US1549736A - Governor for elevators and the like - Google Patents

Description

gwuentot HARoLb V McConmcn.

2 Sheets-Sheet l Filed Feb. 25.

H V MccoRMlcK GOVERNOR FOR ELEVATQRS- AND THE LIKE' Aug., 1l, 1925v Aug. 11, 1925. w 1,549,736

H. V. MCCORMICK I GOVERNOR FOR ELEVATORS AND LIKE Filed Feb. 25. 1924 l2 sheets-sheet 2 Amal/11110110, 4| l Patented Aug.. 11, 1925.

UNITE STATES PATENT QFFICE.

HAROLD V. MGCORMICK, OF CINCINNATI, OHIO, ASSIGNOR TO THE WARNER ELEVATO'R MANUFACTURING' COMPANY, 0F CENCINNATI, CII-H0, A CORPORATION 0F OHIO.

GOVERNOR EUR ELEVATORS AND THE LIKE.

Application filed February 25, 1924. Serial No. 695,122.

To all who/n it may concern.'

Be it known that HAROLD V. MCCoRMIom a citizen of the United States of America,

and a resident of 3110 Woodburn Ave., Cincinnati, in the county of Hamilton and State of Ohio, has invented a new and useful lmprovement in a Governor for Elevators and the like, of which the following is a spec1- cation.

An object of my invention is to provide a governor that may be used with elevator cables and the like, that is simple in construction and operation.

Another object of my invention is to pro- 15 vide a device for the purpose stated, that is provided with double checking means that may be successively brought into play should an elevator or the like pass from the control of the operator.

These and other objects are obtained by means described herein and disclosed in the accompanying drawings, in which:

Fig. 1 is a front elevation of a governor embodying my invention.

t Fig. 2 is a sectional view on line 2-2 of Fig. 1.

Fig. 3 is a sectional view on line 3-3 of Fig. 1.

Fig. 4 is a side elevation of the device shown in Fig. 1, parts being broken away.

Fig. 5 is a sectional view on line 5 5 of Fig. 4.

My device comprises a base 6 that may be mounted above an elevator shaft, as shown, and comprises upwardly extending arms 7 and 3 that rotatively support a pulley 9 about which a cable 10 connectedv with an elevator cab or the like may extend. rlhel pulley 9 has a circumferential groove 11 for the reception of the cable 10. The base 6 is provided with an aperture 12 through which the cable extends. A block 13 is carried by a lug 14 extending upwardly from the base 6. The block comprises a pair of spaced lugs 15 and 16 thereby providing a way 17 through which thecable 10 extends. The block carries Varms 13 and 19. The arms are provided with elongated apertures through which a pin 21 carried by lug 14, slidably extends. A spring 22 has its opposite ends in abutment upon the lug 14 and the body or intermediate portion 23 of the block 13. The walls of the apertures 20 limit the movement of the block 13. A locking arm 34 is pivotally mounted on the base 6 and has a free end 35 disposed adjacent the block 13. rlhe free end 35 is provided with a groove 36 for the reception of the cable 10. A. finger 37 is pivotally mounted on the base 6 and is pivotally connected with the arm 34 by means of a link 33. The arm 34 has formed on it a boss 39 that limits the movement of the free end of the linger 37 toward the block 13. The pivotal connections of the finger 37 and of the link 38 are such that when the parts are in the relation shown in Fig. 1 the weight of the arm 34 directed upon the link 33 and the linger 37 serves to retain the parts in the relation shown in Fig. 1. From the foregoing it will be noted that the said pivotal connections are normally out of alignment, and that the boss 39 serves as a stop against movement of the arm about such pivotal connections or mountings. lt will also be noted that if the finger 37 be actuated to move the free end thereof toward the pivotal mounting of the arm 34 on the base 6 the pivots 40, 41 and 42 will be brought into alignment whereupon the pivot 41 will move toward the left of the line passing between pivots and 42 whereupon the arm 34 may drop about its pivotal mounting 43 on the base 6. Vin/'hen the arm drops, the free end thereof is brought into clamping engagement upon the cable 10 against the yielding resistance of the spring 22. The arm 34 is made sufliciently long and the groove 36 is positioned in such manner that the said function is accomplished.

The means for actuating the finger 37 about its pivotal mounting 42 are carried by the pulley 9. rEhe pulley is provided with two pairs of spaced brackets 44. rllhese brackets extend away from theJ web 45 of the pulley on lines substantially parallel with the axis or shaft 460 about which the pulley may revolve. Each pair of brackets supports a shaft. These shafts are indicated at 46 and 47. The shaft 46 carries a weight 43 provided with a pair of arms 50 and 53, one of said arms, namely 50, being part of a bell crank lever 49. rlhe weight is pivotally supported on the pulley by providing bearings at the free end of arm 50 and at the junction of the arms of the lever 49 and which bearings accommodate the shaft '46. A similar weight 51 provided with a pair of arms 53 vand 59 of which 53 constitutes part of a bell crank lever 52, is in like manner supported upon the shaft Li7. rlille tree ends ot the bell crank levers Li9 and 52 are disposed adjacent one another and are pivotally connected by a link rlhe web l5 ot the pulley is provided with apertures 56 and 57 through which the arms 50 and 5S associated with weight e8, and arms and 59 associated with weight 51 extend. rlhe weights i8 and 51 are connected by a pair ot springs 62 and 63 that yieldingly retain the arms 50, 53, 58, and 59 upon the seats. 641 and 65 formed on the walls of the apertures 56 and 57 through the web l5. The weights i8 and 51 comprise radially entending 'flanges that normally clear the finger o7. `When the pulley 9 is revolved atan excessive speed the weights are moved about their pivotal mountings on the shetts i6 and i7 and engage the finger 37 thereby causing the locking arm 34 to be dropped into binding engagement upon the cable 10. lt will be readily apparent that the adjustment ot the locking arm 34 and of the block 13 may be such that the cable 10 may be permitted to slide therebetween or to be securely clamped therebetween. rl`he arm 8 carries a switch box containing any suitable switch mechanism such as shown in Fig'. 5. A lever 71 associated with the switch box is mounted on the stud shatt 72 and which shaft is pivotally supported by the switch box 70. As shown herein the means :tor mounting the switch box 70 comprises bolts 73 disposed horizontally on opposite sides o't the lever 71. The shaft 72 carries an electrical Contact 7 l that may establish electrical communication between the electrical brushes and 76. The brushes 75 and 76 are connected with a source of electrical supply conl trolling the normal movement of the cable 10. The lever 71 is provided with a boss 77 that may be engaged by the weights i8 and 51 for moving the lever and the shaft 72. The conductor block 74 and the brushes 75 and 76 are preferably constructed in such manner that movement of the lever 71 is yieldingly resisted. rlihis may be accomplished in any suit-able manner such as by making the brushes 75 and 76 of a yielding` nature such as by giving spring qualities thereto and by providing lugs 7 8 on the spring arms that may lodge in pockets or recesses 79 in the conductor block 7 Ll. The weights 18 and 51 are so disposed that the normal movement of the pulley will not cause engagement of the weights upon the boss 77. The relation of these parts is such that when the movement oi the pulley eX- c'eeds a predetermined rate, the lever 71 will be actuated for breaking the electric circuit embracing the brushes 75 and 76 and the electrical conductors 8O and 81, thereby stopping the motor that controls normal movement of the cable 10. Should stopping ot the motor be ineffective for checking the movement oi' the cable 10 and the cab associated therewith, so that the movement o't the pulley 9 would Le further accelerated, the engagement the weights upon the finger 37 will bring the arm 3e into operation as previously explained. rEhe rotatory movement of the pulley J serves to move the weights outwardly against the yielding` action oi the springs 62 ano 63. rlhe movement ot the weights would be about the shat'ts 46 and Lt7. The connection ot the bell crank levert by means of link 5f-l, serves to equalize the movement oil1 the weights and to obviate any variation in such movement that might otherwise result trom inequality of the weights el@ and 51.

ln the operation oi" my device, the spring 63 serves to hold the weights in a retracted position while the pulley rotates at a normal rate et speed. The motor that wouldL move the cable 10 is in circuit with the electric switch associated with lever 71. Should the speed of the cable and pulley exceed a normal rate, the governor weights would be moifed laterally in relation to the plane ot rotation of the pulley and about their pivots e6 and 47 until the side edge ot one oi" the governor weights 46, 5i engages lever 71 thereby pushing the lever 71 betere and breaking the circuit through the switch. Grdinarily, this will bring the cable and pulley to rest. However, should the breaking ot the electrical circuit prove ineffective and the speed oi' the cable and pulley iiicrease iurther, the governor weights will be moved 'further laterally and the one governor weight would Contact and move betere it, the linger 37, thereby releasing the arm 34. rl`he arm then falls and cooperates with the block 23 in checking the movement of the cable. lt should be noted that the governor means rotate about a horizontal axis and that they are carried directly by the pulley. whereby a si nple and efficient structure is attained. lt should also be noted that the lateral movementof the weights t tripping the safety devices move laterally oi the plane of rotation of the pulley and that contact and tripping ot the switch inecnanism t not precipitate movement et the governor weights to a more extended .tion for actuating the cablegripping a 'furti er cable to 1 l,What i i* is:

1. ln a dmice oi"- the class described the combination ot a pulley, a cable engaging the pullmv and adapted to nieve therewith, an electr l switch tor controlling normal move rent o'f the cable about the pulley,

` l with the switch and con- 1.- iGil rolling lne tier: or el ctrical energy through the switch, normally inoperative means ior frictional engagement upon the cable and means carried by the pulley for successive y contacting of the lever for operating the switch and the normally inoperative means for frictional engagement upon the cable.

