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In order to construct a rail supporting means on the casing for a power driven chain saw in such a way that, when the saw chain is placed in position, the saw rail is already retained relatively firmly and is adjustable by means of the saw chain tightening device, a casing for a power driven chain s

In order to construct a rail supporting means on the casing for a power driven chain saw in such a way that, when the saw chain is placed in position, the saw rail is already retained relatively firmly and is adjustable by means of the saw chain tightening device, a casing for a power driven chain saw is provided with a drive unit driving the saw chain revolvingly via the saw rail with a rail supporting means with two fastening bolts penetrating a slot-like aperture constructed in the saw rail and a saw chain tightening device arranged within the area of the rail supporting means and a sprocket wheel cover which can be secured to the casing that overlaps and covers the rail supporting means, the sprocket wheel cover (10) being constructed in two portions and comprising a protective cover (20) and a clamping cover (30), the clamping cover (30) being provided with two perforations (12a, 13a) through which the bolts (12,13) are able to penetrate and it being possible for said clamping cover to be mounted by means of the saw rail retaining nuts (12b, 13b) which may be fitted onto the bolts (12,13) (FIG. 1).

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A casing for a power driven chain saw with a drive unit having a sprocket wheel driving a saw chain revolvingly on a saw rail, a rail supporting means having two fastening bolts penetrating a slot-like aperture constructed in the saw rail, a saw chain tightening device arranged within the area of th

A casing for a power driven chain saw with a drive unit having a sprocket wheel driving a saw chain revolvingly on a saw rail, a rail supporting means having two fastening bolts penetrating a slot-like aperture constructed in the saw rail, a saw chain tightening device arranged within the area of the rail supporting means and a sprocket wheel cover that can be secured to the casing and covers the sprocket wheel and the rail supporting means, characterized in that the sprocket wheel cover (10) is constructed in two portions which comprise a protective cover (20) and a clamping cover (30) separable from the protective cover, the protective cover being contoured in the area of the chain tightening device to receive the clamping cover such that each of the protective cover and the clamping cover defines an outer exterior surface on the sprocket wheel cover, and the clamping cover (30) cooperating with the rail supporting means for holding the saw rail to the casing.