Protective pads for overhead lifting

• US 4,124,244 A
• Filed: 12/21/1976
• Issued: 11/07/1978
• Est. Priority Date: 12/21/1976
• Status: Expired due to Term

• Current Assignee: John G. Bryant
• Original Assignee: John G. Bryant
• Inventors: Bryant, John G.
• Primary Examiner(s): Cherry, Johnny D.
• Application Number:
  US05/752,723
• Time in Patent Office: 686 Days
• Field of Search: 294/74-77, 138/130, 138/144, 156/171, 156/188, 190/37, 217/69, 206/453, 206/586, 206/597, 224/49, 428/377
• US Class Current: 294/74
• CPC Class Codes: B66C 1/12 Slings comprising chains, wires, ropes, or bands; Nets article side grippers suspended by ropes or chains from crane hooks B66C1/42
• CPC Class Codes: B66C 1/18 Band-type slings

Abstract

A pad to be disposed between a load and a sling. The pad has at least two woven Nylon bands or layers joined together by a yieldable, flexible adhesive. The warp threads of the bands are respectively angularly oriented.

Claims

1. In a pad for use between a load and an overhead lifting sling wherein the pad receives a compression load during the lift:

a plurality of layers disposed closely adjacent one another at least one layer to engage the sling and at least another layer to engage the load and each layer comprising band means having a woven construction with warp and woof threads which inter-lock and function to hold one another in the layer to take said compression load and the respective band means being oriented so that as between adjacent band means contiguous parallel planes containing warp threads of one band means respectively angularly intersect warp threads of the other band means.

2. The pad of claim 1 characterized by:

first and second annular shaped layers, the layers being co-axial about an axis and one layer being inside the other, the inside layer to receive and engage the sling and the outside layer to engage the load;

yieldable, flexible adhesive means between the layers and connecting the layers together;

said first layer comprising a first woven band wound into a helix about said axis whereby the warp and woof threads of the band each respectively extend at an angle to a plane containing said axis; and

said second layer comprising a second woven band wound into a helix about said axis whereby the warp and woof threads of the second band each respectively extend at an angle to said plane, the direction of the helix of the second band being opposite the direction of the helix of the first band.

3. In combination;

The pad of claim 1 further including a wire rope sling and characterized by;

first and second annular shaped layers, the layers being co-axial about an axis and the second layer being inside the first, and the second layer being tightly engaged with the periphery of the sling;

yieldable, flexible adhesive means between the layers and connecting the layers together;

said first layer comprising a first woven band wound into a helix about said axis whereby the warp and woof threads of the band each respectively extend at an angle to a plane containing said axis; and

said second layer comprising a second woven band wound into a helix about said axis whereby the warp and woof threads of the second band each respectively extend at an angle to said plane, the direction of the helix of the second band being opposite the direction of the helix of the first band.

4. The combination of claim 3 further including a band of cushioning/filler material between the sling and said second layer.

5. In a pad for use between a load and an overhead lifting sling:

first and second annular layers, the second layer being disposed inside the first layer and each formed in the shape of an oval and being co-axial about an axis, the long sides of the oval of the outer layer being adapted to engage the load or the sling;

yieldable, flexible adhesive between the layers and connecting the layers together;

said first layer comprising a first woven band having warp and woof threads and wound into a helix about said axis whereby the warp and woof threads of the band each respectively extend at an angle to a plane containing said axis;

said second layer comprising a second woven band having warp and woof threads and wound into a helix about said axis whereby the warp and woof threads of the second band each respectively extend at an angle to said plane, the direction of the helix of the second band being opposite the direction of the helix of the first band;

means at the opposite ends of said layers connecting the respective ends together; and

strap means at the opposite ends of said layers for connecting the pad to a sling.

6. In a pad for use between a load and an overhead lifting sling:

first and second annular layers, the second layer being disposed inside the first layer and each formed in the shape of an oval and being co-axial about an axis, the long sides of the oval of the outer layer being adapted to engage the load or the sling;

yieldable, flexible adhesive between the layers and connecting the layers together;

said first layer comprising a first woven band having warp and woof threads and wound into a helix about said axis whereby the warp and woof threads of the band each respectively extend at an angle to a plane containing said axis;

said second layer comprising a second woven band having warp and woof threads and wound into a helix about said axis whereby the warp and woof threads of the second band each respectively extend at an angle to said plane, the direction of the helix of the second band being opposite the direction of the helix of the first band;

a generally planar third layer inside of the second layer, the third layer comprising a woven band having warp and woof threads, the warp threads of which extend generally parallel to said axis;

means at the opposite ends of said layers connecting the respective ends together; and

strap means at the opposite ends of said layers for connecting the pad to a sling.

7. In a pad for use between a load and overhead lifting sling:

at least a pair of ply means disposed closely adjacent one another, one ply means to engage the load and the other ply means to engage the sling, each ply means including band means having a woven construction with warp and woof threads which inter-lock and function to hold one another in the band means and the respective band means being oriented so that as between adjacent band means contiguous parallel planes containing warp threads of one band means respectively angularly intersect warp threads of the other band means; and

slide permitting means between said ply means and operative when the ply means are in lifting condition to permit relative sliding motion between the ply means and thereby provide for relative sliding motion between load and sling to occur without the load and sling being in contact.

8. In a pad for use between a load and an overhead lifting sling:

annular shaped outer ply means and annular shaped inner ply means disposed inside the outer ply means, the ply means being co-axial about an axis and the outer ply means to engage the load and the inner ply means to receive and engage the sling;

the outer ply means comprising first and second annular shaped layers one inside the other, yieldable, flexible adhesive means between the layers and connecting the layers together, the first layer comprising a first woven band having warp and woof threads and wound into a helix about said axis whereby the warp and woof threads of the band each respectively extend at an angle to a plane containing said axis and said second layer comprising a second woven band wound into a helix about said axis whereby the warp and woof threads of the second band each respectively extend at an angle to said plane, the direction of the helix of the second band being opposite the direction of the helix of the first band;

the inner ply means comprising third and fourth annular shaped layers one inside the other, yieldable, flexible adhesive between the layers and connecting the layers together, the third layer comprising a woven third band having warp and woof threads and wound into a helix about said axis whereby the warp and woof threads of the third band each respectively extend at an angle to said plane and said fourth layer comprises a woven fourth band having warp and woof threads and wound into a helix about said axis whereby the warp and woof threads of the fourth band each respectively extend at an angle to said plane, the direction of the helix of the fourth band being opposite the direction of the helix of the third band; and

slide permitting means between said ply means and operative when the ply means are in lifting condition to permit relative sliding motion between the ply means and thereby provide for relative sliding motion between load and sling to occur without the load and sling being in contact.

9. In a pad for use between a load and an overhead lifting sling:

first ply means comprising first elongated woven band means having warp and woof threads, the warp threads running longitudinally of the band means;

second ply means comprising second elongated woven band means having warp and woof threads, the warp threads running longitudinally of the second band means, the first and second band means extending in the same direction whereby the respective warp threads are generally parallel;

slide permitting means including third ply means disposed between the first and second ply means and comprising third woven band means having warp and woof threads, the warp threads of the third band means running transverse the longitudinal axis of the third band means whereby contiguous parallel planes containing the warp threads of the third woven band means angularly intersect at an angle of substantially 90°

the warp threads of the first and second woven band means, said third ply means being operative when the ply means are in lifting condition to permit relative sliding motion between the first and second ply means and thereby provide for relative sliding motion between load and sling to occur without the load and sling being in contact; and

means at opposite ends of said ply means connecting the respective ends together including strap means for connecting the pad to a sling.

10. In a pad for use between a load and an overhead lifting sling:

annular shaped outer ply means and annular shaped inner ply means disposed inside of the outer ply means, the ply means being co-axial about an axis and the inner ply means to engage the load and the outer ply means to engage the sling;

the outer ply means comprising first and second annular shaped layers one inside the other, yieldable, flexible adhesive means between the layers and connecting the layers together, the first layer comprising a plurality of sections of woven bands disposed side-by-side with adjacent edges abutting and each band section having warp and woof threads, the respective warp threads of which extend at an angle to a plane containing said axis and the second layer comprising a plurality of sections of woven bands disposed side-by-side with adjacent edges abutting and each band section having warp and woof threads and the respective warp threads of which extend at an angle to said plane, the last said angle being different from the first said angle;

the inner ply means comprising third and fourth annular shaped layers, one inside the other, yieldable, flexible adhesive means between the layers and connecting the layers together, the third layer comprising a plurality of sections of woven bands disposed side-by-side with adjacent edges abutting and each band section having warp and woof threads, the respective warp threads of which extend at an angle to said plane and the fourth layer comprising a plurality of sections of woven bands disposed side-by-side with adjacent edges abutting and each band section having warp and woof threads the respective warp threads of which extend at an angle to said plane, the last two said angles being different from one another; and

slide permitting means between said ply means and operative when the ply means are in lifting condition to permit relative sliding motion between the ply means and thereby provide for relative sliding motion between load and sling to occur without the load and sling being in contact.

11. The pad of claim 10 characterized by that:

the inner ply means is discontinuous at an area defined by that opposite ends of the inner ply means are closely adjacent one another;

a cover over said area;

a plurality of straps around said inner ply means whereby the inner ply means is maintained in said annular shape and the cover is maintained in position;

the outer ply means is discontinuous at an area defined by that opposite ends of the outer ply means are closely adjacent one another;

a cover over the last said area; and

a plurality of straps around said outer ply means whereby the outer ply means is maintained in said annular shape and the cover is maintained in position.

12. In a pad for use between a load and an overhead lifting sling:

annular shaped outer ply means and annular shaped inner ply means, the ply means being co-axial about an axis and the inner ply means to engage the load and the outer ply means to engage the sling;

the outer ply means comprising first and second annular shaped layers one inside the other, the first layer comprising a plurality of sections of woven bands disposed side-by-side with adjacent edges abutting and each band section having warp and woof threads, the respective warp threads of which extend at an angle to a plane containing said axis and the second layer comprising a plurality of sections of woven bands disposed side-by-side with adjacent edges abutting and each band section having warp and woof threads, the respective warp threads of which extend at an angle to said plane, the last said angle being different from the first said angle;

the inner ply means comprising third and fourth annular shaped layers, one inside the other, the third layer comprising a plurality of sections of woven bands disposed side-by-side with adjacent edges abutting and each band section having warp and woof threads, the respective warp threads of which extend at an angle to said plane and the fourth layer comprising a plurality of sections of woven bands disposed side-by-side with adjacent edges abutting and each band section having warp and woof threads, the respective warp threads of which extend at an angle to said plane, the last two said angles being different from one another; and

slide permitting means between said ply means and operative when the ply means are in lifting condition to permit relative sliding motion between the ply means and thereby provide for relative sliding motion between load and sling to occur without the load and sling being in contact.

13. The pad of claim 12 characterized by that:

the inner ply means is discontinuous at an area defined by that opposite ends of the inner ply means are closely adjacent one another;

a cover over said area;

a plurality of straps around said inner ply means whereby the inner ply means is maintained in said annular shape and the cover is maintained in position;

the outer ply means is discontinuous at an area defined by that opposite ends of the outer ply means are closely adjacent one another;

a cover over the last said area; and

a plurality of straps around said outer ply means whereby the outer ply means is maintained in said annular shape and the cover is maintained in position.

14. The combination of a wire rope sling and a pad for use between the sling and the load, the pad comprising:

annular shaped outer ply means and annular shaped inner ply means disposed inside the outer ply means, the ply means being co-axial about an axis and the outer ply means to engage the load and the inner ply means being tightly engaged with the periphery of the sling;

the outer ply means comprising first and second annular shaped layers one inside the other, yieldable, flexible adhesive means between the layers and connecting the layers together, the first layer comprising a first woven band having warp and woof threads and wound into a helix about said axis whereby the warp and woof threads of the band each respectively extend at an angle to a plane containing said axis and said second layer comprising a second woven band having warp and woof threads and wound into a helix about said axis whereby the warp and woof threads of the second band each respectively extend at an angle to said plane, the direction of the helix of the second band being opposite the direction of the helix of the first band;

the inner ply means comprising third and fourth annular shaped layers one inside the other, yieldably, flexible adhesive between the layers and connecting the layers together, the third layer comprising a woven third band having warp and woof threads and wound into a helix about said axis whereby the warp and woof threads of the third band each respectively extend at an angle to said plane and said fourth layer comprises a woven fourth band having warp and woof threads and wound into a helix about said axis whereby the warp and woof threads of the fourth band each respectively extend at an angle to said plane, the direction of the helix of the fourth band being opposite to the direction of the helix of the third band; and

slide permitting means between said ply means and operative when the ply means are in lifting condition to permit relative sliding motion between the ply means and thereby provide for relative sliding motion between load and sling to occur without the load and sling being in contact.

15. In combination:

a load having an annular shaped portion and an annular shaped protective pad mounted on said portion to engage a lifting sling and receive a compression load during the lift, the pad comprising;

a plurality of layers disposed closely adjacent one another, at least one layer to engage the sling and at least another layer to engage the load and each layer including band means having a woven construction with warp and woof threads which interlock and function to hold one another in the layer to take said compression load and the respective band means being oriented so that as between adjacent band means contiguous parallel planes containing warp threads of one band means respectively angularly intersect warp threads of the other band means, each angle of intersection being an angle other than a 90°

angle.

16. In combination:

a load having an annular shaped portion and an annular shaped protective pad mounted on said portion, the pad comprising;

at least a pair of ply means disposed closely adjacent one another, one ply means engaging the annular shaped portion and the other ply means being adapted to be engaged by a sling for lifting the load, each ply means including at least a pair of closely adjacent band means each having a woven construction with warp and woof threads and the respective band means being oriented so that as between adjacent band means contiguous parallel planes containing warp threads of one band means respectively angularly intersect warp threads of the other band means, each angle of intersection being an angle other than a 90°

angle; and

slide permitting means between said ply means and operative when the ply means are in lifting condition to permit relative sliding motion between the ply means and thereby provide for relative sliding motion between load and sling to occur without the load and sling being in contact.

17. In combination, a sling and a pad for use between the sling and a load to be lifted, the pad comprising:

first and second annular shaped layers, the layers being co-axial about an axis and the second layer being inside the first, and the second layer being engaged with the periphery of the sling;

said first layer comprising first woven band means having warp and woof threads and wound into a helix about said axis whereby the warp and woof threads of the band means each respectively extend at an angle to a plane containing said axis;

said second layer comprising second woven band means having warp and woof threads and wound into a helix about said axis whereby the warp and woof threads of the second band means each respectively extend at an angle to said plane, the direction of the helix of the second band means being opposite the direction of the helix of the first band means; and

yieldable, flexible adhesive means between said layers and connecting the layers together.

18. In combination:

a load having an annular shaped portion and an annular shaped protective pad mounted on said portion to engage a lifting sling and receive compression load during the lift, the pad comprising;

a plurality of layers disposed closely adjacent one another, at least one layer to engage the sling and at least another layer to engage the load and each layer having at least two sets of threads which interlock and function to hold one another in the layer to take said compression load, the respective layers being oriented so that as between adjacent layers contiguous parallel planes containing threads of at least one set in one layer angularly intersect threads of at least one set in the other layer, each angle of intersection being an angle other than a 90°

angle.

19. In combination:

a load having an annular shaped portion and an annular shaped protective pad mounted on said portion, the pad comprising;

at least a pair of ply means disposed closely adjacent one another, one ply means engaging the annular shaped portion and the other ply means being adapted to engage a sling, each ply means including band means having a woven construction with warp and woof threads which inter-lock and function to hold one another in the band means and the respective band means being oriented so that as between adjacent band means contiguous parallel planes containing warp threads of one band means respectively angularly intersect warp threads of the other band means; and

slide permitting means between said ply means and operative when the ply means are in lifting condition to permit relative sliding motion between the ply means and thereby provide for relative sliding motion between the annular portion and sling to occur without the annular portion and sling being in contact.

20. In a pad for use between a load an overhead lifting sling:

first ply means comprising first elongated woven band means having warp and woof threads, the warp threads running longitudinally of the band means;

second ply means comprising second elongated woven band means having warp and woof threads, the warp threads running longitudinally of the second band means and the first and second band means extending in the same direction whereby the respective warp threads are generally parallel;

slide permitting means including third ply means disposed between the first and second ply means and comprising third woven band means having warp and woof threads, the warp threads of the third band means running transverse to the longitudinal axis of the third band means whereby contiguous parallel planes containing the warp threads of the third woven band means angularly intersect the warp threads of the first and second woven band means, said third ply means being operative when the ply means are in lifting condition to permit relative sliding motion between the first and second ply means and thereby provide for relative sliding motion between load and sling to occur without the load and sling being in contact; and

means at opposite ends of said ply means connecting the respective ends together including strap means for connecting the pad to the sling.

21. In a pad for use between a load and an overhead lifting sling wherein the pad receives a compression load during the lift:

a plurality of layers disposed closely adjacent one another, at least one layer to engage the sling and at least another layer to engage the load and each layer having at least two sets of threads which interlock and function to hold one another in the layer to take said compression load, the respective layers being oriented so that as between adjacent layers contiguous parallel planes containing threads of at least one set in one layer angularly intersect threads of at least one set in the other layer, each angle of intersection being an angle other than a 90°

angle.