JP4195656B2 - Loading platform lifting device and its emergency lifting method - Google Patents

Description

  The present invention relates to a load receiving table lifting device mounted on a truck and used for loading and unloading loads.

  The load receiving platform lifting device is a device that lifts and lowers the load receiving platform by a lifting operation of a lifting arm driven by a lifting cylinder. For this purpose, one power unit for supplying hydraulic pressure for operating the lifting cylinder is mounted. Also, in fields other than cargo truck lifting devices, for example, as a lifting device for placing a wheelchair on a bus, a configuration including an auxiliary power unit in addition to the main power unit and switching to the auxiliary power unit when the main power unit fails is proposed. (For example, refer to Patent Document 1).

Japanese Utility Model Publication No. 6-35040 (first and second pages, FIG. 1)

However, in the case where there is one power unit, if this malfunctions, the lifting arm cannot be raised or lowered. In particular, if a failure occurs with the cargo cradle landed, the vehicle cannot be moved to a repair shop unless the lifting arm can be raised. On the other hand, the configuration including the auxiliary power unit is complicated and expensive to manufacture, and is not practical for a truck.
In view of the conventional problems as described above, the present invention has a simple and inexpensive configuration even when the lifting arm cannot be driven hydraulically with the load receiving platform of the load receiving platform lifting / lowering apparatus being landed. It is an object of the present invention to make it possible to raise the lifting arm by a simple method.

The load receiving platform lifting apparatus of the present invention is mounted so as to be rotatable around a lifting arm that is pivotally attached to a vehicle body, and a first pivot that is provided on a pivoting end side of the lifting arm. A load receiving table, an elevating cylinder that drives the elevating arm to move the load receiving table up and down, a rotation end of the lifting arm, and a base end portion of the load receiving table, When the load receiving platform is laid down from the standing posture in a state where the lifting arm is at the lower end, it is sandwiched between the base end and the floor surface and prevents rotation about the first rotation fulcrum. An emergency lifting member is provided that provides a second rotation fulcrum instead of the first rotation fulcrum and raises the first rotation fulcrum as an action point.
In the load receiving platform lifting apparatus configured as described above, when the lifting arm cannot be driven hydraulically with the load receiving platform landed, the base end and the floor surface are lowered when the load receiving platform is lowered from the standing posture. By providing an emergency lifting member that is sandwiched between the first rotation fulcrum and preventing the rotation about the first rotation fulcrum, the load receiving platform is rotated about the second rotation fulcrum. The first rotation fulcrum is raised as an action point. This raises the lifting arm. Therefore, even when the lifting arm cannot be driven hydraulically, the lifting arm can be raised with a simple and inexpensive configuration.

Further, in the above-described load receiving platform lifting apparatus, the emergency lifting member may be detachable.
In this case, normally, the emergency lifting member is removed and stored, so that the normal lifting operation of the cargo tray is not hindered.

Moreover, in the said load receiving table raising / lowering apparatus, the emergency lifting member may be movable to an overhanging position that acts as the member and a storage position where the action as the member becomes invalid.
In this case, by moving the position of the emergency lifting member, it is convenient that it can be quickly and easily set to the retracted position in the normal state and the extended position in an emergency.

Moreover, the said load receiving table raising / lowering apparatus can also be equipped with the detachable fixing tool which fixes the raising / lowering arm raised by the emergency lifting member to the vehicle body side in the position.
In this case, the lifting arm can be easily fixed to the vehicle body side.

Further, in the load receiving table lifting device, the hydraulic circuit for controlling the supply and discharge of the hydraulic oil to and from the lifting cylinder is supplied to the lifting cylinder directly from the tank through the check valve by the negative pressure in the lifting cylinder. A reverse blocking bypass circuit that sucks up may be provided.
In this case, the work of fixing the lifting arm is unnecessary and convenient. In addition, the vehicle can be quickly moved to the repair shop.

On the other hand, the present invention is a lifting arm that is rotatably attached to the vehicle body, and a load receiving base that is rotatably attached around a turning fulcrum provided on the turning end side of the lifting arm, An emergency lift method for a load receiving and lifting device comprising a lifting cylinder for driving the lifting and lowering arm to lift and lower the load receiving platform, wherein (1) the load receiving stand is erected from the grounded state, (2 ) Insert a pedestal between the base end of the load receiving platform and the floor, (3) rotate the load receiving table in the lying down direction, the base end abuts the base, (4) By further rotating the load receiving table in the inclining direction with the contact portion with the pedestal as a fulcrum, the rotating fulcrum is raised as an action point, thereby raising the elevating arm, and (5) the raised elevating arm (6) Stand the load receiving stand upright at that position and It is characterized in that strapping.
In the above-mentioned emergency rising method, when the lifting arm cannot be driven hydraulically with the load receiving base on the ground, when the load receiving base is lowered from the standing posture, the base end and the floor surface are interposed. By inserting the pedestal, the rotation around the rotation fulcrum is prevented, and the load receiving table is rotated with the contact portion as a fulcrum, thereby raising the original rotation fulcrum as the action point by the lever principle. Therefore, even if the lifting arm cannot be driven hydraulically, the lifting arm can be raised by a simple method. In addition, the vehicle can be moved by fixing the raised elevator arm to the vehicle body side and tying the load receiving stand in an upright state.

Further, the present invention is a lifting arm that is rotatably attached to the vehicle body, and a load receiving base that is rotatably attached around a turning fulcrum provided on the turning end side of the lifting arm, An emergency lift method for a load receiving and lifting device comprising a lifting cylinder for driving the lifting and lowering arm to lift and lower the load receiving platform, wherein (1) the load receiving stand is erected from the grounded state, (2 ) An emergency lifting member is interposed between the base end portion of the cargo cradle and the floor surface, and (3) the emergency lifting member is turned to the floor surface by the base end portion by rotating the cargo cradle in the lying down direction. (4) The contact point between the emergency lifting member and the floor surface is used as a fulcrum, and the load receiving table is further rotated in the lying down direction to raise the rotation fulcrum as an action point, thereby (5) The raised lifting arm at that position Fixed to body side, (6) the is erected the receiving platform, is characterized in that lashing to the vehicle body at that location.
In the above emergency ascent method, when the lifting arm cannot be driven with hydraulic pressure when the load receiving platform has landed, when the load receiving platform is lowered from the standing position, it is between the base end and the floor surface. By interposing the lifting member, rotation around the pivot point of the load cradle is prevented, and by rotating the load cradle with the contact point between the lifting member and the floor as the fulcrum, the principle of rotation can be achieved. Raise the dynamic fulcrum as the action point. Therefore, even if the lifting arm cannot be driven hydraulically, the lifting arm can be raised by a simple method. In addition, the vehicle can be moved by fixing the raised elevator arm to the vehicle body side and tying the load receiving stand in an upright state.

  According to the load receiving device lifting apparatus or the emergency raising method of the present invention, when the lifting arm cannot be driven with hydraulic pressure while the load receiving device is landed, the base end is lowered when the load receiving device is lowered from the standing posture. By providing an emergency lifting member that is sandwiched between the floor and the floor or inserting a pedestal, the principle pivot point of the load receiving platform can be raised by the lever principle as an action point, The lifting arm can be raised. Therefore, even when the lifting arm cannot be driven hydraulically, the lifting arm can be raised with a simple and inexpensive configuration or simply.

  Examples 1 to 7 of the present invention will be described below with reference to the drawings.

1 is a rear view of a load receiving table lifting apparatus according to a first embodiment of the present invention. First, the basic structure of the load receiving table lifting device will be described.
In FIG. 1, a van-shaped cargo box 2 is mounted on a body 1 of the truck. The cargo box 2 has a flat floor surface 2a, and a double door (double door) door 2b provided at the rear is opened to load and unload the cargo. Each door 2b is provided with a lock bar 2c that can be operated by a take-off operation (not shown).

  The load receiving table lifting / lowering device 3 is provided compactly in the right half of the load box 2 close to the right door side, and the width Wo of the load receiving stand 301 is about ½ of the width W of the load box. This load receiving table lifting / lowering device 3 is a type in which the load receiving stand 301 is vertically stowed and stored, and when used, the load receiving stand 301 is deployed horizontally (at this time, the handle 301c is gripped), and an arm, a cylinder, etc. described later are used. It is moved up and down by the lifting device 300. The door 2b on the left side can be opened and closed while the cargo receiving stand 301 is stored. A step 4 is attached to the lower left side of the packing box 2, and can be used as a stepping platform by an operator during loading and unloading work.

  Next, with reference to FIG. 2, a detailed description will be given of a unit in which the load receiving platform lifting device 3 (load receiving stand 301 is omitted) and step 4 are attached to a common support base. (A) is a plan view of the unit 100, and (b) is a rear view (viewed from the rear of the vehicle body). In the unit 100, the load receiving platform elevating device 3 is attached to the right side of the square pipe frame 302 serving as a common support base, the pair of step stays 6 is welded to the left side, and the step 4 is attached to the rear end thereof. ing. The step stay 6 is integrated with the frame 302 by welding and is also a part of the support base. The unit 100 is mounted on the chassis frame 1a of the vehicle body by a pair of left and right mounting brackets 8 and 9 provided directly or indirectly on the frame 302.

  FIG. 3 is a side view of the load receiving platform elevating device 3 (load receiving block 301 is also indicated by a virtual line) as viewed from the direction of arrow III in FIG. 2, that is, from the starboard side. FIG. 4 is a perspective view of the lifting apparatus 300 (partially omitted) as viewed from the port side. In FIG. 4 (see also FIG. 2 and FIG. 3), a lower arm 305 is rotatably attached to a pair of left and right support portions 303 welded to the frame 302 via pins 304, respectively. A support link 307 is attached to the support portion 306 welded to the frame 302, and an upper arm 309 is rotatably attached to the support link 307 via a pin 308. The support link 307 is provided to enable the cargo receiving table 301 to be tilted.

  The upper arm 309 includes a pair of side plates 310 that are separated from each other by a predetermined distance in the vehicle width direction, a reinforcing portion 311 that connects the tip ends thereof, a connecting pipe 312 that is fixed to the reinforcing portion 311 and the side plate 310, and a connection between them. An arm tip 313 fixed to both the left and right ends of the pipe 312 and a stopper mounting plate 314 fixed between the side plates 310 are provided, and these are integrally fixed (welded or the like) so as to be substantially single as a whole. It constitutes an integral body.

  Each side plate 310 is welded such that a short cylindrical boss 310a is embedded therein, and a pin 321 is inserted between the bosses 310a. An elevating cylinder 322 for elevating the load receiving table 301 is disposed by effectively using the space between the pair of side plates 310, and one end (piston side) of the elevating cylinder 322 is pivotally attached to the side plate 310 by a pin 321. The other end (cylinder side) of the elevating cylinder 322 is pivotally attached to the support link 307. Each arm tip 313 is formed with a hole 313a for inserting a pin 315 described later.

  In FIG. 3, the left and right pivot ends of the upper arm 309 are connected to one end of a link body 316 via a pin 315. Further, the rotating end of the lower arm 305 is connected to the other end of the link body 316 via a pin 317. The quadrilateral connecting the four points of the pins 304, 308, 315, and 317 is a parallelogram, whereby the pair of left and right lower arms 305 and the single upper arm 309 have the pins 304 and 308 on the left and right respectively. A parallel link having a fulcrum and pins 317 and 315 as action points is formed. The load receiving platform 301 is pivotally mounted between a vertically stored state and a horizontally deployed state while being supported by the link body 316 with the pin 315 as a rotation center.

  FIG. 5 is a side view of the load receiving platform 301 as seen from the starboard side in a state where the cargo receiving platform 301 is horizontally deployed. After the load receiving stand 301 stored vertically is horizontally expanded (manually) in this way, the door 2b is opened. Thereafter, by retracting the elevating cylinder 322, the upper arm 309 and the lower arm 305 can be rotated downward, and the load receiving table 301 can be lowered. Further, by extending the elevating cylinder 322, the upper arm 309 and the lower arm 305 can be rotated upward, and the load receiving table 301 can be raised. In this way, it is possible to load and unload luggage while raising and lowering the load receiving table 301. Further, when the lifting cylinder 322 (FIG. 4) is further contracted after the tip of the lower arm 305 or the link body 316 has landed, the position of the pin 308 (FIG. 3) is caused by the action of the support link 307 (FIG. 3). Is slightly moved rearward, and the cargo receiving platform 301 can be tilted.

2 and 3, a stopper bolt 318 is attached to the stopper mounting plate 314 of the upper arm 309, and this abuts on the support portion 306 when the upper arm 309 is lifted. That is, the stopper bolt 318 and the support portion 306 constitute a stopper device for the upward movement of the upper arm 309. Further, by adjusting the protruding length of the stopper bolt 318, it is possible to adjust the position where the upward movement of the upper arm 309 is stopped. Note that if the upper arm 309 is lifted, the lower arm 305 is also lifted.
A plate 319 is attached to each lower arm 305, and a reinforcing member (pipe) 320 is horizontally attached between the left and right plates 319.

  FIG. 29A is a hydraulic circuit diagram for driving the elevating cylinder 322. The elevating cylinder 322 is connected to the power unit 500 via an electromagnetic valve 510 with a check valve. The power unit 500 is configured by connecting a tank 501, a pump 502, a relief valve 503, an electromagnetic valve 504 with a check valve, a throttle valve 505, a check valve 506, and filters 507 and 508 as illustrated. (B) is a table | surface which shows how the pump 502 and the solenoid valves 504 and 510 operate | move at the time of raising / lowering operation | movement of the raising / lowering cylinder 322. FIG. At the time of ascent, the pump 502 is operated and both the solenoid valves 504 and 510 are in a non-excited state. Accordingly, the hydraulic oil sent out from the pump 502 passes through the check valve 506 and the check valve in the electromagnetic valve 510 to extend the lifting cylinder 322 and raise the load receiving table 301. On the other hand, at the time of lowering, the operation of the pump 502 is stopped and both the solenoid valves 504 and 510 are excited. As a result, the hydraulic oil in the elevating cylinder 322 is returned from the electromagnetic valve 510 to the tank 501 through the filter 508, the electromagnetic valve 504, and the throttle valve 505.

  Next, in the load receiving table lifting apparatus configured as described above, as shown in FIG. 6, the lifting arm A (which is a general term for the upper arm 309 and the lower arm 305) comes to the lower end and the load receiving table 301 is moved. It is assumed that the power unit 500 breaks down and the hydraulic pressure can no longer be used in the landing state. In this case, it is difficult to lift the lifting arm A directly by hand. Therefore, first, the load receiving table 301 is erected, and the base 11 is inserted between the base end portion 301b of the stiffener 301a on the back surface of the load receiving table 301 and the floor surface F as shown in FIG. As the pedestal 11, a material that is hard enough not to damage the base end portion 301b and easy to adjust the height is suitable. For this reason, for example, a plurality of (four in the illustrated example) wooden bars stacked in a balanced manner are used.

  Next, when the load receiving table 301 is rotated in the lying down direction, the base end portion 301 b comes into contact with the base 11. Thereby, even if it tries to rotate further in the lying down direction, the rotation using the pin 315 as the rotation fulcrum is prevented by the pedestal 11, and instead, the contact point P between the base end portion 301b and the pedestal 11 is the rotation fulcrum. Thus, the pin 315 is pushed up as an action point. Thereby, the raising / lowering arm A raises. At this time, the distance from the contact point P to the tip of the load receiving table 301 is sufficiently longer than the distance from the contact point P to the pin 315 of the action point. The lifting arm A can be lifted by pushing down with. The contact point P moves slightly backward due to the raising of the lifting arm A, and as shown in FIG. 8, the square member of the pedestal 11 is tilted backward, but does not collapse, and the lifting arm A is maintained in the raised state. can do.

  Here, the ascending / descending arm A is fixed to the vehicle body side in the posture. For example, a fixing tool 12 shown in FIG. 9A is used for fixing. This fixing tool 12 has a hole 12a formed at one end of an elongated steel plate and the other end bent into a hook shape to form a locking portion 12b. As shown in FIG. 9B, the locking portion 12b Is hooked on the stopper mounting plate 314, and the fixing pin 13 is attached to the hole 12a to be attached to the bodywork bracket 9. Thereby, the raising / lowering arm A is fixed to the vehicle body side in the position. After the elevating arm A is fixed, as shown in FIG. 10, the load receiving table 301 is erected and leaned against the door 2b. In this state, the tip of the lifting arm A and the link body 316 are separated from the floor surface F. The pedestal 11 has been removed. Subsequently, as shown in FIG. 11, the load receiving base 301 is secured to the vehicle body side through the rope 14 through the rope 301 and the cargo receiving base 301 is secured to the vehicle body side. In this way, the vehicle can be moved to the repair shop in a state where the lifting arm A is lifted from the floor surface F and the load receiving table 301 is secured to the vehicle body side. Such an emergency raising method can be carried out only by preparing the base 11 in addition to the fixture 12, and can be carried out easily in a short time.

In addition, although the receiving stand 301 in the said Example is a thing of the half width type approached to the right side seeing from the vehicle rear part, even if it is a half width type approached to the left side, or a full width (width substantially the same as a vehicle width) type A similar emergency climbing method can be applied.
Moreover, the form of the fixture 12 is only an example, and any form may be used as long as the lifting arm A can be fixed to the vehicle body side. Further, the hooking position of the fixture 12 may be the side plate 310 (FIG. 4) of the upper arm 309 or the lower arm 305 in addition to the stopper mounting plate 314.
In addition, the upper arm 309 of the above embodiment is substantially a single body, but may have a configuration in which left and right upper arms are connected in the vehicle width direction.

