GB2214228A - Pipe clamp - Google Patents
Pipe clamp Download PDFInfo
- Publication number
- GB2214228A GB2214228A GB8901222A GB8901222A GB2214228A GB 2214228 A GB2214228 A GB 2214228A GB 8901222 A GB8901222 A GB 8901222A GB 8901222 A GB8901222 A GB 8901222A GB 2214228 A GB2214228 A GB 2214228A
- Authority
- GB
- United Kingdom
- Prior art keywords
- helix
- clamp
- pipe
- turn
- free ends
- 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.)
- Withdrawn
Links
- 239000000463 material Substances 0.000 claims description 7
- 239000012858 resilient material Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B2/00—Friction-grip releasable fastenings
- F16B2/02—Clamps, i.e. with gripping action effected by positive means other than the inherent resistance to deformation of the material of the fastening
- F16B2/06—Clamps, i.e. with gripping action effected by positive means other than the inherent resistance to deformation of the material of the fastening external, i.e. with contracting action
- F16B2/065—Clamps, i.e. with gripping action effected by positive means other than the inherent resistance to deformation of the material of the fastening external, i.e. with contracting action using screw-thread elements
-
- 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
- F16L25/00—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means
- F16L25/04—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means comprising a collar or ring having a threaded pin rigid with the pipe-encircling member
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B2/00—Friction-grip releasable fastenings
- F16B2/02—Clamps, i.e. with gripping action effected by positive means other than the inherent resistance to deformation of the material of the fastening
- F16B2/06—Clamps, i.e. with gripping action effected by positive means other than the inherent resistance to deformation of the material of the fastening external, i.e. with contracting action
- F16B2/08—Clamps, i.e. with gripping action effected by positive means other than the inherent resistance to deformation of the material of the fastening external, i.e. with contracting action using bands
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B7/00—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections
- F16B7/04—Clamping or clipping connections
- F16B7/0406—Clamping or clipping connections for rods or tubes being coaxial
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Clamps And Clips (AREA)
Abstract
A pipe clamp which comprises a resilient portion coiled to present at least one turn of a helix 22 and adapted to fit over a pipe to be clamped, together with means for reducing the diameter of the helix. The latter may be a bracket 28 over the free ends of the helix brought into engagement with a turn 30 of the helix by means of nuts 26. The clamp provides even pressure and a gas-tight seal without causing distortion of the pipe. <IMAGE>
Description
PIPE CLAMP
This invention relates to a pipe clamp and in particular relates to pipe clamps for use in connection with motor vehicle exhaust systems and the like.
The pipes forming a motor vehicle exhaust system often require to be joined together. To this end, one end section of one the two lengths of pipe to be joined is made slightly oversize and is longitudinally split. The oversize split end fits over the end of the other pipe and is clamped thereto usually by means of a conventional "Ubolt" such as is illustrated in figure 1 of the attached drawings.
The latter suffers from various disadvantages, one of the most important being the pressure is not applied to the pipe evenly since the sides of the U-bolt apply virtually no pressure, and thus a gas tight seal is very difficult to achieve.
The invention seeks to provide a form of pipe clamp improved in the above respects.
Accordng to the present invention there is provided a pipe clamp which comprises a resilient portion coiled to present at least one turn of a helix and adapted to fit over a pipe to be clamped, together with means for reducing the diameter of the helix.
The clamp of the invention completely circumscribes the pipe and applies pressure substantially evenly around its circumference Thus the clamping action may more easily be made gas tight. Furthermore distortion of the pipe, which commonly occurs with U-bolts, may be avoided.
The invention will be described further, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a diagrammatic view of a conventional U bolt;
Figure 2 is a perspective view of a pipe clamp in accordance with the invention;
Figures 3a to 3c are respectively front and side elevations and a plan view corresponding to figure 2;
Figures 4a to 4c are respectively front and side elevations of a second embodiment of the invention, and a further front elevation of the clamp in the tightened
configuration; and
Figures Sa to 5c are similar view to Figure 4 of a
third embodiment.
Referring to the drawings, the conventional U-bolt
illustrated in figure 1 has a U-section portion 10 adapted to receive a pipe 12 to be clamped. This comprises fee ends 14 and a bight 18. The free ends of the U-section 14 are threaded to receive nuts 16. A clamping bracket 20 is carried on the free ends below the nuts and is forced -downwardly in the direction of arrow A to contact the pipe
12 by tightening of the nuts 16. It will be appreciated
that the pressure on the pipe is exerted between the bracket 20 and the bight 18 of the U-section 10 with very
little pressure being exerted by the sides of the U
section.
Referring now to figures 2 and 3, a pipe clamp in accordance with the invention is illustrated. This consists of a helical portion 22 of a resilient material
forming at least one complete turn of a helix. As
illustrated, this embodiment has almost two complete turns.
The free ends 24 of the portion 22 are threaded as before and receive nuts 26. A bracket 28 fits over the free ends 22 and is drawn downwardly until it contacts the upper portion 30 of one turn of the helix. Further tightening of
the nuts 26 causes the helix to reduce its size thus applying substantially even pressure around the circumference of a pipe held within the portion 22.
The material from which the resilient portion 22 is made may be a similar material to that used in conventional
U-bolts, namely round section mild steel. This is sufficiently resilient to enable the helix to be reduced in size to clamp a pipe while returning to its original size when the nuts 26 are released to allow the pipe to be unclamped. Other materials may be used and it is envisaged that in certain circumstances that the material, rather than being resilient, may in fact be flexible, for example a chain provided with threaded end portions 24 to enable it to be drawn tightly around a pipe to clamp the same and subsequently be released when desired.
Turning now to Figure 4, and using like numerals for like parts, the clamp illustrated is essentially the same as that of Figures 2 & 3 except that the nut 26 are replaced by a bolt 30. The free ends 24 of the helix are welded or otherwise attached to a cross-bar 32 having a threaded hole therein for receiving the bolt 30. Figure 4a shows the bolt in its raised or loosened position in which the helix 22 may have an internal diameter of, say, 44 mm.
On tightening the bolt 30 it bears on the bracket 28 and reduces the diameter of the helix as before, to approximately 40 mm. This embodiment, requiring the manipulation of a single bolt head, is ideally suited to manual operation without the use of tools such as a spanner e.g. by the provision of a wing nut rather than a bolt head.
Figure 4 illustrates a further embodiment in which a single turn of helix 22 is employed. The free ends 24 have attached thereto. e.g. by welding, a nut 34 and a stop 36.
A bolt 38 passes through the nut 34 and engages the stop 36. On tightening the bolt 38, the stop 36 and nut 34 are pushed apart, reducing the diameter of the helix as shown in Figure 5c. The embodiment is simple and uses very little material. The action of pushing the helix ends apart has been found to be better than drawing them together since it results in a more even clamping action around the entire circumference of the helix. The stop 36 preferably is provided with an indentation or recess to receive the end of the bolt 38 and help prevent it slipping off the stop.
The clamp of the invention provides a simple and extremely effective means of forming a gas-tight seal in in clamping applications of all kinds, but in particular with exhaust systems of motor vehicles.
Claims (10)
1. A pipe clamp which comprises a resilient portion coiled to present at least one turn of a helix and adapted to fit over a pipe to be clamped, together with means for reducing the diameter of the helix.
2. A clamp as claimed in claim 1 in which the helix presents substantially two turns.
3. A clamp as claimed in claim 2 in which the means for reducing the diameter of the helix comprises a bracket located on the free ends of the resilient portion bearing against a turn of the helix.
4. A clamp as claimed in claim 3 in which the bracket is is moved by the action of nuts mounted on threaded portions of the free ends.
5. A clamp as claimed in claim 2 in which the free ends terminate in a cross-bar through which a bolt acts against a turn of the helix.
6. A clamp as claimed in claim 5 in which the bolt is provided with a wing nut for manual operation.
7. A clamp as claimed in claim 1 in which a single turn of helix is provided and the means for reducing the diameter of the helix comprises a bolt arranged to force apart the free ends of the helix.
8. A clamp as claimed in any of claims 1 to 7 in which a flexible material is employed rather than a resilient material.
9. A clamp as claimed in claim 8 in which the flexible material is a metal chain or braid.
10. A pipe clamp substantially as hereinbefore described and as illustrated in Figure 2 to 5 of the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB888801386A GB8801386D0 (en) | 1988-01-22 | 1988-01-22 | Pipe clamp |
Publications (2)
Publication Number | Publication Date |
---|---|
GB8901222D0 GB8901222D0 (en) | 1989-03-15 |
GB2214228A true GB2214228A (en) | 1989-08-31 |
Family
ID=10630346
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB888801386A Pending GB8801386D0 (en) | 1988-01-22 | 1988-01-22 | Pipe clamp |
GB8901222A Withdrawn GB2214228A (en) | 1988-01-22 | 1989-01-20 | Pipe clamp |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB888801386A Pending GB8801386D0 (en) | 1988-01-22 | 1988-01-22 | Pipe clamp |
Country Status (1)
Country | Link |
---|---|
GB (2) | GB8801386D0 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2112051A (en) * | 1981-12-19 | 1983-07-13 | Terry And Sons Limited Herbert | Worm drive clips |
GB2112445A (en) * | 1981-11-18 | 1983-07-20 | Gkn Mills Building Serv | Scaffold support structure |
GB2207184A (en) * | 1987-07-21 | 1989-01-25 | Lawrence Curtis | Retaining clip for tubing |
-
1988
- 1988-01-22 GB GB888801386A patent/GB8801386D0/en active Pending
-
1989
- 1989-01-20 GB GB8901222A patent/GB2214228A/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2112445A (en) * | 1981-11-18 | 1983-07-20 | Gkn Mills Building Serv | Scaffold support structure |
GB2112051A (en) * | 1981-12-19 | 1983-07-13 | Terry And Sons Limited Herbert | Worm drive clips |
GB2207184A (en) * | 1987-07-21 | 1989-01-25 | Lawrence Curtis | Retaining clip for tubing |
Also Published As
Publication number | Publication date |
---|---|
GB8801386D0 (en) | 1988-02-24 |
GB8901222D0 (en) | 1989-03-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |