Measurement standard for sensing lifting heights

• US 7,266,904 B2
• Filed: 06/28/2005
• Issued: 09/11/2007
• Est. Priority Date: 07/08/2004
• Status: Active Grant

• Current Assignee: Jungheinrich AG
• Original Assignee: Jungheinrich AG
• Inventors: Hammerl, Robert, Schottke, Carsten, Schroder, Klaus
• Primary Examiner(s): GUADALUPE, YARITZA
• Application Number:
  US11/169,210
• Publication Number:
  US 20060005415A1
• Time in Patent Office: 805 Days
• Field of Search: 337/06, 337/55, 187/222, 177/229
• US Class Current: 33/706
• CPC Class Codes: B66F 9/0755 Position control; Position detectors

Abstract

The invention relates to an industrial truck having a first load-bearing component (12) and a second load-bearing component (14) which are provided such that they can move in relation to one another for the purpose of carrying out a conveying movement, a sensor scale (22) being provided on one of the load-bearing components (14) (scale load-bearing component) for the purpose of detecting the relative movement between the two load-bearing components (12, 14), and a sensor (24), which is designed to detect the sensor scale (22), being provided on the respective other load-bearing component (12) (sensor load-bearing component). The industrial truck is characterized in that the sensor scale (22) is designed integrally on the scale load-bearing component (14) such that a section (14a) of the scale load-bearing component (14) itself is the sensor scale (22).

Claims

1. An industrial truck having a scale load-bearing component and a sensor load-bearing component which are provided such that they can move in relation to one another for the purpose of carrying out a conveying movement, a sensor scale being provided on the scale load-bearing component for the purpose of detecting relative movement between the two load-bearing components, and a sensor, which is designed to detect the sensor scale, being provided on the sensor load-bearing component, wherein the sensor scale is designed integrally on the scale load-bearing component such that a section of the scale load-bearing component itself is the sensor scale.

2. An industrial truck according to claim 1, wherein the sensor scale is formed as a kind of relief in the scale load-bearing component.

3. An industrial truck according to claim 2, wherein the sensor scale is cast and/or impressed and/or embossed and/or milled and/or etched into the scale load-bearing component.

4. An industrial truck according to claim 1, wherein the sensor is accommodated in a sliding block, the sliding block being fixed on the sensor load-bearing component such that it can move in a direction (W) towards and away from the scale load-bearing component and sliding on a sliding surface of the scale load-bearing component, which sliding surface is different from the sensor scale, in the event of a relative movement of the scale load-bearing component and the sensor load-bearing component.

5. An industrial truck according to claim 4, wherein the sliding surface has a plurality of parts, the sensor scale extending between two sections of the sliding surface.

6. An industrial truck according to claim 4, wherein the sliding block is prestressed so as to bear against the sliding surface.

7. An industrial truck according to claim 1, wherein a load-bearing component is a stand of a mast or of an additional lift, and in that the respective other load-bearing component is a lifting frame of the mast or a side frame or a fork carrier of the additional lift.

8. An industrial truck according to claim 7, wherein the stand is the sensor load-bearing component, and the lifting frame or fork carrier or side frame is the scale load-bearing component.

9. An industrial truck having a scale load-bearing component and a sensor load-bearing component which are provided such that they can move in relation to one another for the purpose of carrying out a conveying movement, a sensor scale being provided on one of the load-bearing components for the purpose of detecting relative movement between the two load-bearing components, and a sensor, which is designed to detect the sensor scale, being provided on the respective other load-bearing component, wherein the sensor scale is designed integrally on the scale load-bearing component such that a section of the scale load-bearing component itself is the sensor scale, and wherein the sensor is accommodated in a sliding block, the sliding block being fixed on the sensor load-bearing component such that it can move in a direction (W) towards and away from the scale load-bearing component and sliding on a sliding surface of the scale load-bearing component, which sliding surface is different from the sensor scale, in the event of a relative movement of the scale load-bearing component and the sensor load-bearing component.

10. An industrial truck according to claim 9, wherein the sliding surface has a plurality of parts, the sensor scale extending between two sections of the sliding surface.

11. An industrial truck according to claim 9, wherein the sliding block is prestressed so as to bear against the sliding surface.