US3113681A - Crane - Google Patents

Description

Dec. 10, 1963 Filed Nov. l2, 1959 E. E. CRILE 5 Sheets-Sheet 1 m VTI als *t I I Dec. 10, 1963 E. E. cRlLE 3,113,681

CRANE Filed Nov. 12, 1959 5 Sheets-Sheet 2 INV EN TOR. Eva/swf E 65e/E Dec. 10, 1963 E. E. cRlLE 3,113,681

CRANE Filed Nov. 12, 1959 s sheets-sheath INVENTOR. Z6-WE (7e/E A GENT Dec. 1o, 1963 E. E. CRILE 3,113,681

CRANE Filed Nov. 12, 1959 5 Sheets-Sheet 4 mmUnummuw Dec. 1o, 1963 E, E, CRILE y 3,113,681

CRANE Filed Nov. 12, 1959 5 Sh-eets-Sheet 5 nel!!! w I INVENTOR. {06E/VE E. (5e/5 MMMQM United States Patent O 3,113,68l CRM@ Eugene Criie, Mi? YW. Mariette Ave., Phoenix Ariz. Filed No i2, l959, Ser. No. 852,424

rl`his invention relates to a crane and more particularly to a crane for use on trucks for loading and unloading the same; said crane being adapted to handle cubes of concret-e blocks or other material and having its entire motivating and power mechanism on the boom structure thereof above the bed of a truck on which it is supporte Cranes of conventional prior art construction which are employed to load and unload ilat bed trucks generally include mechanism below the truck bed for actuating the crane and providing power for its operation. These cranes require a variety of mechanism which must be installed on the truck and operable in connection with the chassis thereof. Furthermore, such equipment is so located that it is ditiicult to service and maintain. Additionally, such equipment is ordinarily best suited to an installation on relatively heavy trucks.

The foregoing prior art structures are generally expensive from a standpoint of initial investment and further require installation facilities which are expensive.

Accordingly, it is an object of the present invention to provide a crane for loadinsy and unloading trucks which may be installed on the upper surface of a truck bed without requiring any actuating means below the upper surface of the truck bed.

Another object of the invention is to provide a crane for loading and unloading truck beds which is provided with a swingahle boorn carrying means for powering the hoisting mechanism of the crane as well as the boom winging mechanism ofthe crane.

Another object of the invention is to provide a crane having a boom swingaole on a substantially vertical axis and carrying an engine which operates hydraulic means to power hoistnig equipment on the boom and also to swing the boom around said vertical axis.

Another object of the invention is to provide a crane for loading and unloading flat bed trucks which is provided with a boom swingable about a vertical axis which carries an engine and power equipment on one of the boom supporting the hoisting mechanism whereby the engin-e and power equipment of the crane tends substantially to counter balance the end ofthe boom which supports the hoisting mechanism.

Another object of the invention is to provide a crane for ioading and unloading flat bed trucks which is Very simple and economical of construction and installation and maintenance.

Another object of the invention is to provide a crane wherein the boom thereof swings about a vertical axis and vhereon all of the power mechanism required to operate hoisting mechanism and to swing the boom is carried on the boom itself.

Another object of the invention is to provide a crane for loading and unloading trucks having a novel hydraulic power mechanism totally supported on the swinging boom of the crane for operating hoisting mechanism and for swinging the boom of the crane about a vertical axis.

Another object of the invention is to provide a crane for loading and unloading dat bed trucks; said crane having a base adapted to be mounted on the upper surface of a :dat bed truck and provided with extendable outriggers disposed to be extended horizontally and vertically in order to engage the ground and balance the truck when a heavy load is picked up laterally of the truck bed.

Another object of the invention is to provide a novel telescopic Outrigger mechanism disposed in the base of a crane which is totally disposed above the upper surface of a dat bed truck.

Further objects and advantages of the invention may be apparent from the following specication, appended claims, and accompanying drawings in which:

FIG. l is a side elevational View of a crane constructed in accordance with the present invention and showing it mounted on the upper surface of a truck bed.

FIG. 2 is an enlarged fragmentary sectional View taken from the line 2 2 of FlG. 1.

FIG. 3 is an elevational View of the mechanism shown in FlG. 2 taken from the line 3 3 of FIG. 2.

FG. 4 is a fragmentary perspective view of the outrigger mechanism of the present crane showing it extended laterally and to the ground for stabilizing a truck bed on which the crane is mounted.

FG. 5 is an enlarged fragmentary sectional view taken from the line 5 5 of FlG. 1.

FIG. 6 is an enlarged fragmentary top or plan View taken from the line 6 6 of FIG. l.

FiG. 7 is an enlarged transverse sectional View of the boom of the crane taken from the line 7 7 of FIG. 1.

FIG. 8 is an enlarged transverse section-al view of the boom of the crane taken from the line 8 3 of FIG. l.

FlG. 9 is a fragmentary side elevational view of a modified form of the invention showing portions thereof broken away to amplify the illustration.

FG, 10 is an enlarged fragmentary sectional View taken from the line N ild of FIG. 9.

FIG. ll is an enlarged fragmentary top or plan view of the modified structure of the crane taken from the line ll-ll of FIG. 9.

FIG. l2 is an enlarged fragmentary view of the outrigger mechanism of the modied crane shown in FIG. 9 of the drawings; and

PEG. 13 is an enlarged fragmentary sectional view taken frm the line EL3-13 of FIG. 9.

As shown in FIG. 1 of the drawings, the crane is provided with a base 2d which is adapted to be secured on the upper surface 22 of a conventional hat truck bed 24. Extending upwardly from the base is a vertical member Z6 having a boom 23 mounted thereon and disposed to swing or pivot on a vertical axis.

The boom 23 carries a movable hoisting carriage 3i) powered hydraulically by means of an engine 32 which is coupled with a hydraulic pump 29 and solenoid valve controls 3d which are operated by a remote switching mechanism 36.

It will be seen that the hydraulic power equipment including the engine 32 is at one end of the boom 23 while the hoisting mechanism 3@ is disposed near the other end whereby the power equipment tends to provide a certain degree of balance for the boom 28 about its pivotal axis which is concentric with the vertical member 26.

This member 26 is provided with angular braces 36 and 3S. There being two of the braces 33, one on each side, which interconnects the Vertical member 26 and one of the hollow tubular horizontal members 40. These hollow tubular members it? are secured to a truck frame i2 by means of clamp bolts da which extend downwardly through the bed 2d of the truck and are xed by crossplates to the frame d2.

Telescopicaly mounted within the hollow tubular hori- Zontal base members 4@ are horizontally extendable hollow tubular members do having angle plates 4S on the extending ends thereof. Between these angle plates 4S lare legs 50 held thereon by pins 52. The lower ends of the legs Sil are provided with feet 54 which are disposed to rest on the ground outboard of the truck bed 2d in order to brace the truck bed against tilting action when the boom 28 of the crane is cantilevered outwardly be yond the bed of the truck.

When the legs Si) are removed from the ground they tay be released from the angle plates 43 by removing the pins 52 whereupon the legs Sti may be stowed in the hollow tubular members 46 which [may be telescopically retracted into the hollow tubular base members 40 wherein they are retained during transit.

As shown in FlG. 3 of the drawings, a bearing housing 56 is rotatably mounted on the upper end of the vertical member 2e and carries the boom 2S. The housing 56 is provided with an enlarged lcylindrical Ibearing portion 52% which tits over roller bearing 59 on the vertical member 26. The vertical member 26 extends upwardly internally of the bearing tube Se to carry the bearings and lend support thereto.

The boom 28 is preferably welded to the bearing housing 55 and is a cantilever boom of generally l beam construction.

As shown in FIG. 7 of the drawings, the boom 2S is provided with lower iianges d2 engaged by carriage rollers 6dwhich traverse the upper surfaces of said flanges 62. These rollers 64 `are :rotatably mounted on the carria-ge 3) which also carries `guide rollers 68 mounted on vertical axis and engaging the edges of the flanges 62 in order to provide lateral stability ot the carriage 30.

The carriage 3b is also provided with a pair of spaced pins 79 :and 7l forming axles for sheaves 72 and 73 which are suspended near the lower portion of the carriage El@ as shown best in FiG. l of the drawings.

A cable ic-l is anchored at one end 76 to the bearing housing 56 and this cable 7d passes over the sheave "/'-3 and partially around `a hoist cable sheave 7S suspended between the sheaves 72 and 73. The cable 74 also passes over the sheave 72 and extends around the end of the boom Z8 in engagement with sheaves Stl and 82 which are rotatably supported between plates `84 at the outboard end of the boom 28.

The cable 74 then passes over a multiple sheave 84 fixed by means of brackets 36 to the upper outboard e-nd of the boom '28. The cable '74 also passed over a multiple sheave structure 33 carried by a plunger 9i) of a hydraulic cylinder 92 which is anchored by means of a pin 96. The opposite end of Ithe cable 74 is anchored to the boom at 57.

The :gussets 94 are disposed between the boom 2S and the bearing housing Se and are welded thereto. Thus, the hydraulic cylinder $2 is maintained stationary while its plunger 9@ is capable of moving the multiple sheave 58 relative to the stationary multiple sheave 84. The cable 74- `being alternately and successively engaged with the multiple sheave structures 84 and 8b tends to multiply the longitudinal displacement of the cable 74 in comparison to the longitudinal movement of the plunger 90 of the hydraulic cylinder 92. Thus, the hoist sheave 7S may be raised a considerable distance with a comparatively lesser travel of the hydraulic cylinder plunger 9i).

Fixed to the carriage Sti at 98 is one end of a cable 180 which passes over a multiple sheave 102 stationarily mounted on the side of the boom 2d. This cable 16% also passes over .a multiple sheave itl/t carried by a plunger 1915 of a hydraulic cylinder 1% stationarily mounted on the booml by a pin il@ passi-ng through the opposite end ot" the cable tot? is xed to the multiple sheave ldd at l`lli a mounting plate 111 Iwhich is preferably welded to the boom 2S.

The sheaves liti?. and 164 multiply movement of the cable litt) with respect to the movement of the plunger 166 of the hydraulic cylinder 108 so that this cable ltti is disposed to retract .the carriage ti along the flanges 62 of the boom 28 in a direction toward :the vertical member 28 while another cable M2 is disposed to move the carriage 30 in the opposite direction.

This cable H2 is xed to the carriage 30 at 14 and passes over a multiple sheave 116 tixed to the boom 2S and also passes over a movable sheave MS carried by a plunger 112i) of a hydraulic cylinder i122 stationarily mounted by a pin 123 to an anchor member T Zf-t which is preferrably welded to the side ot the boom The cable 112 is fixed to lthe sheave lid at dil. it will be seen that the hydraulic cylinder 22 is similar in action to the hydraulic cylinder d68 but moves the carriage 3i) in the opposite direction toward the ioutboard end of the boom 28.

Carried by the bearing housing 55 is a frame 126 which supports the engine 32, a hydraulic pump driven thereby, `an electrical battery .328, a hydraulic reservoir Lit," and the solenoid valve assembly 34. Additionally, this iframe 126 support-s a hydraulic cylinder 132 which operates to rotate the boom 28 about 4a vertical axis concentric with the vertical `frame member 26.

As shown in FIG. 2 of the drawings, the hydraulic cylinder 132 is provided with a plunger l155i carrying a cross head i3d on which a pair of sprockets 13S and 140 are rotatably mounted. A :chain M2 is anchored to the trame .T26 at 144 and passes `over the sprockets L33 and jllti thence over an -idier sprocket 146 stationarily mou-nted on the frame 126 by a pin 148. The chain M2, then passes over a sprocket l5@` which is ixed to the vertical member 26. The chain then passes over another pair of sprockets 152 and 154 also carri-ed by the cross head 135 actuated in lconnection with the plu-nger 134 of the hydraulic cylinder 132. These sprockets 152 and 15-4 are rotatably mounted on axles 156 and 15S.

The opposite end of the chain M2 from its end 144 is station-arily tixed to the trame L25 by a bolt 160.

