CA2359770A1 - Air lifting and balancing unit - Google Patents

Air lifting and balancing unit Download PDF

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Publication number
CA2359770A1
CA2359770A1 CA002359770A CA2359770A CA2359770A1 CA 2359770 A1 CA2359770 A1 CA 2359770A1 CA 002359770 A CA002359770 A CA 002359770A CA 2359770 A CA2359770 A CA 2359770A CA 2359770 A1 CA2359770 A1 CA 2359770A1
Authority
CA
Canada
Prior art keywords
drum
piston
chain
cylinder
air pressure
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.)
Granted
Application number
CA002359770A
Other languages
French (fr)
Other versions
CA2359770C (en
Inventor
Robert Otto Braesch
Peter Lee Hong
Thomas Arthur Mefferd
Michael David Olson
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.)
Columbus McKinnon Corp
Original Assignee
Individual
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
Priority claimed from US08/165,701 external-priority patent/US5439200A/en
Application filed by Individual filed Critical Individual
Publication of CA2359770A1 publication Critical patent/CA2359770A1/en
Application granted granted Critical
Publication of CA2359770C publication Critical patent/CA2359770C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Actuator (AREA)
  • Transmission Devices (AREA)

Abstract

An air lifting and balancing unit (10, 80) including a cylinder (12, 82), a piston (21, 107) in the cylinder (12, 82), a ball screw (24, 90) affixed to the piston (21, 107), a ball nut (42, 97) mounted for rotation on the ball screw (24, 90), a drum 45, 102) mounted on the ball nut, a chain (52, 114) driven by the drum (45, 102), and centrifugally actuated brakes (62, 117) mounted on the drum (45, 102) for stopping rotation of the drum when the drum (45, 102) exceeds a predetermined acceleration either due to a loss of load or to a loss of air pressure applied to the piston (21, 107), and a pneumatic circuit (140) in communication with the cylinder (12, 82) for providing air pressure thereto which applies a force on the piston (21, 107) which is at a substantially constant incremental value in opposition to the force exerted by the load (69) applied to the piston (21, 107) through the chain (52, 114) and the drum (45, 102) and the ball screw (24, 90) regardless of variations in said air pressure to thereby cause the speed of the chain (52, 114) to remain substantially constant.
CA002359770A 1993-12-10 1994-12-08 Air lifting and balancing unit Expired - Fee Related CA2359770C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/165,701 US5439200A (en) 1993-12-10 1993-12-10 Air lifting and balancing unit
US08/165,701 1993-12-10
CA002176026A CA2176026C (en) 1993-12-10 1994-12-08 Air lifting and balancing unit

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002176026A Division CA2176026C (en) 1993-12-10 1994-12-08 Air lifting and balancing unit

Publications (2)

Publication Number Publication Date
CA2359770A1 true CA2359770A1 (en) 1995-06-15
CA2359770C CA2359770C (en) 2002-08-20

Family

ID=25678456

Family Applications (2)

Application Number Title Priority Date Filing Date
CA002359770A Expired - Fee Related CA2359770C (en) 1993-12-10 1994-12-08 Air lifting and balancing unit
CA002359774A Expired - Fee Related CA2359774C (en) 1993-12-10 1994-12-08 Air lifting and balancing unit

Family Applications After (1)

Application Number Title Priority Date Filing Date
CA002359774A Expired - Fee Related CA2359774C (en) 1993-12-10 1994-12-08 Air lifting and balancing unit

Country Status (1)

Country Link
CA (2) CA2359770C (en)

Also Published As

Publication number Publication date
CA2359774A1 (en) 1995-06-15
CA2359770C (en) 2002-08-20
CA2359774C (en) 2003-07-22

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed

Effective date: 20121210