WO2001000440A2 - Rolling stabilizer lift attachment with automatic attachment adapter - Google Patents
Rolling stabilizer lift attachment with automatic attachment adapter Download PDFInfo
- Publication number
- WO2001000440A2 WO2001000440A2 PCT/US2000/017183 US0017183W WO0100440A2 WO 2001000440 A2 WO2001000440 A2 WO 2001000440A2 US 0017183 W US0017183 W US 0017183W WO 0100440 A2 WO0100440 A2 WO 0100440A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- engageable member
- attachment
- power unit
- latching mechanism
- lifting
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G99/00—Subject matter not provided for in other groups of this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
- B60G21/005—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces transversally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
- B60G21/007—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces means for adjusting the wheel inclination
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/07513—Details concerning the chassis
- B66F9/07518—Fuel or oil tank arrangements
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/3604—Devices to connect tools to arms, booms or the like
- E02F3/3609—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat
- E02F3/3622—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat with a hook and a locking element acting on a pin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2200/00—Indexing codes relating to suspension types
- B60G2200/30—Rigid axle suspensions
- B60G2200/32—Rigid axle suspensions pivoted
- B60G2200/322—Rigid axle suspensions pivoted with a single pivot point and a straight axle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2200/00—Indexing codes relating to suspension types
- B60G2200/40—Indexing codes relating to the wheels in the suspensions
- B60G2200/445—Self-steered wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/10—Mounting of suspension elements
- B60G2204/14—Mounting of suspension arms
- B60G2204/143—Mounting of suspension arms on the vehicle body or chassis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
- B60G2204/46—Means for locking the suspension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
- B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
- B60G2206/011—Modular constructions
- B60G2206/0114—Independent suspensions on subframes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2300/00—Indexing codes relating to the type of vehicle
- B60G2300/02—Trucks; Load vehicles
- B60G2300/022—Fork lift trucks, Clark
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
- B60G2400/60—Load
- B60G2400/61—Load distribution
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
- B60G2400/60—Load
- B60G2400/63—Location of the center of gravity
Definitions
- the invention relates to the field of lifting attachments for small power units such as skid steer loaders, Dingoes®, small tractors and "four wheeler” ATVs. More particularly it relates to a forklift attachment with rolling stabilizers for skid steer loaders and the like.
- the invention includes an adapter for connecting attachments.
- the invention also relates to an attachment plate and locking mechanism for securing attachments to construction equipment such as a skid steer loader.
- skid steer loaders are used in the construction, maintenance, and grounds upkeep industries. These include skid steer loaders, light tractors, garden tractors, "four wheeler” all terrain vehicles, and many other compact power units. Skid steer loaders, in particular, are widely employed for a variety of material handling, earth moving and transportation tasks.
- these devices are favored for their compact size, maneuverability and ability to utilize many attachments to accomplish a variety of jobs.
- their high maneuverability is a consequence of their short wheelbase and overall length.
- Counterweights may be used at the opposite end of the power unit from load lifting attachments to balance the vehicle. In order to balance a massive load, a long moment arm or a heavy counterweight must be used. Consequently, the ability of these units to lift loads is limited by the need to keep the overall length and weight of the power unit relatively small.
- skid steer loaders used in landscaping may be fitted with fork attachments to move pallets supporting rolls of sod or concrete landscaping materials.
- An example of such a device is disclosed in U.S. Patent No. 3,458,069 to Wickberg et al.
- Fully loaded pallets of landscaping or construction materials are commonly heavy enough to exceed the capacity of the machine to lift them with out raising the rear wheels from the ground. This forces the contractor to use only partially loaded pallets; to employ other machinery at significant expense; or to redistribute at least some of the materials by hand labor. All of these options are inefficient and costly.
- compact power units are used to move lifted loads to a variety of locations over many types of terrain.
- loads are often moved over unpaved surfaces, up, down and across slopes and over generally uneven ground.
- loads In order to maintain stability of the vehicles as they currently exist, loads must be kept low and close to the center of gravity of the vehicle.
- Tall, heavy loads in combination with a slope or uneven ground can cause compact vehicles to be dangerously unstable or even to overturn.
- Multiple attachments are interchangeable by virtue of a universal mounting plate on each attachment that is securable to an attachment plate on the lift arms of any given loader.
- Currently available attachment plates engage the attachment mounting plate by placing a beveled upper edge beneath a downward-angled flange on the mounting plate. Once the beveled edge is engaged under the downward-angled flange, a latching mechanism is secured to releasably attach the mounting plate to the attachment plate.
- the latching mechanisms of currently available attachment plates are manually operated, and in general, engage a series of sliding bolts or pins on the attachment plate into a mating series of holes on the mounting plate.
- This situation creates a safety risk for the operator or helper, in that they must enter the operational area of the equipment while engaging the latching mechanism.
- the pins or bolts employed in these latching mechanisms are large and heavy in order to bear the substantial load stresses involved in operating the attachment. Additionally, precise alignment of the attachment plate and the mounting plate is required in order to engage the pins or bolts into their mating holes.
- attachment plate releasable without the need to employ a helper or for the operator to shut down and exit the machinery in order to release the attachment from the attachment plate of the loader. Further a self cleaning latching mechanism would be very helpful.
- the present invention increases the lifting capacity of the power unit it is attached to dramatically beyond that of the power unit alone. It makes practical the safe, stable transport of heavy loads over uneven terrain that cannot be accomplished by the power unit alone. In addition, the invention allows lifting to a greater height than the loader alone is capable of.
- the invention includes an automatic attachment adapter which provides for safe, solo operation in the connection and removal of attachments from a skid steer loader or the like.
- the automatic attachment adapter employs a compact, lightweight, high strength latching device to make connection between the attachment plate of the loader and mounting plate of the attachment. Further, the latching device is self-centering, requiring only approximate alignment to operate. In addition, there is no need to enter the operational area of the equipment for manual engagement or disengagement of the latching mechanism, which creates a safer, more efficient, and more economical work environment.
- the present invention is a rolling stabilizer lift attachment that is designed to be manufactured as a product family. Different size ranges of the invention may be manufactured to fulfill different user requirements, the needs of different industries and different pricing categories.
- the rolling stabilizer lift is adjustable to varying working conditions, providing maximum load stability when desired and offering a compact configuration for operating in restricted spaces.
- the lift attachment comprises five major components: a mounting plate including an automatic attachment system, a lifting mast, a right rolling stabilizer, a left rolling stabilizer, and lifting forks or other load engaging apparatus.
- the rolling stabilizer lift may be adapted to attach to a large variety of power units so long as the power unit is sufficiently powerful to move the intended load.
- the mounting plate may be adapted to accommodate coupling to many different types of power equipment.
- the mounting plate may be attached to the rest of the assembly by a freely rotating lateral pivot, in order to allow the rolling stabilizers to remain in full contact with the ground despite irregularity of the terrain.
- the rotation of the pivot may be limited to prevent the rolling stabilizer load from overturning if the ground is dramatically irregular and to allow the attachment to be raised from the ground safely. Additionally, the rotation of the pivot may be restricted from free rotation by a braking mechanism.
- the automatic attachment system employs a mounting plate on the attachment which has at its upper edge a downward-angled flange. Near the lower edge, it employs at least one pin to which the latching mechanism of the mating attachment plate engages.
- the attachment plate on the lift arms of the loader includes an angled upper edge for engaging the angled flange of the mounting plate and at least one latching mechanism which engages the pin on the mounting plate of the attachment.
- the latching mechanism comprises a body housing and two rotating clevises which rotate on posts within the body housing.
- Each rotating clevis has a mouth, defined by an inner jaw and an outer jaw.
- the rotating clevises are able to be fully opened or to engage in one of two locking positions when closing. When open, the mouths of the paired rotating clevises overlap providing a relatively wide receiving area for receiving a mating pin for engagement. Once the engaging pin is in the receiving area, the rotating motion of the paired rotating clevises tends to force the pin to a centered location, creating a self-centering latch mechanism.
- the rotating clevises tend to close with relation to each other, achieving a first locked position, at which point the pin cannot be disengaged without unlocking the rotating clevises. Further travel inward reaches a second locked position, at which the mouths of the rotating clevises are fully meshed and the pin is engaged with great strength.
