 4.

In carrying out my invention, I provide a frame 1 having a relatively large ange ofthe device as portion 2. The flange portion 2 is provided with openings 3 .for receiving machine screws 4 by means of which the frame 1 is secured to the frame H of a hoist control. The frame 1 is also secured to the frameH at 5 by means of machine screws 6i The flange portion 2 is further provided with an open ing 7 for receiving the shaft 8 of the hoist control. f l

A toothed disc 9 is removably secured to a hub 1() which is keyed uponthe shaft 8. Av

bracket 11 is removably secured to the frame 1` at .the upper end thereof by fmeans of a machine screw 12, and at the lower end thereof by means of a bolt 13. A latch arm 14 is rotatably mountedv upon the bolt 13 adjacent the frame 1, and is provided with a latch 15 at the lower end thereof. A V-shaped groove 16 is formed in the latch 15 in direct alignment with the center ofthe bolt 13V and the center of the shaft 8 when the arm 1s in normal position. The latch arm 14 is heldin normal position by means of a spring 17. lThe latch arm 14 is provided with an upwardly extending portion 18 upon which a forked weight arm 19 is pivotally mounted upon a pin 19. The forked arm 19 is provided with a pin 2O having a iattenedsurface 21. A pawl 22 is pivotally mounted uponpthe pin 19 between the forks of the Weight arm4 19, and is provided with a laterally extending pin23 whiclris adapted to engage with a lug 24 upon the weight arm 19 for holding the pawl 22 in normal position. The endY 25 of the pawl .is positioned so as to engage with teeth v26 of the disc 9. A cam 27 is pivotally mounted upon the bolt 13 andis positioned between the forks of the weight arm 19. The cam27 is provided with acutaway portion v28 for receiving the pin 20 when'innormal position. A cani-actuating arm 29`is pivotally mounted upon the bolt 13 and is provided with tongues 3() which are adapted to be `received within grooves 31fof the lcam 27. The free end of the arm 29 is forked to pivotally receive one end of aconnecting rod32. The free end of the connecting rod 32 is pivotally secured to a core 33 of a solenoid 34.` F langes 35 and 36 are provided upon each side ofthe bracket 11 to which the solenoid 34 maybe k95 Y secured. In the present instance,lthesole Vnoid is secured to the flange The solenoid34 is in electrical connection with 'the-.circuit of the hoist control. In Figure 3, I have shown a wiring diagram illustrating the solenoid 34 in connection with the electrical circuit of a` hoist control. Conductors 37 and 38 representa source of currentwith which a transformer 39 is in direct connection. The" protective contac* indicated at 41, and the overspe'ed switch is indicated at 42.V

A level 43 is in direct connection with the brake mechanism for thehoist drum. The

.tor `is indicated at 40, the Zero-reset switch is hoist drum` and brake inechanisniare well known in the art and have acquired a distinct status therein.

From the foregoing description n of the various parts of the device the operation there-of kmay be readily understood. Without a device of this character, in case the power fails while hoisting a trip, vor ifth'e,V

safety device cuts the power ofi', due to retardation notV beingsconducted properly, especially when they cars are` travelingat considerable speed on a flat part of theslope, it is-,impossible to prevent them. from running aheadof therope `until their momentum is sp ent, an d thenreversing yand going down 2l of thepin20 strikes the pawl 22 Vandv forces the endl 25 fof the pawl upwardly into engagement with the teeth/26 of the disc 9;

When the Vpawl. 22 engages. with the ydisc 9 which is rotatingin a clockwise direction,

the force ,upon the pawl will rotate thelatclr arm about the bolt 13 and force the Llatch 15 free lfromthe lever 43,.thus .causing the brakes to be appliedfin zthe usual way to stop. the hoisting drum.-

If the power fails `during hoisting, 'ory if it is cut ofh-,by'gan automaticsafety controller ybecauselof improper retardatiomthe disc trav` elingun a counter-clockwise, direction will not-movethe latch arm;14untilthe hoisting; dnum. co mes to rest Landundeij theiniiuence ofthe load-reversing starts backin theJ opposite direction.. Duringthe moveinentof the. .disc{9 in a counter-,clockwise direction, the pawl whichhas beenmoved into' f engagement vwith the disc, as heretofore described when the poweriwas cutof,rides` upon Lthe teeth26 until the-disc stopsuts movement in a counter-' clockwise,. direction and ,starts moi/ingin, a clockwise direction. At this .poingthe latch `arm, is forced outwardly, thus releasing the lever 43 and causing the brakes to be Vapplied inithe .usual way tQ-stop, the -.hoisting drum. Therefore, since theldrfum willnot. startin the reverse direction, exceptwhen the load ispulling it, the slack xwill be/taken- .up when theV brakes .are applied ,inthis case and the 4 abnormal strain on,y gthe rope is eliminated. y

In Figure 4, I have shownthehoist contioLiH.l The -brake drum.shaftI 44 is provided with a, brake `drinn 45 concentric with which isy disposed a brake band 46. The

cable drinn 47 .is also rigidly mounted upon theshaft 44 ,and is adapted to be kchecked in its rotation and stopped by the operative enp gagement of the brake band with the brake drum: 'iS-he ends-ofthe brake band 46 are pivotallysecured Ato a double arin 48 which is keyed to a stub shaft 49.k An ai'm 50 is al so keyediotliesliaft 49 at one end thereof. v

The other end of the arm 50 is pivotally secureduto one ,end of amconnecting rod 5l.

