Claims
- 1. A rope-actuated load lifting and carrying assembly, comprising:
- (a) a support structure;
- (b) at least two gripping members for carrying a load;
- (c) a corner arm pivotally connecting each said gripping member to said support structure; and
- (d) a vertically moveable center pin assembly below the support structure, this assembly including a center pin about which each of the gripping members is pivotally connected such that the gripping members can close to take on a load and such that the gripping members can open by pivotal movement around the center pin to discharge a load;
- said center pin assembly further comprising at least one first rope guide rotationally mounted below the pivotal axis of the center pin, such that a rope may be reeved over this first rope guide for applying a vertical upward force to the center pin assembly to cause the center pin assembly to move vertically with respect to the support structure to thereby cause the pivotal closing movement of the gripping members, this first rope guide being at all times located beneath the center pin during the opening and closing motions of the gripping members;
- the support structure also further comprising a plurality of second rope guides disposed such that the axis of at least one of the second rope guides lies above a horizontal plane through the points of connection of said corner arms to the support structure, with the axis of none of the rope guides associated with said support structure lying below said horizontal plane; and
- a separate support member for supporting said first rope guide and said plurality of second rope guides.
- 2. The load lifting and carrying assembly of claim 1, wherein said gripping members are grapple tines.
- 3. The load lifting and carrying assembly of claim 1, wherein said gripping members are two clamshell scoop halves.
- 4. The load lifting and carrying assembly of claim 1, wherein said first and second rope guides are cylindrical sheaves.
- 5. The load lifting and carrying assembly of claim 1, wherein said first and second rope guides are grooved rollers.
- 6. The load lifting and carrying assembly of claim 5, wherein said grooved rollers are composed of a substance having a Rockwell C hardness of at least 60 and wherein the rope employed is wire rope.
- 7. The assembly as defined in claim 1, characterized by the center pin assembly further including at least two more rope guides, these two additional rope guides being located on opposed, horizontal diametric sides of the center pin such that a rope may be reeved over each of these two additional rope guides to be turned for purposes of being reeved over the first rope guide beneath the center pin.
- 8. The assembly as defined in claim 1, characterized by the center pin assembly including a pair of first rope guides mounted below the center pin, these rope guides being positioned such that a radial line through the center pin and each rope guide forms an angle of about 45.degree. with a horizontal plane through the center pin.
- 9. The assembly as defined in claim 1, wherein said first rope guide includes at least a pair of spaced, annular grooves for guiding rope.
- 10. A rope-actuated load lifting and carrying assembly of the type having
- (a) a head assembly,
- (b) at least two gripping members pivotally interconnected with the head assembly and being moveable between an open position and a gripping position, the members when in the gripping position being joined along a joinder plane defined therebetween,
- (c) a vertically moveable actuating assembly to which each of the gripping members are pivotally interconnected, such that downward vertical movement of the actuating assembly causes the gripping members to open and such that upward vertical movement of the actuating assembly causes the gripping members to close,
- (d) the actuating assembly also including at least a pair of rotationally mounted rope guides for guiding rope, these rope guides being mounted and arranged so that a rope will be reeved thereover such that the rope can be turned 180.degree. and such that the rope can exert an upward vertical force on the rope guides to cause upward vertical movement of the actuating assembly to close the gripping members, these rope guides being employed in lieu of a single larger sheave in order to achieve the same closing force but reducing the overall weight in the assembly, and each of the rope guides including at least a pair of spaced, annular grooves for receiving and guiding rope.
- 11. The assembly as defined in claim 10, characterized by the actuating assembly including a center pin about which the gripping members are pivotally mounted, the rope guides being arrayed such that at least one guide is mounted below the pivotal axis of the center pin such that this guide is at all times located beneath the center pin during the opening and closing motions of the gripping members.
- 12. The assembly as defined in claim 11, characterized by the actuating assembly including a pair of rope guides mounted below the center pin.
- 13. The assembly as defined in claim 11, characterized by the actuating assembly including at least three rope guides, at least two of the rope guides being mounted on opposed, horizontal, diametric sides of the center pin.
- 14. The assembly as defined in claim 10, further including a separate support member supporting each of said rope guides.
- 15. A rope-actuated load lifting and carrying assembly, comprising:
- (a) a head assembly;
- (b) at least two gripping members;
- (c) a corner arm connecting the outer side of each said gripping member to said head assembly;
- (d) a center pin assembly;
- (e) a hinge connecting the inner side of each said gripping member to said center pin assembly;
- wherein said center pin assembly further comprises a central load bearing shaft to which said hinges are connected, at least three support members radially arranged about said central load bearing shaft and a rope guide rotationally mounted on each of said support members to form a first group of rope guides, the rotational axis of each of the rope guides being essentially parallel to the axis of the central load bearing shaft and at least one of the guides being arranged such that its axis is positioned below a horizontal plane passing through the axis of the central load bearing shaft, and said rope guides occupying half the circumference of a circle centered on the axis of said central load bearing shaft and are angularly spaced apart by angle .alpha., where .alpha. equals 180 degrees divided by the number of said first rope guides minus one, each rope guide having at least a pair of spaced grooves for receiving and guiding rope, and
- wherein said head assembly comprises at least one additional rope guide located above a horizontal plane passing through the points of connection of said corner arms to said head assembly.
- 16. The load lifting and carrying assembly of claim 15, wherein said head assembly comprises at least three rope guides, constituting a second group of rope guides, which lie on half of the circumference of a circle and are angularly arrayed apart by an angle .beta., where .beta. equals 180 degrees divided by the number of said second group of rope guides minus one, and at least one of the rope guides associated with the head assembly being located above a horizontal plane passing through the points of connection of said corner arms to said head assembly.
- 17. The load lifting and carrying assembly of claim 15, wherein said gripping members are two clamshell scoop halves.
- 18. The load lifting and carrying assembly of claim 16, wherein the gripping members are two clamshell scoop halves.
- 19. The load lifting and carrying assembly of claim 16, wherein said gripping members are grapple tines.
- 20. The load lifting and carrying assembly of claim 16, wherein said first and second rope guides are cylindrical sheaves.
- 21. The load lifting and carrying assembly of claim 20, wherein said center pin assembly carries thereon at least ten sheaves.
- 22. The load lifting and carrying assembly of claim 16, wherein said first and second rope guides are grooved rollers.
- 23. The load lifting and carrying assembly of claim 22, wherein said center pin assembly carries thereon at least ten rollers.
- 24. The load lifting and carrying assembly of claim 16 or 17, and further comprising at least another additional rope guide on said head assembly over which is reeved a second rope to hold said load lifting and carrying assembly.
- 25. The load lifting and carrying assembly of claim 24, wherein said first group of rope guides and said additional rope guide are rollers and wherein said another additional rope guide is provided by a groove on a roller that also acts as one said additional rope guide.
- 26. The load lifting and carrying assembly of claim 25, wherein said grooved rollers are composed of a substance having a Rockwell C hardness of at least 60 and wherein the rope employed is wire rope.
- 27. The load lifting and carrying assembly of claim 15, wherein said gripping members are grapple tines.
- 28. The load lifting and carrying assembly of claim 15, wherein said first and second rope guides are cylindrical sheaves.
- 29. The load lifting and carrying assembly of claim 28, wherein said center pin assembly carries thereon at least ten sheaves.
- 30. The load lifting and carrying assembly of claim 15, wherein said first and second rope guides are grooved rollers.
- 31. The load lifting and carrying assembly of claim 30, wherein said center pin assembly carries thereon at least ten rollers.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of application Ser. No. 943,851, filed Sept. 19, 1978, now abandoned.
US Referenced Citations (11)
Foreign Referenced Citations (2)
Number |
Date |
Country |
503760 |
Jul 1930 |
DE2 |
576566 |
Apr 1933 |
DE2 |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
943851 |
Sep 1978 |
|