CA1121846A - Lifting sling, in the shape of a mat, particularly for lifting cylindrical objects - Google Patents
Lifting sling, in the shape of a mat, particularly for lifting cylindrical objectsInfo
- Publication number
- CA1121846A CA1121846A CA000350454A CA350454A CA1121846A CA 1121846 A CA1121846 A CA 1121846A CA 000350454 A CA000350454 A CA 000350454A CA 350454 A CA350454 A CA 350454A CA 1121846 A CA1121846 A CA 1121846A
- Authority
- CA
- Canada
- Prior art keywords
- lifting
- sling
- slings
- mat
- wrapping
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/12—Slings comprising chains, wires, ropes, or bands; Nets
- B66C1/18—Band-type slings
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/18—Grommets
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2083—Jackets or coverings
- D07B2201/2091—Jackets or coverings being movable relative to the internal structure
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2501/00—Application field
- D07B2501/20—Application field related to ropes or cables
- D07B2501/2015—Construction industries
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Load-Engaging Elements For Cranes (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A lifting sling in the shape of a mat, particularly designed to lift large cylindrical objects. The lifting mat comprises a number of slings which are positioned side by side, each one of said slings consisting of an elongate loop of parallel strands. Each sling extends inside its individual channel, which channels are formed by a wrapping enclosing the slings.
A portion of each sling protrudes from its channel at each channel end. These protruding sling portions are individually enclosed by protective coverings and from lifting loops.
The lifting mat in accordance with the invention is less expensive to manufacture than prior-art lifting mats while at the same time they are more wear-resistant and easier to handle.
A lifting sling in the shape of a mat, particularly designed to lift large cylindrical objects. The lifting mat comprises a number of slings which are positioned side by side, each one of said slings consisting of an elongate loop of parallel strands. Each sling extends inside its individual channel, which channels are formed by a wrapping enclosing the slings.
A portion of each sling protrudes from its channel at each channel end. These protruding sling portions are individually enclosed by protective coverings and from lifting loops.
The lifting mat in accordance with the invention is less expensive to manufacture than prior-art lifting mats while at the same time they are more wear-resistant and easier to handle.
Description
~ACKG~OUND OF THE I~V~N'~ION
The subject invention concerns a li~ting sling in the form of a rnat which is particularly designed to lift cylindrical objects, such as pipes or rollers.
~ifting mats of this kind are used when it is desirable to distribute the lifting stress overa large area of engagement to avoid deformation of the lifted object. At the same time lifting with the aid of a mat improves the balance of the lifted object æupported in the li~ting mat compared with when conventional roundslings or web straps are used.
When large cylindrical objects are being lifted, it is therefore common practice to use lifting mats consisting of two or several woven and comparatively thin fibrous webs which are positioned side by side. At their ends, the woven fibrous webs are interconnected by means of a lifting element, so as to form a lifting mat.
When lifting means of this kind are used, e.g. when drainage pipes or pipelines are deposited in the ground, the fibrous straps, and quite particularly the load-carrying warp threads therein, are exposed to extreme wear owing to their direct contact with the lifted objects as well as with earth, gravel and water. In addition, lifting means of this type are difficult to handle when the web ends are to be connected to the end lifting elements, ,~
since sorne kind of locking arral~ement is necessary.
SUI,~fAR~ Ol~' T~IE SUl~J[~.C'Il I~VEN'~ION
'~he subject invention provides a lifting mat which possesses a higher lifting capacity than conventional lifting means of comparable weight, and which is more simple to handle and more resistant to wear than are prior-ar-t lifting mats. In add:ition, the lifting mat in accordance with the invention does not require locking means to attach the lifting mat to a lifting element.
'lhe lifting mat in accordance with the invention is also cheaper to manufacture than are lifting mats of conventional design which consist of woven fibrous straps the ends of which must be attached to the strap to form lifting loops. '~he requirements on strength on such joints are considerable and they are therefore often provided with reinforcement means.
'rhe lifting mat ln accordance with the invention is characterised in that it is composed of two or several slings which are positioned side by side, each such sling consisting of an elongate loop of parallel threads and extending inside its individual channel, which channels are formed by a wrapping enclosing the slings, a portion of each sling protroding from its respective channel at each channel end, said protroding portions being individually enclosed by protective coverings and forming 1f346 lif-ting loops.
BRIEF DES~RIPTION OF T~-L~ D~ WLNGS
The invention will be described in closer detail in the following with reference to the accompanying drawings on which are represented several embodiments of the inventive object. In -the drawings, Fig, 1 shows the lifting mat in accordance with the invention while in use, Fig. 2 is an end view of the lifting mat together with its lifting element, Fig, 3 shows the lifting mat in extended position in a broken perspective view, Fig. 4 illustrates a liftingloop on an enlarged scale and Fig. 5 and 6 show a part of the lifting mat in accordance with two different embodiments thereof.
DETAI~ED DESCRIPTION OP A PREFE~RED E~ODIMENT
The lifting device illustrated in Fig. 1 consists of a lifting element 1 and a lifting mat 2 laid around a tube 3.
The lifting element 1 is suspended from the lifting hook 4 of a hoisting crane and is in the form of a flat iron 5 which is fitted on each side with a number of hooks 6. The ends of the lifting mat 2 are provided with loops 7, the number of which corresponds to the number of hooks 6, Fig. 2 illustrates the lifting hooks 6 of the lifting element 1 more clearly. As appears from this drawing figure, the hool~s 6' on one side are formed with a wider opening or loop-receiving aperture than are the hooks on the opposite side. r~his is done in order to facilitate hooking-on and hookin-off of the lifting loops 7 at one end of the lifting mat while at the same time this arrangement ensures that the lifting loops at the oppo~ite end of the mat are securely retained in position in the hooks when the lifting mat is applied around or is removed from the object to be lifted.
~he lifting mat 2 illustrated in Fig 3 i8 provided with a wrapping which is in the form of a doubled cloth 8 made from a water-repellant and wear-resistant material, preferably polyester of nylon-reinforced PVC plastics. ~he lengthwise marginal edges of the cloth are interconnected, preferably at the centre of the lifting mat, by means of a seam, which could be made either by welding or sewing or be some other suitable type of seam.
Elongate slings 9 made from parallel strands of synthetic fibre yarns are sandwiched between the walls of the cloth 8 in such a manner that a portion of each ~ling projects beyond the transverse marginal edges of the cloth, thus forming the lifting loops 7.
Lengthwise seams 10, formed by e.g, welding or sewing, interconnect the walls of the cloth 8, whereby channels 11 are formed which separate the individual slings 9 from 184~;
each o-ther. ~ach lifting loop 7 is provided with its individual protective covering 12 which i9 made from a woven synthetic-fibre cloth and i8 provided with a leather lining 13 in the areas of the ]oop intended to engage with the hooks 6.
Fig. 5 illustrates a second embodiment of the sling in accordance with the invention, according to which the wrapping consists of a number of hoses 14 forming the channels 11 of the wrapping. ~engthwise seams 15 interconnect the hoses in parallel relationship. As in the first embodiment, the slings extend lengthwise inside the channels 11 in such a manner that their ends protrude beyond the channels, forming the lifting loops 7 at the channel ends.
~he third embodiment illustrated in Fig. 6 is distinguished from the previous embodiment only in that the hoses 14 are interconnected by means of straps 16 extending lengthwise intermediate neighbouring hoses, ~his embodiment makes it possible to manufacture lifting mats with identical lifting capacity but of different ~idths.
Because the synthetic-fibre yarns making up the slings 9 are able to move freely inside the channels 11, the load is distributed more e~enly over the fibres, with the result that the lifting mat as a whole is able to take heavier load in relation to its weight than do wo~en lifting mats 11~1846 of equivalent wei~!~t. `i~ereas loops of conventional fibrous webs extend in a line of engagernent which is parallel to the plane of the lifting mat and therefore require the use of special melnbers or locking means to attach the lifting loops to the lifting element, this i~ not necessary in the lifting mat in accordance with the subject invention. On the contrary, the lifting loops 7 on the mat may be hooked directly onto the hooks 6 formed on the lifting element 1.
Because the wrapping encloses the strands forming the slings, the latter are protected from wear and from the detrimental effects of dirt and water. Worn-out patches of the wrapping are easily mended which can be done without impairing the strength of the lifting mat, Fig, 6 shows the slings 9 fitted with a protective covering 12 that eætends along the entire length of each sling. This arrangement gives the lifting mat additional wear resistance. Obviou~ly, the slings 9 illustrated in ~igs 3 and 5 could be similarly fitted with protective coverings of this kind.
The invention is not limited to the embodiments illustrated and described above but a number of modifications are possible within the scope of the appended claims. '~he lengthwise seams 10 need not extend along the entire length of the wrapping. The essential feature is that the slings 9 are kept separated from each other.
ll;~lB46 The invention is not either limited to be used in connection with tubes or rollers but could be u~ed also to li~t other objects, e.g. bulk commodity packages, such as sack loads.
The subject invention concerns a li~ting sling in the form of a rnat which is particularly designed to lift cylindrical objects, such as pipes or rollers.
~ifting mats of this kind are used when it is desirable to distribute the lifting stress overa large area of engagement to avoid deformation of the lifted object. At the same time lifting with the aid of a mat improves the balance of the lifted object æupported in the li~ting mat compared with when conventional roundslings or web straps are used.
When large cylindrical objects are being lifted, it is therefore common practice to use lifting mats consisting of two or several woven and comparatively thin fibrous webs which are positioned side by side. At their ends, the woven fibrous webs are interconnected by means of a lifting element, so as to form a lifting mat.
When lifting means of this kind are used, e.g. when drainage pipes or pipelines are deposited in the ground, the fibrous straps, and quite particularly the load-carrying warp threads therein, are exposed to extreme wear owing to their direct contact with the lifted objects as well as with earth, gravel and water. In addition, lifting means of this type are difficult to handle when the web ends are to be connected to the end lifting elements, ,~
since sorne kind of locking arral~ement is necessary.
SUI,~fAR~ Ol~' T~IE SUl~J[~.C'Il I~VEN'~ION
'~he subject invention provides a lifting mat which possesses a higher lifting capacity than conventional lifting means of comparable weight, and which is more simple to handle and more resistant to wear than are prior-ar-t lifting mats. In add:ition, the lifting mat in accordance with the invention does not require locking means to attach the lifting mat to a lifting element.
'lhe lifting mat in accordance with the invention is also cheaper to manufacture than are lifting mats of conventional design which consist of woven fibrous straps the ends of which must be attached to the strap to form lifting loops. '~he requirements on strength on such joints are considerable and they are therefore often provided with reinforcement means.
'rhe lifting mat ln accordance with the invention is characterised in that it is composed of two or several slings which are positioned side by side, each such sling consisting of an elongate loop of parallel threads and extending inside its individual channel, which channels are formed by a wrapping enclosing the slings, a portion of each sling protroding from its respective channel at each channel end, said protroding portions being individually enclosed by protective coverings and forming 1f346 lif-ting loops.
BRIEF DES~RIPTION OF T~-L~ D~ WLNGS
The invention will be described in closer detail in the following with reference to the accompanying drawings on which are represented several embodiments of the inventive object. In -the drawings, Fig, 1 shows the lifting mat in accordance with the invention while in use, Fig. 2 is an end view of the lifting mat together with its lifting element, Fig, 3 shows the lifting mat in extended position in a broken perspective view, Fig. 4 illustrates a liftingloop on an enlarged scale and Fig. 5 and 6 show a part of the lifting mat in accordance with two different embodiments thereof.
DETAI~ED DESCRIPTION OP A PREFE~RED E~ODIMENT
The lifting device illustrated in Fig. 1 consists of a lifting element 1 and a lifting mat 2 laid around a tube 3.
The lifting element 1 is suspended from the lifting hook 4 of a hoisting crane and is in the form of a flat iron 5 which is fitted on each side with a number of hooks 6. The ends of the lifting mat 2 are provided with loops 7, the number of which corresponds to the number of hooks 6, Fig. 2 illustrates the lifting hooks 6 of the lifting element 1 more clearly. As appears from this drawing figure, the hool~s 6' on one side are formed with a wider opening or loop-receiving aperture than are the hooks on the opposite side. r~his is done in order to facilitate hooking-on and hookin-off of the lifting loops 7 at one end of the lifting mat while at the same time this arrangement ensures that the lifting loops at the oppo~ite end of the mat are securely retained in position in the hooks when the lifting mat is applied around or is removed from the object to be lifted.
