|Publication number||USRE34733 E|
|Application number||US 07/927,055|
|Publication date||Sep 20, 1994|
|Filing date||Aug 5, 1992|
|Priority date||Jan 30, 1990|
|Also published as||US5074622|
|Publication number||07927055, 927055, US RE34733 E, US RE34733E, US-E-RE34733, USRE34733 E, USRE34733E|
|Inventors||Glenn L. Channell|
|Original Assignee||Omaha Standard|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (21), Referenced by (1), Classifications (9), Legal Events (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This invention relates to a lift apparatus and more particularly relates to a novel and improved scissor frame lift apparatus for use in elevating the hinged dump body on a dump truck.
I have previously devised novel and improved scissor frame hoists employed on dump trucks for the purpose of stabilizing the movement of the dump body as it is elevated and tilted rearwardly by a hydraulic cylinder lift mechanism. For example, reference is made to U.S. Pat. Nos. 3,809,429; 4,148,528; and 4,592,593.
For light duty trucks (15,000 lbs. and under gross vehicle weight), the conventional hoist normally used is a drop-hinge scissor hoist in which the scissor hinge of the hoist is dropped down below the top surface of the truck frame and positioned between the truck frame side rails or long members. A typical example of a drop-hinge scissor hoist is the Low Profile LP-090 manufactured by Hydraulics Unlimited Manufacturing Co. of Eaton, Colo. In the LP-090, as well as the other typical drop-hinge scissor hoists, the scissor hinge is the full width of the hoist frame. Inasmuch as the upper and lower scissor frames operate at high stress levels, it is an advantage to have those frames disposed as straight as possible so that forces can be carried directly therethrough without having to "bend the forces around corners."
Very recently, truck chassis manufacturers have been leaving less and less room available between the frame members for the scissor hinge of the hoist. This is due in large amount to the encroachment of exhaust pipes, fuel tanks, brake equalizer valve linkages, and various brackets into the area of the hoist scissor hinge. In some cases, it is impossible to install a conventional drop-hinge scissor hoist because of interference with those components.
It is therefore a principal object of this invention to provide an improved scissor frame lift apparatus for dump trucks.
Yet another object of the invention is to provide a drop-hinge scissor frame lift apparatus for dump trucks wherein the scissor hinge is not "full width" but has a width substantially less than the distance between the truck frame members.
Yet another object of the invention is to provide a scissor frame lift apparatus including a narrow scissor hinge which permits the installation of the same on some trucks which would otherwise be unable to accommodate conventional drop-hinge scissor hoists.
Yet another object of the invention is to provide a scissor frame lift apparatus for dump trucks including a narrow scissor hinge which reduces the amount of time required for mounting the body and hoist on a truck.
Yet another object of the invention is to provide a scissor frame lift apparatus of the type described which reduces the mounting costs thereof.
A further object of the invention is to provide a scissor frame lift apparatus of the type described which permits the hoist to be mounted on different sizes and types of equipment.
Yet another object of the invention is to provide an incorporated body prop which does not load the scissor frame during prop function.
Still another object of the invention is to provide a scissor frame lift apparatus of the type described which is economical of manufacture, durable in use and refined in appearance.
These and other objects of the present invention will be apparent to those skilled in the art.
FIG. 1 is an exploded perspective view of the scissor frame lift apparatus of this invention;
FIG. 2 is a top view of the apparatus;
FIG. 3 is a side elevational view of the apparatus with the phantom lines indicating the upper frame assembly having been moved toward its upper position;
FIG. 4 is a side elevational view illustrating the upper frame assembly pivotally moved to an upper position and held in place by an incorporated body prop;
FIG. 5 is a perspective view illustrating the body prop of this invention;
FIG. 6 is a top view of a typical light duty truck;
FIG. 7 is a side elevational view of the truck of FIG. 6;
FIG. 8 is a side elevational view of the truck of FIG. 7 having the scissor frame lift apparatus of this invention mounted thereon with the broken lines indicating the body pivotally moved to a dumping position;
FIG. 9 is a top view illustrating the scissor frame lift apparatus of this invention mounted on the truck;
FIG. 10 is a sectional view illustrating the relationship of the hoist of this invention and the body and truck frame members; and
FIG. 11 is a rear view of the scissor frame lift apparatus of this invention.
