JP2011032015A - Lifting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lifting device with a fall preventive means compact in the vertical direction. <P>SOLUTION: When a cable 7 suspending and supporting a lift 5 is cut, a moving body 31 is moved from a suspending position to a fall prevention position by the urging force of an elastic member 29 to rotate a pair of operating cams 32 in opposite directions to each other with the urging force of an urging means, allowing rotation of the pair of operating cams 32 toward a rotation urging side by the urging means. A pair of contact cams 33 integrally rotated with the pair of operating cams 32 around the same rotary axis X are rotated in opposite directions to each other, and the pair of contact cams 33 are pressed obliquely upward to the contact surface 11a of a support 6 to prevent the fall of the lift 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention provides a support for guiding the lifting body along the vertical direction, a rope body for supporting the lifting body in a suspended manner, and moving the lifting body in the longitudinal direction to move the lifting body up and down. The present invention relates to an elevating device provided with elevating / lowering means and fall prevention means for preventing the elevating body from dropping as the cable body is cut.

Such a lifting device is used when transporting articles supported by moving the lifting body up and down, and prevents the lifting body from falling when the cable body supporting the lifting body is suspended. Means are provided.
As a conventional example of such an elevating device, the support column is configured to include a pair of contact surfaces facing each other in parallel along the vertical direction, and the fall prevention means has a smaller distance from the contact surface toward the upper side. A pair of support pieces provided on the lifting body in an inclined posture, a link swingable around an axis along the horizontal direction, and a base end portion swingably connected to a distal end portion of the link. There is a structure including a pair of levers that are supported by suspension and a pair of rollers that are supported by the tip portions of the pair of levers and are positioned between the support piece and the contact surface of the column (for example, , See Patent Document 1).
In the elevating device of Patent Document 1, the link is biased so that the base end of the link is pushed downward by the elastic member, and when the elevating body is suspended and supported by the rope body, the rope body The base end side of the link is pulled up against the urging force of the elastic member due to the tension of the link, and the base end side of the link is pushed down by the urging force of the elastic member as the strip body is cut, and the link Swings so that the tip side moves upward. As a result, the arm is pulled upward, the roller moves upward, and the roller is held between the support piece and the support column. As described above, the roller is held between the support piece and the support column, so that the support piece is restricted from moving downward relative to the support column, and the lifting body is prevented from falling.

Japanese Utility Model Publication No. 6-27722

However, the conventional lifting device described above is configured to prevent the lifting body from falling by moving the roller upward and sandwiching the roller between the support piece and the support column, and the roller moves up and down. Therefore, the fall prevention means is large in the vertical direction.
Also, in order to allow the roller to move in the direction in which the support piece and the support column are aligned when the roller is held between the support piece and the support column, the arm is swingably supported by the link to support the arm. The roller is supported at the tip, but the fall prevention means is also large in the vertical direction by constructing the arm so as to be swingably supported by the link.

  This invention is made in view of the said actual condition, The objective is to provide the raising / lowering apparatus provided with the fall prevention means compact to the up-down direction.

The lifting device according to the present invention includes a column that guides the lifting body in the vertical direction, a rope body that suspends and supports the lifting body, and the lifting body that is moved and operated in the longitudinal direction thereof. Elevating / lowering means for moving the elevating and lowering preventing means for preventing the elevating body from dropping as the strip body cuts, and the first characteristic configuration thereof is:
The support column is configured to include a pair of contact surfaces facing each other or facing each other in parallel along the vertical direction, and the fall prevention means is urged by the urging means to rotate in opposite directions and is horizontal. A pair of operation cams mounted on the elevating body in a state of being aligned in a direction, and a rotation urging side by the urging means of the pair of operation cams by engaging with an engagement portion of the pair of operation cams Movable up and down with respect to the lifting body over a suspension position that restricts rotation to the position and a fall prevention position that allows rotation of the pair of operation cams toward the rotation biasing side, and When it is urged by an elastic member in a direction from the suspension position to the fall prevention position and the lifting body is suspended and supported by the cable body, the tension of the cable body causes the Positioned at the suspension position against the biasing force of the elastic member A moving body configured to move from the suspension position to the drop prevention position by the urging force of the elastic member as the strip body is cut, and the pair of operation cams, respectively. In the state where the movable body is mounted on the lifting body in a state of rotating integrally around the same rotational axis, the rotation of the operation cam is restricted when the moving body is positioned at the suspension position. A contact rotation posture in which the movable body moves to the fall prevention position and the operation cam rotates to press the contact surface obliquely from below to prevent the lifting body from falling. And a pair of contact cams that rotate.

  That is, when the lifting / lowering body is suspended and supported by the rope body, the movable body is positioned at the hanging position against the urging force of the elastic member due to the tension of the rope body. In the state where the moving body is located at the suspension position, the moving body is engaged with the engaging portions of the pair of operation cams, so that the rotation of the pair of operation cams toward the rotation urging side is restricted. Each of the pair of contact cams that rotate integrally around the same rotational axis as the pair of operation cams is in a separated rotation posture that is separated from the pair of contact surfaces of the support column. Thus, in the state where the pair of contact cams are in the separated rotation posture, each of the pair of contact cams is separated from the pair of contact surfaces of the support column, and the lifting movement of the lifting body is not restricted. The elevating body can be moved up and down by the elevating and moving means. That is, when the lifting / lowering body is suspended and supported by the rope body, the lifting / lowering body can be moved up and down by the lifting and lowering moving means.

  Then, as the rope body is cut, the tension of the rope body against the moving body is reduced, and the moving body moves to the position for preventing the fall by the biasing force of the elastic member. When the movable body moves to the position for preventing the fall, the pair of operation cams are allowed to rotate toward the rotation urging side, and the pair of operation cams rotate in opposite directions by the urging force of the urging means. Similarly, the pair of contact cams rotate in opposite directions, and each of the pair of contact cams comes into a contact posture and contacts and presses against the pair of contact surfaces obliquely from below. In this way, each of the pair of contact cams presses against the pair of contact surfaces facing each other or facing each other obliquely from the lower side, so that the pair of contact cams are caused by the weight of the lifting body falling due to the cutting of the cable body. Each of the contact cams is further pressed against the pair of contact surfaces of the support column in an attempt to rotate to the rotation bias side, and the pair of contact cams is restricted from moving downward relative to the support column to prevent the lifting body from falling. Is done. That is, the lifting body can be prevented from falling as the strip body is cut.

Thus, the pair of contact cams can be prevented from dropping by simply rotating the pair of contact cams from the separated rotation posture to the contact rotation posture, so that it is not necessary to move the pair of contact cams up and down. The installation space for the contact cam, particularly the installation space in the vertical direction, can be reduced, and the fall prevention means can be configured compactly in the vertical direction.
In addition, since the pair of contact cams can be prevented from falling by rotating the pair of contact cams from the separated rotation posture to the contact rotation posture, the pair of contact cams are allowed to move in the horizontal direction, for example, In order to allow the pair of contact cams to move in the horizontal direction, it is not necessary to include a member extending in the vertical direction, so that the drop prevention means can be configured compactly in the vertical direction.
Accordingly, it has become possible to provide an elevating device provided with a drop prevention means that is compact in the vertical direction.

  A second characteristic configuration of the lifting device according to the present invention is the first characteristic configuration, wherein the support column is formed by forming a recessed portion that is recessedly formed on the inner side of the support in the horizontal plane along the vertical direction. A pair of restricting rollers for restricting the swing of the lifting body along the horizontal direction are provided in the lifting body so as to be located in the recessed portion, and the pair of contact cams are positioned in the recessed portion. As described above, it is attached to the lifting body.

  That is, by positioning the pair of contact cams in the recesses where the pair of regulating rollers are positioned, it is not necessary to separately form the recesses dedicated to the pair of contact cams, and the structure of the column is simple. The pair of contact cams can be positioned in the recessed portion, and the pair of contact cams can be provided on the lifting body so that the pair of contact cams does not easily disturb the surroundings.

  According to a third characteristic configuration of the lifting device according to the present invention, in the second characteristic configuration, the support column includes a divided portion that divides the recessed portion into two in the width direction, and the pair of regulating rollers includes The lifting body is provided in a state of rolling with a pair of rolling surfaces facing each other formed by the divided portions, and the pair of contact cams rotate to the contact rotation posture, thereby It exists in the point with which it mounts | wears with the said raising / lowering body so that the said pair of contact surface which mutually opposes formed by recessing of an insertion part may be pressed.

  That is, by making the contact surface pressed by the pair of contact cams rotated in the contact rotation posture different from the pair of rolling surfaces on which the pair of regulating rollers roll, the cord body is cut and paired When the contact cam is pressed against the pair of contact surfaces of the support column, even if the contact surface of the support column is damaged by the pressing of the pair of contact cams, the portion forming the rolling surface of the support column is not affected. Or, since there is almost no influence, the elevating body can be moved up and down so that the regulating roller rolls on the rolling surface when it is restored or after the restoration.

  According to a fourth feature configuration of the lifting apparatus of the present invention, in any one of the first to third feature configurations, the moving body is located at the suspension position, the suspension position, and the drop. The pair of operation cams are engaged with the engaging portions of the pair of operation cams in a state positioned between the prevention positions, and the pair of operation cams are in a rotation posture corresponding to the contact rotation posture of the contact cams. In the point which is provided with the control part which controls that it rotates.

That is, in a state where the moving body is located at the hanging position or between the hanging position and the fall preventing position, the restricting portion of the moving body is engaged with the pair of operation cams, The pair of contact cams are not in the contact rotation posture, and each of the pair of contact cams is separated from the pair of contact surfaces of the support column, so that the lift body can be moved up and down by the lift moving means.
That is, when the lifting body is moved up and down, the tension of the cable body temporarily decreases due to the lifting body bouncing, and the moving body moves from the suspension position to the fall prevention position side, and the moving body May be located between the suspension position and the fall prevention position, but even in this case, the pair of contact cams will not be in the contact rotation position. Since the elevating body can be moved up and down without being restricted, the elevating movement of the elevating body can be continued.

  According to a fifth characteristic configuration of the lifting apparatus according to the present invention, in the fourth characteristic configuration, the restricting portion of the movable body moves from the suspension position to the fall prevention position side. The pair of contact cams are formed in a shape that gradually allows rotation to the contact rotation posture side.

  That is, the rotation amount of the pair of contact cams from the separated rotation posture to the contact rotation posture is increased to prevent the fall prevention means from malfunctioning when the lifting body is suspended and supported by the rope body. However, when the cable body is cut, the pair of contact cams are gradually allowed to rotate toward the contact rotation posture side as the moving body moves from the suspension position to the fall prevention position side. By rotating smoothly from the separated rotation posture to near the contact rotation posture, and rotating the pair of contact cams from near the contact rotation posture to the contact rotation posture as the moving body moves to the fall prevention position, The pair of contact cams can be quickly and accurately rotated to the contact rotation posture.

  A sixth characteristic configuration of the elevating device according to the present invention is any one of the first to fifth characteristic configurations, wherein the pair of operation cams, the pair of contact cams, the urging means, and the moving body However, it is attached to a substrate that can be mounted on the lifting body to form a fall prevention unit, and the movable body is configured to be connectable to a connecting member that connects the cable body to the lifting body. is there.

  That is, by attaching the fall prevention unit to the lifting body, it is possible to attach the fall prevention means retrofit to a lifting device that is not provided with the fall prevention means. In addition, since the pair of operation cams, the pair of contact cams, the urging means, and the moving body are attached to the board that can be mounted on the lifting body to constitute a fall prevention unit, the board is used as the lifting body. By attaching the moving body to the connection member, the fall prevention means can be easily attached to the lifting body.

  A seventh characteristic configuration of the lifting apparatus according to the present invention is the one in any one of the first to sixth characteristic configurations, in which the pair of operation cams is configured to place the strip body between the pair of rotating shafts. It exists in the point with which the said elevating body is mounted | worn so that the connection member connected to an elevating body may be located.

  That is, by mounting the pair of operation cams on the elevating body so that the connection member is positioned between the pair of rotation shafts around which the pair of rotation cams rotate, the pair of operation cams are greatly separated from the connecting member in the arrangement direction. Since the pair of operation cams can be gathered in the vicinity of the connecting member without coming off, the lifting operation means can be configured compactly in the direction in which the pair of operation cams are arranged.

Side view of stacker crane Partially cutaway plan view showing the regulating roller and fall prevention means Partially cutout plan view showing fall prevention means Side view showing the front end of the platform Front view showing the top of the platform Front view showing the top of the platform Perspective view of fall prevention means Perspective view of fall prevention means Exploded perspective view of fall prevention means The figure which shows the state where the raising / lowering stand was suspended and supported by the raising / lowering chain The figure which shows the state which the chain for raising / lowering cut | disconnected

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a stacker crane 1 as an elevating device is a fork that transfers articles between a traveling carriage 3 that can travel in the front-rear direction along a traveling rail 2 and a storage shelf (not shown). A lifting base 5 as a lifting body provided with a transfer device 4 of the type, a pair of front and rear columns 6 which are erected on the traveling carriage 3 to guide and support the lifting base 5 along the vertical direction, and the lifting base 5 is suspended. An elevating chain 7 serving as a rope body to be supported to be lowered, and an elevating motor 8 serving as an elevating movement means for moving the elevating platform 5 up and down by moving the elevating chain 7 in the longitudinal direction thereof are provided. Yes.
Hereinafter, the stacker crane 1 will be described, but the direction along the traveling direction of the stacker crane 1 will be described as the front-rear direction, and the horizontal direction orthogonal to the front-rear direction will be described as the lateral width direction.

[Support]
As shown in FIGS. 2 and 3, each of the pair of front and rear columns 6 is configured by forming, along the vertical direction, a recessed portion 11 that is recessedly formed on the inner side of the column in a horizontal view. The recessed portion 11 is formed by recessed an end portion on the inner side in the front-rear direction of the support column 6 on the outer side in the front-rear direction. Each of the pair of front and rear columns 6 includes a split portion 12 that protrudes inward in the front-rear direction from the bottom surface of the recessed portion 11 and divides the recessed portion 11 into two in the width direction.
Thus, by forming the recessed part 11 in the support | pillar 6, a pair of contact surface 11a which mutually opposes along the front-back direction and an up-down direction is formed in parallel along the up-down direction. Further, by forming the split portion 12 on the support column 6, a pair of rolling surfaces 12a for regulating the width direction facing each other along the front-rear direction and the vertical direction are formed in parallel along the vertical direction, and the width A rolling surface 12b for restricting the front-rear direction along the direction and the vertical direction is formed along the vertical direction.
Incidentally, the front side in the front-rear direction is the side where the center of the stacker crane 1 in the front-rear direction is located, and the outer side in the front-rear direction is the side opposite to the side where the center of the stacker crane 1 is located in the front-rear direction. is there.

  Although not shown in FIGS. 2 and 3, a recessed portion 11 is also formed at the end portion on the outer side in the front-rear direction of the support column 6 in the same manner as the end portion on the inner side in the front-rear direction. 6 is formed in the shape of a quadrangular prism symmetrical in the longitudinal direction. Further, in each of the four corners of the support column 6, a concave groove 13 is formed along the up-down direction with the back side wider than the opening side.

[Climbing chain]
As shown in FIG. 1, the lifting chain 7 is provided with a lifting chain 7 connected to the front end of the lifting platform 5 and a lifting chain 7 connected to the rear end of the lifting platform 5. Each of the pair of lifting chains 7 has one end connected to the lifting platform 5 and the other end connected to a winding drum 16 mounted on the traveling carriage 3. In addition, each of the pair of lifting chains 7 is wound around a guide sprocket 18 provided on the upper frame 17 and a guide sprocket 18 supported by the support column 6 on the front side.
Then, the stacker crane 1 rotates the winding drum 16 forward and backward with the lifting motor 8 to feed and wind the pair of lifting chains 7 so that the pair of lifting chains 7 are moved in the longitudinal direction. It moves along, and it is comprised so that the lifting platform 5 may be moved up and down.

[Regulation roller]
As shown in FIG. 2 and FIG. 4, the lifting platform 5 is subjected to a lateral width regulating roller 21 as a regulating roller that regulates the shaking along the lateral width direction of the lifting platform 5 and the shaking along the front-rear direction of the lifting platform 5. A front-rear direction regulating roller 22 for regulating is attached.
The attachment of the lateral direction regulating roller 21 and the longitudinal direction regulating roller 22 to the lifting platform 5 will be described. As shown in FIGS. 2 and 5, a pair of lateral direction regulating rollers 21 and one longitudinal direction regulating roller 22 are provided. The regulating roller unit 24 is configured by being mounted on a roller mounting substrate 23 that can be mounted on the lifting platform 5. The lateral width direction regulating roller 21 is attached to the roller mounting substrate 23 so as to be rotatable around the axial center along the front-rear direction in the state of being attached to the lifting platform 5, and the front-rear direction regulating roller 22 is attached to the lifting platform 5. In this state, it is attached to the roller mounting substrate 23 so as to be rotatable around the axis along the horizontal width direction.
As shown in FIGS. 1 and 4, the front and rear ends of the lifting platform 5 are provided with frame bodies 25 in a state of protruding upward, and the upper and lower portions of the pair of frame bodies 25 are respectively provided. A restriction roller unit 24 is mounted, and a total of eight lateral width restriction rollers 21 and a total of four front-rear direction restriction rollers 22 are attached to the lifting platform 5.
Incidentally, the elevating chain 7 is connected to each of the pair of frame bodies 25, and the transfer device 4 is provided at a position located between the pair of frame bodies 25 in the elevating platform 5.

  As shown in FIG. 2, the pair of lateral direction regulating rollers 21 are attached to the lifting platform 5 in a state of being aligned in the lateral direction so as to roll on the pair of rolling surfaces 12 a for regulating the lateral direction. As described above, each of the pair of lateral direction regulating rollers 21 attached to the lifting platform 5 is located in the recessed portion 11 as a whole. The front-rear direction regulating roller 22 is attached to the lifting platform 5 so as to roll on the rolling surface 12b for front-rear direction regulation. The front-rear direction regulating roller 22 attached to the lifting platform 5 in this way is entirely located outside the recessed portion 11.

(Connecting member)
As shown in FIGS. 4 and 5, each of the pair of elevating chains 7 is connected to the elevating platform 5 by a connecting member 26. The connecting member 26 for connecting the lifting / lowering chain 7 to the lifting / lowering base 5 has a connecting portion to which one end side of the lifting / lowering chain 7 is connected at the upper end portion, and a thread is threaded from the upper and lower intermediate portion to the lower end portion. The rod-like body 27 in the posture along the vertical direction and the nut inserted into the threaded screw 27 are screwed down to the lower side and are kept downward by a compression spring 29 as an elastic member. An urging regulating body 28 is provided.

  An insertion hole 25a having a diameter larger than that of the rod-shaped body 27 and smaller than that of the restricting body 28 is formed along the vertical direction in each of the pair of frame bodies 25 of the lifting platform 5, and the rod-shaped body 27 is inserted into the insertion hole 25a. Thus, the restricting body 28 is positioned below the insertion hole 25a. The connecting member 26 has an upper position (see FIG. 10) where the restricting body 28 abuts the periphery of the insertion hole 25a and is moved upward with respect to the lifting platform 5 (see FIG. 10), and the suspension position. Further, it is configured to be movable to a lower position (see FIG. 11) that has moved downward relative to the lifting platform 5.

  That is, the connecting member 26 is located at an upper position against the urging force of the compression spring 29 due to the tension of the elevating chain 7 when the elevating platform 5 is supported by the elevating chain 7 and suspended. The chain 7 is configured to move from the upper position to the lower position by the urging force of the compression spring 29 as the chain 7 is cut. And the limit switch 30 as a detection means which detects that the connection member 26 moved to the downward position is provided, It is comprised so that it can detect that the raising / lowering chain 7 was cut | disconnected by this limit switch 30. FIG. .

