Tools – Wrench – screwdriver – or driver therefor – Having work engaging and force exerting portion inserted...
Reexamination Certificate
1998-11-13
2001-09-04
Smith, James G. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Having work engaging and force exerting portion inserted...
C081S054000, C081S177200
Reexamination Certificate
active
06282998
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
This invention pertains to a fastener-driving accessory useful with a rotary driving tool, which may be electrically or pneumatically powered. Along with one stem or two stems connected by a quill, two interchangeable collars are provided, namely a fastener-driving collar and a bit-mounting collar. The fastener-driving collar can have two interchangeable sockets, either of which can serve as a fastener-driving socket. The bit-mounting collar can mount a fastener-driving bit of a type known heretofore.
BACKGROUND OF THE INVENTION
As exemplified in U.S. Pat. No. 4,236,555, it is known to equip a rotary driving tool, such as a screw gun, with a fastener-driving element, such as a socket head or a driving bit, which is carried by an elongate member, such as a rod, so as to enable the tool to be conveniently operated by a standing operator. As exemplified in U.S. Pat. Nos. 5,347,707, 5,445,297, 5,555,780, and 5,584,415, it is known to equip a roofing washer-dispensing and fastener-driving machine with a similarly equipped rotary driving tool.
This invention addresses a recognized need for an improved means for interchanging fastener-driving elements, such as socket heads and driving bits, in a rotary power tool, which may be electrically or pneumatically powered, particularly but not exclusively in a rotary power tool equipped with a fastener-driving element carried by an elongate member, as discussed above.
SUMMARY OF THE INVENTION
This invention addresses the aforementioned need by providing a fastener-driving accessory useful with a rotary power tool, which may be electrically, or pneumatically powered. In its simplest embodiments, the fastener-driving accessory comprises a collar-driving stem and a collar, either a fastener-driving collar or a bit-mounting collar. In one contemplated embodiment, the collar-driving stem is connected to a tool-drivable stem, by a quill.
The collar-driving stem defines an axis and has a collar-mounting portion having a polygonal cross-section. It is preferred that the collar-mounting portion has a hexagonal cross-section. Each of the fastener-driving and bit-mounting collars defines an axis.
The fastener-driving collar defines two axially aligned sockets, each having a polygonal cross-section, which is similar to but larger than the polygonal cross-section of the collar-mounting portion. The axially aligned sockets are interchangeable to serve respectively as a stem-receiving socket and as a fastener-driving socket.
The collar-mounting portion of the collar-driving stem is adapted to be non-rotatably plugged into whichever socket serves as the stem-receiving socket so as to mount the fastener-driving collar coaxially on the collar-driving stem.
Preferably, the fastener-driving collar has two opposite ends and one continuous passage defining the axially aligned sockets, extending between the opposite ends, and having a polygonal cross-section conforming to the polygonal cross-sections of the axially aligned sockets. Preferably, moreover, the collar-mounting portion of the collar-driving stem is adapted to be non-rotatably plugged more than half way through the continuous passage when plugged into either of the axially aligned sockets so as to protect the polygonal cross-section of an intermediate portion of the fastener-driving collar against wearing as either of the axially aligned sockets wears.
The bit-mounting collar has two opposite ends, namely a stem-receiving end and a bit-mounting end, the bit-mounting collar defines a stem-receiving socket opening at the stem-receiving end and having a polygonal cross-section, which is similar to but larger than the polygonal cross-section of the collar-mounting portion of the collar-driving stem. The bit-mounting collar has an axial passage extending between the bit-mounting end and the stem-receiving socket of the bit-mounting collar and having a circular cross-section with a cross-sectional area smaller than the cross-sectional area of the polygonal cross-section of the stem-receiving socket of the bit-mounting collar. The stem-receiving socket of the bit-mounting collar has sufficient axial length for the distal end of the collar-mounting portion of the collar-driving stem to be axially spaced from the axial passage when plugged into the stem-receiving socket.
The fastener-driving collar is designed to accommodate a fastener-driving bit of a type known heretofore. The polygonal cross-section of the socket-fitting portion of the fastener-driving bit conforms to the polygonal cross-section of the collar-mounting portion of the collar-driving stem. The fastener-driving portion, which has a fastener-driving tip, has an axial length longer than the axial length of the axial passage and has cross-sectional shapes adapting the fastener-driving portion to extend through the axial passage.
The fastener-driving bit is mountable to the bit-mounting collar with the socket-fitting portion fitting within the stem-receiving socket of the bit-mounting collar, between the collar-mounting portion and the axial passage, with the fastener-driving portion extending through the axial passage, and with the fastener-driving tip projecting axially from the bit-mounting collar.
The fastener-driving and bit-mounting collars are interchangeable. Means are provided for securing whichever collar is used removably on the collar-driving stem when the collar-mounting portion is plugged into whichever socket serves as the stem-receiving socket.
These and other objects, features, and advantages of this invention are evident from the following description of a preferred embodiment of this invention, with reference to the accompanying drawings.
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Illinois Tool Works Inc.
Rockey Milnamow & Katz Ltd.
Shakeri Hadi
Smith James G.
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