A scissor frame lift apparatus for dump trucks is described which is adapted to be primarily mounted on light duty trucks or the like to enable a hinged dump body to be pivotally moved to a dumping position. The scissor frame lift apparatus is designed to enable the apparatus to be mounted between the frame members of the truck in a manner so as not to interfere with the exhaust pipes, fuel tanks, brake equalizer valve linkages, brackets, etc. The scissor frame lift includes upper and lower frame assemblies which are pivotally secured together at their rearward ends. The lower frame assembly includes a pair of lower frame members which have a lower mount cross tube secured thereto and extending therebetween. The lower mount cross tube has an inner mount cross tube positioned therein with the outer ends thereof being pivotally secured to mounts on the truck frame members. The upper frame assembly includes a pair of upper frame members having an upper mount cross tube secured thereto and extending therebetween at the forward ends thereof. An upper inner mount cross tube is received in the upper mount cross tube and has its opposite ends rotatably secured to mounts secured to the runsills of the dump body. The rearward ends of the frame members of the upper frame assembly are operatively connected to a hinge shaft which is secured to and extends between the rearward ends of the frame members of the lower frame assembly. A hydraulic cylinder is positioned between the frame members of the upper and lower frame assemblies and has its cylinder rod operatively rotatably secured to a cross head shaft which is secured to and which extends between the frame members of the upper frame assembly adjacent the rearward ends thereof. The forward or base end of the hydraulic cylinder is operatively connected to a cylinder mount tube mounted on the lower mount cross tube.
The distance between the rearward ends of the frame members of the lower frame assembly is substantially less than the distance between the frame members of the truck and is substantially less than the distance between the forward ends of the frame members of the lower frame assembly. The distance between the rearward ends of the frame members of the upper frame assembly is substantially less than the distance between the frame members of the truck and is substantially less than the distance between the forward ends of the frame members of the upper frame assembly.
A body prop is also provided and has one end thereof pivotally mounted on the inner lower mount cross tube and which may be moved from a substantially horizontal inoperative position to a substantially upright position wherein the upper end thereof is designed to engage one end of the upper mount cross tube to prevent the upper frame assembly and the dump body from moving downwardly as desired.
The numeral 2 refers to a conventional light duty truck including a pair of longitudinally extending side rails or frame members 4 and 4' adapted to support a body 6 including runsills 8 and 8'.
The drop-hinge scissor frame lift apparatus of this invention is referred to generally by the reference numeral 10 and generally comprises a lower frame assembly 12 and upper frame assembly 14 pivotally secured thereto as will be described in more detail hereinafter. For purposes of description, the apparatus of this invention will be described as including a rearward end 16 and a forward end 18.
Lower frame assembly 12 includes a pair of spaced side frame members 20 and 22 which extend rearwardly and inwardly from their forward ends and which are in the form of C-shaped channels having a top flange TF, bottom flange BF, and web W. As seen in the drawings, the webs W of the frame members 20 and 22 extend inwardly and rearwardly from their forward ends to their rearward ends. It can also be seen that the widths of the flanges TF and BF increase from the forward to rearward ends thereof. The vertical height of the webs increases from the forward to rearward ends also.
The rearward ends of side frame members 20 and 22 have scissor hinge legs 24 and 26 secured thereto which extend downwardly from the rearwardly ends of the webs W at the inner surfaces thereof. Scissor hinge shaft 28 is mounted in and extends between and is secured to scissor hinge sleeves or rings 30 and 32 which are welded to hinge legs 24 and 26 respectively. Lower mount cross tube 34 is welded to the forward ends of side frame members 20 and 22 and has a cylinder mount tube 36 rotatably mounted thereon between the side frame members 20 and 22 as seen in FIG. 1. Cylinder mount tube 36 is maintained in position on the cross tube 34 by means of collars 38 and 40 which are positioned at the opposite ends of the cylinder mount tube 36 and which are welded to the cross tube 34.
Inner cross tube 42 rotatably extends through cross tube 34 and has locator rings 44 and 46 positioned thereon outwardly of the outer ends of cross tube 34 which are welded to the exterior surface of cross tube 42. One end of inner cross tube 42 receives shaft 48 of lower mount 50 which is secured to frame member 4. The other end of inner cross tube 42 receives shaft 48' of lower mount 50' which is secured to frame member 4'. Collars 52 and 52' are mounted on shafts 48 and 48' respectively and are welded thereto at the outer ends thereof. One end of body prop 51 is pivotally mounted on tube 34 outwardly of frame 20 as seen in FIG. 2. Washers 54 and 56 embrace tube 34 on either side of the end of prop 51 and are tack welded to tube 34 to maintain body prop 51 in position.
Upper frame assembly 14 includes a pair of longitudinally extending side frame members 58 and 60 which are in the form of C-shaped channels. Frame member 58 includes a top flange 62, bottom flange 64 and a web 66 extending therebetween. Similarly, frame member 60 includes a top flange 68, bottom flange 70 and web 72. It can be seen that webs 66 and 72 extend inwardly and rearwardly from the forward ends thereof. Additionally, the height of the webs 66 and 72 increases from the forward to rearward ends thereof. Hinge legs 74 and 76 are secured to the rearward ends of frame members 58 and 60 respectively and have a hinge tube 78 mounted therein which extends between the lower rearward ends thereof which is rotatably mounted on the hinge shaft 28. Torque tube 80 is secured to the inside surfaces of the hinge legs 74 and 76 by welding and extends therebetween above hinge shaft 28 as seen in FIG. 3.
Cross head shaft 82 is secured to and extends through and between the hinge legs 74 and 76 and has cross head 84 rotatably mounted thereon as seen in FIG. 1. Rod 86 of cylinder 88 is secured to cross head 84 in conventional fashion by a bolt or pin 90. The forward end of cylinder 88 is secured to cylinder mount base 92 by bolts 94 and 96 as seen in FIG. 1. Cylinder mount base 92 is welded to cylinder mount tube 36 and has mounting gussets 98 and 100 at the opposite ends thereof.
As seen in FIG. 1, body prop holddown 102 extends laterally outwardly from frame member 58 and is positioned above the body prop cradle 104 which extends laterally from frame member 20 of lower frame assembly 12. Body prop 51 is designed to rest in body prop cradle 104 when not being used and will be maintained therein when the truck body is in its lowered condition by the body prop holddown 102. The free end of body prop 51 is provided with a bracket 105 which is adapted to engage the underside of upper mount cross tube 108. As seen in the drawings, cross tube 108 is welded to the forward ends of frame members 58 and 60. Locator rings 110 and 112 embrace the ends of inner cross tube 106 outwardly of cross tube 108 and are tack welded thereto to rotatably maintain or locate tube 106 with respect to tube 108.
Upper mounts 114 and 114' are secured to the runsills 8 and 8' of truck body 6. Mount 114 includes a bracket portion 116 which is secured to run sill 8 and which has shaft 118 extending inwardly therefrom which is rotatably received within the end of tube 106. Similarly, mount 114' is secured to the opposite run sill 8' and has shaft 118' extending inwardly therefrom which is rotatably received in the other end of the cross tube 106.
