JP6108591B2 - Roll prevention device for lift bracket - Google Patents

Description

  The present invention relates to a roll bracket rolling preventing device that is attached to an inner mast of a cargo handling vehicle such as a forklift so as to be movable up and down.

  Conventionally, a pair of left and right lift brackets that are attached to the inner mast so as to be movable up and down is generally prevented from swinging back and forth by rolling a lift roller provided on the lift bracket in a vertical groove of the inner mast. Side rolls are prevented by rolling the side rollers provided respectively on the upper and lower portions of the lift bracket against the side surfaces of the inner mast (for example, Patent Document 1).

JP-A-6-48694

  When a container or the like is loaded on the fork of the forklift, the container is loaded so that the center of gravity of the container is located between the left and right forks. Usually, the center of gravity of the container is near the center of the left-right width of the container. Therefore, in a normal cargo handling operation, the fork loaded with the container is not likely to receive an uneven load on either the left or right side, and the side roller does not receive a large load.

  However, originally, a large load should not act on the side roller, but the inner mast may be damaged by the side roller.

  This is because depending on the container being loaded, the contents of the container are biased to the left and right sides, so the center of gravity of the container may be biased to the left and right sides. In some cases, an excessive “lateral load” (load in the left-right direction of the vehicle body) is applied due to an uneven load, and a high load is applied to a particular upper side roller. The applied side roller does not roll but slides against the inner mast, and as a result, it has been found that the inner mast is damaged by being dented or scraped.

  In addition, as described above, the side roller was not expected to receive a large load in normal use, so a roller having a smaller diameter was adopted as compared with the lift roller, and the rigidity was reduced by making the diameter smaller. Made of a material harder than the inner mast to prevent cracking. The fact that the side rollers were made of a material harder than the inner mast was also found to be a factor that damages the inner mast.

  Accordingly, the present invention has as its main object to provide a lift bracket roll prevention device that can reduce damage to the inner mast even when an excessive lateral load is applied due to left and right offset loads. To do.

  To achieve the above object, a roll bracket rolling prevention device according to the present invention includes a lift bracket and a guide member attached to the lift bracket to prevent the inner mast from rolling. The member has a flat surface capable of sliding contact with a side surface of the inner mast, and the flat surface is formed of a metal material having a lower hardness than the inner mast.

  It is preferable that the guide member is swingably attached to the lift bracket.

  It is preferable that the guide member is detachably attached to the lift bracket.

  It is preferable that the guide member is attached to the lift bracket so that a relative position to the inner mast can be adjusted.

  The guide member preferably includes a main body portion attached to the lift bracket and a contact member detachably attached to the main body portion and having the flat surface.

  It is preferable that a shim for adjusting a gap between the contact member and the inner mast is detachable between the main body portion and the contact member.

  The main body portion has a shaft hole through which a shaft portion protruding from the lift bracket can be inserted, and a male screw portion extending radially outward from an outer peripheral surface, and the contact member can accommodate the main body portion. An elongated hole and a through hole that communicates with the elongated hole and through which the male screw part can be inserted, and has the flat surface on the opposite side of the through hole through the elongated hole, and is screwed into the male screw part. It is preferable to further include a lock nut that is inserted to fix the contact member to the male screw portion.

  The lift bracket has a pair of left and right, and both of the guide member and the side roller can be attached to the shaft portion protruding from each of the pair of left and right lift brackets, and the shaft portion of one of the left and right lift brackets It is preferable that the guide member is mounted on the left side and the side roller is mounted on the left or right lift bracket.

  According to the present invention, since the inner mast can be slid and guided by the guide member having a flat surface formed of a material softer than the inner mast, an excessive lateral load due to an offset load is applied. Also, damage to the inner mast can be reduced.

It is a perspective view which shows 1st Embodiment of the rolling prevention apparatus of the lift bracket which concerns on this invention. It is a perspective view which expands and shows the principal part of FIG. It is a top view which expands and shows the principal part of the mast to which the lift bracket of FIG. 1 is attached. FIG. 5 is an exploded perspective view showing a guide member according to a second embodiment of the apparatus for preventing the roll of a lift bracket according to the present invention. FIG. 5 is a perspective view after the guide member of FIG. 4 is assembled.

  DESCRIPTION OF EMBODIMENTS Embodiments of a roll bracket roll prevention device according to the present invention will be described below with reference to FIGS. In all the drawings and all the embodiments, the same components are denoted by the same reference numerals.

  First, a first embodiment of a roll bracket rolling preventing device according to the present invention will be described with reference to FIGS. 1 is a perspective view of the lift bracket as viewed from the back side, FIG. 2 is an enlarged perspective view showing a guide member, which is a main part of FIG. 1, and FIG. 3 is a main part of the mast to which the lift bracket is attached. It is a top view which expands and shows.

