Hose clamp

1. A hose clamp for clamping a hose to an object, the hose clamp comprising:

a clamping band in which an ear-like tightening device has two outward extending legs and a web portion interconnecting the legs;

wherein an inner side of the clamping band has a recess in an area which, in a tightened condition, lies upon the hose, the recess having its boundary entirely within the clamping band;

wherein the recess has a shape of a drop falling toward the center of the clamping band;

wherein the width of the drop shaped recess decreases in a direction from a center of the clamping band toward an end thereof as viewed in a longitudinal direction of the band;

wherein the drop shape recess has a surrounding wall which is shallower at a wider end of the drop shaped recess than at a narrower end; and

wherein the drop shape of the recess hinders back movement of the hose such that hose material that has entered into the recess when the tightening device has been narrowed is urged in the direction of decreasing width of the recess when the tightening force is removed.

2. The hose clamp of claim 1 , wherein the drop shaped recess is disposed near the tightening device.

3. The hose clamp of claim 1 , wherein the clamping band, in a condition in which the clamping band is mounted on said object, forms an inner end portion and an outer end portion overlapping the inner end portion, and the tightening device is disposed in an area of the outer end portion overlapped by the inner end portion.

4. The hose clamp of claim 3 , wherein the drop shaped recess is disposed in that part of the clamping band which in the mounted condition of the hose clamp lies between the legs of the tightening device.

5. The hose clamp of claim 4 , wherein the drop shaped recess is defined by an embossment projecting from an outer side of the clamping band.

6. The hose clamp of claim 5 , wherein the web portion of the ear-like tightening device is stiffened by an outward concave bead.