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US 6,681,869 B2Granted
Hand held rotary-percussion tool with an electronic depth stop
AssigneeHilti Aktiengesellschaft
InventorsChristoph Würsch, Roland Schaer
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AssigneeHilti Aktiengesellschaft
InventorsChristoph Würsch, Roland Schaer
Estimating the term…
A hand-held rotary-percussion power tool includes an electrical drive (2) for generating a torque transmittable to a boring tool used with the power tool for forming blind bores, a hammer mechanism (3) for applying impacts to the boring tool, control device (7, 7′, 7″) for controlling operation of at least one of the electrical drive (2) and the hammer mechanism (3), and an electronic depth stop (4). The depth stop include a sensor (5) for contactless, distance measuring of a depth of a blind bore, and a computation unit (6) for generating a signal indicating that a sensed measurement value (M) corresponds to a set value of the depth of the blind bore, and connected with the control device (7, 7′, 7″).
A hand-held rotary-percussion borer comprising an electrical drive (2) for generating a torque transmittable to a boring tool used with the borer for forming blind bores;
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
Stops attached to drilling tools, tool holders or drilling machines: attached to drilling machines
Details of constructional elements: lasers
Turning
Term ended 1 Mar 2022 (estimated)
1. Field of the Invention
The present invention relates to a hand-held rotary-percussion tool such as e.g. a hammer drill and including an electronic depth stop.
2. Description of Prior Art
Single FIGURE of the drawings shows a side, partially cross-sectional view of a hand-held power tool with an electronic depth stop according to the present invention.
A hand-held power tool, which is shown in the drawing, includes an electrical drive 2, a pneumatic hammer mechanism 3, and a laser pulse-based, contactless, electronic depth stop 4. The electronic depth stop 4 has a sensor 5 and a computation unit 6 that generates a signal when the measurement value M corresponds to the set value. The computation unit 6 is operatively connected with control elements 7, 7′, and 7″. The control element 7 is formed as a phase-controllable current regulator arranged in the line 8 connecting the drive 2 with the current source. The control element 7 is additionally controlled by a pressure-actuated switch provided in the handle of the power tool 1. The control element 7′ is formed as an electrically controlled pneumatic valve arranged between a gas spring 9 of the hammer mechanism 3 and the surrounding the hammer mechanism 3, space 10. The control element 7″ is formed as an electrically controlled clutch provided between the electrical drive 2 and the hammer mechanism 3.
Though the present invention was shown and described with references to the preferred embodiment, such is merely illustrative of the present invention and is not to be construed as a limitation thereof, and various modifications to the present invention will be apparent to those skilled in the art. It is, therefore, not intended that the present invention be limited to the disclosed embodiment or details thereof, and the present invention includes all variations and/or alternative embodiments within the spirit and scope of the present invention as defined by the appended claims.