Device for a materials handling vehicle

• US 6,137,398 A
• Filed: 07/14/1998
• Issued: 10/24/2000
• Est. Priority Date: 07/16/1997
• Status: Expired due to Term

• Current Assignee: Crown Equipment Corporation
• Original Assignee: Crown Equipment Corporation
• Inventors: Soder, Patrick A., Turner, John A., Kahlig, Daniel W., Romer, Martin E., Dunlap, Danny L., Niemeyer, Larry A.
• Primary Examiner(s): Wu, Daniel J.
• Assistant Examiner(s): Huang, Sihong
• Application Number:
  US09/115,051
• Time in Patent Office: 833 Days
• Field of Search: 340/439, 340/438, 340/573.1, 340/576, 340/665, 340/666, 340/686.1, 180/273, 180/272, 180/274
• US Class Current: 340/439
• CPC Class Codes: B66F 17/003 for fork-lift trucks

Abstract

A materials handling vehicle is provided with a frame including an operator'"'"'s compartment having an entrance, a drive mechanism supported on the frame, a material handling unit coupled to the frame, and a device including an actuator located across the threshold of the entrance of the operator'"'"'s compartment. The device generates an alert signal when a portion of an operator'"'"'s body engages the actuator.

Claims

1. A materials handling vehicle comprising:

a frame including an operator'"'"'s compartment having an entrance;

a drive mechanism supported on said frame;

a material handling unit coupled to said frame; and

an entrance device including an actuator comprising an actuator bar located at an entry ledge of said entrance of said operator'"'"'s compartment, said device generating an alert signal when a portion of an operator'"'"'s body engages said actuator.

2. A materials handling vehicle as set forth in claim 1, wherein said device further comprises a micro switch and an alert device, said micro switch generating an actuation signal to said alert device when said actuator bar is engaged by said operator, said alert device generating said alert signal in response to receiving said actuation signal.

3. A materials handling vehicle as set forth in claim 2, wherein said micro switch is a normally closed micro switch.

4. A materials handling vehicle as set forth in claim 3, wherein said actuator bar is spring-biased upwardly.

5. A materials handling vehicle as set forth in claim 2, where said alert device generates an audible alert signal.

6. A materials handling vehicle as set forth in claim 2, where said alert device generates a visual alert signal.

7. A materials handling vehicle as set forth in claim 1, wherein said device further comprises first and second micro switches and an alert device, at least one of said micro switches generating an actuation signal to said alert device when said actuator bar is engaged by said operator, said alert device generating said alert signal in response to receiving said actuation signal from at least one micro switch.

8. A materials handling vehicle as set forth in claim 7, wherein said first and second micro switches are normally open micro switches.

9. A materials handling vehicle as set forth in claim 8, wherein said entrance device further includes one or more springs for biasing said actuator bar upwardly, said actuator bar moving against said one or more springs when engaged by said operator to allow one or both of said first and second micro switches to open.

10. A materials handling vehicle as set forth in claim 1, wherein said actuator bar extends from about 1/8 inch to about 1/2 inch above said entry ledge.

11. A truck comprising:

a frame including an operator'"'"'s compartment having an entrance;

a drive mechanism supported on said frame;

a material handling unit coupled to said frame; and

an entrance device comprising an actuator bar near an entry ledge of said entrance said device being adapted to generate an alert signal when a portion of an operator'"'"'s body engages said actuator bar.

12. A truck as set forth in claim 11, wherein said entrance device further comprises a micro switch and an alert device, said micro switch generating an actuation signal to said alert device when said actuator bar is engaged by said operator, said alert device generating said alert signal in response to receiving said actuation signal.

13. A materials handling vehicle as set forth in claim 12, where said alert device generates an audible alert signal.

14. A materials handling vehicle as set forth in claim 12, where said alert device generates a visual alert signal.

15. A truck as set forth in claim 12, wherein said micro switch is a normally closed micro switch.

16. A truck as set forth in claim 15, wherein said actuator bar is spring-biased upwardly.

17. A truck as set forth in claim 12, wherein said entrance device further comprises first and second micro switches and an alert device, at least one of said micro switches generating an actuation signal to said alert device when said actuator bar is engaged by said operator, said alert device generating said alert signal in response to receiving said actuation signal from at least one micro switch.

18. A truck as set forth in claim 17, wherein said first and second micro switches are normally open micro switches.