It will be seen that reciprocal action of the plunger 134 of the 'hydraulic cylinder 132 causes reciprocal movement of the chain over the sprockets 13S and 146i and 152 and 154 thereby causing relative rotational movement of the trame Z about the axis of the sprocket T59 which is held stationarily on the vertical member 26 of the crane base. Since the trame -126 is `fixed to the bearing housing 56 torque reaction is applied to this tube and thus the boom 23 is `forced to pivot about the axis of the vertical member 2d of the base frame Zt).

The battery 128` is used as a conventional mea-ns for starting the gas engine 32 `and also is used to power the solenoid valves 3d which are controlled by a switching mechanism 3'6 to admit hydraulic fluid under pressure to the various hydraulic cylinders hereinbetore described. The switching mechanism 36 is provided with a plurality of buttons 37 which selectively may be used to operate the various solenoid valves and respective hydraulic cylinders hereinbefore referred to for moving the carriage 30 backwardly `and forwardly, or for retracting the cable 74 to raise the hoist sheave 78, or to energize the hydraulic cylinder 132 )and swing boom 2S about the vertical axis of the trame mem-ber 26.

In operation the crane of the present invention is completely powered by mechanism carried on the swinging boom of the crane. The base 2@ provides a simple mount for the crane and m-ay be attached to any flat bed truck Without undue complications. This base also supports the telescopic members iti which are arranged 'to brace the truck bed by means 'of the legs Sti having :the feet 54 which are vertically adjustable to engage the ground laterally of the truck.

Thus, all of the elements necessary to convert an ordinary flat bed truck to a crane truck are provided in the crane of the present invention. The basic mechanism of the truck is not `altered when the crane of the present invention is installed thereon and there is no power mechanism for operating the crane below the surface .of the truck bed. Furthermore, the power mechanism including the engine 32 and other related equipment tends .to counterbalance the boom 23 to a certain extent and also oper- `ates all of the carriage traverse mechanism as well as the hoisting mechanism and also the means for swinging the cantilever boom 28 about its vertical axis.

The use of hydraulic cylinders operated by an engine on the boom provides a very compact means for obtain- J ing suiiicient power to hoist heavy loads by means of the hoisting sheave 78. While maintaining the over all power and boom structure relatively compact and easy to service.

In the modified structure of the invention as shown in FiG-S. 9 to 13, inclusive, of the drawings the base of the crane is adapted to rest on the upper surface 22 of a truck bed 24 similar to that shown in FIG. l of the drawings.

This base designated 162 is fixed to the lower end of a vertical member 164 and the base 162 is provided with three horizontal members 166 as shown in FIG. l2 of the drawings. These horizontal members are provided with angular braces 168 which are iixed at their upper ends to the vertical member 164.

Fixed to a pair of these braces 16S and directed toward opposite sides of the base 162 are spaced plates 179 between which Outrigger legs 172 are each pivotally mounted on a pin 174 which extends through both plates 78.

ri`he lower ends ot' the legs 172 are provided with feet 176 which are hinged thereto by pins 178. These feet 175 envage the ground and the legs 172 may be braced by a chain 129 having a clevis 182 coupled to the leg and having the opposite end of the chain coupled to an i bolt 184 fixed to the truck bed. Thus, the legs 172 may be prevented from spreading when a heavy load is applied thereto.

These legs 172 may be pivoted upwardly in the direction of the arrow as shown in FIG. l2 of the drawings and secured in the broken line position A when in transit. The pins 171- permit the legs 172 to be pivoted upwardlyy into said broken line position.

As shown in FIG. i3 oi the drawings, the vertical frame member 1nd is provided with a shoulder plate 18e iixed thereon. Supported on this plate is a roller bearing ESS which surrounds the circular in cross section structure oi the vertical member 164. Mounted on the outer race of the roller bearing 183 is a sleeve 19t) to which the lower end of a bearing housing 122 is fixed. Fixed to the upper end of the bearing tube 192 is a sleeve 194 in which the outer race of another large roller bearing 1% is supported. The inner race of this bearing 196 engages the periphery of the vertical member 164 and this upper race 198 is held in position by a bearing cap 2de secured to the vertical member 164 by means of bolts 232.

