JP2679538B2 - Lift cylinder support device for forklift - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lift cylinder supporting device for fixing an upper side of a lift cylinder to an outer mast in a forklift of a type in which lift cylinders are respectively arranged behind a pair of left and right masts.

[0002]

2. Description of the Related Art In a forklift of the type in which lift cylinders are respectively arranged behind the left and right masts, generally, the lift cylinder has its lower end supported by the lower beam of the outer mast, and the upper side of the lift mast is supported by a support tool. It is usually fixed to. Figure 4-
FIG. 6 shows an example of supporting the upper side of a conventional lift cylinder. Shown in FIG. 4 is a support type that utilizes a ring, which fits a support ring 22 to the cylinder top of a lift cylinder 21 and a ring holder 2
Bracket 25 in which 3 is fixed to the rear surface of the outer mast 24
It is configured to be fixed with a bolt 26 to the. Further, FIGS. 5 and 6 show a supporting type using U bolts 29. This is a method in which the seat member 28 is attached to the bracket 27 fixed to the rear surface of the outer mast 24, and the cylinder body of the lift cylinder 21 is fixed. U-bolt 2 with both ends inserted into the bracket 27 while receiving one side
9, the other side of the cylinder body is held, and the U bolt 29 is fastened with a nut 30.

[0003]

However, in the case of the support type by the ring shown in FIG. 4 mentioned above, the support ring 22 is provided on the cylinder top which is the maximum diameter of the lift cylinder 21.
Since this is a form in which the support ring 22 is fitted, the thickness of the support ring 22 is added to the cylinder top diameter, and the lift cylinder 21 becomes thick. Therefore, in order to avoid interference with the body side (head guard) at the time of tilting the mast backward, it is necessary to set a wide interval between the mast and the body. Therefore, the entire mast unit including the lift cylinder 21 must be set forward, and as a result, the allowable load of the vehicle is reduced. This is not limited to the example shown in FIG. 4, and even in the case of the U bolt support type shown in FIGS. 5 and 6, depending on the setting of the protrusion amount of the bracket 27, the same result is brought about. . Further, as shown in FIGS. 5 and 6, in the case of a specification vehicle having a mast pipe, the bracket 27 (or 25) protruding to the rear surface of the outer mast 24 pipes the hydraulic hose along the rear surface of the outer mast 24. It is a hindrance to the case. Therefore, conventionally, as shown in the drawing, the hose pulley 33 is attached to the upper tie beam 32 of the inner mast 31 located inside and above the lift cylinder 21, and the hydraulic hose 34 is piped inside the lift cylinder 21. The pipe causes a problem that the front view from the driver's seat is significantly obstructed.

In view of the above problems, the present invention allows the mast unit to be disposed closer to the body side, and when it is applied to a specification vehicle having a mast pipe, the pipe along the rear face of the mast of the hydraulic hose is installed. It is a technical problem to be solved to provide a lift cylinder support device for a forklift truck that enables it.

[0005]

Means for Solving the Problems In order to solve the above problems, the present invention is configured as follows. That is, a lift cylinder support device for fixing the left and right lift cylinder upper parts, which are respectively erected on the lower beams behind the pair of left and right masts, to the outer mast, and a pair of half halves each having a connecting piece at one end. A ring member, the two half ring members holding the cylinder body of the lift cylinder so as to sandwich it from both sides, the other ends are overlapped with each other, and the connecting pieces are brackets on the rear surface of the outer mast. The feature is that it is fastened to.

[0006]

In the cylinder support device according to the present invention constructed as described above, since the support member of the lift cylinder is composed of a pair of half ring members, the lift cylinder is held by the cylinder body from both sides. In the held state, the other ends are overlapped with each other, and the other end is fastened to the bracket on the outer mast side to support the lift cylinder. Therefore, even if the wall thickness of the cylinder support device is added to the diameter of the lift cylinder, it does not become thicker than the cylinder top, and the amount of rearward protrusion of the bracket can be set to the minimum necessary. It is effective in avoiding the interference with the side. In addition, when applying to a vehicle with a mast pipe, it is possible to secure a space through which the hydraulic hose can pass by keeping the amount of protrusion of the bracket rearward as small as possible. Piping along the rear surface of the mast while straddling the lift cylinder is achieved.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. First, the first embodiment shown in FIG. 1 will be described. The first embodiment is an example applied to a standard specification vehicle without a mast pipe, and FIG. 1 shows only the right side of the mast, and the left side is symmetrically configured, so that it is omitted. As shown in the figure, the lift cylinders 1, which are respectively arranged behind the left and right masts, have their lower ends supported by the lower beams (not shown) of the left and right outer masts 2, and the upper side of the support device according to the present embodiment. It is fixed to the outer mast 2 by.

The cylinder support device of the present embodiment comprises a substantially ring-shaped cylinder support member 3 for supporting the upper side of the cylinder body (cylinder tube) of the lift cylinder 1. The cylinder support member 3 has a half-circular ring member 4 having a connecting piece 4a having a hole at one end and having a substantially arc shape.
And a half ring member 5 having an approximately 1/2 arc shape and having a connecting piece 5a with a hole at one end. That is,
The pair of half-split ring members 4 and 5 are formed in a substantially symmetrical shape, and by coupling them in a face-to-face state, the cylinder support member 3
Is configured.

Therefore, the cylinder support member 3 is held by the half ring members 4 and 5 so as to sandwich the upper portion of the cylinder body of the lift cylinder 1 whose lower portion is supported by the lower beam of the outer mast 2 from the front-rear direction. . That is, the other ends of the half ring members 4, 5 are overlapped with each other inside the lift cylinder 1, and specifically, the end of the rear half ring member 5 is the end of the front half ring member 4. The connecting pieces 4a and 5a are overlapped with each other, and the connecting pieces 4a and 5a are screwed from the rear side through an elastic rubber ring 10 and a shim 6 for absorbing cylinder flexure to a bracket 8 fixed to the rear surface of the outer mast 2 on the outside. It is fastened by the bolt 9. Thus, the lift cylinder 1 is stably supported by the outer mast 2 while being held from the front and rear sides by the pair of half ring members 4 and 5. In the figure, 11 is an inner mast and 12 is its tie beam.

In the lift cylinder support device according to this embodiment, the cylinder main body is sandwiched and supported by the pair of half ring members 4, 5 from the front and back, and the half ring members 4, 5 are mutually supported. By setting the overlapped portion inside the lift cylinder 1 and slightly rearward as shown in the figure, the mast and the ring top type supporting the cylinder top which is the maximum diameter portion of the lift cylinder shown in FIG. Lift cylinder 1 including a cylinder support member 3 between bodies
It becomes possible to reduce the occupied space in the front-back direction. As a result, the mast unit can be arranged closer to the body side, which is effective in increasing the allowable load.

In this embodiment, the rear half ring member 5 is also used.
Is overlapped so as to cover the end of the front half ring member 4. Generally, at the time of cargo handling work of a forklift, a load in the forward tilt direction mainly acts on the lift cylinder 1 via the inner mast 11. Therefore, the half ring members 4, 5
By setting the overlapping relation of the end portions of the above, it is possible to effectively prevent the front half ring member 4 from opening due to the load. Further, since the mast is assembled in a sideways state, the lift cylinder 1 is not operated until the piston rod of the lift cylinder 1 is connected to the inner mast 1 side.
It is necessary to support the weight of the above by the rear half ring member 5. Therefore, the thickness of the rear half ring member 5 may be set thicker than that of the front half ring member 4 as shown in the drawing so as to prevent deformation due to the weight at this time, thereby enhancing its rigidity. desirable.

Next, a second embodiment of the present invention will be described with reference to FIGS.
It will be described based on. This embodiment is an example applied to a specification vehicle having a mast pipe, and each drawing shows only the right side of the mast. The ring-shaped support member 3 according to this embodiment includes a half ring member 4 having an approximately 2/3 arc shape and a half ring member 5 having an approximately 1/3 arc shape. 5 is a connecting piece 4a, 5a with holes at one end
It has. In this embodiment, the half ring members 4 and 5 hold the upper part of the cylinder body of the lift cylinder 1 so as to sandwich it from the left and right directions. That is, the other ends of the split ring members 4, 5 are overlapped with each other on the rear side of the lift cylinder 1, and specifically, the end of the outer split ring member 5 is the end of the inner split ring member 4. The connecting pieces 4a and 5a are superposed so as to cover the portion, and are fastened by bolts 14 and nuts 15 inserted in the left-right direction to the bracket 13 fixed to the rear surface of the outer mast 1 on the front side.

As a result, a space for hydraulic hose piping is secured outside the lift cylinder 1 and behind the mast. Therefore, as shown in FIG. 3, the hose pulley 16 is attached via the hose bracket 18 to a position above the connecting portion of the piston rod 1a of the lift cylinder 1 and the inner mast 11, and the hydraulic hose 17 is attached so as to straddle the lift cylinder 1. It becomes possible to pipe. In the hydraulic hose 17 thus arranged, at least the portion passing through the outside of the lift cylinder 1 is located behind the outer mast 2 which is the original dead zone area, and the portion passing inside the lift cylinder 1 only obstructs the visual field. Therefore, the front view from the driver's seat is improved as compared with the conventional case where the lift cylinder 1 has to be arranged inside.

[0014]

As described in detail above, according to the present invention,
A ring-shaped cylinder support member for supporting the lift cylinder is composed of two half ring members, and the connecting pieces are fixed to the bracket of the mast in a state where the ends of both half ring members are mutually superposed. With the configuration, the mast unit can be disposed closer to the body side, which helps increase the allowable load. Further, when applied to a specification vehicle having a mast pipe, it is possible to provide a pipe along the rear surface of the mast of the hydraulic hose, so that it is possible to improve the front view and contribute to safety work.

[Brief description of the drawings]

FIG. 1 is a plan view showing a lift cylinder support device according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a lift cylinder support device according to a second embodiment of the present invention.

FIG. 3 is a side view of FIG. 2;

FIG. 4 is a plan view showing a conventional lift cylinder support device.

FIG. 5 is a plan view showing another conventional lift cylinder support device.

FIG. 6 is a front view of FIG. 5;

[Explanation of symbols]

 1 ... Lift cylinder 2 ... Outer mast 3 ... Cylinder support member 4, 5 ... Half ring member 8 ... Bracket 9 ... Bolt 11 ... Inner mast

Claims (1)

(57) [Claims] 1. A lift cylinder support device for fixing the left and right lift cylinder upper parts, which are respectively erected on the lower beams behind the pair of left and right masts, to the outer mast, the pair including a connecting piece at each one end thereof. In the state in which the two half ring members are held so as to sandwich the cylinder body of the lift cylinder from both sides, the other end portions are overlapped with each other and the connecting pieces are outer masts. A lift cylinder support device for a forklift that is configured to be fastened to a rear bracket.