Body prop 51 may be selectively maintained in its upright condition by means of the prop positioner assembly 120. Assembly 120 includes a pair of spaced-apart upstanding ears or brackets 122 and 124 which are welded to frame member 20 as seen in FIG. 1. Pin 126 extends between the upper inner ends of ears 122 and 124 and has arm 128 rotatably mounted thereon. Arm 128 has a V-shaped notch 130 formed therein as best seen in FIG. 1. Pin 126 is secured to and extends between ears 122 and 124 to maintain ar 128 in the horizontal position of FIG. 1. When body prop 51 is resting in cradle 104, body prop 51 will be positioned below arm 128. When it is desired to position the body prop 51 in its upright position, after the body 6 has been raised, body prop 51 is simply pivotally moved upwardly until arm 128 has been sufficiently pivoted upwardly to enable arm 128 to then fall downwardly to the horizontal position of FIG. 1. Prop 51 is then pivotally moved downwardly until prop 51 engages notch 130 of arm 128 so that prop 51 is maintained in the position of FIG. 4 or 5. The body 6 is then lowered until bracket 105 receives the upper mount cross tube 108. Inasmuch as the upper end of prop 51 engages upper mount cross tube 108 and the lower end of prop 51 is in engagement with tube 34, the weight of the body 6 on prop 51 does not put bending forces on the scissor frame. Thus it can be seen that the novel design of the scissor frame lift apparatus of this invention permits the same to be placed on dump trucks having restricted areas between the frame members thereof. The narrow scissor hinge, by not being "full width", but having a width substantially less than the distance between the truck frame members, permits the apparatus to be mounted on trucks wherein the same would not normally be possible. The fact that the lift apparatus of this invention may be conveniently mounted on modern trucks reduces the amount of time normally required for mounting the body and hoist on such a truck. The lift apparatus of this invention permits the hoist to be mounted on different sizes and types of equipment. Thus it can be seen that the invention accomplishes all of its stated objectives.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US2094521 *||Oct 11, 1935||Sep 28, 1937||Galion Metallic Vault Company||Lifting mechanism for dump bodies|
|US2143291 *||Sep 25, 1936||Jan 10, 1939||Anthony Co||Tipping mechanism|
|US2314531 *||Apr 9, 1942||Mar 23, 1943||Anthony Co||Tipping mechanism|
|US2332961 *||Nov 7, 1941||Oct 26, 1943||Gar Wood Ind Inc||Dump vehicle construction|
|US2588489 *||Jul 19, 1949||Mar 11, 1952||Day Richard F||Tilting apparatus|
|US2635004 *||Dec 14, 1948||Apr 14, 1953||Omaha Standard Inc||Hydraulic hoist mechanism for dump vehicles|
|US2698199 *||Dec 14, 1953||Dec 28, 1954||Godbersen Byron L||Hoist mechanism for dumping vehicles|
|US2731293 *||Jun 18, 1951||Jan 17, 1956||Hutchinson Archibald D L||Dump trucks|
|US2849255 *||Aug 16, 1955||Aug 26, 1958||Pasker Gerald J||Hoist mechanism for dump trucks|
|US3043629 *||Dec 14, 1960||Jul 10, 1962||Lehr Mfg Corp||Truck box tilting mechanism|
|US3784162 *||Aug 6, 1971||Jan 8, 1974||Hydraulics Unltd Mfg Co||Scissor hoist|
|US3791695 *||Jan 7, 1972||Feb 12, 1974||Seniuk S||Vehicle hoist mechanism|
|US3809429 *||Feb 12, 1973||May 7, 1974||Hydraulics Unlimited Mfg Co||Scissor frame assembly|
|US4148523 *||Apr 27, 1977||Apr 10, 1979||Heinrich Wilhelm Dreyer||Folding adjustable work stool|
|US4168861 *||Feb 6, 1978||Sep 25, 1979||Carroll Ollie J||Dump-hoist conversion system|
|US4218094 *||Feb 6, 1978||Aug 19, 1980||The Knapheide Mfg. Co.||Safety brace|
|US4480871 *||Mar 9, 1983||Nov 6, 1984||Fox Eldred A||Dump bed stabilizer|
|US4592593 *||May 4, 1984||Jun 3, 1986||Channell Glenn L||Scissor frame lift apparatus for dump trucks|
|US5048896 *||Apr 20, 1988||Sep 17, 1991||Channell Glenn L||Minimum profile hoist|
|US5074622 *||Jan 30, 1990||Dec 24, 1991||Omaha Standard, Inc.||Scissor frame lift apparatus for dump trucks|
|USRE26455 *||Oct 23, 1963||Sep 10, 1968||Bolster hoist|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US9004842||Oct 10, 2012||Apr 14, 2015||Wastequip, Llc||Hoist apparatus|
|U.S. Classification||298/22.00J, 254/124, 298/17.00B|
|International Classification||B60P1/20, B60P1/16|
|Cooperative Classification||B60P1/16, B60P1/20|
|European Classification||B60P1/20, B60P1/16|