Industrial truck

Patent metadata

Field	Value
Publication number	US-10046812-B2
Application number	US-201615002536-A
Country	US
Kind code	B2
Filing date	Jan 21, 2016
Priority date	Jan 22, 2015
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

An industrial truck is proposed comprising:
a lifting frame; an operator compartment which can be moved upwards and downwards; a lateral push frame, arranged on the operator compartment, in the front thereof, and which can be moved upwards and downwards together with the operator compartment and carries a load-receiving device, which can be moved back and forth; and a vibration-damping means, which can be moved upwards and downwards, for damping vibrations. The vibration-damping means being arranged between the operator compartment and the load-receiving device, is designed to make vibration compensation movements of the load-receiving device relative to the operator compartment possible. Preferably, an over-reach device is provided, combined with the vibration-damping means, for moving the lateral push frame to the straight forward travel direction of the industrial truck and relative to the operator compartment, so as to increase the lateral movement range of the load-receiving device relative to the operator compartment.

First claim

The invention claimed is:

1. An industrial truck comprising:
a lifting frame,
an operator compartment which can be moved upwards and downwards on the lifting frame,
a lateral push frame, which is arranged on and in front of the operator compartment, and which can be moved upwards and downwards on the lifting frame together with the operator compartment and carries a load-receiving device, which can be moved back and forth laterally transversely to a straight forward travel direction of the industrial truck, and
a vibration-damping means, which can be moved upwards and downwards on the lifting frame together with the operator compartment, for damping vibrations,
wherein the vibration-damping means is arranged between the operator compartment and the load-receiving device and is designed to make vibration compensation movements of the load-receiving device relative to the operator compartment possible so as to damp or suppress vibrations.

2. The industrial truck according to claim 1 , wherein the vibration-damping means is arranged between the operator compartment and the lateral push frame, and is designed to make shared vibration compensation movements of the load-receiving device and the lateral push frame relative to the operator compartment possible so as to damp or suppress vibrations.

3. The industrial truck according to claim 2 , further comprising a lateral push frame guide, on which the lateral push frame is movably guided so as to perform vibration compensation movements laterally transversely in the straight forward travel direction of the industrial truck and relative to the operator compartment, wherein the lateral push frame guide is provided on the operator compartment.

4. The industrial truck according to claim 1 , wherein the vibration-damping means comprises at least one resilient return element in a connection between the load-receiving device and the operator compartment.

5. The industrial truck according to claim 1 , wherein the vibration-damping means further comprises at least one hydraulic, pneumatic or hydropneumatic shock absorber element in a connection between the load-receiving device and the operator compartment.

6. The industrial truck according to claim 5 , wherein the shock absorber element is a cylinder, which comprises, in a cylinder housing, two cylinder chambers which are separated by a piston movable in the cylinder housing and which contain a fluid and are interconnected via a throttle point.

7. The industrial truck according to claim 1 , wherein the vibration-damping means comprises at least one active hydraulic, pneumatic, hydropneumatic or electromotive vibration-damping member which can be controlled by a control means.

8. The industrial truck according to claim 1 , further comprising an over-reach device for controlled lateral positioning of the lateral push frame transversely in the straight forward travel direction of the industrial truck and relative to the operator compartment, the over-reach device comprising a lateral push frame guide and a controllable adjustment device for moving the lateral push frame along the lateral push frame guide, the vibration-damping means being integrated into the over-reach device.

9. The industrial truck according to claim 8 wherein the controllable adjustment device comprises at least one adjustment member which can be controlled by a control means, wherein the control means is a hydraulic adjustment member, an electromotive adjustment member, or a hydropneumatic adjustment member, as drive means for moving the lateral push frame, the adjustment member being operable as a vibration-damping member in a vibration-damping mode of the over-reach device.

10. The industrial truck according to claim 9 , wherein the controllable adjustment member is a double-action hydraulic synchronized cylinder between the operator compartment and the lateral push frame, the double-action hydraulic synchronized cylinder comprising, in a cylinder housing and two cylinder chambers separated by a piston movable in the cylinder housing and having at least one hydraulic connection for supplying and removing hydraulic fluid, the adjustment member being operable as an active and/or passive vibration-damping member.

11. The industrial truck according to claim 10 , wherein the double-action hydraulic synchronized cylinder can be actuated in such a way that the cylinder chambers are interconnected via at least one hydraulic throttle point so as to set a passive vibration-damping mode.

12. The industrial truck according to claim 8 , wherein at least one resilient return element is arranged in a connection between the lateral push frame and an adjusting means or in a connection between the adjusting means and the operator compartment in such a way that the resilient return element can counter vibratory deflections of the lateral push frame relative to the operator compartment.

13. The industrial truck according to claim 8 , wherein at least one sensor is provided for detecting vibrations of the lateral push frame or the load-receiving device, wherein the at least one sensor can exchange data with a control means of a adjustment member of the over-reach device, and wherein the control means, in an active vibration-damping mode of the over-reach device, can control the adjustment member of the over-reach device based on measurement information from the at least one sensor in such a way that the adjustment member performs adjustment movements which counter any vibrations of the lateral push frame and/or the load-receiving device.

14. The industrial truck according to claim 13 , wherein the at least one sensor is selected from the group consisting of the following sensors:
a strain gauge;
a piezoelectric element;
a fluid pressure sensor;
an acceleration sensor; and
a distance sensor.

15. The industrial truck according to claim 14 , wherein the at least one sensor is arranged and designed so as to detect changes in position of the lateral push frame relative to the lateral push frame guide or to the operator compartment.

16. The industrial truck according to claim 8 , wherein a plurality of sensors are in data transfer connection with a control means of an adjustment member of the over-reach device, wherein the control means is operable, in an active vibration-damping mode of the over-reach device, to control the adjustment member of the over-reach device as a function of measurement information from at least some of the sensors in such a way that the adjustment member performs adjusting movements which counter any vibrations of the lateral push frame, and wherein the sensors being designed to provide information concerning resilient material strains of the lifting frame, vibrations of the load-receiving device relative to the lateral push frame, a current travel speed of the industrial truck, a lifting height of the operator compartment, a lifting height of the load-receiving device relative to the operator compartment, or a mass of a load carried by the load-receiving device.

17. The industrial truck according to claim 5 , wherein the shock absorber element is connected between the lateral push frame and the operator compartment.

18. The industrial truck according to claim 1 , wherein the vibration-damping means comprises at least one resilient return element in a connection between the lateral push frame and the operator compartment and is arranged in such a way that it counters vibratory deflections of the load-receiving device or of the lateral push frame relative to the operator compartment.

19.

Assignees

• Jungheinrich Ag

Inventors

• Schmalzl Jürgen
• Schöttke Carsten

Classifications

• B66F9/148

  Whole unit including fork support moves sideways · CPC title

• B66F9/0759

  Details of operating station, e.g. seats, levers, operator platforms, cabin suspension · CPC title

• B66F9/07559 Primary

  Stabilizing means · CPC title

• B62D33/0636

  displaceable along a linear path · CPC title

• B62D33/073 Primary

  characterised by special adaptations of vehicle control devices · CPC title