  FIG. 12 is a perspective view of the cargo receiving platform lifting apparatus according to the second embodiment as viewed from the rear port side. The original basic structure as the load receiving platform lifting apparatus is the same as that of the first embodiment, and the description thereof is omitted here. In the second embodiment, an emergency lifting member (hereinafter referred to as a lifting member) 15 is detachably provided on the left link body 316 as viewed from the rear. FIG. 13 is an enlarged view of a circled portion of FIG. In FIG. 13, the substantially V-shaped lifting member 15 has a wide roller support portion 15a and a narrow contact portion 15b, and a roller 15c is rotatably attached to the tip of the roller support portion 15a. Yes. The lifting member 15 is attached to be rotatable about the pin 16. The pin 16 is passed through the lifting member 15 through a pair of left and right holes 316a (see FIG. 3) formed in the link body 316. If the pin 16 is removed, the lifting member 15 can be easily removed. Normally, the lifting member 15 is not mounted and is stored in the vehicle together with the pins 16.

  When the lifting arm A comes to the lower end and the load receiving table 301 is landed, when the power unit 500 breaks down and the hydraulic pressure cannot be used, the load receiving table 301 is raised and the lifting member 15 is attached to the link body 316. Installing. FIG. 14 is a side view of this state, and the tip of the lifting arm A and the roller 15c of the lifting member 15 are grounded. There is a slight gap between the base end portion 301b of the load receiving platform 301 and the contact portion 15b. Next, when the load receiving platform 301 is slightly rotated in the lying down direction, the base end portion 301b comes into contact with the contact portion 15b as shown in FIG. In addition, (b) is an XV arrow enlarged view in (a). Therefore, after that, the rotation around the pin 315 is prevented, and when the load receiving table 301 is further rotated in the lying down direction, the contact point P between the roller 15c and the floor surface F is replaced with the load receiving table instead of the pin 315. The pin 315 is pushed up as an action point.

  Thereby, as shown in FIG. 16, the raising / lowering arm A raises. At this time, the distance from the contact point P to the tip of the load receiving table 301 is sufficiently longer than the distance from the contact point P to the pin 315 at the point of action. Thus, the lifting arm A can be raised. The contact point P is moved by rotating the load receiving table 301 in the inclining direction. This movement is smoothly performed by the rotatable roller 15c. Accordingly, the lifting arm A can be raised in a stable state at all times. The raised lifting arm A is fixed to the vehicle body side using the fixture 12 as in the first embodiment (see FIG. 9B). Finally, as shown in FIG. 17, the cargo receiving stand 301 is erected and secured to the vehicle body side in the same manner as in the first embodiment (see FIG. 11). In this way, the vehicle can be moved to the repair shop in a state where the lifting arm A is lifted from the floor surface F and the load receiving table 301 is secured to the vehicle body side. After lashing, the used lifting member 15 is removed and stored in the vehicle. Accordingly, the normal lifting operation of the cargo receiver is not hindered.

  FIG. 18 is a perspective view of the cargo receiving platform lifting apparatus according to the third embodiment as viewed from the rear port side. The original basic structure as the load receiving platform lifting apparatus is the same as that of the first embodiment, and the description thereof is omitted here. In the third embodiment, an emergency lifting member (hereinafter referred to as a lifting member) 17 that can be switched between a storage position and an overhanging position is provided on the left base end portion 301b of the cargo receiving platform 301 as viewed from the rear. It is. FIG. 19A is an enlarged view of a portion surrounded by a circle in FIG. In FIG. 19A, the flat plate-like lifting member 17 is pivotally attached to the stay 18 fixed to the base end portion 301b by a pin 19. There is another pin 20 in the middle of the lifting member 17, and this pin 20 passes through the lifting member 17 and is inserted into the stay 18. The pin 19 is fixed, but the pin 20 is detachable. A roller 17 a is rotatably attached to the tip of the lifting member 17.

  FIG. 19B is a diagram showing the positional relationship between the stay 18 and the lifting member 17. The stay 18 has two holes 18 a and 18 b through which the pins 20 are inserted. The stay 18 can be fixed at two positions by moving the pin 20 to one of the holes. When it is fixed to the hole 18a, it is the storing position of the lifting member 17, and when it is fixed to the hole 18b, it is the overhanging position. Normally, the lifting member 17 is fixed at the retracted position. At this position, the action as a “lifting member” described below is invalid, and the normal lifting operation of the load receiving table lifting device is not hindered.

  When the lifting arm A comes to the lower end and the load receiving platform 301 has landed, if the power unit 500 breaks down and hydraulic pressure becomes unusable, the load receiving platform 301 is first raised as shown in FIG. The member 17 is changed from the retracted position to the overhanging position (see FIG. 21). Next, when the cargo receiving platform 301 is rotated in the lying down direction, the rollers 17a land on the floor surface F as shown in FIG. Therefore, thereafter, the rotation around the pin 315 is prevented, and when the load receiving table 301 is further rotated in the lying down direction, the contact point P between the roller 17a and the floor surface F is replaced with the load receiving table instead of the pin 315. The pin 315 is pushed up as an action point.

  Thereby, as shown in FIG. 23, the raising / lowering arm A raises. At this time, since the distance from the contact P to the tip of the load receiving table 301 is sufficiently longer than the distance from the contact P to the pin 315 of the point of action, the tip of the load receiving table 301 is pushed down with a light force based on the lever principle. Thus, the lifting arm A can be raised. The contact point P is moved by rotating the load receiving table 301 in the inclining direction. This movement is smoothly performed by the rotatable roller 17a. Accordingly, the lifting arm A can be raised in a stable state at all times. The raised lifting arm A is fixed to the vehicle body side using the fixture 12 as in the first embodiment (see FIG. 9B). Finally, as shown in FIG. 24, the cargo receiving stand 301 is raised and secured to the vehicle body side in the same manner as in the first embodiment (see FIG. 11). In addition, after the lashing, the lifting member 17 is replaced with the storage position. In this way, the vehicle can be moved to the repair shop in a state where the lifting arm A is lifted from the floor surface F and the load receiving table 301 is secured to the vehicle body side. In the third embodiment, since it is possible to cope with the normal lifting state of the cargo receiver and the rising state of the emergency by simply replacing the lifting member 17, it is convenient.

  In the above-described embodiment, the lifting member 17 is rotated and the pin 20 is replaced to select one of the two positions. However, the lifting member 17 is normally in the retracted position using a spring, for example. When urging and performing an emergency rise, the configuration may be such that the lifting member 17 is pulled out and locked against the urging force of the spring.

  FIG. 25 is a perspective view of the load receiving platform lifting apparatus according to the fourth embodiment as viewed from the rear starboard side. However, illustration of the parts not necessary for the description such as the cargo receiving table 301 is omitted. The original basic structure as the load receiving platform lifting apparatus is the same as that of the first embodiment, and the description thereof is omitted here. Further, the fourth embodiment employs a configuration different from that of the first embodiment in fixing the lifting arm A raised in an emergency due to a power unit failure to the vehicle body side, and a method of raising the lifting arm A in an emergency. Alternatively, the configurations of Embodiments 1 to 3 are applied (the same applies to the following Embodiments 5, 6, and 7). In the fourth embodiment, the upper arm 309 is fixed to the vehicle body side using the lock pin 21.

  FIG. 26 is an enlarged view of a circled portion of FIG. In FIG. 26, a plate-like locking member 22 is welded to the chassis frame 1a. The locking member 22 has a hole 22a. On the other hand, a hole 314 a is formed on the side surface of the stopper mounting plate 314. These holes 22a and 314a are located at positions where the holes 22a and 314a are aligned in a straight line in the vehicle width direction when the elevating arm A is raised to a predetermined position by the method and configuration described in the second and third embodiments, for example. Is provided. Therefore, the lifting arm A can be fixed to the vehicle body side by inserting the lock pin 21 and fixing the stopper mounting plate 314 and the locking member 22 to each other. After fixing in this way, the cargo receiving stand 301 is erected and secured to the vehicle body side in the same manner as in the first embodiment (see FIG. 11).

  The fifth embodiment proposes another member in place of the fixture 12 in the first embodiment. FIG. 27 shows a turnbuckle 23 used in place of the fixture 12. The turnbuckle 23 is formed by screwing hooks 23b with screws at both ends of the main body 23a. The length L can be adjusted by inserting the operating rod 24 through the main body 23a and turning it. Therefore, similarly to the fixture 12 of the first embodiment (see FIG. 9B), one hook 23b is fixed to the mounting bracket 9 with the fixing pin 13, and the other hook 23b is hooked to the stopper mounting plate 314. If the length is adjusted, the lifting arm A can be fixed to the vehicle body at that position. Since the length L is adjustable, it can be used in common even when the distance from the fixing pin 13 to the stopper mounting plate 314 varies depending on the vehicle height, which is more convenient than the fixture 12 of the first embodiment. .

  In the sixth embodiment, an ultra-small chain block 25 is used instead of the turnbuckle 23 of the fifth embodiment. In this chain block 25, the chain 25a can be made free or can be wound in one direction, and the fixed lever 25c and the movable hook can be moved by reciprocatingly rotating the operation lever 25b in the one direction winding state. The distance L between 25d can be shortened. Therefore, similarly to the fixture 12 of the first embodiment (see FIG. 9B), the fixed side hook 25c is fixed to the bodywork bracket 9 with the fixing pin 13, and the movable side hook 25d is hooked to the stopper mounting plate 314. If the length is adjusted, the lifting arm A can be fixed to the vehicle body at that position. Similar to the fifth embodiment, since the length L is adjustable, it can be used in common even when the distance from the fixing pin 13 to the stopper mounting plate 314 varies depending on the vehicle height.

  In the seventh embodiment, the lifting arm A is fixed regardless of the tool such as the fixing tool 12 in the first embodiment. FIG. 30 is a hydraulic circuit diagram according to the seventh embodiment for driving the elevating cylinder 322. The description of the parts common to FIG. 29 will be omitted, and only the different parts will be described. This hydraulic circuit is a reverse blocking bypass in which only the check valve 509 is interposed between the output port 500p of the power unit 500 and the tank 501. A circuit B is provided. When the elevating arm A is raised in an emergency by any of the methods and configurations of the first to third embodiments, the piston 322a of the elevating cylinder 322 in FIG. 31 is pulled out with a negative pressure inside the cylinder. As a result, the check valve in the electromagnetic valve 510 and the check valve 509 of the reverse blocking bypass circuit B are opened, and the hydraulic oil is sucked up from the tank 501 directly into the lift cylinder 322 via the check valve 509. After the ascent stop, the return of hydraulic oil is blocked by the check valve in the electromagnetic valve 510 and the check valves 506, 504, and 509 in the power unit 500, and the piston 322a does not contract. Thus, the lifting arm A is held at the emergency lift position. In the seventh embodiment, the work of fixing the lifting arm A is unnecessary and convenient. In addition, the vehicle can be quickly moved to the repair shop.

It is a rear view of the load receiving table raising / lowering device by Example 1 of this invention. It is the top view and back view which show units, such as a cargo receiving stand raising / lowering apparatus. FIG. 3 is a side view of the load receiving platform lifting device (load receiving block is also indicated by a virtual line) as viewed from the direction of arrow III in FIG. 2, that is, from the starboard side. It is a perspective view of the raising / lowering device (however, illustration of one part is abbreviate | omitted) seen from the port side. It is the side view which looked at the state which unfolded the receiving stand from the starboard side. In Example 1, it is a side view of the state which landed the receiving stand. It is a side view which shows the state which stood the load receiving stand from the state of FIG. 6, and inserted the base between the base end part and the floor surface. It is a side view which shows the state which rotated the load receiving stand from the state of FIG. 7, and raised the raising / lowering arm. It is the figure which shows the fixing tool in Example 1, and the side view which shows the state which fixed the raising / lowering arm raised very much using this. It is a side view which shows the state which raised and raised the raising / lowering arm, was fixed, and also stood the load receiving stand. FIG. 11 is a perspective view showing a state in which the load receiving stand is secured to the vehicle body side from the state of FIG. 10. In Example 2, it is a perspective view of the load receiving table raising / lowering apparatus equipped with the lifting member. It is an enlarged view of the part enclosed with the circle of FIG. FIG. 13 is a side view corresponding to FIG. 12. It is a side view which shows the state which rotated the load receiving stand from the state of FIG. 14 in the lying down direction, and the base end part of the load receiving contact contacted the lifting member. FIG. 16 is a side view showing a state in which the load receiving platform is further rotated in the lying down direction from the state of FIG. 15 and the elevating arm is raised. It is a side view which shows the state which fixed the raising / lowering arm from the state of FIG. 16, and also stood the load receiving stand. In Example 3, it is a perspective view of the load receiving table raising / lowering apparatus with a lifting member. It is an enlarged view of the part enclosed with the circle of FIG. It is a side view which shows the state which stood up the load receiving stand from the landed state, and the raising member exists in a retracted position. It is a side view which shows the state which moved the lifting member to the overhanging position from the state of FIG. It is a side view which shows the state which rotated the load receiving stand from the state of FIG. 21, and the roller of the lifting member landed. It is a side view which shows the state which rotated the load receiving stand further from the state of FIG. 22, and raised the raising / lowering arm. It is a side view which shows the state which fixed the raising / lowering arm from the state of FIG. 23, and also raised the load receiving stand. It is the perspective view which looked at a part of load receiving table raising / lowering device by Example 4 from back. FIG. 26 is an enlarged view of a portion surrounded by a circle in FIG. 25. It is a figure which shows the turnbuckle in Example 5. FIG. It is a figure which shows the chain block in Example 6. FIG. 1 is a hydraulic circuit diagram for driving an elevating cylinder in Embodiment 1. FIG. FIG. 10 is a hydraulic circuit diagram for driving a lifting cylinder in a seventh embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Car body 3 Conveyance stand raising / lowering device 11 Base 12 Fixing tool 15,17 Lifting member (emergency lifting member)
301 Cargo stand 301b Base end 315 Pin (first rotation fulcrum)
322 Lift cylinder 501 Tank 509 Check valve A Lift arm (upper arm 309, lower arm 305)
B Reverse blocking bypass circuit F Floor surface P Contact point, contact point (second rotation fulcrum)

Claims (7)

A lifting arm attached to the vehicle body in a rotatable manner;
A load receiving base that is pivotally mounted around a first pivot point provided on the pivot end side of the lifting arm;
An elevating cylinder that drives the elevating arm to move the load receiving table up and down;
It is attached to any one of the vicinity of the pivot end of the lifting arm and the base end of the load receiving table, and when the load receiving table is lowered from the standing posture in a state where the lifting arm is at the lower end, The second rotation fulcrum is provided between the base end portion and the floor surface to prevent rotation about the first rotation fulcrum and to replace the first rotation fulcrum. An emergency lifting member that raises the moving fulcrum as an action point.   2. The load receiving platform elevating device according to claim 1, wherein the emergency lifting member is detachable.   The load receiving table lifting / lowering device according to claim 1, wherein the emergency lifting member is movable between an overhanging position that serves as the member and a storage position where the action as the member is invalid.   The load receiving platform elevating device according to claim 1, further comprising a detachable fixture that fixes the elevating arm raised by the emergency lifting member to the vehicle body side at that position.   The hydraulic circuit that controls the supply and discharge of hydraulic oil to and from the lifting cylinder is provided with a reverse blocking bypass circuit that draws hydraulic oil from the tank directly to the lifting cylinder through a check valve due to negative pressure in the lifting cylinder The load receiving table lifting device according to claim 1. A lifting arm that is pivotally attached to the vehicle body, a load receiving base that is pivotally mounted around a pivoting fulcrum provided on a pivoting end of the lifting arm, and drives the lifting arm. An emergency lift method for a load receiving and lifting device having a lifting cylinder for moving the load receiving and lowering,
Standing up from the state where the receiving platform has landed,
Insert a pedestal between the base end of the receiving platform and the floor,
Rotating the load receiving table in the lodging direction to bring the base end into contact with the pedestal;
Using the contact portion with the pedestal as a fulcrum, further raising the pivot fulcrum as an action point by rotating the load receiving table in the lying down direction, thereby raising the lifting arm,
Fix the raised arm to the vehicle body side at that position,
An emergency ascent method for a load receiving platform lifting apparatus, wherein the load receiving stand is erected and secured to the vehicle body at that position. A lifting arm that is pivotally attached to the vehicle body, a load receiving base that is pivotally mounted around a pivoting fulcrum provided on a pivoting end of the lifting arm, and drives the lifting arm. An emergency lift method for a load receiving and lifting device having a lifting cylinder for moving the load receiving and lowering,
Standing up from the state where the receiving platform has landed,
An emergency lifting member is interposed between the base end of the load receiving platform and the floor surface,
Rotate the load receiving table in the lying down direction and press the emergency lifting member against the floor surface by the base end portion,
Using the contact point between the emergency lifting member and the floor as a fulcrum, further raising the load fulcrum by turning the load receiving table in the lying down direction, thereby raising the lifting arm,
Fix the raised arm to the vehicle body side at that position,
An emergency ascent method for a load receiving platform lifting apparatus, wherein the load receiving stand is erected and secured to the vehicle body at that position.

Images