Hose clamp with internal clamping surfaces devoid of gaps, steps or discontinuities

A clamp, comprising clamping band means having clamping band end portions intended to form overlapping inner and outer band portions in the installed condition, a connection in the area of the free end of the outer band portion operable to connect overlapping band portions in the circumferential direction, a tightening device for tightening the clamping band means about an object to be fastened thereby, said tightening device forming a gap in the circumferential direction of the clamping band means, and further means assuring gap-free and stepless internal clamping surfaces of the clamping band means at the end of the inner clamping band portion including a male member near the end of the inner band portion adapted to cooperate with a female member in the outer band portion, said male member having a width less than the full band width and being provided with a bent-up tab-like member on each side thereof, and said outer band portion being provided with two guide slots for engagement by said tab-like members to guide relative movements of the inner and outer band portions during tightening of the tightening device.