JP2005162378A - Reach type fork lift and mounting method for mast assembly on reach leg - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reach type fork lift structured so that a mast 3 is supported on reach legs 2L and 2R through a carriage 5, capable of making shim adjustment of side rollers 24 of the carriage 5 simply and certainly. <P>SOLUTION: The carriage 5 furnished at the side face with the side rollers 24 is inserted to the reach legs 2L and 2R in the condition that a mast assembly 10 is not fixed, and the position of each side roller 24 is adjusted with a shim while abutting of the side roller 24 or its spacing to the guide surfaces of the reach legs 2L and 2R is monitored (Process 1). In the condition that the carriage 5 is supported by the reach legs 2L and 2R, the mast assembly 10 (the root side of the outer mast 3) is secured to the carriage 5 by bolts etc. (Process 2). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a configuration of a reach type forklift that has a wheel in front of the base of the fork and is capable of moving the fork back and forth during a cargo handling operation (reach operation).

  Reach-type forklifts generally have a structure in which a mast is supported on a reach leg via a carriage. Patent Document 1 discloses the configuration of the carriage, and as shown in FIG. 2, a carriage 1b is welded to a mast portion 1a (Patent Document 1 is attached to the carriage 1b as necessary. It is disclosed that the extension arm 2a can be attached with a bolt). Roller shafts 1c and 1d are fixed to the carriage 1b. With this configuration, a roller (carriage roller) (not shown) is supported on the roller shafts 1c and 1d, and can be inserted into a reach leg (not shown). Accordingly, the carriage 1b and the mast portion 1a welded thereto can be moved back and forth along the reach leg, thereby enabling the reach operation.

  The roller is a roller whose axis is horizontal (so-called carriage roller), but the carriage 1b is often provided with a roller (side roller) whose axis is directed vertically. An example of this configuration is shown in FIG. 5 as a plan view. FIG. 5 shows an example in which four carriage rollers 22 and side rollers 24 are provided on the front, rear, left and right of the carriage 5 in total. Although only the outer mast 3 is shown in FIG. 5, the inner mast, lift bracket, etc. (not shown) are already assembled in the outer mast 3.

  5, when the carriage 5 and the mast are inserted into the reach legs 2L and 2R, the side rollers 24 abut against the guide surfaces (vertical walls) 32 of the reach legs 2L and 2R and roll, The welded outer mast 3 and the like are guided in the front-rear direction. Similarly, the carriage roller 22 guides the carriage 5 and the outer mast 3 welded to the carriage 5 in the front-rear direction while rolling in contact with the guide surfaces (lateral walls) 31 of the reach legs 2L and 2R.

  In this configuration, if there is a large gap between the side roller 24 and the guide surface 32, rattling occurs and the reach operation is not performed smoothly. (Shim is not shown in FIG. 5). As an adjustment method, the actual distance between the guide surfaces 32 and 32 of the left and right reach legs 2L and 2R is measured, and then the number of shims to be inserted is determined by calculation, and the shim is inserted. It has been broken. Then, after the shim is inserted, the carriage 5 is inserted into the reach legs 2L and 2R as indicated by thick arrows in FIG.

Japanese Patent Laid-Open No. 51-158666 (Page 2, line 15)

  However, the shim adjustment method described above does not take into account variations (so-called individual differences) between the side rollers 24 and the fixing portions of the side rollers 24, so the number of shims calculated by calculation is not appropriate and the backlash is large. There was a risk of becoming. However, if you try to calculate the number of shims in consideration of such individual differences of each part, the time and effort of measuring each part will increase, and it will take time to adjust and cause an increase in cost. End up.

  Further, the left and right reach legs 2L and 2R (and thus the left and right guide surfaces 32 and 32) cannot be made completely parallel, and it is inevitable that a certain degree of inclination occurs due to an error in manufacturing. Therefore, the measured value depends on which part of the guide surface 32 is measured, and the number of shims cannot be determined appropriately, and there is a possibility that a large amount of play occurs.

  In order to adjust the shim, it is necessary to remove the side roller 24 from the carriage 5 with the carriage 5 removed from the reach legs 2L and 2R. Therefore, if the shim adjustment is not successful and the play becomes large as described above, the mast once supported by the reach legs 2L and 2R must be removed together with the carriage 5 in order to change the number of shims. Here, the mast (including the outer mast 3, the inner mast, the lift bracket, etc.) is a heavy object, and there is a thing whose weight increases to 1 ton. In addition, since the mast is a long object in the vertical direction, it is very difficult to remove it from the reach legs 2L and 2R or to reattach it while supporting it in a balanced manner. Therefore, it takes time and labor to mount the mast on the reach legs 2L and 2R, which increases the number of manufacturing steps.

  In addition, as shown in FIG. 6, a configuration in which the contact between the side roller 24 and the guide surface 32 can be adjusted without removing the carriage 5 from the reach legs 2L and 2R is also conceivable. 6 will be described. The front side roller 24 is supported by one end of an arm 61 that is pivotally supported in the middle. A screw shaft 62 is connected to the other end of the arm 61, and the screw shaft 62 passes through the side plate of the carriage 5, and a bolt 63 is screwed to the inner end side thereof. The rear side roller 24 is supported by a block 64 slidable inside the shaft of the carriage roller 22, and a screw shaft 65 is fixed to the block 64. The screw shaft 65 passes through the side plate of the carriage 5, and a bolt 66 is screwed to the inner end side thereof. Accordingly, as shown in FIG. 6, with the carriage 5 being inserted into the reach legs 2L and 2R, the bolts 63 and 66 are rotated from the inside of the carriage 5 to move the side rollers 24 and 24 through the screw shafts 62 and 65. The contact with the guide surface 32 or the gap can be adjusted.

  However, in the configuration as shown in FIG. 6, parts such as the arm 61, the screw shafts 62 and 65, and the bolts 63 and 66 are specially required, which complicates the configuration and greatly increases the manufacturing cost and the number of manufacturing steps. It becomes a factor.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  ◆ According to the first aspect of the present invention, there is provided a reach-type forklift configured as follows. The mast is supported on the reach leg via the carriage. A side roller is supported on the side surface of the carriage, and the side roller is adjusted in contact with or spaced from the guide surface of the reach leg by a shim. The outer mast is fixed to the carriage in a state where the carriage is supported by the reach leg.

  With this configuration, the carriage with the mast assembly (outer mast) not fixed is inserted into the reach leg, and the number of shims is adjusted by trial and error while actually moving back and forth to see the smoothness. Assembling methods such as assembling the outer mast can be adopted. Therefore, the actual number of shims can be adjusted, and a state where the reach operation is smooth can be obtained with certainty. Further, since it is not necessary to measure or calculate the distance between the guide surfaces or the so-called individual difference of the side rollers, adjustment during assembly is simplified. In addition, the number of shims is adjusted when the mass assembly, which is a heavy object, is not fixed to the carriage, so it is possible to easily attach and remove the carriage to and from the reach leg. Can be carried out easily and in a short time.

  According to the second aspect of the present invention, there is provided a method for assembling the mast assembly in the reach forklift in the reach leg, including the following steps. That is, a carriage having side rollers on the side surfaces is inserted into a reach leg, and the position of the side roller is adjusted by a shim while observing the contact or spacing of the side roller with respect to the guide surface of the reach leg (first step). Then, the mast assembly is fixed to the carriage with the carriage supported by the reach leg (second step).

  In this method, the carriage in a state where the mast assembly is not fixed can be inserted into the reach leg, and actually moved back and forth to adjust the number of shims by trial and error while checking the smoothness. Therefore, the actual number of shims can be adjusted, and a state where the reach operation is smooth can be obtained with certainty. Further, since it is not necessary to measure or calculate the distance between the guide surfaces or the so-called individual difference of the side rollers, adjustment during assembly is simplified. In addition, the number of shims is adjusted when the mass assembly, which is a heavy object, is not fixed to the carriage, so it is possible to easily attach and remove the carriage to and from the reach leg. Can be carried out easily and in a short time.

Next, embodiments of the invention will be described.
FIG. 1 is a side view showing a configuration of a reach leg, a carriage, and a mast assembly in a forklift according to an embodiment of the present invention. FIG. 2 is also a plan sectional view.
FIG. 3A is an enlarged rear view of the main part of the carriage roller, and FIG. 3B is an enlarged rear sectional view of the main part of the side roller. FIG. 4 is a side view showing how the mast assembly is fixed to the carriage after shim adjustment.

  In this embodiment, the outer mast 3, inner mast (not shown), middle mast (not shown), lift bracket (not shown), lift cylinder 4, etc. are assembled prior to assembling the mast to the reach legs 2L and 2R of the reach type forklift. , And mast assembly 10. The mass assembly 10 is assembled in a state where a carriage 5 described later is removed. A cylinder support 11 for fixing and supporting the lower end of the lift cylinder 4 is fixed to the outer mast 3 by welding.

  Reach legs 2L and 2R are provided one on each of the left and right sides (see FIG. 2), and protrude in parallel with each other in front of the forklift vehicle. Front wheels 8 are supported at the front ends of the reach legs 2L and 2R. The reach legs 2L and 2R are formed with guide surfaces 31 and 32 which can come into contact with a carriage roller 22 and side rollers 24 described later.

As shown in FIG. 2, the carriage 5 is constructed by integrally connecting left and right side plates 5L and 5R with a connecting body 5C by welding. As shown in FIG. 1, four bolt holes 9 are formed in each of the side plates 5L and 5R. As shown in FIG. 2, two tapped holes 12 are formed in the connecting body 5C. On the other hand, as shown in FIG. 1, a tap hole 12 is formed in the outer mast 3 at a position corresponding to the bolt hole 9 of the side plates 5L and 5R. Moreover, as shown in FIG. 2, the bolt hole 9 is formed in the position corresponding to the tap hole 12 of the said connection body 5C.
That is, the carriage 5 is configured not to be fixed to the outer mast 3 (and thus the mast assembly 10) by welding as in the prior art, but can be fixed by a bolt (not shown).

  A total of four carriage roller shafts 21 are fixed to the side plates 5L and 5R of the carriage 5 in two. The carriage roller shaft 21 is disposed in front of and behind the side plates 5L and 5R, and a carriage roller 22 is supported on each of the side plates 5L and 5R with its axis line oriented in the lateral direction. The carriage roller 22 is configured to be able to roll while being in contact with a guide surface 31 (lateral wall, see FIG. 2) formed on the reach legs 2L and 2R.

  In addition, two side roller shafts 23 are fixed to the side plates 5L and 5R of the carriage 5, for a total of four. The side roller shafts 23 are disposed in front of and behind the side plates 5L and 5R, and the side rollers 24 are supported by the side roller shafts 23 with their axis lines directed in the vertical direction. The side roller 24 is configured to be able to roll while contacting a guide surface 32 (vertical wall, see FIG. 2) formed on the reach leg.

  FIG. 3A shows an enlarged view of the main part of the rear view of the carriage roller 22. As shown in FIG. 3A, the carriage roller shaft 21 is formed in a step shape, and a shim 50 is sandwiched between the base portion and the carriage roller 22. The shim 50 is an annular plate having two types of thicknesses of 0.5 and 1.0 millimeters. By changing the number of shims 50 mounted and the thickness of the mounted shims 50, the right and left sides of the carriage roller 22 are changed. The position can be adjusted in 0.5 millimeter increments. However, the thickness of the shim 50 is not limited to the above.

  FIG. 3B shows an enlarged view of the main part of the rear view of the side roller 24. As shown in FIG. 3B, the side roller 24 is provided so as to be partially immersed in the through groove 7 provided in the side plates 5L and 5R. The upper and lower ends of the side roller shaft 23 that supports the side roller 24 are fastened to the side plates 5L and 5R of the carriage 5 by bolts b. A shim 50 is sandwiched between the side roller shaft 23 and the side plates 5L and 5R. By changing the number of shims 50 mounted, the lateral position of the side roller shaft 23 (and thus the side roller 24) can be adjusted, and the distance g between the side roller 24 and the guide surface 32 can be adjusted. The optimum value of the gap g varies depending on conditions, but if it is too large, the carriage 5 and the mast will be laterally loosened. For example, it can be considered that the distance g is adjusted to 0 to 0.5 mm.

  In this embodiment, first, only the carriage 5 (that is, the carriage 5 in a state where the mast assembly 10 is not fixed) is inserted into the reach legs 2L and 2R as shown by thick arrows in FIGS. Make sure that it moves back and forth (reach operation). If there is a large back and forth play, remove the carriage 5 from the reach legs 2L and 2R again, remove the bolts b in FIG. 3B, increase the number of shims 50, or change to a thicker one. . On the other hand, if a catch occurs when moving back and forth, the carriage 5 may be removed from the reach legs 2L and 2R to reduce the number of shims 50 shown in FIG. After changing the number and thickness of the shims 50, the carriage 5 is inserted into the reach legs 2L and 2R again to check whether the reach operation has been performed smoothly.

  After confirming that the carriage 5 moves smoothly with respect to the reach legs 2L and 2R in this way, the mast assembly 10 is mounted next time. Specifically, the base portion of the mast assembly 10 (outer mast 3) is fastened with bolts to the carriage 5 that is supported by the reach legs 2L and 2R. The bolt is screwed into the tap hole 12 after passing through the bolt hole 9. Thus, the mast assembly 10 is supported by the reach legs 2L and 2R via the carriage 5.

  As shown above, the carriage 5 in a state where the mast assembly 10 is not fixed is inserted into the reach legs 2L and 2R, and is actually moved back and forth to adjust the number of shims 50 by trial and error while checking the smoothness. As described above, more practical adjustment is possible than when the number of shims 50 is determined by measurement and calculation, and a state where the back-and-forth movement is smooth can be obtained with certainty. Further, since it is not necessary to measure the distance between the guide surfaces 32 and 32 and the dimensions of each component (side roller), adjustment during assembly is also simplified.

  This trial and error shim adjustment has the following effects. That is, even if the parallelism between the guide surfaces 32 and 32 of the reach legs 2L and 2R is not so much due to some reason such as a manufacturing error, the carriage 5 is actually caused to reach over the entire stroke, and the Since the shim adjustment is performed while checking whether or not there is an error, even if there is such an error in parallelism, it is possible to adjust the number of shims so that the carriage 5 can be operated smoothly.

  Further, since the adjustment of the number of shims 50 described above is performed in a state where the mast assembly 10 is not fixed to the carriage 5, the operation of inserting and removing the carriage 5 with respect to the reach legs 2L and 2R is not so difficult. Specifically, the mast assembly 10 is a vertically long object and may weigh up to about 1 ton, whereas the carriage 5 is relatively compact and weighs about 100 kilograms, for example. Therefore, shim adjustment by the trial and error described above can be performed easily and in a short time, and the number of man-hours during assembly can be reduced.

  Furthermore, since it is a simple configuration in which the bolt hole 9 and the tap hole 12 are simply provided in the carriage 5 and the outer mast 3, the above-described effects can be obtained without significantly increasing the number of manufacturing steps and the manufacturing cost.

In addition, the following incidental effects can also be acquired by setting it as the structure of this invention. In other words, in the reach fork type forklift, the inter-axis pitch of the carriage roller shaft 21 and the side roller shaft 23 is changed for each specification of the forklift (see the above-mentioned Patent Document 1). In this regard, according to the configuration of the present invention, only several types of carriages 5 having different inter-axis pitches are manufactured, and a plurality of types of mast carriages are easily manufactured by fixing them to the mast assembly 10 with bolts. can do.
Further, the number of parts can be reduced by assigning part numbers one by one at the stage of only the carriage 5 with different inter-axis pitches. In other words, when several types of carriages are manufactured with different inter-axis pitches and several types of masts are manufactured with different heads, the number of types of mast carriages to be combined becomes very large. Adding part numbers requires a large number of part numbers. In this respect, by assigning part numbers at the stage of the carriage only with different inter-axis pitches, it is not necessary to assign each part number to each combination, thus reducing management and storage labor. Can do.

  In the above embodiment, the shim adjustment of the side roller 24 has been described. However, it goes without saying that the shim adjustment of the carriage roller 22 can be performed simultaneously with the shim adjustment of the side roller 24. Further, the process of assembling the outer mast 3 or inner mast to form the mast assembly 10 may be performed after the shim adjustment of the side roller 24 of the carriage 5 is completed.

  Moreover, it may replace with providing the said tap hole 12, and the structure fastened with a volt | bolt and a nut may be sufficient. Further, the tap hole 12 may be formed at the position of the bolt hole 9 and the bolt hole 9 may be formed at the position of the tap hole 12 (that is, the formation positions of the tap hole 12 and the bolt hole 9 may be exchanged). ). In addition, the means for fixing the carriage 5 and the outer mast 3 is not limited to bolts. For example, it may be fixed with a pin or the like. In short, any configuration that can fix the carriage 5 to the root portion of the mast assembly 10 is sufficient.

The side view which showed the structure of the reach leg, the carriage, and the mast assembly in the forklift which concerns on one Embodiment of this invention. Similarly plane sectional view. (A) is a principal part enlarged rear view of a carriage roller, (b) is a principal part enlarged rear sectional view of a side roller. The side view which showed a mode that the mast assembly was fixed to a carriage after shim adjustment. The plane sectional view showing the situation of shim adjustment of the side roller in the prior art. The plane sectional view showing the composition which adjusts a side roller with a bolt instead of a shim.

Explanation of symbols

2L ・ 2R Reach Leg 5 Carriage 10 Mast Assembly 24 Side Roller 50 Shim

Claims (2)

A reach-type forklift that supports a mast on a reach leg via a carriage,
A side roller is supported on the side surface of the carriage, and the side roller is adjusted in contact with or spaced from the guide surface of the reach leg by a shim.
A reach-type forklift, wherein an outer mast is fixed to the carriage in a state where the carriage is supported by the reach leg. In the assembly method of the mast assembly in the reach forklift to the reach leg,
A carriage provided with side rollers on the side is inserted into the reach leg in a state where the mast assembly is not fixed, and the position of the side roller is adjusted by a shim while observing or contacting the side rollers with respect to the guide surface of the reach leg. The first step;
A second step of fixing a mast assembly to the carriage in a state where the carriage is supported by the reach leg;
Including assembly of the mast assembly to the reach leg.

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