CA1119561A - Truck bodies, and trucks incorporating the same - Google Patents
Truck bodies, and trucks incorporating the sameInfo
- Publication number
- CA1119561A CA1119561A CA000308701A CA308701A CA1119561A CA 1119561 A CA1119561 A CA 1119561A CA 000308701 A CA000308701 A CA 000308701A CA 308701 A CA308701 A CA 308701A CA 1119561 A CA1119561 A CA 1119561A
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- truck body
- discharge
- discharge plate
- truck
- fore
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Abstract
ABSTRACT OF THE DISCLOSURE
In order to avoid the requirement tiltably to raise a truck body for discharge of material therefrom where the truck body is a dump truck body, a sander or spreader truck body, or a dual purpose truck body which can serve alternatively as a dump truck body or as a sander or spreader truck body there is provided in a truck body an upstanding discharge plate which extends between side walls of the truck body and is movable by a power operated drive which comprises forward and rearward block and tackle systems in a fore and aft direction between the front wall and the rear wall of the truck body. Material may thus be discharge from the truck body by the discharge plate at the rear of the truck body when it is desired that the truck body operate as a dump truck body and at the front of the truck body when it is desired that the truck body operate as a sander or spreader truck body.
In order to avoid the requirement tiltably to raise a truck body for discharge of material therefrom where the truck body is a dump truck body, a sander or spreader truck body, or a dual purpose truck body which can serve alternatively as a dump truck body or as a sander or spreader truck body there is provided in a truck body an upstanding discharge plate which extends between side walls of the truck body and is movable by a power operated drive which comprises forward and rearward block and tackle systems in a fore and aft direction between the front wall and the rear wall of the truck body. Material may thus be discharge from the truck body by the discharge plate at the rear of the truck body when it is desired that the truck body operate as a dump truck body and at the front of the truck body when it is desired that the truck body operate as a sander or spreader truck body.
Description
~119S61 Truck bodies, and trucks incorporating the same This invention is concerned with improvements in or relating to truck bodies, and with trucks incorporating the same. It is known to provide, in a truck body comprising a floor bounded by upstanding front, rear and side walls, discharge means which is positioned at or adjacent to the rear wall, or which is positioned at or adjacent to the front wall.
Where the discharge means is positioned at or adjacent to the rear wall the truck body usually constitutes a dump truck body, the upper corner portions of the rear wall generally being pivotally connected to the adjacent side walls whereby the rear wall may pivot away from the side walls to provide said discharge means for discharging, for example, earth or gravel from the truck body. Where the discharge means is positioned at or adjacent to the front wall the truck body usually constitutes a sander or spreader truck body, a rotatably driven spinner generally being mounted below the discharge means for spreading, for example, sand or salt which is discharged through the disGharge means on to the spinner across the highway or the like being travelled by the truck. It is also known to provide a dual purpose truck body which can serve alternatively as a dump truck body or as a sander or spreader truck body, as desired.
In each of these known forms of truck bodies the truck body is operatively tiltably raised about a tilting axis relative to the chassis of the associated truck in order to discharge ~195~1 the material through the discharge means, the tilting axis being disposed in the case of a dump truck body at the rear of the truck body and being disposed in the case of a sander or spreader truck body at the front o~ the truck body. In the case of a dual purpose truck body the tilting axis is disposed selectively at the rear of the truck body or at the front of the truck body depending on whether the truck body is to function as a dump truck body or as a sander or spreader truek body, respectively. It is a disadvantage of such hith-erto known forms of truek bodies, and of trucksincorporatingsuch truek bodies, that when the truek body is tilted about the tilting axis the centre of gravity of the truek is sub-stantially raised with a resultant reduction in the stability of the truek. This disadvantage is particularly significant in the ease of dump trucks operating on construction sites since on sueh sites the supporting ground level is generally extremely uneven and the reduetion in the stability of the trucks can result in toppling over of ~he trucks. It is a further disadvantage of the above-described hitherto known forms of truek bodies, and of trucks incorporating such truek bodies, that with the truck bodies operatively tilted as described above the wind resistance to movement of the trucks is substantially inereased. This further disadvantage is generally more significant in relation to sander or spreader trucks which during the discharge of the material from the assoeiated truek bodies are usually travelling along a highway or the like, than in relation to dump trueks which during discharge or the material from the associated truek bodies are usually stationary or travelling only at a low speed.
