HOIST SYSTEM

• US 3,801,070 A
• Filed: 08/26/1971
• Issued: 04/02/1974
• Est. Priority Date: 12/05/1969
• Status: Expired due to Term

• Current Assignee: Frank N. Piasecki
• Original Assignee: Frank N. Piasecki
• Inventors: Piasecki, Frank N.
• Primary Examiner(s): Blunk, Evon C.
• Assistant Examiner(s): Rowland, James L.
• Application Number:
  US05/175,390
• Time in Patent Office: 950 Days
• Field of Search: 294/67DA,67A,81,81SF 212/11,14,18,125,126,127,128 254/144 244/137R 214/75H
• US Class Current: 254/285
• CPC Class Codes: B64D 1/22 Taking-up articles from earth's surface
• CPC Class Codes: B66C 1/10 by mechanical means
• CPC Class Codes: B66C 1/16 Slings with load-engaging platforms or frameworks
• CPC Class Codes: B66C 13/08 for depositing loads in desired attitudes or positions

Abstract

A hoist system including elevated means having spaced contact points, carrier means disposed below the elevated means, having similarly arranged contact points, cable means operatively interconnecting the contact points for carrying the carrier means below the elevated means, means for varying the effective length of the cable means disposed at a selected contact point, one end of the cable means being fixedly secured to a selected contact point and the opposite end thereof being operatively connected to the cable length varying means whereby upon operation of the cable length varying means the effective length of the cable means will be varied correspondingly to vary the vertical displacement of the carrier means relative to the elevated means.

Claims

1. A hoist system comprising elevated means having spaced arranged contact points disposed at the verticies of a rectangle;

carrier means disposed below said elevated means, and having similarly spaced arranged contact points disposed at the verticies of a rectangle;

a single cable operatively interconnecting said contact points for carrying said carrier means below said elevated means;

means for varying the effective length of said cable disposed at a selected contact point, one end of said cable being fixedly secured to a selected contact point and the opposite end thereof being operatively connected to said cable-length-varying means whereby upon operation of said cable-length-varying means the effective length of said cable will be varied correspondingly to vary the vertical disposition of said carrier means relative to said elevated means;

depending means operatively connected to said elevated means centrally relative to said contact points disposed on said elevated means; and

means for varying the effective length of said depending means, said depending means being connected at the lower end thereof to said cariier means.

2. A hoist system according to claim 1, wherein said carrier means comprises a pallet to which a load to be hoisted may be secured.

3. A hoist system according to claim 1, wherein the contact points other than the contact points at which the ends of said cable are connected, include sheaves about which said cable is reeved.

4. A hoist system according to claim 1, wherein each of the contact points on said carrier means includes a sheave, diagonally opposed contact points on said elevated means are provided with sheaves, said cable length varyingmeans comprises a first winch secured to said elevated means at a contact point spaced from said diagonally opposed sheaves, said means for varying the effective length of said depending means comprises a second winch, and said cable having one end thereof fixedly secured to said elevated means at a contact point diagonally opposed to said first winch, a first segment extending downwardly and reeved under a first sheave disposed on said carrier means, a second segment extending transversely and reeved under a second sheave on said carrier means, a third segment extending upwardly and reeved over one of said diagonally opposed sheaves secured to said elevated means, of fourth segment extending diagonally and reeved over the other of said diagonally opposed sheaves, a fifth segment extending downwardly and reeved under a third sheave secured to said carrier means, a sixth segment extending transversely and reeved under a fourth sheave secured to said carrier means and a seventh segment extending upwardly and being operatively connected to said first winch whereby upon operation of said first and second winches by respective drives therefor, the effective lengths of said cable segments and said depending means will be varied correspondingly to vary the vertical displacement of said carrier means relative to said elevated means.

5. A hoist system according to claim 4, wherein the drives of said first and second winches are synchronized.

6. A hoist system according to claim 5, wherein the unDerside of said pallet includes spaced means engageable by said load.

7. A hoist system according to claim 4, wherein said carrier means is provided with a hook operatively connectable to the cargo to be lifted.

8. A hoist system according to claim 4;

wherein said carrier means comprises a pallet to which a load to be hoisted may be secured.