~he lifting mat 2 illustrated in Fig 3 i8 provided with a wrapping which is in the form of a doubled cloth 8 made from a water-repellant and wear-resistant material, preferably polyester of nylon-reinforced PVC plastics. ~he lengthwise marginal edges of the cloth are interconnected, preferably at the centre of the lifting mat, by means of a seam, which could be made either by welding or sewing or be some other suitable type of seam.
Elongate slings 9 made from parallel strands of synthetic fibre yarns are sandwiched between the walls of the cloth 8 in such a manner that a portion of each ~ling projects beyond the transverse marginal edges of the cloth, thus forming the lifting loops 7.
Lengthwise seams 10, formed by e.g, welding or sewing, interconnect the walls of the cloth 8, whereby channels 11 are formed which separate the individual slings 9 from 184~;
each o-ther. ~ach lifting loop 7 is provided with its individual protective covering 12 which i9 made from a woven synthetic-fibre cloth and i8 provided with a leather lining 13 in the areas of the ]oop intended to engage with the hooks 6.
Fig. 5 illustrates a second embodiment of the sling in accordance with the invention, according to which the wrapping consists of a number of hoses 14 forming the channels 11 of the wrapping. ~engthwise seams 15 interconnect the hoses in parallel relationship. As in the first embodiment, the slings extend lengthwise inside the channels 11 in such a manner that their ends protrude beyond the channels, forming the lifting loops 7 at the channel ends.
~he third embodiment illustrated in Fig. 6 is distinguished from the previous embodiment only in that the hoses 14 are interconnected by means of straps 16 extending lengthwise intermediate neighbouring hoses, ~his embodiment makes it possible to manufacture lifting mats with identical lifting capacity but of different ~idths.
Because the synthetic-fibre yarns making up the slings 9 are able to move freely inside the channels 11, the load is distributed more e~enly over the fibres, with the result that the lifting mat as a whole is able to take heavier load in relation to its weight than do wo~en lifting mats 11~1846 of equivalent wei~!~t. `i~ereas loops of conventional fibrous webs extend in a line of engagernent which is parallel to the plane of the lifting mat and therefore require the use of special melnbers or locking means to attach the lifting loops to the lifting element, this i~ not necessary in the lifting mat in accordance with the subject invention. On the contrary, the lifting loops 7 on the mat may be hooked directly onto the hooks 6 formed on the lifting element 1.
Because the wrapping encloses the strands forming the slings, the latter are protected from wear and from the detrimental effects of dirt and water. Worn-out patches of the wrapping are easily mended which can be done without impairing the strength of the lifting mat, Fig, 6 shows the slings 9 fitted with a protective covering 12 that eætends along the entire length of each sling. This arrangement gives the lifting mat additional wear resistance. Obviou~ly, the slings 9 illustrated in ~igs 3 and 5 could be similarly fitted with protective coverings of this kind.
The invention is not limited to the embodiments illustrated and described above but a number of modifications are possible within the scope of the appended claims. '~he lengthwise seams 10 need not extend along the entire length of the wrapping. The essential feature is that the slings 9 are kept separated from each other.
ll;~lB46 The invention is not either limited to be used in connection with tubes or rollers but could be u~ed also to li~t other objects, e.g. bulk commodity packages, such as sack loads.
Claims (6)
1. A lifting sling in the shape of a mat, particularly for lifting cylindrical objects, such as pipes or rollers, comprising a number of slings positioned side by side, each one of said slings consisting of an elongate loop of parallel strands, a number of channels, one for each sling, formed by a wrapping enclosing said slings, said slings extending inside their respective channels, a portion of each sling protruding from its channel at each channel end, and a number of protective coverings, said protruding sling portions being individually enclosed by said protective coverings and forming lifting loops.
2. A lifting mat according to claim 1, wherein said wrapping is a doubled cloth, preferably made from polyester or from nylon-reinforced PVC plastics, the longitudinal marginal edges of said cloth being interconnected, said slings being sandwiched between the walls of said cloth in fixed relative positions.
