CA1162388A - Hose clamp - Google Patents
Hose clampInfo
- Publication number
- CA1162388A CA1162388A CA000352183A CA352183A CA1162388A CA 1162388 A CA1162388 A CA 1162388A CA 000352183 A CA000352183 A CA 000352183A CA 352183 A CA352183 A CA 352183A CA 1162388 A CA1162388 A CA 1162388A
- Authority
- CA
- Canada
- Prior art keywords
- hose
- clamp
- ridges
- clamp assembly
- assembly according
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses
- F16L33/22—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses with means not mentioned in the preceding groups for gripping the hose between inner and outer parts
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Joints That Cut Off Fluids, And Hose Joints (AREA)
Abstract
ABSTRACT
A hose clamp assembly comprising hose clamp means comprising at least three clamp segments, a coupling sleeve to extend within the bore of a hose and means for securing said clamp segments together round the coupling sleeve to form a clamp assembly. Each of the segments has its respective inwardly facing clamping surface for contacting the hose. The clamping surfaces are each provided with a series of inwardly facing ridges spaced longitudinally of one another, said ridges extending round the circumference of the clamp assembly. The coupling sleeve having an outwardly facing clamping surface for contacting the hose, the clamping surface being provided with at least two grooves extending round the circumference of the coupling sleeve. The grooves are spaced longitudinally of one another for alignment with the inwardly facing ridges on the annular clamp.
A hose clamp assembly comprising hose clamp means comprising at least three clamp segments, a coupling sleeve to extend within the bore of a hose and means for securing said clamp segments together round the coupling sleeve to form a clamp assembly. Each of the segments has its respective inwardly facing clamping surface for contacting the hose. The clamping surfaces are each provided with a series of inwardly facing ridges spaced longitudinally of one another, said ridges extending round the circumference of the clamp assembly. The coupling sleeve having an outwardly facing clamping surface for contacting the hose, the clamping surface being provided with at least two grooves extending round the circumference of the coupling sleeve. The grooves are spaced longitudinally of one another for alignment with the inwardly facing ridges on the annular clamp.
Description
IMPROVEMENTS IN AND RELATING TO HO~E
This invention relates to hose and in particular, though not exclusively, to clamp means suitable for securing a hose, such as a fire-fighting hose, to a hose coupling.
To secure together two lengths of hose or to connect a hose to fixed pipework use is made commonly of coupling components of the kind having sleeve portions which extend into the bore of the hose and co-operate with clamp means provided around the hose which thereby is gripped between the coupling sleeve and clamp means.
One known type of clamp means comprises a pair of semi-circular shaped clamp halves which may be tightly bolted together so as to bear firmly against the hose and hold it tightly against the coupling ~leeve. With carefully controlled dimensionc o~ the outer diameter of the sleeve, inner diameter of the clamp halves, and hose wall thickness this arrangement can prove satisfactory.
However, in practice difficulty is experienced in obtaining a sufficiently hi~h degree of production control of the dimensions, and in particular that of the hose wall thickness, which will vary in a manner difficult to predict during the heat treatment of curable material commonly forming part of the hose. In consequence when clamped together the two clamp halves either fail to completely encircle the hose or come into contact without tightly gripping the hose, and in both cases leakage readily occurs.
An alternative type of clamp means which overcomes the disadvantages of the above-described two-part clamp .. ~
1 ~62388 comprises an outer metal tube which extends around the hose and can be swaged to firmly compress the hose against the inner coupling sleeve. Although this form of clamp means is effective in avoiding leaks, it is not convenient for many applications, such as with fire-fighting hose, where the hose is often damaged in use and it is desired to be able easily to re-use the couplings which are relatively expensive.
The present invention seeks to provide hose clamp means which is re-usable and which is capable of firmly clamping a hose in fluid type manner against a coupling sleeve.
According to the present invention hose clamp assembly which comprises hose clamp means comprising at least three clamp segments, a coupling sleeve to extend within the bore of a hose and means for securing said clamp segments together round the coupling sleeve to form a clamp assembly; each of said segments having its respective inwardly facing clamping surface for contacting the hose, said clamping surfaces each being provided with a series of inwardly facing ridges spaced longitudinally of one another, said ridges extending round the circumference of the clamp assembly; said coupling sleeve having an outwardly facing clamping surface for contacting the hose, said clamping surface being provided with at least two grooves extending round the circumference of the coupling sleeve, said grooves being spaced longitudinally of one another for alignment with said inwardly facing ridges on the annular clamp.
¢~
1 1 623~8 ~ 2a.
Preferably, the segments of the clamp have three radially inwardly projecting ridges, and more preferably, the axially outer two of the ridges extend further radially - -inwards than the centre ridge. It is further preferred that the radially inner surface of each ridge is of a frusto-conical shape, the radially innermost portion of the ridge thus having a substantially acute angled or slightly rounded, edge which tends to dig into a hose cover in the use of clamp means.
Preferably, the inner surface of a ridge has a taper angle of between 5 1 1 623~
and 15 relative to the longitudinal direction of the clamp, more preferably 10.
The invention provides also a coupling assembly comprising said clamp means in accordance with the invention and a coupling sleeve, and a hose fitted with one or more of said coupling assemblies. Preferably the outer surface of the coupling sleeve is formed with a pair of longitudinally spaced circumferentially extending grooves in alignment with the end ridges of the clamp segments. Preferably the width of each groove, as considered in the longitudinal direction, is greater than the width of each said end ~idges to provide space to accommodate the wall thickness of the hose.
The grooves in the coupling sleeves co-operate in the assembl0d coupllng with the ridges in the clamp segments to de~ine therebetween a space of substantially ~inusoidal shape as considered in ~ongitudinal cross-section. In combination with the edges (pre~erably acute or slightly rounded) o~ the ridges which dig into the hose cover material, the distorted shape into which the hose is forced when clamped between the segments and sleeve results in its firm retention in a fluid-tight manner.
~ n constructions where the clamp means has more than three ridges the coupling sleeve pre~erably is provided with additional grooves, the position, size and shape thereof ~5 being selected to be complementary to the ridges oP the clamp segment.
One embodiment o~ the invention will now be described, by way of example, with re~erence to the accompanying 1 ~ ~238~
drawing which is a longitudinal sectional view of part of a clamp means in accordance with the present invention in use to secure a hose to a coupling sleeve.
A fire hose 10 comprises a woven reinforcement 11 embedded in vulcanised polyvinyl chloride nitrile rubber 12 which also forms the lining and cover layers of the hose.
An end portion of the hose 10 is shown in situ clamped between a coupling sleeve 13 and one segment of clamp means 14. The coupling sleeve 13 extends from, for example, an annular retention flange (not shown) by means of which the coupling may be secured, for example by bolts, to another coupling or fixed pipework.
The clamp means 14 comprises three identical c~st aluminlum segments, each formed with three ridges 15, 16 and 17. The ridges of the segments form three circum-~erentially extending radially inwardly projecting ridges when the three segments are united around the hose 10.
The innermost sur~aces of the ridges are of a tapered form such that in assembly of the segments the ridges have inner surfaces of frusto-conical shape, with the innermost edge 18 of each ridge being only slightly rounded so as to tend readily to dig into the hose cover material 12. The inner surfaces are tapered at an angle of 10 relative to the longitudinal direction of the coupling assembly.
The axially outer end ridges 15, 17 depend radially inwards from valley surfaces 19 by a distance approximately twice the distance that the centre ridge 16 depends inwards, and said end ridges are longitudinally spaced to align with 5 1 1 623~8 a pair of annular retention grooves 20 in the radially outer surface of the coupling sleeve. The grooves 20 each have a width, considered in the longitudinal direction of the coupling, which is greater than the width of the end ridges 15, 17 such that the grooves 20 and ridges 15, 16 17 define therebetween a space which in cross-section is of a substantially sinusoidal shape.
In use of the clamp segments the segments are positioned such that the edges 18 of each ridge lie nearest the end of the hose, said edges then tending to dig into the hose to restrain movement of the hose through the sinusoidal space between the clamp segments and the coupling sleeve. The diametex of the innermost edge 18 o~ the assembly o~ clamp segments is pre-selected in relatlon to the cross-sectional dimension of a hose, to which it is to be fitted, in such manner that in the final assembly a seal is obtained between the clamp sleeve and segments, and the hose be~ore the neighbouring edges of the successive clamp segments come into contact one with the other.
The edges 18 of the ridges 15, 16, 17 preferably are slightly rounded so as to bite into but not cut the hose.
However for some applications, where it may be pre~erred that the ridges cut into the hose, the edges 18 may be acute angled and relatively sharp.
The clamp segments may be secured together in substantially the same manner as above-described ~or co~Yentional two segment clamps. Thus the clamp segments ~ J ~2388 may be secured by bolts extending therebetween, optionally between flange portions provided in the segment, or the segmen~ may be held together by means of an encircling metal strap.
The clamp segments each have an integral end portion 22 which extends in the same direction as the direction of increasing diameter of the frusto-conical shape surfaces of the ridges. The end portion 22 is tapered, it having an inn~ tapered surface 23 angled in the region 15 to 20 relative to the longitudinal axis of the hose and being intended to provide a gradual transition from the constrained diameter wi$hin the clamp to the free diameter of the hose beyond the clamp when swollen under internal pre~sure, the hose being shown in an inflated condition and bearing against said surface 23. The end portion 22 in addition has an outer tapered surface 24 which is intended to resist snagging when the hose is dragged. The outer surface has a taper angled typically in the range 30 to 35 The provision of clamp means comprising three or more segments is found significantly to reduce the problem of obtaining a fluid-tight seal. By the use of three or more segments instead of two segments dimensional variations in the wall thickness of the hose or dimensions of the clamp means or coupling sleeve are found to have substantially less effect on the ability o~ the clamp means to encircle the hose and hold it firmly in ~luid-tight manner against the inner coupling sleeve. In ~ 1 62388 combination the provision of the clamp means with three ridges provides effective restraint of the hose against axial movement away from the coupling.
This invention relates to hose and in particular, though not exclusively, to clamp means suitable for securing a hose, such as a fire-fighting hose, to a hose coupling.
To secure together two lengths of hose or to connect a hose to fixed pipework use is made commonly of coupling components of the kind having sleeve portions which extend into the bore of the hose and co-operate with clamp means provided around the hose which thereby is gripped between the coupling sleeve and clamp means.
One known type of clamp means comprises a pair of semi-circular shaped clamp halves which may be tightly bolted together so as to bear firmly against the hose and hold it tightly against the coupling ~leeve. With carefully controlled dimensionc o~ the outer diameter of the sleeve, inner diameter of the clamp halves, and hose wall thickness this arrangement can prove satisfactory.
However, in practice difficulty is experienced in obtaining a sufficiently hi~h degree of production control of the dimensions, and in particular that of the hose wall thickness, which will vary in a manner difficult to predict during the heat treatment of curable material commonly forming part of the hose. In consequence when clamped together the two clamp halves either fail to completely encircle the hose or come into contact without tightly gripping the hose, and in both cases leakage readily occurs.
An alternative type of clamp means which overcomes the disadvantages of the above-described two-part clamp .. ~
1 ~62388 comprises an outer metal tube which extends around the hose and can be swaged to firmly compress the hose against the inner coupling sleeve. Although this form of clamp means is effective in avoiding leaks, it is not convenient for many applications, such as with fire-fighting hose, where the hose is often damaged in use and it is desired to be able easily to re-use the couplings which are relatively expensive.
The present invention seeks to provide hose clamp means which is re-usable and which is capable of firmly clamping a hose in fluid type manner against a coupling sleeve.
According to the present invention hose clamp assembly which comprises hose clamp means comprising at least three clamp segments, a coupling sleeve to extend within the bore of a hose and means for securing said clamp segments together round the coupling sleeve to form a clamp assembly; each of said segments having its respective inwardly facing clamping surface for contacting the hose, said clamping surfaces each being provided with a series of inwardly facing ridges spaced longitudinally of one another, said ridges extending round the circumference of the clamp assembly; said coupling sleeve having an outwardly facing clamping surface for contacting the hose, said clamping surface being provided with at least two grooves extending round the circumference of the coupling sleeve, said grooves being spaced longitudinally of one another for alignment with said inwardly facing ridges on the annular clamp.
¢~
1 1 623~8 ~ 2a.
Preferably, the segments of the clamp have three radially inwardly projecting ridges, and more preferably, the axially outer two of the ridges extend further radially - -inwards than the centre ridge. It is further preferred that the radially inner surface of each ridge is of a frusto-conical shape, the radially innermost portion of the ridge thus having a substantially acute angled or slightly rounded, edge which tends to dig into a hose cover in the use of clamp means.
Preferably, the inner surface of a ridge has a taper angle of between 5 1 1 623~
and 15 relative to the longitudinal direction of the clamp, more preferably 10.
The invention provides also a coupling assembly comprising said clamp means in accordance with the invention and a coupling sleeve, and a hose fitted with one or more of said coupling assemblies. Preferably the outer surface of the coupling sleeve is formed with a pair of longitudinally spaced circumferentially extending grooves in alignment with the end ridges of the clamp segments. Preferably the width of each groove, as considered in the longitudinal direction, is greater than the width of each said end ~idges to provide space to accommodate the wall thickness of the hose.
The grooves in the coupling sleeves co-operate in the assembl0d coupllng with the ridges in the clamp segments to de~ine therebetween a space of substantially ~inusoidal shape as considered in ~ongitudinal cross-section. In combination with the edges (pre~erably acute or slightly rounded) o~ the ridges which dig into the hose cover material, the distorted shape into which the hose is forced when clamped between the segments and sleeve results in its firm retention in a fluid-tight manner.
~ n constructions where the clamp means has more than three ridges the coupling sleeve pre~erably is provided with additional grooves, the position, size and shape thereof ~5 being selected to be complementary to the ridges oP the clamp segment.
One embodiment o~ the invention will now be described, by way of example, with re~erence to the accompanying 1 ~ ~238~
drawing which is a longitudinal sectional view of part of a clamp means in accordance with the present invention in use to secure a hose to a coupling sleeve.
A fire hose 10 comprises a woven reinforcement 11 embedded in vulcanised polyvinyl chloride nitrile rubber 12 which also forms the lining and cover layers of the hose.
An end portion of the hose 10 is shown in situ clamped between a coupling sleeve 13 and one segment of clamp means 14. The coupling sleeve 13 extends from, for example, an annular retention flange (not shown) by means of which the coupling may be secured, for example by bolts, to another coupling or fixed pipework.
The clamp means 14 comprises three identical c~st aluminlum segments, each formed with three ridges 15, 16 and 17. The ridges of the segments form three circum-~erentially extending radially inwardly projecting ridges when the three segments are united around the hose 10.
The innermost sur~aces of the ridges are of a tapered form such that in assembly of the segments the ridges have inner surfaces of frusto-conical shape, with the innermost edge 18 of each ridge being only slightly rounded so as to tend readily to dig into the hose cover material 12. The inner surfaces are tapered at an angle of 10 relative to the longitudinal direction of the coupling assembly.
The axially outer end ridges 15, 17 depend radially inwards from valley surfaces 19 by a distance approximately twice the distance that the centre ridge 16 depends inwards, and said end ridges are longitudinally spaced to align with 5 1 1 623~8 a pair of annular retention grooves 20 in the radially outer surface of the coupling sleeve. The grooves 20 each have a width, considered in the longitudinal direction of the coupling, which is greater than the width of the end ridges 15, 17 such that the grooves 20 and ridges 15, 16 17 define therebetween a space which in cross-section is of a substantially sinusoidal shape.
In use of the clamp segments the segments are positioned such that the edges 18 of each ridge lie nearest the end of the hose, said edges then tending to dig into the hose to restrain movement of the hose through the sinusoidal space between the clamp segments and the coupling sleeve. The diametex of the innermost edge 18 o~ the assembly o~ clamp segments is pre-selected in relatlon to the cross-sectional dimension of a hose, to which it is to be fitted, in such manner that in the final assembly a seal is obtained between the clamp sleeve and segments, and the hose be~ore the neighbouring edges of the successive clamp segments come into contact one with the other.
The edges 18 of the ridges 15, 16, 17 preferably are slightly rounded so as to bite into but not cut the hose.
However for some applications, where it may be pre~erred that the ridges cut into the hose, the edges 18 may be acute angled and relatively sharp.
The clamp segments may be secured together in substantially the same manner as above-described ~or co~Yentional two segment clamps. Thus the clamp segments ~ J ~2388 may be secured by bolts extending therebetween, optionally between flange portions provided in the segment, or the segmen~ may be held together by means of an encircling metal strap.
The clamp segments each have an integral end portion 22 which extends in the same direction as the direction of increasing diameter of the frusto-conical shape surfaces of the ridges. The end portion 22 is tapered, it having an inn~ tapered surface 23 angled in the region 15 to 20 relative to the longitudinal axis of the hose and being intended to provide a gradual transition from the constrained diameter wi$hin the clamp to the free diameter of the hose beyond the clamp when swollen under internal pre~sure, the hose being shown in an inflated condition and bearing against said surface 23. The end portion 22 in addition has an outer tapered surface 24 which is intended to resist snagging when the hose is dragged. The outer surface has a taper angled typically in the range 30 to 35 The provision of clamp means comprising three or more segments is found significantly to reduce the problem of obtaining a fluid-tight seal. By the use of three or more segments instead of two segments dimensional variations in the wall thickness of the hose or dimensions of the clamp means or coupling sleeve are found to have substantially less effect on the ability o~ the clamp means to encircle the hose and hold it firmly in ~luid-tight manner against the inner coupling sleeve. In ~ 1 62388 combination the provision of the clamp means with three ridges provides effective restraint of the hose against axial movement away from the coupling.
Claims (12)
1. A hose clamp assembly comprising hose clamp means comprising at least three clamp segments, a coupling sleeve to extend within the bore of a hose and means for securing said clamp segments together round the coupling sleeve to form a clamp assembly; each of said segments having its respective inwardly facing clamping surface for contacting the hose, said clamping surfaces each being provided with a series of inwardly facing ridges spaced longitudinally of one another, said ridges extending round the circumference of the clamp assembly; said coupling sleeve having an outwardly facing clamping surface for contacting the hose, said clamping surface being provided with at least two grooves extending round the circumference of the coupling sleeve, said grooves being spaced longitudinally of one another for alignment with said inwardly facing ridges on the annular clamp.
2. A hose clamp assembly according to Claim 1, wherein the clamping surfaces each have three longitudinally spaced circumferentially extending ridges consisting of two outer ridges and one centre ridge.
3. A hose clamp assembly according to Claim 2 wherein the longitudinally outer two of the ridges extend further radially inwards than the centre ridge.
4. A hose clamp assembly according to Claim 2 wherein the radially inner surface of each ridge is tapered relative to the longitudinal direction of the clamp means.
5. A hose clamp assembly according to Claim 4 wherein said radially inner surface has a taper angle of between 5° and 15° relative to the longitudinal direction of the clamp means.
6. A hose clamp assembly according to Claim 5 wherein said taper angle is 10°.
7. A hose clamp assembly according to Claim 1 wherein the clamp segments each have an end portion the radially inner surface of which is tapered and defines a bore the cross-section of which increases in a longitudinal direction away from the ridges.
8. A hose clamp assembly according to Claim 7 wherein the radially inner surface of each ridge of each clamp segment is tapered and increases in diameter in a direction the same as the longitudinal direction of increasing diameter of the inner surface of the end portion.
9. A hose clamp assembly according to Claim 7 or Claim 8 wherein the inner surface of the end portion is tapered at an angle in the range 15° to 20° relative to the longitudinal axis of the clamp means.
10. A hose clamp assembly according to Claim 1 wherein the coupling sleeve is provided with two grooves extending round its circumference.
11. A hose clamp assembly according to Claim 1 wherein the width of each groove of the coupling sleeve as considered in the longitudinal direction is greater than the width of each ridge of the annular clamp.
12. A hose clamp assembly according to Claim 1 wherein the grooves in the coupling sleeve co-operate in the assembled coupling with the ridges of the clamp segments to define therebetween a space of substantially sinusoidal shape as considered in longitudinal cross-section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000352183A CA1162388A (en) | 1980-05-16 | 1980-05-16 | Hose clamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000352183A CA1162388A (en) | 1980-05-16 | 1980-05-16 | Hose clamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1162388A true CA1162388A (en) | 1984-02-21 |
Family
ID=4116984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000352183A Expired CA1162388A (en) | 1980-05-16 | 1980-05-16 | Hose clamp |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1162388A (en) |
-
1980
- 1980-05-16 CA CA000352183A patent/CA1162388A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |