DE1431608A1 - Three-stage column arrangement for lifting vehicles - Google Patents

Description

Three-stage column arrangement for lifting vehicles.

The invention relates generally to a three-stage, telescopically extendable column or column mounted on a lifting vehicle Mast arrangement, a lifting fork or another in such Lifting vehicles used, carries a load sensing device. In particular, the invention relates to an improvement three-tier column arrangements of the type described in the ongoing United States continuation application Ser. No. 111 070 of 18.5 * 1961 to the names Hastings, Jr. and oven is disclosed.

It has been a problem for a long time with lifting vehicles of the type mentioned has been to provide a structure that allows the vehicle operator a good view through the pillar assembly

- 2 -

809807 / 01U

enabled when the load sensing device is in which is or near the lowest position. The present invention relates to a new combination of a telescopic op-pillar arrangement with a hydraulic lift cylinder or piston and a double lift chain arrangement on each side the column, which together have a compact construction with a relatively low height when retracted and allows a large head and grants the operator significantly improved visibility. It is therefore It is a basic object of the invention to provide an improved three-stage telescopic column assembly that is convenient for the operator excellent light conditions guaranteed through the arrangement "

Another object of the invention is to provide a column assembly for lifting vehicles with an improved combination of lifting elements, such as the chains in the column arrangement are included and are arranged in such a way that a maximum area of application of the column arrangement is guaranteed is.

Another object of the invention is to provide a three-stage Pillar arrangement for lifting elements of lifting vehicles, such as ZeB. Chains in which a pair of such chains on each one Side of a lifting cylinder is arranged, each pair of lifting

- 5 -80 98 0 7/0 IU

elements is mounted on chain gears or bath elements that have a transverse axis to the lifting vehicle, while the other pairs of lifting elements are mounted on sprockets or wheel elements, one in the longitudinal direction the vehicle's axis, creating a combination of lifting elements is created, which has a very disruptive influence on the sealing conditions of the operator keeps it small.

Further objects and features as well as advantages of the invention will become apparent to those skilled in the art from the following description of an exemplary embodiment of the invention is in accordance with the invention a mast arrangement with laterally spaced apart fixed column or stand arrangements provided on the lifting vehicle are attached. Such pillars or stands contain a side protruding forward and nested within one another mutually arranged pair of extendable columns, each of which is preferably double-T-shaped in cross-section. tuck Extensible columns also contain one laterally spaced apart from one another protruding forward and nested within one another second pair of extendable columns, each of which is also preferably double-T-shaped in cross-section at the front is. The load carriage is arranged so that it is in the Inside the retractable columns is moved up and down, and it

are sets of roles between the pairs of columns and between the inner pair of pillars and the load carriage provided to at Raising and lowering the load carriage and the extendable columns ensure safe guidance both in the longitudinal direction and in the to reach sideways direction.

JjJine's preferred roller design is detailed in the aforementioned US patent application. A hydraulic piston device that can be extended in the vertical direction is arranged centrally to the column arrangements at the lower end of the first extendable column arrangement,! in an intermediate cylinder the telescopic piston assembly carries a pair laterally of one another spaced chain sprockets through which a pair of laterally spaced chains who are excited with one of their youngsters on the outer cylinder the piston arrangement and with the other one on the load sole are anchored. The first pair of chain sprockets rotates around an axis running transversely to the lifting vehicle. Jis is still a laterally spaced a second pair of sprockets near the lower end of the first extendable Column is provided which rotates about axes pointing in the longitudinal direction of the vehicle. A second pair of lift chains is on preferably with one end on the outer cylinder of the telescopic piston and with the opposite end near the top

attached to the fixed pillars.

