(57) An end-face type commutator, especially for motor starters, comprising a conducting
annular disc having front and rear sides and a central passage, the disc being divided
into a plurality of lamellae by radial grooves. The annular conducting disc is coaxially
embedded in an insulating annular housing and engaged at its front and rear sides
therein in such a manner that, from its front side the disc is secured by an insulating
annular plate constituting an integral part of the housing and preventing axial displacement
of the lamellae during rotation of the commutator, and from its rear side the conducting
disc is provided with an outer and an inner annular protrusions forming a coupling
between the lamellae of the conducting disc and the insulating housing and preventing
radial displacement of the lamellae during the rotation. The outer annular protrusion
has a rectangular cross-section and is provided substantially along the outer circumference
of the annular conducting disc, whilst the inner annular protrusion is formed along
the central passage of said annular disc by flanging thereof in such a manner that
the central passage has the shape of a truncated cone narrowing towards the front
side of the disc.
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