Nail driver bumper

Details Nail driver bumper Nail driver bumper

2006-11-07

2006-11-07

Smith, Scott A. (Department: 3721)

Elongated-member-driving apparatus

With means to move or guide member into driving position

Including supply magazine for constantly urged members

C173S211000

Reexamination Certificate

active

07131563

ABSTRACT:
A nail driver bumper comprises an inner pad and an outer pad which are made of heat-resisting elastomer material. A plurality of axial ribs is arranged between the inner pad and the outer pad. An axial slot is formed between two adjacent axial ribs. A top of each axial slot is communicated to the lower chamber of the cylinder. An axial channel and a radial channel are formed at the lower end of each axial slot. The entire axial channels and the radial channels are communicated with the axial slots and the central hole of the inner pad so as to communicate to the lower chamber. Thus, a plurality of air paths is informed between the inner pad and the outer pad so as to increase the surface area for an ability of preferred heat dissipating, and prolong the lifetime of the bumper.

REFERENCES:
patent: 3496840 (1970-02-01), Dorney et al.
patent: 4441644 (1984-04-01), Farian
patent: 4509669 (1985-04-01), Elliesen
patent: 4609135 (1986-09-01), Elliesen
patent: 4932480 (1990-06-01), Golsch
patent: 5025971 (1991-06-01), Schafer et al.
patent: 5131579 (1992-07-01), Okushima et al.
patent: 6779698 (2004-08-01), Lin
patent: 6779699 (2004-08-01), Aoki et al.

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