Tools – Wrench – screwdriver – or driver therefor – Machine
Reexamination Certificate
2000-03-30
2004-08-03
Wilson, Lee D. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Machine
C081S057370
Reexamination Certificate
active
06769332
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a successive screw driving attachment for successively driving screws in order to fasten sheets or boards made of wood, metal, gypsum, or the like to floors or walls, and more particularly to a successive screw driving attachment with which screws can be smoothly fed to the driving position of a bit.
2. Prior Art
There have been proposals in the past for a successive screw driving attachment that is attached to an electric screwdriver and that successively drives screws in order to fasten sheeting made of wood, metal, gypsum, or the like to floors or walls. As shown in
FIG. 12
, this type of successive screw driving attachment
101
has a screw feed mechanism
103
attached slidably in the driving direction of a screw S to a driver unit casing
102
that is used by being detachably connected to an electric screwdriver D.
This successive screw driving attachment
101
turns the S (corresponds to a standard screwdriver tool) with a rod-shaped bit
104
that drives the screw S, drives this screw S into a sheet or board, and at the same time gradually retracts the screw feed mechanism
103
within the driver unit casing
102
. The driving of the screw S is then concluded at the point when the distal end of this bit
104
is at roughly the same position as the distal end portion
103
a
of the screw feed mechanism
103
.
This successive screw driving attachment
101
makes use of a screw rope SR in which numerous screws S are stung onto a plastic rope. This screw rope SR is incrementally played out to the driving position of the bit
104
in interlock with the driving operation in the screw feed mechanism
103
. When this successive screw driving attachment
101
is used, the trigger switch on the grip handle of the electric screwdriver D is pulled, the bit
104
is turned by the motor of the electric screwdriver D, the distal end of the bit
104
is engaged with the head of the screw S at the distal end of the screw rope SR loaded in the screw feed mechanism
103
, and [the screw S] is driven into the sheeting or other material by the rotation of this bit
104
.
Problems which the Invention is Intended to Solve
Because a feed lever
105
for the screws S see-saws back and forth in the conventional screw feed mechanism
103
described above, the operation in which the screws S of the screw rope SR are grabbed by a screw feed prong
106
and fed to the driving position does not itself pose any problems. When the driving of a single screw S is complete, however, the next screw S is fed to the driving position while the screw feed mechanism
103
is still being pushed back to the distal end, so there is a problem in that the head of this next screw S hits the distal end of the bit
104
.
With the conventional successive screw driving attachment
101
, when the screw rope SR was loaded into the screw feed mechanism
103
, the first screw S had to be fed to the driving position by pressing this screw feed mechanism
103
against the sheeting once to effect the reciprocal action of the screw feed prong
106
. Also, a multi-step operation had to be carried out when the work of driving the screws S was complete and the screw rope SR was to be taken out of the screw feed mechanism
103
while still partially unused.
Furthermore, the attachment position of the rope R varied with the type of screws S being used. Because the position of the rope guide path of the screw feed mechanism
103
varied according to the length of the screws S, screws S with different attachment positions for the rope R could not be loaded into the same screw feed mechanism
103
. Moreover, since a single successive screw driving attachment
101
could only accommodate a narrow range of screw lengths, a dedicated successive screw driving attachment
101
had to be used for short screws, and another dedicated successive screw driving attachment
101
for long screws, meaning that a plurality of successive screw driving attachments
101
were required.
Another problem was that when the conventional successive screw driving attachment
101
was used on a floor, the worker had to operate the successive screw driving attachment
101
while bending over or kneeling, so the worker tended to become fatigued when working for an extended period. In view of this, there has been a need for the proposal of a successive screw driving attachment with which driving work could be performed while the worker was standing.
The present invention was conceived in light of the above problems, and it is an object thereof to provide a successive screw driving attachment with which the screw rope can be smoothly loaded to the driving position by delaying the timing at which the screws are fed to the driving position with a stopper provided to the feed lever of the screw rope, and with which there is no need to fed the first screw of the screw rope up to the driving position, and the screw rope can be removed with one finger.
SUMMARY OF THE INVENTION
In order to achieve the stated object, the successive screw driving attachment pertaining to the present invention is a successive screw driving attachment in which a screw feed mechanism and a distal end screw guide are provided to the front part of a driver unit, and a coupling tube for connecting to an electric screwdriver via a coupling adapter is provided to the rear part of the driver unit, the essence of which is that the driver unit forms a guide tube into which a bit is inserted, an elastic member is mounted for pressing the screw feed mechanism forward so that it is slidable in the longitudinal direction of the guide tube, and there is a drive depth adjustment mechanism that adjusts the depth to which the screw is driven by the bit, the screw feed mechanism is provided with a screw feeder comprising a screw feed prong that sequentially feeds the screws on a screw rope, in which numerous screws are lined up and attached to a rope, to the driving position of the bit in interlock with the longitudinal sliding of the driver unit that accompanies the driving action produced by the bit in the distal end screw guide, the screw feeder is structured such that the screw feed prong instantly feeds the next screw to the driving position when the screw feed mechanism has been pushed back to the distal end, and the distal end screw guide has a rope guide path for the screw rope, and has formed in it a screw feed hole for the reciprocal action of the screw feed prong.
With the above constitution, the successive screw driving attachment can be easily coupled to an electric screwdriver via a coupling adapter. In particular, a single successive screw driving attachment can be coupled to a number of different electric screwdrivers by exchanging the coupling adapter.
In the use of the successive screw driving attachment pertaining to the present invention, the first step is to load the screw rope into the distal end screw guide, which places the screw at the front of the screw rope in the driving position. The motor of the electric screwdriver is rotated, the contact face of the distal end screw guide of the screw feed mechanism is pressed against the sheeting or other material, and the bit is turned so that the screw can be gradually driven into the sheeting or other material. Simultaneously with this driving of the screw, the screw feed mechanism (the distal end screw guide) gradually retracts within the driver unit, the distal end screw guide that is integrated with this screw feed mechanism collides with and stops at a drive depth adjustment mechanism housed in the driver unit, and this disengages a clutch and concludes the driving of the screw.
When the distal end screw guide is removed from the sheeting, the screw feed mechanism is pushed back to its original position at the distal end, the screw feed prong of the screw feeder operates and instantly feeds the next screw on the screw rope to the driving position of the distal end screw guide, and screw driving work can then be performed in the same manner
Muro Corporation
Wilson Lee D.
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