EP3689813A1 - Reach truck - Google Patents

Abstract

Reach truck with a drive part (100) and a load part (200) mounted on the drive part so as to be movable relative to the drive part, the wheel arms of the drive part being connected to one another via a transverse connector coupled to the load part.

Description

The invention relates to a reach truck with a drive part and a load part, the drive part comprising a drive frame with two mutually parallel wheel arms and a base frame connecting the wheel arms, a first guide means being arranged on the wheel arms, the load part comprising a mast holder two parallel side arms and a cross member connecting the side arms, a second guide means being arranged on each of the side arms, the side arms of the mast holder extending parallel to the wheel arms of the drive frame, so that one of the side arms runs adjacent to one of the wheel arms, wherein the first guide means of one wheel arm interacts with the second guide means of the adjacent side arm in such a way that the mast holder is movably guided on the wheel arms.

Reach trucks of this type are used to move goods, especially in confined spaces. In contrast to self-supporting forklifts, the stability of reach trucks is generally not achieved by a counterweight, but rather by means of wheel arms extending from the front of the reach truck. These wheel arms form part of the drive frame of the reach truck, wherein a motor, for example an electric motor including batteries, can usually also be arranged in the drive frame. The load part, which usually comprises a mast holder and an extendable mast arranged on the mast holder, is guided on the wheel arms via guide means. This guidance takes place via guide means arranged on the side arms of the mast holder and enables the mast holder to be moved along the wheel arms of the drive frame. By guiding the mast holder on the wheel arms of the drive part, the load part is supported against the ground by the wheel arms or by wheels arranged on the wheel arms.

A force dependent on the weight of the goods being transported on the load part consequently bears on the wheel arms and, depending on the extended position of the mast holder along the wheel arms, causes the wheel arms to spread apart to different extents. Among other things, this can endanger the transport of the goods and damage the reach truck. In order to counteract such a spreading of the wheel arms, the wheel arms can be connected to one another in the region of the base frame by different reinforcing means. For example, a connecting plate extending parallel to the floor can be provided, which - in addition to the base frame - connects the wheel arms to one another. A traverse can also be provided, formed for example by a further connecting plate which extends perpendicularly with respect to the floor from one wheel arm to the other. Such reinforcing means, however, are expensive to assemble, particularly as welding assemblies. In addition, reinforcing means of this type essentially prevent the spreading of the wheel arms only in the region of the base frame, while spreading is not optimally counteracted at the free ends of the wheel arms.

From the as yet unpublished EP 18 188 274.7 a reach truck is known which counteracts the spreading of the wheel arms with L-connectors, which each extend from a side arm to the adjacent wheel arm and engage behind it in a clamped manner. The forces spreading the wheel arms are thus countered by the side arms and thus ultimately by the mast holder itself.

On the basis of the explained prior art, the object of the invention is to provide a reach truck which ensures safe transport of the loads over the entire push path even with large loads.

The invention solves the problem by the subject matter of claim 1. Advantageous refinements are the subject matter of the subclaims, the description and the figures.

The reach truck according to the invention of the type mentioned initially comprises a cross connector which extends from one wheel arm to the other wheel arm and connects the two wheel arms to one another. According to the invention, the cross connector is movably guided on the wheel arms together with the mast holder and is in engagement with the wheel arms via bearing elements in such a way that the cross connector limits movement of the wheel arms away from one another.

The mast holder forms a U-shape with its cross member and the side arms extending from it, as does the drive frame with its base frame and the radar arms extending therefrom. As explained at the beginning, the mast holder and thus the load part of the reach truck is guided over the wheel arms on the drive frame and thus on the drive part. For this purpose, first guide means arranged on the wheel arms are provided, which interact with second guide means arranged on the side arms. One side arm is guided on the respective adjacent wheel arm via the respective first and second guide means. The U-shaped mast holder is thus mounted within the U-shaped drive frame. Looking in the direction of travel of the reach truck, this results in a left arm pair consisting of the left wheel arm and the left side arm, and a right arm pair consisting of the right wheel arm and the right side arm. The entire load part can be extended in the direction of travel of the reach truck and retracted against the direction of travel of the reach truck via the mast holder, the side arms moving along the wheel arms.

According to the invention, a cross connector connecting the wheel arms is now provided. The cross connector extends across the wheel arms, can in particular, are perpendicular to the wheel arms. The cross connector can comprise an elongated connecting element which runs from wheel arm to wheel arm. In particular at the opposite longitudinal ends of the connecting element, the bearing elements can be provided with which the cross connector is in engagement with the wheel arms. Corresponding bearing elements can be provided on the respective wheel arms. The cross connector can make the connection between the wheel arms in particular only via these bearing elements. According to the invention, the cross connector is in engagement with the wheel arms in such a way that it limits outward movement of the wheel arms from one another. For example, the cross connector can clamp behind the wheel arms by means of its bearing elements and thus limit the movement of the wheel arms away from one another.

The cross connector can thus counteract the spreading of the wheel arms mentioned at the beginning. So if a weight is stored on the load part, for example on a mast connected to the mast holder, its weight is distributed over the wheel arms, which results in a force spreading apart the wheel arms. This spreading force pushes the wheel arms away from each other, that is, in opposite directions on an axis running perpendicular to the axis of movement of the mast holder and parallel to the ground. The cross connector counters this force and thus holds the wheel arms together by attacking directly on the wheel arms. In contrast to the reach truck with the L-connectors explained above, the spreading is not countered by the mast holder but by the cross connector. The forces pushing the wheel arms outwards are therefore essentially absorbed only by the cross connector. The cross connector is in engagement with the wheel arms via the bearing elements in such a way that the cross connector can still be moved relative to the wheel arms. The cross connector is guided in particular on the bearing elements on the wheel arms. Since the cross connector can be moved together with the mast holder, its movement is coupled in particular with that of the mast holder Cross connectors always act at the location of the greatest forces that spread the wheel arms. For this purpose, the cross connector can be connected to the mast holder, but preferably in such a way that the forces spreading the wheel arms are not introduced into the mast holder. Advantageously, the invention thus permits reliable stabilization of the wheel arms over the entire length of the wheel arms. The reach truck can safely move a load on a mast of the mast holder over its entire reach.

According to one embodiment, the cross connector engages behind the wheel arms via the bearing elements. As already mentioned, the engagement of the cross connector according to the invention in the wheel arms can take place via such a rear grip that a movement of the wheel arms away from each other is limited outwards. At opposite longitudinal ends of the cross connector, or a connecting element of the cross connector, the bearing elements can be provided with which the cross connector engages behind the wheel arms in a clamped manner.

According to one embodiment, the cross connector is suspended on the mast holder. For example, the cross connector can be connected to the cross member and / or one or both of the side arms of the mast holder via one or more suspensions. As a result, the cross connector can be coupled with the mast holder in its movement along the wheel arms and the joint travel of the mast holder and cross connector can thus be achieved in a simple manner. However, this suspension in particular does not introduce the forces spreading the wheel arms from the cross connector into the mast holder. The suspension is in particular such that only the joint travel of the mast holder and cross connector along the wheel arms is guaranteed.

According to one embodiment, the bearing elements comprise first bearing elements arranged on the two wheel arms and on opposite end sections of the Cross bearing arranged second bearing elements, wherein one of the first bearing elements is in engagement with one of the second bearing elements. The bearing elements, via which the cross connector engages with the wheel arms for holding the wheel arms together, can be realized on each wheel arm by means of interacting first and second bearing elements. The second bearing elements of the cross connector consequently cooperate with the first bearing elements arranged on the wheel arms in such a way that a movement of the wheel arms away from one another is limited to the outside. The second bearing elements interlock with the first bearing elements, for example, so that the cross connector holds the wheel arms of the drive frame together, as explained above.

According to a preferred embodiment, the first bearing elements each have an outwardly facing tread and the second bearing elements each have at least one running element running along the respectively adjacent tread, or the second bearing elements each have an inwardly facing tread and the first bearing elements each have at least one of the respective adjacent running surface running element. According to a configuration in this regard, the running elements each have at least one running roller. Instead of the configuration with at least one roller, a slide can alternatively or additionally be provided as an embodiment of the running element. It can therefore be provided, for example, that the first bearing element of the left wheel arm comprises an outwardly facing tread, while the corresponding second bearing element arranged on the cross connector comprises at least one running element that runs along the tread of the left wheel arm. The same can then apply to the right wheel arm and the associated second bearing element of the cross connector. Pointing outwards here denotes a direction laterally away from the reach truck in the direction of the force spreading the wheel arms. According to this configuration, the interacting first and second bearing elements are thus through running surfaces formed along which at least one running element, such as, for example, a running roller or a sliding piece, runs along. The treads can always point away from the wheel arms in such a way that the tread elements grip behind the treads and thus limit the spreading of the wheel arms away from one another. As a result, the aforementioned bracket is ensured in a particularly simple manner.

According to a further embodiment, the axes of rotation of the rollers run perpendicular to a floor carrying the reach truck and parallel to the running surfaces when the reach truck is in operation. The rollers are consequently mounted on the so that their axes of rotation are arranged perpendicular to a floor carrying the reach truck and parallel to the running surfaces. Thus, the rollers can run along the forward-looking treads. In an embodiment with one or more sliders, the sliders slide along the running surfaces. The running surfaces can then be understood as sliding surfaces.

According to one embodiment, the first guide means are each arranged on the inner sides of the wheel arms and the second guide means are each arranged on the outer sides of the side arms, the respective inner side of a wheel arm facing the respective outer side of the adjacent side arm. The first guide means preferably each have a guide rail and the second guide means each have at least one guide roller, the guide rollers of the respective second guide means each being guided on the adjacent guide rail of the first guide means. The wheel arms can therefore have guide rails on their inner sides, on which the guide rollers of the respectively adjacent side arm are guided. Thus, for example, the left side arm can have one or more guide rollers on its outside facing the left wheel arm, which are guided on the opposite guide rail. The same applies to the right pair of arms. The guide rails can extend from the wheel arms in the direction of the side arms.

According to a further embodiment, the axes of rotation of the guide rollers when the reach truck is in operation run horizontally to a floor carrying the reach truck. The guide rollers can thus run along the guide rails which also extend horizontally to the floor and point away from the inner sides of the wheel arms. In particular, the axes of rotation of the guide rollers can be arranged perpendicular to the running surfaces of the bearing elements. The guide rollers can move in particular in a plane perpendicular to the rollers. The guide rollers serve to securely hold and guide the mast holder on the wheel arms, while the rollers of the bearing elements only serve to counteract the spreading of the wheel arms.

Figur 1

eine perspektivische Ansicht eines Schubmaststaplers,

Figur 2

eine perspektivische Ansicht eines Antriebsrahmens mitsamt darin gelagertem Masthalter,

Figur 3

den Antriebsrahmen aus Fig. 2 in einer schematischen Explosionsdarstellung,

Figur 4

den rechten Radarm aus Fig. 3 in einer zweiten Ansicht,

Figur 5a-c

unterschiedliche Ansichten eines Antriebsrahmens mitsamt darin gelagertem Masthalter,

Figur 6

eine Schnittansicht entlang der Linie C-C aus Fig. 5b,

Figur 7a,b

Schnittansichten entlang der Linie A-A aus Fig. 6, und

Figur 8a,b

eine alternative Aufhängung für den Querverbinder.

Embodiments of the invention are explained below with reference to figures. Show it:

Figure 1

a perspective view of a reach truck,

Figure 2

1 shows a perspective view of a drive frame together with the mast holder mounted therein,

Figure 3

the drive frame Fig. 2 in a schematic exploded view,

Figure 4

the right arm Fig. 3 in a second view,

Figure 5a-c

different views of a drive frame including the mast holder stored therein,

Figure 6

a sectional view taken along line CC Fig. 5b ,

Figure 7a, b

Sectional views along the line AA Fig. 6 , and

Figure 8a, b

an alternative suspension for the cross connector.

Unless otherwise stated, the same reference symbols denote the same objects in the following.

Figure 1 shows a schematic view of a reach truck with a drive part 100 and a load part 200. The drive part 100 includes, among other things, an electric motor, not shown, and an electric battery, not shown, for driving the reach truck. In addition, the drive part 100 comprises a drive frame 102 with a base frame 106 and two wheel arms 104, 104 'extending from this base frame and running parallel to one another. Figures 2 to 4 ). The base frame 106 is preferably a cast frame. To guide the wheel arms 104, 104 'when they are joined together with the base frame 106, projections 140 can be provided on the wheel arms 104, 104', which engage in receptacles 141 of the base frame 106 (see in particular Fig. 3 ). The wheel arms 104, 104 'each have first guide means in the form of guide rails 112, 112' and wheel housings 105, 105 'arranged at the ends of the wheel arms for receiving wheels, as in particular in FIGS Figures 2 and 3 to recognize. The load part 200 comprises a mast 300 and a mast holder 202, forks (not shown) for receiving a load, for example, can be arranged on the mast. Furthermore, the mast holder 202 comprises a cross member 206, which connects two side arms 204, 204 'running parallel to one another. The mast holder 202 has two mast attachments 209 which extend vertically upwards at the ends of the side arms 204, 204 'and are connected to one another by a cross piece 207. The mast attachments 209 serve to receive the mast 300.

