US 4,231,155 AGranted

Electrically powered paint scraping tool

OwnerBruce Johneinventor

Life of this patent

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Abstract

The object of the invention is to provide a portable hand operated electrically powered paint scraper compact, sturdy maneuverable and with a positive reliable drive to reciprocate a scraping blade the working surface of which may be both protected and regulated. Another object of the invention is to convert the rotary drive of an electric motor into a reciprocating motion of a blade holder with a dual drive linkage system. Another object of the invention is the provision of a dual linkage drive system which will apply maximum thrust to the working blade and working thrust even should one of the linkage units of the drive fail. A further object of the invention is the provision of a tool as above described including its own internal blower system to cause material removed by the blade to be blown away from the work area.

Claims7

Dependent claims

An electric paint scraping tool comprising:

(a) a support casement,
(b) an electric motor mounted in said casement having a rotary drive shaft extending therefrom,
(c) a worm gear secured to said drive shaft,
(d) a pair of worm pinions in mesh with said worm gear,
(e) a pair of primary arms pivotally mounted to said casement and connected to be driven by said worm pinions at one side of said pivot and having a slotted end at the other side of said pivot,
(f) a blade holder member,
(g) a pair of L-shaped bell crank secondary arms pivotally mounted to said blade holder member proximate the juncture of the leg and foot of said L-shaped bell crank and connected to reciprocatingly drive said blade holder member,
(h) said secondary bell crank arms being connected to be driven by said primary arms,
(i) a razor blade mounted on the free end of blade holder member,
(j) a blade limiting guard adjustably mounted on said casement and positioned to limit the operating surface of the blade to protect support surfaces of the area to be cleaned by said razor blade,
(k) and trigger switch means carried by said casement and connected in circuit with said electric motor to start and stop said motor.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/037,664Filed 10 May 1979
Granted: 4 Nov 1980
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

A47L 11/4036
Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles,…: parts or…
A47L 11/12
Motor-driven: with reciprocating or oscillating tools
A47L 11/4069
Driving means; Transmission means therefor: driving or transmission means for the cleaning tools
A47L 11/4075
Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles,…: handles;…