JP5843385B2 - Full free mast equipment - Google Patents

Description

  The present invention relates to an improvement of a full free mast device equipped in a cargo handling vehicle such as a forklift.

  Conventionally, as this kind of full free mast apparatus, what was described in patent documents 1-3, for example and was shown in FIG.9 and FIG.10 is known.

  The full free mast device 50 is basically suspended from a fixed mast 51, a movable mast 52 that can be raised and lowered relative to the fixed mast 51, a carriage 53 that can be raised and lowered relative to the movable mast 52, and the carriage 53. A pair of left and right forks 54, a pair of left and right lift cylinders 55 that raise and lower the movable mast 52 with respect to the fixed mast 51, and a pair of left and right frees that raise and lower the carriage 53 with respect to the movable mast 52 via a chain wheel and a lift chain. A lift cylinder 56.

  The movable mast 52 is provided on the left and right frame members 57, an appropriate connecting member 58 for connecting the two frame members 57 (for example, upper, middle and lower), and a free lift cylinder 56 provided on the outer middle of both frame members 57. And left and right cylinder supports 59 are provided.

  Thus, in such a configuration, a pair of left and right free lift cylinders 56 are provided on the left and right outer sides of the movable mast 52, and other than the upper one of the connecting members 58, for example, a rear vertical plate By only forming the carriage 53, the carriage 53 can be inserted from below the movable mast 52 without any trouble.

  However, in such a case, when the free lift cylinder 56 is actuated, as shown by a chain line in FIG. 9, the lower part (particularly, the lower front side) of each frame member 57 of the movable mast 52 is bent inward to increase the strength. In addition to problems, there was a risk of raising and lowering the carriage 53.

  By the way, Patent Document 1 describes that a lower connecting member of a movable mast is formed in a horizontal plate shape having a size including both frame members and a front side thereof.

  However, in such a case, since the lower connecting material is formed in a horizontal plate shape, it is possible to prevent the lower part of the movable mast from being bent, but it is not possible to insert the carriage from below the movable mast and the assembly is not easy. It was.

  Further, since the four hydraulic cylinders, that is, the pair of left and right lift cylinders 55 and 55 and the pair of left and right free lift cylinders 56 and 56 are driven, the hydraulic piping formed by a flexible hose or the like becomes complicated and the assembly thereof is difficult. In addition to being complicated, there is a problem that the hydraulic piping that extends in a complicated manner hinders the operator's view.

No. 7-9910 JP-A-10-152300 Japanese Patent No. 3348638

  The present invention was devised in view of the above-mentioned problems, and was devised to solve this problem. The problem is not only to prevent the lower part of the movable mast from being bent at the time of load, but also from the lower side of the movable mast. The main object of the present invention is to provide a full-free mast apparatus that can insert a carriage so that assembly can be easily performed, and that can easily assemble hydraulic piping and can improve the obstruction of visibility due to the hydraulic piping.

  To achieve the above object, a full free mast apparatus according to the present invention includes a fixed mast, a movable mast that can be moved up and down along the left and right inner surfaces of the fixed mast, and a carriage that can be moved up and down along the front surface of the movable mast. And a pair of left and right hydraulic lift cylinders disposed behind the fixed mast to raise and lower the movable mast, and a cylinder support connected to the movable mast and disposed on the left and right outer sides of the fixed mast. A pair of left and right hydraulic free lift cylinders for raising and lowering the carriage, and detachably provided at the lower part of the movable mast, so that the carriage can be inserted from below the movable mast, and the lower part of the movable mast is inward left and right A bend preventing body for preventing the bend, and the lift cylinder is provided with a hydraulic oil chamber in the cylinder and a lock provided at the tip of the rod. An oil passage communicating with the tip port is formed inside the rod, and one end of the hydraulic pipe for supplying hydraulic oil to the free lift cylinder is connected to the rod tip port, and extends from the rod tip port to above the fixed mast. It extends up and down along the front surface of the fixed mast, and the other end is connected to a hydraulic oil port below the free lift cylinder.

  The hydraulic pipe is formed by a rigid pipe having a predetermined length of a portion arranged above the fixed mast and a portion extending vertically along the front surface of the fixed mast and extending to the portion. It is preferable that a portion other than the tube is formed of a flexible tube, and the rigid tube is supported by a bracket fixed to the movable mast.

  The bending prevention body includes a fixed plate that is fixed to the lower portion of the movable mast and allows the carriage to be inserted, a left and right movable plate that is movably provided on the fixed plate and is inserted into the frame of the movable mast, and the fixed plate It is preferable that a fastening means for detachably fastening the movable plate is provided. In this way, since only the movable plate is detachably attached to the fixed plate, the strength of the movable mast can be improved by the amount of the fixed plate.

  It is preferable to provide a moving means for moving the movable plate in the direction of the frame of the movable mast with respect to the fixed plate. In this way, the movable plate can be reliably pressed against the frame material of the movable mast by the moving means. As a result, it is possible to further prevent the lower part of the frame member of the movable mast from being bent inward.

  The moving means is engaged with a screw hole plate that is suspended from a lower surface near the center of the fixed plate and has a screw hole, and is screwed into the screw hole plate to the inner end in the left-right direction of the movable plate. It is preferable to include a bolt to be obtained and a nut to be screwed onto the bolt.

  According to the present invention, the movable mast, the free lift cylinder, the carriage, and the bending prevention body are configured. In particular, the lower part of the movable mast is detachably provided with the bending prevention body that prevents the bending to the left and right inside. Sometimes, not only can the bending of the lower part of the movable mast be prevented, but also the carriage can be inserted from the lower side of the movable mast for easy assembly. In addition, since the bending prevention body that prevents the bending to the left and right inside is only detachably provided at the lower portion of the movable mast, the structure is extremely simple and can be easily applied to existing ones. Furthermore, the hydraulic piping of the free lift cylinder that raises and lowers the carriage is connected to an internal oil passage that passes through the piston rod of the lift cylinder and extends up and down along the front surface of the fixed mast over the fixed mast, Does not interfere with visibility. Moreover, it becomes easy to assemble with a rigid tube.

It is a front view which shows the principal part of the full free mast apparatus of this invention. It is a side view of FIG. It is a rear view of FIG. It is a top view of FIG. It is a bottom view of FIG. It is a perspective view of the movable mast which is a component of the full free mast apparatus of FIG. It is a conceptual diagram which shows the hydraulic fluid path | route of the lift cylinder and free lift cylinder which comprise the full free mast apparatus of FIG. It is a perspective view of the forklift in which the full free mast apparatus of FIG. 1 was integrated. It is a front view which shows the principal part of the conventional full free mast apparatus. FIG. 10 is a plan view of FIG. 9.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 8, the full free mast device 1 is composed of a movable mast 2, a carriage 3, a free lift cylinder 4, and a deflection preventing body 5, and the main part thereof is installed in a cargo handling vehicle such as a forklift. Applied to full free mast equipment.

  The full free mast device 1 is basically suspended from a fixed mast 6, a movable mast 2 that can be raised and lowered relative to the fixed mast 6, a carriage 3 that can be raised and lowered relative to the movable mast 2, and the carriage 3. A pair of left and right forks F (FIG. 8), a pair of left and right lift cylinders 7 disposed behind the fixed mast 6 to move the movable mast 2 up and down, and a carriage 3 up and down with respect to the movable mast 2 A pair of left and right free lift cylinders 4, a pair of left and right chain wheels 8 rotatably provided on the rod side of the free lift cylinder 4, and a movable mast 2 and a carriage 3. A pair of left and right lift chains 9 are provided.

  The full free mast device 1 is provided on the front side of the vehicle body (FIG. 8) of the cargo handling vehicle, and is provided with a fixed mast 6 that can be tilted back and forth with respect to the vehicle body, and a movable mast 2 that can be raised and lowered relative thereto. It is a so-called two-stage mast provided with a tilting back and forth by a tilt cylinder (not shown) provided between the vehicle body and the fixed mast 6.

  The movable mast 2 includes left and right frame members 10, an upper connecting member 11 that connects upper portions of both frame members 10, a middle connecting member 12 that connects the middle portions of both frame members 10, and both frame members 10. Are provided with a lower connecting member 13 for connecting the lower members, and left and right cylinder supports 14 provided on the outer middle of both frame members 10 to support one end of the free lift cylinder 4 and the lift chain 8.

  The cylinder support 14 extends from the movable mast 2 to the left and right sides, extends from the fixed mast 6 to the left and right sides in a wing shape, and extends from the wing plate 14 a to the left and right sides of the fixed mast 6. And a horizontal plate 14b (FIG. 2) extending horizontally toward the rear. The free lift cylinder 4 and the chain anchor 9a for connecting and supporting the lift chain 9 are fixed to the horizontal plate 14b.

  The free lift cylinder 4 and the chain anchor 9a are fixed at positions where the moments M1 and M2 (FIG. 2) of the forces acting on each of them by the load of the carriage 3 cancel each other. As a result, the bending of the horizontal plate 14b due to the (loading) load of the carriage 3 transmitted through the lift chain 9 is reduced.

  Each frame member 10 has a substantially J-shaped cross section, and the upper coupling member 11 has a box shape depending on a front vertical plate, an upper horizontal plate, and a rear vertical plate. The middle connecting plate 12 and the lower connecting plate 13 are formed only by the rear vertical plate.

  A pair of left and right free lift cylinders 4 are provided on the left and right outer sides of the movable mast 2, and the middle connecting plate 12 and the lower connecting plate 13 excluding the upper connecting member 11 are formed by only the rear vertical plate. Thus, there is no problem in inserting the carriage 3 from below the movable mast 2.

  Although not shown, a roller (an end roller or a side roller) is provided between the fixed mast 6 and the movable mast 2 to smoothly move the movable mast 2 up and down with respect to the fixed mast 6.

  The carriage 3 includes left and right lift brackets 15 that can move up and down with respect to the movable mast 2, finger bars 16 attached to the front side of the brackets, and left and right forks F (FIG. 8) suspended from the lift bars. .

  Although not shown, the lift bracket 15 is provided with rollers (end rollers and side rollers) for smoothly moving up and down the movable mast 2.

  The bending prevention body 5 is detachably provided at the lower part of the movable mast 2 to prevent the lower part of the movable mast 2 from bending inwardly in the left and right directions. In this example, the bending prevention body 5 is fixed to the lower part of the movable mast 2 and A fixed plate 17 that allows insertion of the movable plate 18, a left and right movable plate 18 that is movably provided on the fixed plate 17 and is inserted into the frame 10 of the movable mast 2, and the movable plate 18 is attached to and detached from the fixed plate 17. Fastening means 19 that can be fastened and moving means 20 for moving the movable plate 18 toward the frame 10 of the movable mast 2 with respect to the fixed plate 17 are provided.

  The fixed plate 17 has a horizontal plate shape and is fixed to the front center of the lower connecting member 13 of the movable mast 2. A space A through which the lift bracket 15 and the roller of the carriage 3 can pass is formed between the fixed plate 17 and the frame material 10 of the movable mast 2, so that the carriage 3 can be moved from below the movable mast 2. Insert and assemble.

  The movable plate 18 also has a horizontal plate shape, and is overlapped with the lower side of the fixed plate 17 so that the outer ends in the left-right direction are inserted into the frame member 10 of the movable mast 2 to be fitted.

  The fastening means 19 includes a plurality of long holes 21 (six on each side) that are formed in the fixed plate 17 and a plurality of holes that are formed in the movable plate 18 and communicate with the long holes 21 (a total of six). ) Through holes 22, bolts 23 inserted therethrough, and nuts (double nuts) 24 screwed into the bolts 23.

  The moving means 20 includes a screw hole plate 25 that is suspended from the lower surface near the center of the fixed plate 17 and has a screw hole, and a bolt that can be screwed to the inner end in the left-right direction of the movable plate 18. 26 and a nut (lock nut) 27 to be screwed thereto.

  As schematically shown in FIG. 9, the lift cylinder 7 has a rod-side oil chamber 7b and an anti-rod-side oil chamber 7c on both sides of a piston 7a in the cylinder chamber, and a bottom port 7d provided at the bottom of the cylinder is anti-reverse. The rod-side oil chamber 7c communicates with the piston 7a so as to communicate with the oil chambers 7b, 7c, and an internal oil passage 7g formed inside the rod 7f is connected to the anti-rod-side oil chamber. 7c communicates with a rod tip port 7h provided at the tip of the rod 7f.

  The hydraulic pipes 30 connected to the rod end ports 7h and 7h of the left and right lift cylinders 7 and 7 extend to the left and right sides so as to cross along the back surface of the upper coupling member 11 as shown in FIG. 1, 2, and 8, the horizontal direction extends above the fixed mast 6 along the left and right side surfaces of the upper end portion of the movable mast 2. Further, as shown in FIGS. 1 and 8, the movable mast 2 Are extended in the vertical direction along the right and left side surfaces and the front surface of the fixed mast 6, and are connected to the hydraulic oil port 4 a below the free lift cylinder 4.

  The hydraulic pipe 30 has a predetermined length of a portion arranged above the fixed mast 6 and a portion extending up and down along the front surface of the fixed mast 6 connected to the upper arranged portion, and has a rigidity such as a metal pipe. A portion other than the rigid tube is formed by a flexible tube. In the illustrated example, a space between the joint 30a and the joint 30b shown in FIG. 2 is a rigid tube. The rigid tube is supported by a bracket 31 fixed to the movable mast.

  Next, the operation will be described based on the above configuration.

  Since the movable plate 18 of the deflection preventing body 5 is detachably attached to the fixed plate 17, it can be attached to or detached from the fixed plate 17.

  As shown in FIGS. 1 and 5, when the movable plate 18 of the anti-bending body 5 is attached to the fixed plate 17, the movable plate 18 is overlaid on the lower side of the fixed plate 17 and the bolt 23 and the nut 24 of the fastening means 19. The left and right outer ends are inserted into the frame 10 of the movable mast 2 and pressed by the screw hole plate 25 and the bolt 26 of the moving means 20. The pressing force can be adjusted by the screwing of the bolt 26 of the moving means 20.

  Then, even when the free lift cylinder 4 is actuated, the bend prevention body 5 including the fixed plate 17 and the movable plate 18 exists between the left and right frame bodies 10 of the movable mast 2. The lower part of the mast 2 is prevented from bending inward. For this reason, there is no possibility that the raising and lowering of the carriage 3 guided by the movable mast 2 may be hindered.

  As shown in FIG. 6, when the movable plate 18 of the deflection preventing body 5 is removed from the fixed plate 17, the space A is formed between both the frame members 10 of the movable mast 2 and the stationary plate 17 of the deflection preventing body 5. Thus, the lift bracket 15 and the roller of the carriage 3 can be passed through the space A. For this reason, the carriage 3 can be inserted from below the movable mast 2.

  When the hydraulic oil is supplied to the lift cylinder 7 through the bottom port 7d in a state where the piston rod of the lift cylinder 7 and the piston rod of the free lift cylinder 4 are not extended, the supplied hydraulic oil is shown in FIG. The anti-rod side oil chamber 7c in the lift cylinder 7 flows into the rod side oil chamber through the through hole 7e of the piston 7a and is supplied to the free lift cylinder 4 through the internal oil passage 7g and the hydraulic pipe 30 in the rod 7f. . In the piston 7a of the lift cylinder 7, the difference between the pressure receiving area of the rod side oil chamber 7b and the pressure receiving area of the non-rod side oil chamber 7c becomes a pressure receiving area for operating (raising) the piston 7a. Smaller than the area. Therefore, after the piston rod 4c of the free lift cylinder 4 has been raised to the upper limit of the stroke, the piston rod 7f of the lift cylinder 7 starts to rise.

  As the piston rod 4c of the free lift cylinder 4 rises, only the carriage 3 rises. After the carriage 3 has been raised, that is, after the piston rod 4c of the free lift cylinder 4 has been raised, the piston rod 7f of the lift cylinder 7 is raised to raise the movable mast 2. At this time, since the movable mast 2 rises together with the piston rod 7f of the lift cylinder 7, the relative positional relationship between the piston rod 7f and the movable mast 2 remains unchanged, and the main part of the hydraulic pipe 30 can be formed of a rigid pipe. It can be done.

  The hydraulic piping 30 for the hydraulic oil supplied to the free lift cylinder 4 passes through the piston rod 7f of the lift cylinder 7 and then extends vertically above the fixed mast 6 and along the front surface of the fixed mast 6. Therefore, the hydraulic piping 30 does not obstruct the field of view. Further, by forming most of the hydraulic pipe 30 with a rigid pipe, the assembly is simplified and the working efficiency is improved.

  In addition, although the full free mast apparatus 1 was a two-stage mast in the previous example, it is not limited thereto, and may be a multi-stage mast having three or more stages, for example.

  In the previous example, the bending prevention body 5 is configured by a total of three of the fixed plate 17 and the movable plate 18, but is not limited thereto, and may be configured by a single number or a plurality other than three, for example.

  In the above example, the moving means 20 is constituted by the screw hole plate 25 and the bolt 26. However, the moving means 20 is not limited to this, and is formed between the fixed plate 17 and the movable plate 18, for example, depending on the fastening of the fastening means 19. The movable plate 18 may be configured with an inclined surface (wedge surface) that moves the movable plate 18 toward the frame 10 of the movable mast 2 with respect to the fixed plate 17.

  The lift cylinder 7 is a piston cylinder, but may be a plunger cylinder. Moreover, although the example in which the internal oil passage 7g in the piston rod of the lift cylinder 7 opens to the anti-rod side oil chamber 7c is shown, it may be opened to the rod side oil chamber 7b.

  DESCRIPTION OF SYMBOLS 1 ... Full free mast apparatus, 2 ... Movable mast, 3 ... Carriage, 4 ... Free lift cylinder, 5 ... Deflection body, 6 ... Fixed mast, 7 ... Lift cylinder, 8 ... Chain wheel, 9 ... Lift chain, 10 ... Frame material, 11 ... upper connection material, 12 ... middle connection material, 13 ... lower connection material, 14 ... cylinder support, 15 ... lift bracket, 16 ... finger bar, 17 ... fixed plate, 18 ... movable plate, 19 ... fastening Means, 20 ... Moving means, 21 ... Long hole, 22 ... Through hole, 23 ... Bolt, 24 ... Nut, 25 ... Screw hole plate, 26 ... Bolt, 27 ... Nut, 30 ... Hydraulic piping, 50 ... Full free mast device , 51 ... Fixed mast, 52 ... Movable mast, 53 ... Carriage, 54 ... Fork, 55 ... Lift cylinder, 56 ... Free lift cylinder, 57 ... Frame material, 58 ... Connecting material, 59 ... Sunda support, A ... space.

Claims (4)

With a fixed mast,
A movable mast capable of moving up and down along the left and right inner surfaces of the fixed mast;
A carriage that can be raised and lowered along the front surface of the movable mast;
A pair of left and right hydraulic lift cylinders disposed behind the fixed mast to raise and lower the movable mast;
A pair of left and right hydraulic free lift cylinders supported by a cylinder support connected to the movable mast and disposed on the left and right outer sides of the fixed mast;
A deflection preventing body that is detachably provided at a lower portion of the movable mast, and that allows the carriage to be inserted from below the movable mast and prevents the lower portion of the movable mast from bending inwardly to the left and right;
The lift cylinder has an oil passage formed in the rod that communicates the hydraulic oil chamber in the cylinder with the rod tip port provided at the rod tip.
The hydraulic piping for supplying the hydraulic oil to the free lift cylinder has one end connected to the rod tip port and extends vertically from the rod tip port to above the fixed mast along the front surface of the fixed mast. The end is connected to the hydraulic oil port below the free lift cylinder ,
The bend prevention body includes a fixed plate fixed to a lower portion of the movable mast and allowing the carriage to be inserted, and left and right movable plates that are movably provided on the fixed plate and inserted into the frame of the movable mast. And a full free mast device comprising fastening means for detachably fastening the movable plate to the fixed plate .   The pipe is formed by a rigid tube having a predetermined length of a portion arranged above the fixed mast and a portion extending vertically along the front surface of the fixed mast and extending to the portion. 2. The full free mast device according to claim 1, wherein the other portion is formed of a flexible tube, and the rigid tube is supported by a bracket fixed to the movable mast. The full free mast apparatus according to claim 1 , further comprising moving means for moving the movable plate toward the frame of the movable mast with respect to the fixed plate. The moving means is engaged with a screw hole plate that is suspended from a lower surface near the center of the fixed plate and has a screw hole, and is screwed into the screw hole plate to the inner end in the left-right direction of the movable plate. The full free mast device according to claim 3 , further comprising a bolt to be obtained and a nut screwed into the bolt.

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