Pipe clamp
A pipe clamp includes two clamping members which are hinged together at one end and releasably secured together at the other end. The clamping members each comprising an arcuate, radially inner portion which extends in the longitudinal direction of the clamping member and which in profile comprises a bottom portion and two lips which each extend radially inwardly from a corresponding side of the bottom portion. Each lip includes a main portion which extends circumferentially along the inner portion, and at least one lip of at least one clamping member comprises an arcuate circle sector portion which extends between the main portion and an end of the clamping member. In addition, the main portion comprises a lip radius and the circle sector portion comprises a circle sector radius that is larger than the lip radius.
1. A pipe clamp for securing a first hubbed end portion of a first member to a second hubbed end portion of a second member, the first and second members comprising a common center axis, the pipe clamp comprising:
two clamping members which each comprise a first end and a second end, the first ends being pivotably connected about a pivot axis which is substantially parallel to the center axis and the second ends being connected by a securing device, the pipe clamp being arranged to press the first and second hubbed end portions against each other when the clamping members are secured together;
the clamping members each comprising an arcuate, radially inner portion which extends in the longitudinal direction of the clamping member and which in profile comprises a bottom portion, two lips which each extend radially inwardly from a corresponding side of the bottom portion, and two obliquely oriented contact faces which each extend radially outwardly from a corresponding lip towards the bottom portion, each lip including a main portion which extends circumferentially along the inner portion and comprises a lip radius;
wherein at least one lip of at least one clamping member comprises an arcuate circle sector portion which extends between the main portion and one of the first and second ends and comprises a circle sector radius that is larger than the lip radius; and
wherein in the closed position of the pipe clamp the contact faces engage the first and second hubbed end portions along substantially the entire lengths of the main and circular sector portions.
2. A pipe clamp according to claim 1 , wherein the circle sector radius comprises a center point which lies on or near the center axis when the pipe clamp is in a fully open position.
3. A pipe clamp according to claim 1 , wherein each lip of each clamping member comprises a circle sector portion which extends between the main portion and one of the first and second ends and comprises a circle sector radius that is greater than the lip radius.
4. A pipe clamp according to claim 3 , wherein each lip of each clamping member comprises a circle sector portion which extends between the main portion and the other of the first and second ends and comprises a circle sector radius that is greater than the lip radius.
5. A pipe clamp according to claim 4 , wherein the circle sector radii of the two circle sector portions are the same.
6. A pipe clamp according to claim 5 , wherein the circle sector portion extending from the first end traverses an angle of between about 10 degrees and 35 degrees and the circle sector portion extending from the second end traverses an angle of between about 5 degrees and 25 degrees.
7. A pipe clamp according to claim 1 , wherein a transition between the lip and the obliquely oriented contact face, seen in a radial direction from the center axis towards an end of the circle sector portion opposite the corresponding first or second end of the clamping member, projected on a plane at right angles to the circle sector radius, forms an apparent straight line.
8. A pipe clamp according to claim 1 , wherein at least one clamping member comprises a clamp contact radius which is greater than a hub contact radius of a corresponding hubbed end portion.
9. A pipe clamp according to claim 1 , wherein a transition between the lip and the obliquely oriented contact face comprises a rounded surface having a radius in the range of 60 mm to 20 mm.
10. A pipe clamp according to claim 1 , wherein at least one of the lips comprises an obliquely oriented guide face which is located on a side of the lip opposite the contact face and which extends radially outwardly at an angle in the range of 15 degrees to 65 degrees.
11. A pipe clamp according to claim 10 , wherein the guide face extends radially outwardly at an angle of about 30 degrees.
12. A pipe clamp according to claim 6 , wherein the circle sector portion extending from the first end traverses an angle of about 25 degrees and the circle sector portion extending from the second end traverses an angle of about 15 degrees.
13. A pipe clamp according to claim 9 , wherein the transition between the lip and the obliquely oriented contact face comprises a rounded surface having a radius of about 40 mm.