The bolts 222 also secure a sprocket 204 onto the upper end of the vertical frame member 164 which as liereinbetore described is held stationary on the frame or bed or" the truck. It will be noted that the base of the modified structure of the invention is secured to the frame and bed of a tlat bed truck in a similar fashion to that of the structure shown in FlG. 1 of the drawings.

interposed between the bearing plate 2d@ and the ring 19d is a seal 2% and interposed between the shoulder plate 135 and the ring 1% is another similar seal 2tlg. These seals .2G-5 and 20S prevent foreign matter from reaching the bearings 18S and 1%.

As shown in FiG. ll of the drawings, a boom 219 is supported by the bearing housing 192. This boom as will be hereinafter described in detail is structurally triangular in cross section to withstand various loading including twisting moments.

The boom 2li) is swingable about the axis of the sprocket 26e by means of a double ended hydraulic cylinder 212 having oppositely directed plungers 214 and 216. The cylinder 212 is iixed to the boom 21@ and coupled to the ends of the plungers 21d and 216 by means of pins 213 and 229, respectively, is a chain 222.

The chain 222 passes over the sprocket 294 and also extends over a stationarily mounted sprocket 224 which is rotatable about a bearing shaft 226 held stationarily 'oy a fixture 22S welded or other Wise secured on the `pper surface of the boom 210.

Reciprocal action of the plungers 214 and 216 causes torque reaction to be applied to the boom 21h around the axis of the iixed sprocket 204. Thus, the boom of the crane is pivoted.

Carried by the bearing tube 192 is a power equipment frame 23@ which carries an engine, hydraulic pump, battery, hydraulic reservoir, solenoid valves and other equipment similar to that as shown in FIG. l of the drawings.

As shown in FIG. l0 of the drawings, the boom 210 is triangular in cross section and structurally arranged to resist twisting moments which may be applied when the truck being loaded and unloaded is located on a side hill and when the vertical frame member is tilted at an angle to the vertical.

Disposed internally of the boom 21d is a hydraulic cylinder 232 which is stationarily anchored to the bearing housing 192 by means of a pin 234. This hydraulic cylinder is provided with a plunger 236 having a multiple sheave 23S over which a cable 240 is engaged. This cable is also engaged over a multiple sheave 242 near the outboard end of the boom 210 and this cable also passes over sheaves 244 and 246 at the outboard end of the boom thence the cable 24) passes over sheaves 2448 and 250 on a carriage 252 which is similar to the hereinbefore mentioned carriage 3i). Between the sheaves 248 and 25d, the cable 24;@ engages a hoisting sheave or pulley 254.

The sheave or pulley 254 serves as a component of a load-carrying means including a conventional block cube engaging fork, not shown, but which is a conventional device. Thus, the load-carrying means, of which the pulley 25d is a part, is normally below the power operated hydraulic components of the invention, even when the load-carrying means is in its loading position whereby the movement of the carriage 3@ along the boom of the crane and during the slight swinging movement of the load, all of the power operated components are above the load and are not subject to damage thereby.

It will be understood that the loading of cubes of concrete blocks on a truck bed may be hazardous to surrounding equipment and for this reason, the power operated components, including the motor, the hydraulic cylinders and the actuating mechanisms, are all positioned above a loading position of the load-carrying means and the load so that such important equipment is not subject to damage by swinging or movement of the concrete blocks or the load-carrying means.

The carriage 252 is provided with rollers 255 which engage legs 258 and 260 of channels 262 and 264, respectively. These channels being fixed to the lower side of the boom 219. The carriage 252 is thus similar to the carriage 3@ described in connection with the structure shown in FIG. l of the drawings.

Disposed between the channels 262 and 264 is a hydraulic cylinder 266 which is a double ended cylinder having a plunger 26S at one end and a plunger 270 at the other end.

