JP3447633B2 - Counterbalance type forklift - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a counterbalance type forklift capable of making small turns. 2. Description of the Related Art FIG. 7 shows an example of a counterbalance type forklift. This means that a fork 3 is arranged at the front of the vehicle body 1 via a mast 2 so as to be able to move up and down.
A counterweight 4 for balancing the weight with the load lifted by the fork 3 is attached to the rear of the vehicle body 1. Reference numeral 6 denotes an operation unit including a steering handle 6a and the like, and reference numeral 7 denotes a driver's seat arranged on the battery box 8. Conventionally, the counterweight 4 is made of a casting, and as shown in FIGS. 8 to 10, a pair of left and right through holes 10 penetrating through the counterweight 4 is
The connector bolt 11 is fixed to the vehicle body 1 by being fitted to a pair of left and right connection bolts 11 protruding from a, and screwing a nut 12 to each of the connection bolts 11. A draw bar 14 is cast into a concave portion 13 formed in the center of the lower portion of the outer peripheral surface of the counterweight 4.
By hooking the hook 15 with a and winding up the wire 15a, the forklift is pulled up to eliminate derailing (see the phantom line in FIG. 9). [0005] Even if an excessive tensile force is applied to the draw bar 14, the thickness t1, t2 of the counterweight 4 near the draw bar 14 is enough to withstand the excessive tensile force.
And a lower portion of the counterweight 4 is connected to a bracket 17 extending from the vehicle body 1 via a shim 18 by a pair of left and right connecting members 16 composed of bolts and nuts. [0006] In the above conventional configuration,
The thickness t1, near the drawbar 14 of the counter weight 4,
Since t2 is large, the width H of the counterweight 4 in the front-back direction is also large, and the turning radius of the forklift is large, so that the small turn cannot be made. Also, since the counterweight 4 cannot be securely attached to the vehicle body 1 with only the pair of left and right connection bolts 11, the pair of left and right connection members 1
6, the number of parts required for connection increases, and the manufacturing cost is high. Further, in order to absorb the casting error of the counterweight 4, the counterweight 4
The gap is adjusted by inserting a shim 18 of a predetermined thickness between the bracket 17 and the bracket 17, and the adjustment of the gap is troublesome because it takes time and effort. SUMMARY OF THE INVENTION [0007] In view of the above-mentioned conventional disadvantages, an object of the present invention is to provide a counterbalance type forklift capable of easily turning a counterweight with a small number of parts and a small number of parts. In order to achieve the above object, according to the first aspect of the present invention, a counterweight for balancing the weight with a load lifted by a fork is attached to a rear portion of a vehicle body. In a counterbalance type forklift, a drawbar is fixed to the vehicle body, a drawbar hole is formed in the counterweight so as to face the drawbar, and a rear frame projecting rearward from the vehicle body is provided. The counter weight is placed on the upper part, and the draw bar is formed so as to be adjustable in height by screwing a male screw part provided in the draw bar with a female screw part provided in the rear frame, and the top part of the draw bar is formed. It is characterized in that it is pressed against the counterweight. In the above configuration, for example, at the time of derailing, the hook with a wire is hooked on the drawbar fixed to the vehicle body through the drawbar hole of the counterweight, and the wire is wound up, thereby lifting the forklift to eliminate the derailing. Can be. In this case, since the drawbar is fixed to the vehicle body and the drawbar is not fixed to the counterweight as in the prior art, the width of the counterweight in the front-rear direction can be reduced, thereby reducing the turning radius of the forklift. It can be made smaller to make it easier to turn. Further, according to the above configuration, in addition to the function of engaging the hook or the like which is the original function of the drawbar, the height of the drawbar is adjusted and the top is pressed against the counterweight to reduce the counterweight. It also has the function of fixing it to the rear of the vehicle, making it practical. 1 to 4 show a counterbalance type forklift according to a first embodiment of the present invention, in which a rear frame 21 projecting rearward from a vehicle body 1 is provided. The counter weight 4 is mounted on the rear frame 21, the draw bar 14 is fixed to the rear frame 21, and a connecting mechanism 22 for connecting the counter weight 4 is provided at the rear of the vehicle body 1. . Since the configuration other than the above is substantially the same as the configuration shown in FIGS. 7 to 10, the same portions are denoted by the same reference numerals and description thereof will be omitted. According to the above configuration, the drawbar 14 is fixed to the vehicle body 1 side, and the drawbar 14 is not fixed to the counterweight 4 as in the prior art. Therefore, the width h of the counterweight 4 in the front-rear direction is reduced. This makes it possible to reduce the turning radius of the forklift and to make a small turn. The counterweight 4 is made of a casting, and a storage hole 25 for storing a controller 24 composed of various electronic devices is formed through an upper portion 4a of the counterweight 4 at a position opposed to the draw bar 14 at a lower portion 4b of the weight. A draw bar hole 26 is formed through the draw bar 14. For example, at the time of derailing, the hook 15 with the wire 15 a is hooked on the draw bar 14 through the draw bar hole 26, and the wire 15 a is wound up, thereby lifting the forklift to eliminate the derailing. (See FIG. 2). FIG.
Reference numeral 27 denotes a cover detachably attached to the opening of the storage hole 25. The rear end of the rear frame 21 has a body 1
A frame body 21a having a substantially U-shaped cross section fixed to the
A horizontal support plate 21b is provided on the top surface of the front end of the frame body 21a, and the concave ceiling surface 28 of the counter weight 4 is in contact with the horizontal support plate 21b. The connecting mechanism 22 has a pair of right and left cross-sectionally U-shaped vertical bars 22a fixed to the rear surface 1a of the vehicle body 1 at a predetermined interval, and is fixed to the upper end of each of the vertical bars 22a and extends rearward. A pair of left and right connecting bolts 22b is provided, and a pair of right and left standing portions 29 is protruded in the storage hole 25 so as to face the connecting bolts 22b.
After fitting 9a to each connecting bolt 22b, the counterweight 4 can be fixed to the vehicle body 1 by screwing a nut 22c to each connecting bolt 22b. As shown in FIG. 4, the controller 24 is fixed to a bracket 30 fixed to each vertical rod 22a by a fixture 31 such as a bolt and a nut. According to the above configuration, the through hole 29a of each upright portion 29 can be easily positioned with respect to each connecting bolt 22b simply by placing the counterweight 4 on the rear frame 21. Since the weight of the counterweight 4 is supported by the vehicle body 1 via the rear frame 21,
A connecting mechanism 22 for connecting the counterweight 4 to the vehicle body 1
As compared with the prior art, it is possible to use a device having a smaller number of parts and a lower manufacturing cost. Further, the upper and lower ends of the draw bar 14 are fixed to the tip of the bottom plate of the frame body 21a and the horizontal support plate 21b, and the draw bar 14 projects rearward from the vehicle body 1. Etc. can be easily engaged. FIG. 5 shows a main part of a counterbalance type forklift according to a second embodiment of the present invention. The drawbar 14 is formed of a bolt, and the male screw portion 14a is formed in a through hole of a horizontal support plate 21b. Is screwed into a fixing nut (female screw portion) 33 fixed to the frame main body 21a through the shaft, so that the height of the draw bar 14 can be adjusted.
8 Reference numeral 34 denotes a lock nut. Since the configuration other than the above is almost the same as that of the first embodiment shown in FIGS. 1 to 4, the same reference numerals are given to the same portions and the description thereof will be omitted. According to the above configuration, in addition to the function of engaging the hook 15 and the like, which is the original function of the draw bar 14,
By adjusting the height of the draw bar 14 and pressing the top of the draw bar 14 against the recessed ceiling surface 28 of the counter weight 4, the draw bar 14 has a function of fixing the counter weight 4 to the rear portion of the vehicle body 1, which is practical. FIG. 6 shows a main part of a counterbalance type forklift according to a third embodiment of the present invention. A pair of left and right interval adjusting members 36 made of bolts are connected to through holes of the horizontal support plate 21b. The gap adjusting member 36 is screwed into a fixing nut 33 fixed to the frame main body 21 a through the gap, and the top of each spacing adjusting member 36 is pressed against the concave ceiling surface 28 of the counter weight 4. Structures other than those described above are substantially the same as those of the first and second embodiments shown in FIGS. According to the above construction, the counterweight 4 can be securely fixed to the vehicle body 1 by pressing both the gap adjusting members 36 against the recessed ceiling surface 28 of the counterweight 4, and the shim 18 It is not necessary to adjust the interval using (see FIG. 8), and the interval adjustment operation can be easily performed. According to the first aspect of the present invention, since the drawbar is fixed to the vehicle body and the drawbar is not fixed to the counterweight as in the prior art, the width of the counterweight in the front-rear direction can be improved. Can be reduced, thereby making it possible to reduce the turning radius of the forklift and make a small turn. In addition to the drawbar's original function of engaging a hook or the like, the drawbar is adjusted to a height and its top is pressed against the counterweight to fix the counterweight to the rear of the vehicle body. It also has the function of performing, and is practical.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a main part of a counterbalanced forklift according to a first embodiment of the present invention. FIG. 2 is a horizontal sectional view of the main part. FIG. 3 is a rear view of the main part. FIG. 4 is an exploded perspective view of the main part. FIG. 5 is a longitudinal sectional view of a main part of a counterbalanced forklift according to a second embodiment of the present invention. FIG. 6 is a cross-sectional view of a main part of a counterbalanced forklift according to a third embodiment of the present invention. FIG. 7 is a side view of the counterbalance type forklift. FIG. 8 is a partially cutaway side view of a main part showing a conventional example. FIG. 9 is a plan view of the main part. FIG. 10 is a rear view of the main part. [Description of Signs] 1 Body 3 Fork 4 Counterweight 14 Drawbar 14a Drawbar male thread 21 Rear frame 26 Drawbar hole 33 Fixing nut (female thread) 36 Interval adjustment member

Claims (1)

(1) A counterbalance type forklift in which a counterweight for balancing weight with a load lifted by a fork is attached to a rear portion of a vehicle body, a drawbar is fixed to the vehicle body. A drawbar hole is formed in the counterweight so as to face the drawbar, and a rear frame projecting rearward from the vehicle body is provided, and the counterweight is mounted on the rear frame. The drawbar is formed so as to be adjustable in height by screwing a male screw portion provided on the drawbar with a female screw portion provided on the rear frame,
A counterbalance type forklift, wherein the top of the drawbar is pressed against a counterweight.