CA1036324A - Rope clamp - Google Patents
Rope clampInfo
- Publication number
- CA1036324A CA1036324A CA211,618A CA211618A CA1036324A CA 1036324 A CA1036324 A CA 1036324A CA 211618 A CA211618 A CA 211618A CA 1036324 A CA1036324 A CA 1036324A
- Authority
- CA
- Canada
- Prior art keywords
- sleeve
- rope
- wall thickness
- clamp
- mid
- 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
Landscapes
- Ropes Or Cables (AREA)
- Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention provides a rope clamp comprising a sleeve of plastic malleable material arranged to be firmly pressed around one or more rope parts, the improvement wherein the sleeve is provided with an axial center hole having sub-stantially the same cross-section over the entire sleeve length and with a wall thickness which is thinnest at the mid-portion of the sleeve and thickest at the end portions of the sleeve said wall thickness varying continuously over the whole length of the sleeve increasing from the mid-portion to each of the end portions of the sleeve in a substantially uniform and progressive manner, and, whereby a substantially uniform pressure is applied to each rope part when the sleeve is pressed firmly around it.
The present invention provides a rope clamp comprising a sleeve of plastic malleable material arranged to be firmly pressed around one or more rope parts, the improvement wherein the sleeve is provided with an axial center hole having sub-stantially the same cross-section over the entire sleeve length and with a wall thickness which is thinnest at the mid-portion of the sleeve and thickest at the end portions of the sleeve said wall thickness varying continuously over the whole length of the sleeve increasing from the mid-portion to each of the end portions of the sleeve in a substantially uniform and progressive manner, and, whereby a substantially uniform pressure is applied to each rope part when the sleeve is pressed firmly around it.
Description
Rop~3 ~ la~ ~o36324 C~ This invention concerns a rope clamp in shape of a -sleeve or a ferrule with a sleeve-shaped part of plastic malleable material, which sleeve or sleeve part is made to be pressed firmly around one or several rope parts. Rope clamps of such kind are applied to ropes in several manners. For instance the connection can be made by pressing of the whole sleeve length simultaneously or by pressing in sections or by rolling longitudinally of the sleeve. The pressing can be made with one or several rope parts inserted in the sleeve and independently if the sleeve consists of the sleeve part, which at one end turns into a fork, tap or some other part. The method of pressing sleeves on to ropes sectionwise is time-wasting and complicated. It requires in addition to this the utmost exactitude to obtain a good result. The application by rolling has disadvantages as the sleeve easily gets banana-shaped with the consequence that the solidity of the rope connection is reduced at straight load by this shape.
The pressing of a cylindrical sleeve or sleeve-shaped part around a rope simultaneously in one stage over the whole sleeve length is also connected with disadvantages.
When pressing the sleeve together there is an accumulation of excess in the middle zone of the sleeve while there is no such accumulation at the sleeve ends as the material there has the possibility to flow in the axial ~ -~
direction. The rope part or the rope parts therefore are subject to the highest compression strain in the middle zone of the rope sleeve and to a lesser extent at the end parts of the sleeve. This means that there is an undesirable irregular pressure distribution in the rope clamp. The longer the sleeve or the sleeve-shaped part is, which is to be pressed in one stage, the more difference there will be between the pressure r~
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strain in the mentioned middle zone and the end parts of the sleeve, When usin~ ferrules for only one rope part in contrary to what is the case when making a loop, the load is transferred entirely from the rope to the clamp as the rope is inserted only at one end of the ferrule. In such a case the sleeve-sha~ed part has to be extremely long especially if the rope exists of thin wires on the surface. This makes the above mentioned problem with different flows of the material in different parts of the sleeve part during the compression and consequently the irregular pressure distribution in the rope clamp especially obvious, ~ :
Accordingly, the present invention provides a rope clamp comprising a sleeve of plastic malleable material arranged to be firmly pressed around one or more rope parts, the improve-ment wherein the sleeve is provided with an axial center hole having substantially the same cross-section over the entire sleeve length and with a wall thickness which is thinnest at the mid-portion of the sleeve and thickest at the end portions of the sleeve said wall thickness varying continuously over the whole length of the sleeve increasing from the mid-portion to each of the end portions of the sleeve in a substantially uniform I and progressive manner, and, whereby a substantially uniform pressure is applied to each rope part when the sleeve is pressed firmly around it, ~ .
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In one embodiment the wall thickness of the sleeve or sleeve part increases continuously from the middle towards the ends. In another embodiment the wall thickness of the sleeve or sleeve part increases step by step from the middle towards -the ends.
The present invention will be further illustrated by way of the accompanying drawings of which:
Fig. 1 is a side-view of a sleeve according to one embodiment of the present invention.
Fig. 2 is an end-view of the sleeve of Fig. 1;
Fig. 3 a cross-section along the lines III-III of Fig. l;
Fig. 4 shows the sleeve of Fig. 1 applied as a rope clamp with a loop before compression;
Fig. 5 the rope clamp of Fig. 4 after compression;
Fig. 6 is a side-view of a sleeve according to another embodiment of the present invention;
Fig. 7 is a side-view of a ferrule with a sleeve part in accordance with one embodiment of the present invention;
Fig. 8 is an end-view of the ferrule of Fig. 7 and Fig. 9 a cross-section along the lines IX-IX of Fig. 7.
Referring to Figs. 1 to 3, there is shown a sleeve 1 for rope clamps of plastic malleable material, which has an -axial centre hole 2 with oval cross-section for accommodating two adjacent rope parts. The centre hole 2 has the same cross- ,-sectional dimensions over the whole sleeve length. The jacket surface 3 of the sleeve 1 is concave, the wall of the sleeve being thinnest at the middle part 4 of the sleeve and thickest at the end parts 5. This embodiment of the present invention has a lot of advantages when applying the sleeve as a rope clamp.
For example a loop as per Fig. 4 has been chosen where the oval sleeve 1 has been mounted over two rope parts 6 and 7 for making
The pressing of a cylindrical sleeve or sleeve-shaped part around a rope simultaneously in one stage over the whole sleeve length is also connected with disadvantages.
When pressing the sleeve together there is an accumulation of excess in the middle zone of the sleeve while there is no such accumulation at the sleeve ends as the material there has the possibility to flow in the axial ~ -~
direction. The rope part or the rope parts therefore are subject to the highest compression strain in the middle zone of the rope sleeve and to a lesser extent at the end parts of the sleeve. This means that there is an undesirable irregular pressure distribution in the rope clamp. The longer the sleeve or the sleeve-shaped part is, which is to be pressed in one stage, the more difference there will be between the pressure r~
: -~ " ,; ~ ' ":
strain in the mentioned middle zone and the end parts of the sleeve, When usin~ ferrules for only one rope part in contrary to what is the case when making a loop, the load is transferred entirely from the rope to the clamp as the rope is inserted only at one end of the ferrule. In such a case the sleeve-sha~ed part has to be extremely long especially if the rope exists of thin wires on the surface. This makes the above mentioned problem with different flows of the material in different parts of the sleeve part during the compression and consequently the irregular pressure distribution in the rope clamp especially obvious, ~ :
Accordingly, the present invention provides a rope clamp comprising a sleeve of plastic malleable material arranged to be firmly pressed around one or more rope parts, the improve-ment wherein the sleeve is provided with an axial center hole having substantially the same cross-section over the entire sleeve length and with a wall thickness which is thinnest at the mid-portion of the sleeve and thickest at the end portions of the sleeve said wall thickness varying continuously over the whole length of the sleeve increasing from the mid-portion to each of the end portions of the sleeve in a substantially uniform I and progressive manner, and, whereby a substantially uniform pressure is applied to each rope part when the sleeve is pressed firmly around it, ~ .
' - ' :
.~ .
. . ,, . ~ ,, :; . . -. ., '~ ' :
~0363Z4 ~ ~ ;
In one embodiment the wall thickness of the sleeve or sleeve part increases continuously from the middle towards the ends. In another embodiment the wall thickness of the sleeve or sleeve part increases step by step from the middle towards -the ends.
The present invention will be further illustrated by way of the accompanying drawings of which:
Fig. 1 is a side-view of a sleeve according to one embodiment of the present invention.
Fig. 2 is an end-view of the sleeve of Fig. 1;
Fig. 3 a cross-section along the lines III-III of Fig. l;
Fig. 4 shows the sleeve of Fig. 1 applied as a rope clamp with a loop before compression;
Fig. 5 the rope clamp of Fig. 4 after compression;
Fig. 6 is a side-view of a sleeve according to another embodiment of the present invention;
Fig. 7 is a side-view of a ferrule with a sleeve part in accordance with one embodiment of the present invention;
Fig. 8 is an end-view of the ferrule of Fig. 7 and Fig. 9 a cross-section along the lines IX-IX of Fig. 7.
