Abrasion-resistant bumper for a nail-driving tool

Details Abrasion-resistant bumper for a nail-driving tool Abrasion-resistant bumper for a nail-driving tool

2001-10-15

2004-08-24

Rada, Rinaldi I. (Department: 3721)

Elongated-member-driving apparatus

With means to move or guide member into driving position

Including supply magazine for constantly urged members

C227S010000, C173S210000

Reexamination Certificate

active

06779698

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an abrasion-resistant bumper for a nail-driving tool.
2. Description of the Related Art
U.S. Pat. No. 4,932,480 to Golsch issued on Jun. 12, 1990 discloses a pneumatically powered nail-driving tool
10
comprising a cylinder
20
, a piston
26
reciprocatingly received in the cylinder
20
, and a main valve
60
for driving the piston
26
. A driving element
32
is attached to the piston
26
for driving a nail. Movement of the piston
26
is arrested by an air-cooled bumper
70
to thereby provide a cushioning effect. As illustrated in
FIGS. 2 through 5
of this patent, the bumper
70
comprises an upper end
100
, a lower end
102
, an inner peripheral surface
104
, and an outer peripheral surface
106
. The bumper
70
has an annular flange
108
extending outwardly at its lower end
102
. The annular flange
108
fits into the annular recess
82
in the cylindrical wall
24
, when the bumper
70
is fitted within the cylinder
20
, so as to secure the bumper
70
against the end wall
24
. The bumper
70
has eight slots
110
extending radially from the inner peripheral surface
104
and eight slots
112
extending radially from the outer peripheral surface
106
. Arrangement of the slots
110
and
112
in the bumper
70
provides a food bumping effect. However, since the bumper
70
is made of a single resilient or elastomeric material, the face of the bumper
70
that is subject to impact of the piston
26
would become soft and thus lose its impact-resisting effect. In addition, breakage tends to occur between the slots
112
and the slots
110
. Further, when the upper end
100
of the bumper
70
is subject to the impact from the piston
26
, the bumper
70
is already in intimate contact with the cylinder
20
and thus has a low cushioning effect, as there is no room allowing further deformation of the bumper
70
. Further, during assembly of the bumper
70
, the slots
112
of the bumper
70
must be aligned with the ports
80
in the cylinder
20
in order to assure exhaustion of the air in the space
30
below the piston
26
via the ports
80
. Difficulty and inconvenience in the assembly procedure are thus caused.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an abrasion-resistant bumper for a nail-driving tool comprising a cylinder defining a chamber for reciprocatingly receiving a piston. The bumper comprises a first bumper section and a second bumper section made of a material having a rigidity different from that of the first bumper section. When in a driving stroke of the piston toward the bumper, air in the chamber exits the cylinder via ports of the cylinder.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.


REFERENCES:
patent: 2821170 (1958-01-01), Jacobs
patent: 2983922 (1961-05-01), Jiulfs
patent: 3190187 (1965-06-01), Doyle
patent: 3205787 (1965-09-01), Volkman
patent: 3387541 (1968-06-01), Bade
patent: 3572211 (1971-03-01), Doyle
patent: 3574379 (1971-04-01), Jordan
patent: 3760695 (1973-09-01), Rothfuss
patent: 3784182 (1974-01-01), Sobel
patent: 3807281 (1974-04-01), Perkins
patent: 3828656 (1974-08-01), Biddle et al.
patent: 3969989 (1976-07-01), Maurer et al.
patent: 4050505 (1977-09-01), Kemper et al.
patent: 4558584 (1985-12-01), Myers
patent: 4609135 (1986-09-01), Elliesen
patent: 4625903 (1986-12-01), Becht
patent: 4909419 (1990-03-01), Yamada et al.
patent: 4932480 (1990-06-01), Golsch
patent: 5617925 (1997-04-01), Boothby et al.
patent: 6164510 (2000-12-01), Deieso et al.
patent: 6182881 (2001-02-01), Kellner et al.

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