A still further disadvantage of the above-described hitherto known forms of truck bodies, and of trueks ineorporating sueh truek bodies, is that it is of eourse neeessary to provide an appropriate power meehanism for operatively raising the truek body during tilting thereof, this mechanism being relatively expensive since it must be sufficiently ~1195ti1 .
robust and powerful to raise the fully loaded truck body during tilting thereof.
.
It is a primary object of the present invention to pro~ide -an improved truck body in which the above-described dis-advantages are substantially obviated or mitigated.
A truck body according to the present invention comprises a floor bounded by upstanding front, rear, and side walls, discharge means provided at or adjacent to at least one of the walls constituted by the front and rear walls for discharge therethrough of material from the body, and anupstanding discharge plate extending between the side walls ar~ movable in a fore and aft direction between the ~ront wall and the rear ~all, arld.drive means connected ta ths discharge plate for operative movement thereof ;n said fore and aft direction, the drive means comprising forward and rearward block and tackle systems each of which comprises at least one pulley journalled on said truck body and at least one mo~abIe pulley, each block and tackle system also having at least one flexible, non-extendihle element,.
one end of which is secured to the truck bod~ then trained over said one and said movable pulleys and secured at its .
other end to said discharge plate, said block and tackle systems being arranged to move said discharge plate in respectively opposite directions in response to m~vement of said movable pulleys in the same direction, and a common piston and cylinder assembly arranged simultaneously to move said mGvable pulleys in a selected direction.
It is also an object of the present invention to provide a truck incorporating a truck body according to the present invention.
In order that the invention may be more clearly understood and more readily carried into ef~ect the same will now, by way of example, be more fully described with refererlce to ~1195~
the accompanying drawings in which Fig. 1 is a diagrammatic view of a truck according to the present invention, the truck being shown in operatlon as a dump truck;
Fig. 2 is a further diagramatic ~iew o~ a truck according to the present invention, but with the truck being shown in operation as a sander or spreader truck;
Fig. 3 is a partially broken away view of a truck body according to a preferred embodiment of the invention;
and Figs. 4 and 5 are views on enlarged scales of portions of the ~ruck body shown ln Fig. 3.
Referring to the drawings and in particular to Figs 1 and
Where the discharge means is positioned at or adjacent to the rear wall the truck body usually constitutes a dump truck body, the upper corner portions of the rear wall generally being pivotally connected to the adjacent side walls whereby the rear wall may pivot away from the side walls to provide said discharge means for discharging, for example, earth or gravel from the truck body. Where the discharge means is positioned at or adjacent to the front wall the truck body usually constitutes a sander or spreader truck body, a rotatably driven spinner generally being mounted below the discharge means for spreading, for example, sand or salt which is discharged through the disGharge means on to the spinner across the highway or the like being travelled by the truck. It is also known to provide a dual purpose truck body which can serve alternatively as a dump truck body or as a sander or spreader truck body, as desired.
In each of these known forms of truck bodies the truck body is operatively tiltably raised about a tilting axis relative to the chassis of the associated truck in order to discharge ~195~1 the material through the discharge means, the tilting axis being disposed in the case of a dump truck body at the rear of the truck body and being disposed in the case of a sander or spreader truck body at the front o~ the truck body. In the case of a dual purpose truck body the tilting axis is disposed selectively at the rear of the truck body or at the front of the truck body depending on whether the truck body is to function as a dump truck body or as a sander or spreader truek body, respectively. It is a disadvantage of such hith-erto known forms of truek bodies, and of trucksincorporatingsuch truek bodies, that when the truek body is tilted about the tilting axis the centre of gravity of the truek is sub-stantially raised with a resultant reduction in the stability of the truek. This disadvantage is particularly significant in the ease of dump trucks operating on construction sites since on sueh sites the supporting ground level is generally extremely uneven and the reduetion in the stability of the trucks can result in toppling over of ~he trucks. It is a further disadvantage of the above-described hitherto known forms of truek bodies, and of trucks incorporating such truek bodies, that with the truck bodies operatively tilted as described above the wind resistance to movement of the trucks is substantially inereased. This further disadvantage is generally more significant in relation to sander or spreader trucks which during the discharge of the material from the assoeiated truek bodies are usually travelling along a highway or the like, than in relation to dump trueks which during discharge or the material from the associated truek bodies are usually stationary or travelling only at a low speed.
A still further disadvantage of the above-described hitherto known forms of truck bodies, and of trueks ineorporating sueh truek bodies, is that it is of eourse neeessary to provide an appropriate power meehanism for operatively raising the truek body during tilting thereof, this mechanism being relatively expensive since it must be sufficiently ~1195ti1 .
robust and powerful to raise the fully loaded truck body during tilting thereof.
