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US 2009/0151530 A1Published application
Jamb saw
OwnerMichael L. Bradyinventor
Life of this patent
Estimating the term…
Abstract
A powered jamb saw is provided which is ideally suited for making corner cuts. A cylindrical housing for the shaft of the circular saw blade is mounted in a split bushing tensioned by a threaded bolt secured to and for rotation by a handle positioned so as to permit the workman to use both hands to position the jamb saw during its use in making cuts.
Claims7
A jamb saw comprising:
- a saw blade housing portion having
- a horizontally extending roof including
- an annular vertical opening having a first vertical axis,
- a pair of straight edges spaced equal distances from said annular vertical opening and disposed at a right angle to one another, said straight edges having diverging ends and converging ends, said converging ends terminating at equal distances from the theoretical point of convergence of said straight edges,
- a straight front edge interconnecting said converging ends of said straight edges and
- an annular edge concentric with said annular vertical opening interconnecting said diverging ends of said straight edges,
- a cylindrically shaped side wall rigidly secured to said annular edge of said roof and extending downwardly from said roof in a semi-circle configuration, said roof and said cylindrically shaped side wall forming a cavity for a circular saw blade, said cavity having a vertically open bottom and a horizontally open front between circumferentially opposite ends of said cylindrically shaped side wall and
- a first roller ball mounted in supporting relation to a circumferentially central portion of said cylindrically shaped side wall,
- a vertically split collar rigidly secured to the top of said roof including
- a cylindrically shaped vertical opening aligned with said annular vertical opening in said roof and
- a pair of circumferentially spaced confronting segments,
- a vertically adjustable cylindrical shaft housing mounted in said vertical openings of said split collar and said roof,
- a tensioning mechanism interposed between said confronting segments of said split collar operable to selectively contract said collar including a pivotable operating handle pivotable about a horizontal axis,
- a pair of roller support arms having
- first corresponding ends pivotally supported on said housing on second and third vertical axes spaced equal distances from said first vertical axis, and
- second corresponding ends,
- a support roller on each of said second corresponding ends of said support arms, said support rollers supporting said housing
- a biasing spring interposed between each of said arms and said housing urging said arms to extend radially outward in relation to said first vertical axis,
- a circle saw blade,
- a vertical shaft having upper and lower ends, said lower end being secured to said saw blade
- vertically spaced antifriction bearings interposed between said shaft and said shaft housing and
- a coupling component rigidly secured to the upper end of said shaft adapted for connection to a mating coupling on the output shaft of a hand supported power unit.
19 more elements
A jamb saw comprising:
- a saw blade housing including a horizontal roof and a cylindrically shaped side wall structure defining an open bottom, an open front, a closed rear side and partially open laterally opposite sides, said roof having a vertical annular opening,
- an upstanding bushing having
- a vertical bore aligned with said vertical annular opening and
- a vertically extending circumferential gap between circumferentially confronting segments, said bushing having a bottom portion not forming parts of said confronting segments, said bottom portion being rigidly secured to said roof,
- a vertically adjustable cylindrical shaft housing concentrically positioned in said vertical bore of said bushing,
- a vertical shaft rotatably mounted coaxially in said cylindrical shaft housing having an upper end adapted for a driving connection to an output shaft of a hand held power tool and a lower end extending downward into said housing,
- a circle saw blade secured coaxially to said lower end of said shaft,
- a support roller on said rear side of said housing,
- a pair of roller support arms having corresponding inward ends pivotally connected on vertical axes at laterally opposite portions of said blade housing and having corresponding outward ends,
- a support roller mounted on each of said corresponding outward ends of said roller support arms, and
- a threaded tension device connected to said confronting segments of said bushing including a tensioning handle pivotable about a horizontal and disposed for griping by a hand of a person using said jamb saw, said tension device being operable by said lever to control relative vertical movement between said bushing and said cylindrical shaft housing.
8 more elements
Dependencies are inferred from the claim text.