Tool driving or impacting – Impacting devices – With means to reciprocate tool
Patent
1995-10-17
1998-03-10
Hail, III, Joseph J.
Tool driving or impacting
Impacting devices
With means to reciprocate tool
74 60, 30392, 30394, B23D 4904
Patent
active
057250588
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a hand tool with an apparatus housing in which two main portions are movably mounted, namely a rotary portion which is mounted in the housing by means of one or more bearing means, and a portion, which is non-rotatably but displaceably mounted in the housing, which is drivingly connected to the rotary portion, and is disposed to perform a reciprocating movement in its longitudinal direction as well as serving as a fixing means for a working tool, the rotary portion having a shaft oblique relative to the rotational axis of the rotary portion, on said oblique shaft there being mounted a motion transmitting means connected to an adjacent portion of the displaceable portion, said motion transmitting means transmitting, in the manner of a wobbler, the rotational movement of the rotary portion into a reciprocating movement of the displaceable portion.
2. Description of the Related Art
Hand tools of the above mentioned type are previously known, see e.g. U.S. Pat. No. 2,824,455 and U.S. Pat. No. 4,114,270, which describe a portable electrically driven hand saw and a hand-held apparatus for sawing slaughter-house products.
In the hand-held electric saw described in U.S. Pat. No. 2,824,455, the motion is transmitted between the motor-driven rotating portion and the reciprocating portion (in which the saw-blade is fixed) by motion transmitting means. The motion transmitting means consists of an arm element engaging the reciprocating portion, said element being mounted on the oblique crank with the aid of a ball bearing. The arm element consists of an annular housing surrounding the ball bearing with a housing portion projecting radially from the ball bearing in which there is solidly mounted a shank with a spherical head which engages in an engagement portion on the underside of the reciprocating part. A significant disadvantage of such a motion transmitting means (between the rotary portion and the reciprocating portion) is, however, that the motion transmitting means extends significantly radially from the oblique shaft.
This is because the arm element housing surrounding the ball bearing with the projecting housing portion, takes up in this context a significant space between the rotary part and the reciprocating part. These two parts can therefore not be mounted as close together as would be desirable in order to minimize the dimensions of the hand tool apparatus housing.
Especially when a hand-held power tool of the type in question is to be used for polishing, sanding, filing and similar operations in confined spaces, and when access to the place to be worked is limited or has small dimensions, it is essential that the dimensions, especially the transverse dimensions (the diameter), of the apparatus housing be kept down as much as possible.
SUMMARY OF THE INVENTION
The present invention therefore is intended to further develope hand tools of the type described by way of introduction, and to provide a hand tool, the apparatus housing of which has a small transverse dimension (maximum diameter), so that the hand tool may be easily handled.
The design should also be simple and reliable, and in particular the motion transmitting means should be compact and consist of few structurally simple machine elements which can be of standard type.
The hand tool should also be constructed so that the components subjected to wear should be few and easily replaced. The moving parts should further be so constructed and assembled that they engage without any undesirable play, thus eliminating rattle. The moving parts should also be able to be easily lubricated or be provided with the required lubrication upon assembly.
The above purposes are achieved effectively according to the invention by virtue of the fact that the motion transmitting means is a rolling bearing device mounted on the oblique shaft and comprising one or two rolling bearings, said bearing device having outer ring surface areas via which the device is in direct driving con
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patent: 5555626 (1996-09-01), Fuchs
Dentatus AB
Hail III Joseph J.
Stelacone Jay A.
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