JP4345362B2 - Forklift lift chain swing regulating device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lift chain swing regulating device for a forklift that regulates swing of a lift chain that lifts and lowers a lift bracket equipped with a fork or the like.
[0002]
[Prior art]
The lift chain of a forklift swings back and forth and left and right between the chain wheel that moves up and down together with the inner mast and the anchor part of the lift bracket equipped with the fork, depending on the conditions of the traveling path and the presence or absence of luggage on the fork. . Conventionally, a lift chain swing restricting device for a forklift that restricts swing of the lift chain has been proposed (see Patent Document 1).
[0003]
This is because a "U-shaped" rocking restricting member made of non-ferrous metal such as rubber, resin, and aluminum is positioned behind the lift chain and fixed to the outer mast. A lift chain that is to swing back and forth and from side to side is brought into contact with a swing restricting member to restrict the swing.
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 11-222391
[Problems to be solved by the invention]
By the way, the swinging length and the vertical position of the lift chain change according to the vertical movement position of the chain wheel and the lift bracket, and it is economical to install the swing restricting member so as to cover the entire range. Instead, it is practical to install the rocking restricting member only within the largest rocking range.
[0006]
For this reason, when the swing restricting member is disposed in a partial range in the vertical direction of the outer mast, for example, in the upper half region of the outer mast, the lift chain may be swung depending on the swing state of the lift chain. There is a risk of catching on the back surface on the lower end side.
[0007]
The swing restricting member has a cross-sectional shape with an inclined surface to return the lift chain to the normal position so that this catch does not occur. It can be presumed that the end surface portion of the member does not sufficiently function and the chain is caught, and if the catch occurs, the swing regulating member may be worn, damaged or broken.
[0008]
Accordingly, the present invention has been made in view of the above problems, and an object thereof is to provide a lift chain swing regulating device for a forklift suitable for installation in a partial range.
[0009]
[Means for Solving the Problems]
The present invention includes at least one end of the upper and lower ends of the swing restricting member provided with projecting ends that project further to the side of the vehicle than the projection of the swing restricting member that is located behind the lift chain and projects to the side of the vehicle. In addition, a wraparound restricting portion that covers an end surface of the swing restricting member is provided, and the protrusion end of the swing restricting portion restricts the wraparound of the lift chain to the back surface of the swing restricting member.
[0010]
【The invention's effect】
Therefore, in the present invention, at least one end of the upper and lower ends of the swing restricting member is provided with a projecting end projecting further to the side of the vehicle than the projection of the swing restricting member located behind the lift chain and projecting to the side of the vehicle. A sway restricting portion that covers an end surface of the swing restricting member is provided, and the lift chain is swayed by the swing restricting member so that the projecting end of the sway restricting portion restricts the wraparound of the lift chain to the back surface of the swing restricting member. It is possible to prevent the swing regulating member from being worn, damaged, or broken by wrapping around the back of the shaft and catching the chain on the rear end of the swing regulating member or the mounting bolt.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
[0012]
1 to 4 show an example of a lift chain swing restricting device for a forklift to which the present invention is applied, FIG. 1 is a schematic view showing a region where a lift chain swing restricting device is installed, and FIG. FIG. 3 is a perspective view showing a specific configuration of the restricting device in parts, FIG. 3 is a sectional view of the lift chain swing restricting device attached, and FIG. 4 is a plan view and a side view of the wraparound restricting member.
[0013]
First, the configuration of a forklift mast device 1 will be described with reference to FIG. The mast device shown in FIG. 1 includes a pair of inner masts 4 that can be moved up and down by a lift cylinder 3 in a pair of outer masts 2 that are arranged on both sides on the outer side in the vehicle width direction and connected to each other by a cross member 2A. 4A is stored in a state of being connected to each other. A lift bracket 5 is accommodated in the pair of inner masts 4 so as to be movable up and down. A chain wheel 6 is rotatably mounted on both ends of the cross member 4A of the inner mast 4, and a lift chain 7 having one end fixed to the anchor bracket 2B of the outer mast 2 via a chain anchor 7A is wound around the chain wheel 6. The other end of the lift chain 7 is connected to brackets 5 </ b> A that are located in front of both sides of the outer mast 2 and extend to both sides of the lift bracket 5. For this reason, when the inner mast 4 is lifted and lowered including the chain wheel 6 by the lift cylinder 3, the lift bracket 5 connected to the other end of the lift chain 7 is lifted and lowered at a double speed with respect to the inner mast 4. The fork 9 mounted on the carriage 8 fixed to the lift bracket 5 moves up and down together with the lift bracket 5. The outer mast 2 is supported on the axle so as to be able to tilt forward and backward via a mast support 2 </ b> C, and can be tilted in the front-rear direction by an expansion / contraction operation of a tilt cylinder 11 disposed between the vehicle body 10 and the outer mast 2.
[0014]
The mast device 1 described above is not a feature of the present invention, but is a general two-stage mast configuration to which the present invention is applied. The present invention is not limited to the mast device 1 having this configuration. The present invention can also be applied to other types of mast devices such as a two-stage full free mast, a three-stage mast, and a three-stage full free mast.
[0015]
The lift chain rocking | fluctuation control apparatus 20 characterized by this embodiment is equipped with the hatched range in the figure of the both sides | surfaces of the outer mast 2, for example. The lower end may be extended below the range shown or shortened upward, and the upper end may be extended above the range shown or shortened downward. It is only an example.
[0016]
As shown in FIGS. 2 and 3, the lift chain swing restricting device 20 includes a swing restricting member 21 formed of an extruded profile and a wraparound restricting member 22 disposed at the end of the swing restricting member 21. It is composed. The swing restricting member 21 and the turnaround restricting member 22 are fastened together with a bolt 24 to a boss 2D having a female screw fixed to the outer mast 2 via a collar 24. In the central portion of the swing restricting member 21, only the swing restricting member 21 is fastened and fixed to the boss 2 </ b> D of the outer mast 2 by the bolt 23 via the bolt seat surface plate 25 and the collar 24.
[0017]
As shown in FIG. 3, the swing restricting member 21 forms a mounting portion 21A that forms a mast mounting surface including a groove 21D that accommodates the boss 2D, and a concave portion 21B that slightly surrounds the lift chain 7 from the rear. The mounting portion 21A has a cross-sectional shape including a protrusion 21C extending from the front of the vehicle and a protrusion 21E raised from the mounting portion 21A, and is formed in a uniform cross section. The swing restricting member 21 may be made of metal or non-metal such as resin, rubber, wood, etc., and is preferably formed by an extruded shape as a molding method. The mounting portion 21A is provided with a through hole 21F into which the bolt 23 and the collar 24 are inserted so as to open at the bottom of the groove 21D. When the collar 24 is inserted into the through-hole 21F and the bolt 23 is passed through and screwed into the boss 2D and fixed to the boss 2D, the recess 21B formed by the protrusions 21C and 21E accommodates the lift chain 7 halfway. Then, the range in which the lift chain 7 swings is restricted so as not to swing significantly. In order to mitigate the impact when the lift chain 7 comes into contact with the swing restricting member 21, for example, when the swing restricting member 21 is made of non-ferrous metal such as rubber, resin, aluminum, etc. No shock absorbing material is required, and the rocking restriction member 21 itself has an impact absorbing function.
[0018]
As shown also in FIG. 4, the wraparound restricting member 22 includes a mounting portion 22A for the outer mast 2 and a wrapping restricting plate 22B provided on an end surface of the mounting portion 22A. The shape shown in FIGS. 3 and 4 is arranged on the lower end side of the swing restricting member 21, and the wrap restricting member 22 disposed on the upper end of the swing restricting member 21 has the wrap restricting plate 22 </ b> B as an attachment portion. It becomes the shape of the wrongness arrange | positioned above 22A. Here, only the wrap-around restricting member 22 disposed at the lower end of the illustrated swing restricting member 21 will be described, and the description of the wrap-around restricting member 22 disposed at the upper end will be omitted.
[0019]
A tip of the coupling loop regulating plate 22B is formed in a protruding end 22C with (dimension X in the figure) of the smooth curved edge further protrudes from the upright projections 21E of the swing regulating member 21, the vehicle continues from the projecting end 22C The front edge is formed so as to recede slightly from the recess 21B of the swing restricting member 21 facing the lift chain 7 to the rear of the vehicle. An edge on the vehicle rear side that continues from the protruding end 22C of the wrap-around restricting plate 22B is formed on a curved surface 22D that smoothly curves and reaches the outer mast 2 side. The attachment portion 22A to the outer mast 2 has a substantially L-shaped cross-sectional shape that covers the attachment portion 21A of the rocking restriction member 21, and includes a fitting hole 22E through which a bolt 23 that fixes the rocking restriction member 21 passes. .
[0020]
The wraparound restricting member 22 has an attachment portion 22A overlaid on the attachment portion 21A of the swing restricting member 21 in which the collar 24 is inserted into the through hole 21F, and a bolt 23 is inserted into the attachment hole 22E and the collar 24 and screwed into the boss 2D. By this, it is fixed to the outer mast 2 in a fastened state. In the fixed state, the sway restricting plate 22B of the sway restricting member 22 contacts the end surface of the swing restricting member 21, the projecting end 22C projects from the protrusion 21E of the swing restricting member 21 toward the vehicle side, and the rear portion of the protrusion 21E in the vehicle Will be covered from above and below. A wraparound restricting member 22 shown in FIG. 5 is configured by integrally forming a collar 24 in a row with the through hole 22E of the wraparound restricting member 22 shown in FIG. 4, and the other structure is the same as the wraparound restricting member 22 shown in FIG. It is formed similarly.
[0021]
In the lift chain swing restricting device 20 configured as described above, as shown in FIG. 3, a part of the swinging lift chain 7 may get over the protrusion 21E of the swing restricting member 21 as indicated by an arrow A. In addition, the slewing restricting plate 22 </ b> B of the sway restricting member 22 restricts the lift chain 7 from turning around the back surface of the protrusion 21 </ b> E of the swing restricting member 21. The length of the chain 7 that goes over the protrusion 21E is a partial range that is swung to the maximum, and if it does not get caught by any member, the lifted chain 7 (shown by a broken line) that gets over the tension acts on the chain 7 itself. Thus, the initial position can be restored again as indicated by an arrow. Even if the swing chain 7 swings greatly so that the lift chain 7 reaches the upper and lower ends of the swing restricting member 21 over the protrusion 21E, the upper and lower end wrap restricting plates 22B prevent the protrusion 21E from reaching the back surface. However, it does not reach the dotted line state in the figure, and can be returned to the normal position again as indicated by arrow B by the vibration of the vehicle or the like.
[0022]
In the embodiment described above, the rocking restricting member 21 and the turnaround restricting member 22 are fixed by the common bolt 23. However, although not shown, the swing restricting member and the turnaround restricting member are separately provided in the outer mast. It may be fixed to. Moreover, although the thing from which both became separate is demonstrated, although not shown in figure, both may be formed integrally.
[0023]
Further, in the above-described embodiment, the wrap-around restricting plate 22B of the wrap-around restricting member 22 that extends to the back surface of the swing restricting member 21 and extends to the side of the swing restricting member 21 has been described. However, as a function of the sway restricting plate 22B, if the sway restricting portion extending to at least the back surface portion of the swing restricting member 22 is provided, it is possible to prevent the lift chain 7 from turning around to the back surface of the swing restricting member 21. In addition, if it extends also to the side of the swing restricting member 21, it is possible to suppress the wraparound of the lift chain 7 to the side surface portion of the swing restricting member 21.
[0024]
In the present embodiment, the following effects can be achieved.
[0025]
(A) At least one end of the upper and lower ends of the swing restricting member 21 is provided with a turn restricting plate 21B as a turn restricting portion extending from the swing restricting member 21 to at least the back surface of the swing restricting member 21, and the turn restricting plate 22B. Therefore, the lift chain 7 wraps around the back surface of the swing restricting member 21 to the rear end of the swing restricting member 21, the mounting bolt 23, and the like. The chain swing restricting member 21 of the chain 7 can be prevented from being worn, damaged or broken.
[0026]
(A) Since the wrap-around restricting plate 22B is extended also to the side of the swing restricting member 21, it is possible to suppress the wraparound of the lift chain 7 to the side of the swing restricting member 21.
[0027]
(C) Since the sneaking restricting plate 22B is provided at both the upper and lower ends of the swing restricting member 21, damage caused by the chain 7 on the back of the swing restricting member 21 can be greatly reduced.
[0028]
(D) Since the sneaking restricting plate 22B is configured as a separate member from the sway restricting member 21 as the sneaking restricting member 22, the swing restricting member 21 can be formed at a low cost with an extruded profile having a uniform cross section.
[0029]
(E) In the embodiment shown in FIG. 4, the lift chain 7 is arranged vertically in the side and front of the outer mast 2, and the swing restricting member 21 and the wraparound restricting member 22 are connected to the outer mast 2 by the same bolt 23. Since it is fixed together, the plain washer used for fixing the rocking | fluctuation control member 21 can be abolished, and it can comprise at low cost.
[0030]
(F) In the embodiment shown in FIG. 5, the wraparound restricting member 22 includes a collar 24 that is connected to the attachment hole 22 </ b> E into which the bolt 23 is inserted and fits into the attachment hole 21 </ b> F of the swing restricting member 21. When the rocking restricting member 21 is formed of a soft material such as resin or rubber, it is not necessary to prepare and assemble a deformation preventing collar for tightening the bolt used for the fixing portion, thereby improving the assembling work efficiency.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a region where a lift chain swing regulating device is installed.
FIG. 2 is an exploded perspective view showing a specific configuration of a lift chain swing restricting device according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view of the lift chain swing restricting device attached.
FIG. 4 is a plan view (A) and a side view (B) of a wraparound restricting member.
FIGS. 5A and 5B are a plan view and a side view, respectively, of another embodiment of the wrap-around restricting member. FIGS.
[Explanation of symbols]
1 Mast Device 2 Outer Mast 3 Lift Cylinder 4 Inner Mast 5 Lift Bracket 6 Chain Wheel 7 Lift Chain 9 Fork 10 Car Body 11 Tilt Cylinder 20 Lift Chain Swing Restricting Device 21 Swing Restricting Member 22 Turning Restricting Member 23 Bolt 24 Color

Claims (5)

In a lift chain swing restricting device for a forklift, in which a swing restricting member is disposed behind the lift chain disposed in the vertical direction to restrict swing of the lift chain.
At least one end of the upper and lower ends of the rocking restriction member is provided with a projecting end that protrudes further to the vehicle side than the protrusion of the rocking restriction member that is located behind the lift chain and protrudes to the vehicle side, A wraparound restricting portion that covers the end surface of the swing restricting member is provided,
A lift chain swing restricting device for a forklift that restricts the lift chain from turning back to the back of the swing restricting member by the protruding end of the turn restricting portion. The lift chain swing restricting device for a forklift according to claim 1, wherein the wraparound restricting portions are provided at both upper and lower ends of the swing restricting member . 3. The lift chain swing regulating device for a forklift according to claim 1 , wherein the slew restricting portion is configured as a swing restricting member separately from the swing restricting member . 4. The lift chain is arranged in the vertical direction in the side and front of the outer mast to claim 3 is the regulating member wraparound the swing regulating member, characterized in that it is fixed by co-fastening to the outer mast by the same bolts The lift chain swing regulating device for a forklift as described. 5. The lift chain swing regulation of a forklift according to claim 4 , wherein the wraparound restricting member includes a collar that is connected to the mounting hole of the swing restraining member so as to be connected to the mounting hole into which the bolt is inserted. apparatus.

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