US3844360A — Hand held power tool with duplex handle

Claim 1

Independent Claim 289 words

In a hand held power tool comprising a power unit having a front and a rear, said power unit comprising a casing and a motor in the casing and having speed control means, and a tool unit disposed at the front of the power unit and driven by said power unit, means for manually holding and controlling said power tool comprising a first handle disposed transversely at the front of the power unit and a second handle extending over the power unit from the rear toward the front thereof, said second handle having two separate hand grip portions arranged in tandem, namely a forward hand grip portion comprising a forward portion of said second handle and located approximately over the center of gravity of the power tool and a rearward hand grip portion comprising a separate rearward portion of said second handle and located wholly rearwardly of said forward hand grip portion and rearwardly of the center of gravity of the power tool, first motor control means at the forward end of the forward hand grip portion of said second handle in position to be digitally operated by an operator holding said forward hand grip portion, second motor control means forward of the rearward hand grip portion of said second handle in position to be digitally operated by an operator holding said rearward hand grip portion, said second motor control means being located between said forward hand grip portion and said rearward hand grip portion and means connecting said first and second motor control means with said second control means of the motor, whereby said motor can be controlled by an operator holding said second handle by either said forward hand grip portion or said rearward hand grip portion.

Claim 2

Dependent Claim 289 words

In a hand held power tool comprising a power unit having a front and a rear, said power unit comprising a casing and a motor in the casing and having speed control means, and a tool unit disposed at the front of the power unit and driven by said power unit, means for manually holding and controlling said power tool comprising a first handle disposed transversely at the front of the power unit and a second handle extending over the power unit from the rear toward the front thereof, said second handle having two separate hand grip portions arranged in tandem, namely a forward hand grip portion comprising a forward portion of said second handle and located approximately over the center of gravity of the power tool and a rearward hand grip portion comprising a separate rearward portion of said second handle and located wholly rearwardly of said forward hand grip portion and rearwardly of the center of gravity of the power tool, first motor control means at the forward end of the forward hand grip portion of said second handle in position to be digitally operated by an operator holding said forward hand grip portion, second motor control means forward of the rearward hand grip portion of said second handle in position to be digitally operated by an operator holding said rearward hand grip portion, said second motor control means being located between said forward hand grip portion and said rearward hand grip portion and means connecting said first and second motor control means with said second control means of the motor, whereby said motor can be controlled by an operator holding said second handle by either said forward hand grip portion or said rearward hand grip portion.

Claim 3

Dependent Claim 43 words

A power tool according to claim 1, wherein said second handle is contoured to define said forward and rearward hand grip portions so that an operator can properly position his hand on one or the other of said hand grip portions by feel.

Claim 4

Dependent Claim 19 words

A power tool according to claim 1, wherein said second handle extends rearwardly beyond the rear of the casing.

Claim 5

Dependent Claim 25 words

A power tool according to claim 1, wherein said second handle is hollow and said connecting means is disposed in part in said hollow handle.

Claim 6

Dependent Claim 30 words

A power tool according to claim 4, wherein said second handle comprises a lower portion which is integral with said casing and a cover removable secured on said lower portion.

Claim 7

Dependent Claim 34 words

A power tool according to claim 5, wherein said cover is molded plastic material and is provided at opposite ends with integral hooking portions which hook onto said lower portion to secure the cover.

Claim 8

Dependent Claim 80 words

A power tool according to claim 5, wherein said second motor control means comprises a trigger having a pivot portion, and wherein said lower portion of the second handle has means for receiving said pivot portion to pivotally support said trigger and said cover has means for retaining said pivot portion in said receiving means whereby said trigger can be assembled merely by dropping it into the lower portion of said second handle and thereafter securing said cover in place.

Claim 9

Dependent Claim 62 words

A power tool according to claim 7, wherein said connecting means comprises a connecting rod extending forwardly in said second handle from said trigger, said lower portion and cover of said second handle having cooperating means for guiding said connecting rod, whereby said connecting rod can be assembled by dropping it into said lower portion and thereafter securing said cover in place.

Claim 10

Dependent Claim 108 words

A power tool according to claim 8, wherein said first motor control means comprises a movable trigger, and wherein said connecting means further comprises a pivoted lever having a portion engageable by said connecting rod, a portion engageable with said trigger of the forward hand grip portion and a portion connected with said speed control means of the motor, said lower portion of the second handle having means for guiding said last mentioned trigger and for pivotally supporting said lever, whereby said last mentioned trigger and lever can be assembled by dropping them into said lower portion of the second handle and thereafter securing said cover in place.

Claim 11

Dependent Claim 89 words

A power tool according to claim 4, wherein said first motor control means comprises a first trigger movably mounted in said second handle and having a rest position in which a portion thereof extends below said second handle at the forward end of said forward hand grip portion, and said second motor control means comprises a second trigger movably mounted in said second handle and having a rest position in which a portion thereof extends below said second handle at the forward end of said rearward hand grip portion.

Claim 12

Dependent Claim 49 words

A power tool according to claim 10, wherein said connecting means comprises means operably connecting both of said triggers to said motor speed control means for operation of said speed control means by either one of said triggers while the other of said triggers remains in its rest position.

Claim 13

Dependent Claim 93 words

A power tool according to claim 11, wherein said connecting means comprises a lever pivotally mounted at the front of said second handle, means connecting said lever with said motor speed control means, said lever having a portion engageable by said first trigger to pivot said lever in a direction to operate said speed control means and a connecting rod in said hollow handle and movable by said second trigger, said rod being engageable with a portion of said lever to pivot said lever in a direction to operate said speed control means.

Claim 14

Dependent Claim 33 words

A power tool according to claim 1, wherein said motor is an internal combustion engine and said speed control means comprises a carburetor having a throttle to which said connecting means is connected.

Claim 15

Dependent Claim 45 words

A power tool according to claim 13, wherein said carburetor has a choke valve and a choke valve operating member located adjacent said forward hand grip portion of said second handle in position to be digitally operated by an operator holding said forward handle portion.

Claim 16

Dependent Claim 53 words

A power tool according to claim 13, wherein said engine has an on-off switch located at the top of said casing below a median portion of said second handle in position where it can be actuated by an operator holding said second handle by either said forward or said rearward hand grip portion.

Claim 17

Dependent Claim 57 words

A power tool according to claim 1, wherein said first handle comprises a tubular handle disposed generally in a plane perpendicular to a fore-aft axis of the power unit and having an approximately horizontal upper portion above the forward portion of the power unit and an approximately vertical side portion at one side of the power unit.

Claim 18

Dependent Claim 41 words

A power unit according to claim 16, wherein one end of said first handle is connected to second handle at its forward end and the opposite end of said first handle is connected to a lower rear portion of said casing.

Claim 19

Dependent Claim 78 words

A power unit according to claim 1, wherein said power tool is a chain saw and has a cutter bar extending forwardly from said power unit and spikes on the front of said casing in position to be engageable with the work, whereby said second handle when held by the rearward hand grip portion affords leverage to pivot said chain saw about said spikes in engagement with the work and thereby move said cutter bar into the work.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1977-10-28	1978-04-29	1978-10-29	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1981-10-28	1982-04-29	1982-10-29	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1985-10-28	1986-04-29	1986-10-29	$7700.00	Window Closed / Lapsed

Hand held power tool with duplex handle

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag