US1623147A - Hoisting machine - Google Patents

Description

1623147 April 1927 A. H. WILSON HOISTING MACHINE Filed y 10, 1926 2 Sheets- Sheet '1 I Apr 1l 5, A. H. wlLsoN HOISTINQ MACHINE 2 Shoots-Sheet z tymab.

Patented Apr. 5, 1927.

UNITED STATES PAT ENT OF F I -CE.

ALEXANDER H. WILSON, F oAK PARK, ILLINOIS, ASSIGNOR T0 THOMAS ELEVATOR COMPANY, OF CHICAGO, ILLINOIS, n CORPORATION or ILLINOIS.

I-IOISTING MACHINE.

Application filed May 10,

This invention relates to hoisting machines, having reference more particularly to machines of the type designed for use in building operations to elevate building material to the several floors of a building underconstruction. More specifically, the'invention relates to that type of building material hoists which employ a pair of lifts operated by a single cable so as to have alterio nating service and return movements, and equipped withboth automatic and manual controls.

In an. application filed by me on July 20, 1925, Serial No. 414,672, I have disclosed a hoisting machine of the above noted type; and one object of my present invention is to provide an improvement on the machine of the said application. More specific objects are, to provide an improved automatic stop mechanism for effecting the arrest of the loaded lift at the desired story which, by a very simple and quick adjustment, may be made to operate at either the top story or any intermediatestory, and to provide an automatic stop mechanism which will be free from all danger of overthrow;that is, will arrest the rising movement of the loaded lift without also reversing the direction of movement of the hoisting cable. 3 Other objects and attendant advantages of the invention will be apparent to persons skilled in the art as the same becomes better understood from the following detailed description, taken in connection with the accompanying drawings wherein I have illustrated a practical and approved embodii'nei'it of the invention, and in which Fig. 1 is a fragmentary broken elevation of the lifts or cages and their supporting and guiding means and detent mechanism, showing also my improved auton'iatic stop mechanism, as viewed from the left of Fig. 8;

Fig. 2 is a fragmei'itary elevation ofthe automatic detent mechanism;

F ig. 3 is a central vertical section, taken on the line 3--3 of Fig. 1;

Fig. 4 is a top plan view;

Fig.'5 is a horizontal section on the line 55 of Fig. 1;

Fig. 6 is alongitudinal section, on the line 6+6 of Fig. 7, of thestriker adjustable on and lengthwise of the hoisting cable;

Fig. 7 is a. horizontal section, on the line 7--7 of Fig. 6,of the said striker.

1926. Se'ria1 No.,107,8 37.

Referring to the drawings, and 'firstbrief ly describing structural features of-an elevator of this type which are commonpractice, '10 and 10 designate two pairs of vertical upri hts erected side by side and constituting guides for a pair of lifts or cages 11, 11, respectively. The cage-supporting and guidingframeis mounted. on a base (not shown) commonly rested on the basement floor of the building; and the upper ends of the uprights 10 andlO arerigidly connectedand spaced by a pair of horizontal beams 12. J ournaled in bearings 13 on the beams 12 are a pair of cable-supporting pulleys 14, 14, on corresponding faces of which are mounted circular ratchets 15, 15. A single continuous hoisting cable 16 is connected at one end to the upper cross-beam of the cage 11, extends thence over the pulley 14, thence downwardly and beneathan idler pulley 17 (Fig. 3) at the'bottom ofthe frame, thence laterally of the elevator frame to and several times around the winding drum of a hoisting machine (not shown), thence back beneath a second idler pulley similar to the pulley l7, thenceupwardly and over the supporting pulley 14, with its other end attached to the upper cross-bar of the cage 11; the length of the'cable being such that when one cage is in its lowest position the other cage will beat the highest position required by thecondition of the work. Thehoisting machine for operating the hoisting cable 16 includes, in addition to the winding drumreferred to,.clutch-controlled mechanism for rotating the winding drum in either direction, and brake mechanism for locking the winding drum against rotation in a neutral position when it is out of clutch with both its driving mechanisms; a hoisting machine of this type being disclosed in my former Letters Patent herein: above referred to.

In the aforesaid hoisting machine,the clutch shifter controlling the opposite drives and the neutral position of the winding drum is itself actuated by a rotatable cam fast on a cam shaft, which. cam shaft car-v ries a pulley around which is wound one or more times a controlling cable'. 18,,the two limbs of this cable passing beneath idler pulleys 19 at the base of the frame and extending thence upwardly and around l'.pL1lley 20 fast on one end of a central transverse rock shaft 21 (Fig. 3,) journaled'be- Til tween the cage-supporting pulleys 14, 14 in suitable hearings on the top crossbars 12; the cable 18 being fastened to the periphery of the pulley 20 as by a staple 22. On the other end of shaft 21 is a pulley 23, to the periphery of which is attached a cord or chain 24, the depending limbs of which are attached respectively to a pair of handle levers 25 and 26 that project at right angles to the plane of the frame and are fulcrumed at their rear ends on a pin 27 mounted in the lower ends of a pair of depending brackets 28 attached to one of the supporting bars 12. lVhen both of the handle levers 25 and 26 are horizontal, the hoisting machine clutch is in intermediate or neutral position. When one handle lever is depressed, the controlling cable 18 is actuated in one direction to shift the clutch and rotate the winding drum in one direction, the other handle lever being sin'niltaneosuly raised above the horizontal position. lVhen the other handle lever is depressed, the clutch is shifted in the reverse direction, thereby rotating the winding drum in the reverse direction. Hence, when one of the handle levers 25 and 26 is depressed, the hoisting cable 16 elevates one of the cages and simultaneously lowers the other; and when the other handle lever is depressed, the hoisting cable actnates the cages in the reverse direction.

The apparatus is also equipped with a safety dogging device operating automatically to prevent the possibility of accidental descent of a loaded cage the instant its as cending movement is arrested. This mechanism is shown in detail in Fig. 2, and comprises a pair of dogging pawls 29 and 30 pivotally mounted on one of the cross-bars 12 and co-operating with the ratchets 15 and 15, respectively. These dogs are provided with rearwardly extending tail pieces 29 and 30, the free ends of which, in the neutral position of the shaft 21 (which corresponds with the neutral position of the clutch of the hoisting machine) underlie the two ends of a segment plate 31 that is fast on the shaft 21. hen the shaft 21 is rocked to throw in the clutch and elevate one of the cages, the dog pertaining to the safety ratchet of that cage is thrown out by the end of the segment disc 31 striking and depressing the tail of the dog, as shown at the left of Fig. 2; the other dog riding idly over its ratchet which is turning relatively in the opposite direction. lVhen the loaded cage has reached its destination, the dog guarding the other ratchet acts instantly by gravity to arrest its descent.

The apparatus as thus far described is substantially identical with that disclosed in my former Letters Patent above referred to; and I will now proceed to describe my present improvement. consisting of an automatic frame are a pair of shafts 33 and 34.

mechanism for actuating the controlling cable 18 to throw the hoisting machine clutch to neutral position and thus arrest winding movement at the instant the loaded cage reaches its destination.

Jonrnaled in a pair of bearing brackets suspended from the cross-bars 12 of the Fast on these shafts are a pair of oppositely er;- tcnding arms 35, 86, the outer ends of which are connected by links 37, to the arms of all-shaped yoke 351 that is fast on the shaft 21. Also fast on the shafts 33 and 34 are a pair of oppositely extending arms 40, 41 disposed below and at an acute angle to the arms 35, 36 respectively and formed at their free ends with laterally extended lugs 40, 41. Arms and 41.) with shafts 83 and arms 36 and 41 with shaft 34 thus constitute in effect a pair of elbow levers. Loosely pivoted on the shafts 33 and 34 are a pair of downwardly inclined arms 42 and 43, the free end portions of which are forked, as shown in Figs. 3 and 5, and straddle the hoisting cable 16, said arms being retained in relative sliding engagement with the cable by Toss-pins The upper or shank portions of the arms 42 and 43 lie beneath and in the vertical plane of the lugs 40, 41.

Adjustably clamped on the cable 16 at points a greater or less distance above the two cages are a pair of strikers 45, 46, each of which, as the loaded cage approaches its delivery position, strikes the lower free end of one of the arms 42 and 43, swinging the latter upwardly, and, through contact of the upper edge of the arm with its co-operating lug 40 or 41, raising the corresponding arm 40 or 41, rocking the corresponding shaft 33 or 34, and through the arms 35 and 36 and links 37 and 38, and yoke 39, IOClilIlg the shaft 21 and thereby actuating the controlling cable 18 to throw out the clutch of the hoisting machine and so arrest the winding action of the hoisting cable. At this instant the brake of the hoisting machine and the safety do 29 or 30 iiistantly become active to hold the loaded cage in its arrested position. This action at the same time raises one of the handle levers 25 and 26 and simultaneously lowers the other until both stand side by side in neutral position. To reverse the movement of the hoisting cable, the appropriate handle lever is depressed, and on the elevation of the other cage, the automatic stop mechanism on that side operates in the manner already described. A detailed structure of the strikers 45 and 46, which in practice has proved highly efficient, is illustrated in Figs. 6 and 7, and comprises a pair of co-operating cable grips or clamps, one of which consists of a body 47 formed with integral apertured side flanges 48 and a longitudinally and transversely concave groove 49 in its face forming a cable seat, and the other consisting of a body formed with integral apertured side flanges 51 and on its face with a longitudinally convex rib 52 having a transversely concave groove 52 adapted to press the cable into the seat 49 through the agency of clamp bolts 53 passed through the flanges of the two clamp members. This construc tion grips the cable very tightly by reason of putting a kink in the latter. By loosening or withdrawing the bolts 53, the device can be adjusted to difierent positions on the cable.

In an automatic stop of the general character above described, experience has shown that an unduly rapid or accelerated movement of the mechanism must be avoided to prevent over-throw that is, a movement of the parts beyond neutral position, which would throw into operation the reverse drive of the hoisting cable. The apparatus herein shown, through the use of the comparatively long actuating arms 42 and 43 operated by buttons or strikers on the hoisting cable itself, reduces the speed of the controlling cable relatively to the speed of the hoisting cable and the cages, and thus avoids the faulty operation above referred to. It will also be observed that, by actuating the arms 42, 43 from buttons or strike-rs 011 the hoisting cable itself, the mechanism can be adjusted to automatically arrest the loaded cage at any story desired by simply adjusting said buttons or strikers to proper positions on the hoisting cable above each cake.

I have herein shown and described one practical and approved physical embodiment of the operative principle underlying the present invention, but it is manifest that the structural details and arrangement thereof may be widely varied without departing from the substance of the invention or sacrificing any of the advantages and utilities thereof; and hence, I do not limit the invention to the specific mechanism herein disclosed for purposes of illustration, but reserve such variations, modifications and mechanical equivalents as fall within the spirit and purview of the appended claims.

I claim 1. In a hoisting apparatus of the character described, the combination of an upright frame, cages guided in said frame, pulleys mounted on said frame, a hoistin cable connected to said cages and guided over said pulleys, mechanism including a control cable for starting, stopping and reversing the movement of said hoisting cable, manually operable means for actuating said control cable, and automatic means, including strikers movable with and at the speed of said cages, for actuating said control cable and thereby arresting upward travel of said cages, said automatic means being operative to move said control cable at a reduced speed relatively to that of 3. In a building material hoist, the combination of an upright frame, cages guided in said frame, pulleys mounted on said frame, a hoisting cable connected to said cages and guided over said pulleys, mechanism for starting, stopping and reversing the movement of said hoisting cable including a rock shaft journaled on said frame, a pulley fast on said rock shaft, and a control cable passing over and secured to said pulley, manually operable means for actuating said rock shaft, strikers mounted on said hoisting cable above said cages, a pair of arms pivoted at their inner ends on said frame and at their outer ends straddling said hoisting cable above said strikers, whereby said arms are adapted to be raised by said strikers, and mechanism operated by said arms on their rising movement for actuating saidrock shaft.

4. A hoisting apparatus as defined in claim 3, wherein the manually operable means for actuating the rock shaft consists of a pulley fast on the rock shaft, a pair of handle levers coaxially pivoted on the frame. and pull cords connecting the periphery of said pulley with said handle levers, said parts being so associated that the lowering of either handle lever simultaneously raises the other.

5. A hoisting apparatus as defined in claim 3, wherein the mechanism operated by the arms on their rising movements for actuating the rock shaft consists of a generally U-shaped yoke fast on the rock shaft, a pair of elbow levers pivoted beneath sald rock shaft, links connecting the upper arms of said elbow levers with the arms of said yoke, and contact pieces on the lower arms of said elbow levers adapted for enga ement by the striker actuated arms on tie rising movements of the latter.

ALEXANDER I-I. IVILSON.

Images