Tool driving or impacting – Means to drive tool about an axis – Gear drive
Reexamination Certificate
1998-08-25
2001-01-09
Vo, Peter (Department: 3721)
Tool driving or impacting
Means to drive tool about an axis
Gear drive
C173S029000, C173S170000, C173S217000, C310S050000, C408S020000
Reexamination Certificate
active
06170579
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a power tool and, in particular, to a power tool having a conventional body portion and provided with a plurality of interchangeable tool heads.
2. Description of the Related Art
As a result of considerable developments within the field of power tools and the increased demand of the DIY market, the number of different types of power tool available to the consumer has risen considerably in the past decade. In particular even the most reluctant of DIY enthusiasts will own a power drill and jigsaw, whilst their more enthusiastic counterparts will also require electric sanders, power files, nibblers and other specialised power tools having dedicated purpose. Whilst this considerable array of power tools is often found to be useful, owning such a large number is both expensive and requires a considerable amount of storage space. In addition, having one specialised tool to perform each job often results in significant under-utilage of such a tool which are, generally, all operated by similar motors. Still further, many of todays power tools are “cordless”, being battery powered by rechargeable batteries, often requiring the user to change the battery pack when changing dedicated tools, or have several ready-charged batteries available for different tools. These current solutions are cumbersome or expensive respectively.
Attempts have been made to improve utilage of such power tools and to provide solutions to the above problems by the inclusion of attachments for a conventional drill, whereby the drill chuck is used to engage a drive mechanism of a reciprocating saw blade, an example of which is seen in U.S. Pat. No. 1,808,228. Another example of a multi functional tool shown in German Gebrauchsmuster 9010138 which shows a conventional drill body having a plurality of drill heads which operate at different speeds dependent on the gear reduction mechanism incorporated in those heads. However, the drawbacks of systems of this type is that where a drill chuck is used to operate a drive mechanism for a reciprocating saw, considerable energy is lost in the conversion mechanism of firstly driving a drill chuck which then drives the saw mechanism. Alternatively, where the tool incorporates interchangeable drill heads the variety of functions are somewhat limited to altering the speed of drilling.
BRIEF SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a power tool system which alleviates the aforementioned problems and allows for maximum utilage of that power tool.
According to the present invention there is provided a power tool system comprising a tool body having a motor with a direct rotary output and a detachable tool head, wherein the tool head comprises a drive mechanism for engagement with the motor output, said motor output comprising a first engagement means for complimentary engagement with a second engagement means on said head drive mechanism when said tool head is connected to said tool body, characterised in that said first engagement means is recessed within said body and accessible through an aperture in said body and said second engagement means is recessed within said tool head and accessible through a second aperture in said tool head.
Preferably, a tool wherein one of the tool head or the body is received through said aperture of the other of the tool head or body for the engagement means of said one of the other of said tool head or body to be received through the aperture of the one of the tool head or the body for said complimentary engagement to occur between the first and second engagement means within the one of the tool head or body.
Preferably, a tool in which the tool head has a spigot forming an internal chamber within which the second engagement means is recessed wherein said spigot and associated chamber are received within said body through said body aperture and said first engagement means is received within said tool head chamber.
Preferably, a tool in which first engagement means is housed within a substantially cylindrical chamber and the tool head has a substantially cylindrical spigot for a complimentary and co-axial fit within the cylindrical chamber of the body wherein both first and second engagement means are disposed on the axis of the cylindrical chamber and cylindrical spigot respectively to provide for automatic alignment of the first and second engagement means when said spigot is received within said cylindrical tool chamber.
It is preferred that a tool in which one of said first and second engagement means comprises a male cog and the other of said first and second engagement means comprises a female cog for receiving said male cog.
REFERENCES:
patent: 1965669 (1934-07-01), Robb
patent: 2815834 (1957-12-01), Mall
patent: 2884902 (1959-05-01), Headings
patent: 3724237 (1973-04-01), Wood
patent: 3759336 (1973-09-01), Marcovitz et al.
patent: 3901098 (1975-08-01), Jinkins
patent: 4030383 (1977-06-01), Wagner
patent: 5033552 (1991-07-01), Hu
patent: 5511912 (1996-04-01), Ellerbrook
patent: 5624000 (1997-04-01), Miller
patent: 5643062 (1997-07-01), Joseph et al.
Black & Decker Inc.
Calve Jim
Shapiro Bruce S.
Vo Peter
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