I Oct: 1, 1946. 2,408,364 D. A. BENNETT ETAL ROTARY DRILLING UNIT Fileii March so, 1942 '7 2 Sheets-Sheét 1 U QQQ - I ENVENTOQRS» ' . QAN/El. A. BENNETT 2,408,364 Patented Oct. 1, 1,946 ‘STAT ' ES J r PATENr'oFFlcE, . ‘ 2,408,364...‘ ' ROTARY DRILLING a; Daniel A. Bennett and Augusta. Meier, Oil City, .-I_'a., assignors to Oil Well; Supply. Company, a .. ' corporation of New Jersey ] Application March so, 1942, Serial No. 436,908 -1 Claim. (01. 255-119) 2 of the hoist as by means of a belt drive 3 and driving a slush pump D through a belt drive 4. The hoisting unit B includes a rotary drive shaft 5, line shaft 6 and drum shaft 1. The rotary drive shaft 5 may be driven from the jack shaft 2 by a driving connection 8, and line shaft 6 may be driven from said jack sha’ftby drive 9, the lineshaft driving the drum shaft through a taryvdrilling units of the character comprising a rotary and a prime mover directly driving said rotary. : V ‘ ' ' ~~While drilling units of the character stated are generally suitable for their intended purpose, it is ‘sometimes desirable or necessary to provide for auxiliary or emergency drives 'to or from said 5unit, as when power failure occurs, either by fail ure of 'the'prime mover of the drilling unit or of the prime mover of the hoisting apparatus of the drilling rig. Various means have been provided heretofore ‘for such purposes, but the same have certain disadvantages as hereinafter pointed out. 2 by‘a prime mover C connected .to the jack shaft “Q-This invention relates to'improvements‘ in ro connecting drive. l0. - The said. interconnecting ' drives of the hoisting unit are diagrammatically illustrated, since such drives are well known and understood in the art. . , r The drilling unit A is mounted upon a pair of , ,For example, separate auxiliary sprockets and 15 skids or supports H, and includes a prime mover chains have been provided for emergency drives to and from the drilling, unit, together with clutches and the like for engaging said drives. ‘While such devices will effect the ultimate result desired;-they~are cumbersome-and expensive, and 20 ig'enerally'involve considerable delay in connecting "tervalswhen‘they are not being used forauxiliary converter, diagrammatically indicated at T. The wear and power cost, and presenting a constant hazard "and source of injury to men and app-a - ’ -' 1 transmission connecting means or shafting be tween the prime mover and the rotary shaft 12 is interrupted at two spaced intervals, at which -.intervals, suitable separable couplings l3 and M are provided. Said couplings are preferably of the type providing for shaft misalignment and pos sessing the capacity to be quickly engaged and disengaged. For example, couplings of the cut I -The principal object ‘of our invention is to eliminate the-complexity and numerous parts of such auxiliary or emergency drives to enable ef ?cient and immediate power transmission to or’ from the drilling unit when desired. drilling unit, whereby a separate drive or power transmission is provided to or from the drilling uni-t. The rotary shaft I2 is connected with the when employing an internal combustion engine for said prime mover, in which case the power of the engine E is transmitted through a torque " or emergency purposes, producing unnecessary ‘ an auxiliary or-emergency driving means for said prime mover E through a reduction gear F, as ‘and disconnecting the same. Further, they must be driven at all times, including the greater in ratusr E connected with and driving the rotaryR. The present invention has to do with the provision of ‘ Our invention contemplates the employment of a single auxiliary or emergency drive connection 35 out type may be employed, one of which is shown in detail in Fig. 2. between the drilling unit and other powered ap paratus, as for example, a hoisting unit, which drive will remain inactive when not in transmis sion of power, but which may be instantly en gaged or disengaged when desired. 40 ment I6 is keyed to the connecting shaft H, the latter shaft being separate from the rotary shaft and forming a connecting element with the prime Additional objects and advantages will become apparent from the following description taken in mover E through the reduction gear F. A hous connection with the accompanying drawings, wherein: Fig. 1 is a plan view of a rotary well drilling ap ing l8 encloses the gear elements I5 and I6 of 45 the coupling, said housing including internal gear paratus including a drilling unit embodying our invention; Fig. 2 is an enlarged sectional view taken on the line 11-11 of Fig. 1; and Figs. 3, 4 and 5 are diagrammatic views-illus 50 trating the three operating conditions provided by our invention. ‘ . ' The couplings as shown each include a gear element l5 secured to one shaft, as the rotary shaft I2 in coupling l3, and a similar gear ele portions lsadapted to. mesh with the said gear elements when the coupling is in connecting or’ transmitting position, which position is shown in full lines in Fig. 2, ‘ To disengage the said coupling the housing I8 is moved longitudinally to the left in Fig. ‘2, thereby disengaging the gear elements l5 and I6, and preventing transmission of power between Referring to the drawings, Fig. 1 illustrates a the shafts l2 and IT. A set screw 20 is mounted rotary well drilling rig including a drilling unit A and a hoisting unit B, the latter being powered 55 in the housing l8 and extends into cooperative ' 2,408,364 , r ' 3 4 position with respect to an annular collar 21 on the gear element l5, said set screw functioning to retain the coupling in engaged or disengaged position by preventing longitudinal movement of the housing with respect to said annular portion E. The sprocket 23 is shifted to engage the spline 22—-24, whereupon the sprocket 23 and its chain the rotary drive shaft 5, from whence the power may be transmitted to and from the hoisting unit and the gear elements from one position to the in accordance with the transmission facilities of other, it only being necessary to withdraw said set screw out of interfering position with the annular portion 2| in order to actuate the cou pling in the manner described. While shifting means may be connected with, the housing l8 if desired, the housing is readily and easily slidable in relation to the gear ele that unit. Fig. 5 illustrates the operation-of our invention 21 are driven from the prime mover E to drive for an auxiliary or emergency drive from the hoisting unit or other powered external means to the rotary. For such operation, the coupling [3 is in engaged or transmitting position and sprocket 23 is connected to its shaft by the spline ments l5 and [6, so that the same maybe moved means 22--24, with coupling M in disengaged or by hand when actuating the coupling to engaged, non-transmitting position, whereby the power applied to chain drive 2'l--23 by the hoisting unit, is transmitted directly to the rotary R. or disengaged position. Mounted on the shafting between the couplings l3 and Hi, we provide an auxiliary drive means including a spline collar 22 secured to the con-. necting shaft I1, and a sprocket or drive member 23 freely rotatable on said shaft, said sprocket having an internal spline portion 24 adapted‘ to engage the spline collar 22, A shifting collar 25 is provided for the sprocket 23, said collar being ‘actuated by a shifting lever26 mounted on‘the ~ drilling unit. Sprocket or drive means 23 may be connected .by a chain 2'! with the hoisting unit B, as by means of a dual idler sprocket 28 freely rotatable on the drum shaft 1 of said unit, the dual Hence, it will be seen that we have provided a simple‘ and efficient auxiliary or emergency drive to or from the drilling unit, employing a single auxiliary driving connection between said drill- . ing unit and another power unit, which‘ connect ing drive remains inactive during the operation of either or both of said units in their conven tional manner. The structure so provided is both simple and durable, the parts of said auxiliary drive remaining inactive during the greater pe riods of time when the drilling and hoisting units are being operated separately, thereby saving in power cost and wear upon the parts of the mech sprocket 28 being connected with the rotary-drive anism, and materially reducing the hazard o shaft 5 by a chain drive 29, whereby the power of either the drilling or hoisting units may be inter changeable for auxiliary or emergency driving injury to men and apparatus. purposes. ‘ Various modi?cations and changes are contem plated within the scope of the following claim. We claim: The operation of our invention is illustrated in In a rotary drillingwunit, the combination with Figs. 3, 4 and 5. Fig. 3 illustrates the position of the mechanism when operating the drilling unit a rotary, of a prime mover therefor, connecting shafting between said rotary and prime mover, A in the conventional manner to drive the rotary and an auxiliary drive for the transmission of R by, means of the prime mover E-, couplings l3 40 power to and from the unit comprisingapair of and M being in engaged or transmitting position, spaced couplings disposed in said,‘ connecting and sprocket 23 being free upon the shaft II. In shafting and adapted to separatelyinterrupt the such position, the rotary is driven without the transmission of/power from the primemover to transmission of power or motion to the single the rotary, a transmission member freely rotat ~11) auxiliary or emergency drive sprocket 23 and able on the portionof said.connectingzshafting chain 21. between said couplings, and means for selectively Fig.4 showsthe apparatus'in position" for aux connecting the transmission. member- to said: por iliary ‘or emergency drive to the hoisting‘ unit, in tion of the connecting shafting. whichcase, the coupling l3 is disengaged,‘ thereby DANIEL 'A, ‘BENNETT. disconnecting the. rotary R from its prime mover 50. AUGUST R. . MAIER.