Toothbrush oscillating head
First Claim
Patent Images
1. A bristle head oscillation mechanism for an electrically driven toothbrush comprising:
- (i) an elongate housing having a drive shaft rotatably mounted therein;
(ii) a bristle head rotatably disposed at an end of said elongate housing and (iii) a pivot arm pivotable about a pivot axis depending from said housing, one end of said pivot arm forming a drive slot coupled to an off set end of said drive shaft thereby coupling said pivot arm to said drive shaft and a coupling on an opposing end of said pivot arm adapted to engage said bristle head, said coupling including a drive pin and a mating drive slot, wherein said pivot arm has a first length characterising the distance between the pivot arm coupling to said bristle head and said pivot axis and a second length characterising the distance between the pivot arm coupling to said drive shaft and said pivot axis such that the first length is greater than the second length whereby rotation of said drive shaft pivots said pivot arm to effect oscillation of said bristle head in relation to said elongate housing.
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Abstract
Discloses a bristle head oscillation mechanism for an electrically driven toothbrush. A toothbrush bristle head is rotatably disposed at an end of an elongate housing. A drive shaft is rotatably disposed in the elongate housing and has an offset end coupled to one end of a pivot arm. The other end of the pivot arm is coupled to the toothbrush bristle head. Rotation of the drive shaft pivots the pivot arm to effect oscillation of the bristle head with respect to the elongate housing.
81 Citations
24 Claims
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1. A bristle head oscillation mechanism for an electrically driven toothbrush comprising:
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(i) an elongate housing having a drive shaft rotatably mounted therein;
(ii) a bristle head rotatably disposed at an end of said elongate housing and (iii) a pivot arm pivotable about a pivot axis depending from said housing, one end of said pivot arm forming a drive slot coupled to an off set end of said drive shaft thereby coupling said pivot arm to said drive shaft and a coupling on an opposing end of said pivot arm adapted to engage said bristle head, said coupling including a drive pin and a mating drive slot, wherein said pivot arm has a first length characterising the distance between the pivot arm coupling to said bristle head and said pivot axis and a second length characterising the distance between the pivot arm coupling to said drive shaft and said pivot axis such that the first length is greater than the second length whereby rotation of said drive shaft pivots said pivot arm to effect oscillation of said bristle head in relation to said elongate housing. - View Dependent Claims (2, 3, 4, 5)
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6. A bristle head oscillation mechanism for an electrically driven toothbrush comprising:
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(i) an elongate housing having a drive shaft rotatably mounted therein;
(ii) a bristle head rotatably disposed at an end of said elongate housing and (iii) a pivot arm pivotable about a pivot axis depending from said housing, one end of said pivot arm forming a drive slot coupled to an off set end of said drive shaft thereby coupling said pivot.arm to said drive shaft and a drive pin extending from an opposing end of said pivot arm to engage a mating drive slot formed in said bristle head to couple said pivot arm to said bristle head, wherein said pivot arm has a first length characterising the distance between the pivot arm coupling to said bristle head and said pivot axis and a second length characterising the distance between the pivot arm coupling to said drive shaft and said pivot axis such that the first length is greater than the second length whereby rotation of said drive shaft pivots said pivot arm to effect oscillation of said bristle head in relation to said elongate housing. - View Dependent Claims (7, 8, 9)
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10. A bristle head oscillation mechanism for an electrically driven toothbrush comprising:
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(i) an elongate housing having a drive shaft rotatably mounted therein;
(ii) a bristle head rotatably disposed about a bristle head axis at an end of said elongate housing and (iii) a pivot arm pivotable about a pivot axis depending from said housing, one end of said pivot arm forming a drive slot coupled to an off set end of said drive shaft thereby coupling said pivot arm to said drive shaft and a coupling on an opposing end of said pivot arm adapted to engage said bristle head between said bristle head axis and said pivot axis, said coupling including a drive pin slideably engaging a mating drive slot, whereby rotation of said drive shaft pivots said pivot arm to effect oscillation of said bristle head in relation to said elongate housing. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A bristle head oscillation mechanism for an electrically driven toothbrush comprising:
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(i) an elongate housing having a drive shaft rotatably mounted therein;
(ii) a bristle head rotatably disposed about a bristle head axis at an end of said elongate housing and (iii) a pivot arm pivotable about a pivot axis depending from said housing, one end of said pivot arm forming a drive slot coupled to an off set end of said drive shaft thereby coupling said pivot arm to said drive shaft and a drive pin extending from an opposing end of said pivot arm to slideably engage a mating drive slot formed in said bristle head between said bristle head axis and said pivot axis at a selected distance from said bristle head axis to couple said pivot arm to said bristle head, whereby rotation of said drive shaft pivots said pivot arm to effect oscillation of said bristle head in relation to said elongate housing facilitating an optimal torque to be applied to said bristle head. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification