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 Title: |
US5899304:
Motor brake
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Daugherty, Jack L.; DeRidder, LA 70634
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| Assignee: |
None
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| Published / Filed: |
1999-05-04
/ 1997-05-21
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| Application Number: |
US1997000861158
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| IPC Code: |
Advanced:
B66D 5/08;
F16D 49/16;
F16D 59/02;
F16D 65/14;
Core:
B66D 5/00;
F16D 49/00;
F16D 59/00;
more...
IPC-7:
B60T 13/04;
F16D 49/16;
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| ECLA Code: |
B66D5/08; F16D49/16; F16D59/02; F16D65/14D6D4;
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| U.S. Class: |
Current:
188/171;
188/075;
188/216;
Original:
188/171;
188/075;
188/216;
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| Field of Search: |
188/171,173,74,75,76,216,163,165,161,158,156,196 M,196 V,79.57
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| Priority Number: |
| 1997-05-21 |
US1997000861158 |
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| Abstract: |
The present invention is a fail safe motor brake for use with relatively large industrial motors, and particularly electric hoist motors as used with large overhead industrial cranes. The present brake includes an actuation linkage which results in relatively little change in the initial height or "air gap" of the solenoid plunger or armature, as the brake linings wear. The limited change in the air gap is due to a mechanical stop which is built into the adjustment and actuation linkage, as well as the clamping pressure provided by the spring arrangement which serves to actuate the brakes. The solenoid of the present brake is offset from the plane of the brake shoes, thus allowing removal and replacement of one or both shoes without need to remove the solenoid. This allows the brake shoes to be removed without need to readjust the actuation linkage. The present motor brake provides excellent performance throughout the life of the brake linings, without need to adjust the actuation linkage during this period. The present motor brake may also include other features which provide for long life and ease of maintenance, such as sealed bearings, additional lubrication points, and an attached air gap gauge and brake drum locking pin, to prevent "block drop," or falling of the hoist block due to the motor being allowed to turn, when the brake is released for service.
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| Attorney, Agent or Firm: |
Litman, Richard C. ;
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| Primary / Asst. Examiners: |
Butler, Douglas C.;
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| INPADOC Legal Status: |
None
Family Legal Status Report
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| Designated Country: |
AL AM AP AT AZ BA BB BG BR BY CA CH CN CU CZ DE DK EA EE EP ES FI GB GE GH HU IL IS JP KE KG KP KR KZ LC LK LR LS LT
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| Family: |
Show 3 known family members
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First Claim:
Show all 20 claims |
I claim:
1. A motor brake for a motor brake drum, comprising:
- a base;
- a pair of first brake arms and an opposite pair of second brake arms, with each of said brake arms having a lower end, an opposite upper end, and a generally central brake shoe mounting passage therethrough;
- said lower end of each of said brake arms being pivotally secured to said base;
- a first brake shoe and an opposite second brake shoe, with each said brake shoe being pivotally secured respectively between said first brake arms and said second brake arms at a respective said brake shoe mounting passage;
- a first tension rod and a separate second tension rod, each having a first portion and an opposite second portion pivotally connected at an attachment point respectively between each said upper end of said first brake arms and each said upper end of said second brake arms;
- each said tension rod further including a distal end, with a compression spring adjustably installed between each said distal end and said attachment point of each said tension rod;
- a brake release pushrod disposed between each said tension rod and centered above each said brake shoe, with said brake release pushrod defining a vertical brake shoe actuation plane;
- a brake release pin pivotally mounted through each said upper end of said second brake arms, with said brake release pushrod being offset from and pivotally secured to said brake release pin;
- a solenoid having a vertically movable plunger therein, with said solenoid being affixed to said base at a point clear of said brake shoe actuation plane and each said brake shoe; and
- said plunger of said solenoid communicating with said brake release pin through a linkage, for releasing each said brake shoe from the motor brake drum by rotating said brake release pin to move said brake release pushrod to urge said brake shoes apart against said springs of said, tension rods when said solenoid is electrically actuated to retract said plunger therein.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 6 U.S. patent(s) that reference this one
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