US3250400A - Rotary crane with split race bull wheel - Google Patents

Description

May 10, 1966 R. F. BENNETT ROTARY CRANE WITH SPLIT RACE BULL WHEEL 5 Sheets-Sheet l Filed Oct. 26, 1964 .1 'JIA Q n n e B F. 1T P. e L@ R INVENTOR.

g WM5/f May 10, 1966 R. F. BENNETT 3,250,400

ROTARY CRANE WITH SPLIT RACE BULL WHEEL Filed Oct. 2G, 1964 3 Shee'bS-Sheet 2 May 10, 1966 R. F. BENNETT ROTARY CRANE WITH SPLIT RACE BULL WHEEL 5 Sheets-Sheet 5 Filed Gct. 26, 1964 Rober Bernlef" INVENTOR.

United States Patent O 3,250,400 ROTARY CRANE WITH SPLIT RACE BULL WHEEL Robert F. Bennett, 5915 N. Denver Ave., Portland, Oreg. Filed Oct. 26, 1964, Ser. No. 406,503 9 Claims. (Cl. 212-46) This invention relates to a new and improved crane, which is particularly adapted for heavy-duty materialhandling operations. The apparatus of the invention is characterized by a number of novel features rendering it easy to use, eiiicient, exible in operation, and generally reliable.

A crane as known to date typically may comprise a gantry standard or pedestal, and a boom at the top of the pedestal with load lines depending from the boom employed in lifting a load. While dierent types of cranes have been proposed, most are subject to a number of disadvantages. By way of example, in the usual whirly type crane, shifting of a load laterally of the crane is performed by swinging the cranes boom up or down, which has the effect of laterally moving load lines depending from the boom. This is a slower type of operation, however, than is possible were the load lines to be shiftable laterally by moving them along the length of the boom. The usual whirly crane can pick up a load positioned between rails supporting the crane and within the contines of its pedestal, only by moving the crane along the rails until it becomes positioned to one side of the load, and then swinging the boom over the load. This introduces clearance problems and again, time is consumed in making the necessary movements. In what may be referred to as a cantilever type crane, load lines are shiftable along the length of a boom in the crane, but most frequently the boom cannot be swung from side to side. Thus, to shift a load in a direction extending obliquely of rails supporting the crane requires lateral travel of the crane pedestal. The general construction characterizing a cantilever crane also tends to limit the size of any loads that can be handled with the equipment.

Generally, an object of this invention is to provide an improved crane which can be maneuvered readily to pick up loads positioned substantially anywhere.about the vicinity of the crane, and then deposit such loads at new locations.

Another object is to provide a crane which includes a boom swi-ngable about an upright axis, such boom also being adjustable by swinging the boom about a horizontal axis so as to raise the tip of the boom, and further comprises a trolley mounted on the boom having the usual load lines dependingV therefrom. With the organization, a load may he shifted from one position to another, using any of a number of selected combinations of possible movements in the crane. The crane movements selected may be the ones which produce th speediest and easiest repositioning of a'load.

A further object is to provide a crane with a boom which is swingable about a vertical axis, where the crane is constructed so that a load may be picked up from or deposited in a region located inside the contines of the gantry standard or pedestal in the crane, without rst moving the pedestal to one side of the region described. In other words, the construction is such that load lines in the boom are shiftable along a path to within the lateral confines of the gantry. standard. A related object is to provide such a crane, where the boom in the crane is swingable to raise or lower the tip thereof.

Yet another object is to provide a crane which includes a boom that is swingable from side to side and up and down, that further comprises a trolley mounted on the boom movable along the length of the boom, and a conice struction whereby such trolley may be moved inwardly on the boom to a region located within the confines of the pedestal, viewing the crane in plan.

The crane of the invention features a topping frame which swings backwardly to raise the b oom. The topping frame and the boom are both pivoted on a carbody, in a novel manner whereby maximum stability results .with the boom in Various positions. The carbody itself is revolvable about an upright. axis, through a circle gear and a pinion drive gear construction, powered by motors mounted on the carbody.

A further feature of the invention is the provision of a novel construction for the gantry standard or pedestal, accommodating the movement of load lines inwardly through the sides of the pedestal, the pedestal construction nevertheless possessing suitable strength. Also part of the invention is a novel mounting for the carbody, whereby it may revolve to swing a boom from side to side, and at the same time provide the necessary support.

The crane can handle a wide variety of load sizes. with the -boom in the crane swung upwardly at a relatively steep angle, maximum load sizes can be carried. With lighter loads, the boom in the crane may be placed in a position approaching a horizontal position, and the crane in this condition possesses maximum ilexibility with respect to the movements possible in the crane rand the area serviced by the crane.

Various other objects and advantages of the invention will become more fully apparent as the followingdescription is read in conjunction with the accompanying drawings, wherein:

FIG. l is a side elevation, illustrating a crane constructed according to an embodiment of the invention, such crane including a pedestal and a boom mounted on the top thereof;

FIG. 2 is a View, somewhat enlarged, showing the tip of the boom as the same is utilized in the handling of relativelyheavy loads;

FIG. 3 is `a cross-sectional View of the pedestal, somewhat enlarged, and taken along the line 3 3 in FIG. l;

FIG. 4 is a side elevation of the pedestal, as the same would be seen viewing from line 4 4 in FIG. 1, also drawn on a somewhat enlarged scale;

FIG. 5 is a View looking down at the ltop of the crane, with the boom removed, and showing a carbody in the crane, and its mounting on the top of the pedestal;

FIG. 6 illustrates, on a somewhat enlarged scale, portions of the crane including the carbody .at the top of the pedestal with `the boom in the crane set at a steep angle; and

FIG. 7 is a view taken along the line 7--7 in FIG. 6, on a larger scale than FIG. 6.

Referring now to the drawings, and irst of all more particularly to FIG. l, the crane illustrated comprises a gantry standard or pedestal 10, and mounted on the top of such pedestal (shown extending out horizontally and to the left thereof inFIG. l) a boom, indicated at 12. The particular `crane illustrated is a movable crane, in that the pedestal is movable along a defined path, and supporting the pedestal for such movement over the ground are rails or tracks 14, 16.

With reference to FIGS. 1 and 4, the base of the boom includes four legs, such as shown at 18, one being provided under each corner of the pedestal. As best seen in FIG. 4, connecting the legs above each track is a beam 20. Trucks, such as those shown at 22, are mounted under the legs and beam, and these include the usual wheels supporting the crane for movement along the tracks. Drive motors may be provided for selected ones of the trucks, indicated at 24, which power the wheels in the trucks whereby movement in the pedestal is produced.

As will hereafter become more fully apparent, the crane of the invention features a construction whereby load lines may be shifted laterally and inwardly through opposite sides of the pedestal, and such movement of the load lines is accommodated by providing upright gaps extending along opposite sides of the pedestal. More specifically, viewing the side of the pedestal shown in FIG. 4 (the side opposite being similar), and now also referring to FIG. 3, pedestal includes above legs 18 upright beams 26, 28, 30, and 32 which form four corners in the pedestal. Extending upwardly from beams 2) and the base of the pedestal are two sets of beams 34, 36, one set being located on each side of the pedestal, with t-op ends that arch toward each other. Extending upwardly from the tops of beams 34, 36, on the sides of the pedestal, are beams 29, 31. Cross beams 38 join the tops of beams v34, 36 with the upper ends of legs 18. Interbracing beams 34, 36 and the legs 18 are brace beams 40. Interbracing upright beams 29, 31 with beams at the corners of the pedestal are brace beams 42, and interbracingupright beams forming the corners of the pedestal, along a side such as illustrated in FIG. l, are brace beams 44.

In cross section, above legs 18, the pedestal appears as `shown in FIG. 3. Thus, at multiple levels in the pedestal,

horizontal beams 46, 48 are included, joined at ends to upright beams forming the corners of the pedestal. Beams 49, 51, 53 have outer ends secured to upright beams, and project inwardly to connections with a vertical pipe 50 which extends upwardly along the center of the pedestal. The pipe and beams connected to it serves to draw the entire structure together. I

With this construction, upwardly from beams at the base of the pedestal, a gap shown at 52 is `defined on each of opposite sides of the pedestal (between beams 29, 31 and beams 34, 36, as shown in FIG. 4). These gaps extend inwardly on the pedestal to the location of pipe 50.

Referring now to FIGS. l, 4, and 5, forming the top-of the pedestal and shown at 55 is what is referred to as a cap, comprising beams 54, 58 extending across the pedestal and attached to the top ends of upright beams 26, 28, 29, 30, 31, 32. In the embodiment illustrated, these beams generally define a square at the top of the pedestal. Also part of the cap are beams 56 which extend across the corners of the square dened by beams 54 and function to brace the cap. Structure 59 joined to beams 54,

58 and pipe 59 holds pipe 5i) securely in a centered posi- Y tion adjacent the top of the pedestal.

Joined to the top of cap 55 are a pair of semi-circular elements 60, 62, mounted in a horizontal plane and relatively positioned so that together they outline a circle on the top of the cap. Referring now also to FIGS. 6 and 7, gear teeth 64 are formed along the outside of these elements, and thus outer peripheral surface portions of these elements form what is referred to as a circle gear in the apparatus. This circle gear is utilized in swinging boom 12 from side to side about a vertical axis, as will be more fully described. The top surfaces of these semicircular elements are substantially fiat, and together form what is termed a circular rail or race at the top of the pedestal. This rail or race is employed in supporting the boom. The rail defines a swing axis for the boom (enabling the boom to be swung from side to side) which is substantially vertical, and extends through the axial center of the circular rail.

vBoorn 12 is mounted on the top of pedestal 4t) through a carbody 70 mounted on the circular rail formedby elements 60, 62. A plan View of portions of the carbody is illustrated in FIG. 5, and as shown it comprises elongated beams 72, 74 substantially parallel to each other interconnected by bracing beams such as beams 76. Trucks or sup- ports 78, 79, 86, mounted under the carbody serve to support the carbody on the top of semi-circular elements 60 while accommodating swinging of the carbody.

End 70a of the carbody which has the boom 12 of the crane mounted thereon (see FIG; 6) is supported by a pair of trucks '78, 79 spaced apart from each other along the periphery of the circle gear (as seen in FIG. 5) a distance at least equal to the width of gap 82 which is provided between beams 54 at one end of the cap, this gap also existing between the ends of elements 60, 62. This spacing enables load lines depending from the boom to be moved between the trucks and inwardly on the cap to within the confines of the pedestal. Each of these trucks may have the structure shown for truck 79 in FIG. 6, and includes wheels 84 journaled on the truck which ride on the tops of elements 60, 62. Shown supporting end 7Gb of the carbody (which is the end opposite end 70a) is truck 80, which has substantially the cornbined length of trucks 78, 79. This truck has wheels 8-8 journaled thereon which also ride on the tops of elements 60, 62.

Also mounting the carbody on the pedestal is a center pin fastened to structure 59 of the cap (and also supported by pipe 56). This center pin is received within a suitable bearing mounted on the underside of the carbody. The center pin, together with the trucks described,

function to mount the carbody on top of the pedestal with the carbody revolvable about a vertical axis extending through the axial center of the circle gear, which corresponds with the location of the center pin.

The carbody in FIG. 5 is shown with most `of the structure that it -supports in the crane removed therefrom. In the completed crane platform 92 provides space utilized to mount the hoist drums. A swing assembly, for producing swinging of the boom about the verticalaxis described, may be mounted in the space indicated at 94. Boom drums for raising and lowering the boom may be mounted in the space generally indicated at 96.

Boom 12 already mentioned may have, as shown in FIG. 1, an arch-type design for structural strength and stability. The boom is pivoted at one end (its, inner end) on the carbody through a boom shaft 100, this shaft being supported in bearing hangers 182. The boom has extending along the length thereof a pair of parallel track rails 194. These rails have an inner set of ends 10451 which, looking at a plan view of the crane, are located within the confines of the pedestal. The track rails have an outer set of ends 104b which are located directly adjacent the outer end or'tip of the boom.

Providing support for the boom on the carbody is what is referred to herein as a topping frame, shown at 110. This is an A-frame type structure, with legs 112 straddling the boom that are pivoted at 114, on the ends of beams 72, 74 of the carbody. Sheaves 116, 118 journaled on the topping frame, adjacent its top, train ropes or lines used in supporting the boom, and in swinging the boom to raise or lower its tip, as will be further described.

vLoads to be lifted andV moved by Kthe crane are supported from a trolley 120, containing the usual wheels 121 (see FIG. 2) that ride on track rails 104. The trolley is movable along the entire length of the boom, between setsof ends 104a, 104b.

A counterweight is shown at 122, which is attached to the carbody, adjacent the end of the carbody opposite the end which has boom 12 mounted thereon. Also shown in FIG. 1 is an operators cab 124, which is secured to the beams of the carbody through rails 126 extending back from the `top of the cab.

It should be noted that the boom when raised or lowered swings about a pivot axis (the axis of shaft which is located inwardly on -the pedestal from pivot means 114 which connects the base of the topping frame to the carbody. This relationship of pivot axes is irnportant, in obtaining stability and proper operation of the crane. In lifting heavy leads, the topof the boom may be elevated with the boom at a steep angle, as shown in FIG. 6, which has the effect of shifting the center of gravity of the boom together with its load inwardly on the pedestal. For maximum stability the pressure point of the boom on the pedestal should be as far inwardly on the pedestal as possible, and thus the importance of the location of the boom pivot axis, which is within the area encompassed by the circle gear. With respect to the topping frame, this performs its most important support function when the boom is set in a substantially horizontal position, as shown in FIG. 1. In order that the frame render maximum support for the tip of the boom, the base of the topping frame should be positioned as far out as possible toward the tip of the boom. Thus, pivot means 114 is located outside of the area bounded by the circle gear.

Considering now the mechanisms provided for moving the various parts in the crane, and referring to FIG. 1, the boom described has its tip raised from the position shown by operating a power-driven winch drum shown at 130 rotated under power by means of a motor (not shown). A boom line 132 wrapped on drum 130 extends rearwardly from the drum in a horizontal reach, whence it passes around a pair of sheaves 134, 136 journaled on support structure 137 provided at the end of the carbody. Line 132 thence extends upwardly in a reach 132e, around sheave 116 iournaled on the topping frame, thence back in a reach 1326, and around another sheave like sheave 136, but obscured by sheave 136 in FIG. 1. The line may extend back and forth in reaches similar to reaches 132a, 132b, whereby multiple part line, for example eight, extends between support structure 137 and topping frame 110. The end of the line may be anchored to support structure 137. In most instances such a line and drum may be provided on each side of the carbody between the carbody and topping frame.

Shown interconnecting the topping frame and the forward end or tip of the boom is a line 140 forming pendants for the boom. This line is connected to the topping frame through a tail hold 142, and extends forwardly and downwardly from the tail hold in a reach 140a to a sheave 144 journaled on the boom adjacent the forward end of the boom. Thence the line returns in a reach 140b to the topping frame, whence it extends about sheave 118 journaled on the topping frame. With a four part line for line 140, the line returns to the tip of the boom and extends around another sheave similar to the sheave 144, and thence extends back to the topping frame and another sheave similar to sheave 118. Thence the line extends downwardly in a reach 140C to a winch drum 148 mounted on the boom approximately midway between its ends. To change Ithe position of the boom relative to the topping frame, this line is taken in or payed out from winch drum 148. Again, in most instances, such a boom line may be provided for each side -of the boom. Ordinarily the amount of line payed out from drum 148 is unchanged after the boom is set up.

Considering the means provided to move trolley 120 to and fro on the track rails in the boom, at 150 is a line which is shown coming off the top of a power-driven drum 152. This line extends forwardly in an approximately horizontal reach, travels over guides 154, 156 at the top vof the boom, and thence about a sheave 158 at the forward tip of the boom. The line thence extends at 150a rearwardly on the boom to a sheave 160 mounted on the trolley, about this sheave, and in a return reach 150b to a becket 159 at the extreme tip of the boom. Another line 164 wound on power-driven winch drum 166 comes from the base ofthe drum and extends in a reach to a sheave 167 journaled on the boom intermediate the ends of the boom. After traveling over sheave 167, the line returns to a sheave 16S at the rear end of the boom, and thence extends in a reach to a sheave on trolley 120 (not shown), whence the line returns to a becket at the rear end of the boom (also not shown). With drum 152 rotated to wrap line 150 on the drum, line is let out from drum 166 and the trolley moves forwardly to the tip 0f the boom. With letting out of line from drum 152 and taking in line in drum 166, the trolley moves rearwardly on the boom.

Loads may be lifted by utiliz-ing the hook 178 shown which depends from load-lifting saddle block 180. This block is shifted up and down by a line 184 wrapped at one end around a winch drum 186 and wrapped at its other end around a drum 190. Line 184 extends outwardly from the top of drum 186 to fair lead 192, and thence over guides at Ithe top of the boom, at the locations of guides 154, 156, to 1a sheave similar to sheave 158 provided at the tip of the boom. The line then extends rearwardly on the boom and over a sheave 194 journaled on trolley adjacent the rear end of the trolley. The line then extends downwardly in a reach 184a, in a reach 184b over pulleys in a saddle block, and thence upwardly in a reaich 184C and over a sheave 187. From thence the line extends rearwardly along the boom around a sheave 188 journaled on the boom for rotation about an axis corresponding to the pivot axis about which the boom swings up and down. The line thence travels over fair lead 193, whence it becomes wrapped around drum 190. To move the saddle block upwardly at a slow speed drum 186 is rotated at a slow speed, either to take in or to pay out the line, and for high speed movement the drum 190 is operated. Part of the drive means for the two drums is shown at 194.

The boom is swung about its vertical swing axis, and referring now to FIGS. 6 and 7, yby a pair of spaced drive vpinions 194, 196 with teeth meshing with the teeth of the circle gear. These are mounted `on shafts 198, and these shafts have gears 200 secured to the top ends thereof. Mes'hing with these gears is a gear 202 connected to a shaft 204 which is joined to a bevel gear 206. Bevel gear 206 is driven bya gear 208 and motor 210. The two drive pinions are spaced far enough apart from each other about the periphery of the circle gear, whereby on the carbody I.moving so as to place the drive pinions lin the vicinity of gap 82, 'and on movement of the carbody, there is always engagement of at least one of the pinion gears with the teeth of the circle gear. Gear movement is synchronized through the drive system disclosed, so that upon a gear moving :free of and thence returning to the teeth of the circle gear, proper mesh is assured.

Referring to FIG. 2, when handling heavy loads, the tip of fthe boom may be 'swung upwardly to place the boom at a steep angle, which lmay be in a range of 85 -or so lfrom horizontal. This Aangle for the boom is also illustrated in FIG. 6. With such positioning of the boom, and to increase the capa-city of the boom, line 184 employed to move the saddle :block up and down, may be changed from the two part line already described and in FIG. 1, to a four part line as shown in FIG. 2. This is readily done by taking portion 18417 of the line located between the two pulleys of the saddle block, preparing a bend in this portion of the line, and placing this bend about an idler sheave 212 journaled on the trolley. This results in ,four reaches of the line extending down from the trolley to the saddle block as shown in FIG. 2. With heavy loads trolley movement is not utilized, and the trolley is locked in place on the tip of the boom. This may be done by inserting removable anchor pins, such as those shownat 214 (one on each side of the trolley) through slots such as slot 216 in the frame structure of the trol-ley, and seating o'f the pins within accommodating bores provided in the frame of the boom.

It should be apparent from the above that a versatile crane is contemplated, which can handle all types of loads. In handling some loads, movement laterally of the pedestal may be produced by moving the trolley along the track rails on the boom. Loads within the contines of the pedestal can be picked up yand moved outside the pedestal, with the load lines passing through gap 52 in the pedestal and gap 82 in the circle gear. The increased width of gap 52 illustrated at the base of the pedestal allows for lthe passage of a load as Well as the passage of the load lines. Thus, fast pick up and depositing of loads is possible, with minimum movement ofthe edestal. Further, space requirements 4are reduced. Loads can 'also be handled by moving the pedestal along the tracks, and swinging the boom about -a vertical axis to place the tip thereof over the area bounded by the tracks.

The crane has many features of the Whirly crane in that the boom may be swung up and down to lift loads or shift their position. With very heavy loads the boom may be set at a steep angle, and ia four part line utilized for the saddle block.

The broom is particularly well suited for jobs such as the building of dams, etc. This is for the reason that the boom can be set at an angle, and the trolley moved along the boom to deposit loads at some distance from the pedestal kat a high elevation. This reduces the number of Itrestle structures needed for building of the darn.

While an embodiment Iof the invention has been described, tch-anlges and variations are possible without departing from the invention. It is desired to cover all such variations las would be apparent to lone skilled in the art, and that come with-in the scope of the appended claims.

It is claimed and desired to secure by Letters Patent:

1. In a crane,

an upright pedestal,

a circular r-ace disposed in a substantially horizontal plane mounted on the pedestal adjacent the top thereof with the center of the race located inwardly of the sides of said pedestal,

a carbody, and means mounting the carbody on said race With the carbody revolvable about an upright axis extending through the center of said race,

track means supported by said carbody and above said race extending, on viewing the crane in plan, from a region bounded by the race lto a region located laterally of the race and a side of the pedestal,

means in said pedestal defining a gap extending upwardly along a side of the pedestal,

means forming a gap in said race which is above and a continuation of said tiret-mentioned gap in said pedestal, and

a trolley on said track means movable therealong,

said gaps enabling load lines depending from said trolley -to be shifted from inside to outside the confines of said pedestal on movement orf the trolley along said track means.

2. In a crane,

an upright pedestal,

a circle gear mounted on the pedestal adjacent the top thereof, having gear teeth disposed in a circular course extending about the gear, with such course in a substantially horizontal plane,

a carbody mounted adjacent the top of the pedestal rotatable about an upright axis that extends through the center of said circle gear,

means forming a gap in said circle gear, extending inwardly from one side of the gear, operable to receive load lines depending from the carbody, and

at least a pair of spaced power-driven drive gears mounted on said carbody engaging said circle gear at points spaced along said course,

said spacing between the drive gears being suiiicient to enable engagement of at least one drive gear at all times with the teeth of said circle gear on the carbody rotating so as to move the drive gears across the gap in said circle gear.

3. In a crane,

an upright pedestal,

a circular race disposed in substantially a horizontal plane mounted on the pedestal adjacent the top of the I pedestal,

a carbody, and a boom mounted on said carbody extending to one side of the carbody,

means mounting the carbody on said race whereby the carbody is revolvable about an upright axis extending through the center of said race, l means forming a gap in said race extending inwardly from the perimeter of the race, operable to receive load lines extending downwardly from the carbody,

said means mounting the carbody including multiple supports travelable in a path defined by said race,

said multiple supports including a pair adapted to span the gap in said race.

4. The crane of claim 3, which further includes a circle gear having teeth disposed in a circular course concentric with said race, there being a gap `in said circle gear in a region aligned with the gap in said race, and which further includes a pair of power-driven drive gears mounted on said carbody engaging the teeth of said circle gear, said drive gears being spaced apart and said spacing between the drive gear being sulicient to enable engagement at all times of at least one drive gear with the teeth of the circle gear on the carbody rotating so as to move the drive gears across the gap in said circle gear.

5. In a crane,

Y an upright pedestal,

a circular race disposed in substantially a horizontal plane mounted on the pedestal adjacent the top thereof,

said race having a center located inwardly from the sides of the pedestal,

support structure in the pedestal located adjacent the center of said race,

a carbody, and means mounting said carbody on said race with the carbody revolvable about a vertical axis coinciding with the center of the race,

means mounting said carbody on said support structure in a region adjacent the center of the race, providing additional support for the carbody on said pedestal, and

a boom mounted on said carbody extending out to one side of the carbody,

said pedestal and race having a gap defined along one side of the crane which accommodates load lines depending from said boom.

6. The crane of claim 5, wherein said boom is provided With track means extending along the length thereof, and which further comprises a trolley mounted on said track means for movement along the length of the boom, and wherein load lines depend from said trolley, and said gaps accommodate movement of the trolley along said track means to a region which, viewing the crane in plan, is located inwardly of the sides of the pedestal and a side of said race.

7. In a crane having an upright pedestal and a carbody mounted on the top of said pedestal revolvable about an upright axis,

an elongated boom, and pivot means pivotably mounting one end of said boom on said carbody enabling its opposite end to be swung up and down,

an upright topping frame and pivot means pivotally mounting the base of said topping frame on said carbody,

said pivot means forv said topping frame being spaced toward said opposite end of the boom from the pivot means for said boom, whereby the boom pivots about a pointlocated toward its said one end from where the topping frame pivots,

line means extending from the'top of said topping frame, and one side thereof, to said opposite end of the boom, for supporting said opposite end vof the boom from the topping frame, and

boom line means extending from the top of said topping frame, and from the opposite side thereof, to said carbody, adapted to be taken in and out, and

operable when such is done to shift the topping frame and raise and lower said opposite end of the boom. 8. The crane of claim 7, which further comprises track means extending along said boom terminating at said one and said opposite ends of the boom, a trolley mounted on said track means for movement therealong along the length of said boom, a load line including a portion depending from said trolley means for picking up a load, winch means for paying in and out said load line, mounted on said carbody at a point disposed beyond the booms said one end, having said load line wrapped thereon with a portion forming a reach extending from said winch means to said trolley, and

a sheave for training said reach of the load line where the same extends between the trolley and said winch means, journaled for rotation about an axis coinciding with the pivot axis of the boom. 9. The crane of claim 8, wherein means is provided for securing together said trolley and boom, with the trolley located adjacent said opposite end of the boom, thus to make the trolley stationary when the crane is used to lift heavy loads and the boom is set in a position extending upwardly at an angle from its said pivot means.

References Cited bythe Examiner Y UNITED STATES PATENTS 1,117,917 11/1914 Schoenky 212-63 X 2,143,111 1/1939 Hayes 212-59 X 2,370,661 3/1945 Hayes 212-59 2,374,074 4/1945 Berby et al 212-59 `3,153,486 10/1964 Str-and 212-64 X FOREIGN PATENTS 1,132,309 6/ 1962 Germany.

583,895 3/1944 Great Britain.

EVON C. BLUNK, Primary Examiner.

SAMUEL F. COLEMAN, Examiner.

20 A. L. LEVINE, Assstant Examiner.

Claims (1)

1. IN A CRANE, AN UPRIGHT PEDESTAL, A CIRCULAR RACE DISPOSED IN A SUBSTANTIALLY HORIZONTAL PLANE MOUNTED ON THE PEDESTAL ADJACENT THE TOP THEREOF WITH THE CENTER OF THE RACE LOCATED INWARDLY OF THE SIDES OF SAID PEDESTAL, A CARBODY, AND MEANS MOUNTING THE CARBODY ON SAID RACE WITH THE CARBODY REVOLVABLE ABOUT AN UPRIGHT AXIS EXTENDING THROUGH THE CENTER OF SAID RACE, TRACK MEANS SUPPORTED BY SAID CARBODY AND ABOVE SAID RACE EXTENDING, ON VIEWING THE CRANE IN PLAN, FROM A REGION BOUNDED BY THE RACE TO A REGION LOCATED LATERALLY ON THE RACE AND A SIDE OF THE PEDESTAL, MEANS IN SAID PEDESTAL DEFINING A GAP EXTENDING UPWARDLY ALONG A SIDE OF THE PEDESTAL, MEANS FORMING A GAP IN SAID RACE WHICH IS ABOVE AND A CONTINUATION OF SAID FIRST-MENTIONED GAP IN SAID PEDESTAL, AND A TROLLEY ON SAID TRACK MEANS MOVABLE THEREALONG, SAID GAPS ENABLING LOAD LINES DEPENDING FROM SAID TROLLEY TO BE SHIFTED FROM INSIDE TO OUTSIDE THE CONFINES OF SAID PEDESTAL ON MOVEMENT OF THE TROLLEY ALONG SAID TRACK MEANS.

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