- 5 -

809807/0114

A preferred embodiment of the invention is explained in more detail in the drawing. In the drawing show:

Fig. 1 is a front view of a lift truck with to the end the inner column lowered lifting carriage, which ensures good visibility for the operator shows through the column assembly;

FIG. 2 is an enlarged rear view of the one shown in FIG. 1 . Column part that extends above the front part of the lifting vehicle, as well as part of the driver's seat;

Fig. 5 is an overall rear view of the column assembly shown in Fig. 1; with the entire column assembly removed and the load carriage at the bottom;

FIG. 4 shows a view of the column arrangement according to FIG. 3j in which of the load carriage is almost in the uppermost position of the retracted column arrangement;

Figure 5 is a rear view of that in the previous figures The column arrangement shown on a slightly smaller scale, with the entire arrangement in a central stroke position is located and both extendable column assemblies are partially extended;

6 shows a partially broken away representation of the column arrangement according to FIG. 5, but in the maximum stroke position of both the carriage and the column arrangement;

- 6 809807 / 01U

143160S

7 is a top view of the column assembly in FIG Slide position according to Fig. 4- and

8 shows a partially broken away illustration of the telescopic piston arrangement used in the column arrangement, partly in. Cut.

A conventional industrial lift truck is denoted by 10 a üahnien- and frame construction 12, which on a pair Not shown control wheels at the end and a pair of drive wheels 14- is arranged at the end of the door, and with a suitable one Drive device, e.g. an electric drive or a gas drive, for operating the vehicle from the driver's cab the end. This driver's cab 16 comprises a driver's seat which is arranged above the motor housing, a foot lever for the driver, like SoB. Accelerator pedal and brake pedal (not shown) and a plurality of hand levers and gauges, such as it is shown in FIG. The operating elements include a steering wheel 18, a control lever 20 for operating the column assembly and a power transmission control lever attached to the control column. An operator is shown in Figo 1 with 22 as it appears to an observer from the front of the lifting vehicle when the person is in the normal position on the lift truck.

809807 / 01U

The column arrangement according to the invention is generally indicated at 30
referred to, namely the arrangement on the lifting vehicle
provided with the aid of a pair of rearwardly extending support plates 32, which are fastened to a lower fixedly arranged transverse plate 34 of the column arrangement and by means of openings 36 on bearing parts of the drive axle
(not shown) is rotatably mounted. Hold support arms 42
the upper ends of the panels 32 on a lower fixed mast portion 38 spaced a pair transversely from one another
comprises arranged mutually directed grooves 40 with a substantially C-shaped cross section. The Hinnen 40 are like this
designed and arranged to have a middle. Pick up mast part 44, which is formed from two transversely spaced apart double T-beams 46. The middle mast part 44 is mounted on rollers and is movable with respect to the fixed mast part 38 in the longitudinal direction, as
it is described below. In addition to the central extendable part 44, there is an inner extendable mast part 48 which is spaced apart from one another in the transverse direction
arranged double T-beams 50 is made within the
Double-T-beams 46 are arranged and are movable with respect to the fixed mast part 38 and the central mast part 44 in the longitudinal direction. The inner mast part 48 is also mounted on rollers and is in the longitudinal direction with respect to the central part 44

ORIGINAL INSPECTED

device ". A load or fork sole 51 is known in the art Way mounted on rollers in the inner mast part 48 and can be moved up and down. A support arm 52 extends from each gutter 40 to the rear and is not with one shown swivel cylinder connected for the string arrangement, which is attached to the vehicle to achieve a longitudinal pivoting movement.

The mast part 38 is to increase the strength with the help of Cross stiffeners 53 and 54 (in addition to the lower stiffener 34) stiffened transversely. The middle mast part 44 is with the help of upper, middle and lower cross stiffeners 56, 58, 60 stiffened transversely and the inner mast portion 48 is stiffened by upper, middle and lower stiffening members 62, 64 and 66 stiffened transversely. The upper cross stiffeners of the respective mast parts are offset from one another in the vertical direction, so that mutual interference is avoided. The stiffeners 64 and 66 of the inner mast and 58 »60 of the middle one Mastes are arranged so that they are within the various other cross braces when extending and retracting the column assembly can move past each other.

The inner double T-mast part 48 is in the middle mast part 44 nested in such a way that the front rails of the double

809807 / 0-114

T-beams 50 outside the front webs of the double-T-beams 46 and the rear webs of the double T-beam 50 within the adjacent inner part. And in front of the rear webs of the Double T-beams 46 lie. Sets of rolls are suitably positioned between the adjacent nested I-beams 46 and 50, which each double-T-beam Support 50 in the longitudinal direction and transverse direction and enable an extension in relation to the adjacent double T-beam 46. The upper lumps of each roller set are shown in 3Fig. 7 denoted by 70. The double T-beams are in the same way 46 of the first extendable mast part 44 forward with respect to FIG the web parts of the outer fixed grooves 40 of the mast part 38 are arranged offset and are also outside the Troughs 40 telescopically movable on sets of rollers. These rollers support the I-beams 46 in the longitudinal direction and transverse direction with respect to the channels 40. The upper rollers of the last-mentioned roller sets are designated by 72. On, the upper one At the edge of the channel-shaped carrier there are cutouts 76 and on the Upper ends of the double T-beams 46 cutouts 76 are provided (Fig. 1), so that the rollers in the respective mast parts in front whose assembly can be performed. The cutouts in the upper part of the webs enable the rolls to be guided past during the assembly of the column parts and the use of rollers 70 and 72 of relatively large diameter, the

- 10 -

809807/0114

- ίο -

through the respective cut-out web parts extend. The rollers are mounted on the upper ends of the column supports 40 and 46, respectively. -

The load carriage 51 is in "a known manner" in front of the column arrangement arranged, which has a pair of fork elements 80 (Fig. 7) spaced apart from one another in the transverse direction, which are attached to the load carriage and upper and lower Bear rollers that guide the carriage within the trough parts of the double T-beams 50 and enable a lifting movement. A pair of side pressure rollers 84 are connected to the load carriage and roll along the outer protruding edge portion each inner double T-beam 50o The pair on the side Pressure rollers 84 work in conjunction with the inner carriage support rollers 82 to prevent the column assembly from being pulled apart becomes or jams when the load carriage is loaded eccentrically, and to absorb lateral compressive forces acting on the load carriage. The details of the nested double T-beam column arrangement, the storage of the load carriage on this and the arrangement of the Role sets, as already explained, is already mentioned in the above. US patent application described. It is therefore unnecessary a detailed explanation in this application. The special meaning of the forward intertwined

- 11 -

809807 / 01U

nested column assembly of the present invention in that such a column arrangement is combined with the new chain arrangement, so that an improved column arrangement is created, as can be seen from the following description

A hydraulic piston assembly with multiple telescopic cylinders is in Pig. 8 generally designated 90. The order essentially comprises five tubular elements that are concentric are arranged and slidable into one another. The inner tubular member 92 is at its lower end 94 on the fixed arm 34-am attached to the lower end of the fixed "column 38, and it is connected at 96 with the aid of a flexible conduit (not shown) connected to a pressure pump and thus serves as a fixed upright line for the supply of the pressure medium to the hydraulic Piston assembly 90 via a controllable valve assembly 98 at the upper end of inner tube 92. The length of tube 92 is somewhat smaller than the outer column part 38 »an inner tubular one Component 100 is at its lower end on the v ^ uerarm 60 fixedly arranged between the carriers 46. The tube 100 is open at the top and bottom and is provided with seals 102, which slide on the wall of the inner guide tube 92, as well as with a stop 104- which opens against a stop 106 the guide tube 92 abuts when the tube 100 is fully extended (Figure 6).

- 12 -

A one-piece inner roll-shaped Pressure piston assembly 108, 110 is at 112 by screwing " attached and acts as the only telescopic piston unit. It comprises a tube 100. The inner tube 108 of the arrangement is somewhat shorter than the height of the outer mast part 40 and is closed at the upper end 114. The upper end 114 is at 116 attached to the upper cross arm 62 of the inner mast part 48 in a suitable manner. In the elongated annular gap between the tubes 108 and 110 is a central hydraulic tubular piston 120 that is about half as long how the outer column part 38 is and on its upper end a transverse bearing 122 is arranged, on which a pair of sprocket wheels 124 are located on outer Axle stems 125 around a transverse to the column arrangement Axis are rotatably mounted. Suitable annular seals are at 126 on the upper end of the outer tube 110, at 128 on provided at the lower end of the extendable inner tube 100 and at 130 at the upper end of the transverse bearing of the telescopic central tube 120. At the upper and lower ends of adjacent telescopic tubes, pairs of stops are provided to limit the mutual displacement. In the pipe 92 are at 132, in the inner tube at 134 and in the inner telescopic tube 108 at 136 a plurality of openings distributed over the circumference, which the various Connect elongated annular gaps between the adjacent pipes with each other. ._

809807 / 01U

An anchor plate is attached to the outer tube 110, e.g. by welding 140 attached. This plate 140 includes a pair of lugs 142 and 14 disposed on opposite sides of the plate 140 a pair of rearwardly extending lugs 144. Mn first Pair of laterally spaced chains in the transverse direction run over sprockets 124 on transverse bearing 122. They are anchored securely at one end on the load carriage 51. The chains 146 have their other end at the lugs -142 of the Anchor plate 140 attached with the aid of a pair of long bolts 148, which penetrate the openings in the lugs and are connected to them by screwed-on nuts. Thus can the pair of chains 146 in the first lifting stage of the column arrangement when the pressure medium is connected to the telescopic piston arrangement 90 the load carriage 51 from the in lig. 3 shown lowest Raise position to the "free stroke" position shown in FIG. 4 when the center piston cylinder 120 is initially up along the extendable inner tube 108 is moved, whereby the transverse bearing 122 and the sprockets 124 the load carriage in relation 2: 1 of the movement of the cylinder 120 and cause such a free lifting movement of the load carriage, while the Telescopic mast parts 44 and 48 remain in their lowermost position within the outer mast part 38. When the load carriage is in a fully free stroke position, the cylinder 120 is fully extended with respect to the cylinder 108.

- 14 -

809807 / 01U

drive, and it will touch the stops at the bottom of the Cylinder 120 the stops at the upper end of the outer cylinder 110. Pressure medium acts on a surface at the bottom of the inner-outer Cylinder assembly 108, 110 to keep this assembly down while cylinder 120 is being extended, and the anchor plate 140 thus remains in a fixed position lower position, as shown in Figs.

A second pair of transversely spaced apart Chains 150 are at right angles to chains 146, generally behind them. This The pair of chains is located essentially in a plane running transversely to the vehicle and runs over a pair in the transverse direction spaced apart chain sprockets 152, which on stub axles at the lower end of the central mast part 44 are rotatably mounted on the arm 60, to be precise in the longitudinal direction axes of the vehicle. The chains 150 are ■ with one end by long bolts 154 to the rear extending lugs 144 of the anchor plate 140 anchored. The opposite ends of the chains 150 are on the upper arm 53 adjacent the upper end of the outer fixed mast member 48 by a pair spaced transversely from one another located support arms 158 (Fig. 2) firmly connected, which are behind the rear webs of the double T-'fräger 46 of the central

- 15 -

80 9807/0 1 U

leren mast 44 are and liier are nested, and which extend inwardly and forwardly from the arm 53 so as to arrange the chains 150 in a plane to enable and furthermore an engagement of the upwardly extending lengths of the chain pair (Fig. 2-5) behind the webs of the inner double-T-beam 50. The mast parts 44 and 48, which are nested in one another towards the front, and the outer one Mast part 38 cause a distance that is necessary to the pair of chains closely and effectively behind the column assembly and the To nest piston cylinders so that the pair of chains 150 does not substantially block the driver's field of vision through the column arrangement through when the load carriage is in any lifting position ..

The mode of operation during the second phase of the stroke from the lifting position of the load carriage shown in FIG maximum lifting height according to FIG. 6 is the following: The further connection the pressure medium with the piston-cylinder arrangement 90 causes an extension of the inner-outer tube arrangement 108, 110 together with the middle cylinder 120 outside to the inner piston cylinder 100 and a lifting of the latter piston cylinder with the middle mast part 44 and outside along the pressure supply 92. If the pressure medium continues to Piston assembly is supplied when the load carriage is in the position shown in Fig. 4, causes the simultaneous Extension of the middle cylinder 120 and the inner outer cylinder assembly 108, 110 a lifting of the anchor

η r \ λ » η λ η / r \ 1 Λ /

-.16 -

plate on the outer cylinder 110, whereby the chain pair * i? CF is tensioned, so that these chains simultaneously cause the middle, mast part 44 to fall out of the outer mast 38, which in turn raises the inner piston cylinder 100 on the feed cylinder 92, Since "the cylinder 100 is attached to the outer arm 60 near the lower and lower part of the middle mast part," as can be seen, when the middle mast part is raised by the chain 150, the inner mast part is called 48 extended from outside the middle mast section 44. Thus the telescopic mast parts 48 and 46 are extended simultaneously from the position shown in FIG. 4 into a middle position according to FIG. 5 and then to a maximum lifting height , as shown in Fig 6 'During this lifting operation the chains 146 hold the ^load.:. sled 51 at the top of the inner mast 48 üinde and it wJUftfet the telescopic piston arrangement on the medium n mast 44 with the help of chains 150, and it causes the arrangement of the sprockets 152. such an extension of the telescopic mast parts in relation to the fixed mast part 38. Ice is thus a smooth and continuous lifting process on the load carriage 51 from the lowest position Executed up to the highest position with a constant lifting speed, as is desirable S- -.- ..:. ■ -. '

8 0 98 07/0 I 14

! feck knowledge of the applicant is so far a three-stage yelesfcop-Öäulenanordnung not known that a . allows completely free operation of the lifting carriage and enables a good view of the operator at all times during the entire lifting process. For representation "In Fig. 1 it is suggested that when the load carriage is loaded, i.e. something in one position of the loaded load carriage Above its lowest position, the operator has an itapcliblick option in the form of a window through the coil arrangement Has. Disturb during the lifting process from the lowest position to the maximum lifting height of the load carriage chains 150 are never out of view of the operator essentially mass, which, to the knowledge of the applicant, has never been achieved with such a column construction, is. It should be mentioned again that the chains 150 are constantly: behind the webs of the inner mast part 48 or substantially behind the tubular elements of the cylinder-piston assembly are nested so that these chains never disturb the operator's eyes to any significant extent. In the case of the known three-stage column arrangements, this result has never been achieved.

it is within the scope of the present invention, a Chain arrangement of the type described with roller columns in front

- 18th

809807/0114

in which there are no parts nested in front of one another, as is best shown in connection with FIG is provided in the longitudinal direction of the lifting vehicle for receiving part of the chains behind the web parts of the mast parts, as has been described above. It is also possible to provide a chain arrangement in sliding columns which has no mast parts running on rollers, although such an arrangement is obviously is not economically feasible. 'JSs is further noted that the chains at a distance located ends can 150 to the. inner in the transverse direction from each other not only be attached to an anchor 140 which is disposed on the outer cylinder 10 but also ψ in completely equivalent to an anchor, for example on the cross arm 64 of the inner mast part 48 can be attached, since the outer cylinder 110 and the inner mast part 48 never perform a relative vertical movement against each other.,

Although a preferred embodiment of the above Invention shown, it is understood that changes to the construction, the particular shape and the relative arrangement of the parts can be made without departing from the inventive concept.

- 19 809807 / 01U.

Claims (1)

- 19 claims. 1.) j Mast arrangement for lifting vehicles with one outer, one middle and an inner column part, which are arranged telescopically, the outer column part on the vehicle is attached and a load carriage is movably mounted on the inner column part in the longitudinal direction of this inner column part is, and with a jiscpansionsvorrichtung with three concentrically arranged, relative to each other displaceable elements, of which the first julement with the middle Column part, the second element with the inner column part and the third jfilement connected to the load carriage and is movable along the second jfilement, ' ^: ■ ■''''red ■ is characterized by a first chain arrangement, which is rotatably mounted on the third expansion element about an axis directed transversely to the vehicle, by a second chain wheel arrangement, which is mounted on the central column part about a longitudinal direction of the vehicle extending axis is rotatably supported by a first chain arrangement, which is fastened with one end to the inner column part, runs over the first chain wheel arrangement and is fastened to the load carriage with the other Jünde, and by a second chain arrangement which is fastened with one end to the inner column part is around under the second sprocket assembly - 20'- 'ORIGINAL INSPECTED 809807/01 U and with the other "end on the upper part of the outer column part is attached. 2.) mast arrangement according to claim 1, characterized in that the inner column part forward in the middle Column part and the middle column part is arranged offset to the front in the outer column part, by one forward extending vertical gap between the rear ends of the inner and outer pillar parts to create, in which the vertically extending second chain arrangement is at least partially arranged, behind the rear end of the side of the inner column part. 3.) Mast arrangement according to claim i, characterized in that that the second sprocket assembly includes a pair of sprockets or sprockets that are transverse to each other spaced apart and around transversely from each other remotely arranged, longitudinally extending axles are rotatably mounted, and that the second chain assembly comprises a pair of chains extending below outwardly opposite sprockets in opposite directions and in the area of the upper end of the outer column part attached separately - 21 - 8 0 9 8 0 7 / Q 1 U are, resulting in the least possible impairment the field of vision through the mast arrangement during operation of the! vehicle is reached " 4-.) Mast arrangement according to claim 3i, characterized in that that the sprockets of the second sprocket arrangement lie essentially in a common plane and in Transverse direction a greater distance from each other 'than the sprockets of the first sprocket arrangement. 5.) Mast arrangement for a lifting vehicle with three column parts, of which the first pillar part is attached to the vehicle in the vertical direction, the second pillar part on the first mast part is movably mounted in the vertical direction and the third mast part on the second mast part is mounted movably in the vertical direction, with one mounted movably along the third mast part Load carriage and with a lifting cylinder arrangement arranged between the second and the third mast part, consisting from a first hydraulic cylinder with substantially the length of one of the column parts, which is connected to the ■ the second column part is connected, from a second hydraulic cylinder displaceable on the first cylinder, which is connected to the third column part and has substantially the length of a column part, and from - 22 809807 / 01U U316Ö8 ..- 22 - a third hydraulic cylinder of half the length of a column part which is slidably mounted on the second cylinder ■, characterized by a first chain wheel rdnung, which is arranged at the upper end of the third cylinder and around an axis running transversely to the vehicle is rotatably mounted, by a first chain arrangement attached at one end to the third column part, which extends over the sprocket assembly and is attached at the other end to the load carriage, by a second, arranged at the lower end of the second column part and around a rotatable axis extending in the longitudinal direction of the vehicle Sprocket assembly and by a second chain assembly which is connected at one end to the third column part extends below the second sprocket assembly and at the other end to the upper end of the first Column part is connected. 60) mast arrangement according to claim 5 »characterized in that the hub cylinder assembly has a fourth hydraulic cylinder which is attached to the second cylinder and slidable with respect to the third cylinder, the fourth cylinder and the third column part are immovable relative to one another, that one arranged on the fourth cylinder Anchor is provided and that one end of the first and second chain assemblies is attached to this anchor. 80 9807/0114