JP2011079638A - Lifting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lifting device including a stopper mechanism for locking a carriage on a ramp without the operation of a worker to solve such a problem that the carriage may fall down from the ramp if operation to raise the stopper while the carriage is on the ramp is forgotten since a worker must carry out all operations to fold the stopper before placing the carriage on the ramp and taking it down, and to raise the stopper while the carriage is on the ramp in a conventional stopper mechanism. <P>SOLUTION: The lifting device includes a weight 45 that positions a stopper 41 at a front side of one of wheels 101 at the depth side to hold the other wheel 101 in a lock state not to move forward, and abuts on the ground side with the ramp 3 lowered to the lowering end position to rock the stopper 41, bringing it into a lock release state. Besides, the weight 45 is formed into a disk shape to get over rugged parts at the ground side. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lifting device that lifts and lowers a carriage with a carriage provided with wheels.

  For example, in an assembly factory, parts in the middle of assembly may be stored in a container box, and the container box may be mounted in a plurality of stages on a cart equipped with wheels and moved in the factory. Then, when the container box is transported to the place where the next assembly process work is performed in a state where it is mounted on the carriage, the parts in the container box are taken out one by one and the assembly work is performed.

  For example, when parts are sequentially taken out from the uppermost container box and the assembly process work is performed, the uppermost container box becomes empty. Then, the empty container box is removed and the parts are taken out from the second-stage container box. As described above, when the container box is sequentially removed from the upper stage as the operation progresses, the height of the container box that performs the removal operation decreases. Conversely, when storing parts assembled in an empty container box, the next empty container box is stacked on top of the container box when it is full. The height is getting higher.

  As described above, when a plurality of container boxes are used in an overlapping manner, the height of the container box changes with the progress of the work, which may force the worker to take an unreasonable posture. Therefore, the container box mounted on the carriage is placed on the lifting platform, and the lifting platform is moved up and down every time the number of loading stages of the container box changes. Storage work is made possible.

  In this way, since the carriage with wheels is placed on the lifting platform, it is necessary to provide a stopper on the lifting platform side so that the carriage does not move and fall from the lifting platform while the lifting platform is raised.

  As a stopper mechanism to prevent the carriage on such a platform from falling down, for example, when a plate-like stopper similar to a car stop that rises diagonally is provided on the platform, when placing the carriage on the platform It is known that the stopper is folded up so that it is flush with the upper surface of the elevator, and when the carriage is placed, the stopper is raised so that the wheel abuts the stopper and the carriage does not fall from the elevator (For example, refer to Patent Document 1).

Japanese Patent Laying-Open No. 2004-90876 (paragraphs 0025 and 0026, FIG. 1)

  In the above-described conventional stopper mechanism, an operator must perform all operations of retracting the stopper when the carriage is placed on or lowered, and raising the stopper while the carriage is on the elevator. For this reason, for example, if the operation of raising the stopper with the carriage placed on the lifting platform is forgotten, the carriage may fall from the lifting platform. And in order to avoid such a fear of falling, it must be relied only on that an operator raises a stopper reliably, and it cannot be said that it has sufficient reliability.

  Then, this invention makes it a subject to provide the raising / lowering apparatus provided with the stopper mechanism which can be locked with respect to the trolley | bogie on a raising / lowering stand even if it does not depend on an operator's operation in view of said problem.

  In order to solve the above-described problems, the lifting device according to the present invention is a lifting device that includes a stopper that prevents the cart from dropping off the lifting platform that is lifted and lowered with a cart equipped with four wheels. An enclosure drop-out prevention device that prevents a truck wheel from falling on the back and both sides of the lifting platform by allowing the carriage to get on and off the lifting platform from the front side of the lifting platform at the lower end position. A lock that allows a movement to the front side and a locked state that prevents the one wheel from moving to the front side by positioning the stopper portion on the front side of one of the rear wheels. It is provided so as to be able to swing between the released state, and the stopper portion is held in a locked state by gravity, and the stopper portion is swung by contacting the ground side with the lifting platform lowered to the lower end position. Part Characterized in that a disc-shaped weights to unlocked state.

  When the elevator platform is lowered to the lower end position, the weight comes into contact with the ground and the stopper is automatically unlocked. Further, when the lifting platform is raised, the weight is separated from the ground side, and the stopper portion is swung by the weight of the weight to be locked. In this way, the stopper portion is automatically switched between the locked state and the unlocked state in conjunction with the lifting and lowering of the lifting platform. The weight contacts the ground side immediately before the lifting platform is lowered to the lower end position. The weight moves on the upper surface on the ground side while the lifting platform is further lowered from the ground contact start state. At that time, if there is unevenness on the ground side, the weight may be caught by the unevenness. Therefore, the weight is formed in a disk shape so that the weight can get over and move without being caught by the unevenness on the ground side.

