KR20130132031A - A mast structure in forklift for a improving rangeof view - Google Patents

A mast structure in forklift for a improving rangeof view Download PDF

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Publication number
KR20130132031A
KR20130132031A KR1020120056091A KR20120056091A KR20130132031A KR 20130132031 A KR20130132031 A KR 20130132031A KR 1020120056091 A KR1020120056091 A KR 1020120056091A KR 20120056091 A KR20120056091 A KR 20120056091A KR 20130132031 A KR20130132031 A KR 20130132031A
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KR
South Korea
Prior art keywords
mast
pair
forklift
carriage
hydraulic cylinders
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Application number
KR1020120056091A
Other languages
Korean (ko)
Inventor
혁 최
Original Assignee
현대중공업 주식회사
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Priority to KR1020120056091A priority Critical patent/KR20130132031A/en
Publication of KR20130132031A publication Critical patent/KR20130132031A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/08—Masts; Guides; Chains
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/205—Arrangements for transmitting pneumatic, hydraulic or electric power to movable parts or devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
    • B66F17/003—Safety devices, e.g. for limiting or indicating lifting force for fork-lift trucks

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

The present invention relates to a mast structure of a forklift, and more particularly, to a forklift mast structure for securing a forward view of a forklift driver.
The present invention includes a lower mast including a pair of guide beams are formed on the inner surface of the rail; An intermediate mast coupled to the inside of the lower mast to move up and down; A pair of sprockets coupled to the intermediate mast; An upper mast coupled to an inner side of the intermediate mast to move up and down; A carriage which is lifted and lowered on the upper mast; One end is fixed to the lower mast, the other end is fixed to the upper mast, the chain via the sprocket; A pair of carriage hydraulic cylinders fixed to a lower end of the upper mast to move the carriage up and down; A pair of main hydraulic cylinders distributed and installed at both sides of the viewing space of the lower mast, and raising and lowering the intermediate mast; And an attachment line for supplying hydraulic oil to the pair of main hydraulic cylinders and the carriage hydraulic cylinders.

Description

A MAST STRUCTURE IN FORKLIFT FOR A IMPROVING RANGEOF VIEW}

The present invention relates to a mast structure of a forklift, and more particularly, to a forklift mast structure for securing a forward view of a forklift driver.

In general, the forklift is a equipment mainly used to lift or move cargo while lifting and lowering the fork, and a mast structure in which the length is increased and decreased in the vertical direction by a hydraulic cylinder is installed at the front, and a fork or a work device is attached to the mast structure. Use a carriage that can be used.

In this mast structure, a plurality of masts are supported by a ruler so that they can be clouded in the vertical direction. There are two-stage mast structures in which two masts are combined and a three-stage mast structure in which three masts are combined. .

In the case of the three-stage mast structure, when the main hydraulic cylinder is lifted, the middle mast rises, and the sprocket provided on the middle mast pulls the chain and the top mast rises.

Attached Figure 1 is a view showing a conventional forklift mast structure, generally consisting of a pair of guide beams, the three-stage mast (2) and the sprocket (4) consisting of the main, middle, top mast, and the chain ( 5), an hydraulic cylinder 6 and an attachment line 7 for supplying hydraulic oil. And, it is provided with a carriage (8) provided to be moved up and down along the top mast to load the cargo.

However, in the mast structure as described above, both the chain 5 and the sprocket 4 are provided inside the mast, and the main hydraulic cylinder 6 is also provided at the inner center of the mast.

Moreover, the attachment line 7 which supplies hydraulic oil to the hydraulic cylinder 6 provided in the mast 2 is also arrange | positioned inside of the mast 2, and it causes the forklift driver's view.

This leads to a decrease in workability of the forklift, and furthermore, there is a problem that can lead to a safety accident during forklift operation.

Prior art of the present invention is the Republic of Korea Utility Model Registration No. 20-0405942, the prior art describes a technique related to the mast assembly of the forklift to ensure visibility.

An object of the present invention is to provide a forklift mast structure that can extend the front view of the forklift driver by improving the forklift mast structure and the cylinder installation structure.

Another object of the present invention is to improve the attachment line arrangement structure provided in the forklift mast to provide a front view of the driver, thereby providing a forklift mast structure that can not only improve workability but also improve the safety of the forklift truck. have.

The present invention includes a lower mast including a pair of guide beams are formed on the inner surface of the rail; An intermediate mast coupled to the inside of the lower mast to move up and down; A pair of sprockets coupled to the intermediate mast; An upper mast coupled to an inner side of the intermediate mast to move up and down; A carriage which is lifted and lowered on the upper mast; One end is fixed to the lower mast, the other end is fixed to the upper mast, the chain via the sprocket; A pair of carriage hydraulic cylinders fixed to a lower end of the upper mast to move the carriage up and down; A pair of main hydraulic cylinders distributed and installed at both sides of the viewing space of the lower mast, and raising and lowering the intermediate mast; And an attachment line for supplying hydraulic oil to the pair of main hydraulic cylinders and the carriage hydraulic cylinders.

In addition, the sprocket provided in the intermediate mast is provided on both sides of the intermediate mast.

The attachment lines may be arranged in a line such that the attachment line widths overlap each other on the same vertical plane in the driver's field of view.

And, the middle mast is coupled vertically to the inner surface, a pair of pulleys passing through the attachment line; characterized in that it comprises a.

In addition, the pulley, the diameter of the pulley provided on the lower side is formed smaller than the diameter of the pulley provided on the upper side.

In addition, when the top mast and the middle mast is lowered, the width of the viewing space of the driver to be secured is characterized in that the 60cm ~ 100cm.

And, when the top mast and the middle mast is raised, the width of the driver's field of view secured is characterized in that between 80cm ~ 250cm.

The forklift mast structure capable of securing the visibility according to the present invention arranges the chain and the sprocket on both sides of the outside of the mast, and combines the main hydraulic cylinder on both sides of the bottom mast to obtain an effect of securing the front view of the operator.

In addition, in the arrangement of the attachment lines, the attachment line widths are arranged in a line so as to overlap each other on the same vertical plane in the driver's field of view, thereby securing a viewing space, thereby bringing not only an improvement in workability but also safety.

1 is a configuration diagram showing a mast structure of a conventional forklift.
Figure 2 is a perspective view showing a forklift mast structure capable of ensuring a field of view according to an embodiment of the present invention.
3 is a cross-sectional view showing an attachment line arrangement structure according to an embodiment of the present invention;
Figure 4 is a state diagram showing a state in which the forklift mast structure that can be secured according to an embodiment of the present invention is lowered.
5 is a side view illustrating a state in which a forklift mast structure capable of securing a visibility according to an embodiment of the present invention is raised.

Hereinafter, the present invention will be described in detail with reference to preferred embodiments of the accompanying drawings.

The drawings and the following description below are for the preferred embodiments of the various methods for effectively explaining the features of the present invention, the scope of the present invention is limited by the embodiments of the drawings and description presented in the specification of the present invention It doesn't happen.

In addition, in describing the present invention, when it is determined that the detailed description of the related known function or configuration may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, in order to efficiently describe the technical components constituting the present invention is provided in each functional configuration, or the functional configuration of the structure typically provided in the technical field to which the present invention belongs, omit possible, additionally for the present invention It mainly describes the functional configuration to be provided.

1 is a configuration diagram showing a mast structure of a conventional forklift, and the description thereof will be omitted in the description of the above-described technical item that is the background of the invention.

A preferred embodiment of a forklift mast structure 10 capable of securing a visibility according to an embodiment of the present invention will be described with reference to FIGS. 2 and 3.

The present invention is coupled to the inner side of the lower mast mast 100 and the lower mast 100 and a pair of guide beams are formed on the inner side of the intermediate mast 200 and the intermediate mast 200 A pair of sprockets 260 and a carriage 400 which are coupled to the inner side of the middle mast and are lowered along the upper mast 300 and the lower end of the carriage 400 are provided. 100 is fixed and the other end is fixed to the upper mast 300, the chain 600 via the sprocket 260 and are distributed and installed on both sides of the viewing space 900 of the lower mast 100, A pair of main hydraulic cylinders 510 and 520 for raising and lowering the intermediate mast 200; and a pair of carriage hydraulic cylinders 700 fixed to a lower end of the upper mast 300 to raise and lower the carriage 400; ) And the pair of main hydraulic cylinders (510, 520) And an attachment line 800 for supplying hydraulic oil to the carriage hydraulic cylinder 700.

Here, the viewing space 900 is a space range in which the forklift driver can see the front, the space generated between the beam and the beam of each of the lower mast 100, the intermediate between the mast 200, the upper mast 300 Say

The attachment line 800 includes an inlet hose 820 and an outlet hose 840.

The lower mast 100 of the present invention is implemented by configuring a pair of guide beams (111, 112) in which the guide portion 120 is formed as shown in FIG.

The guide part 120 is disposed to face each other inside the guide beams 111 and 112.

Guide portion 120 is preferably implemented in the form of one or more protruding rails.

In addition, the lower mast 100 is coupled to the upper member 150 and the lower member 130 and the central portion are fixed to the upper end of the guide beams 111 and 112 to fix and support the guide beams 111 and 112. It is carried out in a configuration including an auxiliary member 140 that is.

The main hydraulic cylinders 510 and 520 of the present invention are distributed and installed on both sides of the viewing space 900 and are fixed to the guide beams 111 and 112 of the lower mast 100.

The pair of main hydraulic cylinders 510 and 520 are fixed to the lower member 130 of the lower mast 100.

Most preferably, it is arranged to be in contact with the rear end surface of the guide beams (111, 112) is configured to ensure the viewing space 900 of the forklift driver to the maximum.

The coupling method of the guide beams 111 and 112 and the main hydraulic cylinders 510 and 520 may be bonded by electric welding.

However, in some cases, it may be fastened using a plurality of 'U' bolts to facilitate the replacement parts.

Upper ends of the main hydraulic cylinders 510 and 520 are fixed to an upper end of the intermediate mast 200 to raise and lower the intermediate mars 200.

The lower member 130 is preferably performed by forming a base portion to which the main hydraulic cylinders 510 and 520 of the present invention can be fixedly coupled.

In addition, it is preferable to configure and implement a hinge portion that can be engaged with the forklift at both ends of the lower member (130).

The auxiliary member 140 is formed to be fixed across the guide beams 111 and 112.

In addition, it is preferable to install so as to be spaced apart from each of the guide beams (111, 112).

To this end, as shown in the figure, the shape of the auxiliary member 140 is configured in a 'c' shape so that each end of the open portion is configured to be connected to the guide beams 111 and 112, respectively.

The upper member 150 may be installed to be spaced apart from the guide beams 111 and 112 at the same distance as the auxiliary member 140.

That is, when the pair of main hydraulic cylinders (510, 520) is assembled to the lower mast 100, the body of each of the main hydraulic cylinders (510, 520) the upper member 150 and the auxiliary member 140 Form to wrap.

Therefore, the main hydraulic cylinders 510 and 520 can be protected from collision with the forklift body or the outside which may occur when the forklift mast is used, and the installation and driving space can be secured.

Upper ends of the guide beams 111 and 112 are provided with a chain fixing member 170 protruding outward.

In addition, as shown in FIG. 2, one or more reinforcing pieces 160 may be further configured to reinforce the support of each of the guide beams 111 and 112.

The intermediate mast 200 of the present invention is provided on the upper end of the pair of intermediate guide beams 211 and 212 and the intermediate guide beams 211 and 212, and the upper coupling member 240 for fixing and supporting the respective intermediate guide beams 211 and 212. Configure and carry out.

The upper coupling member 240 is preferably made of a plate-shaped metal material.

In addition, the upper entrance 245 is formed to enable the vertical reciprocating movement of the upper mast 300.

And, it is carried out by forming the brackets 250 on both outer ends of the upper coupling member 240.

The bracket 250 is connected to each sprocket 260 is formed to be idle.

Inward rails 230 are continuously formed in the middle guide beams 211 and 212, and outward rails 220 are formed outward.

The outward rail 220 is formed to correspond to the guide portion 120 provided in the lower mast 100, it is configured to move up and down along the guide portion 120.

In some embodiments, the rotating ruler may be additionally configured to rotate in engagement with the outward rail 220 at an upper end of the lower mast 100 for a smooth descending of the intermediate mast 200.

Intermediate mast 200 of the present invention should be coupled to be raised and lowered in contact with the guide portion 120 provided on the inside of the lower mast 100.

Therefore, the intermediate mast 200 is configured to be smaller than the width of the lower mast 100 to be coupled to the inside of the lower mast 100.

In addition, the upper mast 300 is provided with the inward rail 230, which is formed to move up and down to face each other in the middle of the mast 200.

In the present invention, the attachment lines 800 are arranged in a line such that the attachment line widths overlap each other on the same vertical plane in the driver's field of view.

Referring to FIG. 3, the arrangement of the attachment line 800 including the inlet hose 820 and the outlet hose 840 is arranged in a line so as to coincide on one straight line.

In this embodiment, the inlet hose 820 of the attachment line 800 is disposed outside the array, and the outlet hose 840 is disposed inside the array.

Therefore, since the attachment line 800 occupies only the width corresponding to the width of the inlet hose 820, the width of the viewing space 900 can be expanded.

In order to arrange the attachment line 800, the present invention includes a pair of pulleys 270 and 280 that span the attachment line 800 on an upper end of the intermediate mast 200.

The pulleys 270 and 280 are fixed to face each other inward of the intermediate guide beam 211.212.

At this time, as shown in the enlarged portion of the main portion attached to Figure 2 is a separate reinforcing rib 290 to reinforce between the upper coupling member 240 and the intermediate guide beams (211,212) provided on the upper end of the intermediate mast (200) It can be implemented by configuring.

The pair of pulleys 270 and 280 are fixed to the inner side of the reinforcing rib 290.

The fixing of the pulleys 270 and 280 is vertically coupled to the intermediate guide beams 211 and 212.

After the arrangement as in the embodiment can be implemented by consisting of the upper pulley 270 and the lower pulley 280.

The pair of pulleys 270 and 280 form a hose seating groove 275 having a size corresponding to the cross-sectional diameter of the attachment line 800 on the outer circumferential surface, respectively.

The diameter of the hose seating groove 275 is preferably formed to be equal to or larger than the cross-sectional diameter of the inlet hose 820 when the inlet hose 820 spans the pulley 270 installed on the upper portion.

In some embodiments, at least one attachment line 800 may be stretched and driven, such as a pulley 280 installed at a lower portion of the enlarged main part of FIG. 2.

In this case, the hose seating groove 275 is one groove having a width corresponding to the sum of the diameters of the plurality of attachment lines 800 or the plurality of grooves corresponding to the diameters of the respective attachment lines 800. It can be configured and carried out.

Preferably, the diameters of the pulleys 270 and 280 are configured to be smaller than the diameter of the pulley fixed to the upper side.

The diameter (D) of the seating groove (275) formed in the pulley (270) installed in the upper portion as shown in the enlarged main portion of Figure 2, the seating groove diameter (d1) of the pulley (280) installed in the lower The cross-sectional diameter d2 x 2 of the attachment line 800 spanning the pulley 280 provided on the lower portion is larger than the combined value d.

Therefore, when viewed in cross section, a predetermined spaced space (W) is formed between each of the attachment line 800 spanning the upper pulley 270 and the lower pulley 280, eliminating the interference of the attachment line 800 It is possible to prevent rupture due to friction.

The upper mast 300 of the present invention includes a pair of upper guide beams 311 and 312 spaced apart at a predetermined distance.

In addition, a lower coupling member 340 supporting the upper guide beams 311 and 312 by being connected to each other at a lower end and a crossbar 360 supporting at an upper end thereof.

The upper mast 300 is coupled to the inner side of the intermediate mast 200 is raised and lowered.

Accordingly, the upper guide beams 311 and 312 form outer rails 320 that are formed to face both sides outward.

The outer rail 320 is configured to correspond to the inward rail 230 that is configured to face the inside of the intermediate mast (200).

The lower coupling member 340 may be implemented by configuring a base portion 345 that can secure the lower end of the pair of carriage hydraulic cylinder (700).

The carriage 400 of the present invention includes a pair of forks 420 capable of loading cargo and a carriage frame 440 supporting them.

In addition, the front and inner surfaces of the top guide beams 311 and 312 of the upper mast 300 are in contact with each other, and constitute a pair of carriage brackets 460 provided to be elevated.

In this embodiment, the carriage bracket 460 is formed on both sides to the outer side at the top to rotate the carriage 400 along the inner surface of the top mast 300 when the ascent of the carriage 400 to reduce the contact friction force 465 Can be implemented.

At this time, the guide rails formed to face each other to guide the carriage roller 465 in the inner side of the upper mast 300 may be further configured.

The carriage hydraulic cylinder 700 of the present invention is provided separately into the upper guide beams 311 and 312 of the upper mast 300, respectively.

In this case, the upper and lower guide beams 311 and 312 are closely coupled to each other so as to secure the viewing space 900 of the forklift driver as much as possible.

The lower end of the carriage hydraulic cylinder 700 is fixed to the base portion 345 formed on the lower coupling member 340 of the upper mast 300.

The upper end of the carriage hydraulic cylinder 700 is fixed to the rear end of the carriage bracket 460 to raise and lower the carriage 400 within the upper mast 300 range.

One end of the chain 600 according to the present invention is fixed to the chain fixing member 170 provided on the upper outer side of the lower mast 100.

The other end of the chain 600 is fixed to both ends of the lower coupling member 340 of the upper mast 300, and spans the sprocket 260.

As a fixing method, a male screw having a screw thread is connected to an end of the chain 600, and a screw fastening method of forming a through hole in the chain fixing member 170 and fixing the female screw using a female screw.

In some cases, a method of welding the end of the chain 600 to a portion to be fixed may also be applied.

Accordingly, when the main mast cylinders 510 and 520 are operated to lift the intermediate mast 300, the upper mast 300 may also rise.

Referring to the preferred assembly process of the forklift mast structure 10 capable of ensuring the view made of the above configuration is as follows.

The pair of guide beams 111 and 112 are separated at a predetermined distance, and the guide parts 120 formed on the guide beams 111 and 112 are disposed to face each other inward.

Then, the lower member 130 and the upper member 150 and the auxiliary member 140 are combined.

The bottom mast 100 is completed by coupling the chain fixing member 170 to both outer sides of the upper ends of the guide beams 111 and 112.

In this case, the supporting force of the lower mast 100 may be reinforced by additionally connecting the reinforcing pieces 160 connecting and reinforcing the respective guide beams 111 and 112 at the middle portions of the guide beams 111 and 112.

The upper ends of the intermediate guide beams 211 and 212 and the guide beam spaced apart by a predetermined distance are connected to each other to support the upper coupling member 240 having the upper entrance 245.

The separation distance of the intermediate guide beams 211 and 212 is formed to be narrower than the width of the lower mast 100 so as to be fitted inside the lower mast 100.

Each of the intermediate guide beams 211 and 212 may be formed at both outer sides thereof, and may include an outward rail 220 formed to correspond to the guide part 120 and an inward rail 230 formed to face each other inward.

Then, the bracket 250 protruding downward from both ends of the upper coupling member 240 is coupled.

In addition, the reinforcing ribs 290 are coupled to both sides of the upper coupling member 240 and the edges of the intermediate guide beams 211 and 212 to support the intermediate mast 200.

It is provided with a pair of top guide beams 311 and 312 which are spaced apart at a predetermined distance and are narrower than the width of the intermediate mast 200 so as to fit inside the intermediate mast 200.

And. The lower coupling member 340 is connected to each other at the lower ends of the upper guide beams 311 and 312 to support each other.

At this time, the lower coupling member 340 forms a base portion 345.

The upper guide beams 311 and 312 form outer rails 320 corresponding to the inward rails 230 of the intermediate mast 200 on outer surfaces thereof.

In addition, guide rails formed to face each other may be further formed on inner surfaces of the upper guide beams 311 and 312.

Then, the upper mast 300 is completed by connecting crossbars 360 supporting the upper ends of the upper guide beams 311 and 312.

A carriage frame 440 having a lattice structure is manufactured.

Then, assembling a pair of forks 420 formed to load the cargo in front of the carriage frame 440.

The carriage bracket 460 is fastened to the rear of the carriage frame 440 along the front and inner surfaces of the upper guide beam 311.312.

In addition, the carriage bracket 460 is coupled to the outside of the carriage ruler 465 to complete the carriage 400.

The intermediate mast 200 is fitted into the guide portion 120 of the completed lower mast 100 so that the outward rail 220 of the intermediate mast 200 slides.

Then, the upper mast 300 is fitted and assembled to slide along the inward rail 230 inward of the middle mast 200.

The completed carriage 400 is moved to closely position the carriage bracket 460 to be slid inwardly of the upper mast 300.

A pair of main hydraulic cylinders 510 and 520 provided therein is inserted into the auxiliary member 140 and the upper member 150.

The lower ends of the pair of main hydraulic cylinders 510 and 520 are fixed to the lower member 130 of the lower mast 100.

In this case, the main hydraulic cylinders 510 and 520 are separated and positioned behind the respective guide beams 111 and 112.

Fix the body of the pair of main hydraulic cylinder (510, 520) to the respective guide beam (111, 112) by 'U' bolt or welding.

The ends of the reciprocating link portions of the pair of main hydraulic cylinders 510 and 520, that is, the upper ends thereof, are fixed to the upper ends of the intermediate mast 200.

A pair of carriage hydraulic cylinders 700 are provided to be in close contact with the upper guide beams 311 and 312 from the inside of the outer frame 300 and then fixed to the base portion 345 of the outer frame 300. .

The ends of the carriage hydraulic cylinder 700 reciprocating link are fixed to the carriage bracket 460, respectively, and are positioned inside the upper entrance 245 of the upper mast 300.

A pair of pulleys (270, 280) are installed to face each other in the reinforcing rib 290 provided in the intermediate mast (200).

A pair of sprockets 260 are assembled to the bracket 250 provided on the upper outer surface of the middle mast 200.

Then, the pair of chain 600 is divided and fastened.

One end of the chain 600 is fixed to the chain fixing member 170 provided on the upper outer side of the lower mast 100 using a screw.

The sprocket 260 is fixed to the lower coupling member 340 of the upper mast 300.

The attachment line 800 for supplying hydraulic oil to the pair of main hydraulic cylinders 510 and 520 is connected.

Then, the assembly of the forklift mast structure 10 capable of securing the visibility of the present invention by connecting the attachment line 800 including the inlet hose 820 and the outlet hose 840 to supply the hydraulic fluid to the carriage hydraulic cylinder 700. To complete.

At this time, the attachment line 800 for supplying the hydraulic oil to the carriage hydraulic cylinder 700 spans a pair of pulleys 270 and 280 provided in the vertical direction inside the intermediate mast 200.

Hereinafter will be described with reference to Figures 4 and 5 attached to the operation of the present invention forklift mast structure 10 is possible.

4 is a state diagram showing a state in which a forklift mast structure 10 capable of securing a view according to an embodiment of the present invention is lowered, and FIG. 5 is a view showing a forklift mast structure 10 capable of securing a view according to an embodiment of the present invention. It is a side view which shows the state which rose.

Figure 4 is a view from the rear of the assembly process of the forklift mast structure 10, the inventors can secure the view is completed. That is, the shape is viewed from the perspective of the forklift driver.

As shown in the accompanying drawings, a pair of main hydraulic cylinders 510 and 520 are separated into left and right sides and are coupled to the lower mast 100, and are configured to be closely coupled to the guide beams 111 and 112 from the rear.

In addition, the carriage hydraulic cylinder 700 is configured to be in close contact with the respective upper guide beams (311, 312) in the inner side of the upper mast (300).

Therefore, when the forklift mast structure 10 of the present inventors can secure the view, it can be finally secured by the width W1 between the carriage hydraulic cylinders 700.

In this case, the width W1 of the viewing space 900 is formed to be between 60 cm and 100 cm.

5 is a side view showing a state in which the forklift mast structure 10 of which the inventors can secure the view is raised.

In the operation sequence, first, the hydraulic oil is supplied to the pair of main hydraulic cylinders 510 and 520 through the attachment line 800.

The reciprocating links of the pair of main hydraulic cylinders 510 and 520 are raised to lift the intermediate mast 200.

At this time, the sprocket 260 provided on the outside of the middle mast 200 is raised, and lifts the upper mast 300 through the chain 600 spanning.

As the sprocket 260 rises, the distance of the chain 600 between the sprocket 260 and the lower mast 100 becomes longer, and the distance of the chain 600 between the sprocket 260 and the upper mast 300 becomes shorter. .

Therefore, only the operation of the pair of main hydraulic cylinders 510 and 520 can raise the middle mast 200 and the upper mast 300 at the same time.

And supplying the hydraulic fluid to the carriage hydraulic cylinder 700 to raise and lower the carriage 400 to adjust the loading height of the cargo.

At this time, the attachment line 800 for supplying the hydraulic fluid to the carriage hydraulic cylinder 700 may be maintained over the pair of pulleys 270 and 280 without being disturbed or overlapped.

In addition, by arranging the arrangement of the attachment line 800 over the pair of pulleys 270 and 280 so as to overlap each other on the same vertical line, the area covering the viewing space 900 of the forklift driver can be minimized.

In addition, by positioning the sprocket 260 outside the middle mast 200, it is possible to eliminate the viewing angle obstacle caused by the chain 600.

As a result, when the intermediate mast 200 and the upper mast 300 are raised, it is possible to secure a wider view width W2 to the forklift driver.

At this time, the width W2 of the viewing space 900 is formed to be between 80cm ~ 250cm.

The above embodiments are merely illustrative of preferred embodiments of the present invention, and the scope of application of the present invention is not limited to the above, and may be appropriately changed within the scope of the same idea.

Accordingly, the shape and structure of each component shown in the embodiments of the present invention can be modified and carried out, and such modifications are naturally within the scope of the appended claims.

10; Forklift mast structure with visibility
100; Bottom mast
111, 112; Guide beam 120; Guide portion
130; Bottom member 140; Auxiliary
150; Upper member 160; Reinforcement piece
170; Chain fixing member
200; Middle mast
211, 212; Intermediate guide beam 220; Outward rail
230; Inward rail 240; Upper coupling member
245; Upper entrance 250; Brackets
260; Sprocket
270,280; Pulley 275; Hose Seating Home
290; Reinforcing rib
300; Top mast
311, 312; Upper guide beam 320; Outer rail
340; Lower coupling member 345; Base part
360; crossbar
400; Carriage
420; Fork 440; Carriage frame
460; Carriage bracket 465; Carriage roller
510, 520; Main hydraulic cylinder
600; chain
700; Carriage Hydraulic Cylinder
800; Attachment Line
820; Inlet hose 840; Outlet Hose
900; View space

Claims (7)

A lower mast including a pair of guide beams having a rail formed on an inner surface thereof;
An intermediate mast coupled to the inside of the lower mast to move up and down;
A pair of sprockets coupled to the intermediate mast;
An upper mast coupled to an inner side of the intermediate mast to move up and down;
A carriage which is lifted and lowered on the upper mast;
One end is fixed to the lower mast, the other end is fixed to the upper mast, the chain via the sprocket;
A pair of carriage hydraulic cylinders fixed to a lower end of the upper mast to move the carriage up and down;
A pair of main hydraulic cylinders distributed and installed at both sides of the viewing space of the lower mast, and raising and lowering the intermediate mast; And
And an attachment line for supplying hydraulic fluid to the pair of main hydraulic cylinders and the carriage hydraulic cylinders.
In the first aspect,
The sprocket is
Forklift mast structure that can be secured to the visibility, characterized in that provided on the outer surface of the intermediate mast.
The method of claim 1,
The attachment line is
A forklift mast structure capable of ensuring visibility, wherein the attachment line widths are arranged in a line so as to overlap each other on the same vertical plane in the driver's field of view.
The method of claim 3,
The middle mast
And a pair of pulleys vertically coupled to the inner surface and passing through the attachment line.
5. The method of claim 4,
The pulley,
A forklift mast structure capable of securing a field of view, characterized in that the diameter of the pulley provided on the lower side is formed smaller than the diameter of the pulley provided on the upper side.
The method of claim 1,
When the upper mast and the middle mast descends,
A forklift mast structure capable of securing a field of view, characterized in that the width of the driver's field of view secured is 60 cm to 100 cm.
The method of claim 1,
When the upper mast and the middle mast is raised,
A forklift mast structure capable of securing visibility, wherein the driver's viewing space width is between 80 cm and 250 cm.
KR1020120056091A 2012-05-25 2012-05-25 A mast structure in forklift for a improving rangeof view KR20130132031A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180046799A (en) * 2016-10-28 2018-05-09 삼성물산 주식회사 lift up device for lifting high floor and high load
CN108529504A (en) * 2018-05-31 2018-09-14 安徽合力股份有限公司 A kind of multistage raising forklift door frame assembly
KR20210060871A (en) * 2019-11-19 2021-05-27 한양이엔지 주식회사 Weight lifter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180046799A (en) * 2016-10-28 2018-05-09 삼성물산 주식회사 lift up device for lifting high floor and high load
CN108529504A (en) * 2018-05-31 2018-09-14 安徽合力股份有限公司 A kind of multistage raising forklift door frame assembly
CN108529504B (en) * 2018-05-31 2023-08-04 安徽合力股份有限公司 Multistage lifting forklift mast assembly
KR20210060871A (en) * 2019-11-19 2021-05-27 한양이엔지 주식회사 Weight lifter

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