The otheixendiof theconnectingrodl is, pivotally 1secured to a lever52 whichiskeyed toA a shaft..y Awveight arm 54,having, a weight 55 mounted upon its outer endfis also keyedto the shaft; 53., A latchy 5 6'is pivotally secured at 5Tto the :weight 55 and lever 43 as heretofore. described, the lever 43 is swungdownwardly 'by the weight. 55.

until the latch 56 is freed frointhe shaft 59 and the-.lever y.43 is returned toitsu'ppermost position by the aid of the vspring ,60., vHow-- ever. .the weight-55 continues in its downward movement about the shaft 53 actuatingthe lever 52, theconnecting rod .51. thearnis 50 and 48, thus drawing the brake bandintoY close engagement rwith, the .brakeV drum ,and

stopping .t erotation. .ofthebrake drum .45,

the drum shaft `44, and Vthecable drum .47.

I claim l. The combinationzwitliia 4hoist having .a

cable druma brake mechanismA for stopping j the rotation of Asaid drum, a lever `for actuatingxsaidbra-ke mechanism when released, and afhoist .contr ol, of `means for holding. said lever in set position, and ,means yincludinga ratchet. wheel andv pawl cooperating` `rwith said hoist control jvfor automatically: releasing said ybrake lever ,i when .said hoisting,y drum is rotating in one direction, said means not releasing said brake levenwhen y:the,hoisting drum isy rotating inthe opposite direction.

2. yThe combination with :a hoist having a cable drum, a brake mechanism forstopping the rotation of. said drum, alever vforY actuating said brake mechanismzwhen released, and a; hoist controlhaving La 4sha ft ,.of means for .holding said lever inf'setpositiomfand means including aratchet wheel and 'pawl cooperating withy saidlshaftf for automatif cally releasing said brake lever' when `said hoistingl drum ,isfrotating in one direction.

3. Thev combination with, ahoist; havinga cable y, drum, abrake 4 mechanism for, stopping the rotation of said druina lever foractuating saidl brake -mechanism wli en1eleased a hoist control having a. shaft, of a toothed .disc removably,secured to` said shaft-,f alatch arm for holdingsaid lever in set position, =and means cooperating withv said toothed vdisc for automatically releasing saidbrake lever. 4. The combination with a hoist control having a shaft operatively connected to a cable drum, a brake mechanism for stopping v the rotation of said drum, a lever for actuating said brake mechanism when released, of an arm for holding said brake lever in the set position, a paivlpivotally mounted upon said arm, means for moving said pavvl into operative position, Vand means removably mounted upon said shaft for engaging with said pawl for moving said arm for releasing said brake lever.

5. The combination With a hoist control having a shaft adapted to rotate in a clock- Wise and a counter-clockwise direction, of a toothed disc removably secured to said shaft, a latch arm, spring means for holding said arm in normal position, a paivl pivotally carried by said latch arm, and means for moving said pawl into engagement With said toothed disc when said disc is rotating in al counter-clockwise direction, said disc Ybeing adapted When rotated in a clockwise direction to engage with said patvl and move said latch arm out of normal position.

6. In a device of the type described, a toothed disc, a paWl, a Weight arm, said weight arm adapted to engage with said pavvl, a cam disposed in engagement with said weight arm, and means for moving said cam for raising said Weight arm into engagement with said pawl and for raising said pawl into engagement with said toothed disc.

7 A device of the type described comprisn ing a toothed disc, a latch arm, spring means tor holding said latch arm in normal position, a paWl rotatably mounted upon said latch arm, a Weight arm adapted to engage with said pawl, a cam disposed in engagement With said vWeight arm, and means for actuating said cam for raising said Weight arm into engagement with said pavvl and for moving said pawl into engagement with said toothed disc, said toothed disc being adapted to rotate in a counter-clockwise direction said disc being adapted when rotate ing in a clockwise direction to engage With said pan'l and movesaid latch arm out of normal position.

8. A device of the type described comprising a rotatable toothed disc, a latch arm, yieldable means tor holding said latch arm in normal position, a lever adapted to be held againstmovement by said latch arm when in normal position, means operatively connected to said lever for actuating a brake for stopping rotation of a cable drum When released by said lever, a paWl rotatably mounted upon said latch arm, a Weight armadapted to engage with said paWl, a cam disposed in engagement with said Weight arm, and means for actuating said cam for raising said Weight arm into engagement with said paivl and for moving said pavvl into engagement With said toothed disc, said disc being adapted When rotated in one direction to engage with said pawl and move said latch arm outof normal position `for releasing said lever, whereby said brake-actuating means will actuate said brake for stopping the rotation of said cable drum.

HENRY H. LOGAN.

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