Elongated-member-driving apparatus – With means to move or guide member into driving position – With means to assure correct orientation of member
Reexamination Certificate
2003-03-20
2004-01-13
Smith, Scott A. (Department: 3721)
Elongated-member-driving apparatus
With means to move or guide member into driving position
With means to assure correct orientation of member
C227S136000, C081S434000
Reexamination Certificate
active
06676001
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relate to a screw positioning device, more particularly to a screw positioning device for a screw driving gun.
2. Description of the Related Art
Referring to
FIGS. 1 and 2
, a conventional screw driving gun
1
is shown to be adapted for use with a screw feed belt
16
that has a belt body
160
and a plurality of screws
161
detachably retained on the belt body
160
. The screw driving gun
1
includes a gun housing
11
, a stationary barrel part
12
, a slidable barrel part
14
, a screw-driving shaft
13
, and a positioning member
15
.
As illustrated, the stationary barrel part
12
is secured to and projects outwardly from the gun housing
11
, and defines a shaft-receiving chamber
120
to receive the screw-driving shaft
13
therein. The slidable barrel part
14
is mounted slidably on the stationary barrel part
12
, defines a screw-receiving chamber
141
for receiving the screw
161
that is fed into the screw-receiving chamber
141
in a transverse direction relative to an axis of the screw-driving shaft
13
. The screw
191
extends out of the slidable barrel part
14
upon sliding movement of the slidable barrel part
14
toward the gun housing
11
. The positioning member
15
is secured to a front end of the slidable barrel part
14
for abutting against the surface
170
of a work piece
17
that rests on a wall structure
18
so that the work piece
17
can be fastened an the wall structure is when the screw
161
is driven and rotated by the screw-driving shaft
13
upon operation of the screw driving gun
1
.
A disadvantage of the conventional screw driving gun
1
resides in that, in case the screw
161
has a relatively long length, the belt body
160
is unable to maintain the orientation of the screw
161
along an axis of the screw-driving shaft
13
. Thus, inclination of the screw
161
relative to the axis of the is screw-driving shaft
13
by virtue of gravity will occur.
SUMMARY OF THE INVENTION
Therefore, the object of this invention is to provide a screw positioning device that is used in a screw driving gun and that in provided with spring-biased screw-holding units to overcome the aforesaid disadvantage of the prior art.
The screw positioning device of the present invention is used in a screw driving gun that includes a gun housing, a screw-driving shaft, and a barrel unit. The barrel unit has a stationary barrel part secured to and projecting outwardly from the gun housing so as to define a shaft-receiving chamber for receiving the screw-driving shaft therein, and a slidable barrel part mounted on and slidable relative to the stationary barrel part. The slidable barrel part defines a screw-receiving chamber for receiving a screw that is detachably retained on a belt and that is fed into the screw-receiving chamber in a transverse direction relative to an axis of the screw-driving shaft. The screw is driven by the screw-driving shaft, and extends out of the slidable barrel part upon sliding movement of the slidable barrel part toward the gun housing. Accordingly, the screw positioning device of the present invention includes: a tubular member having a coupling end adapted to be connected co-axially to the slidable barrel part for co-movement therewith relative to the screw, a discharge end opposite to the coupling end, and a peripheral wall extending between the discharge and coupling ends and defining a screw-guiding chamber therein. The tubular member is slidable together with the slidable barrel part relative to the screw along the axis to a discharging position, in which the screw extends into the screw-guiding chamber. Two opposing spring-biased screw-holding units are disposed within the screw-guiding chamber, are mounted on the peripheral wall of the tubular member, and include first and second urging members and first and second screw-holding members which radially project from the peripheral wall into the screw-guiding chamber and which are respectively urged by the first and second urging members to move toward each other in such a manner that the first and second screw-holding members come into contact with and are pushed by the screw to move radially away from each other against urging action of the first and second urging members and that the first and second screw-holding members are urged by the first and second urging members to abut against the screw when the tubular member is slid to the discharging position, thereby positioning the screw at a center position, in which the screw extends along the axis.
REFERENCES:
patent: 5402695 (1995-04-01), Hornung
patent: 5671645 (1997-09-01), Murayama et al.
patent: 5934162 (1999-08-01), Habermehl
patent: 6089437 (2000-07-01), Blacket et al.
patent: 6296166 (2001-10-01), Huang
Chen Diing-Shen
Chen Ru-Ling
Rosenberg , Klein & Lee
Smith Scott A.
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