Figure 5 shows different views of a drive frame 102 together with the mast holder 202 stored therein, the drive frame and mast holder being basically those of Figure 2 correspond. Figure 5a shows a front view, Figure 5b a side view and Figure 5c a sectional view taken along section line BB of the Figure 5b . Guide rollers 212a, 212a 'are arranged as second guide means on the outer sides of the side arms 204, 204' facing the wheel arms 104, 104 '. The mast holder 202 is mounted on the guide rails 112, 112 'of the wheel arms 104, 104' of the drive frame 102 via the guide rollers 212a, 212a '. The mast holder 202 is held on its guide roller 212a on the guide rail 112 of the wheel arm 104 and on its guide roller 212a 'on the guide rail 112' of the wheel arm 104 '. The mast holder 202 is movably mounted on the drive frame 102 via the guide means.

Fig. 6 shows a section through drive frame 102 and mast holder 202 along in FIG Fig. 5b cutting line marked with CC. Between the wheel arms 104, 104 ', a cross connector 300 extends below the mast holder 202 from one wheel arm 104 to the other wheel arm 104'. The cross connector 300 comprises an elongated connecting element 302, which can be a sheet metal part, for example, and rollers 304, 304 ′ arranged on opposite longitudinal ends of the connecting element 302. By means of the rollers 304, 304 ', the cross connector 300 engages behind the respective wheel arms 104, 104' in a clamped manner. The roller 304 is in contact with an outward tread 122 facing away from the mast holder 202 and the roller 304 'with an outward facing tread 122' facing away from the mast holder 202, as in particular in the sectional views of FIG Figures 5c and 6 evident.

If the cross connector 300 is moved along the wheel arms 104, 104 ', the rollers 304, 304' run on their respective running surfaces 122, 122 '. The running surfaces 122, 122 'form first bearing elements arranged on the wheel arms 104, 104' and the running rollers 304, 304 'form on the cross connector 300 arranged second bearing elements. Via these bearing elements, the cross connector 300 engages with the wheel arms 104, 104 'in such a way that the cross connector 300 limits movement of the wheel arms 104, 104' away from one another. This is achieved by the clamped engagement of the wheel arms 104, 104 'by the respective rollers 304, 304' of the cross connector 300.

If a load is now loaded on the mast holder 202, the weight of the load is transmitted via the side arms 204, 204 'of the load part 200 and their guide means to the wheel arms 104, 104'. This leads to forces that move the wheel arms 104, 104 'outwards, away from one another and thus spread them apart. Especially when the mast holder is extended, this effect can be quite large and endanger the stability and safety of the transported load. The cross connector 300 counteracts this spreading of the wheel arms 104, 104 '. The cross connector holds the wheel arms together against the spreading forces by attack directly on the wheel arms, so it absorbs these forces. The cross connector 300 engages with the wheel arms 104, 104 'in each case via the bearing elements 304, 304', 122, 122 'in such a way that the cross connector 300 can still be moved relative to the wheel arms 104, 104'.

The cross connector 300 is coupled in motion to the mast holder 202 and is thus moved together with the mast holder 202 with respect to the wheel arms 104, 104 ′. If the mast holder 202 is retracted or extended with respect to the drive frame 102, the cross connector 300 moves accordingly. The cross connector can therefore always act where the forces spreading the wheel arms are greatest.

In Figure 6 as in Figures 7a and 7b A first embodiment of a suspension is shown with which the coupling between cross connector 300 and mast holder 202 can be achieved. Figure 7a shows a sectional view along the section line AA off Figure 6 . Figure 7b shows a detail labeled E of FIG Figure 7a . It can be seen that the cross connector is suspended on each of the side arms 204, 204 'in each case via a hanger 306, 306' which extends parallel to the side arms into the mast holder. The hangers 306, 306 'are each fastened to their respective side arms 204, 204' by means of screws or bolts 308 ', only one bolt 308' being visible in the figures.

In the Figures 8a, b an alternative embodiment of a suspension for the cross connector is shown. As can be seen there, the cross connector 300 can also be suspended on an underbody 203 of the mast holder 202. For this purpose, hangers 310 'are connected to the underbody 203, for example by means of bolts or screws, in particular in the area of both side arms 204, 204', in Figure 8 only one of the hangers is recognizable.

The invention advantageously permits reliable stabilization of the wheel arms over the entire length of the wheel arms. The reach truck can safely move a load on a mast of the mast holder over its entire reach.

Reference list

10th

Reach truck

100

Drive part

102

Drive frame

104, 104 '

Wheel arms

105, 105 '

Wheel arches

106

Base frame

108, 108 '

Inside of the wheel arms

112, 112 '

Guide rails

122, 122 '

Treads

200

Load part

202

Mast holder

203

Underbody

204, 204 '

Side arms

206

Cross member

207

Cross piece

208, 208 '

Outside of the side arms

209

Mast attachments

212a, 212a '

Leadership roles

300

Cross connector

302

Fastener

304, 304 '

Casters

306, 306 '

hanger

308, 308 '

Screws / bolts

310 '

hanger

300

Mast

B

ground

Claims (10)

Reach truck with a drive part (100) and a load part (200), wherein - The drive part (100) comprises a drive frame (102) with two wheel arms (104, 104 ') running parallel to one another and a base frame (106) connecting the wheel arms (104, 104') to each other, with the wheel arms (104, 104 ' ) a first guide means (110, 110 ') is arranged, - The load part (200) comprises a mast holder (202) with two side arms (204, 204 ') running parallel to one another and a cross member (206) connecting the side arms (204, 204') to each other, with the side arms (204, 204 ' ) a second guide means (210, 210 ') is arranged, - The side arms (204, 204 ') of the mast holder (202) extend parallel to the wheel arms (104, 104') of the drive frame (102), so that one of the side arms (204, 204 ') is adjacent to one of the wheel arms ( 104, 104 '), - Each of the first guide means (112, 112 ') of a wheel arm (104, 104') interacts with the second guide means (212a, 212a ') of the adjacent side arm (204, 204') in such a way that the mast holder (202) can be moved to the Radarmen (104, 104 ') is guided, characterized in that - A cross connector (300) connecting the two wheel arms (104, 104 ') extends from one wheel arm to the other wheel arm and is guided together with the mast holder (202) so that it can be moved on the wheel arms (104, 104'), the cross connector (300) engages with the wheel arms (104, 104 ') via bearing elements (122, 122', 304, 304 ') in such a way that the cross connector (300) moves the wheel arms (104, 104') away from one another limited. Reach truck according to Claim 1, characterized in that the cross connector (300) engages behind the wheel arms (104, 104 ') in each case in a clamped manner via the bearing elements (122, 122', 304, 304 '). Reach truck according to claim 1 or 2, characterized in that the cross connector (300) is suspended from the mast holder (202). Reach truck according to one of the preceding claims, characterized in that the bearing elements on the two wheel arms (104, 104 ') arranged first bearing elements (122, 122') and on opposite end sections of the cross connector arranged second bearing elements (304, 304 '), wherein one of the first bearing elements (120, 120 ') is in engagement with one of the second bearing elements (304, 304'). Reach truck according to claim 4, characterized in that the first bearing elements each have an outwardly facing running surface (122, 122 ') and the second bearing elements each have at least one running element (304, 304') running along the respectively adjacent running surface (122, 122 ') or that the second bearing elements each have an inwardly facing tread and the first bearing elements each have at least one running element running along the respectively adjacent tread. Reach truck according to claim 5, characterized in that the running elements each have at least one roller (304, 304 ') and / or at least one slider. Reach truck according to claim 6, characterized in that the running elements have a plurality of rollers and the axes of rotation of the rollers (304, 304 ') perpendicular to one in the operation of the reach truck the floor of the reach truck and parallel to the treads (122, 122 '). Reach truck according to one of the preceding claims, characterized in that the first guide means (112, 112 ') each on the inside of the wheel arms (104, 104') and the second guide means (212a, 212a ') each on the outside of the side arms (204 , 204 ') are arranged, the respective inner side of a wheel arm (104, 104') facing the respective outer side of the adjacent side arm (204, 204 '). Reach truck according to claim 8, characterized in that the first guide means each have a guide rail (112, 112 ') and the second guide means each have at least one guide roller (212a, 212a'), the guide rollers (212a, 212a ') of the respective second guide means are each guided on the adjacent guide rail (112, 112 ') of the first guide means (110, 110'). Reach truck according to claim 10, characterized in that the axes of rotation of the guide rollers (212a, 212a ') run horizontally to a floor carrying the reach truck during operation of the reach truck.

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