CN111542486A - Leg assembly and vehicle, such as a mobile crane, comprising a leg assembly - Google Patents
Leg assembly and vehicle, such as a mobile crane, comprising a leg assembly Download PDFInfo
- Publication number
- CN111542486A CN111542486A CN201880079603.1A CN201880079603A CN111542486A CN 111542486 A CN111542486 A CN 111542486A CN 201880079603 A CN201880079603 A CN 201880079603A CN 111542486 A CN111542486 A CN 111542486A
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- China
- Prior art keywords
- leg
- leg beam
- frame
- support
- assembly
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/72—Counterweights or supports for balancing lifting couples
- B66C23/78—Supports, e.g. outriggers, for mobile cranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C2700/00—Cranes
- B66C2700/03—Cranes with arms or jibs; Multiple cranes
- B66C2700/0321—Travelling cranes
- B66C2700/0357—Cranes on road or off-road vehicles, on trailers or towed vehicles; Cranes on wheels or crane-trucks
- B66C2700/0378—Construction details related to the travelling, to the supporting of the crane or to the blocking of the axles; Outriggers; Coupling of the travelling mechamism to the crane mechanism
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jib Cranes (AREA)
- Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
- Prostheses (AREA)
Abstract
A leg assembly (10) for supporting a vehicle includes a leg frame (100); a leg beam (200), the leg beam (200) being movable in a horizontal extension direction with respect to the leg frame; and a leg support (300), the leg support (300) coupled to a distal end of the leg beam for supporting the leg assembly on a support surface. In the extended position of the leg beam and the support position of the leg support, a first counter-torque and a second counter-torque act on the leg beam. The first torque is determined by a first vertical force acting upward on a distal end (202) of the leg beam and a second vertical force acting downward on a proximal end (201), wherein a first horizontal distance is between the distal end and the proximal end. The second torque is determined by a first horizontal force acting outwardly on an upper portion of the proximal end of the leg beam and a second horizontal force acting inwardly on a lower portion of the proximal end with a vertical distance between the upper and lower portions.
Description
Technical Field
The present invention relates to a leg assembly comprising a leg frame and a leg beam movable in a horizontally extending direction relative to the leg frame between a retracted position and an extended position. The leg beam is located inside the leg frame in the retracted position and extends from the leg frame in the extended position. In the extended position of the leg beam, the leg beam has a proximal end and a distal end relative to the leg frame. The leg assembly further includes a leg support coupled to a distal end of the leg beam to allow the leg assembly in a support position of the leg support to be supported on a support surface in an extended position of the leg beam. The invention further relates to any vehicle, such as a mobile crane, provided with such a leg assembly with a horizontally extendable leg beam.
Background
Mobile cranes and other vehicles are known having leg assemblies. A leg beam extends from the leg frame and the vehicle, and the leg support is lowered onto the ground at a location where a heavy load is to be handled. The extended leg beam provides greater stability to the mobile crane and can handle higher loads as the width of the extended leg assembly increases. The width of the extended leg assembly is determined by the length of the leg beam, which is limited by the width of the vehicle in which the leg beam is received in its retracted position. Current vehicles with leg assemblies, particularly mobile cranes, have reached the limit of the maximum width that can be achieved to extend the leg assembly. However, a further increased width will increase the stability or the maximum load or load moment (load within a certain radius) that can be handled.
Disclosure of Invention
It is an object of the present invention to provide a leg support having a width that increases for a given width of the leg frame and thus of the vehicle comprising the leg assembly.
It is another or alternative object of the present invention to provide a leg support whose leg beam can be extended to a plurality of positions for supporting a vehicle.
It is a further or alternative object of the present invention to provide a leg assembly that provides an efficient and robust extension of a leg beam.
At least one of the above objects is achieved by a leg assembly for supporting a vehicle on a support surface, the leg assembly comprising:
-a leg frame;
-a leg beam,
the leg beam is movable in a horizontally extending direction relative to the leg frame between a retracted position in which the leg beam is located within the leg frame and an extended position in which the leg beam extends from the leg frame, and
in the extended position of the leg beam, the leg beam has a proximal end and a distal end relative to the leg frame; and
-a leg support coupled to the distal end of the leg beam to allow the leg assembly to be supported on a support surface in a support position of the leg support,
the leg assembly is configured such that in the extended position of the leg beam and the support position of the leg support,
-a first torque acts on the leg beam, the first torque being determined by a first vertical force acting upwards at a first position on the distal end of the leg beam and a second vertical force acting downwards at a second position on the leg beam, the second position being separated from the first position by a first horizontal distance towards the proximal end of the leg beam, the first and second vertical forces acting as a result of the leg beam being supported by the leg support and the frame being supported by the leg beam, respectively, and
-a second torque acts on the leg beam to balance the first torque, the second torque being determined by an interaction between the leg frame and the leg beam, wherein the second torque is at least substantially determined by a first horizontal force acting outwardly with respect to the leg frame at a third position on the leg beam and a second horizontal force acting inwardly with respect to the leg frame at a fourth position on the leg beam, the fourth position being separated from the third position by a first vertical distance in a downward direction.
Having the second torque determined by the horizontal force provides that the leg beam may be further extended from the leg frame to allow the leg assembly to increase in width in the extended position. The (first and second) horizontal forces are to be understood as at least substantially horizontal forces. In addition, there may be a vertical force component, which may be for practical implementation reasons. According to the invention, the second torque is determined or at least substantially determined by a substantially horizontal force. Balancing is to be understood as meaning that the second torque at least substantially counteracts or neutralizes the first torque. Furthermore, the distal and proximal ends are to be understood as distal and proximal end regions and are not limited to only the extreme ends.
In embodiments, the second and third positions are at the proximal end of the leg beam, optionally at the extreme end of the proximal end.
In embodiments, the second and third positions are coincident positions.
In an embodiment, the leg beam is movable in the extension direction to a first semi-extended position between the retracted position and the extended position,
the leg assembly is configured such that in the first semi-extended position of the leg beam and the support position of the leg support,
-a third torque acts on the leg beam, the third torque being determined by a third vertical force acting upwards at the first position on the distal end of the leg beam and a fourth vertical force acting downwards at a fifth position on the leg beam, the fifth position being separated from the first position by a second horizontal distance towards the proximal end of the leg beam being smaller than the first horizontal distance, the third and fourth vertical forces acting as a result of the leg beam being supported by the leg support and the frame being supported by the leg beam, respectively, and
-a fourth torque acts on the leg beam to balance the third torque, the fourth torque being determined by an interaction between the leg frame and the leg beam, wherein the fourth torque is at least substantially determined by a third horizontal force acting outwardly with respect to the leg frame at a sixth position on the leg beam and a fourth horizontal force acting inwardly with respect to the leg frame at a seventh position on the leg beam, the seventh position being separated from the sixth position by a second vertical distance in a downward direction.
This effectively provides an additional position of the leg beam. Likewise, the (third and fourth) horizontal forces are to be understood as at least substantially horizontal forces, and the fourth torque is likewise to be understood as being determined or at least substantially determined by substantially horizontal forces. In addition, there may be a vertical force component, which may be for practical implementation reasons. According to the invention, said fourth torque is mainly determined by a substantially horizontal force. Balancing is to be understood as meaning that the fourth torque at least substantially counteracts or neutralizes the third torque.
In an embodiment, the fifth and sixth positions are coincident positions.
In embodiments, the fourth and seventh positions are coincident positions.
In an embodiment, the leg beam is movable in the extension direction to a second semi-extended position between the retracted position and the extended position,
the leg assembly is configured such that in the second semi-extended position of the leg beam and the support position of the leg support,
-a fifth torque acts on the leg beam, the fifth torque being determined by a fifth vertical force acting upwards at the first position on the distal end of the leg beam and a sixth vertical force acting downwards at an eighth position on the leg beam, the eighth position being separated from the first position by a third horizontal distance towards the proximal end of the leg beam being smaller than the first horizontal distance, the fifth and sixth vertical forces acting as a result of the leg beam being supported by the leg support and the frame being supported by the leg beam, respectively, and
-a sixth torque acts on the leg beam to balance the fifth torque, the sixth torque being determined by the interaction between the leg frame and the leg beam,
wherein the sixth torque is determined by a seventh vertical force acting downward at a ninth location on the leg beam and an eighth vertical force acting upward at a tenth location on the leg beam, the tenth location separated from the ninth location by a fourth horizontal distance toward the proximal end of the leg beam.
This effectively provides another further position of the leg beam.
In embodiments, the second semi-extended position is between the retracted position and the first semi-extended position, and the third horizontal distance is less than the second horizontal distance.
In an embodiment, the leg frame comprises a movable cam movable into a first or second groove corresponding to the second and third or fifth and sixth position, respectively, so as to allow the second vertical force and the first horizontal force or the fourth vertical force and the third horizontal force, respectively, to act on the leg beam in the extended position or the first semi-extended position of the leg beam, respectively, optionally the movable cam is a rotatable cam, optionally the movable cam is operable by a cam actuator, optionally an actuating cylinder, optionally a pneumatic, hydraulic, electric or manually controlled actuating cylinder, optionally the first or second groove is provided in an upper surface of the leg beam, which provides a very fast and secure locking of the leg beam, and the transmission of outward horizontal and downward vertical forces to the leg beam.
In an embodiment, the leg frame comprises a movable cam movable into a first groove corresponding to the second and third positions so as to allow the second vertical and first horizontal forces to act on the leg beam in the extended position of the leg beam and movable into a second groove corresponding to the fifth and sixth positions so as to allow the fourth vertical and third horizontal forces to act on the leg beam in the first half extended position of the leg beam, optionally the movable cam is a rotatable cam, optionally the movable cam is operable by a cam actuator, optionally an actuating cylinder, optionally a pneumatic, hydraulic, electric or manually controlled actuating cylinder, optionally the first and second grooves are provided in an upper surface of the leg beam, this also provides a very quick and secure locking of the leg beam and a transfer of outward horizontal and downward vertical forces to the leg beam.
In an embodiment, the leg assembly comprises a slider element having a first end and a second end, the first end cooperating with the leg beam and the second end cooperating with the leg frame to allow the leg beam to extend from the leg frame and to allow the second horizontal force to act on the leg beam in the extended position of the leg beam, optionally the first end of the slider element is slidably coupled to the leg beam to allow movement of the slider element relative to the leg beam, which provides a secure transfer of horizontal inward forces onto the leg beam.
In an embodiment, the leg frame comprises a first stop, the second end of the slider element is slidable relative to the leg frame when the leg beam extends from the leg frame, and the second end cooperates with the first stop to allow the second horizontal force to act on the leg beam in the extended position of the leg beam.
In an embodiment, the first end of the slider element cooperates with the leg beam and the second end cooperates with the leg frame to allow the leg beam to extend from the leg frame and to allow the fourth horizontal force to act on the leg beam in the first semi-extended position of the leg beam, the leg frame comprises a second stop, and the second end of the slider element cooperates with the second stop to allow the fourth horizontal force to act on the leg beam in the first semi-extended position of the leg beam.
In an embodiment, the first end of the slider element is slidably coupled to the leg beam to allow movement of the slider element relative to the leg beam between a first slider element position where the second end of the slider element is held by the leg beam and a second slider element position where the second end is allowed to slide relative to the leg frame, which allows the slider element to be received within the leg beam to not otherwise occupy in a retracted position and to allow mating with a plurality of stops on the leg frame.
In an embodiment, the leg assembly includes first and second leg beam actuators operable for moving the leg beam and the leg frame relative to each other and for moving the slider element and the leg beam relative to each other.
In an embodiment, the leg assembly is configured such that the first leg beam actuator is operable to allow the leg beam to move with the second leg beam actuator and the slider element relative to the leg frame, and the second actuator is operable to allow the leg beam to move with the slider element and the leg frame.
In an embodiment, the first leg beam actuator comprises a first leg actuation cylinder having a first cylinder portion and a first piston portion movable relative to the first cylinder portion and coupled to the leg frame, the second leg beam actuator comprises a second leg actuation cylinder having a second cylinder portion and a second piston portion movable relative to the second cylinder portion and coupled to the leg beam, and the first and second cylinder portions and the first end of the slider element are fixedly coupled to each other.
In another aspect, the present invention provides a vehicle comprising a leg assembly as described above.
In embodiments, the vehicle is a mobile crane.
Drawings
Further characteristics and advantages of the invention will become apparent from the description of the invention in the form of non-limiting and non-exclusive embodiments. These embodiments should not be construed as limiting the scope of the claims. It will be appreciated by those skilled in the art that other alternatives and equivalents of the invention can be conceived and reduced to practice without departing from the scope of the invention. Embodiments of the present invention will be described with reference to the accompanying drawings, wherein like or similar reference numerals designate like, identical or corresponding parts, and in which:
FIG. 1 shows a side view of a prior art leg assembly;
FIG. 2 illustrates a mobile crane having a leg assembly according to the present invention;
FIG. 3 shows a perspective view of an embodiment of a leg assembly according to the present invention;
4A-4D illustrate side views of the leg assembly of FIG. 3 with a single leg beam shown in cross-section from a retracted position in FIG. 4A to an intermediate position in FIGS. 4B and 4C to an extended position with the leg support in a support position on the support surface in FIG. 4D;
5A-5C illustrate side views of the leg assembly of FIG. 3 with a single leg beam shown in cross-section from the retracted position in FIG. 5A to the intermediate position in FIG. 5B to a first semi-extended position with the leg support in a support position on the support surface in FIG. 5C; and
fig. 6A and 6B show side views of the leg assembly of fig. 3 with a single leg beam shown in cross-section from the retracted position in fig. 6A to a second semi-extended position with the leg support in a support position on the support surface in fig. 6B.
Detailed Description
Fig. 2 shows the mobile crane in a position for operating the crane section. The leg beam 200 of the leg assembly 10 extends from the leg frame 100 as part of a mobile crane and the leg support 300 is placed in a supporting position on a support surface S, which may be a road surface, but may be any other substantially horizontal surface. The leg support in the extended position provides stability to the crane to allow handling of heavy loads. Fig. 3 shows in more detail the leg assembly 10 according to the invention, wherein the leg beams 200 are each in an extended position and the leg supports 300 are each in a support position to support the leg beams on a support surface S.
Fig. 4A-4D illustrate four stages to provide a leg beam 200 from a retracted position P4 of fig. 4A, where the leg beam is located within the leg frame 100, to an extended position P1 of fig. 4D, where the leg beam is fully extended from the leg frame. Fig. 4B and 4C illustrate intermediate positions of the leg beam 200 when the leg beam 200 is moved to the extended position of fig. 4D in the horizontal extending direction E with respect to the leg frame 100. The leg beam may be moved by operating the leg beam actuators 150, 160.
The leg frame 100 includes a movable cam 400, which movable cam 400 moves into a groove 211 provided in the topside surface of the leg beam in a fully extended position P1 shown in fig. 4D. In the embodiment shown, the cam is rotatable about an axis of rotation 410 and can be rotated into and out of the groove 211 by a cam actuator 450, but can also be moved into and out of the groove in any other suitable manner. In the illustrated embodiment, cam actuator 450 is a pneumatically controlled actuation cylinder, but may be any other suitable actuator, such as, for example, a hydraulically, manually, or electrically controlled actuation cylinder. The leg beam is coupled at its bottom side to the leg frame by a slider element 500. The slider element, in the form of a sliding rod in the embodiment shown, has a first end 501 and a second end 502. The first end 501 of the slider element is retained in the elongate slot 250 in the bottom region of the leg beam 200 by the protrusion of the slider element extending into the slot. The protrusion at the first end 501 of the slider element can slide along the slot between the first slot end 251 and the second slot end 252. Fig. 4D of the extended position of the leg beam shows the protrusion at the first end 501 of the slider element mating with the first slot end 251. The protrusion at the second end 502 of the slider element 500 mates with the first stop 111 in the bottom region of the leg frame 100.
In the extended position P1 of the leg beam of fig. 4D, the leg support 300 is in its support position SP. In the support position, the foot plate 310 of the leg support has been lowered onto the support surface S by operating the actuating cylinder 320 of the leg support. Fig. 4A-4C show the foot plate 310 of the leg support 300 in a raised position, which enables the leg beam to be moved back and forth between the retracted position P4 of fig. 4A and the extended position P1 of fig. 4D. The leg support 300 is coupled to the distal end 202 of the leg beam 200, while the leg beam is coupled to the leg frame 100 at its proximal end 201. The proximal end 201 and the distal end 202 of the leg beam are defined relative to the leg frame. In the extended position, the distal end 202 of the leg beam 200 is positioned away from the leg frame, while the proximal end 201 is positioned close to the leg frame. The proximal and distal ends are each intended to indicate a region at the end, and are not intended to indicate the endmost.
In the extended position of the leg beam 100 of fig. 4D, the leg support 300, together with one or more other leg supports coupled to one or more other leg beams, supports the weight of a vehicle (which is part of a mobile crane) and its load and load moment. Leg support 300 causes a first vertical force Fv1 to act upward at a first position L1 on the distal end 202 of the leg beam. The leg frame is supported on the leg beam by the cam 400 inserted into the first groove 211, which causes the second vertical force Fv2 to act downward at the second position L2 on the leg beam. The second position L2 is separated from the first position L1 by a first horizontal distance Dh1 towards the proximal end of the leg beam. In the embodiment shown, the second position L2 is near the extreme end of the proximal end of the leg beam. In practice, the force may be distributed over an area, but may be considered to act at a single location on the frame and as shown in the drawings. The first vertical force Fv1 and the second vertical force Fv2, separated by the first horizontal distance Dh1, cause a first torque to act on the leg beam.
The first torque is balanced by a second torque determined by the interaction between the leg frame and the leg beam through the cam 400 and slider element 500. A cam 400 coupled to leg frame 100 and inserted into first groove 211 causes a first horizontal force Fh1 to act outward at a third position L3 on the leg beam. In fact, the second position and the third position are the same or nearly the same, as both the second vertical force Fv2 and the first horizontal force Fh1 are caused by the cam 400 to act on the leg beam. Generally, the second position L2 and the third position L3 need not be the same. The slider element 500 causes a second horizontal force Fh2 to act inwardly at a fourth location L4 on the leg beam immediately adjacent the first slot end 251 by a protrusion at its first end 501 that is inserted into the slot 250 and mates with the first slot end 251. Horizontal forces are defined as outward or inward relative to the leg frame, the outward direction pointing away from the leg frame, and the inward direction pointing toward the interior of the leg frame. The second horizontal force Fh2 may be exerted by the slider element because its second end 502 engages the first stop 111 on the leg frame 100. The fourth position L4 is separated from the third position L3 by a first vertical distance Dv1 in the downward direction. The first horizontal force Fh1 and the second horizontal force Fh2, separated by the first vertical distance Dv1, cause a second torque to act on the leg beam. The slider element 500 also causes a smaller downward vertical force component to act on the leg beam due to the actual implementation of the illustrated embodiment. The same may be the case for providing the first level of force. However, these forces are substantially horizontal. Basically, the horizontal force component acts to cause the second torque.
Fig. 1 shows a prior art leg assembly with a leg beam 200 in its extended position from a leg frame 100 and a leg support 300 in a support position on a support surface. In the prior art leg assembly, the torques caused by vertical forces FvA and FvB acting on positions LA and LB, respectively, are balanced by another torque caused by vertical forces FvC and FvD acting on positions LB and LC, respectively. Positions LA and LB are separated by horizontal distance DhA, and positions LB and LC are separated by horizontal distance DhB. The torques generated by the vertical forces FvA, FvB and the horizontal distance DhA are compared to the first torques generated by the first and second vertical forces Fv1 and Fv2 and the first horizontal distance Dh1, while the torques generated by the vertical forces FvC, FcD and the horizontal distance DhB are replaced by the second torques generated by the first and second horizontal forces Fh1 and Fh2 and the first vertical distance Dv1 in the leg assembly according to the invention. The prior art leg assembly requires a relatively long leg beam to remain inserted inside the leg frame to allow for the torque created by vertical forces FvC and FvD and horizontal distance DhB, which is not required by the leg assembly according to the present invention.
Fig. 5A-5C illustrate three stages to provide a leg beam 200 from a retracted position P4, where the leg beam of fig. 5A is located within the leg frame 100, to a first semi-extended position P2, where the leg beam of fig. 5C is partially extended from the leg frame. The first semi-extended position P2 is between the retracted position P4 and the extended position P1 of fig. 4D. Fig. 5B illustrates a middle position of the leg beam 200 when the leg beam 200 is moved to the first half-extended position of fig. 5C in the horizontal extending direction E with respect to the leg frame 100.
The leg support 300 is in a support position SP in a first semi-extended position P2 shown in fig. 5C to support the leg assembly on a support surface S. The rotatable cam is further rotated to be inserted into the second groove 212 provided in the topside surface of the leg beam 200 in the first half extended position. The leg beam is coupled again to the leg frame at its bottom side by the slider element 500. The first end 501 of the slider element is retained in the elongate slot 250 in the bottom region of the leg beam 200 by the protrusion of the slider element extending into the slot. Fig. 5C of the first half-extended position of the leg beam shows the protrusion at the first end 501 of the slider element mating with the first slot end 251. The protrusion at the second end 502 of the slider element 500 mates with the second stop 112 in the bottom region of the leg frame 100.
In the first half-extended position of the leg beam of fig. 5C, the leg support 300 supports the leg beam and the leg frame. Leg support 300 causes a third vertical force Fv3 to act upward at a first position L1 on the distal end 202 of the leg beam. The leg frame is again supported on the leg beam by the cam 400 now inserted into the second groove 212, which causes a fourth vertical force Fv4 to act downwards at a fifth position L5 on the leg beam. The fifth position L5 is separated from the first position L1 by a second horizontal distance Dh2 towards the proximal end 201 of the leg beam. The second horizontal distance Dh2 is less than the first horizontal distance Dh1, and the second position L5 is in a horizontal position between the first position L1 and the second position L2. The third vertical force Fv3 and the fourth vertical force Fv4, separated by the second horizontal distance Dh2, cause a third torque to act on the leg beam.
The third torque is balanced by a fourth torque determined by the interaction between the leg frame and the leg beam, again through the cam 400 and slider element 500. A cam 400 coupled to the leg frame 100 and inserted into the second groove 212 causes a third horizontal force Fh3 to act outward at a sixth position L6 on the leg beam. The fifth position L5 and the sixth position L6 are identical or nearly identical because both the fourth vertical force Fv4 and the third horizontal force Fh3 are caused by the cam 400 to act on the leg beam. Generally, the fifth position L5 and the sixth position L6 need not be the same. The slider element 500 causes a fourth horizontal force Fh4 to act inwardly at a seventh location L7 on the leg beam immediately adjacent the first slot end 251 by a protrusion at its first end 501 that is inserted into the slot 250 and mates with the first slot end 251. Indeed, in the embodiment shown, the fourth position L4 and the seventh position L7 are the same position. The fourth horizontal force Fh4 may be caused by the slider element because its second end 502 engages the second stop 112 on the leg frame 100. The seventh position L7 is separated from the sixth position L6 by a second vertical distance Dv2 in the downward direction. In the embodiment shown, the first vertical distance Dv1 and the second vertical distance Dv2 are the same. The third horizontal force Fh3 and the fourth horizontal force Fh4, separated by the second vertical distance Dv2, cause a fourth torque to act on the leg beam. Again, as already described for the extended position P1, there may be a vertical force component in addition to the horizontal force. Basically, the horizontal force component acts to cause the fourth torque.
Fig. 6A and 6B illustrate two stages to provide leg beam 200 from a retracted position P4, where the leg beam of fig. 6A is located within leg frame 100, to a second semi-extended position P3, where the leg beam of fig. 6B is partially extended from the leg frame. The intermediate position is not shown. In the second semi-extended position of fig. 6B, the leg beam 200 extends a smaller distance from the leg frame 100 than in the first semi-extended position of fig. 5C.
The leg support 300 is in the support position SP in the second semi-extended position P3 shown in fig. 6B to support the leg assembly on the support surface S. Leg support 300 causes a fifth vertical force Fv5 to act upward at a first position L1 on the distal end 202 of the leg beam. The leg frame is in the second half-extended position P3 supported directly on the leg beam at the eighth position L8 such that a sixth vertical force Fv6 acts downwardly at the eighth position L8 on the leg beam. The eighth position L8 is separated from the first position L1 by a third horizontal distance Dh3 towards the proximal end 201 of the leg beam. The third horizontal distance Dh3 is less than the first horizontal distance Dh1, and the eighth position L8 is in a horizontal position between the first position L1 and the second position L2. In the embodiment shown, the third horizontal distance Dh3 is also less than the second horizontal distance Dh2, and the eighth position L8 is in a horizontal position between the first position L1 and the fifth position L5. The fifth vertical force Fv5 and the sixth vertical force Fv6, separated by the third horizontal distance Dh3, cause a fifth torque to act on the leg beam.
The fifth torque is balanced by a sixth torque determined by the direct interaction between the leg frame and the leg beam. The leg frame causes a seventh vertical force Fv7 to act downward at a ninth position L9 on the leg beam. In the embodiment shown, the eighth position L8 and the ninth position L9 are practically identical or almost identical, because there is a limited contact area between the upper side of the leg beam and the leg frame. In general, the eighth position L8 and the ninth position L9 need not be the same. In addition, the leg frame causes an eighth vertical force Fv8 to act upward at a tenth position L10 on the leg beam. The tenth position L10 is separated from the eighth position L8 by a fourth horizontal distance Dh4 in a direction towards the proximal end 201 of the leg beam. The seventh vertical force Fv7 and the eighth vertical force Fv8, separated by the fourth horizontal distance Dh4, cause a sixth torque to act on the leg beam. Since the sixth and seventh vertical forces Fv6, Fv7 act at (almost) the same positions L8, L9, they will add a single vertical force Fv6+ Fv 7. However, there are still two torques acting on the leg beam to balance each other.
The leg assembly comprises a first leg beam actuator 150 and a second leg beam actuator 160, said first and second leg beam actuators 150, 160 being operable for moving the leg beam 200 and the leg frame 100 relative to each other and for moving the slider element 500 and the leg beam 200 relative to each other. The first leg beam actuator 150 operates to move the leg beam 200 together with the second leg beam actuator 160 and the slider element 500 relative to the leg frame 100. The second actuator 160 operates to move the leg beam 200 relative to the slider element 500 and the leg frame 100. In the embodiment shown, the first leg beam actuator 150 comprises a first leg actuation cylinder having a first cylinder portion 151 and a first piston portion 152 movable relative to the first cylinder portion and coupled to the leg frame 100, and the second leg beam actuator 160 comprises a second leg actuation cylinder having a second cylinder portion 161 and a second piston portion 162 movable relative to the second cylinder portion and coupled to the leg beam 200. The first and second cylinder portions 151 and 161 and the first end of the slider element are fixedly coupled to each other.
In the retracted position P4 shown in fig. 4A, 5A, and 6A, the slider element 500 is in a first slider element position SE1 wherein the second end 502 of the slider element is retained by the leg beam 200. In the first slider element position SE1, the first end 501 of the slider element is at the second slot end 252 of the slot 250, while the second end 502 of the slider element 500 is held in the slider element groove 260 at the extreme end of the proximal end of the leg beam 200. To reach the second half-extended position P3, the first leg beam actuator 150 is operated to extend the first piston portion 152 from the first cylinder portion 151 to move from the leg frame 100 and extend the leg beam 200, while the slider element 500 remains in the first slider element position SE1, as shown in fig. 6B. Then, the support feet 310 of the leg support 300 are lowered onto the support surface S by the operation of the support cylinders 320 to support the leg assembly on the support surface and finally to the position as shown in fig. 6B.
To reach the first half-extended position P2 of fig. 5C, the second leg beam actuator 160 is operated to extend the second piston portion 162 from the second cylinder portion 161 to move from the leg frame 100 and extend the leg beam 200, as shown in the neutral position in fig. 5B. In this action, the slider element 500 does not move relative to the leg frame 100 because the first end 501 of the slider element 500 is fixedly connected to the first cylinder portion 151 and the second cylinder portion 161. Subsequently, the first leg beam actuator 150 is operated to extend the first piston portion 152 from the first cylinder portion 151 to further move from the leg frame 100 and extend the leg beam 200 to reach the leg beam position as shown in fig. 5C. The operation of the first and second leg beam actuators 150 and 160 may also overlap to reach the first semi-extended position P2 of fig. 5C. The second end 502 of the slider element 500 will slide over the leg frame 100 and end up abutting the second stop 112 on the leg frame. When the first and second leg beam actuators 150, 160 have been operated to move the leg beam in a position corresponding to the first half-extended position P2, the cam actuator 450 is operated to rotate the cam 400 about its axis of rotation 410 to move the cam into the second groove 212 in the top side of the leg beam. Then, the support feet 310 of the leg support 300 are lowered onto the support surface S by the operation of the support cylinders 320 to support the leg assembly on the support surface and finally to the position as shown in fig. 5C.
To reach the extended position P1 of fig. 4D, the first leg beam actuator 160 is operated to extend the first piston portion 152 from the first cylinder portion 151 to move from the leg frame 100 and extend the leg beam 200, while the slider element 500 remains in the first slider element position SE1, as already described above with reference to fig. 6B. When the second leg beam actuator 160 is operated to extend the second piston portion 162 from the second cylinder portion 161 to move further from the leg frame 100 and extend the leg beam 200, the second end 502 of the slider element should be in a horizontal position between the first stopper 111 and the second stopper 112 or preferably above the second stopper 112, as shown in fig. 4B. In the case where the second leg beam actuator 160 is operated only from the intermediate position shown in fig. 4B, the second leg beam actuator 160 reaches the intermediate position shown in fig. 4C. In this action, the slider element 500 does not move relative to the leg frame 100 because the first end 501 of the slider element 500 is fixedly connected to the first cylinder portion 151 and the second cylinder portion 161, as already described above with reference to fig. 5B. Subsequently, the first leg beam actuator 150 is operated to extend the first piston portion 152 from the first cylinder portion 151 to further move from the leg frame 100 and extend the leg beam 200 to reach the leg beam position as shown in fig. 4D. The operation of the first and second leg beam actuators 150 and 160 may also overlap to reach the leg beam position of fig. 4D from the leg beam position of fig. 4C. This is equivalent to what has been described above with reference to fig. 5C. The second end 502 of the slider element 500 will slide over the leg frame 100 and end up abutting against the first stop 111 on the leg frame. When the first and second leg beam actuators 150, 160 have been operated to move the leg beam in a position corresponding to the extended position P1, the cam actuator 450 is operated to rotate the cam 400 about its axis of rotation 410 to move the cam into the first groove 211 in the top side of the leg beam. Then, the support feet 310 of the leg support 300 are lowered onto the support surface S by the operation of the support cylinders 320 to support the leg assembly on the support surface and finally to the position as shown in fig. 4D.
It is apparent from the above description that retracting the legrest beam 100 from one of the extended position P1 of fig. 4D or the first and second semi-extended positions P2 and P3 of fig. 5C and 6B, respectively, to the retracted position P4 of fig. 4A, 5A and 6A requires a suitable reversal of the above steps.
Claims (19)
1. A leg assembly (10) for supporting a vehicle on a support surface (S), the leg assembly comprising
-a leg frame (100);
-a leg beam (200),
the leg beam is movable in a horizontal extension direction (E) relative to the leg frame between a retracted position (P4) in which the leg beam is located within the leg frame and an extended position (P1) in which the leg beam extends from the leg frame, and
in the extended position of the leg beam, the leg beam has a proximal end (201) and a distal end (202) relative to the leg frame; and
-a leg support (300), the leg support (300) being coupled to the distal end of the leg beam to allow supporting the leg assembly on a support surface in a Support Position (SP) of the leg support,
the leg assembly is configured such that in the extended position of the leg beam and the support position of the leg support,
-a first torque acts on the leg beam, the first torque being determined by a first vertical force (Fv1) acting upwards at a first position (L1) on the distal end of the leg beam and a second vertical force (Fv2) acting downwards at a second position (L2) on the leg beam, the second position being separated from the first position by a first horizontal distance (Dh1) towards the proximal end of the leg beam, the first and second vertical forces acting as a result of the leg beam being supported by the leg support and the leg frame being supported by the leg beam, respectively, and
-a second torque acts on the leg beam to balance the first torque, the second torque being determined by the interaction between the leg frame and the leg beam,
wherein the second torque is at least substantially determined by a first horizontal force (Fh1) acting outwardly with respect to the leg frame at a third position (L3) on the leg beam and a second horizontal force (Fh2) acting inwardly with respect to the leg frame at a fourth position (L4) on the leg beam, the fourth position being separated from the third position by a first vertical distance (Dv1) in a downward direction.
2. The leg assembly as claimed in the preceding claim, wherein the second and third positions are at the proximal end of the leg beam, optionally at the extreme end of the proximal end.
3. The leg assembly as claimed in any one of the preceding claims, wherein the second and third positions are coincident positions.
4. The leg assembly as claimed in any one of the preceding claims, wherein the leg beam is movable in the extension direction (E) to a first half-extended position (P2) between the retracted position (P4) and the extended position (P1), the leg assembly being configured such that in the first half-extended position of the leg beam and the support position of the leg support,
-a third torque acts on the leg beam, the third torque being determined by a third vertical force (Fv3) acting upwards at the first position (L1) on the distal end of the leg beam and a fourth vertical force (Fv4) acting downwards at a fifth position (L5) on the leg beam, the fifth position being separated from the first position by a second horizontal distance (Dh2) towards the proximal end of the leg beam that is smaller than the first horizontal distance (Dh1), the third and fourth vertical forces acting as a result of the support of the leg beam by the leg support and the support of the leg frame by the leg beam, respectively, and
-a fourth torque acts on the leg beam to balance the third torque, the fourth torque being determined by the interaction between the leg frame and the leg beam,
wherein the fourth torque is at least substantially determined by a third horizontal force (Fh3) acting outwardly with respect to the leg frame at a sixth position (L6) on the leg beam and a fourth horizontal force (Fh4) acting inwardly with respect to the leg frame at a seventh position (L7) on the leg beam, the seventh position being separated from the sixth position by a second vertical distance (Dv2) in a downward direction.
5. The leg assembly of the preceding claim, wherein the fifth and sixth positions (L5, L6) are coincident positions.
6. The leg assembly according to any one of the two preceding claims, wherein the fourth and seventh positions (L4, L7) are coincident positions.
7. The leg assembly as claimed in any one of the preceding claims, wherein the leg beam is movable in the extension direction (E) to a second half-extended position (P3) between the retracted position (P4) and the extended position (P1),
the leg assembly is configured such that in the second semi-extended position of the leg beam and the support position of the leg support,
-a fifth torque acts on the leg beam, the fifth torque being determined by a fifth vertical force (Fv5) acting upwards at the first position (L1) on the distal end of the leg beam and a sixth vertical force (Fv6) acting downwards at an eighth position (L8) on the leg beam, the eighth position being separated from the first position by a third horizontal distance (Dh3) towards the proximal end of the leg beam that is smaller than the first horizontal distance (Dh1), the fifth and sixth vertical forces acting as a result of the leg beam being supported by the leg support and the leg frame being supported by the leg beam, respectively, and
-a sixth torque acts on the leg beam to balance the fifth torque, the sixth torque being determined by the interaction between the leg frame and the leg beam,
wherein the sixth torque is determined by a seventh vertical force (Fv7) acting downward at a ninth position (L9) on the leg beam and an eighth vertical force (Fv8) acting upward at a tenth position (L10) on the leg beam, the tenth position being separated from the ninth position by a fourth horizontal distance (Dh4) toward the proximal end of the leg beam.
8. The leg assembly of the preceding claim, wherein the second semi-extended position (P3) is between the retracted position (P4) and the first semi-extended position (P2), and the third horizontal distance (Dh3) is less than the second horizontal distance (Dh 2).
9. The leg assembly as claimed in any one of the preceding claims, wherein the leg frame comprises a movable cam (400), the movable cam (400) being movable into a first or second groove (211, 212) corresponding to the second and third positions (L2, L3) or the fifth and sixth positions (L5, L6), respectively, so as to allow the second vertical force (Fv2) and the first horizontal force (Fh1) or the fourth vertical force (Fv4) and the third horizontal force (Fh3) to act on the leg beam in the extended position (P1) or the first half extended position (P2) of the leg beam, respectively, optionally the movable cam being a rotatable cam, optionally the movable cam being able to be actuated by a cam actuator (450), optionally an actuating cylinder, optionally a pneumatic cylinder, optionally, A hydraulically, electrically or manually controlled actuating cylinder operates, optionally the first or second recess is provided in an upper surface of the leg beam.
10. The leg assembly as claimed in any one of the preceding claims, wherein the leg frame comprises a movable cam (400), the movable cam (400) being movable into a first groove (211) corresponding to the second and third positions (L2, L3) so as to allow the second vertical force (Fv2) and a first horizontal force (Fh1) to act on the leg beam in the extended position (P1) of the leg beam and into a second groove (212) corresponding to the fifth and sixth positions (L5, L6) so as to allow the fourth vertical force (Fv4) and the third horizontal force (Fh3) to act on the leg beam in the first half extended position (P2) of the leg beam, optionally the movable cam being a rotatable cam, optionally the movable cam being able to be acted on by a cam actuator (450), An optionally actuated cylinder, optionally pneumatically, hydraulically, electrically or manually controlled actuated cylinder, optionally the first and second recesses being provided in an upper surface of the leg beam.
11. The leg assembly according to any one of the preceding claims, wherein the leg assembly comprises a slider element (500), the slider element (500) having a first and a second end (501, 502), the first end (501) cooperating with the leg beam and the second end (502) cooperating with the leg frame to allow the leg beam to extend from the leg frame and to allow the second horizontal force (Fh2) to act on the leg beam in the extended position (P1) of the leg beam, optionally the first end of the slider element being slidably coupled to the leg beam to allow movement of the slider element relative to the leg beam.
12. The leg assembly of the preceding claim, wherein the leg frame comprises a first stop (111) with which the second end of the slider element can slide relative to the leg frame when the leg beam is extended from the leg frame and with which the second end cooperates to allow the second horizontal force (Fh2) to act on the leg beam in the extended position (P1) of the leg beam.
13. The leg assembly as claimed in the preceding claim when dependent on claim 4, wherein the first end (501) of the slider element cooperates with the leg beam and the second end (502) cooperates with the leg frame to allow the leg beam to extend from the leg frame and to allow the fourth horizontal force (Fh4) to act on the leg beam in the first half-extended position (P2) of the leg beam, the leg frame including a second stop (112), and the second end of the slider element cooperates with the second stop to allow the fourth horizontal force (Fh4) to act on the leg beam in the first half-extended position (P2) of the leg beam.
14. The leg assembly as claimed in the preceding claim, wherein the first end of the slider element is slidably coupled to the leg beam to allow movement of the slider element relative to the leg beam between a first slider element position (SE1) in which the second end of the slider element is held by the leg beam and a second slider element position (SE2) in which the second end is allowed to slide relative to the leg frame.
15. The leg assembly of the preceding claim, wherein the leg assembly comprises first and second leg beam actuators (150, 160), the first and second leg beam actuators (150, 160) being operable for moving the leg beam and the leg frame relative to each other and for moving the slider element and the leg beam relative to each other.
16. The leg assembly of the preceding claim, wherein the leg assembly is configured such that the first leg beam actuator (150) is operable to allow the leg beam to move relative to the leg frame with the second leg beam actuator (160) and the slider element, and the second actuator is operable to allow the leg beam to move relative to the slider element and the leg frame.
17. The leg assembly of the preceding claim, wherein the first leg beam actuator (150) comprises a first leg actuation cylinder having a first cylinder portion (151) and a first piston portion (152) movable relative to the first cylinder portion and coupled to the leg frame, the second leg beam actuator (160) comprises a second leg actuation cylinder having a second cylinder portion (161) and a second piston portion (162) movable relative to the second cylinder portion and coupled to the leg beam, and the first and second cylinder portions and the first end of the slider element are fixedly coupled to each other.
18. A vehicle comprising a leg assembly according to any preceding claim.
19. Vehicle according to the preceding claim, wherein the vehicle is a mobile crane.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2019784 | 2017-10-23 | ||
| NL2019784A NL2019784B1 (en) | 2017-10-23 | 2017-10-23 | Outrigger assembly and vehicle, such as a mobile crane, comprising the outrigger assembly |
| PCT/NL2018/050695 WO2019083357A1 (en) | 2017-10-23 | 2018-10-22 | Outrigger assembly and vehicle, such as a mobile crane, comprising the outrigger assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111542486A true CN111542486A (en) | 2020-08-14 |
| CN111542486B CN111542486B (en) | 2021-10-29 |
Family
ID=60957410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880079603.1A Active CN111542486B (en) | 2017-10-23 | 2018-10-22 | Leg assembly and vehicle, such as a mobile crane, comprising a leg assembly |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP3700853B1 (en) |
| JP (1) | JP7234245B2 (en) |
| KR (1) | KR102687586B1 (en) |
| CN (1) | CN111542486B (en) |
| NL (1) | NL2019784B1 (en) |
| WO (1) | WO2019083357A1 (en) |
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| US3545627A (en) * | 1968-12-30 | 1970-12-08 | Letourneau Inc | Heavy duty crane for use in a narrow loading area |
| US3756424A (en) * | 1971-12-27 | 1973-09-04 | Harnischfeger Corp | Mobile crane outrigger assembly |
| US5580095A (en) * | 1993-06-28 | 1996-12-03 | Kabushiki Kaisha Komatsu Seisakusho | Vehicle body levelling device for a working vehicle having outriggers |
| CN1543527A (en) * | 2001-03-02 | 2004-11-03 | ��ˢʦ�ɷݹ�˾ | Mobile working machine provided with stability monitoring |
| CN101457589A (en) * | 2008-12-26 | 2009-06-17 | 三一重工股份有限公司 | Construction machine |
| CN203772457U (en) * | 2014-01-17 | 2014-08-13 | 泰科思（深圳）传感器有限公司 | Measuring system for determining bearing force on bearing element of bearing structure |
| EP3096119A1 (en) * | 2014-01-17 | 2016-11-23 | Tecsis (Shenzhen) Sensor Co. Ltd. | Measurement system for determining support force |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0786075B2 (en) * | 1988-02-19 | 1995-09-20 | 古河機械金属株式会社 | Outrigger operating device |
| JP2535042Y2 (en) * | 1990-04-24 | 1997-05-07 | 株式会社タダノ | Outrigger device |
| JP4772970B2 (en) * | 2001-01-30 | 2011-09-14 | 株式会社タダノ | Work vehicle outrigger |
| CN102381291B (en) * | 2011-09-14 | 2014-09-10 | 三一汽车制造有限公司 | Retractable support leg and engineering machine with same |
| DE102015003634A1 (en) * | 2015-03-19 | 2016-09-22 | Liebherr-Werk Ehingen Gmbh | Sliding beam for supporting a working machine |
-
2017
- 2017-10-23 NL NL2019784A patent/NL2019784B1/en active
-
2018
- 2018-10-22 KR KR1020207014800A patent/KR102687586B1/en active IP Right Grant
- 2018-10-22 JP JP2020543453A patent/JP7234245B2/en active Active
- 2018-10-22 EP EP18814706.0A patent/EP3700853B1/en active Active
- 2018-10-22 WO PCT/NL2018/050695 patent/WO2019083357A1/en unknown
- 2018-10-22 CN CN201880079603.1A patent/CN111542486B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3545627A (en) * | 1968-12-30 | 1970-12-08 | Letourneau Inc | Heavy duty crane for use in a narrow loading area |
| US3756424A (en) * | 1971-12-27 | 1973-09-04 | Harnischfeger Corp | Mobile crane outrigger assembly |
| US5580095A (en) * | 1993-06-28 | 1996-12-03 | Kabushiki Kaisha Komatsu Seisakusho | Vehicle body levelling device for a working vehicle having outriggers |
| CN1543527A (en) * | 2001-03-02 | 2004-11-03 | ��ˢʦ�ɷݹ�˾ | Mobile working machine provided with stability monitoring |
| CN101457589A (en) * | 2008-12-26 | 2009-06-17 | 三一重工股份有限公司 | Construction machine |
| CN203772457U (en) * | 2014-01-17 | 2014-08-13 | 泰科思（深圳）传感器有限公司 | Measuring system for determining bearing force on bearing element of bearing structure |
| EP3096119A1 (en) * | 2014-01-17 | 2016-11-23 | Tecsis (Shenzhen) Sensor Co. Ltd. | Measurement system for determining support force |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3700853B1 (en) | 2023-11-22 |
| JP2021500285A (en) | 2021-01-07 |
| KR20200071121A (en) | 2020-06-18 |
| CN111542486B (en) | 2021-10-29 |
| EP3700853C0 (en) | 2023-11-22 |
| NL2019784B1 (en) | 2019-04-29 |
| EP3700853A1 (en) | 2020-09-02 |
| WO2019083357A1 (en) | 2019-05-02 |
| KR102687586B1 (en) | 2024-07-24 |
| JP7234245B2 (en) | 2023-03-07 |
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