.
It is a primary object of the present invention to pro~ide -an improved truck body in which the above-described dis-advantages are substantially obviated or mitigated.
A truck body according to the present invention comprises a floor bounded by upstanding front, rear, and side walls, discharge means provided at or adjacent to at least one of the walls constituted by the front and rear walls for discharge therethrough of material from the body, and anupstanding discharge plate extending between the side walls ar~ movable in a fore and aft direction between the ~ront wall and the rear ~all, arld.drive means connected ta ths discharge plate for operative movement thereof ;n said fore and aft direction, the drive means comprising forward and rearward block and tackle systems each of which comprises at least one pulley journalled on said truck body and at least one mo~abIe pulley, each block and tackle system also having at least one flexible, non-extendihle element,.
one end of which is secured to the truck bod~ then trained over said one and said movable pulleys and secured at its .
other end to said discharge plate, said block and tackle systems being arranged to move said discharge plate in respectively opposite directions in response to m~vement of said movable pulleys in the same direction, and a common piston and cylinder assembly arranged simultaneously to move said mGvable pulleys in a selected direction.
It is also an object of the present invention to provide a truck incorporating a truck body according to the present invention.
In order that the invention may be more clearly understood and more readily carried into ef~ect the same will now, by way of example, be more fully described with refererlce to ~1195~
the accompanying drawings in which Fig. 1 is a diagrammatic view of a truck according to the present invention, the truck being shown in operatlon as a dump truck;
Fig. 2 is a further diagramatic ~iew o~ a truck according to the present invention, but with the truck being shown in operation as a sander or spreader truck;
Fig. 3 is a partially broken away view of a truck body according to a preferred embodiment of the invention;
and Figs. 4 and 5 are views on enlarged scales of portions of the ~ruck body shown ln Fig. 3.
Referring to the drawings and in particular to Figs 1 and
2 thereof, 10 denotes generally a truck which incorporates a non-tiltably mounted truck b~dy 11, the truck body 11 comprising a floor (which is not visible in Fig. 1 and 2 but which is denoted by the reference 12 in Fig. 3), with the floor being bounded by upstanding front, rear and side walls 13, 14 and 15, respectively. Discharge means is provided at or adjacent to the rear wall 14, the upper corner portions of this rear wall 14 being pivotally mounted to the adjacent side walls 15 so that the rear wall 14 may be pivotally moved as shown in Fig. 1 thereby to provide said discharge means through which material 16 may be discharged from the truck body 11 as shown in Fig. 1 when the truck body 11 is operating as a dump truck body. As is shown in Fig. 3, the rear wall 14 presents lugs 17 which are pivotally mounted on pivot pins 18 presented by the adjacent side walls 15, thereby to provide said pivotal mounting of the rear wall 14 relative to the adjaccnt side walls 15. As is shown in in Fig. 2 the truck body 11 is also provided with discharge means disposed at or adjacent to the front wall 13, this latter discharge means comprising a closable opening 19 in the floor 12, and a spinner 20 which is disposed below the opening 19 and which is operatively rotatably driven by power D
~9Si61 means (not shown~, a chute 21 being mounted for directing material 16 which is discharged from the truck body 11 through the opening 19 onto the spinner 20, and an opera-tively power driven conveyor belt 22 being disposed trans-versely within the truck body 11 adjacent to the front wall13 with the upper run of the conveyor belt 22 being sub-stantially flush with and constituting a portion of the floor 12, thereby operatively to transfer material 16 within the truck body 11 adjacent to the front wall 13 to the opening 1~. For clarity, the discharge means comprising the conveyor belt 22, the opening 19, the chute 21 and the spinner 20 has ~een omîtted from Fig. 3.
-~ounted within the truck body 11 is an upstand;ng discharge plate 23 which extends between the side walls 15 and which is movable, by operation of drive means, in the fore and aft direction denoted by the arrows A-A in Figs. 1 and 2 between the front wall 13 and the rear wall 14.
With particular reference to Figs. 3, 4 and 5, the drive means for the discharge plate 23 comprises a forward block and tackle system and a rearward block and tackle system The rearward block and tackle system comprises flexible elements, such as cables 64' and 64", one end 65' of the cable 64' being secured to a bar 66' which is mounted between two lugs 67' secured to - the truck body 11, preferably by being secured to the under-structure of the truck body 11 on which the truck body 11 is fixedly mounted. The cable 64' extends from said one end 65' thereof and is entrained around freely rotatable pulleys 68' and 69' with the end of the cable 64' remote from the end 65' thereof being secured to the discharge plate 23 which is of hollow form. This end of the cable 64' remote from the end 65' thereof is preferably connected to a screw-threaded member 70' on which is threadedly mounted a nut-like member 71' which is retained within the hollow discharge plate 23 but which is rotatable in order to adjust the effective length of the cable 64', for example, to take up slack resulting from any stretching of the cable 64'.
~$~95~1 The pulleys 68' and 69' are disposed beneath the floor 12 of : the truck body 11, with the cable 64' likewise being disposed below the floor 12 except for the run of the cable 64l adjacent to the end thereof remote from the end 65', which i5 disposed within a groove 72 formed in the upper face of the floor 12 adjacent to the appropriate side wall 15, this run of cable 64' which is disposed around a guide block 73' mounted in the discharge plate 23 being disposed through an aperture 74' provided in the end wall of the groove 72, as is 10 more clearly shown in Fig. 4.
The pulleys 68' are mouDted on a shaft 75 which is freely rotatably journalled within transverse tubes 76, while the pulleys 69' are freely rotatably mounted on the understructure of the truck body 11.
The cable 64" is en~rained around freely rotatable pulleys 68"
an2 69" correspondin~ to the pulleys G8' and 69', respec-tively, with one end tnot shown) of the cable 64" being secured to the truck body 11 in the same manner as the end 65' of the cable 64' and the other end of the cable 64"
20~ likewise being adjustably secured to the discharge plate 23 in a manner corresponding to the end of the cable 64', remote from the end 65' thereof. As will be noted from Fig. 3 pulleys 68" are mounted on the end of the shaft 75 remote from the pulleys 68'.
The forward block and tackle system corresponds to the rear-ward block and tackle system as hereinbefore described, the various parts of the forward block and tackle system which are shown being denoted by the same reference numerals as the corresponding parts of the rearward block and tackle system, but with these references numerals for the forward block-and tackle system increased by 100. Thus, for example, the cables 164' and 164" of the forward block and tackle system correspond to the cables 64' and 64", respectively, of the rearward block and tackle system.
5~1 7 -- .
Power means comprising a pair of hydraulically operable piston and cylinder assemblies 77 is mounted beneath the floor 12 of the truck body 11, the piston rods 78 of these piston and cylinder assemblies 77 being connected to the tubes 176 of the forward block and tackle system, and the tubes 76 of the rearward block and tackle system being connected to the tubes 176 of ~he forward b.l.ock and tackle system by plates 79 secured therebetween as, for example, by welding 80 denotes guide rollers which are freely rotatably mounted .: on support lugs 81 presented by portions of the discharge.
plate 23 which extend over the upper edges of the side walls 15, the rollers.80 running in guide channels 82 provided in the outer faces of the side walls 15.
With particular reference to Fig. 5, the ends of the shafts 75, 175 project beyond the outermost pulleys 68', 68" and 168' and 168" and are rotatably mounted in outwardly open, U-shaped guide plates 83 which slidably embrace longitudinal guide beams 84 of the understructure of the truck body 11 extending in the fore and aft direction.
As will be appreciated, movement of the piston rods 78 in the forward direction caused by operation of the piston and cylinder assemblies 77 produces corresponding for~ard move-` ment of the pulleys 68', 68." with resultant rearward movement i~ the fore and aft direction of the discharge plate 23 fromthe front wall 13 towards the rear wall 14 under the influence of the rearward block and tackle system, this rearward movement of the discharge plate 23 being permitted by the forward block and tackle system the pulleys 168', 168'i of which are simultanecusly moved forwardly Conversely, movement of the piston rods 78 in the rearward direction caused by operation of the piston and cylinder assemblies 77 . produces corresponding rearward movement of the pulleys 168', .. . ... . .. ... . . . . ..... . . .. . .. . . .. . ... .. _ -- . .. .. . ,.. .. ~ . . .... .. .
11~9561 168" with resultant forward movement in the fore and aft direction of the discharge plate 23 from the rear wall 14 towards the front wall 13 under the influence of the forward block and tackle system, this forward movement of the dis-charge plate 23 being permitted by the rearward block and . ` tackle system the pulleys 68l, 68" of- which are simultan-eou~ly moved rearwardlyO
It wiIl be appreciated from Fig 3 that the above-described operative movement of the discharge plate 23 is, in the preferred embodiment illustrated, four times greater than - the movement of the piston rods 78 of the piston and cylinder assemblies 77 which causes this ~ovement of the discharge plate 23, although by altering the number of pulleys 68', ~ 68" and 168', 168" the ratio of the operative movement of 15~ the discharge plate 23 to the movement of the piston.rods 78 can be varied as desi.red~ Thus, the piston and cylinder assemblies 77 may have a.relatively short stroke while still ensuring that the discharge plate 23 can be moved in the fore and aft direction the entire distance between the front and rear walls 13 and 14.
Furthermore, in alternative forms (not shown) of this preferred embodiment of the invention the cables 64"
and 164" together with the associated pulleys 68", 69" and 168", 169" may be omitted, in which case the single cable 25 64' together with the associated pulleys 68', 69' of the rearward block and tackle system, and the single cable .164' together with the associated pulleys 168', 169' of the forward block and tackle system are preferably sub-stantially centrally disposed. It will also of course.be appreciated that while as shown in Fig. 3 there are two piston and cylinder assemblies 77 there may in alternative fo,ms (not shown) of this preferred embodiment be only a singleipiston and cylinder assembly 77.
' 1~19561 g As is sho~n in Fig. 3 the lower edge portion of the rear wall of the discharge plate 23 may be constituted by a separate plate 23a which is mounted by, for example, bolts to the remainder of the discharge plate 23, the plate 23a being resiliently urged by, for example, inherent resiliency of the plate 23a against the floor-12 of the truck body 11 thereb~.~ during operation of the truck body 11 as a dump truck body as hereinafter described substantially to prevent the material 16 passing beneath the lower edge of the rear .10 face of the discharge plate 23 with resultant risk of the discharge plate 23 becoming jammed_. ~ -. .
Furthermore, the lower edge portion of the front wall of the discharge plate 23 may be constituted by a plate (.not shown) corresponding tc the plate 23a thereby during operation of the truck body 11 as a sander or spreader truck body as hereinafter described likewise substantially to prevent the material 16 passing beneat~ the lower edge of the front face.
o~ the discharge plate 23 with resultant risk of the discharge plate 23 becoming jammed.
The piston and cylinder assem~.lie.s 77 are of course each operatively connected by pressure fluid lines ~not shown) to a s~urce of pressure. fluid s.uch as a fluid pump which ma~
be driven by the traction engine of the association truck~
When it is desixed to operate the truck body 11 as a dump truck body the discharge. plate 23 is initially positioned, by operation of the associated drive means for the discharge plate 23, adjacent to the front wall 13, and the material 16 to be transported in the truck body 11 is then loaded therein between the discharge plate 23 and the rear wall 14. When it is subsequertly desired to dump this material 16 from the truck body 11 said drive means for the discharge plate 23 is operated to move the discharge plate 23 in th- fore and aft direction from the front wall 13 towards the rear wall 14.
This movement of the discharge plat~ 23 forces the material 16 rearwardly and out of the truck body 11 as the rear wall 14 pivots upwardly about the pivot pins 18.
When, however, it is desired to operate the truck body 11 as a sander or spreader truck body the discharge plate 23 is, as will be appreciated, initi~lly positîoned adjacent to the rear wall 14, and the material 16 to be transported is then loaded into the truck body 11 between the front wall 13`and the discharge plate 23. To discharge the material with the truck body 11 operating as a sander or spreader truck body the opening 19 is uncovered, the conveyor belt 22 and the spinner 20 are actuated, and the discharge plate 23 is moved, by operation of the drive means therefor, in the fore and at direction from the rear wall 14 towards the front wall 13, this movemert of the discharge plate 23 forcing the material 16 towards the front wall 13 where it is conveyed by the conveyor belt 22 to the opening 19 through which the material passes to the chute 21 and thence to the rotating spinner 20 '`or distri-bution over the associated road surface or the like.
While as hereinbefore described with reference to the accompanying drawings the truck body 11 according to the present invention is a dual purpose truck body which can alternatively be used, as desired, as a dump truck b~dy or as a sander or spreader truck body, it will be appreciated that the truck body 11 may serve only as a dump truck body ~5 or may serve only as a sander or spreader truck body.
~9Si61 means (not shown~, a chute 21 being mounted for directing material 16 which is discharged from the truck body 11 through the opening 19 onto the spinner 20, and an opera-tively power driven conveyor belt 22 being disposed trans-versely within the truck body 11 adjacent to the front wall13 with the upper run of the conveyor belt 22 being sub-stantially flush with and constituting a portion of the floor 12, thereby operatively to transfer material 16 within the truck body 11 adjacent to the front wall 13 to the opening 1~. For clarity, the discharge means comprising the conveyor belt 22, the opening 19, the chute 21 and the spinner 20 has ~een omîtted from Fig. 3.
-~ounted within the truck body 11 is an upstand;ng discharge plate 23 which extends between the side walls 15 and which is movable, by operation of drive means, in the fore and aft direction denoted by the arrows A-A in Figs. 1 and 2 between the front wall 13 and the rear wall 14.
With particular reference to Figs. 3, 4 and 5, the drive means for the discharge plate 23 comprises a forward block and tackle system and a rearward block and tackle system The rearward block and tackle system comprises flexible elements, such as cables 64' and 64", one end 65' of the cable 64' being secured to a bar 66' which is mounted between two lugs 67' secured to - the truck body 11, preferably by being secured to the under-structure of the truck body 11 on which the truck body 11 is fixedly mounted. The cable 64' extends from said one end 65' thereof and is entrained around freely rotatable pulleys 68' and 69' with the end of the cable 64' remote from the end 65' thereof being secured to the discharge plate 23 which is of hollow form. This end of the cable 64' remote from the end 65' thereof is preferably connected to a screw-threaded member 70' on which is threadedly mounted a nut-like member 71' which is retained within the hollow discharge plate 23 but which is rotatable in order to adjust the effective length of the cable 64', for example, to take up slack resulting from any stretching of the cable 64'.
~$~95~1 The pulleys 68' and 69' are disposed beneath the floor 12 of : the truck body 11, with the cable 64' likewise being disposed below the floor 12 except for the run of the cable 64l adjacent to the end thereof remote from the end 65', which i5 disposed within a groove 72 formed in the upper face of the floor 12 adjacent to the appropriate side wall 15, this run of cable 64' which is disposed around a guide block 73' mounted in the discharge plate 23 being disposed through an aperture 74' provided in the end wall of the groove 72, as is 10 more clearly shown in Fig. 4.
The pulleys 68' are mouDted on a shaft 75 which is freely rotatably journalled within transverse tubes 76, while the pulleys 69' are freely rotatably mounted on the understructure of the truck body 11.
The cable 64" is en~rained around freely rotatable pulleys 68"
an2 69" correspondin~ to the pulleys G8' and 69', respec-tively, with one end tnot shown) of the cable 64" being secured to the truck body 11 in the same manner as the end 65' of the cable 64' and the other end of the cable 64"
20~ likewise being adjustably secured to the discharge plate 23 in a manner corresponding to the end of the cable 64', remote from the end 65' thereof. As will be noted from Fig. 3 pulleys 68" are mounted on the end of the shaft 75 remote from the pulleys 68'.
The forward block and tackle system corresponds to the rear-ward block and tackle system as hereinbefore described, the various parts of the forward block and tackle system which are shown being denoted by the same reference numerals as the corresponding parts of the rearward block and tackle system, but with these references numerals for the forward block-and tackle system increased by 100. Thus, for example, the cables 164' and 164" of the forward block and tackle system correspond to the cables 64' and 64", respectively, of the rearward block and tackle system.
5~1 7 -- .
Power means comprising a pair of hydraulically operable piston and cylinder assemblies 77 is mounted beneath the floor 12 of the truck body 11, the piston rods 78 of these piston and cylinder assemblies 77 being connected to the tubes 176 of the forward block and tackle system, and the tubes 76 of the rearward block and tackle system being connected to the tubes 176 of ~he forward b.l.ock and tackle system by plates 79 secured therebetween as, for example, by welding 80 denotes guide rollers which are freely rotatably mounted .: on support lugs 81 presented by portions of the discharge.
plate 23 which extend over the upper edges of the side walls 15, the rollers.80 running in guide channels 82 provided in the outer faces of the side walls 15.
With particular reference to Fig. 5, the ends of the shafts 75, 175 project beyond the outermost pulleys 68', 68" and 168' and 168" and are rotatably mounted in outwardly open, U-shaped guide plates 83 which slidably embrace longitudinal guide beams 84 of the understructure of the truck body 11 extending in the fore and aft direction.
