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ATTORNEYS March 6, 1951 T Mareh 6, 1951 T. o. DAVIDSON ETAL 2,543,765 wmcn FOR convsmmua DRAGLINES AND SHOVELS Filed Feb. 5, 1947 6 Sheets-Sheet 1 BY 4' ATTORNEYS March 6, 1951 T. o. DAVIDSON ETAL 2,543,765 wmcu FOR CONVERTIBLE DRAGLINES AND SHOVELS Filed Feb. 5, 1947 6 Sheets-Sheet 2 .59 4/40 .75 ' ATTORAGE‘Yi March 6, 1951 T. o. DAVIDSON ET AL 2,543,755 WINCH FOR CQNVERTIBLE DRAGLINES AND SHOVELS Filed Feb. 5, 1947 6 Sheets-Sheet 3 76 ‘32 74 74 49 7 £3 47 62 II:- I: W 7a’ 3 74 74 1 686.5’ 69 50 v’ 48 J2 49 a a 5/ H , l ' éz‘; I 59,-. ism"? 7’ ATTORNEY-5' March 6, 1951 'r. o. DAVIDSON ETAL 2,543,765 WINCH FOR CONVERTIBLE DRAGLINES AND SHOVELS Filed Feb. 5, 1947 6 Sheets-Sheet 4 ATTORNEY.’ March 6, 1951 ‘r. o. DAVIDSON ETAL 2,543,755 wmcu FOR convaansus DRAGLINES AND SHOVELS Filed Feb. 5, 1947 6 Sheets-Sheet 5 M “amid/4m. mmvroas, 2% 2,5 ‘ ATTORNEY. March 6, 1951 -r. o. DAVIDSON ETAL 2,543,765 wmcn FOR convamxau-z nmcu‘m-zs AND SHOVELS AZTORJVEYI Patented Mar. 6, 1951 2,543,765 UNITED STATES PATENT OFFICE 2,543,765 WINCH FOR CONVERTIBLE DRAGLINES AND SHOVELS Trevor 0. Davidson, Milwaukee, and Bruno L. Lonngren, South Milwaukee, Wis., assignors to Bucyrus-Erie Company, South Milwaukee, Wis., a corporation of Delaware . Application February 5, 1947, Serial No. 726,570 19 Claims. (CL 254—185) 1 Our invention relates to new and useful im Rope thrusting eliminates the need of a boom provements in the control of thrusting and hoist engine to drive the shipper shaft, and thus not ing functions of power shovels, and the control only thereby reduces the weight on the boom, ' of dragging and hoisting functions of draglines but also reduces the weight of the boom itself by more particularly power shovels and draglines of enabling it to be built lighter. But, of course, the friction type, so called because operated .by these same advantages could be attained by a a constantly running motor (usually either gaso; ‘ sprocket chain drive up the boom from the main line, Diesel, or electric) which performs the vari engine to the shipper shaft. ous operative functions through friction clutches. The rackless typeof rope thrust still further This present application is a continuation-in 10 reduces weight, because by its greater ?exibility part, i. e., a continuation as to all common sub as contrasted with rigidity, it enables the boom to ject matter, of our copending patent application, ‘ be built lighter still. But, of course, this same ?led December 30, 1944, Serial No. 570,610, which advantage could be attained by using a two was abandoned, without prejudice to this pres rope drive in place of the sprocket chain, racks, ent application, on September 13, 1948. 15 and pinions. Ever since the wo-rld’s ?rst steam shovel, de The desirability of reducing the ' front end scribed in U. S. Patent No. 1089, issued to Wil weight as much as possible is due to saving in liam S. Otis, digging by the conventional power structural cost, reduction of need for counter shovel has involved two movements,‘name1y: mo weighting, and reduction of swinging inertia. tion in a circle about a point (known as the ship 20 From the foregoing, it will be seen that the ad per shaft) ‘ approximately halfway up the boom, vantages (thus far listed) of the two types of which motion is known as hoisting and lower rope thrust are paralleled by two types of positive ing; and motion in a circle about the outer end thrust. But other advantages, not thus paral of the boom, which motion is known as thrust leled, will be discussed later herein. ing, or crowding, in and out. Strictly speaking, 25 In all types of rope thrust, the dipper auto the curve of each motion is an involute, but the matically falls during thrusting out, and rises circle which serves as the evolute of each in during retracting, except insofar as these tend volute (in the one case the shipper-shaft pinion, encies are offset by intentionally hauling in or and in the other case the boom-point sheave) is paying out the hoist rope. The ratio of the hoist so small that for purpose of the present discus 30 motion of the dipper, in proportion to its thrust sion we can treat the involute as approximately motion, depends upon the number of hoist a circular arc. reaches in the hoist rope, and (in the rack va-' Rope-thrusting, so-called, was ?rst shown and riety) the ratio of shipper-shaft drum diameter described in U. S. Patent No. 1,430,298, issued to pinion diameter, or (in the rackless variety) September 26; 1922, to Walter Ferris and Svante 35 the number of thrust reaches in the hoist rope. R. W. M. Bager. This epoch-making principle When thrusting out with a rope-thrust shovel, involves dead-ending the hoist cable on a drum the drop of the dipper can be partially offset, keyed to the shipper shaft, and engaging racks on the dipper handle with pinions keyed to the wholly oifset, or more than offset, by clutching shipper shaft. Thereby thrusting out is effected the hoist drum to the winch engine, and then eas solely by the weight of the dipper and contents ing out the thrust-control rope at various appro (supplemented, when hoisting with the dipper priate rates of speed. hooked into a bank, by the downward reaction When retracting, the natural rise of the dip of the bank on the dipper) acting" to impose ten per can be enhanced by clutching the hoist drum sion in the hoist cable. Thrusting out is con 45 too. ' trolled, and thrusting in is effected, by a second Let us now consider the relative control and cable extending from the main winch on the characteristics of a positive thrust and a rope main works on the shovel to the shipper shaft thrust. drum. The advantages which inhere in a rope Taking into consideration the fact that we thrust shovel will be discussed later herein. 50 have a constant-speed one-direction motor, we In a variant known as rackless rope thrust, the have in a positive thrust shovel the following ?ve hoist rope imparts its‘tension directly to the dip digging motions to select from: per handle, rather than through the shipper 1. Pure hoisting, in a circular are about the ‘ shaft drum, pinions, and rack. This variant is shipper shaft. shown, for example, in U. S. Patent No. 1,564,791, 55 2. Pure thrusting out, in a circular are about issued December 8, 1925, to Roger Sherman Hoar. the point of the boom. 7 2,548,766 3 4 3. The resultant of pure hoisting‘ and pure Our in rention consists in the novel parts and thrusting out. in the combination and arrangement thereof, 4. Pure retracting, in a circular are about the which are de?ned in the appended claims, and ' point of the boom. of which three embodiments are exemplified in 5. The resultant of pure hoisting and pure re the accompanying drawings, which are herein tracting. after particularly described and explained. Note that, in a positive-thrust shovel, although DESCRIPTION OF FIGURES the paths of the two resultants can to some extent be selected by proper rope ratios, and drum Figure 1 is a side elevation of our shovel, some and gear ratios withinthe main winch, yet the 10 what conventionalized. selections are discrete (except insofar as clutch Figure 2 is a plan view of the main machinery slipping is resorted to), and once selected are of our shovel. Those parts of the machinery ?xed unless and until the machine is recon which are not involved in our invention have structed. been omitted to simplify the showing. Furthermore, in a positive thrust shovel, the 15 Figure 3 is an enlarged section of the drum resultant of pure hoisting and pure thrusting out and its associated mechanism showing the ?rst has a much greater speed than either of the com embodiment of our invention, taken along the ponents alone, due to the fact that full engine lines 3-3 of Figure 2. speed is contributing twice to the speed of the ‘Figure 4 is’the same section, showing the same dipper, namely once through the hoist rope, and 20 embodiment converted into a dragline. once through the crowd machinery. This phe Figure 5 is a section, taken along the lines.5—5 nomenon either reduces both controllability and of Figure 3. digging force in heavy digging, or reduces speed Figure 6 is an enlarged section of the drum and in the spotting part of the cycle. its associated mechanism showing the second In a rope-thrusting shovel (inasmuch as brake 25 embodiment of our invention, taken along the slipping is more controllable than clutch slip lines 6-6 of Figure 9. \ ping), there is the advantage that an in?nite Figure 7 is the same section as Figure 6, show gradation of paths can be chosen during com ing our second embodiment converted into a con bined thrusting out and hoisting. But, more im ventional dragline. portant, the engine is contributing to the com 30 Figure 8 is a section, taken along the lines 8-8 bined motion through only the hoist rope, and of Figure 6. therefore the speed of the combined motion is Figure 9 is an enlarged section of the drum and practically merely that of pure hoisting, which its associated mechanism, showing the third can accordingly be adjusted to exactly the opti embodiment of our invention.
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