CA1300560C - Truck loading apparatus - Google Patents

Abstract

ABSTRACT

This invention provides an improvement in a truck bed unloadable from the sides thereof. The improvement comprises upright members at the front and back ends of the truck bed; a rail beam positioned longitudinally of the truck bed, parallel thereto, and supported at the distal ends thereof on the front and back upright members; a wheel trolley fixed to the rail beam and movable longitudinally thereon between the distal ends;
a telescopically movable arm supported on the wheel trolley and extending over the side of the truck bed; an upright shaft member depending from the distal end of the telescopic arm; a fork lift assembly fixed to the upright shaft and movable along the shaft and including lift bars extending horizontally; and control means for controlling the movement of the wheel trolley on the rail beams, telescopic movement of the arm, rotational movement of the depending shaft and the fork lift assembly, and the vertical movement of the lift assembly on the depending shaft.

Description

_CKGROUND OF THE INVENTION

Field of the Invention This invention relates generally to improved apparatus and system for loading and unloading containers onto and from the bed of a truck.

D r_ption of the Prior Art Con-tainers such as soft drink cases on loaded pallets are oEten stacked on the becl of A truck Eor transportation to an unloading site where they are unloaded. In many situations, for example, cases of beverage are individually and manually unloaded, placed on a hand cart and wheeled into a store or tavern for retail distribution. This unloading procedure is laborious and time consuming. Other delivered material loaded on pallets may be too heavy for manual unloading and require unloading apparatus separate and distinct from the truck carrier. Such unloading apparatus, for example, a fork lift truck or an overhead crane, are expensive accessories for truck unloading operations which may be requ~red only occasionally.
The prior art truck loading and unloading apparatus which are combined with the truck bed that I am aware of are positioned on the truck bed reducing to a considerable extent the carrying capacity of the truck bed. Such loading and unloading apparatus require such modi.Eication to the truck that the entire truck structure is modified making such an adap-tation impracti.cal to an existing truck. Such prior art cranes or loading and unloading apparatus may be ~3~i6~

practically designed only for newly manufactured trucks or truck beds.
~ urther, few if any existing truck unloading mechanisms are capable of use with beverage or like ~rucks which have roofs that cover the cargo area.

SUMMARY OF THE INVENTION
In accordance with an embodiment oE the present in~ention there is provided a cargo-unloading apparatus in combination with a truck of the type that has an elongated body enclosing cargo-carrying space which is covered by a permanent roof, and along whose oppositely directed sides are openings to allow loading or unloading of cargo into and out of the cargo space from the sides of the body and which body also has a transverse end.
The cargo-unloading apparatus comprising: track means mounted longitudinally along the roof; a carriage mounted to the track means; an arm having an extendable portion mounted on the carriage and carried by that carriage so as to be moved along the roo~, the arm and carriage being so constructed and mounted so as to allow the positioning of the extendable portion outward of any one of a range of positions along one of the other of the opposite directed sides and for the arm to re~ol~e about a generally vertical axis so as to mo~e the extendable end about one transverse end of the truck body; projecting means which may releasably engage cargo for lifting and carrying the cargo; powered and controlled depending means connected to the extendable portion of the arm and mounting the projecting engaging means; the powered and controlled means and the arm being controllable so as to mo~e the projecting members deep into the cargo space under the roof at any number of different locations along the side of the body, through an opening therein, for lifting cargo therefrom and carrying it out and ~30VS6~

depositing it adjacent to the truck; and whereas the extendable portion and the depending means may be swung from one oppositely directed side of the body to the other oppositely directed side about a transverse end of the body, without the need to remove or raise the depending means, so it may serve to unload or load from either side.
In accordance with another embodiment of the present invention there is provided unloading apparatus for retrofitting to a beverage truck of the type that has an elongated body enclosing a cargo-carrying space which is covered by a permanent roof and along whose oppositely directed sides are openings to allow loading or unloading of cargo into and out of the cargo space from the sides of the body and which body also has transverse ends and a structural framework comprising: framework and track means for being secured to the structural framework of the body at its transverse ends and including a longitudinal track for being mounted on or above the roof of the body; a carriage mounted to the track means for moving along the longitudinal track; an arm having an extendable position mounted on the carriage and carried by that carriage so as to be moved along the track, the arm and carriage being so constructed and mounted so as when mounted to the truck body they allow the positioning of the extendable portion outward of any one of a range of positions along one or the other of the opposite directed sides and to move the extendable end about and around one transverse end of the truck body from one oppositely directed side to the other oppositely directed side; projecting means which may releasably engage cargo for lifting and carrying the cargo; powered and controlled depending means connected to the extendable portion of the arm and mounting the projecting engaging means; the powered and controlled means and the arm ~36)~:3S~(~

being controllable so as to move the projecting members deep into the cargo space under the roof at anv number of different locations along the side of the body, through an opening therein, for lifting cargo ~herefrom and carrying it out and depositing it adjacent to the truck;
and whereas the extendable portion and the depending means may be swung from one oppositely directed side of the body to the other oppositely directed side about a transverse end of the body, without the need to remove or raise the depending means, so it may serve to unload from either side of the truck body.
According to one feature of the present invention, the material handling apparatus constructed in accordance with an embodiment of my invention may be easily combined with an existing truck or truck bed without sacrificing truck bed space and without extensively redesigning the truck to accommodate disturbance of lifting forces for which the truck was not designed. The material handling apparatus of my invention may be added to prior art trucks without the necessity of extensive redesign of the truck bed. My apparatus though capable of handling heavy loads is uniquely structured to maintain the stability of the truck bed for which it was designed. The present invention may include fork lift arms generally horizontally oriented which are supported on a vertical mast. The top end of the vertical mast may be supported at the end of a telescoping arm extending horizontally from a trolley carriage which travels on a horizontally positioned rail or track longitudinally positioned over the bed of the truck. The rail may be supported over the bed and centrally thereover on upright posts ~t the forward part and rearward part of the truck bed.
Separate motor devices may be provided on the longitudinal rail to move the trolley carriage longitudinally over the truck bed and to extend and - 3a -'"

~3~

retract the telescopic arm as well as to lift and lower and otherwise manipulate the fork lift.
Other advantages are obtained from the unique and novel structure of my invention and which will become apparent upon a reading of the following detailed description while referring to the accompanying drawings which illustrate a preferred embodiment of this invention.
In this specification and in the claims we will occasionally use the term "beverage truck" by which we mean a large truck whose covered body has side doors along its length to expose cargo covering areas and from which and to which cargo is loaded. Such trucks are commonly used for delivery of multi-case lots of canned and bottled soft drinks and beer. Although termed herein beverage truck it is understood that the term identifies such a truck no matter what may be the actual cargo.

BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a beverage truck incorporating the present invention.
FIG. 2 is a skeletonal view of the same truck with the body and cargo removed to show its structural framework and - 3b -~3~

the manner of affixing the improvements of -the present invention thereto.
FIG. 3 is a detailed perspective view with parts broken away of a portion, namely the -trolley, of the inventive structure.
FIG. 4 is a plan view, partly in section, with parts broken away, of a portion of the apparatus of FIGS. l ancl 2 showing a t.rack for the trolley of FIG. 3.
FIG. 5 is an elevational view o:E one part of the inven-tive apparatus of FIGS. I - 4, showing a telescoping arm that is mounted to the trolley of FIG. 3.
FIG. 6 is a plan view of the telescoping arm of FIG. 5 shown in its extended position.
FIG. 7 is a top view of the truck body of FIG. l with parts shown in moved positions and illustrating different moved positions of parts in phantom outline.
FIG. 8 is an~end elevational view of the truck of FIG.
l showing moved positions of parts in phantom lines.
FIGS. 9 and 10 are each a fragmentary view similar to FIG. 8, with respectively a ~oved position and an interior part, shown in phantom outline.
FIG. 11 is an elevational side view of the fork lift portion of the apparatus of E'IGS. 1 - 10.
FIG. 12 is an elevational front view of the apparatus of FIG. 11.
FIG. 13 is a partial perspective view of the truck similar to that of FIG. 1, showing parts in moved posi-tions and wi-th the fork lift in its storage positionO

~ 3~ J~

FIG. 14 .is a schematic view of the control and power circuits of the truck of FIGS. 1 - 3.
FIG. 15 is a side view of the truck of FIGS. 1 - 14 showing, the control and power circuitry.
FIG. 16 is a top view of the truck body of FIG. 15 again showing the control and power clrcuitry.

Detailed _escription of One Embodiment of the Invention_ _ Referring to FIG. 1, there is depieted a beverage truek 8 having a eonventional eab 9 and a body 10. The body 10 has a roo:E 12 that substantially eovers a eargo area, and side walls 14 comprised oE a number of overhead doors 16 that may be raised (as is the door 16 ) to allow aecess to a compartment 18 sized to receive a stacked load of cases 110 of, for example, canned beer or soft drinks. As thus described the truck 8 is, more or less, conventional.
In accordance with the present invention, howeverl the truek 8 is provided with a unique unloading and loading apparatus, generally designated by the number 20.
The apparatus 20 eomprises a framework ineluding rear supports 22, 24 and front supports 26, 28 (seen better in FIG. 2) that are seeured to the body frame lOF at its front and rear seetions. The framework made up of supports 22, 24, 26, 28 serves to support a track unit 30 tha-t runs longitudinally along and above the roof 12 along the roo.f's longitudinal centerline.
The track 30 i.s~made up of two parallel I-beams 32, 34 affixed as by bolting at either end to cross supports 36f 38 13~

that respectively are similarly affixed atop the rear supports 22, 24 and front supports 26 and 28.
Mounted on-the track 30 for movement along the track is a trolley unit 40. The -trolley 40, as may be seen better from FIG. 3, preferably comprises a box-like framework having top and bottom plates 42, 44 that overlay and underlay the I-Beams 32, 34 and span between them. The plates 42, 44 are secured to trolley side walls 46, 48 which also mount, as by bolts and nut units 41, a set of wheels, four to each side, .including large upper wheels 43 and slightly smaller lowe.r wheels 45. These wheel.s 43, 45 ride on the interior flanges of -the I-beams 32, 34.
The trolley 40 has, as is also shown in FIG. 3, additional support walls 47 spaced between the plates 40, 42 and the walls 46, 43 at right angles thereto to form a box like structure. The top and bottom plates 42 and 44 have a circular opening 49, 490 that receives and helps support a thrust bearing which depends from an arm unit 50 (FIGS. 1 and 2).
As also generally shown in FIGS. 1 and 2, and depicted in more detail in FIG. 4, the trolley 40 is moved along the track 30 by a powered and controlled chain drive system 60 that includes a motor 61 moun-ted to drive a sprocket 62 mounted between the I-beams 32, 34 at the front of the track 30. The sprocket 62 drives a chain 63 which runs to a second, freewheelin~, sprocket 64 similarly mounted at the opposite end of the track 30. The chain passes under the trolley 40 and around the two sprockets and has its ends ~L3~ 6l~1 attached to opposite sides of the trolley (FIG. 2). Thus the trol.ley forms a link or part of the loop of the chain 63 such that operating the motor 61 in one direction drives the trolley 40 forward along the track 30 and by reversing the motor 61 moves the trolley rearward. And, by stopping the motor, the operator secures the trolley 40 in any desired longitudinal position between the sprockets 62, 64.
As is conventional with such a drive, limit switches are provided for stopping the motor when trolley 40 reaches its frontmost and rearmost positions. (As such are conventional they need not be and are not detailed here.) ~ s mentioned above, the arm unit 50 is pivotally mounted to the trolley 40 so that it may freely rotate in a horizontal plane. For ease of use and safety reasons this is preferred to be a simple unpowered pivot, which may be easily and manually moved as will be explained below.
The arm 50 is a telescoping arm, which as better shown in FIGS. 5 and 6, can extend from a retracted position to an extended position and is controlled to move to and be held at any intermediate extension. The arm 50 preferably is, as shown, made up of three inter-telescoping cylinders 51, 52, 53 driven by a hydraulic ram 50R. The largest cylinder 51 has its base secured at 54 to a framework 55 that includes a bearing plate 56 and a thrust bearing 57.
The thrust bearing 57 is received in the hole 49 ~FIG. 3) of the trolley 40. `Hydraulic fluid is supplied to ram 50R
from a suitable source mounted on the truck through a hose and reel arrangement 70 best shown in FIGS. 1, 2, 15 and 16.

