Abrading – Frame or mount – Portable abrader
Reexamination Certificate
1999-11-19
2001-06-05
Hail, III, Joseph J. (Department: 3723)
Abrading
Frame or mount
Portable abrader
C451S357000, C081S177600, C081S177700, C081S177800, C081S177900
Reexamination Certificate
active
06241594
ABSTRACT:
The invention relates to a hand machine tool comprising an elongated housing, a drive motor which is arranged in the housing and with which a tool holder can be driven via a miter gear, a first handle unit arranged on a housing section located close to the tool holder and aligned transversely to a longitudinal axis of the housing and a second handle unit arranged on the housing.
Hand machine tools of this type are known from the state of the art. Hand machine tools of this type are, in many cases, designed as angle grinders which are provided for a plurality of grinding and cutting work.
In this respect, the handling capability of the machine tool is dependent on the alignment of the first handle unit relative to an axis of rotation of the tool holder.
The object underlying the invention is therefore to provide a hand machine tool, with which the alignment of the first handle unit relative to the axis of rotation of the tool holder can be varied.
This object is accomplished in accordance with the invention, in a hand machine tool of the type described at the outset, in that the first handle unit is held for guidance in an adjusting guide means on the housing and in this adjusting guide means can be adjusted within an angular range of at least 90° about the longitudinal axis of the housing between several possible positions and can be fixed in a positive-locking manner in the respective position.
The advantage of the inventive solution is to be seen in the fact that as a result of the guidance of the handle unit in the adjusting guide means a complete detachment of the handle unit from the housing is avoided during the adjustment and so the handle unit always remains in connection with the housing and, on the other hand, due to the positive-locking fixing the possibility is also created of securely fixing the handle unit in the intended position which is desirable for a good equipment safety of the hand machine tool since any undesired releasing of the handle unit in the respective position, which would be possible with a force-locking fixing, can thus be prevented.
A positive-locking fixing is thereby to be understood as all the possibilities for realizing this which provide for one positive-locking element to engage in another. In this respect, one of the positive-locking elements can, in the simplest case, be designed as a rippled or wavy surface, the other positive-locking element then engaging in its recesses with a nose.
The adjusting guide means may be designed in the most varied of ways.
One advantageous solution provides for the adjusting guide means to comprise a guide path guiding a guide member connected to the first handle unit in a positive-locking manner between the various positions.
In principle, it would be conceivable to design the guide path completely independently of the outer contour of the housing.
However, in order to be able to integrate the guide path into the housing in a simple manner it is preferably provided for the guide path to extend along an outer contour of the housing.
It is particularly advantageous when the guide path is arranged so as to be recessed in relation to the outer contour of the housing so that the guide path can be protected against any type of damage.
A particularly favorable design of the adjusting guide means provides for the adjusting guide means to have at least one guide bar which extends in the direction of guidance and behind which the guide member connected to the handle unit engages.
As a result, a particularly simple and functional adjusting guide means can be realized.
With respect to the possibilities for the positive-locking fixing of the handle unit in the various positions, no further details have so far been given. It would, for example, be possible to provide the positive-locking fixing separately from the guide path. It would, for example, be conceivable to arrange the positive-locking elements for the fixing of the handle unit in the various positions next to the guide path.
For reasons of space and for reasons of as simple a constructional solution as possible, it is particularly favorable when the guide bar is provided with a row of positive-locking elements which can be brought into engagement with corresponding positive-locking elements on the guide member connected to the first handle unit.
The guide member is, as a result, not only provided for the purpose of guiding the handle unit in the adjusting guide means but it is also used at the same time for the purpose of realizing the positive-locking connection in the respective positions.
In order to ensure that the positive-locking elements transfer into their positive-locking position and remain in it, a securing element is preferably provided which acts on the positive-locking elements in order to keep these in their positive-locking position and when they are not in their positive-locking position to transfer them into it.
A particularly simple design of such a securing element from a constructional point of view provides for this to comprise a retaining spring which acts on the positive-locking elements in such a manner that they transfer into their positive-locking position, and remain in this position.
With respect to the arrangement of the securing element, the most varied of possibilities are conceivable. For example, it would be conceivable to arrange the securing element as a separate element independent of the adjusting guide means. However, a particularly favorable solution provides for the securing element to be arranged so as to be supported on the adjusting guide means.
An alternative solution provides for the securing element to be arranged in the handle unit.
In order to ensure that the positive-locking elements transfer from their positive-locking position into their non-positive-locking position and thus the handle unit is movable in the adjusting guide means, it is necessary to provide an actuating element for the securing element. Such an actuating element could, for example, be an additional element provided in the handle unit, such as, for example, an actuating lever or an actuating knob.
A particularly simple solution from a constructional point of view provides for the securing element to be actuatable via a handle of the handle unit, for example, in the case of a retaining spring to be acted upon contrary to the force of the spring.
In conjunction with the preceding description of the individual embodiments, no further details have so far been given as to how the fixing of the first handle unit is intended to be brought about in the respective positions. It would, for example, be adequate, in order to hold the handle unit in this position, to fix it in a positive-locking manner in this position also with a certain play.
In order to facilitate a secure and precise working with the hand machine tool it is, however, particularly advantageous when the first handle unit can be positioned on the housing free from play in the respective position fixed in a positive-locking manner by means of a clamping device.
The advantage of this solution is to be seen in the fact that the positioning of the handle unit relative to the housing is indeed possible by way of the positive-locking fixing thereof but this positioning is still subject to play, wherein play does not have a disadvantageous effect on fundamental safety aspects which are realized by the adjusting guide means and the positive-locking fixing in the respective position. As a result of the additional fixing free from play by means of a clamping device the desired, rigid and precise alignment of the handle unit in relation to the housing is, however, ensured.
Such a clamping device may be realized in various ways. A particularly favorable solution provides for the clamping device to have a clamping element, with which a support element of the handle unit can be abutted against the housing in a clamped manner.
The clamping element which must itself engage on the housing in order to abut the support element on the housing in a clamped manner is preferably designed such that it engage
Flex-Elektrowerkzeuge
Hail III Joseph J.
McDonald Shantese
Merchant & Gould P.C.
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