- This intermeshing of the rotating connectors creates a high- strength attachment between the attachment plate of the loader lift arms and the mounting plate on the attachment.
- the latching mechanism can be remotely disengaged.
- the latching mechanism is well adapted to be disengaged by any of a variety of remote operating mechanisms. These mechanisms include a simple cable release, pneumatic mechanisms, hydraulic mechanisms, and electric servo-motor or solenoid mechanisms.
- the latch mechanism is self cleaning.
- the rotating clevises are biased to an open position by springs or other biasing means. The opening motion of the latching mechanism tends to push debris out of the housing thus clearing it out of the mouths of the rotating clevises.
- the right and left rolling stabilizers or outriggers each comprise a width adjustable support and a swiveling, caster mounted support wheel and tire.
- the rolling stabilizers are similar aside from being opposite handed.
- the rolling stabilizers place the load bearing caster wheels somewhat ahead of and to the sides of the lifting mast.
- the lifting mast is generally centered between the rolling stabilizers and provides a means for lifting loads.
- the lifting mast may lift the load via lifting forks however, bale spears, buckets and other load engaging devices may also be utilized.
- the lifting mast will be actuated hydraulically although other actuation approaches may be used.
- the power unit connected to the rolling stabilizer lift has a hydraulic power supply, it may be used to operate the lifting mast or a self contained power supply unit may be incorporated on the lift attachment itself. It is preferred that the lifting mast be configured to lift to a height of at least eight feet.
- the safety device comprises a manifold combining a pilot operated check valve with a pressure relief valve.
- the resulting integrated valve system requires hydraulic pressure to be maintained in the circuit to actuate lift cylinder lowering. If hydraulic pressure is lost, the pilot operated check valve closes holding the lift cylinder in its then current position.
- the manifold reduces the need for plumbing between individual hydraulic components.
- the rolling stabilizer lift attachment is attached to a power unit via the mounting plate. The width of separation of the stabilizers may be adjusted as appropriate for the job at hand.
- the power unit may be driven as usual allowing for the added space requirements of the lift attachment. Power units that have independent lift modules may lift the attachment off the ground to facilitate relocation of the rolling stabilizer lift when the unit is not loaded, for example, to place the rolling stabilizer lift on a truck or trailer for transport.
- Fig. 1 is a right rear perspective view of a rolling stabilizer lift in accordance with the present invention
- Fig. 2 is a right front perspective view of the rolling stabilizer lift
- Fig. 3 is an exploded right rear perspective view of the rolling stabilizer lift
- Fig. 4 is a cross sectional schematic view of a hydraulic manifold for use with the rollmg stabilizer lift depicting fluid passageways therein;
- Fig. 5 is an elevational view of a gravity biased engagement hook for use with the rolling stabilizer lift;
- Fig. 6 is a schematic view of the hydraulic circuitry of the rolling stabilizer lift
- Figs. 7a and 7b are schematic representations of forces acting on the rolling stabilizer lift and power unit;
- Fig. 8 is a graph depicting the summation of forces and design range of the rolling stabilizer lift;
- Fig. 9 is a graph depicting the summation of forces and design range of the rolling stabilizer lift for a specific example.
- Fig. 10a is a side elevational view of an attachment plate of a loader beginning to engage the mounting plate of an attachment in accordance with the present invention;
- Fig. 10b is a side elevational view of the attachment plate and mounting plate fully engaged
- Fig. 11 a is a top plan view of a latching mechanism in the open position with the cover removed as used with the present invention, springs are not shown for clarity;
- Fig. 1 lb is similar to Fig. 2a but with the latching mechanism in the first locked position;
- Fig. 1 lc is a top plan view of a latching mechanism in the second locked position with the cover in place;
- Fig. 12. is a perspective view of a latching mechanism in the second locked position
- Fig. 13 is a top plan view of an alternate embodiment of a latching mechanism in the second locked position with the cover removed.
- the rolling stabilizer lift attachment 10 comprises five major components: a mounting plate 12, a lifting mast 14, a right rolling stabilizer 16, a left rolling stabilizer 18, and a load engaging apparatus 20. While lifting forks 21 are depicted and described herein, it will be appreciated that many other types of load engaging apparatus 20 may be employed such as bale spears, buckets or grapples, without departing from the spirit and scope of the invention.