3L3~

The hose and reel apparatus 70 includes a reel 72 mounted at the front of the track 30 from which a double hose set 74 runs to,a second reel 76 mounted adjacent to the base of the cylinder 53. The hose set 74 is coupled to a set of solenoid valves 75, 76, 77 and 77' mounted at the front end 58 of the arm unit 50. One of these four-way valves serves to feed or drain hydraulic fluid to the ram 50R to extend or contract the arm 50. The other three valves' functions will be exp:Lained below.
Mounted at the end 58 oE the arm unit 50 is a Eork l:ift assembly 80. This assembly 80 includes a turntable arrangement 82 that has a driven gear wheel 83. Wheel 83 revolves in a horizontal plane and is driven by a drive gear 84. Drive gear 84 is in -turn driven by a hydraulic motor 85. The motor 85 is controlled by one of the valves 75 -77 to drive the gear 84 and rotate the gear wheel 83 and thus the entire fork lift assembly 80 in either direction.
This can perhaps best be appreciated from FIG. 7, wherein the extended arm 50 allows the fork lift 80 to be rotated in a circle 89. Note that the fork lift assembly is free of the side wall 14 of the body 10 of the truck when it is so rotated.
The fork lift assembly 80, as best seen in FIGS. 1 and 2, comprises a vertical rectilinear frame 87 which serves to support the fork unit 90, and its load. The frame 87 also serves as a vertica,~ track upon which the fork unit 90 may trave].. `~
The fork uni,t 90 is moved up and down by a triple 3~30(~S~

cylinder ram arrangement 88. The ram cylinder 88 is controlled and powered via a double hose connection 91' from the valve 77. ~s shown in FIG. 8 this cylinder 88 may vertically move the fork unit 90 up and down the frame 87 from the ground (shown in phantom lines in FIG. 8) to a much hi.gher position (also shown in phantom lines). The unit 90, includes wheels 90W (FIGS. 11 and 12) that travel on the frame 87 to decrease friction as the fork unit moves along it.
The fork unit 90 al.so has a uni~ue controlled system for tilting a pair o:E projecting members or Eorks 91 at an angle to the horizontal as shown in FIG. 9. This is achieved by providing a pivot at line 92 (FIGS. 11 and 12) and a hydrau-lic cylinder 93 between the frame 87 and the fork carriage.
As shown in FIGS. 9, 10, 11, 14 and 15 the loading or unloading apparatus 20 is provided with a control unit 100 connected by a cable 101 to the solenoid valves 75, 76, 77, and 77 and also to the solenoid valve 105 (FIG. 4) that controls the chain driven motor 61.
The control and hydraulic circuitry are shown schematically in FIG. 14. The hydraulic circuit can be traced from a pump P which is coupled to be selec-tively driven by the engine of the cab 9 (FIG. 15). The output of the pump P is fed over a line 150 to the valve 105 and thus to the motor 61. It is also fed over the outgoing line of the hose set 74 to t.he valves 75, 76, 7'7, and 77' to the motor 85, and rams 50R, 88 and 93. The return lines from these units are fed via the other line of the set 74 to a ~3~

reservoir 151. The pump P draws fluid from the reservoir 151 over a llne 152 through suitable filters, air bleeders and check valves to complete the hydraulic circuit.
The electric control circuit can be traced from chassis ground through a battery 160, which may be the conventional 12 volt battery of the truck 8. Although for convenience in depiction the connection 101 from the battery 160 is not indicated as being part of the cable 101 it is preferably combi.ned therein. The 12 volt potentially is fed in common to one side of each of 10 electrical switches o~ unit 100 which switches each, when closed, connects that potential to a solenoid coil that operates one of the valves 105, 75 -77 . In each case the other sides of such coils are connected to chassis ground to complete the electrical circuit to ground.
Thus, by operating standard controls on the module 100, the operator (e.g. the truck driver) may move the fork 90 as shown in FIG. 9, raise the fork assembly up or down as shown in FIG. 8, rotate the fork assembly 80 as shown in FIG. 7, move the trolley 40, arm 50, and the fork assembly 80 along the length of the body 40 and, as illustrated in FIG. 7, manually swing the arm unit 50 from one side 14 of the body 10 across the rail of the truck body 10 to the other side of the truck body 10~ And, of course, by operating a succession of these controls the operator can do all of these in combination.
Most importantly, of course, the operator may, as illus-trated in FIG. 10, move the Eor]cs 91 deep into the body 10 ~3~S16~

(FIG. 1) to remove Erom cargo compartments 18, the palletized cargo 110, and place it adjacent to the truck, e.g., on the ground or a loadlng platEorm.
Similarly, the apparatus 20 may be used to load cargo that is on pallets back into the truck 8 as to pick up misdelivered or overstocked goods Erom a store. Although the apparatus 20 can be used to load the truck 8 at a warehouse or like facility, it is believed that it will be found more economical to use conventional fork lifts to load directly onto the truck.
As shown in FIG. 1, the truck body 10 has a pair of holes 115, 116 above its rear bumper 117. These are openings into sleeves for receiving the forks 91. As shown in FIG. 13, when not in use and when the truck is driven the fork assembly 90 is conveniently stored at the rear of the truck with the fork 91 seated into these openings 115, 116.
The truck 8 and especially its body 10 preferably have an increased capacity air suspension to carry the added weight of the apparatus 20 and to counteract the tendency of the body to tilt when the apparatus 20 is in use. It may also be necessary or desirable to reinforce the frame lOF
from that of conventional units.
For purposes of illustration and definitions of disclosure but not for purposes of limitation, the following mechanical components and dimensions will be identified and given. These are the presently contempla-ted components and values Eor making the apparatus 20. The inventor is still, at this time of this writing, in the process of perfecting ~3Q~

th~ RpparatU~ and m~y well, ~or various r~ason~, de~lcla ~o vary and ~hang~ thes~ ln the futur~. Also ~ th~se c~mponen~ h~ve not yet been t~sted, it may b~ nec~sary to v~ry from tha~e for prac~Lca purpo~es. Such i3, 0~ ~OUrB~
~ully withLn the sXlll of the ordln~ry d~sign~r, Al~o, alShough balleved to be correct, error~ in co~putation or ~rRn~criblng ma~ occur and tho reader ~hould use the w~ll known engLneering technique3 to guard agaln~ the3e. Wlth ~uch cautlon~ the followlng are ~ubmitt~d ~or d~einlten~
dis~ uro and not ~or lLmit~t1~n~
C~mponan~ xa~ple ~t~nd~rd Cylinder R~m 50R ~HYCO DOUBLE AC'r. CYB. ~4Z-5~
~ear d4 5" PD GEAR x 'Ja5 PD x l.~a" x 2.25 ID *~AE 1045 ~eel 76 *GLEA~ON H06E REEL ~K18351~4 Cyllndar ~ *H~Co 91NGLB ACTIN~ CYL. ~43-75 Cylinder 51 5CH 20 PIPE x 10" NOM ~IA. ~A-513 Cylinder Sl BRONZE PL 1 1/2" x 3/4" x 2~"
wlth brldge~ , ~Oilite Cylind~r 52 SCH 20 PIPE x O" NOM. DIA. A-513 Cyllndcr 52 BR~NZE P~ 2 x 3/4" x 22"
wlth ~ridge~ OLlite Cylinder 53 SCH 40 PIPE x 6'l NOM. ~IA. A-513 Mot~r 61 VlCRE~S HYDR. MOTOR *MHT 3Z
~p~ock~ts 62, 64 12 TEETR x 3.86 PD *A8AB 2~
Roller Chaln 63 PITCH x 12 hA9A ~0 Y~lves 105, 75, 75, 77, 77' VlCKERS 4~WAY VALVE *DG 4V-3 Supp~rts 36, 3PJ fi" x 6~ x 3/P~" ~Lh *P~-36 Trad e MArk .X~' ~3~S~

~ramework 22, 3" ~IA. SCH 4~ PIP~, ~A-10 24, 26, 28 and cro~s support~
I-Ba~m~ 32, 34 ~s~8eL 6 x 12.5 lnah 1A-36 Cylind~r 93 *EN~RPAC 9 TON ~YV. CYL.
AND C~EV. ~XD 93 Fo~kE 91 1 1~4 x 4 ~ 36" KBHNAR PORK~
on a KE~INAR SHAPT TY. CARRIA~E
Several ~omponents o~ the desoribed embodlment may well, for ~afety, be enalosed by ~hleldY to pr~v~nt entry of extran00u~ ltems lnto the moving parto. ~ox examplo, the fl~embly ~0 may well be 30 ~hlelded to prevent the moving wheel~ 90W or ~ramework Ero~ c~olng harm.
Whlle one partlcular embodlment o~ the inv~ntion ha~ b~sn shown and de~crlbed, it will be obviou~ to tho~
~killed in the art tha~ ~hanges and modifiaation3 may be ~ada wlthout depa~ting from tha invention and, thereEora, the aim in the append~d alalm~ ia to cover all ~uah ahange~
and modifia~tion~ a~ all within the true spirit ~nd acope of th~ inv~ntlon.

~ Tr~do ~rk

Claims (11)

1. In combination with a truck of the type that has an elongated body enclosing cargo-carrying space which is covered by a permanent roof, and along whose oppositely directed sides are openings to allow loading or unloading of cargo into and out of the cargo space from the sides of the body and which body also has a transverse end, cargo-unloading apparatus comprising:
track means mounted longitudinally along said roof;
a carriage mounted to said track means;
an arm having an extendable portion mounted on said carriage and carried by that carriage so as to be moved along said roof, said arm and carriage being so constructed and mounted so as to allow the positioning of said extendable portion outward of any one of a range of positions along one of the other of said opposite directed sides and for the arm to revolve about a generally vertical axis so as to move said extendable end about one transverse end of the truck body;
projecting means which may releasably engage cargo for lifting and carrying the cargo;
powered and controlled depending means connected to said extendable portion of said arm and mounting said projecting engaging means;
said powered and controlled means and said arm being controllable so as to move said projecting members deep into the cargo space under the roof at any number of different locations along the side of the body, through an opening therein, for lifting cargo therefrom and carrying it out and depositing it adjacent to the truck;
and whereas said extendable portion and said depending means may be swung from one oppositely directed side of said body to the other oppositely directed side about a transverse end of said body, without the need to remove or raise said depending means, so it may serve to unload or load from either side.

2. The apparatus of claim 1, wherein said projecting means is a fork lift which includes a pair of forks, and means for controlled altering of the angle of inclination of said forks is provided so that they can be tilted up and down at various angles.

3. The apparatus of claim 1, wherein said arm includes means for controlled telescoping extension and contraction.

4. The apparatus of claim 3, wherein said projecting means project laterally from said depending means so that said projecting means may enter the cargo area as the arm is telescopically decreased in length.

5. The apparatus of claim 3, wherein said apparatus includes means for controlled revolving of the projecting means so that it can point toward or away from the body.

6. The apparatus of claim 5, wherein said projecting means are forks and said apparatus includes means for controlled raising and lowering of said forks.

7. The apparatus of claim 6, wherein said forks are at an angle to said depending means and said apparatus includes means for controlled altering of the angle of said forks relative to said depending means.

8. The apparatus of claim 7, wherein said means for altering the angle of said forks, the means for controlling, raising and lowering of the forks, the means for revolving the lifting device, and the means for controlled movement of a portion of said apparatus along said track, are all controlled from a control module located near said lifting device.

9. The apparatus of claim 5, wherein said projecting means is forks;
said apparatus includes means for controlled revolving the lifting device so that it can face toward or away from the body;
said apparatus includes means for controlled raising and lowering of said forks to decrease or increase the displacement of the forks from said arm; and said apparatus includes means for the controlled altering of the angle of said forks relative to the depending means.

10. The apparatus of claim 1, wherein said carriage is moved by a chain loop drive wherein the carriage forms a link in the chain loop.

11. Unloading apparatus for retrofitting to a beverage truck of the type that has an elongated body enclosing a cargo-carrying space which is covered by a permanent roof and along whose oppositely directed sides are openings to allow loading or unloading of cargo into and out of the cargo space from the sides of the body and which body also has transverse ends and a structural framework comprising:
framework and track means for being secured to the structural framework of the body at its transverse ends and including a longitudinal track for being mounted on or above the roof of the body;

a carriage mounted to said track means for moving along said longitudinal track;
an arm having an extendable position mounted on said carriage and carried by that carriage so as to be moved along said track, said arm and carriage being so constructed and mounted so as when mounted to the truck body they allow the positioning of said extendable portion outward of any one of a range of positions along one or the other of said opposite directed sides and to move said extendable end about and around one transverse end of the truck body from one oppositely directed side to the other oppositely directed side;
projecting means which may releasably engage cargo for lifting and carrying the cargo;
powered and controlled depending means connected to said extendable portion of said arm and mounting said projecting engaging means;
said powered and controlled means and said arm being controllable so as to move said projecting members deep into the cargo space under the roof at any number of different locations along the side of the body, through an opening therein, for lifting cargo therefrom and carrying it out and depositing it adjacent to the truck;
and whereas said extendable portion and said depending means may be swung from one oppositely directed side of said body to the other oppositely directed side about a transverse end of said body, without the need to remove or raise said depending means, so it may serve to unload from either side of the truck body.