Simplify* Valve Assembly
Page 41
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A""'type of valve-spring collar, which is so simple that one wonders why it has not been thought of before, has been patented by Mr. G. G Holdsworth, of Messrs. Ea.risdon Components, Moor Street, Coventry. Known as the Holdsworth collar, it is located on the valve stem on the taper principle, but is a simple one-piece unit, in contrast to the familiar three-piece arrangement of collar and split cotters.
The essence of the idea is the employment of a removal hole, of the same diameter as the valve stem, which is drilled eccentrically in the collar to intersect, or overlap, the tapered hole A taper is machined on the valve stem, the diameter of which is also reduced adjacent tc, the small end.of the taper. This reduced diameter corresponds with the distance across the intersection of the holes.
Thus the collar an be threaded over the end of the valve stem and, on reaching the reduced diameter, it has only to be pushed si&way, to bring the tapers into line. In practice, the collar is slid into positioi against the pressure of the valve spring, which tocks it in position as soon as it is moved sideways and is allowed to take or its position on the taper
Obvious advantages are ease of manufacture, lightness in relation terstrengtb, and simplicity of assembly and removal.