DE2713808A1 - Fork-lift truck lifting equipment - has rams between outermost flanges of H=section stationary columns - Google Patents

Abstract

The forklift truck lifting equipment comprises a stationary mast section fixed to the truck and one or more extending sections, each section consisting of two columns, and the extending one fitting between those of the stationary one. The lifting slide works on the extending section, being suspended from a chain reeved over a roller. A hydraulic ram is coupled between stationary and extending sections, and the columns are each of H-section, the webs being perpendicular to the planes in which the columns lie. Each ram (6) is mounted between the outermost flanges (4, 5) of the stationary mast section (2).

Description

Mast for lifters

The invention relates to a mast for the lift truck in the preamble of claim 1 specified genus.

The invention is generally based on the object of the visibility for the driver of the lift truck through the mast.

To solve this problem, it is known to instead of masts to use two lateral lifting presses of a middle lifting press and these behind to arrange the columns of the standing mast, (documents of DT-Gbm 1 880 289 and 1 877 9 l This arrangement has the disadvantage that behind the pillars of the Mast part of the space is required for the lifting presses. But there is the center of gravity of the load should be as close as possible to the front axle and therefore the columns of the mast should be arranged as far back as possible, depends on the arrangement of the lifting presses behind the pillars either that the pillars of the mast are arranged very far forward There must be a distance so that the center of gravity of the load becomes large or the pillars only can get a small extent in the vehicle longitudinal direction and therefore only may have insufficient rigidity, in particular for large lifting heights.

To gain free space in the middle of the mast is it is also known to use two lifting presses instead of a lifting press and These should be arranged close to the inside of the pillars (forklift truck type G 20 der Salev company executed in 1965). On the one hand, this creates a free one in the middle However, viewing space gained on both sides by the pillars and the Lifting presses concealed space significantly enlarged by a wide area, between which no gaps remain to look through. Thus, through this Embodiment, although at one point, an improvement in visibility achieved, but the visibility in the two side areas is essential deteriorated, so that when cornering or when pedestrians in from the side step on the road, the dangers are significantly increased.

It is also known to have a short one in the middle of a mast Cylinder and two chains placed on the side of this cylinder, which are diverted over more than one pair of rollers with multiple translation. at When the lifting carriage is lowered, there is a very good unobstructed field of vision to the front achieved. However, the cylinder must have a relatively large diameter, so that the view of the forks and the forward view when the load is raised is considerable is affected.

The special object of the invention is to improve the visibility to improve that a previously arranged in the driver's field of vision necessary Element, namely the lifting press or

the Hubpressenl arranged in a free space that is already present of which at least one inevitably present p <boundary wall in The driver's field of vision.

This object is achieved in that the lifting press or the lifting presses is arranged in the space between the outer flanges of the standing mast part or are.

This makes it possible to create a mast in which in the area No lifting press, i.e. no cylinder and no piston rod, is arranged between the columns is. With special Refinements in which between denyf pillars As I know a third lifting press is arranged, this can be a smaller one Maintained diameter than that of the previously known masts of the same lifting height or Extractability was possible.

There are various structural designs for masts according to the invention Embodiments, some of which are specified in the subclaims. All Common is the relatively good view through both the masts the roadway as well as the load handling equipment, for example forks, and on the load. The manufacturing costs of such masts are good rigidity small amount.

For example, the configuration according to claim 4 requires an additional one Lifting press in the middle, but enables full free lift of the lifting carriage, that is Raising the lifting carriage to its highest position opposite the extending mast part, before the telescopic mast part starts lifting. This also applies to the design according to claim The claims 8 to 10 relate to double extendable masts, wherein the subject matter of claim 10 in an analogous manner to the subject matter of the claims 2 and 3 the chain is fixed with one end to the middle mast part analogous to the attachment on the mast part in the subject matter of claims 1 and 2.

By distributing the load between two cylinders, these can be made smaller in diameter exhibit.

