# US 4,399,979 A · Device for self-tailing a conventional winch drum

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,399,979 A
- Document ID: US4399979A
- Status: Granted
- Kind: A
- Application number: 06/004,840
- Filed: 1979-01-19
- Granted: 1983-08-23
- Earliest claimed: 1978-01-04
- Inventors: Michael R. Adelman
- Web page: https://patentgrep.com/patent/US4399979A

## CPC

- B66D 1/7431: {driven manually only}
- B66D 1/7494: {Self-tailing capstans}
- B66D: CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS (winding or unwinding ropes or cables for feeding or storage purposes B65H; rope or cable winding or unwinding mechanisms for lifts B66B)

## Abstract

A device for self-tailing a conventional winch drum utilizing the motion of the hauled in line under load to provide, through a multiple sheave assembly, the tension on the free end of the line necessary to render the winch drum operational and properly haul in the line.

## Claims

### Claim 1

A device for self-tailing a winch, comprising:
a frame member having a pair of coaxial sheaves journalled thereon, a first one of said sheaves having a groove configured to securely grip a line and the second sheave having a groove configured to frictionally receive a line;
a clutch device connecting said sheaves for positively rotating said first sheave by said second sheave in at least one direction; and
means adapted to prevent rotation of at least said first sheave in the other direction, whereby a line to be hauled may be reeved in the groove of said second sheave, trained around a winch or the like then reeved in the groove of said first sheave and thereby effect self-tailing when said line is hauled by said winch to rotate said second sheave in said one direction.

### Claim 2 (depends on 1)

A device as defined in claim 1 wherein said last-named means comprises a ratchet mechanism between said second sheave and said frame.