Alan B Hart

US Patent:

40043444, Jan 25, 1977

Filed:

Sep 4, 1975

Appl. No.:

5/610290

Inventors:

Gary K. Gold - Columbia MD
Alan H. Hart - Pikesville MD

International Classification:

A61C 110

US Classification:

32 27

Abstract:

A dental device for removing stains from teeth which includes a housing easily maintained, manipulatable, and operable in one hand of an operator. The housing includes a head member having a first internal chamber and a longitudinally extended handle member defining a second internal chamber. A motor is mounted within the first internal chamber of the head member and is directly connected in rotative displacement to a rubber cup stain removing element which is coupled to the motor external to the housing head member. In one form of the dental device the motor is electrically connected to a pair of batteries which are mounted within the second chamber of the handle member. Operation of the motor is provided by a switch which passes external to the housing and is actuated by one finger of the operator. When actuated, the switch completes an electrical path between the batteries and the motor in order to generate rotative displacement of the rubber cup which serves as the stain removal mechanism from the teeth of the user.

US Patent:

20140260737, Sep 18, 2014

Filed:

Mar 13, 2013

Appl. No.:

13/800851

Inventors:

- Waltham MA, US
Shane Olsen - Waltham MA, US
Michael Morrison - Waltham MA, US
Glenn Colvin, JR. - Waltham MA, US
Brian Maclean - Waltham MA, US
Alan Hart - Waltham MA, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

F16H 21/44

US Classification:

74102, 29428

Abstract:

A rotary actuation mechanism is disclosed. The rotary actuation mechanism can include an actuator having a body, and a slider movable on a linear path relative to the body. A first linkage can be pivotally coupled to the body at a first pivot having a first axis. A second linkage can be pivotally coupled to the slider at a second pivot having a second axis, and pivotally coupled to the first linkage at a third pivot. A length of the first linkage between the first pivot and the third pivot can be equal to a length of the second linkage between the second pivot and the third pivot. The slider can be movable to position the second axis in a collinear relationship with the first axis. The rotary actuation mechanism can include an anti-singularity device to constrain movement of the body when the first axis and the second axis are in the collinear relationship.