| 主权项 |
1. A portable Brinell metal hardness tester comprising:
(a) a carriage movable vertically along elevating screws; (b) a test head, mounted in the carriage, for applying preselected force to a test piece including:
i) a reciprocable pumping plunger for supplying hydraulic fluid pressure to a ball contacting the test piece, the pumping plunger having a rack formed therein;ii) a rotatable gear engaging the rack, for imparting longitudinal motion to the plunger upon rotation of the gear;iii) a pressure release valve for releasing hydraulic fluid pressure when desired, comprising:
(1) a handle, extending outwardly from the test head for opening and closing the release valve, comprising:
(A) a ring-like portion receivingly gripping a shaft portion of the pressure release valve;(B) an intermediate portion connected to the ring-like portion;(C) a blade portion, connected to the intermediate portion, of upstanding planar configuration. (c) a manually movable lever connected to the gear and being rotatable therewith, pivotally mounted on the test head exterior, for imparting rotary movement about the axis of rotation of the gear; and (d) a stop, connected to the carriage and positioned to contact the lever at a predetermined position of lever angular movement, for limiting lever angular travel and thereby limiting angular movement of the gear to a preselected amount. |
