Back to results
US 4,604,920 AGranted
Filter wrench
OwnerConrad E. Dupkeinventor
Life of this patent
Estimating the term…
Abstract
A band or ring, split at one point in its circumference, forming end portions directed toward each other. A pair of handles are welded to the band, at the end portions, each at points distributed over substantial length of the band. The band is of work hardened steel, and knurled on its inner surface. The steel band is self-biased to an outer or enlarged size, and contractible to an inner or smaller size by squeezing on the handles, for gripping an object.
Claims8
A filter wrench comprising,
- a curved band in a near-circle shape, and having an axis, and radial and circumferential directions according to a circle,
- the band including end portions having end surfaces directed toward each other, and otherwise being continuous from one end to the other,
- the band being of uniform cross sectional shape between points closely adjacent the end surfaces, and being of uniform thickness throughout,
- the band being self spring biased to an outer position of large size and capable of being flexed to an inner position of small size,
- the band being of great thickness whereby in moving between its said positions, the band does not bend in localized areas, but all bending takes place as a continuous and progressive action distributed throughout the length of the band, whereby in said positions, and positions therebetween, the band maintains its near-circle shape, and
- handles secured to the band at the end portions thereof, and extending generally radially therefrom, the handles being rigid, and capable, when gripped in the hand and moved toward each other in circumferential direction, of contracting the band to its inner position,
- the handles being rigidly secured to the band each at points spaced apart a substantial distance circumferentially of the band, whereby in response to the handles being moved toward each other, the band is capable of withstanding deformation at the junctures of the handles and the band.
4 more elements
A filter wrench comprising,
- a curved band in a near-circle shape, and having an axis, and radial and circumferential directions according to a circle,
- the band having end portions directed toward each other, and
- handles secured to the band at the end portions thereof, and extending generally radially therefrom,
- the band being of rigid material, and being self spring biased to an outer position,
- the handles being rigid, and rigidly secured to the band, and capable, in response to being moved toward each other in circumferential direction, for contracting the band into an inner position,
- the band has terminal elements at said end portions that overlap in circumferential direction at least in said inner position of the band.
3 more elements
A filter wrench comprising,
- a curved band in a near-circle shape, and having an axis, and radial and circumferential directions according to a circle,
- the band having end portions directed toward each other, and
- handles secured to the band at the end portions thereof, and extending generally radially therefrom,
- the band being of rigid material, and being self spring biased to an outer position,
- the handles being rigid, and rigidly secured to the band, and capable, in response to being moved toward each other in circumferential direction, for contracting the band into an inner position,
- the band has terminal elements at said end portions that overlap in circumferential direction at least in said inner position of the band,
- said end portions have circumferential end surfaces positioned at an acute angle to said axis, as viewed radially, whereby to provide pointed elements constituting said terminal elements.
4 more elements
Dependencies are inferred from the claim text.