Load lifting sling and textile webbing for producing the sling
AssigneeSpanset Inter AG
InventorDieter van de Kamp
Life of this patent
Estimating the term…
Abstract
A strap for the production of load lifting slings equipped with lifting loops and tie loops arranged parallel thereto is composed of a webbing fabric. In a width region arranged at a distance from both side edges of the strap, in which a cut is to be made in the longitudinal direction of the webbing through the transverse bond, the warp yarns of the webbing fabric are formed of textile yarns (meltable yarns) of a synthetic material whose melting temperature is lower than the melting temperature of the warp yarns in at least the width region of the strap forming the lifting loop. The cut to produce the tie loop is made by a hot cut under the influence of heat in such a manner that only the meltable yarns melt.
Claims13
In a load carrying lifting sling made of a high tensile strength strap composed of textile yarns which lie next to one another in approximately the same plane in the longitudinal direction of the strap, which are held together in their juxtaposed position, and which are made, in particular, of synthetic materials;
- and wherein said lifting sling is provided with lifting loops for attachment of a lifting device and tie loops for fixing the load to be lifted, with each lifting loop lying next to a respective tie loop and being separated from one another by division of the textile yarns into two parallel strands of strap by respective slit extending in the longitudinal direction of the strap;
- the improvement wherein:
- (a) the strap is made of a webbing fabric and the textile yarns extending in the longitudinal direction of the strap are warp yarns of the webbing fabric;
- (b) in a certain cut width region of the webbing arranged at a distance from the two side edges of the webbing, the warp yarns of the webbing fabric are formed by meltable textile yarns made of a synthetic material whose melting temperature is lower than the melting temperature of the warp yarns of at least the width region of the webbing which forms the lifting loop in the region of the slit;
- and
- (c) each slit between a lifting loop and a respective tie loop, is a longitudinal cut, made in the lingitudinal direction of the webbing, in a respective portion of said cut width region in which the low temperature melting point warp yarns have been removed by melting under the influence of heat.
A load carrying lifting sling comprising:
- a high tensile strength textile webbing of a synthetic material having a length in a longitudinal direction and a width in a transverse direction, and including
- a plurality of warp yarns arranged in the longitudinal direction of said webbing with the warp yarns disposed in a portion of the width of said webbing which is spaced from both respective side edges of said webbing being made of a material having a melting point which is lower than the melting point of the material of the remaonder of said warp yarns, and
- a plurality of woof yarns disposed in the transverse direction of said webbing and woven into said plurality of warp yarns;
- and
- means connecting the ends of the length of said webbing together;
- and a plurality of longitudinal slots formed in respective sections of said portion of the width of said webbing wherein said lower melting point warp yarns have been removed by melting to provide a respective plurality of lifting and tie loops for said sling.
A method of making a load carrying lifting sling made of a high tensile strength, comprising the steps of:
- providing a textile webbing of a synthetic material having a length in a longitudinal direction and a width in a transverse direction, and having:
- a plurality of warp yarns arranged in the longitudinal direction of said webbing, with the warp yarns disposed in a portion of the width of said webbing which is spaced from both respective side edges of said webbing being made of a material having a melting point which is lower than the melting point of the material of the remainder of said warp yaarns, and
- a plurality of woof yarns disposed in the transverse direction of said webbing and woven into said plurality of warp yarns;
- producing a plurality of slots in the longitudinal direction of said webbing in desired sections of said portion of the width of said webbing by a longitudinal cut while applying heat in a manner to melt only the warp yarns in said section of said portion of the width and not the adjacent higher temperature melting point yarns to form a plurality of lifting loops and a plurality of adjacent tie loops;
- and
- attaching the ends of the length of the webbing together to form the load carrying lifting sling.
Dependencies are inferred from the claim text.