  The lift bracket 1 has a pair of left and right, and a finger bar 3 for attaching a fork 2 (FIG. 3) to the front is welded. Shafts 5, 5, and 5 for attaching the lift roller 4 (FIG. 3) project from the side surface of the lift bracket 1. In addition, a connecting portion 6 for connecting a chain (not shown) that suspends the lift bracket 1 is fixed to the lift bracket 1. The lift bracket 1 is suspended by a chain (not shown) and moves up and down the inner surface of the inner mast 7 (FIG. 3). An outer mast 8 (FIG. 3) is disposed outside the inner mast 7.

  The lift bracket 1 in the illustrated example includes a base portion 1a from which a shaft 5 protrudes, a side plate 1b that is fixed at a right angle to a front end edge of the base portion 1a, and extends in the lateral direction of the vehicle body (left and right outward direction) along the finger bar 3. It has.

  The guide member 10 is attached to the side plate 1b. The guide member 10 has a flat surface 11 capable of sliding contact with the side surface of the inner mast 7. The guide member 10 includes a main body portion 12 attached to the lift bracket 1 and a contact member 13 that is detachably attached to the main body portion 12 and has a flat surface 11.

  The main body portion 12 of the guide member 10 includes a shaft hole 14 through which a shaft portion 1c protruding from the side plate 1b is inserted. The guide member 10 is swingably attached to the lift bracket 1 by inserting the shaft portion 1c into the shaft hole 14 of the main body portion 12. A snap ring engaging circumferential groove 1d (FIG. 2) is formed in the shaft portion 1c, and the guide member 10 is detachably attached to the lift bracket 1 by engaging the snap ring 15 with the circumferential groove 1d.

  The contact member 13 having the flat surface 11 is made of a metal material having a lower hardness than the inner mast 7, that is, a metal material softer than the inner mast 7. For example, the inner mast 7 is made of SM570 steel, and the contact member 13 is made of S45C steel having a lower hardness than the SM570 steel used for the inner mast 7. Although the hardness of the main-body part 12 is not specifically limited, For example, it can be formed with a metal harder than the contact member 13.

  The contact member 13 has a plate shape and is provided with a fitting convex portion 16 on one surface, and the fitting convex portion 16 is fitted into the fitting concave portion 17 formed in the main body portion 12, thereby allowing the main body portion 12 to be fitted. Removably attached.

  A shim 18 for adjusting the gap between the contact member 13 and the lift bracket 1 can be detachably mounted between the main body 12 and the contact member 13. The shim 18 is formed with a fitting hole 19 into which the fitting convex portion 16 of the contact member 13 can be inserted, and by inserting the fitting convex portion 16 through the fitting hole 19 into the fitting concave portion 17, A shim 18 is held between the main body 12 and the contact member 13.

  The gap between the inner mast 7 and the contact member 13 is such that the gap between the other contact member 13 and the inner mast 7 is 0.5 to 1 mm in a state where one of the left and right contact members 13 is pressed against the inner mast 7. The number of shims 18 is adjusted so that By providing a predetermined gap between the inner mast 7 and the contact member 13, the lift bracket 1 moves up and down smoothly. In order to improve sliding, a lubricant such as grease may be applied to the flat surface 11 of the contact member 13 that can come into contact with the side surface of the inner mast 7.

  If the lateral load is received when the lift bracket 1 moves up and down, one of the left and right contact members 13 is in strong contact with the side surface of the inner mast 7 (that is, receives a high load) and slides. Since the contact member 13 is made of a metal material having a lower hardness than the metal material forming the inner mast 7, that is, a metal softer than the inner mast 7, the contact member 13 does not damage the sliding surface of the inner mast 7. The flat surface 11 of the member 13 is worn out. Since the contact member 13 is detachably attached to the main body 12, the contact member 13 is replaced with a new one if it is worn to some extent by use.

  Since the contact member 13 is in surface contact with the side surface of the inner mast 7 at the flat surface 11, the pressure receiving area is increased and the occurrence of cracks and chips can be eliminated as compared with the case of line contact like the side roller S1. .

  In addition, the side surface of the inner mast 7 is usually not completely flat but has slightly undulating irregularities. By making the guide member 10 swingable, the flat surface 11 of the guide member 10 7 can follow the minute irregularities on the side surface of the surface 7 and can also follow the inclination of the lift bracket 1 when the finger bar 3 receives a lateral load, so that the sliding contact with the inner mast 7 by lifting and lowering the lift bracket 1 is possible. The contact can be made with a uniform surface pressure over the entire range, and uneven wear such as a reduction of one side can be prevented.

  The guide member 10 can be attached to both the left and right lift brackets 1 and 1, but can also be attached only to either the left or right lift bracket 1. For example, when the center of gravity of the container to be loaded is biased to only one of the left and right and it is determined whether it is biased to the left or right, only the side receiving the high load due to the inclination of the lift bracket 1 due to the lateral load is guided. It is also possible to attach the member 10 and attach the side roller S1 (FIG. 1) to the lift bracket 1 on the other side instead of the guide member 10.

  The lift bracket 1 also has a side roller S2 attached to the lower portion of the base portion 1a so as to be in contact with the inner inner surface of the inner mast 7. When the center of gravity of the container to be loaded is eccentric and a lateral load is applied to the finger bar 3, the guide member 10 provided at the upper part of the lift bracket 1 mainly hits the inner mast 2 and receives a large load, and the load applied to the lower side roller S2. Therefore, the guide member 10 can be provided only on the upper part of the lift bracket 1, but the lower side roller S2 can be changed to a guide member.

  Next, a second embodiment of a lift bracket roll preventing apparatus according to the present invention will be described with reference to FIGS. FIG. 4 is an exploded perspective view showing the guide member 10A of the second embodiment, and FIG. 5 is a perspective view after the assembly.

  4 and 5 includes a main body portion 12A, a contact member 13A, and lock nuts 20 and 21. The main body portion 12A includes a shaft hole 14A through which the shaft portion 1c projecting from the lift bracket 1 can be inserted, and a male screw portion 22 extending radially outward from the outer peripheral surface. 13 A of contact members have the long hole 23 which can accommodate the main-body part 12A, and the through-hole 24 which can be penetrated to the long hole 23 and can insert the male screw part 22, and are opposite to the through-hole 24 via the long hole 23. Is provided with a flat surface 11A and is formed of a metal material having a lower hardness than the inner mast 7. Since the lock nuts 20 and 21 are screwed with the contact member 13 </ b> A interposed therebetween, the pair of lock nuts 20 and 21 are screwed into the male screw portion 22. The male screw portion 22 is screwed into a bottomed screw hole 25 formed in the main body portion 12A and is fixed to the main body portion 12A. By adjusting the screwing positions of the lock nuts 20, 21, the relative position with the inner mast 7 can be adjusted.

  When the contact member 13A is worn out by use, the guide member 10A having such a configuration can be fixed at a position where the contact member 13A is moved toward the inner mast 7 by the adjustment of the lock nuts 20 and 21. . Therefore, the contact member 13 </ b> A can appropriately maintain the gap with the inner mast 7 by appropriately adjusting the position without being replaced for a long time even if worn out.

  In the first and second embodiments, the main body is detachable and swingable, but the main body can be fixed to the lift bracket so as not to be detachable by welding. Moreover, in the said 1st, 2nd embodiment, although the guide member showed the example provided with a main-body part and a contact member, it is a single rectangular parallelepiped block which was provided with the flat surface and formed with the metal of lower hardness than an inner mast. A guide member can be constructed and attached to the lift bracket.

  The present invention is not limited to the above-described embodiment, and can be changed without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Lift bracket 2 Fork 3 Finger bar 7 Inner mast 10, 10A Guide member 11, 11A Flat surface 12, 12A Main body part 13, 13A Contact member 14 Shaft hole 18 Shim 20, 21 Lock nut 22 Male screw part 23 Long hole 24 Through Hole

Claims (4)

A lift bracket, and a guide member attached to the lift bracket to prevent the inner mast from rolling,
The guide member has a flat surface capable of sliding contact with the side surface of the inner mast,
The flat surface is formed of a metal material having a lower hardness than the inner mast ,
The guide member is swingably attached to a shaft portion that is provided on the lift bracket so as to be parallel to the flat surface and horizontally.
The guide member includes a main body portion attached to a lift bracket, and a contact member detachably attached to the main body portion and having the flat surface,
The main body portion has a shaft hole through which the shaft portion protruding from the lift bracket can be inserted, and a male screw portion extending radially outward from the outer peripheral surface,
The contact member has a long hole that can accommodate the main body portion and a through hole that communicates with the long hole and allows the male screw portion to be inserted, and is flat on the opposite side of the through hole through the long hole. Has a surface,
An apparatus for preventing a roll from rolling according to claim 1, further comprising a lock nut that is screwed into the male screw portion and fixes the contact member to the male screw portion .   The apparatus according to claim 1, wherein the guide member is detachably attached to the lift bracket.   2. The apparatus according to claim 1, wherein the guide member is attached to the lift bracket so that a relative position with the inner mast can be adjusted. The lift bracket has a pair of left and right, and both of the guide member and the side roller can be attached to the shaft portion protruding from each of the pair of left and right lift brackets, and the shaft portion of one of the left and right lift brackets the guide member is mounted, antiroll device of the lift bracket according to any one of claims 1 to 3, wherein the side rollers to the left or right other lifting bracket, characterized in that it is mounted on.

Images