| 摘要 |
<p>Safety hatch for tanks, washing machines and industrial machines and plants in general, which comprises a plate (11) cooperating with a positioning frame (14) and solidly associated with an opener arm (12) pivoted on one side of the frame (14), opening and closing means of a type including an inwardly threaded knob (17, 117) being included and being associated with an outwardly threaded pin (18) pivoted at its lower end and solidly associated with the frame (14), the threaded pin (18) and threaded knob (17) cooperating with a positioning seating (21) defined by a hole in the opener arm (12), the threaded pin (18) passing through the inwardly threaded knob (17, 117) and including at its upper end removable closure means (23, 24) limiting the travel of the inwardly threaded knob (17, 117), the positioning seating (21) including a lateral opening (22) having a width at least narrower than the dimension of the hole defining the positioning seating (21) itself, the inwardly threaded knob (17, 117) having at the lower end and solidly associated a clamping ring (25) the width of which is at least greater than the lateral opening (22) of the positioning seating (21), and the length ("l") of which is at least greater than ("l1") the distance travelled by the inwardly threaded knob (17, 117) as it is unscrewed, defined by the closure means (23, 24), added at least to the distance travelled ("l2") by the said closure means (23, 24) as they are unscrewed. <IMAGE></p> |