- the mounting plate 12 may be pivotably attached to the lifting mast 14 via a freely pivoting shaft 22.
- the shaft is preferably secured into a bushing 24 with a split clamp collar 26 though other securing devices may be used.
- the pivot 22 may be restrained from perfectly free rotation by a frictional or spring-loaded brake 28 (not shown). Fixed or adjustable stops 30 may be employed. In some applications a non-pivoting or rigid mounting may be preferred.
- the mounting plate 12 may be adapted to removably attach to a large variety of power units so long as the power unit is sufficiently powerful to move the intended load.
- Power units may include skid steer loaders, Dingoes®, tractors, garden tractors, "four wheeler” ATVs and others.
- Dingoes® are small wheeled or tracked skid steer power units manufactured by The Toro Company, 8111 Lyndale Avenue South, Bloomington, MN 55420. They are unlike other skid steer loaders in that the operator stands on a platform behind the unit rather than riding on or in it.
- the power unit will often be referred to as a skid steer loader. This should not be considered as limiting.
- an automatic attachment adapter 210 is adapted for connection to mounting plate 12 secured to the rolling stabilizer lift 10 or other suitable attachment.
- the adapter 210 is carried by attachment plate 216 secured to loader lift arms
- Fig. 10a depicts the mounting plate 12 and attachment plate 216 in a pre-engaged position.
- Fig. 10b depicts them in a fully engaged position.
- Mounting plate 12 comprises a downward angled upper flange 220, at least one engagement pin 222 and a lower flange 226.
- Engagement pin 222 is operably connected to the back side 224 of mounting plate 12 and lower flange 226.
- Attachment plate 216 comprises an angled upper edge 228 adapted to fit beneath upper flange 220, connection pivot axes 230 to loader lift arms 218. At least one automatic latching device 232 is carried by the attachment plate 216. Referring to Figs. 11a, l ib and 1 lc an automatic latching device 232 generally includes: a housing 234, an upper rotating clevis 236, a lower rotating clevis 238, a locking block 240, a locking block release mechanism 242 and springs 244.
- the housing 234 includes a top portion 246 and a bottom portion 248.
- the bottom portion 248 supports spring pivot posts 250, 252 and rotating clevis pivot posts 254.
- the bottom portion 248 also presents an engagement pin receiving bay 256.
- the top portion 246 is generally a mirror image mate to the bottom portion 248, but presents bay 256 along with post receiving apertures 258, 260 and 262 aligned with spring pivot posts 250, 252 and rotating clevis pivot posts 254, respectively.
- the top portion 246 may also include release actuator 264 with release actuator pivot post 266. Release actuator 264 may include remote actuator holes 268.
- Remote actuators may include any mechanism capable of applying a linear force to the release actuator 264 at remote actuator holes 268.
- a remote actuator may also apply a rotational force directly to locking block release mechanism 242.
- Remote actuators (not shown) may include a cable release, pneumatic mechanisms, hydraulic mechanisms, and electric servomotor or solenoid mechanisms. An optional manual release may be included as well.
- Upper rotating clevis 236 and lower rotating clevis 238 are pivotably supported on respective pivot posts 254. Each clevis presents an inner jaw 270 and an outer jaw 272 defining clevis mouths 274.
- the inner jaw 270 and outer jaw 272 of upper rotating clevis 236, are milled on their bottom side 276 so that the jaws 270, 272 are about half of the overall thickness of the upper rotating clevis 236.
- the jaws 270, 272 of lower rotating clevis 238 are milled on their top side 278 to about one half the overall thickness of lower rotating clevis 238.
- Upper rotating clevis 236 and lower rotating clevis 238 each include a first locking notch 280, a second locking notch 282 and a spring receiving surface 284.
- the locking block 240 is pivotably coupled to locking block release 242.
- the locking block release 242 takes the form of a bellcrank 286 pivoting on spring pivot post 252.
- the release 242' takes the form of a ramped slider 288.
- Other types of locking block releases 242 may be employed without departing from the spirit and scope of the invention.
