Electric toothbrush
AssigneePanasonic Corporation
InventorsTadanobu Kitagawa, Yoshihiro Kitamura
Life of this patent
Estimating the term…
Abstract
An elastic ring is disposed between a grip case and a trunk which is formed on an inner case of a body case to which a toothbrush head is mounted. As a result, the vibration of a motor which is contained in a motor accommodation portion of the inner case is less likely to be transmitted to the grip because of the elastic ring, and is transmitted to the toothbrush head side in a concentrated manner. Also, the tooth cleaning performance is increased, and vibration to the hand which grips the grip case is reduced to enable the user to comfortably brush the teeth.
Claims27
An electric toothbrush comprising:
- an oscillation generator formed by a motor including an eccentric weight;
- a main body case including a motor accommodation portion, which accommodates the motor at a distal side, and a battery accommodation portion, which accommodates a motor driving battery at a basal side;
- a toothbrush head attached in a removable manner to a distal end portion of the main body case;
- a grip case that receives a basal end portion of the main body case and accommodates the battery accommodation portion;
- a cap that receives the toothbrush head, which is attached to the main body case, includes an open end face that comes into contact with an open end face of the grip case, and accommodates the toothbrush head;
- and
- an elastic member arranged between the grip case and the main body case, which is received by the grip case.
An electric toothbrush comprising:
- a toothbrush head including brush bristles;
- a main body case to which the toothbrush head is attached in a removable manner;
- a motor arranged in the main body case to apply oscillation to the toothbrush head;
- a switch arranged in an outer wall of the main body case to start or stop driving the motor;
- a grip case attached to a basal end portion of the main body case;
- and
- a transmission member arranged between the main body case and the motor to transmit oscillation of the motor to the main body case,
- wherein the switch is arranged in the main body case at a portion opposite to a side of the transmission member with respect to a central axis of the grip case.
An electric toothbrush including a main body case, which accommodates a motor that serves as an oscillation source, and a toothbrush head, which is attached to a distal end portion of the main body case and has brush bristles embedded therein, and a grip case, which is attached to a basal end portion of the main body case that is an end portion opposite to the distal end portion of the main body case, the electric toothbrush being characterized in that
- when a cross-sectional plane that includes a rotation shaft of the motor and the brush bristles and is parallel to the rotation shaft of the motor defines a cross-sectional side plane, a side of a center axis of the grip case including a distal end portion of the brush bristles in the cross-sectional side plane is defined as a front side, a side of the center axis of the grip case opposite to the front side in the cross-sectional side plane defines a rear side, a wall at a front side of the main body case in the cross-sectional side plane is defined as a front wall, and a wall at a rear side of the main body case in the cross-sectional side plane is defined as a rear wall, a length of a portion in the front wall that directly faces the grip case is represented by length P, a length of a portion in the rear wall of the inner case that directly faces the grip case is represented by length Q;
- the length Q is less than the length P.
An electric toothbrush including:
- a main body case that accommodates a motor serving as an oscillation source;
- a toothbrush head attached to the main body case;
- and
- a grip case attached to a basal end portion of the main body case, the electric toothbrush being characterized by
- a brush attachment shaft tube, which is used to attach the toothbrush head, is arranged in a distal end portion of the main body case, and the brush attachment shaft tube includes a distal end portion closed by a top wall.
Dependencies are inferred from the claim text.