Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS2446220 A
Publication typeGrant
Publication dateAug 3, 1948
Filing dateSep 11, 1944
Priority dateSep 11, 1944
Publication numberUS 2446220 A, US 2446220A, US-A-2446220, US2446220 A, US2446220A
InventorsNicholas M Erdahl
Original AssigneeTrackson Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Combined crane and material-moving device
US 2446220 A
Abstract  available in
Images(3)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Aug. 3, 1948. ERDAHL 2,446,220

COMBINED CRANE AND MATERIAL-MOVING DEVICE Filed Sept. 11, 1944 3 Sheets-Sheet 1 mmvmx. MCI/04198 Elem/YA H rromsa N. M. ERDAHL COMBINED CRANE AND MKTERIAL-MOVING DEVICE Filed Sept. 11,1944

Aug. 3, 1 948 3 Sheets-Sheet 2 IN VEN TOR.

Aug. 3, 1948. N. M. ERDAHL COMBINED CRANE AND MATERIAL-MOVING DEVICE Filed Sept. 11, 1944 3 Sheets- Sheet 3 error/wry.

enema Aug. a, 1948 COMBINED CRANE AND MATERIAL-MOVING DEVICE Nicholas M. Erdahl, Milwaukee, Wis., assig nor to Trackson Company, Milwaukee, Wis., a corporation of Wisconsin Application September 11, 1944, Serial No. 553,554

8 Claims. (01. 37-144) This invention relates to improvements in a combination crane of the mobile type and a. material-moving blade or scoop, and particularly to a structure employing common means to operate either the crane or the blade or scoop.

Cranes of the mobile type are known in which an automotive vehicle, such as a tractor of the track-laying type, furnishes both the mobility for and the power for operating the crane. In such structure, a frame straddles the tractor and is fixed thereon at a suitable location, such as the tractor track frame. fixed mast on which is mounted a revolvable mast driven by means preferably transmitting torque only between the revolvable mast and its drive. The revolvable mast carries a plurality of sheaves and a boom which are respectively rotatably and pivotally mounted thereon, the boom having sheaves mounted on the outer or tip end thereof. A cable is fixed at one end to the tip end of the boom and is reeved over some of the sheaves to a winch for raising and lowering the boom, and another cable extends from another winch over others of the sheaves to a hook for attachment to any desired load to be raisedand lowered. Power is taken by suitable means from the prime mover or the tractor, or other vehicle on which the above structure is mounted, and is'applied under the control of suitable clutches and transmission gearing to the drive for the revolvable mast and to both the winch for the boom cable and the winch for the load cable. The mast drive and the winch drives are designed to secure control of movement thereof in both directions and are also preferably provided with automatically acting means to prevent undesired reversal of movement of any of the driven parts. Further information regarding a rotating crane of the mobile type may be obtained from U. S. Letters Patent No. 2,381,731 issued to me on July 31, 1945 and entitled Revolving cranes.

One object of the present invention is to so combine a crane of the character above indicated with a material-moving blade or scoop as to employ the operating means for the crane, for

controlling the action of the blade or scoop.

Another object of the invention is to provide a material-moving blade or scoop for use with a mobile revolving type crane in which the revolvable mast and the crane boom are locked against movement during use of the blade or scoop.

Another object of the invention is to provide detachable sheaves for mounting ona combined mobile crane and material-movingdevlce to pro- The frame supports a vide for ready reeving of the crane load line when use is to be made thereof in controlling the material-moving device.

, 'set forth will be apparent from the following description when read in connection with the accompanying drawing, in which:

Fig. 1 is a perspective view of a mobile revolving, type crane combined with a material-moving blade or scoop and showing the crane load line cable rigged for controlling the scoop;

Fig. 2 diagrammatically illustrates the rigging of both of the crane cables when the load cable is rigged for controlling the blade or scoop;

Fig. 3 is a side view of a detachable bracket for mounting on the boom and carrying sheaves for the load cable when it is rigged to control the scoop, as shown in Fig. 2;

Fig. 4 is a front view of the sheave bracket shown in Fig. 3;

Fig. 5 is a top view of a detachable bracket for mounting on the boom to provide an anchor for the load hook of the crane when the materialmoving blade or scoop is used;

Fig. 6 is a side view of the hook anchor shown Fig. 10 is a front view of a sheave and the means for mounting the same on the back or nonworking surface of the {blade or scoop;

Fig. 11 is a side view of the sheave and mounting shown in Fig. 10;

Fig. 12 is a fragmentary view partially in elevation and partially in section, of a modified sheave utilizing portions or the structures 0! Figs. 4 and 10;

3 Fig. 13 is a sectional view taken on of line XIII-XIII of P18. 12; Fig. 14 is a partial perspective view showing the normal crane boom replaced by a dummy the plane boom when the machine is to be used as a material moving device only; and

Fig. 15 diagrammatically illustrates the rigging particularly of the load cable, when the dummy boom is employed.

The tractor on which the' combined revolving -crane and material-moving blade or scoop are of U shape and are mounted in inverted position over .and straddling the tractor. The frame members l6, I! are joined at the top by members I! forming a platform on which is mounted a fixed mast portion enclosed by a revolvable mast bearing rotatably supported sheaves 2!, a sheave 22, and a boom, generally designated 23 and pivotally mounted on the mast as at 24. The boom is provided at its free or tip end with sheaves 25 and 26, respectively, carrying the boom-operating cable 21 and the load-lifting cable 28, with a weight 29 and a hook 30 attached to one end thereof. The end of the boom cable 21 is fixed on the tip end of the boom and is reeved over sheaves 22, 25, one of sheaves 2!, a sheave 32 adjacent the base of the mast, and on the drum 33 of a winch for raising and lowering the boom.

A boom-supporting frame includes pairs of members 36, 37, which are secured to upper and lower portions, respectively, of the mast-supporting frame members 'li on each side of the tractor to extend forwardly and above the tractor structure. The pairs of side members 36, 31 on the two sides of the tractor are joined by a cross member 38 in a horizontal plane somewhat below that of the axis of the boom pivot so that the boom may rest on the cross member in substantially horizontal position. The boom-supporting cross member 38 is formed with spaced arcuate guides 39 (see Fig. 8) forming a seat for I the boom substantially on the longitudinal axis of the tractor, and the boom is retained in the seat on the cross member by clamping fingers ill. The clamping fingers are pivoted on the cross member tosswing into and out of engagement with the boom and are connected by adjustable rods 42 with an over-center toggle plate 43 pivoted on the cross member 38. the toggle plate being provided with a handle 44 by which the fingers may be swung into and out of engagement with the boom. The toggle plate 43 is provided with a detent (see Fig. 9) comprising a plunger 45 extending through the plate and urged toward the boom frame cross member 38 by a spring 46. The nose of plunger 45 is adapted to engage in hole 41 or hole 48 in frame member 38 when the clamp is in engaging and disengaging position, respectively. The detent is disengaged from the holes merely by pulling on the head which is held while the toggle plate is swung on its pivot. Release of the plunger 45, when the clamp fingers are in either of their end positions, causes the nose thereof to engage one of the holes 41 or 48. It will be seen that the construction of the clamp above described forms a look by which the clampis to be used with the blade or scoop, a sheave main on the boog;

position, preventing accidental engagement of the boom and preventing movement of the boom when engaged by the fingers, respectively.

' When the boom is locked in its seat on the boom-supporting frame, the load line 28 may be used to control a material-moving blade or scoop, according to the present invention. In the present instance, a scoop is shown ascomprising a blade '49 with a cutting lip 50, side pieces 5|, and a top piece 52, although it will be understood that only the blade may be used, or that a scoopof other construction may likewise be used. The scoop is mounted on arms 53 which are so spaced that the arms -extend along the sides of the tractor for pivotal mounting, as at 54, on a portion of the track frame, or at another suitable location,-

as on the mast frame, dependent on whether the scoop is to be used merely as a bulldozer or as a loader also.

The crane boom is made (see Fig. 4) with side members 55 shown as being channel shaped, the boom side members being spaced and stiffened by cross members such as angles 51 and plates 51' (see Figs. 5 and 6).. When the crane bracket (see Figs. 3 and 4) is clamped on the boom, preferably as closely adjacent to the boom support frame 36, 31, 38, as is practical. It will be understood that the sheave bracket may replied to either a ed or telescoping boom. The sheave bracket generally comprises side plates 58 joined by a cross member 59 shown as angle shaped and carrying sheaves 60, 56. The bracket is of such size as to fit closely about theboom and the side plates 58 are provided with blocks 64 on facing sides thereof and so spaced that the bracket cross angle 59 is brought closely ad- Jacent to the bottom surfaces of the boom members 55 when the blocks 64 rest on the upper surface of the boom members 55. Bolts 65 extend through the bracket side plates 58 and are severally provided with hooked sleeves 66 to engage over the edge of the boom members 55 when drawn up by the nut 6'! on each bolt. Shifting of the sheave bracket toward the end of the boom is prevented by one of the boom cross members 57 which engages with a block 68 on the bracket cross angle 59, and by a block 69 extending laterally from the block 68 and clamped to the lower flange of the boom member 56 as by bolts 10 and nuts H. A carrier for the sheaves 60, Si is .formed by plates 14 and 15 attached to the bracket cross angle and carrying an axle ll formed with a square section 18 at one end thereof to engage with a stop block 19 fixed on the carrier plate I4, whereby the axle is prevented from turning. A' cable guide is placed between the sheaves 60 and iii and is formed by spaced plates mounted on the axle and pivoting thereabout until the plate ends 8i engage with the edge of the bracket cross member 59. The guide plates 80 are connected by cross plates 82, with one of such cross plates 82 carrying a bolt and nut 83 and a clamping plate 84 which may be moved into and out of engagement with an edge of the bracket cross member 59.

