Assembling and energizing compact motors

A device for simultaneously achieving a mechanical engagement of a motor with a housing of an instrument for containing said motor to utilize its rotation output and an electric connection for feeding power to the motor, comprising

• power feeding means consisting of motor input terminals projected out of the motor body and current source power feeding terminals fixed engageably in contact with said motor input terminals in the positions on the inner surface of the housing to which the motor is to be fitted,
• means for fixing a motor in the direction of projecting motor power feeding terminals consisting of a first engaging element on the motor side having an engaging surface extended at least from the same surface of the motor out of which said motor input terminals project and facing the surface of the motor so as to define a space with a distance from said motor surface and a first engaging element on the housing side which is extended from the inner surface side of the housing and fill said space in the extending direction by that when the extended end surface contacts said surface of the motor, the other engaging surface facing the housing side will contact the engaging surface of said first engaging element on the motor side, and
• means for preventing rotations of the motor in said rectangularly intersecting direction consisting of a second engaging element on the motor side having at least one engaging surface extending at least in the direction of intersecting at right angles with the projecting direction of said motor input terminals at least on the same surface of the motor out of which said motor input terminals project and a second engaging element on the housing side engageably arranged on the engaging surface with said second engaging element on the motor side,
• wherein the terminals and engaging elements on the motor and housing sides of said power feeding, fixing and rotation preventing means are brought into an engageable relation with each other by the movement of the motor to the motor fitting position of said housing in the direction of projecting the motor input terminals.

A compact rotary instrument comprising a housing to be opened and closed with a lid at least in one direction, a substantially cylindrical motor contained within said housing and fitted in a position facing said lid, switching means contained in said housing to switch ON or OFF an electric power at least to said motor, a current source cord connected to said switching means and led out of the housing, at least one loading means contained in said housing, said loading means being connected to the output terminal of a rotary shaft of said motor, power feeding wires each connected at one end to said switching means and at the other end at least to said motor, and means for fitting said motor to the housing, and simultaneously connecting said motor to said feeding wires,

• said motor fitting, power feeding and connecting means consisting of an engaging element provided on one axial end surface of the motor, a pair of input terminals projected in the axial direction from the end surfaces symmetrically in the diametrical direction of said motor end surface, an engaging element provided on the inner surface facing said lid of the housing and resilient power feeding terminals each connected at one end to said power feeding wire and arranged at the other end to oppose to the other,
• said motor engaging element consisting of a pair of outward projections extended to intersect at right angles with the motor axis and arranged symmetrically in the diametrical direction of said motor end surface which intersects at right angles with the diametrical direction of said pair of input terminals and a pair of recesses provided in the positions aligned with the diametrical direction of said outward projections,
• said housing engaging element consisting of a pair of inward projections arranged to oppose to each other in the symmetrical positions with respect to the opposing center of said pair of power feeding terminals on the line passing through said opposed center and intersecting at right angles with said opposing direction and at least one member which enables the extended end from the inner surface of the housing with at least one of said pair of recesses of the motor on the line intersecting at right angles with said inward projections and
• said engaging elements and terminals of the motor and housing being so arranged as to approach mutually when the motor is inserted into the housing from which the lid is removed with the end surface of the motor directed toward the inner surface of the housing so that the respective arranging directions of the outward projections of the motor and the inward projections of the housing intersect at right angles with each other, and then the motor is rotated by about 90 degrees in one of the peripheral directions, whereby the outward projections of the motor will engage with the inward projections of the housing, the engaging member of the housing will engage with the recesses of the motor, the movements of the motor, in the axial and peripheral directions will be prevented, thus the motor will be fitted to the housing and, at the same time, the input terminals of the motor will engage in contact with the power feeding terminals of the housing.