Pneumatic type hoist

Application Number: 00108995
Application Date: 2000.05.26
Publication Number: 1291585
Publication Date: 2001.04.18
Priority Information: 1999/5/27 US 09/320,935
International: B66B9/04
Applicant(s) Name: Ansurmo John. Madge
Inventor(s) Name: A. Madge
Patent Agency Code: 31100
Patent Agent: wu menghua
Abstract A pneumatically operated elevator has a pair of elongated vertical tubular cylindrical shafts and horizontally extending cross-over shafts extending between the vertical shafts adjacent their upper and lower ends to provide a substantially closed system. A cab is disposed within one of the vertical shafts, and a fan in at least one of the cross-over shafts moves air between the ends of the shafts to produce a pressure differential above and below the cab to cause the cab to move upwardly and downwardly in the one shaft. At least one vent is provided to admit air into at least one of the shafts to compensate for leakage from the shafts.