  In addition, if the said disk-shaped weight is attached rotatably, a frictional force can be reduced when a weight moves in contact with the ground side.

  Further, when the stopper portion is in a locked state, a movement prohibiting portion that prohibits movement of the wheel in a direction away from the side drop-off prevention portion with the wheel locked by the side drop-off prevention portion interposed therebetween. You may form in a stopper part.

  As is clear from the above description, the present invention can automatically switch the stopper portion between the locked state and the unlocked state, and the weight can be caught by the unevenness even if there is unevenness on the ground side. Absent.

The figure which shows the structure of one embodiment of this invention Enlarged view of the stopper The figure which shows the state where the cart is locked The figure which shows the state where the turning wheel is locked The figure which shows the state put on the platform with the front and back of the carriage reversed The figure which shows the composition which uses the spring to assist the weight

  Referring to FIG. 1, reference numeral 1 denotes an elevating device according to the present invention, which comprises a base 2 fixed to a floor and an elevating table 3 connected to the base via a pantograph type elevating mechanism. Has been. The lifting mechanism is operated by hydraulic pressure fed by an electric pump (not shown), and the operator can freely raise and lower the lifting platform 3 by a foot switch (not shown), and at a desired height. 3 can be stopped. In a state where the lifting platform 3 is at the lower end position, the carriage 100 can be placed from the front side of the lifting platform 3, and the carriage 100 riding on the lifting platform 3 can be lowered.

  A fixed wheel 101 whose wheel rotation shaft does not rotate in the horizontal direction and a turning wheel 102 whose wheel rotation shaft rotates in the horizontal direction are attached to the carriage 100 one by one. And when putting the trolley | bogie 100 on the lifting platform 3, the trolley | bogie 100 is advanced so that the fixed wheel 101 may become the front.

  In this cart 100, container boxes CB for storing parts are stacked up and down. For example, when parts assembled in the assembly process are sequentially stored in the container box CB, one container box CB is placed on the cart 100, and the lifting platform 3 is raised to a position where it can be easily stored. When the container box CB is full, the elevator 3 is lowered by the height dimension of the container box CB, and a new empty container box CB is overlaid on the full container box CB. In this way, the container boxes CB are sequentially stacked up to a predetermined number of stages, and the elevator 3 is lowered each time the containers are stacked. When the container boxes CB are stacked up to a predetermined number of stages, the elevator 3 is lowered to the lower end, and the carriage 100 is pulled down from the elevator 3. In addition, when the parts before assembly are put in the container box CB, the carriage 100 on which the predetermined number of container boxes CB are placed is put on the lifting platform 3, and the parts before assembly are taken out from the uppermost container box CB, When empty, the container box CB may be removed, and the elevator 3 may be lifted by the height of the container box CB.

  By the way, in order to prevent the carriage 100 from falling from the lifting platform 3 with the lifting platform 3 raised, the rear wall 31 and the lateral wall 32 which are enclosure-like drop-off prevention portions on the back side and the left and right sides of the lifting platform 3. And are provided. Although the rear wall 31 and the lateral walls 32 on both sides can prevent falling in three directions, there is a risk of falling to the near side. Therefore, a stopper mechanism 4 is provided that prevents the carriage 100 from moving to the near side and falling from the elevator 3.

  Referring to FIG. 2, the stopper mechanism 4 includes a plate-like stopper portion 41, and a connecting portion 42 is integrally formed with the stopper portion 41. The intermediate portion of the connecting portion 42 is attached to the lifting platform 3 by a pivot 43. The connecting portion 42 is held so as to be swingable with respect to the pivot 43. A bracket 44 is fixed to the end portion of the connecting portion 42, and a weight 45 is rotatably attached to the vicinity of the lower end portion of the bracket by a rotating shaft 46.

  The weight 45 is formed in a disk shape, and as shown in the drawing, the stopper portion 41 is in a state of being flipped up by the weight of the weight 45 when the lifting platform 3 is raised. Therefore, if the fixed wheel 101 is located behind the stopper portion 41, the wheel of the fixed wheel 101 abuts against the stopper portion 41 even if the carriage 100 tries to move to the near side. It cannot move to the near side.

  Incidentally, as described above, the fixed wheels 101 are provided in a pair of left and right, but in the present invention, the stopper mechanism 4 is provided only for one of the fixed wheels 101. As shown in FIG. 3, when a force P that moves the carriage 100 toward the front side is applied, only the left fixed wheel 101 in the drawing abuts against the stopper portion 41. Then, the carriage 100 tries to rotate in the direction indicated by the arrow M instead of being transported straight forward. Then, the left turning wheel 102 comes into contact with the lateral wall 32 and the carriage 100 does not move any more. As a result, the cart 100 does not fall from the elevator 3.

  When the lifting platform 3 is lowered to the lower end position, the weight 45 contacts the floor surface slightly before the lower end position. When the elevator 3 is further lowered to the lower end position, the weight 45 lifts the end of the connecting portion 42 while rolling on the floor surface. Then, the stopper portion 41 formed on the opposite side of the connecting portion 42 is in a horizontal state so as to be in contact with the upper surface of the lifting platform 3. When the stopper portion 41 is completely in contact with the upper surface of the elevator 3, the fixed wheel 101 can ride on the stopper portion 41 and roll on the upper surface of the stopper portion 41 to move to the near side. Therefore, when the lifting platform 3 is lowered to the lower end position, the lock by the stopper portion 41 is released and the cart 100 can be pulled out to the near side. When the carriage 100 is put on the lifting platform 3 again, the fixed wheel 101 rolls over the upper surface of the stopper portion 41 and contacts the back wall 31. If the elevator 3 is raised in this state, the weight 45 is separated from the floor surface, the stopper portion 41 is raised, and the fixed wheel 101 is locked.

  Thus, when the connecting portion 42 swings and the stopper portion 41 moves up and down, the weight 45 comes into contact with the floor surface, and the contact point moves. As described above, the weight 45 is a rotating shaft. Since the weight 45 is rotatably held by 46, the weight 45 is rotated and no friction is generated between the weight 45 and the floor surface. If the weight 45 is disc-shaped, it can be overcome even if there are irregularities on the ground side, so it does not necessarily have to be held rotatably and may be fixed to the rotating shaft 46.

  As described above, when the carriage 100 is placed on the lifting platform 3, the carriage 100 is moved so that the fixed wheel 101 becomes the front wheel, but the carriage 100 is mistakenly moved to the lifting platform 3 with the turning wheel 102 being the front wheel. If it is placed, even if the turning wheel 102 comes into contact with the stopper portion 41, the turning wheel 102 turns and the turning wheel 102 may move so as to bypass the stopper portion 41.

  Therefore, as shown in FIGS. 4 and 5, an arm portion 41 a that is a movement prohibition portion may be integrally extended to the stopper portion 41. When the elevator unit 3 is raised and the stopper unit 41 is raised, the arm portion 41a sandwiches the fixed wheel 101 and the turning wheel 102 between the lateral wall 32 and the arm portion 41a. For example, even if the turning wheel 102 is in that position, The turning wheel 102 is prevented from moving away from the lateral wall 32.

  In addition, not only the turning wheel 102 but also the fixed wheel 101, in order to guide all the wheels to the position where they are securely locked, the vertical wall-shaped guide 41b is provided over the stopper portion 41 and the arm portion 41a. It was.

  Further, in the above embodiment, only the weight 45 is used to raise the stopper portion 41. However, the spring 48 is used as shown in FIG. The stopper 41 may be raised with assistance. In this case, it is desirable to attach the roller 47 to the lower end of the bracket 44.

  In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

DESCRIPTION OF SYMBOLS 1 Lifting apparatus 2 Base part 3 Lifting stand 4 Stopper mechanism 41 Stopper part 100 Bogie 101 Fixed wheel 102 Turning wheel CB Container box

Claims (3)

  A lifting device provided with a stopper that prevents the carriage from falling off the lifting platform on the lifting platform that is lifted and lowered with a carriage with four wheels on the front of the lifting platform at the lower end position An enclosure drop-off prevention part is installed to prevent the wheels of the carriage from falling off the lift platform on the back side and both sides of the lift platform. It is located on the front side of one wheel so that it can swing between a locked state that prevents the one wheel from moving toward the front side and an unlocked state that allows movement toward the front side. In addition to holding the stopper part in a locked state, a disc-shaped weight is provided that swings the stopper part by abutting against the ground side while the lifting platform is lowered to the lower end position, thereby bringing the stopper part into an unlocked state. Was it Lifting device according to claim.   The lifting device according to claim 1, wherein the disk-like weight is rotatably attached. When the stopper part is in the locked state, the stopper part is a movement prohibition part that prohibits movement of the wheel in a direction away from the side drop prevention part with the wheel locked with the side drop prevention part interposed therebetween. The lifting device according to claim 1, wherein the lifting device is formed as described above.

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