Referring to Figs. 1 to 3, there is shown a sleeve 1 for rope clamps of plastic malleable material, which has an -axial centre hole 2 with oval cross-section for accommodating two adjacent rope parts. The centre hole 2 has the same cross- ,-sectional dimensions over the whole sleeve length. The jacket surface 3 of the sleeve 1 is concave, the wall of the sleeve being thinnest at the middle part 4 of the sleeve and thickest at the end parts 5. This embodiment of the present invention has a lot of advantages when applying the sleeve as a rope clamp.
For example a loop as per Fig. 4 has been chosen where the oval sleeve 1 has been mounted over two rope parts 6 and 7 for making
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,~ ~ . .
the loop 8. When compressing the sleeve 1 with a set of jaws around the rope parts 6 and 7 the material of the sleeve will flow in both axial and radial direction as described above.
. . . ~ .
Due to the design of the sleeve 1 with the largest wall ~ -thickness at the end parts 5 however there will be no exceptional high pressure in the middle zone 4. On the contrary after compression an even pressure will result along the whole length of the sleeve 1 and because of the material flow the sleeve will assume a more or less cylindrical shape as per Fig. 5. In Fig. 6 there is shown an embodiment where the jacket surface 10 of the sleeve 9 has a step-like configuration to achieve the largest wall thickness at the end parts 11 of the sleeve 9. With this design the desirable result will also be achieved during compression. In Fig. 7 there is shown a ferrule 12 with a sleeve-shaped part 13 which according to the present invention is formed with the smallest wall thickness ~ -at the middle part 14 and the largest wall thickness at its end parts lS. This rope clamp ha9 a circular centre hole 16 to take up only one rope part. Due to this the sleeve-shaped part 13 is proportionately long to be able to take up ;
existing strains applied on the rope clamp. ~ -In this embodiment, the aim of the invention becomes still more obvious with regard to the achieving of an even pressure on the rope part along the whole length of the sleeve part 13. The invention naturally also can be used for other typesof rope clamps or ferrules.
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the loop 8. When compressing the sleeve 1 with a set of jaws around the rope parts 6 and 7 the material of the sleeve will flow in both axial and radial direction as described above.
. . . ~ .
Due to the design of the sleeve 1 with the largest wall ~ -thickness at the end parts 5 however there will be no exceptional high pressure in the middle zone 4. On the contrary after compression an even pressure will result along the whole length of the sleeve 1 and because of the material flow the sleeve will assume a more or less cylindrical shape as per Fig. 5. In Fig. 6 there is shown an embodiment where the jacket surface 10 of the sleeve 9 has a step-like configuration to achieve the largest wall thickness at the end parts 11 of the sleeve 9. With this design the desirable result will also be achieved during compression. In Fig. 7 there is shown a ferrule 12 with a sleeve-shaped part 13 which according to the present invention is formed with the smallest wall thickness ~ -at the middle part 14 and the largest wall thickness at its end parts lS. This rope clamp ha9 a circular centre hole 16 to take up only one rope part. Due to this the sleeve-shaped part 13 is proportionately long to be able to take up ;
existing strains applied on the rope clamp. ~ -In this embodiment, the aim of the invention becomes still more obvious with regard to the achieving of an even pressure on the rope part along the whole length of the sleeve part 13. The invention naturally also can be used for other typesof rope clamps or ferrules.
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Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A rope clamp comprising a sleeve of plastic malleable material arranged to be firmly pressed around one or more rope parts, the improvement wherein the sleeve is provided with an axial center hole having substantially the same cross-section over the entire sleeve length and with a wall thickness which is thinnest at the mid-portion of the sleeve and thickest at the end portions of the sleeve said wall thickness varying continuously over the whole length of the sleeve in a substantially uniform and progressive manner and increasing from the mid-portion to each of the end portions of the sleeve, whereby a sub-stantially uniform pressure is applied to each rope part when the sleeve is pressed firmly around it.
2. A clamp as claimed in claim 1, in which the wall thickness of the sleeve increases stepwise from the middle towards the ends thereof.
3. A clamp as claimed in claim 1 or 2, including a ferrule attached to one end of said sleeve.
4. A clamp as claimed in claim 1, in which the wall thickness of the sleeve increases smoothly from the middle towards the ends thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA211,618A CA1036324A (en) | 1974-10-17 | 1974-10-17 | Rope clamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA211,618A CA1036324A (en) | 1974-10-17 | 1974-10-17 | Rope clamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1036324A true CA1036324A (en) | 1978-08-15 |
Family
ID=4101385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA211,618A Expired CA1036324A (en) | 1974-10-17 | 1974-10-17 | Rope clamp |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1036324A (en) |
-
1974
- 1974-10-17 CA CA211,618A patent/CA1036324A/en not_active Expired
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