| 摘要 |
<p>A tubular latch includes: a biasing lever (5) pivotally mounted on a housing (1) of the latch having an upper depression portion (53) operatively pulled by a drag slide (4) biased by a cam (33) of a handle driving shaft (3), and having a lower forcing portion (54) of the biasing lever (5) operatively pulling a latch (2) for opening the door, whereby upon a depression of a handle (30) secured to the handle driving shaft (3) at a small angle to pull the drag slide (4) rearwardly to bias the upper depression portion (53) of the lever (5) about a lever pivot (51) with a small stroke, the lower forcing portion (54) below the upper depression portion (53) will be biased with a greater stroke for fully retracting the latch (2) for easily opening the door, without requiring a great rotating angle for depressing the handle (30). <IMAGE></p> |