The hook weight 29 and the hook 30 are attacha-ble to an anchor, see Figs. 5 and 6, formed generally of an angle 85 extending across the width of the boom and of such length that side plates 86 secured to the ends thereof lie closely adjacent the side surfaces of the boom, the plates being joined by a tie bolt 81 extending over the at all times and may be aD- boom. A bottom plate ll isjlxed to one leg of the cross angle II and to theside plates 00. Hook blocks extend from the other leg of the angle II to hook over boomcross member 01' and fix the position oi the anchor when tension is put on the line 28, A bar 00 is mounted on the bracket cross angle to extend across the space between the one leg of the cross angle and bottom plate 00 for engagement by the hook 00. A cradle for carrying the weight 29 is formed from side bars 0| joined by an arcuate strip 02 and is removably mounted on' the anchor bracket by extension of the side bars over a plate 03 through which screws 04 extendto secure the cradle side barsin position. The plates 02 are joined to bars II as by welding to provide ollset extensions of such bars for attachment by the screws 04 to the plate 00. When the hook is to be anchored the screws 00 are backed off to release the cradle bars 8i which permits removal of the cradle.

The hook is then engaged with th bar 00 and the cradle 0i, 92 ls brought up to receive andload line arranged, as shown in Fig. 2, in

which the end of the line having the hook 00 attached thereto is anchored to the boom. The.

s' ide structure rotates clockwise about the sheave axle III to provide a space above the sheaves through which a bight of the cable 20 may be pushed. the bight being intended to pass around the sheave I02. The running part of the cable is then carried by sheave 80 while the standing part 01' the cable merely rests on the sheave 0i due to anchoring of the end of the cable adjacent the sheave. And to reeve the cable 23 over the sheave I02, the detent plunger I0! is de- I pressed against the force of the spring I00 to reblade or scoop to receive a pivoted mounting for a readily demountabie sheave, such sheave being known as of the snatch-block type. Plates 00 carry a pivot pin 91 on which is placed the sheave mounting including pivot bearing portions 00 and spaced side plates 88, the one pivot portion 00 preferably being provided with a lug I00 to limit the degree to which the sheave may be swung away .irorn the bulldozer blade. The mounting side plates 00 are provided with a pin III forming anaxle for a sheave I02 and extending therethrough, the one end of the pin hav ing a squared portion engaging a block I03 to prevent turning of the axle. The squared end of the axle MI is also provided with a handle ill by which the axle may be manipulated, as will be described. The other end of the axle IN is tapered for ready insertion through the holes in the mounting side plates 99 and the sheave I02 and is formed with a groove adjacent thetaper. The groove provides a seat for a detent, shown as comprising blocks I08 flxedjon a mounting side plate 00 and supporting a round-nosed plunger I01 urgedinto the groove by a spring I00. The

spring acts between a shoulder of the plunger and one of the blocks I06 and cooperates with moving material and must be movable in order to permit swinging of the load cable as. the blade or scoop is raised and lowered. Ii the blade or scoop pulley, however, is omitted, the force multiplication obtained thereby is lost and increased power is necessary to control the same.

When thestructure above described is used, the

lease the nose of the detent from the groove in the axle. The axle may then be withdrawn 8. suiflcient distance to allow the sheave I02 to be removed for looping the cable 28 over the sheave which is then replaced in the mounting, the axle bracket sheaves 60, BI, and the end of the weight 29, an arcuate saddle maybe provided for such cable part and the sheave 60 may then be mounted as shown in Fig. 12, which mounting is similar to the mounting of sheave-I02. The bracket 50, 59, and the plate 14 are precisely the same as shown in Figs. 3 and 4. A cable guide plate I II is fixed on the bracket at a spacing from the plate H such that the sheave fits properly into the space. A second cable guide plate H8 is secured on the bracket and has mounted on one side thereof a saddle 0 which is preferably approximately semi-circular with a groove of the same cross sectional size and radius as the groove in the sheave 60, the position of the saddle being such as tofurnish proper support for the bend'in the standing part of the cable extending from the hook 30 to the sheave I02. A tube H9 extends through plates H5 and H6 to form a spacer and stiffener for the plates and to act as a sleeve receiving an axle I20 for the sheave 60. One end of the axle is provided with a handle I2I and the other end of the axle is tapered and formed with a groove to receive a detent I22 which is similar to that described in Figs. 10 and 11 and therefore not further described. Rotation of the axle I20, which would release the axle from its detent, is prevented by engagement of a stud I25 extending through thesleeve H9 into a keyway I26.cut into the axle, the key-way havin a portion at right angles to the portion of the keyway shown in Fig. 12. When the modification described immediately above is used, the standing part of the cable is laid on the saddle H8 and the cable is looped over the sheave I02 as above described. The axle I20 is then pulled toward the right (of Fig. 12) to release it from the detent I22 whereupon the sheave 00 is removable for laying the running part of the cable 20 thereon. The

sheave is then replaced in its carrier and the axle 7 is reinserted which places the cable in the position shown in Fig. 2 for use of the blade or scoop.

When a fixed boom is used on the crane, the hook anchor previously described may be replaced by the structure shown in Fig. 7 in which a rod I is pivotally connected with the tip end of the boom and is provided with an eye I29 at itsother end to receive the hook 30. An angle I00, braced as at I3I, ismounted on the rod I20 to extend into contact with the boom and retain the rod in the axial line of the hook and cable. A cradle is then secured to the eye I29 oi the rod to receive and retain the hook weight 20 and the hook 30 in a straight line with the cable 28 when tension is applied thereto. The cradle comprises side bars I33 (of which only one appears in the drawing) secured to the eyelet end of the rod I28 and joined by arcuate cross straps I and I 35 of such size as to receive the weight 20. The rod I28 is pivotally connected with the tip end of the boom so that tension on the hook will. pull the rod into and hold the rod in the proper position with the brace I30, I3I in contact with the under side of the boom.

When the crane is to be used as a bulldozer or pusher for anextended period of time, or in close quarters, the boom 23 may. be replaced by a boom-like member or dummy boom I; (see Fig. .14) mounted on the boom pivot 24 in the mast 20. The dummy boom preferably extends only a short distance beyond the end of the tractor itself and need be provided only with a single sheave, indicated at III, at the tip end thereof. The load cable 20, from which the weight and the hook must be removed for threading the cable over the sheave I, is then looped through an eye-bolt I42 in the end of the boomlike member and is clamped to provide anchorage for the end of the cable. The cable 28 is then reeved, as shown in Fig. Y15, and the boom cable 21 is drawn back to the mast where the end thereof is attached to the mast adjacent the sheave 2|. The load line 20, minus the weight 20' and the hook 30, is readily reeved over the sheave I by threading through the mounting thereof and may be reeved over the sheave I02 as already described.

In the modification described immediately above, the sheave I might be mounted directly on the frame 36, 31, 38rather than on the boom-like member I40. And the end of the crane load cable might be connected directly to the material-moving blade or scoop rather than brought back to the'dummy boom I40. If such construction, however, is made, the force multiplication of the blade sheave is lost and a pivoted connection must be provided for the end of the crane cable.

It is desirable to provide means for locking the revolvable mast 20 against movement by latching its power cont ol leverage I45 (see Fig. 1) against independent actuation thereof.- Such lock is obtained by pivoting a latch I46 on a stationary portion of the mast structure adiacent the power control leverage. One end of the latch I4,0-is provided with a notch which engages'over the power control leverage I45 and the pivot for the latch is so placed that the latch remains in engaged position due to its weight unless voluntarily disengaged. There is no need for providing a lock for the boom winch due to the fact that the control lever for such winch is located, as shown in my above identified patent, ina position in which accidental -actuation of such lever is impossible.

Although but one embodiment oi the present invention has been illustrated and described, it will be apparent to those skilled in theart that various changes and modifications may be made therein without departing from the spirit of the invention or from the scope of the appended claims.

I claim:

s 1. In combination with a crane mounted on an automotive vehicle, the crane including a boom, a cable for raising and lowering a load, and means for raising and lowering the cable; a materialmoving scoop pivotally mounted on the vehicle, sheaves rotatable on a common axle mounted on the boom, a cable guide mounted between the sheaves and on the axle therefor, the guide be ing movable to pass a bight of the cable, a sheave mounted on the scoop to receive the bight oi the cable, and means anchoring one end ofthe cable to the boom.

2. The combination with a crane mounted on an automotive vehicle, the crane comprising a boom, a load cable carried by the boom, a weight and a hook at one end of the cable, and means for winding and unwinding the cable to raise and lower the hook; or a material-moving scoop pivotally mounted on the vehicle, sheaves mounted on the boom to carry a standing part and a running part of the cable, a sheave mounted on the scoop to receive a bight of the cable, and a cradle mounted on the boom for'carrying the weight type mounted on an automotive Vehicle, the

crane having a pivoted boom, means for raising and lowering the boom, and a cable on the boom for raisin and lowering a load; with a scoop pivoted on the vehicle, means connecting the cable and the scoop for pivotal movement there'- of, 'a frame mounted on the vehicle and providing 'a seat for the boom, and means'mounted on the frame for clamping the boom thereon.

5. The combination of a crane of the revolving type mounted on an automotive vehicle, the crane having a pivoted boom, means for raising and lowering the boom, and a cable on the boom for raising and lowering a load; with a scoop pivoted on the vehicle, means connecting the cable and the scoop for pivotal movement of the latter, a frame mounted on the vehicle and providing a seat for the boom, fingers pivoted on the frame for swinging into and out of engagement with.

and clamping the boom on the frame, and means for swinging and releasably holding the fingers in boom-engaging and disengaging position.

6. The combination of a crane mounted on an automotive vehicle, the crane being of the type including a revolving mast, power-driven means for revolving the mast, a leverage controlling the supply of power tothe mast, and a cable for raising and lowering a load; with a materialmoving blade pivoted on the vehicle, means connecting the cable and the blade for pivotal movement thereof, and a latch mounted uponthe mast for holding the control leverage of the driving means therefor in inoperative position when the blade only is to be operated.

7. In combination with an automotive crane including a boom, a. cable for raising and lowering a load, and means for raising and lowering the cable, a material-moving blade pivoted on the crane, an axle fixed on the boom. sheaves rotatable on the axle, means mounted on the axle between the sheaves for guiding the cable and movable to pass a bight of the cable, a sheave of the snatch block type mounted on the blade for pivotal movement only, and means anchoring one end of the cable to the boom.

8. The combination with an automotive crane including a boom pivoted thereon, means for raising and lowering the boom, a cable mounted on the boom for raising and lowering a load, and means for raising and lowering the cable, with a material-moving blade pivoted on the crane, means connecting the cable and the blade for pivotal movement of the latter, a frame mounted 10 on the crane and providing a seat for the boom, fingers pivoted on the frame for swinging into and out of clampingengagement with the boom, and a detent holding the fingers either in engaged or in disengaged position on the boom.

NICHOLAS M. ERDAHL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Austin Sept. 17, 1940

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US301347 *May 19, 1884Jul 1, 1884 Pulley-block
US811191 *May 19, 1905Jan 30, 1906Frank Paul WhitesidePulley-block.
US901144 *Apr 7, 1908Oct 13, 1908John BassSheave-block.
US1477639 *Feb 13, 1923Dec 18, 1923Earl Fishback LloydTackle block
US1645014 *Jan 11, 1927Oct 11, 1927Mckissick William HSafety sheave block
US2081939 *Apr 10, 1936Jun 1, 1937Letourneau IncImplement hoisting frame for tractors
US2215025 *Jan 23, 1939Sep 17, 1940Plant Choate Mfg Co IncEarth mover
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2558686 *Sep 24, 1948Jun 26, 1951Washington Iron WorksPortable crane
US2564169 *Apr 6, 1948Aug 14, 1951Burton B ChisholmPortable loader
US2647331 *Aug 19, 1946Aug 4, 1953Koehring CoCombination crane and bulldozer
US2660816 *Feb 17, 1949Dec 1, 1953Willard A MaxwellCombination bulldozer and shovel arrangement
US2713218 *Jun 8, 1954Jul 19, 1955Dyer Charles EBulldozer and boom attachment therefor
US3372908 *Feb 27, 1967Mar 12, 1968Norco IncQuickly openable snatch block
US4215496 *Nov 13, 1978Aug 5, 1980Wehr Thomas LVehicle bumper
US4821436 *Nov 14, 1983Apr 18, 1989Slocum Alexander HBlow system
US5645180 *Oct 26, 1994Jul 8, 1997Knight Industries, Inc.Floor mounted rotatable jib crane
Classifications
U.S. Classification172/829, 212/292, 212/245, 37/407, 414/912, 254/405, 212/299
International ClassificationE02F3/96, B66C23/44, B66C23/36
Cooperative ClassificationB66C2700/0357, B66C23/44, Y10S414/125, E02F3/961, B66C23/36
European ClassificationB66C23/36, E02F3/96B, B66C23/44