Carried by the plunger 263 is multiple sheave 272 having a cable 274 engaged therewith. This cable 274 also passes over a multiple sheave 276 stationarily mounted on the bearing housing 192. The cable 274 is thus retracted by a multiple action over the sheaves 272 and 276 to move the carriage 252 in one direction while a cable 278 is engaged over the multiple sheave 281B carried by the plunger 2763. This cable 27S is also engaged over a multiple sheave 282 near the extending end of the boom and stationarily mounted. Thus, the carriage being coupled to the cable 273 is powered in the opposite direction from that caused by actuation of the cable 274.

lt will be apparent to those skilled in the art that the operation of the boom 21d is similar to the operation of the boom 28 and that this boom carries all of the power equipment necessary to swing it and also to opsaid crane adapted to be supported by a truck; a boom supporte-d on said base and disposed to swing on a vertical axis; a motor carried by said boom; first means oper-able by said motor for swinging said boom about a vertical axis; and vertically movable load carrying means suspended from said boom, said motor and said first mean-s both disposed above a loading position of said vertically movable load carrying means and articles carried thereby, all the structure of said base disposed above a bottom plane of said base which is adapted to rest on a truck bed.

7. ln a crane for trucks the combination of a base for said crane adapted to be supported on a truck; a boom supported on said base and disposed to swing on a vertical axis; a motor carried by said boom; first -means operable by said motor for swinging said boom about a vertical axis; a carriage movable longitudinally of said boom; second means operable by said motor for moving said carriage longitudinally of said boom; third means coupled to said carriage and operable by said motor for hoisting articles relative to said carri-age; and vertically movable load carrying means of said third means suspended from said carriage, said motor, first means and second means all disposed above a loading position of said vertically movable load carrying means and articles carried thereby, all the structure of said base disposed above a bottom plane of said base which is adapted to rest on a truck bed.

8. In a crane for trucks the combination of: a base; a vertical member extending upwardly therefrom; a boom swingaole about a substantially ver-tical axis of said vertical member; a motor carried on said boom; a pressure huid means operable by said motor; a pressure `fluid cylinder on said boom and having a plunger extendable and retractable relative thereto; flexible means coupled to said plunger; second means fixed on said vertical member and engaged by said exible means to provide torque reaction of said boom about the vertical axis of said vertical member; and vertically movable load carrying means suspended from said boom, said motor, pressure fluid means, pressure fluid cylinder, flexible means and said second means all disposed above a load carrying position of said vertically movable load carrying means and articles carried thereby, all the structure of said base disposed above a bottom plane of said base which is adaptable to rest on a truck bed; means coupling said pressure fluid cylinder to said pressure uid means for operating said pressure fluid cylinder by said motor, said second means operable by said motor.

9. ln a crane for :truck beds the combination of a base; a vertical member extending upwardly therefrom; a boom swingable about a substantially vertical axis of said vertical member; -a motor carried on said boom; pressure fluid means operable by said motor; a pressure fluid cylinder on said boom and having a plunger extendable and retractable relative thereto; a lirst flexible means coupled to said plunger; a second means fixed on said vertical member and engaged by said first ilexible means to provide torque reaction of said boom about the axis of said vertical member; la second pressure huid cylinder having a movable plunger; a carriage movable longitudinally of said boom; and second ilexible means coupled to said second cylinder for actuating said carriage on said boom; and vertically movable load carrying means suspended from said carriage, said motor, pressure fluid means, first and second pressure fluid cylinders, said first and second flexible means and said second means all disposed above a load carrying position of said vertically movable load carrying means and articles carried thereby, all the structure of said base disposed above a bottom plane of said base which is adapted to rest on a truck bed, all of said pressure fluid cylinders and said exible means coupled to and operable by said motor.

110. In a crane for truck beds the combination of: a base; a vertical member extending upwardly therefrom; a boom swingable about a substantially vertical axis of said vertical member; a motor carried on said boom; pressure fluid means operable by said motor; a pressure fluid cylinder on said boom and having a plunger extendable and retractable relative thereto; a first llexible means coupled to said plunger; a second means fixed on said vertical member and engaged by said rst ilexible means to provide a torque reaction of said boom about the axis or said vertical member; a second pressure fluid cylinder having a movable plunger; a carriage movable longitudinally of second boom and said exible means coupled to the plunger of said second cylinder for actuating said carriage on said boom; a third pressure iluid actuating cylinder supported on said boom and having an extendable and retract-able plunger; third flexible means coupled to said last mentioned plunger and supported intermediate its ends on said carriage for hoisting articles relative thereto; and vertically movable load carrying means suspended from said carriage, said motor, pressure huid means, first means, second and third pressure fluid cylinders, said first, second and third exible means and said second means all disposed above a load carrying position of said vertically movable load carrying means and articles carried thereby, all lthe structure of said base disposed above a bottom plane of said base which is adapted to rest on a truck bed, all of said pressure fluid cylinders and said flexible means coupled to and operable by said motor.

11. In a crane or loading and unloading trucks the combination of: a normally vertical means adapted to be supported on a truck; a normally horizontal boom pivotally mounted on said vertical means and on a normally vertical axis; a motor on said boom; first means operable by said motor and disposed to swing said boom about said vertical axis; a carriage movable longitudinally of said boom; second means operable by said motor `for moving said carriage back and forth on said boom; llexiblemeans retractably suspended from said carriage; third means operable by said motor for retracting said flexible means relative to said carriage, said motor, 4first means, carriage, second means, tlexible means and third means all disposed to swing above and clear a load placed on said truck by said crane; and vertically movable load carrying means `of said third means suspended from said carriage, said motor, iirst, second, and third means all disposed above a loading position of said vertically movable load carrying means.

12. AIn a crane for trucks the combination of: a base for said crane adapted to be supported on a truck; a boom supporte-d on said base and disposed to swing on a vertical taxis; a motor for swinging said boom about Ia vertical axis; a carriage movable longitudinally of said boom; second means operable by said motor for moving said carriage longitudinally of said boom; third means coupled :to said carriage and operable by said motor for hoisting articles relative to said carriage, said boom, motor, first, second, and third means all `disposed to swing above and clear a load placed on said truck by said crane; and vertically movable load carrying means of said third means suspended from said carriage, said motor and said second means disposed above a load carrying position of said vertically movable load carrying means and articles carried thereby.

Referenees Cited in the file of this patent UNITED STATES PATENTS 700,162 Wiley May 13, 1902 2,272,949; Kidder Feb. 10, 1942 2,365,169 Billings Dec. 19, 1944 2,557,484 Wagner June 19, 1951 2,559,733 Pitman July 10, 1951 2,730,249 Edwards Jan. 10; 1956 2,772,794 Cramer Dec. 4, 1956 2,772,795 Cramer Dec. 4, 1956 2,794,557 Vero June 4, 1957 2,798,622 Kelley et al July 9, 1957 2,828,868 Odoran Apr. 1, 1958 2,998,149 Bopp Aug. 29, 1961 3,023,914 McGuire et al Mar. 6, 1962

Claims (1)

1. IN A CRANE THE COMBINATION OF: A BASE FRAME ADAPTED TO BE SECURED ON A TRUCK; HORIZONTAL MEMBERS ON SAID BASE FRAME; ARMS HORIZONTALLY AND TELESCOPICALLY CONNECTED TO SAID HORIZONTAL MEMBERS; VERTICAL LEGS SECURED TO SAID ARMS AND HAVING FEET ENGAGEABLE WITH THE GROUND TO PROVIDE AN OUTBOARD BRACE AND SUPPORT FOR SAID TRUCK; AND A CRANE BOOM PIVOTED ON SAID BASE FRAME ABOUT A VERTICAL AXIS, SAID BOOM OF A LENGTH TO EXTEND BEYOND SAID BASE FRAME AND OUTWARDLY OF SAID TRUCK; A HOIST CARRIAGE MOVABLE BACK AND FORTH LONGITUDINALLY ON SAID BOOM; FLEXIBLE MEANS COUPLED TO SAID HOIST CARRIAGE AND DISPOSED IN OPPOSITE DIRECTIONS LONGITUDINALLY OF SAID BOOM; MEANS CONNECTED TO SAID FLEXIBLE MEANS FOR ACTUATING SAID HOIST CARRIAGE IN SAID BACK AND FORTH DIRECTIONS; A LOWERMOST PORTION AND ALL THE OPERATING STRUCTURE OF SAID CRANE, AT SAID BASE, DISPOSED TO BE SUPPORTED ON A TRUCK BED AND THEREABOVE, SAID HORIZONTAL MEMBERS ALSO DISPOSED TO BE LOCATED ABOVE A TRUCK BED WHEN SAID CRANE IS SUPPORTED THEREON.

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