US1802091A - Hoisting mechanism - Google Patents

Description

F. F. sr-:AMAN 1,802,091

HoIsTING MECHANISM Filed July 15. 1929 2 Sheets-Sheet 1 April 21, 1931..

ATTORN EYS Patented Apr. 21, 1931 f UNITED sfrfriszws` OFFI'CE., ii

FRANK F. sEaMAN, oF SPRINGFIELD, oIIIo, AssIGNoF. To RoBBINs'aMY'FRs, INC., oF f SPRINGFIELD, oIIIo, A CORPORATION oF oHIo IIoIsTING'MFGIIANIsM i' y' Application ined Jury 15, 1929. serial No. 378,263.

This invention relatesto'hoisting mechanism, it more particularly relating to mechanism of this character which employs an electrically driven power drum mounted in a frame supported above the load, together with a cable having its dead end anchored to' the frame and the other to the drum, and a load hook block carried by the cable.

.A diiiiculty encountered in this class of hoisting mechanism resides in the fact ythat the swaying motion of thel hook block as it ascends Vwith the load sometimes causes it to strike and catch some portion of the frame, prior to the contact withrthe automatic stopping mechanism for the motor, resulting in damage to the mechanism.

One of the objects of the invention is yto obviate the danger of breakage from'this source by so constructing the'frame and block as to cause the blockton freely pass the frame parts and be guided into contact withthe automatic stopping devices.

i A further object of the invention is-to provide a guide 'for the cableat a point adjacent the drum at times when the cable is dragging a load from a lateral position.

Another source of annoyance in rconnection with hoists of this type is the tendency of the coils of cable to climbl onthe drum, particularly durin fthe latter part ofthe winding operation, ue tothe increasing angle assumed by that part of the cable which is being wound resulting from the practice of anchorl ing the dead end of the cable at a point in line with the midway plane of the drum. While with this method ot anchoring the two or more strands of the cable stand at but a. slight angle to the drum at the beginning of the hoisting operation, yet this angle from the midway point constantly increases until during the later part thereof, the angle is considerable and frequently results in the coils of the cable climbing one upon another instead of following the groove of the drum.

Another object of the invention is to overcome this difficulty by so anchoringthe dead end of the cable that the angle of that portion of the cable being wound on the drum decreases as the load ascends, until near the end of the hoisting operation that portion of` the cable stands at avery the axis'of the drum andin fact at one point perpendicular to the drum. In the accompanying drawings:

(Fig. 1 is a front elevation o a hoisting device embodying my improvements. p y

Fig. 2 is a vertical section throughthe hook block, the section being on the line Q-Qof Fig. 1. Y p n A Fig. 3 is a top plan view of the hook block.'l Fig. 4 isa side elevation with the frame parts broken away and-shown in longitudinal section. A f Fig. 5 is a top plan view with the frame parts broken away' and shown in transverse section.k Y i The frame which supports the winding drum and its motor is indicated at 1,' this slight angle to fra-me being inthe nature of an enclosing o.

structure `which has a vertical longitudinally extending wall 2 and a pair of vertical transversely extending walls 3 which are apertured to receive the side flanges of the winding drum 4. The'frame is connected torand The winding drum is suitably mounted in the frame and is. geared kto an electric motor 8 also carried by the frame,y the vgearing (not shown) being of any well known speed reduction type mounted in the gearJ casing 9.

. The underside of the frame is provided with aV square openingl to accommodate the cable and hook block, the walls of this open-v ing beingv provided with ka depending outwardly fiared iiange 10 :for the'A purpose to be explained.

rIfhe hook-block is indicated at 11 and has journaled therein Ythe usual sheave4 12 about which passes the cable 13 and also has secured thereto7 the usual yload hook 14. vThe upper end of thishookW block is.r provided with tapered sides indicatedfat 15 and tapered strengthening ribs 15'.'V y y Intheoperation of this type ofhoisting mechanism, the hoist block near the ylimit of its.maximum hoistingumovement enters y the opening in the frame and Icontacts .with autoL l however it will be seen that by reason of `the flared flange depending from the wall of the opening, in connection with the tapered form of the upper end of the hook block, the Y block is guided freely into the opening and danger of breakage eliminated.

The dead end of the cable 13 in the present construction is secured to one of the bolts which fastens the frame to the trolley, this bolt being in the present case an eye bolt, indicatedy at 16, the eye being on the interior of the frame and having the cables securely fastened thereto. The cable passes through the interior walls of the frame so as to bring it in line with the opening and has its other end tied to the drum. As shown in Fig. 4 the dead end of the cable is so anchored that it hangs adjacent that end of the drum which receives the final coils or windings of the cable. As a result of this arrangement that Q portion of the cable whichris being wound upon the final portion of the drum when the hook block is approaching the utmost limit of its hoisting movement, will stand at but a slight angle to the axis of the drum instead of at a pronounced angle thereto as would be the case if the dead end of the cable was anchored at a lpoint midway the length of the drum. This arrangement, as previously explained obviates the annoyance of the coils $0 or windings of the cable tending to climb one I' upon the other and insures that the cable follows the groove of the drum to the final limit of its winding movement.

Having thus described my invention, I t? claim:

v1. In a hoisting mechanism, a supporting ,frame located above the load having a lower opening, a cable depending `from said frame through said opening, a hook-block on said cable, means carried by the frame for hoisting i the cable and block, and guide means for said block arranged about said opening.

f2. In a hoisting mechanism, a supporting frame located above the load having a lower @5 o nin a cable depending from said frame tllioug said opening, a hook-block on said cable, means ycarried by the frame for hoisting the `cable and block,and guide means for said block arranged about said openiiig,said hook 50 block having a tapered upper end :to cooperate with said guide means.

f `3. In a hoisting'mechanism, a supporting frame located above the load having a lower a cable depending from said frame 0 c a ai@ Praise @beek-blad? en Said cable, means carried bv the frame for hoisting the cable and block, and a flared depending flange about said opening.

4. In a hoisting mechanism, a supporting fra-me located above the load having a lower openin a cable depending from said frame throng said opening, a hook-block on said cable, means carried by the frame for hoisting the cable and block, and a flared depending flange about said opening, said block having its upper end tapered to cooperate with said flaring flange.

5. In a hoisting mechanism, a supporting frame located above the load having a lower opening, a cable depending from said frame through said-opening, a hook-block on said cable, and means carried by the framel for hoisting the cable block, said hook-block having a tapered upper end to cooperate with the Wall of said opening to guide the block therethrough.

6. In a hoisting mechanism, an over-head supporting frame, a winding drum mounted thereon, a cable having its dead end anchored to said frame and its other end secured to said drum with the cable depending therefrom, the anchorage foi the dead end of the cable with said frame being adjacent that end of the drum which receives the final coils of the cable and above the horizontal plane of the axis of the drum.

'f'.ln a hoisting mechanism, an overhead supporting frame, a winding drum mounted thereon, a cable having its dead end anchored to said frame and its other end secured to said drum with the cable depending therefrom, a hook block on said cable, the anchorage for t-he dead end of the cable with said `frame being adjacent that end of the drum which receives the final coils of the cable and above the horizontal plane of the axis of the drum and in a vertical plane spaced from the drum a distance at least equal to the width of the hook block.

In testimony whereof, I have hereunto set my hand this 9th day of July, 1929.

FRANK F. SEAMAN.

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