US3894254A — Electric motor power unit

Claim 1

Independent Claim 126 words

An electric motor power unit for driving a concrete vibrator comprising, a casing housing the motor, a handle support of resilient material encircling and secured to said casing and having pats thereof at a distance from the casing, a handle of a quadrilateral shape at a distance from the casing and having a plurality of sides defining four corners therebetween which corners are in alignment with the parts of the handle support, each of said handle sides being of a length to permit engagement thereof by the hand of an operator, a plurality of elongate frame members fitted into said parts and the handle at said corners to define a protective enclosure for the unit and with said handle support provide a mounting for said handle.

Claim 2

Dependent Claim 126 words

An electric motor power unit for driving a concrete vibrator comprising, a casing housing the motor, a handle support of resilient material encircling and secured to said casing and having pats thereof at a distance from the casing, a handle of a quadrilateral shape at a distance from the casing and having a plurality of sides defining four corners therebetween which corners are in alignment with the parts of the handle support, each of said handle sides being of a length to permit engagement thereof by the hand of an operator, a plurality of elongate frame members fitted into said parts and the handle at said corners to define a protective enclosure for the unit and with said handle support provide a mounting for said handle.

Claim 3

Dependent Claim 33 words

An electric motor power unit as defined in claim 1 wherein said casing is formed of plural parts and said handle support is held in position by fitting between parts of said casing.

Claim 4

Dependent Claim 36 words

An electric motor power unit as defined in claim 1 wherein an operating switch for the motor extends from an end of the casing adjacent said handle for manual operation by a hand engaging said handle.

Claim 5

Dependent Claim 45 words

An electric motor power unit as defined in claim 3 wherein the casing has an end cap, said end cap engaging and holding said operating switch in assembled position, and a plurality of passages in said end cap for passage of air to said motor.

Claim 6

Dependent Claim 39 words

An electric motor power unit as defined in claim 1 wherein the casing has an end cap, means removably attaching said end cap to the casing, and a plurality of brush holders for the motor enclosed by the end.

Claim 7

Dependent Claim 43 words

An electric motor power unit as defined in claim 5 wherein each of said brush holders includes a brush retainer pivotally mounted to the brush holder and movable to and from a position closing off a brush holding chamber in the brush holder.

Claim 8

Dependent Claim 112 words

An electric motor power unit having a casing enclosing a motor, a motor housing, a pair of brush holders positioned in slots in the motor housing and each having a top wall with an alignment notch therein, means holding the brush holders in assembled relation with the motor housing including a pair of planar clamp strips engageable one in each of said notches, and a pair of fasteners securing each of said clamp strips to the motor housing, and a brush retainer pivotally mounted to one of said fasteners for movement between a brush holding position across an end of the brush holder and a second position permitting removal of a brush.

Claim 9

Dependent Claim 112 words

An electric motor power unit having a casing enclosing a motor, a motor housing, a pair of brush holders positioned in slots in the motor housing and each having a top wall with an alignment notch therein, means holding the brush holders in assembled relation with the motor housing including a pair of planar clamp strips engageable one in each of said notches, and a pair of fasteners securing each of said clamp strips to the motor housing, and a brush retainer pivotally mounted to one of said fasteners for movement between a brush holding position across an end of the brush holder and a second position permitting removal of a brush.

Claim 10

Dependent Claim 46 words

An electric motor power unit as defined in claim 7 wherein the fastener to which the brush retainer is pivoted is a member threaded to the motor housing for adjustment to either tightly hold the brush retainer in brush holding position or to permit pivoting thereof.

Claim 11

Dependent Claim 128 words

An electric motor power unit for driving a tool comprising, a two-part casing housing a motor, an annular handle support member of resilient electrically non-conducting material captured between the parts of the casing and having four parts projecting a distance from the casing and with an opening through each part, a plurality of elongate tubular frame members extending one through each of said openings to locations beyond the opposite ends of the casing, and a quadrilateral handle having four corners with a recess at each corner to receive an elongate frame member, and means for securing said frame members to said handle support member and to the handle, said handle having a plurality of sides each of a length to permit engagement by a hand of an operator.

Claim 12

Dependent Claim 128 words

An electric motor power unit for driving a tool comprising, a two-part casing housing a motor, an annular handle support member of resilient electrically non-conducting material captured between the parts of the casing and having four parts projecting a distance from the casing and with an opening through each part, a plurality of elongate tubular frame members extending one through each of said openings to locations beyond the opposite ends of the casing, and a quadrilateral handle having four corners with a recess at each corner to receive an elongate frame member, and means for securing said frame members to said handle support member and to the handle, said handle having a plurality of sides each of a length to permit engagement by a hand of an operator.

Claim 13

Dependent Claim 127 words

An electric motor power unit as defined in claim 9 including a motor, switch means for operating the motor, a power cord extending into the casing and connected to the switch, and means for securing the power cord to the casing including a member having a concave recess to curvingly receive a portion of the power cord, a bracket engageable against the power cord, means for tightening the bracket against the power cord to firmly urge the power cord into said concave recess, and an annular grommet secured to said power cord with a peripheral groove therein and with ribs on a part of the casing and an end cap for the casing to engage in said peripheral groove and securely lock the grommet to the casing.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-07-07	1979-01-06	1979-07-08	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-07-07	1983-01-06	1983-07-08	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-07-07	1987-01-06	1987-07-08	$7700.00	Window Closed / Lapsed

Electric motor power unit

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