| 摘要 |
<p>Chop Saw Arrangement A chop saw (10) comprises a table (12), a pivot member (14) on the table, a saw assembly (16) pivoted about axis (18) to the pivot member, a blade (26) journalled in said assembly, a motor (22) to drive the blade, an upper guard (32) to cover an upper portion of said blade, which upper guard is pivoted to said assembly, and a lower guard (40) to cover a lower portion of said blade, which lower guard is also pivoted to said assembly, both about the blade axis (28). A parallelogram lever (34) has a pivoted connection to the pivot member (38) and upper guard (36) to maintain the orientation of the upper guard in all pivot positions of the assembly. An extension (35) of the parallelogram lever co-operates a flange (100) on the lower guard such that, in a raised rest position of the saw assembly and in an unopened position of the lower guard, the extension engages the flange and prevents downward pivoting of the assembly. An actuator (94) opens the lower guard to an extent sufficient to rotate the flange out of abutment with the extension, whereupon subsequent downward pivoting of the saw assembly serves to engage the extension with a cam surface of the flange to open further the lower guard. ¢Figure 3a!</p> |
