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GB2215297A - Variable diameter winch drive - Google Patents

Variable diameter winch drive Download PDF

Info

Publication number
GB2215297A
GB2215297A GB8805319A GB8805319A GB2215297A GB 2215297 A GB2215297 A GB 2215297A GB 8805319 A GB8805319 A GB 8805319A GB 8805319 A GB8805319 A GB 8805319A GB 2215297 A GB2215297 A GB 2215297A
Authority
GB
United Kingdom
Prior art keywords
winch
drum
effective diameter
variable diameter
winch drive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB8805319A
Other versions
GB8805319D0 (en
Inventor
Roland Metcalfe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TRENT POLYTECHNIC
Original Assignee
TRENT POLYTECHNIC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TRENT POLYTECHNIC filed Critical TRENT POLYTECHNIC
Priority to GB8805319A priority Critical patent/GB2215297A/en
Publication of GB8805319D0 publication Critical patent/GB8805319D0/en
Publication of GB2215297A publication Critical patent/GB2215297A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/60—Rope, cable, or chain winding mechanisms; Capstans adapted for special purposes
    • B66D1/74—Capstans
    • B66D1/7421—Capstans having a vertical rotation axis
    • B66D1/7436—Capstans having a vertical rotation axis drivable by both motor and manually
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/60—Rope, cable, or chain winding mechanisms; Capstans adapted for special purposes
    • B66D1/74—Capstans
    • B66D1/7494—Self-tailing capstans

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Flexible Shafts (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)

Abstract

A winch, e.g., a yacht sheet winch, has an effective diameter that can vary in relation to the tension in the cable passing round the drum. The drum is constructed with pivoting plates (8) controlled by pins (9) engaged with a cam (3). The plates are returned to a larger effective diameter position by springs (7) when the cable tension reduces. <IMAGE>

Description

VARIABLE DIAMETER WINCH DRIVE This invention relates to a variable diameter winch drive.
A winch is a well known device that by means of mechanical advantage enables cable to be translated and tensioned.
Existing winches derive their mechanical advantage from the length of the operating lever in relation to the diameter of the drum and a system of gearing generally within the drum. Some winches contain complex gearing that enables the ratio to b changed whilst in operation.
According to the present invention there is provided a variable diameter drum such that as the tension in the cable increases, the diameter reduces giving an in@reased mechanical advantage. This can be combined with conventiona gearing mechanism to increase the total range of mechanical advantage.
A specific embodiment of the invention will now be descr@bad by way of example with reference to the accompanying drawing in which: Figure @ shows a plan of the winch with the drum at @ts largest effective diameter.
Figure 2 shows an elevation with the drum at @ts largest effective diareter.
Figure @ shows a plan @@ @@e winch the drum at @t@ sh@@est effective diameter.
Figure 4 shows an elevation with the drum in its sr@alle@@ effective diameter.
Referring to the drawings the winch comprises a handle attachment 1 which is on the end of shaft 2. The cam 3 can be attached to shaft 2 or a concentric shaft 5 driven through gearing in the base 4.
As the tension in cable 6 increases, pins 9 which bear on cam 3 constrain the cam because of its profile to rotate against the force provided by the springs 7. The effective diameter round which the cable passes is reduced by the plates 8 pivoting inwards about pivots 10.
With reduce3 tension in cable 6, the springs 7 will returr. plates E to larger effective diameter.

Claims (4)

CLLIKS
1. A winch whose effective diameter comprises a number of pivoted plates such that the diameter is variable.
2. A winch as in Claim 1 wherein a means exist to control the effective diameter.
3. A winch as in Claim 1 and Claim 2 that can be driven through a direct means.
4. A winch as in Claim 1 and Claim 2 that can be driven through a ratio changing mechanism.
GB8805319A 1988-03-05 1988-03-05 Variable diameter winch drive Withdrawn GB2215297A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8805319A GB2215297A (en) 1988-03-05 1988-03-05 Variable diameter winch drive

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8805319A GB2215297A (en) 1988-03-05 1988-03-05 Variable diameter winch drive

Publications (2)

Publication Number Publication Date
GB8805319D0 GB8805319D0 (en) 1988-04-07
GB2215297A true GB2215297A (en) 1989-09-20

Family

ID=10632942

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8805319A Withdrawn GB2215297A (en) 1988-03-05 1988-03-05 Variable diameter winch drive

Country Status (1)

Country Link
GB (1) GB2215297A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9301178A (en) * 1993-07-05 1995-02-01 Meissner Engineering B V Winch.
GB2296229A (en) * 1994-12-20 1996-06-26 Alform Extrusions Ltd Winding drum
EP0759408A1 (en) * 1995-08-18 1997-02-26 Harken Inc. Winch with two speed ratio drum
US9586794B2 (en) 2013-05-03 2017-03-07 Illinois Tool Works Inc. Winch having adjustable initial mechanical advantage

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9301178A (en) * 1993-07-05 1995-02-01 Meissner Engineering B V Winch.
EP0637565A1 (en) * 1993-07-05 1995-02-08 Meissner Engineering B.V. Winch
US5593140A (en) * 1993-07-05 1997-01-14 Meissner Engineering B.V. Winch having a housing with a smooth-surfaced central portion
GB2296229A (en) * 1994-12-20 1996-06-26 Alform Extrusions Ltd Winding drum
EP0759408A1 (en) * 1995-08-18 1997-02-26 Harken Inc. Winch with two speed ratio drum
US9586794B2 (en) 2013-05-03 2017-03-07 Illinois Tool Works Inc. Winch having adjustable initial mechanical advantage

Also Published As

Publication number Publication date
GB8805319D0 (en) 1988-04-07

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)