3. A lifting mat according to claim 1, wherein said wrapping consists of a number of hoses, lengthwise seams interconnecting said hoses in parallel relationship, each hose enclosing one sling extending lengthwise therein.
4, A lifting mat according to claim 3, comprising straps arranged intermediate said hoses so as to serve as hose-interconnecting means.
5. A lifting mat according to claim 1, wherein said protective coverings extend along the entire length of said slings.
6. A lifting mat according to claim 1, wherein a lining is arranged on said sling portions serving as lifting loops, said lining arranged on the face of the coverings turned towards said wrapping, said lining made from a comparatively rigid and wear-resistant material, such as leather.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7903793-3 | 1979-04-30 | ||
| SE7903793 | 1979-04-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1121846A true CA1121846A (en) | 1982-04-13 |
Family
ID=20337942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000350454A Expired CA1121846A (en) | 1979-04-30 | 1980-04-23 | Lifting sling, in the shape of a mat, particularly for lifting cylindrical objects |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1121846A (en) |
| GB (1) | GB2050998A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105645250A (en) * | 2016-02-26 | 2016-06-08 | 德清申力索具有限公司 | Annular sling |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GR73539B (en) * | 1980-01-21 | 1984-03-12 | Spanset Inter Ag | |
| US6039376A (en) * | 1997-11-25 | 2000-03-21 | Lopreiato; Mark Anthony | Forearm furniture leverage straps |
| DE10100993C2 (en) * | 2001-01-10 | 2003-04-10 | Spanset Inter Ag Oetwil Am See | Device for adjusting the length of an endless sling and device for lifting loads |
| US7731069B2 (en) | 2006-10-10 | 2010-06-08 | Mark A. Lopreiato | Enhanced forearm furniture leverage straps |
| AT515335A1 (en) | 2014-01-30 | 2015-08-15 | Teufelberger Fiber Rope Gmbh | rope composite |
-
1980
- 1980-04-23 GB GB8013338A patent/GB2050998A/en not_active Withdrawn
- 1980-04-23 CA CA000350454A patent/CA1121846A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105645250A (en) * | 2016-02-26 | 2016-06-08 | 德清申力索具有限公司 | Annular sling |
| CN105645250B (en) * | 2016-02-26 | 2017-05-17 | 德清申力索具有限公司 | Annular sling |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2050998A (en) | 1981-01-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1153037A (en) | Round sling as well as a strop formed therefrom or a round sling mat formed therefrom | |
| US4856837A (en) | Reinforced cargo sling and method | |
| CA1060065A (en) | Self-cinching cargo sling | |
| US6331024B1 (en) | Lifting sling system with spaced, bi-directional loops | |
| US5688011A (en) | Lifting sling system having single strap with size-varying, spaced, in-line eye loops | |
| US4834439A (en) | Load lifting sling and textile webbing for producing the sling | |
| US5727833A (en) | Eye-and-eye sling | |
| US4025100A (en) | Synthetic fiber sling construction | |
| GB1591091A (en) | Containers | |
| CA1121846A (en) | Lifting sling, in the shape of a mat, particularly for lifting cylindrical objects | |
| US5419951A (en) | Cut and abrasion resistant webbing and multifilament bicomponent yarn used in the manufacturing thereof | |
| CN1034409C (en) | Reinforced textile sling band | |
| JPH0318082U (en) | ||
| US3425737A (en) | Pipe sling | |
| US3466080A (en) | Fabric load lifting sling and similar flexible tension member having increased ability to withstand shock loads | |
| US3622025A (en) | Mobile boat-handling apparatus | |
| NO135464B (en) | ||
| JP2630996B2 (en) | Civil engineering net | |
| US4159840A (en) | Load-carrying net for suspension externally of aircraft such as helicopters | |
| US3992048A (en) | Belt chain sling | |
| US3840262A (en) | Pipe sling | |
| JP3165294B2 (en) | High load belt sling | |
| NO140921B (en) | ENDLOES LOEFTESTROPP. | |
| US6000498A (en) | Safety/debris net system | |
| FI58316B (en) | BAERREM FOER LYFTANORDNING |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |