Self-erecting tower crane with bayonet joints between sections

• US 3,250,401 A
• Filed: 12/17/1964
• Issued: 05/10/1966
• Est. Priority Date: 12/17/1964
• Status: Expired due to Term

• Current Assignee: Trevor O. Davidson
• Original Assignee: Trevor O. Davidson
• Inventors: Davidson, Trevor O.
• Application Number:
  US04/419,111
• Time in Patent Office: 509 Days
• US Class Current: 212/176
• CPC Class Codes: B66C 23/286 with locking devices
• CPC Class Codes: E04H 12/34 Arrangements for erecting or lowering towers, masts, poles, chimney stacks, or the like
• CPC Class Codes: Y10T 403/7045 Interdigitated ends
• CPC Class Codes: Y10T 403/7123 Traversed by connector

Claims

1. IN A TOWER CRANE THE COMBINATION COMPRISING:

A TOWER FORMED OF A PLURALITY OF SECTIONS;

TWIST CONNECTIONS BETWEEN THE TOWER SECTIONS;

A REVOLVABLE FRAME THAT IS MOVABLE ALONG AND REVOLVABLE ABOUT THE TOWER;

AND JAW MEANS MOUNTED ON AND REVOLVABLE WITH THE FRAME AND ADAPTED TO ENGAGE THE TOWER TO ENABLE THE FRAME TO BE USED AS A WRENCH TO CONNECT AND DISCONNECT THE TOWER SECTIONS.