| 摘要 |
<p>The improved shaft locking apparatus includes a body (34) with a bore (36) therethrough and includes balls (48) mounted in radial ports (44) in said body so that in one position the balls partially extend into the bore and in restricting the bore lock a shaft (22) associated with the apparatus from axial movement. A heat sensitive material (72) is used as a part of the balls supporting means and when it is subjected to excessive heat, heat above its design limitations, its support of the balls relaxes and allows their retraction from the bore to thereby allow axial movement of the shaft. In one form of the invention the shaft extends into the bore of the annular body and the balls engage the end of the shaft to support it against axial movement and in another form a rod extension is positioned in the bore of the annular body and includes external ball receiving recesses which prevent movement of the rod extension when the balls are in engagement with such recesses and allows movement responsive to the relaxation of the ball support when exposed to excessive heat conditions, the shaft which is supported by the rod extension is then allowed to move axially responsive to the ball retractions.</p> |
