| 摘要 |
An adjustable depth of drive device for use on a fastener driving tool. The adjustable depth of drive device includes a thumb post (18) which is mounted to, and extends from a work piece contact element (16) of the tool. Also included is a thumb wheel (20) which is removably attached to the thumb post (18). A spring member (22) is another part of the adjustable depth of drive device, and it is engagable with the thumb wheel (20) in at least two positions. In a first position, the spring member (22) is frictionally engaged with the thumb wheel (20) to prevent unwanted movement of the thumb wheel (20) relative to the thumb post (18), and this first position allows for fine adjustments of the position of the work piece contact element (16). In a second position, the spring member (22) is disengaged from the thumb wheel (20) to permit free rotation of the thumb wheel (20) on the thumb post (18), which allows for gross adjustments of the position of the work piece contact element (16).
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