Plunge type router
AssigneeBlack & Decker Inc.
InventorWilliam A. George
Life of this patent
Estimating the term…
Abstract
A plunge type router is disclosed which includes a base housing having a work engaging surface and an upper portion within which a driving motor is supportingly mounted for reciprocable movement with respect thereto. A pair of extension coil springs are provided extending between a first pair of projections provided on the upper portion of the base housing and a second pair of projections secured to the motor housing which operate to continuously bias the driving motor into a retracted position. The extension springs are arranged in the form of loops positioned on opposite sides of the router and are concealed and protected by a pair of handles secured to the motor housing which handles are movable therewith.
Claims12
In a plunge type router including a base housing having an upper portion, a bore extending through said upper portion, a lower flange portion including a work engaging lower surface, a driving motor assembly including a motor housing extending into said bore, said driving motor assembly including a driving shaft extending outwardly from the lower end of said motor housing, chuck means secured to said shaft for attaching a cutting tool to said shaft, said motor housing being reciprocably movable with respect to said base housing between a retracted position in which said cutting tool is positioned above said work engaging surface and an extended position in which said cutting tool projects downwardly below said work engaging surface, improved means for biasing said motor housing into a retracted position comprising first attaching means provided on said base housing;
- said base housing including an elongated slot having a longitudinal axis extending generally parallel to the direction of movement of said motor housing;
- second attaching means provided on said motor housing;
- said second attaching means including stop means engageable with a portion of said base housing for limiting movement of said motor assembly with respect thereto;
- said stop means comprising a bushing member received within said slot and engageable with opposite longitudinal ends thereof;
- and biasing means extending between said first and second attaching means and operative to bias said motor housing into said retracted position.
In a plunge type router including a base housing having an upper portion, a bore extending through said upper portion, a lower flange portion having a work engaging lower surface, a driving motor assembly including a motor housing extending into said bore, said driving motor assembly including a driving shaft extending outwardly from the lower end of said motor housing, chuck means secured to said shaft for attaching a cutting tool to said shaft, said motor housing being reciprocably movable with respect to said base housing between a retracted position in which said cutting tool is positioned above said work engaging surface and an extended position in which said cutting tool projects downwardly below said work engaging surface, improved means for biasing said motor housing into a retracted position comprising:
- a first pair of projections positioned in substantially diametrically opposed relationship and extending generally radially outwardly from said base housing;
- a second pair of projections secured in substantially diametrically opposed relationship to said motor housing and projecting generally radially outwardly therefrom, said second pair of projections projecting outwardly through openings provided in said base housing and being positioned below said first pair of projections;
- a pair of extension springs each being connected between one of said first pair of projections and one of said second pair of projections, said extension spring being operative to bias said motor aasembly toward said retracted position;
- and
- a pair of handle means secured to said motor asembly, one of said handle means overlying and protecting each of said pair of extension springs.
Dependencies are inferred from the claim text.