Elongated-member-driving apparatus – With interlock means
Reexamination Certificate
2000-02-01
2001-09-11
Smith, Scott A. (Department: 3721)
Elongated-member-driving apparatus
With interlock means
C227S148000, C227S156000
Reexamination Certificate
active
06286742
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a nail driving tool.
BACKGROUND OF THE INVENTION
Heretofore, for example, as shown in Publication of Unexamined Japanese Utility Model Application No, 2-51079, there is known a nail driving tool provided with a driver guide having an injection hole for driving a nail and a contact arm surrounding an outer surface of a forward end of the driver guide in a nail driving direction, movable on an axial line along the nail driving direction, for making triggering operation for driving a nail effective by being moved in the opposite direction to the nail driving direction.
However, it is difficult for the user of such a conventional nail driving tool to see and aim at the point for driving a nail, since a size of a forward end portion of the contact arm in the nail driving direction is large.
SUMMARY OF THE INVENTION
An object of the invention is to provide a nail driving tool by which the user can easily see and aim at the point for driving a nail.
The object of the invention is attained by providing a nail driving tool provided with a driver guide including an injection hole for driving a nail and a contact arm surrounding an outer surface of a forward end of the driver guide in a nail driving direction, provided with an eject hole penetrating through the contact arm along the nail driving direction and movable on an axial line along the nail driving direction, for making triggering operation for driving a nail by being moved in the opposite direction to the nail driving direction, wherein a diameter of an outer surface of the contact arm is decreased taperingly toward its edge in the nail driving direction.
The diameter of the outer surface of the contact arm in the vicinity of the forward end of the contact arm in the nail driving direction may be preferably equal to or smaller than a diameter of an outer surface of the driver guide in the vicinity of the forward end of the driver guide in the nail driving direction.
According to the nail driving tool of the invention, the user can easily see and aim at the point to drive a nail.
Moreover, an inner diameter of the eject hole of the contact arm in the vicinity of the forward end of the contact arm in the nail driving direction may be nearly equal to an inner diameter of the injection hole of the driver guide in the vicinity of the forward end of the driver guide in the nail driving direction.
In this case, since a nail driven from the injection hole of the driver guide is guided by an inner surface of the eject hole, the nail driven to the outside via the eject hole becomes less easily leaned, thereby a problem like buckling of the nail being prevented. Therefore, driving of a nail can be performed in desirable condition.
Moreover, a spike for preventing slippage of the contact arm when driving a nail obliquely may preferably be provided on an outer surface of a forward end portion of the contact arm in the nail driving direction.
When a nail is driven obliquely into an object material such as wood and the like, if the spike is stuck in the surface of the object material before driving a nail, the forward end portion of the contact arm can be fixed on the surface and so a nail can be driven exactly at the aimed point.
Moreover, there may be further provided with an adapter with a through hole penetrating through the adapter itself along the nail driving direction, which can be detachably attached to the forward end portion of the contact arm in the nail driving direction by inserting the forward end portion into the through hole. At least on one side of the adapter and the forward end portion of the contact arm, a means may be provided for determining a circumferential attachment position which determines a position of the adapter relative to the contact arm among a plurality of different positions along the circumferential direction of the contact arm around a center line of the through hole of the adapter.
By using the means, the circumferential attachment position of the adapter can be changed to a desired position without exchanging the adapter to another one, when it becomes necessary to change the circumferential attachment position on driving a nail.
Therefore, according to the nail driving tool of the invention, a plurality of adapters corresponding to the respective desired circumferential attachment positions are not necessary and the circumferential attachment position can be changed using only one adapter.
Moreover since there is no need to exchange the adapter when changing the circumferential attachment position, the efficiency of the nail driving operation is improved.
The means for determining the circumferential attachment position is preferably constituted such that at least two recesses are provided on one side of the inner surface of the through hole of the adapter and the outer surface of the forward end portion of the contact arm, protrusions of one or more, equal to or less than the number of the recesses, are provided on the other side of the surfaces that is not provided with the recesses, and the protrusions are designed to be engaged with the recesses on different positions corresponding to the circumferential attachment position of the adapter relative to the contact arm, when the adapter is attached to the forward end portion of the contact arm.
According to the means, the adapter is securely held in the desired circumferential attachment position by engaging the protrusions with the recesses, though the circumferential attachment positions of the adapter are restricted to the positions where the protrusions engage with the recesses.
Moreover, a groove is provided on one side of the inner surface of the through hole of the adapter and the outer surface of the forward end portion of the contact arm along the circumference, and on the other side that is not provided with the groove, an engaging protrusion is provided at a position corresponding to the groove. When the adapter is attached to the forward end portion of the contact arm, the engaging protrusion is engaged with the groove. Then, even when the adapter is rotated on the contact arm around the center line of the through hole of the adapter, the engaging protrusion slides in the groove and the position of the adapter relative to the contact arm in the nail driving direction does not change.
According to such a nail driving tool, even when the circumferential attachment position of the adapter is changed by the operator's hand of the nail driving tool after attaching the adapter, the position of the adapter in the nail driving direction can always be kept constant and a driving depth of a nail driven from the nail driving tool in the object can be kept constant.
Specifically, if the position of the adapter in the nail driving direction is changed, for example, when the circumferential attachment position of the adapter is changed, the driving depth of the nail driven from the nail driving tool in the object is changed. But by providing the groove and engaging protrusion and engaging them with each other, as mentioned above, the position of the adapter in the nail driving direction can be kept unchanged and driving depth of nails in the object can be always kept constant before and after the circumferential attachment position is changed, even if the circumferential attachment position is changed by the operator's hand of the nail driving tool after attaching the adapter.
If the above-mentioned protrusions and recesses are further provided as well as the above-mentioned groove and engaging protrusion, the protrusions become easily engaged with the recesses when the adapter is rotated around the center line of the through hole of the adapter after attaching the adapter.
Specifically, after the adapter is attached, since the position of the adapter in the nail driving direction is always kept constant by the engaging protrusion being slid in the groove during the process of changing the circumferential attachment position, there is no need to do such a work necessary in the case where a groov
Davis & Bujold P.L.L.C.
Makita Corporation
Smith Scott A.
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