As will be appreciated, movement of the piston rods 78 in the forward direction caused by operation of the piston and cylinder assemblies 77 produces corresponding for~ard move-` ment of the pulleys 68', 68." with resultant rearward movement i~ the fore and aft direction of the discharge plate 23 fromthe front wall 13 towards the rear wall 14 under the influence of the rearward block and tackle system, this rearward movement of the discharge plate 23 being permitted by the forward block and tackle system the pulleys 168', 168'i of which are simultanecusly moved forwardly Conversely, movement of the piston rods 78 in the rearward direction caused by operation of the piston and cylinder assemblies 77 . produces corresponding rearward movement of the pulleys 168', .. . ... . .. ... . . . . ..... . . .. . .. . . .. . ... .. _ -- . .. .. . ,.. .. ~ . . .... .. .
11~9561 168" with resultant forward movement in the fore and aft direction of the discharge plate 23 from the rear wall 14 towards the front wall 13 under the influence of the forward block and tackle system, this forward movement of the dis-charge plate 23 being permitted by the rearward block and . ` tackle system the pulleys 68l, 68" of- which are simultan-eou~ly moved rearwardlyO
It wiIl be appreciated from Fig 3 that the above-described operative movement of the discharge plate 23 is, in the preferred embodiment illustrated, four times greater than - the movement of the piston rods 78 of the piston and cylinder assemblies 77 which causes this ~ovement of the discharge plate 23, although by altering the number of pulleys 68', ~ 68" and 168', 168" the ratio of the operative movement of 15~ the discharge plate 23 to the movement of the piston.rods 78 can be varied as desi.red~ Thus, the piston and cylinder assemblies 77 may have a.relatively short stroke while still ensuring that the discharge plate 23 can be moved in the fore and aft direction the entire distance between the front and rear walls 13 and 14.
Furthermore, in alternative forms (not shown) of this preferred embodiment of the invention the cables 64"
and 164" together with the associated pulleys 68", 69" and 168", 169" may be omitted, in which case the single cable 25 64' together with the associated pulleys 68', 69' of the rearward block and tackle system, and the single cable .164' together with the associated pulleys 168', 169' of the forward block and tackle system are preferably sub-stantially centrally disposed. It will also of course.be appreciated that while as shown in Fig. 3 there are two piston and cylinder assemblies 77 there may in alternative fo,ms (not shown) of this preferred embodiment be only a singleipiston and cylinder assembly 77.
' 1~19561 g As is sho~n in Fig. 3 the lower edge portion of the rear wall of the discharge plate 23 may be constituted by a separate plate 23a which is mounted by, for example, bolts to the remainder of the discharge plate 23, the plate 23a being resiliently urged by, for example, inherent resiliency of the plate 23a against the floor-12 of the truck body 11 thereb~.~ during operation of the truck body 11 as a dump truck body as hereinafter described substantially to prevent the material 16 passing beneath the lower edge of the rear .10 face of the discharge plate 23 with resultant risk of the discharge plate 23 becoming jammed_. ~ -. .
Furthermore, the lower edge portion of the front wall of the discharge plate 23 may be constituted by a plate (.not shown) corresponding tc the plate 23a thereby during operation of the truck body 11 as a sander or spreader truck body as hereinafter described likewise substantially to prevent the material 16 passing beneat~ the lower edge of the front face.
o~ the discharge plate 23 with resultant risk of the discharge plate 23 becoming jammed.
The piston and cylinder assem~.lie.s 77 are of course each operatively connected by pressure fluid lines ~not shown) to a s~urce of pressure. fluid s.uch as a fluid pump which ma~
be driven by the traction engine of the association truck~
When it is desixed to operate the truck body 11 as a dump truck body the discharge. plate 23 is initially positioned, by operation of the associated drive means for the discharge plate 23, adjacent to the front wall 13, and the material 16 to be transported in the truck body 11 is then loaded therein between the discharge plate 23 and the rear wall 14. When it is subsequertly desired to dump this material 16 from the truck body 11 said drive means for the discharge plate 23 is operated to move the discharge plate 23 in th- fore and aft direction from the front wall 13 towards the rear wall 14.
This movement of the discharge plat~ 23 forces the material 16 rearwardly and out of the truck body 11 as the rear wall 14 pivots upwardly about the pivot pins 18.
When, however, it is desired to operate the truck body 11 as a sander or spreader truck body the discharge plate 23 is, as will be appreciated, initi~lly positîoned adjacent to the rear wall 14, and the material 16 to be transported is then loaded into the truck body 11 between the front wall 13`and the discharge plate 23. To discharge the material with the truck body 11 operating as a sander or spreader truck body the opening 19 is uncovered, the conveyor belt 22 and the spinner 20 are actuated, and the discharge plate 23 is moved, by operation of the drive means therefor, in the fore and at direction from the rear wall 14 towards the front wall 13, this movemert of the discharge plate 23 forcing the material 16 towards the front wall 13 where it is conveyed by the conveyor belt 22 to the opening 19 through which the material passes to the chute 21 and thence to the rotating spinner 20 '`or distri-bution over the associated road surface or the like.
While as hereinbefore described with reference to the accompanying drawings the truck body 11 according to the present invention is a dual purpose truck body which can alternatively be used, as desired, as a dump truck b~dy or as a sander or spreader truck body, it will be appreciated that the truck body 11 may serve only as a dump truck body ~5 or may serve only as a sander or spreader truck body.
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A truck body comprising a floor bounded by upstanding front, rear and side walls, discharge means provided at or adjacent to at least one of the walls constituted by the front and rear walls for discharge therethrough of material from the body, an upstanding discharge plate extending between the side walls and movable in a fore and aft direction between the front wall and the rear wall, and drive means connected to the discharge plate for operative movement thereof in said fore and aft direction, the drive means comprising forward and rearward block and tackle systems each of which comprises at least one pulley jour-nalled on said truck body and at least one movable pulley, each block and tackle system also having at least one flexible, non-extendible element, one end of which is secured to the truck body then trained over said one and said movable pulleys and secured at its other end to said discharge plate, said block and tackle systems being arranged to move said discharge plate in respectively opposite directions in response to movement of said movable pulleys in the same direction, and a common piston and cylinder assembly arranged simultaneously to move said movable pulleys in a selected direction.
2. A truck body according to claim 1, wherein the truck body constitutes a dual purpose truck body, the discharge means comprising first discharge means positioned at or adjacent to the rear wall for discharge of material therethrough during use of the truck body as a dump truck body, and second dis-charge means positioned at or adjacent to the front wall for discharge of material therethrough during use of the truck body as a sander or spreader truck body.
3. A truck body according to either one of claims 1 and 2, wherein freely rotatable guide rollers are mounted on the discharge plate, guide channels within which the guide rollers are disposed and which textend in said fore and aft direction being provided by the side walls of the truck body.
4. A truck body according to either one of claims 1 and 2, wherein a separate plate is mounted on the discharge plate, said separate plate being resiliently urged against the floor of the truck body.
5. A truck body according to either one of claims 1 and 2, wherein in each of the forward and rearward block and tackle systems the end portion of the flexible element adjacent the end thereof secured to the discharge plate is disposed within a groove which is provided in the upper face of the floor of the truck body and extends in the fore and aft direction, the remainder of the drive means being mounted beneath the floor.
6. A truck incorporating a non-tiltably mounted truck body which comprises a floor bounded by upstanding front, rear and side walls, discharge means provided at or adjacent to at least one of the walls constituted by the front and rear walls for discharge therethrough of material from the body, an upstanding discharge plate extending between the side walls and movable in a fore and aft direction between the front wall and the rear wall, and drive means connected to the discharge plate for operative movement thereof in said fore and aft direction, the drive means comprising forward and rearward block and tackle systems each of which comprises at least one pulley journalled on said truck body and at least one movable pulley, each block and tackle system also having at least one flexible, non-extendible element, one end of which is secured to the truck body then trained over said one and said movable pulleys and secured at its other end to said discharge plate, said block and tackle systems being arranged to move said discharge plate in respectively opposite directions in response to movement of said movable pulleys in the same direction, and a common piston and cylinder assembly arranged simultaneously to move said movable pulleys in a selected direction.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB32624/77 | 1977-08-03 | ||
| GB3262477 | 1977-08-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1119561A true CA1119561A (en) | 1982-03-09 |
Family
ID=10341525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000308701A Expired CA1119561A (en) | 1977-08-03 | 1978-08-03 | Truck bodies, and trucks incorporating the same |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1119561A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113022409A (en) * | 2021-04-16 | 2021-06-25 | 湖南路港建设有限公司 | Carriage for dump truck for digital earth excavation construction |
-
1978
- 1978-08-03 CA CA000308701A patent/CA1119561A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113022409A (en) * | 2021-04-16 | 2021-06-25 | 湖南路港建设有限公司 | Carriage for dump truck for digital earth excavation construction |
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |