Dental drill handgrip

Claim 2

A dental drill handgrip for a rotatable dental tool comprising a housing, a drivable clamping mechanism for the rotating tool having an effective working portion and rotatably mounted in the housing, a protective shield partially surrounding the rotating tool at least along its effective working portion while leaving free an engagement region, means for mounting the protective shield so as to be freely pivotable at least over a portion of the periphery of the tool, said protective shield being provided at the side of the housing with a flange which protrudes radially with respect to the lengthwise axis of the tool, connecting element means cooperating with the flange for rotatably and detachably securing the protective shield with the housing, said connecting element means being provided with a collar member, and said flange of the protective shield being supported by means of axial ball bearings against the housing as well as against the collar member of the connecting element means.

Claim 3

A dental drill handgrip for a rotatable dental tool comprising a housing, a drivable clamping mechaniSm for the rotating tool having an effective working portion and rotatably mounted in the housing, a protective shield partially surrounding the rotating tool at least along its effective working portion while leaving free an engagement region, and means for mounting the protective shield so as to be freely pivotable at least over a portion of the periphery of the tool, said protective shield being provided with means for rotatably mounting a shank of the tool and means for securing the protective shield at the housing against entrainment during rotation of the tool, said securing means comprising holdback means arranged between the housing and the protective shield, and two stop means for limiting the range of movement of the holdback means in the peripheral direction of the tool.

Claim 4

A dental drill handgrip for a rotatable dental tool comprising a housing, a drivable clamping mechaniSm for the rotating tool having an effective working portion and rotatably mounted in the housing, a protective shield partially surrounding the rotating tool at least along its effective working portion while leaving free an engagement region, and means for mounting the protective shield so as to be freely pivotable at least over a portion of the periphery of the tool, said protective shield being provided with means for rotatably mounting a shank of the tool and means for securing the protective shield at the housing against entrainment during rotation of the tool, said securing means comprising holdback means arranged between the housing and the protective shield, and two stop means for limiting the range of movement of the holdback means in the peripheral direction of the tool.

Claim 5

A dental drill handgrip for a rotatable dental tool comprising a housing, a drivable clamping mechanism for the rotating tool having an effective working portion and rotatably mounted in the housing, a protective shield partially surrounding the rotating tool at least along its effective working portion while leaving free an engagement region, and means for mounting the protective shield so as to be freely pivotable at least over a portion of the periphery of the tool, said protective shield being provided with means for rotatably mounting a shank of the tool and means for securing the protective shield at the housing against entrainment during rotation of the tool, and wherein said rotatably mounting means comprises an intermediate ring member at which the protective shield is rotatably mounted, said intermediate ring member being rotatably secured to the shank of the tool, and holdback means for non-movably retaining the intermediate ring member relative to the housing.

Claim 6

A dental drill handgrip for a rotatable dental tool comprising a housing, a drivable clamping mechanism for the rotating tool having an effective working portion and rotatably mounted in the housing, a protective shield partially surrounding the rotating tool at least along its effective working portion while leaving free an engagement region, and means for mounting the protective shield so as to be freely pivotable at least over a portion of the periphery of the tool, said protective shield being provided with means for rotatably mounting a shank of the tool and means for securing the protective shield at the housing against entrainment during rotation of the tool, and wherein said rotatably mounting means comprises an intermediate ring member at which the protective shield is rotatably mounted, said intermediate ring member being rotatably secured to the shank of the tool, and holdback means for non-movably retaining the intermediate ring member relative to the housing.

Claim 7

The dental drill handgrip as defined in claim 3, wherein the intermediate ring member possesses throughpassage openings substantially extending in the direction of the tool.

Claim 8

A dental drill handgrip for a rotatable dental tool having a lengthwise extending axis of rotation and including an effective working portion, comprising a housing, a drivable clamping mechanism for the rotatable tool and rotatably mounted in said housing, a protective shield partially surrounding the rotatable tool and leaving exposed an engagement region of the effective working portion of the tool, means mounting the protective shield to be independent of the rotational movement of the tool, said protective shield embodying two interconnected side portions which are located approximately at diametrically opposed locations with respect to the axis of rotation of the tool, said diametrically opposed side portions including means forming with respect to the engagement region of the tool a rearwardly located free zone, said side portions each having a lower end which is blunt so that the protective shield does not injure a support location against which it bears during use of the dental drill handgrip.

Claim 9

A dental drill handgrip for a rotatable dental tool having a lengthwise extending axis of rotation and including an effective working portion, comprising a housing, a drivable clamping mechanism for the rotatable tool and rotatably mounted in said housing, a protective shield partially surrounding the rotatable tool and leaving exposed an engagement region of the effective working portion of the tool, means mounting the protective shield to be independent of the rotational movement of the tool, said protective shield embodying two interconnected side portions which are located approximately at diametrically opposed locations with respect to the axis of rotation of the tool, said diametrically opposed side portions including means forming with respect to the engagement region of the tool a rearwardly located free zone, said side portions each having a lower end which is blunt so that the protective shield does not injure a support location against which it bears during use of the dental drill handgrip.

Claim 10

The dental drill handgrip as defined in claim 5, wherein both of said side portions of the protective shield have a substantially flat construction and possess surfaces which are located adjacent the engagement region of the tool, said surfaces being substantially in alignment with one another.

Claim 11

The dental drill handgrip as defined in claim 5, wherein said side portions include outer edges bounding said rearwardly located free zone, said outer edges being disposed in an imaginary plane which is spaced from the periphery of the tool.

Claim 12

The dental drill handgrip as defined in claim 5, wherein said blunt lower end of each side portion comprises a respective protruding rounded sliding shoe, said shoes being disposed at diametrically opposed locations with respect to the lengthwise axis of the tool.

Claim 13

The dental drill handgrip as defined in claim 8, wherein the cross-section of each side portion decreases in the direction of the lower end thereof.

Claim 14

The dental drill handgrip as defined in claim 5, wherein the spacing of the Protective shield from the tool is increased in the direction of the clamping mechanism.

Claim 15

The dental drill handgrip as defined in claim 5, wherein the tool has a free end which when the tool is not in use at most extends up to the region of the lower end of the protective shield.

Claim 16

The dental drill handgrip as defined in claim 5, wherein said mounting means serves to mount the protective shield so as to be freely pivotable about the entire periphery of the tool.

Claim 17

The dental drill handgrip as defined in claim 5, wherein the protective shield possesses a flange which protrudes radially with respect to the axis of rotation of the tool, and a screw cap for rotatably and detachably securing the protective shield via the flange at the housing.

Claim 18

The dental drill handgrip as defined in claim 13, wherein the screw cap includes a flange, and axial ball bearing means for securing the flange of the protective shield both against the housing as well as against the flange of the screw cap.