CA2069821C - Transporter with function of maintaining and moving center of gravity - Google Patents
Transporter with function of maintaining and moving center of gravityInfo
- Publication number
- CA2069821C CA2069821C CA002069821A CA2069821A CA2069821C CA 2069821 C CA2069821 C CA 2069821C CA 002069821 A CA002069821 A CA 002069821A CA 2069821 A CA2069821 A CA 2069821A CA 2069821 C CA2069821 C CA 2069821C
- Authority
- CA
- Canada
- Prior art keywords
- transporter
- arm
- arm means
- drive
- wheel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
- B62B3/00—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor
- B62B3/04—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
- B62B3/00—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor
- B62B3/04—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment
- B62B3/06—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground
- B62B3/0612—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground power operated
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Handcart (AREA)
- Manipulator (AREA)
- Intermediate Stations On Conveyors (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Motorcycle And Bicycle Frame (AREA)
Abstract
A transporter comprises generally a drive arm and a drive mechanism. In response to variation of an inclination angle of a ground surface, the drive mechanism is actuated to move the drive arm, thus holding the center of gravity of an object always above an axle of wheels.
Description
nArK~l?nuNn n~ Tl~l~ TNVF:NTTON
The present invention relates to a transporter which enables an operator to carry by himself an obJect having a heavy weight as far as a predetermined place.
Conventionally, when carrying an obJect having a weight wllich is too heavy to lift by oneself, transport work should be carried out by a plurality of operators, or by a specia]. vehicle such as forklift, 10 truck with crane, etc.
With the prior art transporter, particularly, with the above special vehicle which is used when carrying an o~ect having a weight whicll is too heavy to lift by oneself, however, not only the arrangement itself is extremely expensive, but the operator should be highly skilled in operation ~or smooth executlon.
Further, if ground or ~loor surface of a place on whlch transport work is carrled out is not fla-t, the ob~ect to be put on a carrier should be fixed thereto so as not to slip of~ therefrom durin~ transport.
It is, therefore, an obJect of the present invention to provide a transporter having a simple meChalliSIII W}liCh enables any operator to sa~ely and easily manipulate same by himself witllout any specialized operation technique.
~illMMAl?Y Ol~ l'H~ TNVF.~`ITTON
There is provided, according to the present invention, a transporter for carrying ~ ative to a horl-zontal ground surface an object having a center o~
gravity, comprising:
r 206~821 - first arm means for lifting the object, the first arm means having a longitudinal center line;
- second arm means, operatively connected to the first arm means at one end thereof, for supporting the first arm means;
- wheel means, rotatably mounted to the second arm means, for enabling movement of the transporter, the wheel means having an axis of rotation, the first arm means being disposed relative to the wheel means so that the longitudinal 10 center line of the first arm means extends through the axis of the wheel means and a pivot point between the first and second arm means;
- drive means, interposed between the first and second arm means, for driving the first arm means;
- setting means, connected to the drive means, for initially setting the first arm means so that the center of gravity of the object is above the axis of the wheel means;
- sensor means connected to the second arm means for sensing a variation of an inclination angle of the second arm 20 means relative to the horizontal ground surface; and - a microcomputer based control unit connected to the drive means, the setting means and the sensor means, the microcomputer based control unit controlling the drive means such that the drive means move the first arm means relative to the second arm means in response to the sensed variation of the inclination angle of the second arm means relative to the horizontal ground surface so as to maintain the center of gravity of the object above the axis of the wheel means regardless of the inclination angle of the second arm means 30 relative to the horizontal ground surface.
~ ', ....
2a 206~82 1 n~T~F n~ RTPTTnN ~F T~ nRAWTN~
Fig. 1 is a perspective view showing a preferred embodiment of a transporter according to the present invention;
Fig. 2 is a plan view of the transporter of Fig.
1 ;
~ ig. 3 is a front view of the transporter as viewed from the side of a drag bar;
Fig. 4 is a rear view of the transporter as viewed from the side of rear wheels;
Fig. 5 is a side view of the transporter when lifting up an ob~ect;
Fig. 6 is a view similar to Fig. 5, but after lifting up the ob~ect;
Fig. 7 is a view similar to Fig. 6, but immediately before front wheels reach an up inc]ine;
Fig. 8 is a view similar to Fig. 7, but when the transporter is moving on the up incline;
Fig. 9 is a view similar to ~ig. 8, but immediately before the front wheels reach a down incline;
Fig. 10 is a view similar to Fig. 9, but when the transporter is moving on the down incline;
Fig. 11 is a view similar to Fig. 1, but showing another embodiment of a transporter havin~ drive arms with extension mechanism;
Fig. 12 is a view similar to ~Ig. ]], bllt showing still another embodiment of a transporter wherein the mounting position of drive shafts and cylinders is _ ~~
.
A
...~
changed; and Fig. 13 is a view similar to ~ig. 12, but showing the other embodiment of a transporter having shortened auxiliary arms.
T)FTATT.Fn T)F.~,RTPTTON OF TTIF. TNV~NTTON
Referring to the drawings, a preferred embodiment of the present invention will be described.
Referring first to Figs. 1-4, a transporter includes a pair of drive arms (first arm means) 1 each arranged on an auxiliary arm (second arm means) 4, and a pair of operation arms 2 each mounted thereto. The operation arms 2 have the other ends connected by a drag bar 3 to which a control part 5 for setting operation mode of the transporter is mounted.
Connected to each drive arm 1 in the upper end portion thereof via a chain 11 is a hook 12 for catch an object 13 (not seen here) to be carried. Inclination of each drive arm 1 is adjustable by a drive shaft 9 (drive means) slidably fitted in a cylinder 10 (drive means). The transporter is movable by a pair of front wheels 7 (wheel means) with an axle 6 and a pair of rear wheels 8 rotatably mounted to the auxiliary arms 4, respectively. Up and down switches 17, 18 are arranged to the auxiliary arms 4 at the front end portions thereof, respectively, so as to turn on and off when the operation arms 2 rotate in pressing springs 19. Reinforcing plates 20, 21 are arranged between the auxiliary arms 4.
Next, the operation of this embodiment will be described. Referring particularly to Fig. 5, when lifting up the object 13 to be carried, the transporter is moved so that the object 13 is located between the two auxiliary arms 4. The hook 12 as fixed to the chain 11 at one end thereof is caught to a belt 14 which is put round the object 13. When a lift operation switch is turned on by the control part 5 mounted to the drag rod 3, a motor of a hydraulic pump 23 within the drive arm 1 is rotated so that the drive shaft 9 within the cylinder 10 extends in the direction of the control part 5 by a worm gear mechanism (not shown), thus rotating the drive arm 1 in the direction of the control part 5. Referring to Fig. 6, the drive arm 1 is automatically stopped when the center of gravity of the object 13 as lifted up comes above the axle 6. Referring also to Fig. 1, movement of the center of gravity of the object 13 is detectable by a level switch 24 mounted within the auxiliary arm 4. This level switch 24 assumes a neutral position when the auxiliary arm 4 is horizontal.
Next, prior to dragging of the transporter, operation mode of the control part 5 is set to automatic mode. The automatic mode is opposed to so-called manual mode, and corresponds in the present invention to operation mode for driving a drive mechanism of the transporter so as to automatically and always hold the center of gravity of the object 13 above the axle 6 in response to variation of an inclination angle of a ground surfacc 15 on which transport work is carrying out. The manual mode corresponds to operation mode wherein an operator operates the drive mechanism of the transporter on his judgement when lifting down the object 13 after its transport to a predetermined place or carrying out fine adjustment of a position of the drive arm 1 which will be described hereinafter.
Referring to Fig. 7, after setting operation mode to automatic mode by the control part 5, if the transporter encounters, for example, an up incline while the operator drags same with the drag rod 3 to carry the object 13, the transporter behaves as follows.
Referring also to Fig. 7, when the operator passes from a flat of the ground surface to the up 2069~21 incline thereof, an operation arm 2 is pivoted upward on a supporting shaft 16 as a fulcrum so that an up switch 17 is turned on by the operation arm 2 on the upper face thereof, thus starting operation of the drive shaft 9 to rotate the drive arm 1 on the side of the drag rod 3. Referring to Fig. 8, the operator continues to go on the up incline, and when a front wheel 7 of the transporter reaches the up incline, the upper face of the operation arm 2 is disengaged from the up switch 17 to turn off same. Accordingly, in case that the transporter is on the up incline, the operator is merely required to pull, within a period of time from turning-on of the up switch 17 to turning-off thereof, the transporter with the drag rod 3 at a speed that the center of gravity of the object 13 comes always above the axle 6.
On the other hand, referring to Fig. 9, when the operator passes from the flat of the ground surface to a down incline thereof, the operation arm 2 is pivoted downward on the supporting shaft 16 as a fulcrum so that an down switch 18 is turned on by the operation arm 2 on the lower face thereof, thus starting operation of the drive shaft 9 to rotate the drive arm 1 on the side of a rear wheel 8. Referring to Fig.
10, the operator continues to go on the down incline, and when the front wheel 7 of the transporter reaches the down incline, the down face of the operation arm 2 is disengaged from the down switch 18 to turn off same. Accordingly, in case that the transporter is on the down incline, the operator is merely required to pull, within this period of time, the transporter with the drag rod 3 at a speed that the center of gravity of the object 13 comes always above the axle 6.
If a stop position of the drive shaft 9, i.e., a position of the center of gravity of the obJect 13, is not optimal when the up switch 17 or the down switch 18 is turned off, the position of the drive arm 1 can 2~69821 be adjusted fine, if necessary, by switching operation mode to manual mode.
When putting down the object 13 on the ground after its transport to the predetermined place, the drive arm 1 is rotated on the side of the rear wheel 8 in manual mode.
Having described an embodiment with reference to the drawings, it is to be noted that the present invention is not limited thereto, but various modifications may be made therein without departing from the scope of the claims. By way of example, the following modifications or the combination thereof are possible.
First, the drive mechanism for operating the drive arm 9 may be of the combination of an electric motor and a mechanical device, and include a pneumatic cylinder.
Secondly, when the drive mechanism uses electric power, a power source may be of a charging type battery or a small-sized generator, or of a power supply for domestic use by providing a power cord.
Thirdly, different lifting members such as lever type vacuum suction cup, etc. can be used in place of the hook 12.
Fourthly, a sensor control system can be added to correctly recognize the amplitude of variation of the inclination angle of the ground surface 15 during transport, and accurately indicate and control the amplitude of movement of the drive arm 1 relative to the above amplitude of variation.
Fifthly, referring to Fig. 5, if the transporter is designed and constructed to have a form enabling a larger angle formed by the operation arm 2 and the ground surface 15, the center of gravity of the object 13 can be held always above the axle 6 in keeping always the rear wheel 8 apart from the ground surface 15 during transport.
Sixthly, in case that the ground surface 15 or a contact surface is flat as far as a predetermined point to which the object 13 has to be transported, and that the center of gravity of the object 13 is relatively stable, a rack may be mounted on the auxiliary arm 4 to carry the object 13, the lower face thereof being in contact with the rack during transport.
Seventhly, a reinforcing member can be added between the drive arm 1 and the auxiliary arm 4 for preventing torsion of the transporter, or a brake mechanism can be added for increasing the safety of work during movement of the transporter.
Eighthly, an extension mechanism can be added to the drive arm 1, the auxiliary arm 4 or the drag bar 3, or all thereof for further increase in the operativity of the transporter.
Ninthly, referring to Fig. 11, in case that the drive arm 1 is provided with an extension mechanism, if the two auxiliary arms 4 are integrally formed to be an U-shape, and the front wheel 7 is mounted within the auxiliary arm 4, and the axle 6 and the reinforcing plates 20, 21 are eliminated, the object 13 can be lifted up and down only by extension motion of the drive arm 1, resulting in more facile transport of heavy or long object.
Tenthly, referring to Fig. 12, the mounting position of the drive shaft 9 and the cylinder 10 can be changed to drive the drive arm 1 on the side of the drag arm 3.
Eleventhly, referring to Fig. 13, if the length of the auxiliary arm 4 is decreased in addition to the modification No. 10, transport work can be done without an end of the drive arm 4 being knocked against a wall when lifting up the obJect 13 located near the wall, or lifting down same near the wall.
Upon lifting-up or lifting-down of the object 13, for 206~821 minimizing a load applying to the operator by movement of the center of gravity of the object 13 with rotation of the drive arm 1, a support 22 as usually received or housed within the auxiliary arm 4 is drawn out temporarily therefrom so that one end thereof touches to the ground. If the drag bar 3 with extension mechanism is adopted, and the operator holds same in its extension state upon lifting-up or lifting-down of the object 13, the above load can be further decreased.
Lastly, the transporter may be provided with traction means such as an engine, etc. for automatic operation.
The present invention relates to a transporter which enables an operator to carry by himself an obJect having a heavy weight as far as a predetermined place.
Conventionally, when carrying an obJect having a weight wllich is too heavy to lift by oneself, transport work should be carried out by a plurality of operators, or by a specia]. vehicle such as forklift, 10 truck with crane, etc.
With the prior art transporter, particularly, with the above special vehicle which is used when carrying an o~ect having a weight whicll is too heavy to lift by oneself, however, not only the arrangement itself is extremely expensive, but the operator should be highly skilled in operation ~or smooth executlon.
Further, if ground or ~loor surface of a place on whlch transport work is carrled out is not fla-t, the ob~ect to be put on a carrier should be fixed thereto so as not to slip of~ therefrom durin~ transport.
It is, therefore, an obJect of the present invention to provide a transporter having a simple meChalliSIII W}liCh enables any operator to sa~ely and easily manipulate same by himself witllout any specialized operation technique.
~illMMAl?Y Ol~ l'H~ TNVF.~`ITTON
There is provided, according to the present invention, a transporter for carrying ~ ative to a horl-zontal ground surface an object having a center o~
gravity, comprising:
r 206~821 - first arm means for lifting the object, the first arm means having a longitudinal center line;
- second arm means, operatively connected to the first arm means at one end thereof, for supporting the first arm means;
- wheel means, rotatably mounted to the second arm means, for enabling movement of the transporter, the wheel means having an axis of rotation, the first arm means being disposed relative to the wheel means so that the longitudinal 10 center line of the first arm means extends through the axis of the wheel means and a pivot point between the first and second arm means;
- drive means, interposed between the first and second arm means, for driving the first arm means;
- setting means, connected to the drive means, for initially setting the first arm means so that the center of gravity of the object is above the axis of the wheel means;
- sensor means connected to the second arm means for sensing a variation of an inclination angle of the second arm 20 means relative to the horizontal ground surface; and - a microcomputer based control unit connected to the drive means, the setting means and the sensor means, the microcomputer based control unit controlling the drive means such that the drive means move the first arm means relative to the second arm means in response to the sensed variation of the inclination angle of the second arm means relative to the horizontal ground surface so as to maintain the center of gravity of the object above the axis of the wheel means regardless of the inclination angle of the second arm means 30 relative to the horizontal ground surface.
~ ', ....
2a 206~82 1 n~T~F n~ RTPTTnN ~F T~ nRAWTN~
Fig. 1 is a perspective view showing a preferred embodiment of a transporter according to the present invention;
Fig. 2 is a plan view of the transporter of Fig.
1 ;
~ ig. 3 is a front view of the transporter as viewed from the side of a drag bar;
Fig. 4 is a rear view of the transporter as viewed from the side of rear wheels;
Fig. 5 is a side view of the transporter when lifting up an ob~ect;
Fig. 6 is a view similar to Fig. 5, but after lifting up the ob~ect;
Fig. 7 is a view similar to Fig. 6, but immediately before front wheels reach an up inc]ine;
Fig. 8 is a view similar to Fig. 7, but when the transporter is moving on the up incline;
Fig. 9 is a view similar to ~ig. 8, but immediately before the front wheels reach a down incline;
Fig. 10 is a view similar to Fig. 9, but when the transporter is moving on the down incline;
Fig. 11 is a view similar to Fig. 1, but showing another embodiment of a transporter havin~ drive arms with extension mechanism;
Fig. 12 is a view similar to ~Ig. ]], bllt showing still another embodiment of a transporter wherein the mounting position of drive shafts and cylinders is _ ~~
.
A
...~
changed; and Fig. 13 is a view similar to ~ig. 12, but showing the other embodiment of a transporter having shortened auxiliary arms.
T)FTATT.Fn T)F.~,RTPTTON OF TTIF. TNV~NTTON
Referring to the drawings, a preferred embodiment of the present invention will be described.
Referring first to Figs. 1-4, a transporter includes a pair of drive arms (first arm means) 1 each arranged on an auxiliary arm (second arm means) 4, and a pair of operation arms 2 each mounted thereto. The operation arms 2 have the other ends connected by a drag bar 3 to which a control part 5 for setting operation mode of the transporter is mounted.
Connected to each drive arm 1 in the upper end portion thereof via a chain 11 is a hook 12 for catch an object 13 (not seen here) to be carried. Inclination of each drive arm 1 is adjustable by a drive shaft 9 (drive means) slidably fitted in a cylinder 10 (drive means). The transporter is movable by a pair of front wheels 7 (wheel means) with an axle 6 and a pair of rear wheels 8 rotatably mounted to the auxiliary arms 4, respectively. Up and down switches 17, 18 are arranged to the auxiliary arms 4 at the front end portions thereof, respectively, so as to turn on and off when the operation arms 2 rotate in pressing springs 19. Reinforcing plates 20, 21 are arranged between the auxiliary arms 4.
Next, the operation of this embodiment will be described. Referring particularly to Fig. 5, when lifting up the object 13 to be carried, the transporter is moved so that the object 13 is located between the two auxiliary arms 4. The hook 12 as fixed to the chain 11 at one end thereof is caught to a belt 14 which is put round the object 13. When a lift operation switch is turned on by the control part 5 mounted to the drag rod 3, a motor of a hydraulic pump 23 within the drive arm 1 is rotated so that the drive shaft 9 within the cylinder 10 extends in the direction of the control part 5 by a worm gear mechanism (not shown), thus rotating the drive arm 1 in the direction of the control part 5. Referring to Fig. 6, the drive arm 1 is automatically stopped when the center of gravity of the object 13 as lifted up comes above the axle 6. Referring also to Fig. 1, movement of the center of gravity of the object 13 is detectable by a level switch 24 mounted within the auxiliary arm 4. This level switch 24 assumes a neutral position when the auxiliary arm 4 is horizontal.
Next, prior to dragging of the transporter, operation mode of the control part 5 is set to automatic mode. The automatic mode is opposed to so-called manual mode, and corresponds in the present invention to operation mode for driving a drive mechanism of the transporter so as to automatically and always hold the center of gravity of the object 13 above the axle 6 in response to variation of an inclination angle of a ground surfacc 15 on which transport work is carrying out. The manual mode corresponds to operation mode wherein an operator operates the drive mechanism of the transporter on his judgement when lifting down the object 13 after its transport to a predetermined place or carrying out fine adjustment of a position of the drive arm 1 which will be described hereinafter.
Referring to Fig. 7, after setting operation mode to automatic mode by the control part 5, if the transporter encounters, for example, an up incline while the operator drags same with the drag rod 3 to carry the object 13, the transporter behaves as follows.
Referring also to Fig. 7, when the operator passes from a flat of the ground surface to the up 2069~21 incline thereof, an operation arm 2 is pivoted upward on a supporting shaft 16 as a fulcrum so that an up switch 17 is turned on by the operation arm 2 on the upper face thereof, thus starting operation of the drive shaft 9 to rotate the drive arm 1 on the side of the drag rod 3. Referring to Fig. 8, the operator continues to go on the up incline, and when a front wheel 7 of the transporter reaches the up incline, the upper face of the operation arm 2 is disengaged from the up switch 17 to turn off same. Accordingly, in case that the transporter is on the up incline, the operator is merely required to pull, within a period of time from turning-on of the up switch 17 to turning-off thereof, the transporter with the drag rod 3 at a speed that the center of gravity of the object 13 comes always above the axle 6.
On the other hand, referring to Fig. 9, when the operator passes from the flat of the ground surface to a down incline thereof, the operation arm 2 is pivoted downward on the supporting shaft 16 as a fulcrum so that an down switch 18 is turned on by the operation arm 2 on the lower face thereof, thus starting operation of the drive shaft 9 to rotate the drive arm 1 on the side of a rear wheel 8. Referring to Fig.
10, the operator continues to go on the down incline, and when the front wheel 7 of the transporter reaches the down incline, the down face of the operation arm 2 is disengaged from the down switch 18 to turn off same. Accordingly, in case that the transporter is on the down incline, the operator is merely required to pull, within this period of time, the transporter with the drag rod 3 at a speed that the center of gravity of the object 13 comes always above the axle 6.
If a stop position of the drive shaft 9, i.e., a position of the center of gravity of the obJect 13, is not optimal when the up switch 17 or the down switch 18 is turned off, the position of the drive arm 1 can 2~69821 be adjusted fine, if necessary, by switching operation mode to manual mode.
When putting down the object 13 on the ground after its transport to the predetermined place, the drive arm 1 is rotated on the side of the rear wheel 8 in manual mode.
Having described an embodiment with reference to the drawings, it is to be noted that the present invention is not limited thereto, but various modifications may be made therein without departing from the scope of the claims. By way of example, the following modifications or the combination thereof are possible.
First, the drive mechanism for operating the drive arm 9 may be of the combination of an electric motor and a mechanical device, and include a pneumatic cylinder.
Secondly, when the drive mechanism uses electric power, a power source may be of a charging type battery or a small-sized generator, or of a power supply for domestic use by providing a power cord.
Thirdly, different lifting members such as lever type vacuum suction cup, etc. can be used in place of the hook 12.
Fourthly, a sensor control system can be added to correctly recognize the amplitude of variation of the inclination angle of the ground surface 15 during transport, and accurately indicate and control the amplitude of movement of the drive arm 1 relative to the above amplitude of variation.
Fifthly, referring to Fig. 5, if the transporter is designed and constructed to have a form enabling a larger angle formed by the operation arm 2 and the ground surface 15, the center of gravity of the object 13 can be held always above the axle 6 in keeping always the rear wheel 8 apart from the ground surface 15 during transport.
Sixthly, in case that the ground surface 15 or a contact surface is flat as far as a predetermined point to which the object 13 has to be transported, and that the center of gravity of the object 13 is relatively stable, a rack may be mounted on the auxiliary arm 4 to carry the object 13, the lower face thereof being in contact with the rack during transport.
Seventhly, a reinforcing member can be added between the drive arm 1 and the auxiliary arm 4 for preventing torsion of the transporter, or a brake mechanism can be added for increasing the safety of work during movement of the transporter.
Eighthly, an extension mechanism can be added to the drive arm 1, the auxiliary arm 4 or the drag bar 3, or all thereof for further increase in the operativity of the transporter.
Ninthly, referring to Fig. 11, in case that the drive arm 1 is provided with an extension mechanism, if the two auxiliary arms 4 are integrally formed to be an U-shape, and the front wheel 7 is mounted within the auxiliary arm 4, and the axle 6 and the reinforcing plates 20, 21 are eliminated, the object 13 can be lifted up and down only by extension motion of the drive arm 1, resulting in more facile transport of heavy or long object.
Tenthly, referring to Fig. 12, the mounting position of the drive shaft 9 and the cylinder 10 can be changed to drive the drive arm 1 on the side of the drag arm 3.
Eleventhly, referring to Fig. 13, if the length of the auxiliary arm 4 is decreased in addition to the modification No. 10, transport work can be done without an end of the drive arm 4 being knocked against a wall when lifting up the obJect 13 located near the wall, or lifting down same near the wall.
Upon lifting-up or lifting-down of the object 13, for 206~821 minimizing a load applying to the operator by movement of the center of gravity of the object 13 with rotation of the drive arm 1, a support 22 as usually received or housed within the auxiliary arm 4 is drawn out temporarily therefrom so that one end thereof touches to the ground. If the drag bar 3 with extension mechanism is adopted, and the operator holds same in its extension state upon lifting-up or lifting-down of the object 13, the above load can be further decreased.
Lastly, the transporter may be provided with traction means such as an engine, etc. for automatic operation.
Claims (13)
1. A transporter for carrying relative to a horizontal ground surface an object having a center of gravity, comprising:
- first arm means for lifting the object, said first arm means having a longitudinal center line;
- second arm means, operatively connected to said first arm means at one end thereof, for supporting said first arm means;
- wheel means, rotatably mounted to said second arm means, for enabling movement of the transporter, said wheel means having an axis of rotation, said first arm means being disposed relative to said wheel means so that said longitudinal center line of said first arm means extends through said axis of said wheel means and a pivot point between said first and second arm means;
- drive means, interposed between said first and second arm means, for driving said first arm means;
- setting means, connected to said drive means, for initially setting said first arm means so that the center of gravity of the object is above said axis of said wheel means;
- sensor means connected to said second arm means for sensing a variation of an inclination angle of said second arm means relative to the horizontal ground surface; and - a microcomputer based control unit connected to said drive means, said setting means and said sensor means, said microcomputer based control unit controlling said drive means such that said drive means move said first arm means relative to said second arm means in response to said sensed variation of said inclination angle of said second arm means relative to the horizontal ground surface so as to maintain the center of gravity of the object above said axis of said wheel means regardless of said inclination angle of said second arm means relative to the horizontal ground surface.
- first arm means for lifting the object, said first arm means having a longitudinal center line;
- second arm means, operatively connected to said first arm means at one end thereof, for supporting said first arm means;
- wheel means, rotatably mounted to said second arm means, for enabling movement of the transporter, said wheel means having an axis of rotation, said first arm means being disposed relative to said wheel means so that said longitudinal center line of said first arm means extends through said axis of said wheel means and a pivot point between said first and second arm means;
- drive means, interposed between said first and second arm means, for driving said first arm means;
- setting means, connected to said drive means, for initially setting said first arm means so that the center of gravity of the object is above said axis of said wheel means;
- sensor means connected to said second arm means for sensing a variation of an inclination angle of said second arm means relative to the horizontal ground surface; and - a microcomputer based control unit connected to said drive means, said setting means and said sensor means, said microcomputer based control unit controlling said drive means such that said drive means move said first arm means relative to said second arm means in response to said sensed variation of said inclination angle of said second arm means relative to the horizontal ground surface so as to maintain the center of gravity of the object above said axis of said wheel means regardless of said inclination angle of said second arm means relative to the horizontal ground surface.
2. A transporter as claimed in claim 1, wherein said first arm means have one end disposed above said axis of said wheel means.
3. A transporter as claimed in claim 2, wherein said first arm means include a pair of drive arms.
4. A transporter as claimed in claim 1, wherein said second arm means include a pair of auxiliary arms.
5. A transporter as claimed in claim 1, wherein said drive means include a hydraulic pump with a motor, a pair of hydraulic cylinders, a pair of drive shafts slidably fitted therein, and a level switch.
6. A transporter as claimed in claim 1, wherein said sensor means include an up switch and a down switch.
7. A transporter as claimed in claim 5, wherein said drive means have one end connected to said first arm means, and the other end connected to said second arm means at the rear portion thereof with respect to a forward direction of the transporter.
8. A transporter as claimed in claim 5, wherein said drive means have one end connected to said first arm means, and the other end connected to said second arm means at the front portion thereof with respect to said forward direction of the transporter.
9. A transporter as claimed in claim 3, wherein said first arm means include an extension mechanism.
10. A transporter as claimed in claim 1, wherein said second arm means include an U-shaped auxiliary arm.
11 11. A transporter as claimed in claim 10, wherein said second arm means include a pair of supports.
12. A transporter as claimed in claim 1, wherein said drive means include a pneumatic cylinder.
13. A transporter as claimed in claim 1, wherein said sensor means include a sensor control system.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991071299U JPH04131574U (en) | 1991-05-29 | 1991-05-29 | Transport device with center of gravity maintenance and center of gravity movement functions |
| JPU1-71299 | 1991-05-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2069821A1 CA2069821A1 (en) | 1992-11-30 |
| CA2069821C true CA2069821C (en) | 1997-06-24 |
Family
ID=13456646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002069821A Expired - Fee Related CA2069821C (en) | 1991-05-29 | 1992-05-28 | Transporter with function of maintaining and moving center of gravity |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPH04131574U (en) |
| KR (1) | KR950003592B1 (en) |
| AU (1) | AU647625B2 (en) |
| CA (1) | CA2069821C (en) |
| GB (1) | GB2256173B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102501893B (en) * | 2011-11-12 | 2015-06-10 | 国网浙江龙游县供电公司 | Transporting tool capable of stably changing loading posture of transported object during transport process |
| CN103112802B (en) * | 2013-02-06 | 2015-09-30 | 南京沃力机电科技有限公司 | A kind of electrocar |
| CN105416349B (en) * | 2015-11-24 | 2016-11-30 | 国网山东无棣县供电公司 | A kind of device for transporting electric pole |
| CN108483306B (en) * | 2018-04-19 | 2024-01-16 | 五邑大学 | Transportation equipment based on rotation lifting |
| CN111115520A (en) * | 2019-12-30 | 2020-05-08 | 安徽安鑫货叉有限公司 | Angle-adjustable rotary fork |
| CN111391902B (en) * | 2020-03-19 | 2021-05-18 | 唐山曹妃甸实华原油码头有限公司 | Oil drum carrying device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5568467A (en) * | 1978-11-14 | 1980-05-23 | Eruta Kikai Kogyo Kk | Transportation vehicle |
| JPS6177563A (en) * | 1984-09-25 | 1986-04-21 | 財団法人鉄道総合技術研究所 | Wheelchair auxiliary truck for stair or ascending or descending of escalator |
| FR2624842B1 (en) * | 1987-12-18 | 1990-04-06 | Manitou Bf | IMPROVING THE STABILITY OF TELESCOPIC ARM LIFT TRUCKS |
| SE462624B (en) * | 1988-12-06 | 1990-07-30 | Vme Ind Sweden Ab | LOADING SYSTEM WITH LOADING MACHINES |
| US4964778A (en) * | 1989-07-27 | 1990-10-23 | Kidde Industries, Inc. | Forklift truck having a telescopic auxiliary boom articulated to a telescopic main boom |
-
1991
- 1991-05-29 JP JP1991071299U patent/JPH04131574U/en active Pending
-
1992
- 1992-05-28 GB GB9211332A patent/GB2256173B/en not_active Expired - Fee Related
- 1992-05-28 CA CA002069821A patent/CA2069821C/en not_active Expired - Fee Related
- 1992-05-29 AU AU17307/92A patent/AU647625B2/en not_active Ceased
- 1992-05-29 KR KR1019920009258A patent/KR950003592B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| GB2256173B (en) | 1995-02-15 |
| KR950003592B1 (en) | 1995-04-14 |
| AU1730792A (en) | 1992-12-03 |
| JPH04131574U (en) | 1992-12-03 |
| CA2069821A1 (en) | 1992-11-30 |
| KR920021386A (en) | 1992-12-18 |
| GB2256173A (en) | 1992-12-02 |
| GB9211332D0 (en) | 1992-07-15 |
| AU647625B2 (en) | 1994-03-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |