Shaving hub wagon

Abstract

The present invention provides a scissor lift truck (1) comprising a chassis (2) with a handle (6), a fork assembly (3), and a drive unit (5) with a lifting device (4) arranged close to the handle on the chassis (2) and connected to the fork assembly (3). The drive unit (5) has an electric drive coupled to the lifting device (4), which comprises an electric lifting cylinder (40), a lifting rod (41), and a pull handle (42) connected centrally to the lifting rod (41). The fork device (3) has two parallel fork tines (30a, 30b) connected to the drawbar (42), a retaining bracket (31) connecting the two fork tines (30a, 30b), and four scissor arm assemblies, each consisting of an outer scissor arm (32a, 32b) and an inner scissor arm (33a, 33b) connected by a joint (34a), with each fork tine (30a, 30b) being assigned two of the scissor arm assemblies.The chassis (2) has two parallel support rails (20a, 20b) with wheels (7) at an end near the handle and an end farther from the handle, each support rail (20a, 20b) having two parallel guide slots (21a, 21b) and each of the guide slots (21a, 21b) being assigned to one of the scissor arm assemblies. A first end of the outer scissor arms (32a, 32b) is arranged near the handle on an underside of the assigned fork tine (30a, 30b) and is pivotally connected to the assigned fork tine (30a, 30b) in a fixed position. A second end of the outer scissor arms (32a, 32b) is slidably guided in one of the guide slots (21a, 21b) of the assigned support rail (20a, 20b) farther from the handle.A first end of the inner scissor arms (33a, 33b) is arranged close to the handle in one of the guide lanes (21a, 21b) of the associated support rail (20a, 20b) and is connected to the chassis (2) by a fixed pivot, and a second end of the inner scissor arms (33a, 33b) is arranged to be displaceable on the underside of the associated fork tine (30a, 30b) away from the handle.

Description

[0001] The invention relates to a scissor lift truck.

[0002] Electro-hydraulic pallet trucks are known from the prior art for transporting loads. Such pallet trucks can be operated manually and maneuvered using a steerable tiller. As known from DE 36 42 700 A1, a scissor mechanism can be provided to raise the forks of the truck, thereby raising the forks and the loads placed on them to an ergonomically favorable working height. A vertical hydraulic cylinder piston, supported on a single-axle chassis, is provided for lifting and lowering. A pair of scissor arms is fixed to the chassis on one side and slidably hinged to a fork at the top. A second pair of scissor arms is associated with this pair, the arms of which are fixedly hinged to a fork at the rear on one side and have rollers attached to the bottom of each arm. The scissor arms have rollers or...Support feet that hold the scissor arms in an extended position.

[0003] Based on this state of the art, the object of the present invention is to provide an improved scissor lift truck that is easy and safe to operate.

[0004] This problem is solved by a scissor lift truck with the features of claim 1.

[0005] Further developments or preferred embodiments of the scissor lift truck are described in the dependent claims.

[0006] A first embodiment of the scissor lift truck according to the invention comprises a chassis with a handle, a fork assembly, and a drive unit with a lifting device, which is arranged close to the handle on the chassis and connected to the fork assembly. The drive unit has an electric drive coupled to the lifting device, which includes an electric lifting cylinder, a lifting rod, and a pull handle connected centrally to the lifting rod.

[0007] The fork assembly has two parallel fork tines connected to the ends of the drawbar. Furthermore, the fork assembly has a retaining bracket connecting the two fork tines and four scissor arm assemblies, each consisting of an outer and an inner scissor arm connected by a joint. Each fork tine is assigned two of these scissor arm assemblies.

[0008] The chassis comprises two parallel support rails, corresponding to the fork tines, with wheels at one end near the handle and one farther away. Each support rail has two parallel guide slots, each of which is assigned to one of the scissor arm assemblies. A first end of the outer scissor arms is located near the handle on the underside of the assigned fork tine and is fixedly pivoted to it. A second end of the outer scissor arms is slidably guided in one of the guide slots of the assigned support rail, farther away from the handle.

[0009] Furthermore, a first end of the inner scissor arms is arranged close to the handle in one of the guide lanes of the associated support rail and is fixedly articulated to the chassis, while a second end of the inner scissor arms is arranged to be displaceable on an underside of the associated fork tine farther from the handle.

[0010] The scissor lift pallet truck according to the invention makes it possible to raise the forks, and thus all types of loads that can be transported with a pallet truck, to an ergonomic working height. The electric lifting mechanism allows for stepless height adjustment, which saves time and makes the operator's job easier, especially when working at frequently changing heights, such as when restocking shelves in a supermarket or warehouse. The double scissor arm arrangements for each fork provide high stability and a high load-bearing capacity. Even heavy loads can thus be lifted to comfortable working heights. The scissor lift pallet truck according to the invention can still be used like a conventional pallet truck to transport loads from one place to another, and in combination with the scissor arm arrangements, it offers the functionality of the invention.

[0011] The terms “close to the handle” and “far from the handle” describe a position in relation to the handling of the scissor lift truck, which is located on one side of the chassis or the fork device.

[0012] The differentiation between the scissor arms of a scissor arm assembly, known as "outer" and "inner," refers to their arrangement relative to a central longitudinal axis of the scissor lift truck, which runs parallel to and centered between the forks or support rails. This means that the outer scissor arms of the assemblies for the "left" fork and the outer scissor arms of the assemblies for the "right" fork are located on opposite sides, for example, when distinguishing the forks by "left" and "right" based on the handle.

[0013] The “underside” of the fork tine, to which the scissor arms are articulated at one end or arranged to be slidable, is the side of the fork tine that faces away from the holding bracket or towards the associated support rail.

[0014] According to a further embodiment of the scissor lift truck, the movable ends of the scissor arms are guided in the guide tracks of the support rails by means of rollers or rolling elements. The rolling or roller bearing can then be movably mounted in a rail guide of the support rail, specifically in a rail extending longitudinally along the support rail, via guide elements. This provides positive guidance, ensuring that each movable end of the scissor arms is guided linearly in its respective guide track. This also applies to the other movable ends of the scissor arms. The underside of the fork tines can be designed with corresponding guide tracks, similar to the support rails, to be guided in a manner corresponding to the lower ends of the scissor arms.A forced guidance system in combination with a roller or rolling bearing enables low-friction, linear movement while simultaneously defining a stable position at a set height.

[0015] The height adjustment, i.e., the raising and lowering of the forks, is advantageously performed purely electrically via the handle, which is used as a tiller to move and maneuver the scissor lift truck. Therefore, according to a further embodiment of the scissor lift truck according to the invention, the handle has a grip and a control panel that is connected to the electric drive of the drive unit for actuating the lifting mechanism. The control panel or the grip may have additional control fields or buttons that can be provided for further functions of the scissor lift truck, such as a vertical height adjustment of the support rails, which results in raising the entire lift truck by a few centimeters in order to compensate for or drive over obstacles or uneven ground.

[0016] In yet another embodiment of the scissor lift truck according to the invention, the electric drive is a linear drive. Preferably, a space-saving and low-maintenance spindle drive can be used. The height adjustment can thus be set with millimeter precision, i.e., steplessly. The forks can be lowered to a ground clearance of 90 mm and raised within a range of 600 mm to 800 mm. For example, a wheel lift reaches a height within a range of 90 mm to 110 mm, preferably 105 mm, and the spindle drive (fork lift) reaches a height within a range of 630 mm to 700 mm, preferably 650 mm, so that in a preferred embodiment, the forks can be raised to a total height of 755 mm from the ground. The achievable height of the fork lift is determined by the linear drive and internal current limiting.

[0017] According to yet another embodiment of the scissor lift truck according to the invention, each support rail is pivotally connected at the end near the handle to a wheel housing in which one of the wheels is mounted. A pivot axis runs orthogonally to the transport plane. The "transport plane" refers to a plane of the chassis defined by the fork tines and parallel to the surface on which the scissor lift truck is moved. These wheels serve as lateral support for the drive unit housing and thus increase the stability of the scissor lift truck.

[0018] According to yet another embodiment of the scissor lift truck according to the invention, each support rail has a push rod that separates the two guide lanes of each support rail. This push rod is connected by a joint at the end of the support rail furthest from the handle to a wheel fork, which is pivotally connected to the support rail and in which at least one of the wheels is mounted. The pivot axis of the joint runs parallel to the transport plane and orthogonal to the push rod. Thus, the wheel forks can pivot between a raised position, in which the scissor lift truck can be moved, and a lowered position, in which the support rails rest on the floor, ensuring the lift truck's stability. The push rod is connected within the drive unit housing to a hydraulic or electric drive, which includes a lever and can be controlled via the handle.This lever is directly connected to the push rod. When the lever, activated by the drive, moves downwards, the drive unit housing is pushed upwards, and the lever acts on the push rod, pushing it forwards, i.e., away from the handle. The wheel fork is pushed downwards and folds at the joint, so that the wheels are positioned under the support rails, pushing the rails upwards. The scissor lift truck can thus be maneuvered even with the forks raised and a load on them. For heavy loads, the push rod can alternatively be designed as a tension rod to prevent twisting of a pushing rod and to achieve better power transmission and thus height adjustment of the support rails. Each wheel fork can accommodate one or more wheels, preferably two wheels arranged one behind the other as tandem wheels in the wheel fork.

[0019] Therefore, in yet another embodiment of the scissor lift truck according to the invention, the wheel fork can be articulated to two struts between which two wheels are mounted one behind the other. These hold the wheels mounted one behind the other in position and stabilize the truck.

[0020] Further embodiments of the scissor lift truck, as well as some of the advantages associated with these and other embodiments, will be clarified and made more easily understandable by the following detailed description with reference to the accompanying figures. Items or parts thereof that are essentially the same or similar may be provided with the same reference numerals. The figures are merely a schematic representation of one embodiment of the invention.

[0021] This shows Fig. 1 a perspective view of a scissor lift truck according to the invention with raised fork tines, Fig. 2 a perspective detail view of the scissor arm arrangements of the scissor lift truck according to the invention Fig. 1, Fig. 3 a perspective detail view of the wheel fork in the lowered position of the chassis, and Fig. 4 A schematic detail view of a movable end of the outer scissor arms.

[0022] As in Fig. As shown in Figure 1, the scissor lift truck 1 has a chassis 2 to which a handle 6 is articulated, as well as a fork assembly 3 and a drive unit 5 with a lifting device 4. The drive unit 5 is located adjacent to the handle 6 on the chassis 2 and houses an electric drive (not shown) which is coupled to the lifting device 4. The lifting device 4 is connected to the fork assembly 3, which is located on the side of the drive unit 5 facing away from the handle 6. The lifting device 4 has an electric lifting cylinder 40 for driving a lifting rod 41, which is electrically movable vertically, i.e., orthogonally to the transport plane, by means of the lifting cylinder 40. The electric drive of the drive unit 5 can be easily and conveniently operated to control the lifting device 4 by means of a control panel 61 near the handle 6.

[0023] For connection to the fork assembly 3, the lifting device 4 further comprises a drawbar 42, which is designed in an inverted U or Π shape with a transverse strut and two connecting struts. The lifting rod 41 is connected centrally to the transverse strut of the drawbar 42 and is thus located centrally between the two connecting struts of the drawbar 42. The fork assembly 3 consists of two parallel forks 30a, 30b, which are connected close to the handle on one side to the drawbar 42 and on the other side by a retaining bracket 31, which serves as a stop for the transported goods. The forks 30a, 30b are attached directly to the ends of the connecting struts of the drawbar 42, which is separated from and protected by the retaining bracket 31 from the transported goods.

[0024] The fork device 3 is supported on the chassis 2 by means of four scissor arm assemblies, which for this purpose has two parallel support rails 20a, 20b corresponding to the fork tines 30a, 30b, in which two parallel guide grooves 21a, 21b are formed for receiving the scissor assemblies. Each scissor arm assembly consists of an outer scissor arm 32a, 32b and an inner scissor arm 33a, 33b, which are connected by a joint 34a, as shown in Fig. 2 is more clearly visible.

[0025] For ease of understanding, a distinction is made below between right and left with regard to the fork tines 30a, 30b, the support rails 20a, 20b, and the scissor arm assemblies. Starting from the handle 6, the scissor lift truck 1 has a right support tine 30a and a left support tine 30b, as well as a corresponding right support rail 20a and a left support rail 20b. The right support tine 30a is supported by two right scissor arm assemblies in the guide grooves 21a of the right support rail 20a; the left support tine 30b is supported by two left scissor arm assemblies in the guide grooves 21b of the left support rail 20b.

[0026] With regard to the two right-hand scissor arm assemblies, the first end of the outer scissor arms 32a is located close to the handle on the underside of the right fork tine 30a and is pivotally connected to it in a fixed position. The second end of these two outer scissor arms 32a is located further away from the handle in a guide groove 21a of the right support rail 20a and is mounted there in a guided, slidable manner. The inner scissor arms 33a are each located at one end in a guide groove 21a of the right support rail 20a, close to the handle, and are pivotally connected to the right support rail 20a of the chassis 2 in a fixed position, while the other end of the inner scissor arms 33a is located further away from the handle on the underside of the right fork tine 30a and is slidable in the longitudinal direction of the right fork tine 30a.

[0027] The same applies to the two left-hand scissor arm assemblies: The first end of the outer scissor arms 32b is located close to the handle on the underside of the left fork tine 30b and is pivotally connected to it in a fixed position. The second end of these two outer scissor arms 32b is located further away from the handle in a guide groove 21b of the left support rail 20b and is mounted there in a guided, slidable manner. The inner scissor arms 33b are each located at one end in a guide groove 21b of the left support rail 20b close to the handle and are pivotally connected to the left support rail 20b of the chassis 2 in a fixed position, while the other end of the inner scissor arms 33b is located further away from the handle on the underside of the left fork tine 30b and is slidable in the longitudinal direction of the left fork tine 30b. The movable ends of the outer scissor arms 32a, 32b are mounted on roller bearings in the guide grooves 21a, 21b. Fig. Figure 4 shows one possible rolling bearing arrangement. A roller, acting as a rolling element 37, is arranged at the end of the outer scissor arm 32a. This roller can roll in the guide groove 21a, allowing the end of the outer scissor arm 32a furthest from the handle to be slidably mounted in the guide groove 21a. The rolling element 37 is guided movably in a lateral rail guide 35 of the support rail 20a and in a guide opening 35a (which can be designed as an elongated hole) extending longitudinally along the support rail 20a by means of axle and guide elements 36. When the scissor arm 32a is moved, its end is guided linearly in the guide groove 21a by this type of positive guidance. This also applies to the other movable ends of the scissor arms. The underside of the fork tines 30a, 30b is designed with corresponding guide grooves, similar to the support rails 20a, 20b.

[0028] For maneuverability, the scissor lift truck has wheels or rollers 7 at an end near the handle and an end far from the handle on the support rails 20a, 20b. At the end near the handle, the chassis 2 has a wheel / roller 7 on each side, housed in a wheel housing 25a (in Fig. In Figure 1, only the right wheel housing (25a) is visible, which is articulated to the respective support rails (20a, 20b) so that the scissor lift truck (1) can be steered. The articulation axis therefore runs perpendicular to the transport plane.

[0029] For the arrangement of wheels / rollers 7 at the end of the support rails 20a, 20b furthest from the handle, a thrust strut 26a, 26b extends from the drive unit 5 through the support rails 20a, 20b, the thrust strut 26a, 26b separating the guide lanes 21a, 21b of each support rail 20a, 20b from one another. At the end of the support rails 20a, 20b furthest from the handle, the thrust strut 26a, 26b is connected by a joint 23a (only the right joint is shown in the figure) to a wheel fork 22a, 22b, which is also pivotally connected at the end furthest from the handle to the support rail 20a, 20b, the pivot axis of the joint 23a being parallel to the transport plane and orthogonal to the thrust strut 26a, 26b. In this way, the wheel forks 22a, 22b can be pivoted by actuating the push rods 26a, 26b in order to raise the chassis 2 from a raised position ( Fig. 1) into a lowered position ( Fig. 3) and vice versa.

[0030] In principle, it is possible that a wheel or roller is directly mounted in the wheel fork 22a, 22b, but in the present example, the wheel fork 22a, 22b serves as a movable mounting for a pair of struts 24a,b, between which two wheels or rollers 7 are mounted one behind the other, so that more stable transport is achieved when driving over uneven surfaces. REFERENCE MARK LIST 1 scissor lift truck 2 chassis 20a / b mounting rail 21a / b Guide Lane 22a / b Wheel fork 23a joint 24a strut 25a Wheel housing 26a, 26b thrust strut 3 Fork device 30a / b Fork tines 31 Mounting bracket 32a / b Outer scissor arm 33a / b Inner scissor arm 34a joint 35 Rail guide support rail 35a Side guide opening 36 Axle / Guide Element 37 rolling elements 4 Lifting device 40 Electric lifting cylinders 41 Lifting rod 42 stirrups 5 Drive unit 6. Handle 60 handle 61 Control panel 7 Wheel / Roller QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 36 42 700 A1

[0002]

Claims

[1] Scissor lift truck (1) comprising a chassis (2) with a handle (6), a fork device (3) and a drive unit (5) with a lifting device (4) which is arranged close to the handle on the chassis (2) and is connected to the fork device (3), wherein - the drive unit (5) has an electric drive which is coupled to the lifting device (4), which has an electric lifting cylinder (40), a lifting rod (41) and a tension bracket (42) which is centrally connected to the lifting rod (41), and - the fork device (3) has two parallel fork tines (30a, 30b) connected to the drawbar (42), a holding bracket (31) connecting the two fork tines (30a, 30b), and four scissor arm assemblies each comprising an outer scissor arm (32a, 32b) and an inner scissor arm (33a, 33b), each connected by a joint (34a), each fork tine (30a, 30b) being assigned two of the scissor arm assemblies, and - the chassis (2) has two parallel support rails (20a, 20b) with wheels (7) at one end near the handle and one end far from the handle, wherein each support rail (20a, 20b) has two parallel guide lanes (21a, 21b) and each of the guide lanes (21a, 21b) is assigned to one of the scissor arm arrangements, and wherein - a first end of the outer scissor arms (32a, 32b) is arranged close to the handle on an underside of the associated fork tine (30a, 30b) and is fixedly connected in an articulated manner to the associated fork tine (30a, 30b), and - a second end of the outer scissor arms (32a, 32b) is arranged in one of the guide channels (21a, 21b) of the associated support rail (20a, 20b) so as to be displaceable and guided away from the handle, and - a first end of the inner scissor arms (33a, 33b) is arranged close to the handle in one of the guide channels (21a, 21b) of the associated support rail (20a, 20b) and is fixedly connected to the chassis (2) in an articulated manner, and - a second end of the inner scissor arms (33a, 33b) is arranged displaceably on the underside of the associated fork tine (30a, 30b) away from the handle. [2] Scissor lift truck (1) according to claim 1, characterized bythat the handle (6) has a grip (60) and a control panel (61) which is connected to the electric drive of the drive unit (5) for actuating the lifting device (4). [3] Scissor lift truck (1) according to claim 1 or 2, characterized by that the electric drive is a linear drive, preferably a spindle drive. [4] Scissor lift truck (1) according to at least one of claims 1 to 3, characterized by that each support rail (20a, 20b) is connected in an articulated manner at the end near the handle to a wheel housing (25a) in which one of the wheels (7) is mounted, wherein a joint axis runs orthogonally to the transport plane. [5] Scissor lift truck (1) according to at least one of claims 1 to 4, characterized byin that the guide channels (21a, 21b) of each support rail (20a, 20b) are separated from one another by a push rod (26a, 26b) which, at the end of the support rail (20a, 20b) remote from the handle, is connected by a joint (23a) to a wheel fork (22a, 22b) which is connected in an articulated manner to the support rail (20a, 20b) and in which at least one of the wheels (7) is mounted, wherein a joint axis of the joint (23a) runs parallel to the transport plane and orthogonal to the push rod (26a, 26b), wherein the wheel fork (22a, 22b) is pivotable between a raised position and a lowered position for transferring the chassis (2). [6] Scissor lift truck (1) according to claim 5, characterized by that the wheel fork (22a, 22b) is articulated to two struts (24a,b), between which two wheels (7) are mounted one behind the other.

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