- upper rotating clevis 236 and lower rotating clevis 238 are similar in structure but are oriented so that their upper and lower surfaces are reversed. Each includes a generally flat face 290 and a milled face 292 opposite the flat face 290. The milled face 292 presents a first clearance notch 294, a second clearance notch 296 and a spring clearance cutout 298.
- the inner jaw 270 of each rotating clevis 236, 238 presents an inward bevel 300 preferably of about 30 degrees.
- Locking block 240 has rounded corners 302 adapted to mate with first locking notches 280 and second locking notches 282. locking block 240 also presents boss 304 and pivot aperture 306.
- Bellcrank 286 presents an inner curve 308, an outer rounded corner 310, a locking block post 312, and release actuator notch 314. Release actuator 264 further presents bellcrank finger 316 offset by bevel 318.
- the rolling stabilizer lift unit be light enough to be lifted by the power unit.
- selected parts of the rolling stabilizer lift be constructed of high strength, low alloy steel.
- the lifting mast 14 of the rolling stabilizer lift 10 is generally similar to that used in a conventional forklift, and comprises a supporting outer mast 32, a movable inner mast 34 and a movable carriage 36.
- the lifting mast 14 is preferably pivotably secured to the mounting plate 12 and is scalable to allow use in concert with many different power units.
- a hydraulic cylinder or cylinders 38 provide the lifting force though other means of lifting may be employed.
- the lifting cylinder 38 is secured at one end to the base 40 of the outer mast 32.
- the piston rod 42 is coupled at its distal end to bracket 43.
- Sprockets 44 are rotatably carried by bracket 43 at the upper end thereof.
- a pair of roller chains (not shown) is connected at one end to the base 40 of the outer mast 32 and at the other end at the base of the carriage 36.
- the roller chains (not shown) are positioned so that they travel from the outer mast 32 up and over the sprockets 44 and further down to their connection at the base of the carriage 36.
- the carriage 36 is slidably movable within the inner mast 34 and outer mast 32 supported on rollers 46.
- the lifting mast 14 preferably has a lifting capacity of at least 1500 pounds and a lifting height of at least eight feet. Other characteristics of the lifting mast 14 are similar in structure to characteristics of conventional forklift masts well known to those skilled in the art.
- the attached power unit may provide hydraulic power for the lifting mast 14 if the power unit has an integral hydraulic power supply. In this case, appropriate hydraulic connections are provided. In the absence of hydraulics on the power unit the rolling stabilizer lift 10 may have a hydraulic power pack (not shown) incorporated thereupon.
- the load engaging apparatus 20 may comprise lifting forks 21 which are removably attachable to the carriage 36.
- Forks 21 may be engaged to the carriage 36 so as to be width adjustable to a plurality of positions. Referring to Figs. 2 and 5, forks 21 may be engaged to the carriage 36 with the aid of gravity biased engagement hooks 49. Gravity biased hooks 49 are structured so that when hung from their pivot 51 , gravity tends to force them to an engaged position.
- Other load engaging apparatus 20 that may be carried by the carriage 36 include: a bale spear, a grapple hook, a clam shell bucket, a dump box, a tilt box, a sod roller, a lifting boom and the like.
- the rolling stabilizers or outriggers 16,18 support position adjustable castering wheel assemblies 50 located to the side and in front of the lifting mast 14.
- the rolling stabilizers 16,18 are similar, aside from being opposite handed.
- Each of the rolling stabilizers 16,18 comprises a castering wheel assembly 50, a pivot 52, a support arm 54, a slider 56, a sleeve 58 and a locking device 60.
- the sleeve 58 is a hollow polygonal tube secured to the fixed outer mast 32.
- the slider 56 is of similar cross sectional shape to the sleeve 58 and is slidably positionable within the sleeve 58.
- Locking device 60 preferably comprises lock pin 62 receivable through apertures 64 in sleeve 58 and through a plurality of mating apertures 66 through slider 56.
- the stabilizer arm 54 may be angled down from the horizontal about 10 degrees.
- the stabilizers 16,18 may be linked to be movable simultaneously or unlinked to adjust individually. A pair of rack gears and a pinion (not shown) may link them, for example, to assure symmetrical spacing.
- the stabilizers 16,18 may optionally include a power adjustment mechanism.
- the hydraulic safety valve manifold 68 depicted in Figs. 4 and 6 comprises a manifold block 70, a pilot operating check valve 72 and a pressure reducing valve 74.
- the pilot operated check valve 72 preferably has a 3.0: 1 valve ratio, requiring a pilot pressure of one-third the load pressure at the cylinder to open the valve.
- the pressure reducing valve 72 is preferably a direct acting, spool type pressure reducing/relieving valve with internal pilot.
- the manifold block 70 defines a number of ports and connecting fluid passageways. For convenience up, down, right and left will refer to those directions as depicted in Fig. 4. Beginning at the left side and proceeding clockwise, the down control valve port 76, is defined in the left side of the manifold block.
- the top of the block presents the pilot operated check valve port 78, into which pilot operated check valve 72 may be secured and the down lift cylinder port 80.
- the right side of the block presents the pressure reducing valve port 82, into which pressure reducing valve 74 may be secured.
- the bottom of the manifold block presents the up cylinder valve port 84 and the up lift cylinder port 86.
- First fluid passage 88 interconnects the down control valve port 76 with the pilot operating check valve port 78.
- Second fluid passage 90 connects the pilot operated check valve port 78 with the down lift cylinder port 80.
- Third fluid passage 92 connects the down lift cylinder port 80 with the pressure reducing valve port 82.
- Fourth fluid passage 94 connects the pressure reducing valve port 82 with the up control valve port 84.
- fifth fluid passage 96 connects the up lift cylinder port 86 with the pilot operated check valve port 78.
- the schematic diagram of Fig. 6 depicts the hydraulic circuit 98 of the rolling stabilizer lift 10 which employs the above described manifold block.
- Four way directional control valve 100 controls whether a lifting circuit or a lowering circuit is active. When four way directional control valve 100 is moved to the right the lifting circuit is active. When it is moved to the left the lowering circuit is activated.
- the lifting circuit includes a pressure supply 104, pressure reducing valve 74, pilot operated check valve 72, double acting cylinder 106 and fluid return to tank 108.
- the lowering circuit includes a pressure supply 104, a branch to pilot of check valve 110, double acting cylinder 106, pilot operated check valve 72 and fluid return to tank 108.
- Design factors relating to the rolling stabilizer lift include the relationship between the weight of the power unit, the weight of the rolling stabilizer lift with load, and the positioning of the load bearing wheels.
- the supporting wheels In order to increase the lifting capacity of the power unit, the supporting wheels must be placed appropriately. If the support wheels are placed too near the power unit, too little of the weight of the lift and the load are supported by the arm and wheel assembly, and the load tends to lift the rear wheels of the power unit from the ground, leading to tipping of the power unit. If the wheels are placed too far forward, the weight of the rolling stabilizer lift and load are shifted to the power unit. This negates the benefit of the invention by reducing the load carrying capacity. In addition, moving the supporting wheels farther forward increases the resistance of the lift unit to turning by the power unit.
- FIG. 7 The schematic diagrams of Figs. 7a and 7b depict the power unit and the stabilizer lift.
- the effect of gravity acting upon the power unit creates a force annotated in the drawings as F] .
- Gravity acts upon the lift unit and load creating a force annotated as F 2 .
- Forces Fi and F 2 act in opposite directions about a pivot located at the front axle of the power unit.
- the distance from the pivot point to the center of mass of the power unit is labeled d (xi).
- the distance from the pivot point to the support wheels is labeled d (x 2 ).
- the total resistive torque created by friction resisting the turning movement of the assembly labeled M x0 is determined by the equation:
- N F ⁇ Tipping load
- F tj represents the load that may be carried by the lifting mast before the load exceeds the counterbalance of the mobile power unit and tips the combination of the power unit and rolling stabilizer lift.
- the tipping load increases as the length of the rolling stabilizer load is lengthened.
- the graph depicted in Fig. 9 shows the relationship for a specific example of a 1500 pound Dingo® and a 3250 pound capacity rolling stabilizer lift.
- the data points used to create the graph are included in Table 1.
- the design range is limited to the portion of the summation curve where the slope is substantially zero.
- the optimum arm length is found where the slope equals zero.
- the optimum arm length is eighteen inches.
- the exact curve will vary depending upon the design weight of the power unit, the relative position of the power unit and the lift assembly, and the design lift capacity. The design strategy remains the same and can be used to create a family of products.
- the rolling stabilizer lift 10 is connected to a mobile base power unit. If the power unit is equipped with lift arms and a hydraulic system, such as a skid steer loader, appropriate connections are made.
- a hydraulic system such as a skid steer loader
- the angled upper edge 228 of attachment plate 216 is engaged below upper flange 220 of mounting plate 12.
- the lift arms 218, as depicted in Fig. lb it is noted that the normal lifting action tends to cause the lower portion of mounting plate 12 to approach lower portion of attachment plate 216 and to force engagement pin 222 toward mouths 274 of rotating clevises 236, 238 of automatic latching mechanism 232.
- Fig. 10a the angled upper edge 228 of attachment plate 216 is engaged below upper flange 220 of mounting plate 12.
- the normal lifting action tends to cause the lower portion of mounting plate 12 to approach lower portion of attachment plate 216 and to force engagement pin 222 toward mouths 274 of rotating clevises 236, 238 of automatic latching mechanism 232.
- Fig. 1 lb depicts a first locked position of the automatic latching mechanism 222.
- the outer jaws 272 of upper and lower rotating clevises 236, 238 are closed with relation to housing 234 and engagement pin 222 is prevented from exiting their mouths 274.
- the opening receiving dimension R of overlapped clevis mouths 274 is at least twice as large as the diameter D of engagement pin 222.
- receiving dimension R is about three times as large as engagement pin diameter D.
- locking block 240 engages into first locking notches 280 toward which it is biased by springs 244, and prevents rotating clevises 236, 238 from rotating outward until it is removed.
- This position serves as a safety feature holding the attachment plate 216 and mounting plate 12 together, if they are prevented, by an obstruction, from reaching a second locked position as depicted in Fig. l ie.
- the rotating clevises will achieve the second locked position.
- locking block 240 engages second locking notches 282 and the outer jaws 272 and inner jaws 270 of rotating clevises 236, 238 are fully interlocked.
- Engagement pin 222 is securely positioned and cradled within bay 256.
- pin 222 is held with great strength and attachment plate 216 and mounting plate 12 are firmly secured together until locking block 240 is released by the operator.
- the machine operator manipulates a remote actuator (not shown) connected to the release actuator 264 at remote actuator holes 268, which then applies a force to the release actuator 264 causing it to pivot about release actuator pivot post 266.
- Locking block release mechanism 242 is thereby moved, overcoming the bias of springs 244, and disengaging the locking block 240 from first or second locking notches 280, 282.
- Springs 244 then bias upper and lower rotating clevises 236, 238 to rotate outward, thus releasing engagement pin 222.
- Attachment plate 216 and mounting plate 12 may then be separated by manipulation of the loader lift arms 218.
- Locking block 240 may be disengaged by other means without departing from the spirit and scope of the invention.
- the rolling stabilizer lift 10 In lifting loads, the rolling stabilizer lift 10 is operated in a fashion generally similar to a forklift, with some differences.
- the rolling stabilizers 16,18 may be adjusted to a greater width for maximum stability or may be narrowed for narrower loads or to pass through a confined area such as a doorway. This is accomplished by releasing the locking device 60, sliding the stabilizers 16,18 to position and re-engaging the locking device 60.
- the pivotably connected attachment plate 12 maintains ground engagement of the castering wheel assembly 50 to support and stabilize the load.
- one of the rotation stops 30 impinges upon the sleeve 58 to prevent the rolling stabilizer lift 10 from rotating so far as to topple the load to the side. For example if one of the castering wheel assemblies 50 drops into a hole the rotation stop 30 will prevent it from dropping to a point that would tip the load. Once a load is lifted it may be pitched backward toward the power unit 102 for additional stability by pitching the lift arms 112 of the power unit 102, if so equipped.
- Two hydraulic circuit paths are employed, one for lifting loads and the other for lowering them.
- four way direction control valve 100 is moved to the right. Hydraulic fluid from pressure 104 flows through the up control valve port 84 to pressure reducing valve 74. If the pressure exceeds the preset value excess fluid is bled off through down lift cylinder port 80, through down control valve port 76 and returns to tank
- pilot operated check valve 72 closes and the load is held in the lifted position.
- four way direction control valve 100 is moved to the left and fluid flows through down control valve port 76, pressure is applied to pilot operated check valve 72 via branch 110 opening pilot operated check valve 72 allowing load to lower.
- the main fluid flow continues on to double acting cylinder 106, lowering the load.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Transportation (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU63364/00A AU6336400A (en) | 1999-06-25 | 2000-06-22 | Rolling stabilizer lift attachment with automatic attachment adapter |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14107499P | 1999-06-25 | 1999-06-25 | |
US14107599P | 1999-06-25 | 1999-06-25 | |
US60/141,075 | 1999-06-25 | ||
US60/141,074 | 1999-06-25 | ||
US09/598,896 | 2000-06-21 | ||
US09/598,876 US6375405B1 (en) | 1999-06-25 | 2000-06-21 | Automatic attachment adapter |
Publications (3)
Publication Number | Publication Date |
---|---|
WO2001000440A2 true WO2001000440A2 (en) | 2001-01-04 |
WO2001000440A3 WO2001000440A3 (en) | 2001-10-18 |
WO2001000440A9 WO2001000440A9 (en) | 2002-06-06 |
Family
ID=27385595
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/017183 WO2001000440A2 (en) | 1999-06-25 | 2000-06-22 | Rolling stabilizer lift attachment with automatic attachment adapter |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2001000440A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11096330B2 (en) | 2016-10-14 | 2021-08-24 | Hustler Equipment Limited | Retention mechanism for agricultural machinery |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3391905A (en) * | 1966-10-12 | 1968-07-09 | Robert S. Burns | Toilet bowl handling and transporting apparatus |
US3908849A (en) * | 1973-03-28 | 1975-09-30 | Barchard John | Self propelled unloader |
US4826474A (en) * | 1987-12-14 | 1989-05-02 | Butterworth Jetting Systems, Inc. | Forklift apparatus for unloading articles from an elevated surface |
US5018930A (en) * | 1990-03-12 | 1991-05-28 | Sid Corp., Inc. | Lifting and transporting device |
US5387075A (en) * | 1992-02-26 | 1995-02-07 | Aoki; Tuyoshi | Latching mechanism for a front end loading tractor |
US5692325A (en) * | 1996-02-06 | 1997-12-02 | Konan Electric Company Limited | Attachment detaching apparatus for hydraulic shovel |
US5975826A (en) * | 1998-03-17 | 1999-11-02 | Scholder; Perry L. | Hand-truck with attachments |
-
2000
- 2000-06-22 WO PCT/US2000/017183 patent/WO2001000440A2/en active Application Filing
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3391905A (en) * | 1966-10-12 | 1968-07-09 | Robert S. Burns | Toilet bowl handling and transporting apparatus |
US3908849A (en) * | 1973-03-28 | 1975-09-30 | Barchard John | Self propelled unloader |
US4826474A (en) * | 1987-12-14 | 1989-05-02 | Butterworth Jetting Systems, Inc. | Forklift apparatus for unloading articles from an elevated surface |
US5018930A (en) * | 1990-03-12 | 1991-05-28 | Sid Corp., Inc. | Lifting and transporting device |
US5387075A (en) * | 1992-02-26 | 1995-02-07 | Aoki; Tuyoshi | Latching mechanism for a front end loading tractor |
US5692325A (en) * | 1996-02-06 | 1997-12-02 | Konan Electric Company Limited | Attachment detaching apparatus for hydraulic shovel |
US5975826A (en) * | 1998-03-17 | 1999-11-02 | Scholder; Perry L. | Hand-truck with attachments |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11096330B2 (en) | 2016-10-14 | 2021-08-24 | Hustler Equipment Limited | Retention mechanism for agricultural machinery |
Also Published As
Publication number | Publication date |
---|---|
WO2001000440A3 (en) | 2001-10-18 |
WO2001000440A9 (en) | 2002-06-06 |
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