| 摘要 |
A machine and washer (18) for fastening one or more layers of roofing material (12) to an underlayment, includes a chute (50) which receives a stack of washers (18), a shuttle (70) which displaces a single washer (18 min ) to a separated position when moves in one direction, to which the shuttle is biased and releases the single washer (18 min ) when moves oppositely, and a gate (80), which cooperates with camming surfaces (18b) on the respective washers (18), restrains the overlying washer (18 sec ) in the stack (S) against being displaced with the single washer (18 min ) and restrains the single washer (18 min ) from being displaced from the separated position. Various components are provided by linking a stand-up screw gun (160 Figure 1) of a known type to the shuttle. The stackable washer (18) is embossed (352,354,356,358) so that each such washer and like overlying and underlying washers in a stack contact each other at three or more places, which define tangent planes intersecting planes defined by planar areas on such washers at angles more than 45 DEG but less than 90 DEG whereby such washers are spaced from each other around their entire peripheries (306) (Figures 22 and 23). Notches (64,66) in the washers (18) cooperate with ribs (60,62) in the chute (50) to ensure that a stack (S) of the washers is orineted properly when fitted into the chute (50). |