(Fall prevention means)
As shown in FIG. 6, the stacker crane 1 is provided with a fall prevention means 9 that prevents the lifting platform 5 from falling as the lifting chain 7 is cut.
As shown in FIGS. 7 to 9, the fall prevention means 9 is a pair of rotary springs urged in opposite directions by coil springs 34 as urging means and mounted on the lifting platform 5 in a state of being aligned horizontally. A suspension position that engages with the operation cam 32 and the engaging portion 32a of the pair of operation cams 32 and restricts the rotation of the pair of operation cams 32 toward the rotation biasing side by the coil spring 34 (see FIG. 10) and a pair of movable bodies 31 that are movable up and down with respect to the lifting platform 5 over a position for preventing the fall (see FIG. 11) that allows the pair of operation cams 32 to move toward the rotationally biased side. Are attached to the lifting platform 5 so as to rotate integrally around the same rotation axis X as each of the operation cams 32, and the contact surface of the support column 6 as the pair of operation cams 32 rotate to the rotation biasing side. Contact surface 1 from the separated rotation posture (see FIG. 10) separated from 11a It is constituted by a pair of contact cam 33 which rotates in contact rotary posture pressed to prevent the fall of the lifting platform 5 (see FIG. 11) obliquely from below in a.

A pair of operation cams 32, a pair of contact cams 33, a coil spring 34, and a moving body 31 that constitute these drop prevention means 9 are attached to a fall prevention mounting board 35 as a board that can be attached to the lifting platform 5. Thus, the fall prevention unit 36 is configured, and the moving body 31 is configured to be connectable to the connection member 26. That is, after the rod-shaped body 27 of the connecting member 26 is inserted into the hole formed in the moving body 31, the fall prevention mounting substrate 35 is mounted on the lifting platform 5 by the mounting member 37 configured by a bolt, and the nut is attached to the nut. The movable body 31 is fixed to the rod-shaped body 27 by the fixing member 38 configured as described above, and the fall prevention means 9 can be retrofitted to the stacker crane 1 not provided with the fall prevention means 9 as shown in FIG. It is configured.
Incidentally, the drop-preventing unit 36 is attached to the lifting platform 5 by being fastened together with the roller mounting substrate 23 by the mounting member 37 for mounting the roller mounting substrate 23 to the lifting platform 5. Further, the movable body 31 is fixed to the rod-like body 27 by holding it with upper and lower fixing members 38 screwed into the threads of the rod-like body 27.

  Since the moving body 31 is fixed to the rod-like body 27 so as to move up and down integrally with the connecting member 26, the moving body 31 is compressed downward from the hanging position toward the fall preventing position, similarly to the connecting member 26. When the lifting platform 5 is suspended and supported by the lifting chain 7 while being biased by the spring 29, the lifting position is shown against the biasing force of the compression spring 29 by the tension of the lifting chain 7. FIG. (Refer to FIG. 11) from the suspension position to the fall prevention position (see FIG. 11) by the urging force of the compression spring 29 as the lifting chain 7 is cut. When the connecting member 26 is located at the upper position, the moving body 31 is located at the hanging position, and as the connecting member 26 moves to the lower position, the moving body 31 is also moved to the fall preventing position. Become There.

Next, each member of the fall prevention means 9 will be described.
[Fall prevention mounting board]
As shown in FIGS. 6 to 9, the fall prevention mounting substrate 35 is mounted on the frame body 25 so as to protrude upward from the lifting platform 5, and is located above the lifting platform 5 on the fall prevention mounting substrate 35. An insertion groove 41 into which the moving body 31 is inserted is formed in the upper part in the vertical direction, and is rotatable around the rotation axis X along the front-rear direction, and the operation cam 32 and the contact cam 33. A pair of support shafts 42 are arranged side by side in the width direction, and a pair of operation cams 32, a pair of contact cams 33, a coil spring 34, and a moving body 31 are provided on the upper portion of the fall prevention mounting substrate 35. And are attached. Incidentally, the pair of support shafts 42 are arranged such that the connection member 26 is positioned between the rotation axes X of the pair of support shafts 42.

  In addition, the upper portion of the drop prevention mounting substrate 35 is provided with a regulating member 43 composed of a bolt that is detachable from the fall prevention mounting substrate 35, and the fall prevention means 9 is attached to the lifting platform 5. Sometimes, the restriction member 43 is attached to the fall prevention attachment substrate 35 so that the restriction member 43 contacts the contact portions 32b of the pair of operation cams 32 and the pair of operation cams 32 are rotated by the coil springs 34. By restricting the rotation to the urging side, the fall prevention means 9 can be easily attached to the lifting platform 5.

[Operation cam]
The pair of operation cams 32 are fixed to the pair of support shafts 42 so as to rotate integrally with the support shaft 42 and are juxtaposed in the lateral width direction, and between the rotation axis X of the pair of operation cams 32. The lifting / lowering base 5 is mounted so that the lifting / lowering chain 7 is positioned. As shown in FIG. 11, the operation cam 32 positioned on the right side is urged to rotate clockwise by the coil spring 34 when viewed in the front-rear direction, and the operation cam 32 positioned on the left side is rotated by the coil spring 34. It is urged to rotate counterclockwise. Incidentally, the support shaft 42 is provided in a state of penetrating the fall prevention mounting substrate 35 in the front-rear direction, and the operation cam 32 projects inward from the drop prevention mounting substrate 35 on the support shaft 42. It is fixed to the part.

  Each of the pair of operation cams 32 is in a state (see FIG. 10) in which the movable body 31 is positioned at the withdrawal position and the regulating portion 31a of the movable body 31 is engaged with the engaging portion 32a (see FIG. 10) or the contact portion 32b. In the state in which the regulating member 43 is in contact (see FIG. 7), the rotation position for engagement corresponds to the rotation position for separation of the contact cam 33, and the rotation position for rotation by the coil spring 34 is rotated from this rotation position for engagement. By doing so, it is configured to rotate to a release rotation posture (see FIG. 11) corresponding to the contact rotation posture of the contact cam 33. That is, each of the pair of operation cams 32 is rotationally biased by the coil spring 34 from the engagement rotation posture to the release rotation posture side.

[Moving object]
The moving body 31 is fitted in the insertion groove 41 of the fall prevention mounting board 35 and is attached to the fall prevention mounting board 35 so as to be movable up and down with respect to the fall prevention mounting board 35 and immovable in the lateral width direction. Yes.
The moving body 31 is formed with a pair of restricting portions 31a that engage with the pair of operation cams 32 in the lateral width direction, and the pair of restricting portions 31a are positioned on the inner sides in the lateral width direction. The surface to be touched (the surface with which the pair of operation cams 32 come into contact) is formed as an inclined surface located on the outer side in the lateral width direction as it goes upward. The inclined surface in the restricting portion 31a is formed along the engaging surface of the engaging portion 32a in the operation cam 32 in the engaging rotation posture, and the restricting portion 31a is positioned with the movable body 31 positioned at the withdrawal position. In a state where the engaging portion 32a of the operation cam 32 is engaged, the restricting portion 31a is formed so as to be in surface contact with the engaging portion 32a. Incidentally, the engaging surface of the engaging portion 32 a is formed along the radial direction of the operation cam 32.

In a state where the moving body 31 is positioned at the suspension position, the pair of restricting portions 31a engage with the engaging portions 32a of the pair of operation cams 32, so that the pair of operation cams 32 is rotated for release. Rotation to the posture side is restricted, and the pair of operation cams 32 are in the engagement rotation posture.
As the movable body 31 moves from the suspension position to the fall prevention position side, the pair of restricting portions 31a engages with the engaging portions 32a of the pair of operation cams 32, thereby causing a pair of operation cams 32. Although the rotation to the release rotation posture is restricted, the contact point between the restricting portion 31a and the engaging portion 32a moves upward along the inclined surface. The rotation toward the release rotation posture is gradually allowed to rotate to an intermediate posture between the engagement rotation posture and the release rotation posture.
As the moving body 31 moves to the position for preventing the fall, the pair of restricting portions 31a are still engaged with the engaging portions 32a of the pair of operation cams 32, but are engaged with the restricting portions 31a. When the contact point with the portion 32a further moves upward along the inclined surface, the pair of operation cams 32 are allowed to rotate to the release rotation posture and rotate to the release rotation posture. ing.

[Contact cam]
The pair of contact cams 33 are fixed to the pair of support shafts 42 so as to rotate integrally with the support shaft 42 and are arranged in parallel in the lateral width direction. Similarly to the operation cam 32, the contact cam 33 located on the right side is urged to rotate clockwise by the coil spring 34 when viewed in the front-rear direction, and the contact cam 33 located on the left side is coil coil 34. Is urged to rotate counterclockwise. Each of the pair of contact cams 33 is fixed to a portion of the support shaft 42 that protrudes outward in the front-rear direction from the drop prevention mounting board 35. Each of the pair of contact cams 33 attached in this way is located entirely within the recessed portion 11.
Incidentally, the coil spring 34 is positioned between the fall prevention mounting board 35 and the contact cam 33 through which the support shaft 42 is inserted, and is connected to the fall prevention mounting board 35 and the contact cam 33. Yes.

Each of the pair of contact cams 33 changes from the separation portion 33a positioned at the same height as the rotation axis X in the separation rotation posture to the contact portion 33b located at the same height as the rotation axis X in the contact rotation posture. The contact portion 33b is formed in a bulging shape away from the rotation axis X toward the contact portion 33b, and the length of the outer periphery from the rotation axis X in the separation portion 33a is the contact surface 11a of the rotation axis X and the support column 6. The distance from the rotation axis X to the outer periphery of the contact portion 33b is the same as or longer than the distance between the rotation axis X and the contact surface 11a of the support column 6.
Therefore, each of the pair of contact cams 33 is separated from the contact surface 11a of the support column 6 in the separation rotation posture, and contacts the contact surface 11a of the support column 6 from obliquely below by rotating in the contact rotation posture. It is comprised so that it may press.

  Each of the pair of contact cams 33 makes it easy for the outer peripheral portion of the contact portion 33b and the outer peripheral portion between the separation portion 33a and the contact portion 33b to bite into the contact surface 11a by pressing the contact surface 11a of the support column 6. In addition, irregularities such as a saw blade are formed.

  Since the fall prevention means 9 is configured in this way, when the elevating chain 7 is cut and the connecting member 26 is moved from the upper position to the lower position by the urging force of the compression spring 29, the moving body 31 is moved together with the connecting member 26. Moves from the suspension position to the fall prevention position. As the moving body 31 moves in this manner, the pair of operation cams 32 rotate in the opposite directions from the engagement rotation posture to the release rotation posture, and the pair of contact cams 33 also contact from the separation rotation posture. The pair of contact cams 33 are rotated in the opposite directions to the rotation orientation for use, and the pair of contact cams 33 press against the pair of contact surfaces 11a facing each other on the support column 6 obliquely from below, thereby preventing the lifting platform 5 from falling. .

[Another embodiment]
(1) In the above embodiment, the pair of regulating rollers 21 are rolled on a pair of oppositely formed surfaces formed by the divided portions 12, and the pair of contact cams 33 are formed by recessing the recess 11. Although a pair of mutually opposed surfaces are pressed, the surface for rolling the pair of regulating rollers 21 and the surface for pressing the pair of contact cams 33 may be appropriately changed.

  In other words, a pair of oppositely formed surfaces formed by the divided portions 12 are used as contact surfaces, and a pair of contact cams 33 are pressed against the contact surfaces, and a pair of opposing surfaces formed by recessing the recess 11 is formed. The pair of regulating rollers 21 may be rolled using the surface as a rolling surface. Incidentally, in this case, the contact cam 33 located on the right side in the front-rear direction is urged counterclockwise by the coil spring 34, and the contact cam 33 located on the left side is rotated clockwise by the coil spring 34. Energize.

  Further, the pair of regulating rollers 21 are rolled on the pair of oppositely facing surfaces formed by the divided portions 12 and the pair of contact cams 33 are pressed, or each other is formed by recessing the recess 11. The pair of regulating rollers 21 are rolled on the pair of opposing surfaces and the pair of contact cams 33 are pressed, and the pair of contact rollers 33 and the pair of contact cams 33 are pressed. The surface may be the same surface.

(2) In the above embodiment, the recessed portion 11 is formed, and the pair of regulating rollers 21 and the pair of contact cams 33 are provided so as to be positioned in the recessed portion 11. The pair of regulating rollers 21 are positioned so as to be positioned outside the recessed portion 11 by rolling the pair of regulating rollers 21 as moving surfaces or pressing the pair of contact cams 33 using the lateral side surfaces of the support columns 6 as contact surfaces. Alternatively, a pair of contact cams 33 may be provided. When both the pair of regulating rollers 21 and the pair of contact cams 33 are rolled or pressed on the lateral side surface of the column 6, the recessed portion 11 does not have to be formed in the column 6.

(3) In the above embodiment, the restricting portion 31a of the moving body 31 is contacted from the separated rotation posture of the pair of contact cams 33 as the moving body 31 moves from the suspension position to the fall prevention position side. Although it is formed in a shape that gradually allows rotation to the rotation posture side, the restricting portion 31a of the movable body 31 is moved to the fall prevention position even if the movable body 31 moves from the suspension position to the fall prevention position side. Until it moves, the pair of contact cams 33 may be formed in a shape that restricts the rotation from the separated rotation posture to the contact rotation posture side and maintains the pair of contact cams 33 in the separated rotation posture.
That is, for example, when the engagement surface of the engagement portion 32a of the operation cam 32 is formed to be vertical in the engagement rotation posture, the engagement of the operation cam 32 in the restricting portion 31a of the moving body 31. The surface that contacts the mating surface may be formed as a vertical surface.

(4) In the above embodiment, the pair of operation cams 32 are in the release positions in the state where the moving body 31 is located at the suspension position and between the suspension position and the fall prevention position. However, only when the movable body 31 is positioned at the withdrawal position, the pair of operation cams 32 is restricted from rotating to the release position, and is positioned at the fall prevention position. In addition, the pair of operation cams 32 may be allowed to rotate to the release position even in a state between the suspension position and the fall prevention position.

(5) In the above embodiment, the pair of operation cams 32, the pair of contact cams 33, the urging means 34, and the moving body 31 are attached to the substrate 35 that can be mounted on the elevating body 5. The fall prevention unit 9 is attached to the lifting body 5 by attaching the fall prevention unit 36 to the lifting body 5. However, the pair of operation cams 32, the pair of contact cams 33, You may comprise so that the fall prevention means 9 may be mounted | worn with the raising / lowering body 5 by attaching the biasing means 34 and the mobile body 31 to the raising / lowering body 5 separately.

(6) In the above embodiment, the pair of operation cams 32 are mounted on the lifting body 5 so that the connecting member 26 is positioned between the pair of rotation shafts X around which the pair of operation cams 32 rotate. Both of these are positioned on one side in the lateral width direction of the connection member 26, and the pair of operation cams 32 are attached to the lifting body 5 so that the connection member 26 is not positioned between the pair of rotation axes X. May be.

(7) In the above embodiment, the operation cam 32 and the contact cam 33 are formed separately, but the operation cam 32 and the contact cam 33 may be formed integrally. Moreover, in the said embodiment, although the rope body 7 was comprised with the chain as a raising / lowering chain, the rope body 7 may be comprised with a belt or a wire.

(8) In the above embodiment, one end side of the rope body 7 is connected to the lifting body 5 from above and the other end side is connected to the winding drum 16. The other end side may be connected to the elevating body 5 from the lower side, and the rope body 7 may be provided in a loop shape. In this case, the other end side of the rope body 7 may be connected to the lifting body 5 by the connection member 26, and the connection member 26 is moved downward by the biasing force of the elastic member 29 as the rope body 7 is cut. By moving from the position to the upper position, the moving body 31 may be moved upward with respect to the lifting body 5 and moved from the suspension position to the fall prevention position.

(9) In the above embodiment, a pair of front and rear columns 6 is provided, and the lifting body 5 is guided along the vertical direction by the pair of front and rear columns 6, but a single column 6 is provided, You may comprise so that the raising / lowering body 5 may be guided to the up-down direction with the single support | pillar 6. FIG.
Moreover, in the said embodiment, a pair of cable body 7 of the cable body 7 connected with the front-end part of the raising / lowering body 5 and the cable body 7 connected with the rear-end part of the raising / lowering body 5 is provided, and a pair of The lifting body 5 is suspended and supported by the rope body 7. However, a single rope body 7 that supports the front end portion or the rear end portion of the lifting body 5 is provided, and the single rope body 7 is provided. The lifting / lowering body 5 may be supported by being suspended.

(10) In the above embodiment, the lifting device 1 is a stacker crane, but it may be a lifting device that does not have a function of traveling in the horizontal direction.

DESCRIPTION OF SYMBOLS 5 Lifting body 6 Support | pillar 7 Strip body 8 Elevating / moving means 9 Fall prevention means 11 Recessed part 11a Contact surface 12 Divided part 12a Rolling surface 21 Restriction roller 26 Connection member 29 Elastic member 31 Moving body 31a Restriction part 32 Operation cam 32a Engagement part 33 Contact cam 34 Biasing means 35 Substrate 36 Drop prevention unit X Rotation axis

Claims (7)

A column for guiding the lifting body along the vertical direction;
A rope body that supports the lifting body in a suspended manner;
Elevating and moving means for moving the elevating body up and down by moving the strip body in the longitudinal direction;
An elevating device provided with a fall prevention means for preventing the elevating body from falling as the strip body cuts,
The support column is configured to include a pair of contact surfaces facing each other or facing each other in parallel along the vertical direction,
The fall prevention means is
A pair of operating cams that are urged to rotate in opposite directions by the urging means and are mounted on the elevating body in a state of being aligned in the horizontal direction;
A suspension position that engages with an engaging portion of the pair of operation cams and restricts rotation of the pair of operation cams toward the rotation urging side by the urging means and the pair of operation cams It is possible to move up and down with respect to the elevating body over a fall prevention position that allows rotation to the rotation urging side, and with an elastic member in a direction from the suspension position to the fall prevention position. When the lifting and lowering body is suspended and supported by the rope body, the suspension body is positioned at the suspension position against the biasing force of the elastic member due to the tension of the rope body, A movable body configured to move from the suspension position to the fall prevention position by the urging force of the elastic member as the strip body is cut;
Mounted on the lifting body in a state of rotating integrally around the same rotational axis as each of the pair of operation cams, the movable body is positioned at the suspension position and the rotation of the operation cam is restricted. In this state, the moving body is moved away from the contact surface, and the movable body moves to the drop-preventing position and the operation cam rotates to push the contact surface obliquely from below. Lifting device comprising a pair of contact cams that rotate in a contact rotation posture that prevents falling. The strut is configured by forming a recessed portion that is recessed on the inner side of the strut in a horizontal view along the vertical direction,
A pair of regulating rollers for regulating shaking along the horizontal direction of the elevating body is provided in the elevating body so as to be located in the recessed portion,
The lifting device according to claim 1, wherein the pair of contact cams are mounted on the lifting body so as to be positioned in the recessed portion. The support column is configured to include a divided portion that divides the recessed portion into two in its width direction,
The pair of regulating rollers are provided in the lifting body in a state of rolling a pair of rolling surfaces facing each other formed by the divided portions,
The pair of contact cams are mounted on the lifting body so as to press the pair of contact surfaces facing each other formed by recessing the recessed portion by rotating to the contact rotation posture. Item 3. The lifting device according to Item 2.   The movable body is engaged with the engaging portions of the pair of operation cams in a state where the movable body is located at the suspension position and between the suspension position and the fall prevention position, The said pair of operation cam is provided with the control part which controls that it rotates to the rotation attitude | position corresponding to the said rotation attitude for a contact of the said contact cam, The structure of any one of Claims 1-3 comprised. Lifting device.   The regulating portion of the moving body gradually rotates the pair of contact cams toward the contact rotation posture side as the moving body moves from the suspension position to the fall prevention position side. The lifting device according to claim 4, wherein the lifting device is formed in an allowable shape. The pair of operation cams, the pair of contact cams, the biasing means, and the moving body are attached to a substrate that can be attached to the elevating body to constitute a fall prevention unit,
The elevating device according to any one of claims 1 to 5, wherein the movable body is configured to be connectable to a connecting member that connects the cable body to the elevating body.   The pair of operation cams are mounted on the lifting body so that a connecting member for connecting the cable body to the lifting body is located between the pair of rotation shafts. The lifting device according to claim 1.

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