The embodiment according to claim 3 or claim 9 is through The dimensioning of the piston areas determines the sequence in which the pistons are extended Another constructively possible solution would be through an arbitrary or automatic depending on the extended position of the actuated valve, the order in which it is applied of the lifting presses and thus the sequence of extension.

A double extendable mast can be created by by placing a normal, easily extendable mast between two pillars and is connected to external lifting jacks, so that the columns that are in the normal frame themselves form the standing columns, the middle mast part, i.e. the outer extendable mast part, form.

The different possible solutions have different things in common. It is essential that the two pillars of the standing mast are made of double-T profiles are, between their outer flanges lifting jacks or at least on one side of the lifting frame a lifting press is or are arranged.

It is also within the scope of the invention, the two outer flanges a double-T-profile by a welded-on cover plate in such a way with one another to connect that these form a closed pressure space that is upward and down through each a cover plate is closed, the upper Cover plate is provided with a passage opening for a plunger. Included it must be taken into account that for an extending mast part (inner mast part) is known, to form this from U-profiles and one in the U-profile at approximately half the height Use web in such a way that a side wall of a pressure chamber through this web is formed (DT-AS 1 920 386). With such a configuration, the pressure increases the stiffness of the column in the pressure chamber.

The drawing shows five exemplary embodiments of the subject matter of the invention shown schematically.

Figure 1 shows an easily telescopic mast.

Figure 2 shows the same mast in the extended state Figure 3 shows a schematic plan view of the columns of the lifting frame.

Figure 4 shows a telescopic mast in a fully lowered position Location.

Figure 5 shows the mast according to Figure 4 also in a lowered position Position of the extendable mast part, however, with the fork carrier raised.

Figure 6 shows the mast according to Figures 4 and 5 fully extended and FIG. 7 schematically shows a plan view of the columns and Cylinder of the mast according to FIGS. 4 to 6.

Figure 8 shows a double telescopic three-cylinder lifting frame in fully lowered position.

Figure 9 shows the same mast in the position in which the first Step is extended and FIG. 10 shows the lifting frame according to FIGS. 8 and 9 in the fully extended position.

FIG. 11 schematically shows a plan view of the profiles of the columns and the cylinders of the mast according to FIGS. 8 to 10.

Figure 12 shows a double telescopic mast for full Free lift in 4 lowered position.

Figure 13 shows the mast according to Figure 12 with utilization of the Free stroke lifted fork carriage.

Figure 14 shows the mast according to Figures 12 and 13 in the position with the first stage extended and FIG. 15 shows the mast according to the figures 12 to 14 in the fully extended position.

Figure 16 shows a double telescopic mast with only two Lifting presses outside.

FIG. 17 shows the mast according to FIG. 16 with the first extended Step and Figure 18 shows the mast according to Figures 16 and 17 fully extended.

FIG. 19 shows a plan view of the columns and cylinders of the lifting frame according to Figures 16 to 18.

The mast according to Figures 1 to 3 corresponds to the other claims 1 and 2 and possibly 3 and consists of the lower cross member l on which the two standing mast columns2 are attached.

These standing mast columns 2 consist of a double-T profile with a Web 3. In the open interior space facing outwards between the outer flanges 4 and 5 of the standing mast profile 2, the cylinder 6 of a lifting press is arranged and firmly connected to the standing mast column 2 and the lower traverse 1. Via a line 7 is the working space of the cylinder 6 with a medium in the drawing no longer pressure source shown connected.

The piston rod 8 of the lifting press is via an upper connecting piece 9 connected to the extendable mast column 10. The two extendable mast columns 10 are over an upper cross member 11 connected to one another. On this upper cross member 11, the chain roller 13 is mounted in a roller block 12, via which the chain 14 is performed, on the one hand at the junction 15 with the lower traverse 1 is connected and on the other hand is connected to the sub-slide 16.

In the position shown in Figure 1, the piston rod 8 is complete retracted and thus the extending mast 10, 11 completely lowered At the Extending the piston rod 8 is via the connecting plate 9 of the extending mast part 10, 11 raised and thus the chain roller 12 raised so that the fork carriage 16 is raised at twice the speed as the extending mast 10, 11.

Of course, it is also within the scope of the invention if instead of a chain in the middle of the mast to improve visibility on each side of the mast in the space between each of the other extending mast columns 10 facing flanges of the double-T profile of the extending mast column 10 each one chain is arranged. It is also still within the scope of the invention if the extending mast column instead of a double-T-profile consists of a U-profile, its flanges according to eyes, i.e. facing the standing mast column. However, it is more economical Use double-T profiles.

The mast shown in Figures 4 to 7 corresponds to the claims 1, 2 and 4 and differs from the mast according to Figures 1 to 3 in that that in the middle another lifting press 17 is arranged, through the full free lift for the lifting carriage 16 can be achieved. Parts 1 through 11 and 16 are the same as in the mast according to Figure 1 to 3 but are different from that Mast according to FIGS. 1 to 3, the two extending mast columns 10 are not only through the upper cross member (crosshead) 11 but also through a lower one Cross member 18 connected, on which the cylinder 17 of the central lifting press stands. The piston 19 of this middle lifting press is on the piston rod 20 with a Roller bearing block21 connected, in which the two chain rollers 22 are mounted, wherein A chain 23 is guided over each chain roller 22, each of the chains 23 Connected to the cylinder 17 via a fastening member 24 and a bracket 26 and is thus connected to the extendable mast part 10, 11, 18.

The other end of each of the chains 23 is in turn connected to the lifting carriage 16 connected.

Starting from the fully lowered position shown in FIG of the lifting slide 16, the piston 19 first extends the piston rod 20 and lifts it thus the lifting carriage 16 via the rollers 22 and the chains 23. The interiors the cylinders 17 and 6 are in communication with each other. Because the area of the piston 17 is greater than the sum of the areas of the pistons in the cylinders 6 at At the beginning of a pressurization, the piston 19 differs from that shown in FIG Position in the position shown in Figure 5. Drive if the pressure increases further also the pistons in the cylinders 6, the piston rods 8 and thus lift over the upper connecting plates 9 the entire extension mast 10, 11, 18 together with the lifting press 17, 20 and the lifting slide 16.

In the case of the double extendable one shown in FIGS. 8 to 11 Mast, which corresponds to claims 6 and 7, are again parts 1 to 10, 16 and 18 are the same as in the mast according to Figures 4 to 7. Auf the lower cross member 18, however, is a lifting press with a in this case Cylinder27, a piston 28 and a piston rod 29, the upper end of the Piston rod 29 not only carries the chain roller carrier 30 but also with the upper one Cross member 31 is connected, which is firmly connected to the extendable mast columns 32. The two chain rollers 33 are mounted on the chain roller carrier 30, via which in turn Chains 23 are guided via chain attachment links 25 and arm 26 with the cylinder 27 are connected. In this case, too, is the other end of each chain 23 connected to the lifting carriage 16.

Starting from the position shown in FIG. 8, it moves when pressure is applied thus the piston rod 29 and initially lifts over the roller carrier 30 Chain rollers 33 on and thus the lifting carriage at twice the speed 16 until the piston rod 29 comes to rest with the upper cross member 31 like shown in FIGS. 9 and 10. As soon the piston rod 29 rests against the upper cross member 31, it also lifts the standing mast columns 32 up to the position shown in FIG. Drive with further pressurization then also the piston rods 8 from the cylinders 6 and lift the inner extending mast columns 10 with the cross member 18 up to the position shown in FIG.

The mast shown in Figures 12 to 15 corresponds to Claim 8. Here again, parts 1 to 10, 16 and 18 are the same as in the lifting frame according to FIGS. 4 to 7. In the embodiment according to the figures 12 to 15, however, a duplex lifting press is supported on the lower cross member 18. The piston rod 38 is supported on the lower cross member 18. At the Piston rod 38 is attached to piston 39, which is slidable in cylinder 40 is. A piston ring surface 41 is in turn attached to the cylinder 40, on which the cylinder 42 slides sealingly. The roller supports 44 are attached to the cylinder 42, on which the chain rollers 43 are mounted. The guided over the chain rollers 43 Chains 23 are fastened in fastening links 45, each of which has a lower Connecting member 46 is connected, which in turn is fixed to the cylinder 40 connected is. The cylinder 40 is still fixed to the upper cross member 47 $ bound, which is firmly connected to the extending mast columns 48.

The pressureless state is shown in FIG. At beginning Pressure supply is the pressure first in a manner not shown in the drawing guided into the annular space 49 above the annular piston surface 41, so that the cylinder 42 lifts and thus takes the chain rollers 43 with it via the chain roller carrier, see above that the lifting carriage 16 is raised relative to the inner extension mast part 47, 48 will. With further pressurization, the pressure in the pressure chamber 50 is above of the piston 39 passed so that the cylinder 40 moves up and over the upper cross member 47 pushes the inner extension mast 47, 48 up to the position shown in FIG Position while the outer extension mast part 10, 18 remains in the lowered position.

This is the highest position compared to the extension mast 10, 48, 47 of the lifting carriage 16 achieved by acting on the middle lifting press can be achieved. If the pressure is increased further, the piston rods move 8 in the cylinders 6 and take the columns 10 via the connecting plates 9 of the outer extension mast part 10, 18 with, so that the entire extension mast from a whole is raised evenly.

The embodiment according to FIGS. 16 to 19 corresponds to this Claim 10 and differs from all previous embodiments mainly because between the outer flanges 54 and 55 of the standing mast columns 52 a lifting press 60 is arranged from the to both sides One piston rod is extendable each. The standing mast columns 52 are on the lower Cross member 51 is supported on which also the downward extendable piston rod 57 is supported, while the upwardly extendable piston rod 58 with the upper Cross member 61 is connected. The cylinder 60 is through the connecting plate 59 connected to the outer extending mast column 62.

The upper cross member 61 is connected to the inner extending mast columns 65 connected and with the chain roller carrier 64 on which the chain roller 63 is mounted is, on the turn of which the chain 23 is guided, which at one end to deni Lifting carriage 60 is attached and at its other end via a connecting link 66 is connected to the lower cross member 68, which in turn with the two outer extending mast columns 62 is connected.

The piston 67 is connected to the piston rod 57 and to the piston rod 58 the piston 69 is connected.

FIG. 16 shows the unpressurized state with the lifting carriage fully lowered 16 shown. When pressure is applied, the pressure first reaches the pressure chamber 60 with the result that the piston rod 58 is raised and thus over the upper one Cross member 61 as well as the inner extending mast columns 65 even the chain roller 63 is raised so that the lifting carriage 16 relative to the inner extension mast parts 65 is raised, but at the same time also this extension mast is raised. When further pressure is applied, the cylinder 60 moves on the piston rod 57 high and thus takes the outer extending mast columns via the upper connecting plate 59 62 with the cross member 68, so that the extending mast 62, 68, 65, 59 as a whole is booted up.

In this embodiment, too, it is of course possible for the purpose further improvement of the visibility instead of a chain 23 in the middle to place two chains between the inner flanges 71 and 72 of the telescopic mast columns 65 are performed. It is also still within the scope of the invention if the column 65 instead consists of a double T-profile from a U-profile or another profile and when the pillars 52, 62 and 65 are mutually mutually different in a different way as shown in the drawing.