2. In a device of the class described thc combination of a base,V a pulley revolubly supported by the base, the pulley having a central perforated web, a pair of bell crank levers pivotally supported by the pulley on a common side of the pulley and each having an arm extending through the perfor-ations provided in the web, the bell crank levers being pivotally connected on that side of the pulley on which the levers have their pivotal mountings on the pulley, weights disposed at the ends of the levers extending through the perforations, means yieldingly connecting the' weights, an electrical switch, a lever associated with the switch and controlling the flow of electrical energy through the switch, a cable extending about the pulley and the normal movement of which iscontrolled by the flow of electrical energy through the switch, the lever and the weights being disposed in such relation that they may be brought into engagement for actuating the switch, means for frictionally engaging the cable and comprising a block, a pivotally mounted arm for cooperating with the block for frictionally restraining movement of the cable, the arm being normally inoperative for effecting frictional restraint upon the cable and a finger controlling movement of the arm to an operative position for frictional restraint upon the cable, the linger being adapted to be engaged by the weights upon movement of the weights about the pivotal mountings of the bell crank levers for rendering the finger inoperative upon the arm.

3.' In a device of the class described the combination of a base, a pulley revolubly supported by the base, a cable engaging the pulley for movement therewith, the pulley having a perforated central web, seats associated with the pulley, bell crank levers each having an arm extending through the web of the pulley and normally engaging the seats, the arms of the bell crank levers extending through the web having their opposite ends weighted and pivctally mounted upon the pulley, the weighted ends of the levers being on a common side of the pulley, a link pivotally connecting the bell crank levers on the side of the pulley opposite to the weights, means yieldingly resisting movement of the levers from engagement upon the seats, an electrical switch for providing a closed circuit when the pulley and cable move at a normal rate, a lever controlling the switch adapted to be engaged by the weighted ends of the bell crank levers upon separation of the bell crank levers from their seats, and means for frictionally restraining movement of the cable and comprising a block, a normally inoperative arm foil co-operation with the block for frictionally restraining movement of the cable and a finger normally retaining the arm in an inoperative position and adapted for engagement with the weighted ends of the levers whereby to render the linger inoperative upon the arm and to render the arm operative on the cable.

el. In a device of the class described the combination of a base, a pulley revolubly supported by the base, a cable for engagement and movement with the pulley, a pair of parallel spaced shafts carried by the pulley and disposed on a common side of the pulley, the shafts extending at right angles to the axis of the pulley, an arm and a bell crank lever pivotally mounted on each shaft, each bell crank lever having an arm extending through the pulley to the side of the pulley opposite from that side on which the shafts are disposed, each lever of one shaft having a pivotal connection with a lever on the` other shaft, weights carried by the arm and lever, mounted on a given shaft, the weights being disposed on the side of the pulley opposite to the side on which are disposed the shafts, yielding means connecting the weights, an elec trical switch through which electrical energy normally flows for the normal movement of the pulley and cable, a lever controlling the switch and extending into the path assumed by the weights when the pulley and cable move atan abnormal rate for breaking the flow of electrical energy through the switch, normally inoperative means for frictionally restraining movement of the cable, and means inthe path of movement of the weights about their mountings on the parallel shafts for controlling movement of the normally inoperative frictionally restraining means to an operative position after the weights pass beyond the lever con trolling the switch.

5. In a device of the class described, the combination of a pulley rotatable about a horizontal axis, a governor weight pivotally mounted on the pulley and movable about an axis parallel with the plane in which the pulley rotates and at right angles to the axis of rotation of the pulley, whereby the weight may move laterally of the pulley, means yieldingly resisting lateral movement of the governor weight, means for imparting rotary motion to the pulley and governed thereby, and a pair of trip devices for controlling the said means disposed in adjacent parallel planes for successive engagement of the governor weight as the governor weight is moved about its pivotal mounting.

6. In a device of the class described, the combination of a pulley rotatable about a horizontal axis, a cable movable about and with the pulley, an electric switch Afor controlling normal movement of the cable about the pulley, a cable-gripping device normally inoperative on a. cable moving about the pulley and governor Weights carried by the pulley for opening the switch upon movement of the cable and pulley in excess of normal speed and for rendering the cable-gripping device operative on the cable upon a. further increase of movement of the pulley and cable.

7. In a device of the class described, the combination of a pulley rotatable about a, horizontal axis, a cable movable about and l5 with the pulley, an electric switch for con trolling normal movement of the cable about the pulley, a cable-gripping device normally inoperative on a cable moving about the pulley andl governor Weights carried by the pulley and movable laterally of the plane of rotation of the pulley for opening the switch upon movement of the cable and pulley in excess of normal speed and for rendering the cable-gripping device operative on the cable upon a further increase of movement ot the pulley and cable.

In testimony whereof, I have hereunto subscribed my name this 8th day of February7 1924.

HAROLD V. MGCORMICK.

Images