Patent claims:

Claims (13)

Claims: Vj lifting frame for a lift truck (forklift) with a stationary mast part connected to the lift truck and at least one demountable mast part, each mast part consists of two columns and the Ausrahrmastteil between the two columns of the standing mast part is arranged, with one on the extending mast part displaceable lifting carriage hanging on a chain guided over a roller and at least one hydraulic press (cylinder with piston) of which a part with the standing mast part and at least one other part with a movable part of the mast is connected, the two columns of the standing mast part from each consist of a double-T profile whose web is at least approximately perpendicular to the Is the level in which the two pillars lie, characterized in that the or one lifting press (6, 60) each in the area between the outer flanges (4, 5) of the standing mast part (2, 52) is arranged. 2.) mast according to claim 1, characterized in that each a part, preferably the cylinder (6), of each of the two outside between the flanges (4 and 5) of the standing mast columns (2) arranged lifting presses with the Stand mast part (2) and the other part, preferably the piston rods (8) is connected to the single extension mast part (10, 11). ).) Mast according to claim 2, characterized in that the one hand with the lifting carriage (16) connected chain (14) via a on the extending mast part (10, 11) mounted roller (13) is guided and on the other hand attached to the standing mast part (1, 2) is. 4.) mast according to claim 2, characterized in that the extension mast part (10, 11, 18) is provided with a lower cross member (18) on which another Lifting press (17, 20) is supported, the extendable part (20) of which the roller or rollers (22) carries over which the chain or chains (23) is or are, which on the other hand is attached to the extension mast part (10, 18). 5.) Lifting frame according to claim 4, characterized in that the piston surface the further lifting press (17, 20) is greater than the sum of the piston areas of the outside arranged lifting presses (6, 8). 6.) Double extendable mast according to claims 1 and 2, thereby characterized in that the two auschen the flanges (4, and 5) of the standing mast columns (2) arranged lifting jacks are single-acting and on the one hand with the standing mast (1> 2), on the other hand with the middle mast part (outer extendable mast part) (10, 18) are connected and that on the central mast part (10, 18) a further lifting press is supported, on whose relative to the central mast part (10, 18) displaceable Part (29) the roller or rollers (33) for the chain or chains (23) is mounted or are stored. 7.) mast according to claim 6, characterized in that the middle Lifting press (27, 29) has a piston, the piston rod (29) of which with the highest Extendable Mxtteil (inner extendable mast part) (32, 31) connected or connectable is. 8.) Double extendable mast according to claim 6, characterized in that that the middle lifting press (38 to 42) has a piston surface that with the roller or the rollers (43) for the chain or the chains (23) is connected, the Chain or «Each chain (23) on the other hand with the one with the highest extendable Mast part (27.48) connected cylinder (40) of the middle lifting press is connected, the piston (38) of which can be extended downwards and to the central extension mast part (10, 18) is connected. 9.) mast according to claim 8, characterized in that the with the piston area connected to the rollers (43) is the largest and the sum of the piston areas the outer cylinder (6) is smaller than the piston area of the middle one Lifting press (40). 10.) Double extendable mast according to claim 1, characterized in that that from the cylinder (60) each of the two outside between the flanges (54 and 55) of the mast columns (52) arranged lifting presses both upwards and downwards at the bottom One piston rod (57 or 58) can be extended, with the one at the bottom extendable piston rod with the mast part (52, 51) of each of the cylinders (60) with the middle mast part (outer extendable mast part) (62) and each upwards extendable piston rod (58) connected to the most extendable mast part (65) is and that on this (65th) the roller (63) for the chain (23) is mounted, whose one end is connected to the central mast part (62). 11.) Lifting frame according to one of the preceding claims, characterized in that that the pressure chamber of the outer lifting press through the web and the two outer flanges the columns of the mast part and a plate connecting these flanges as well an upper and lower end plate is formed. 12.) Mast with a hydraulically operated device on the lifting carriage according to one of the preceding claims, characterized in that the hose or the hoses for the device in the same parallel to the longitudinal plane of the vehicle Level how the chain or chains are arranged. 13.) Lifting frame according to one of the preceding claims, characterized in that that also the columns of the highest extendable mast section made of double-T profiles exist and that the lifting carriage is suspended from two chains and that these are in space between the inner flanges of the double-T profiles of the highest extendable Mast part are arranged.