Rotary drum filtering apparatus and unitary drainage sectors therefor

Claim 2

A drum structure for rotary drum filtering apparatus, comprising an annular supporting drum and an annulus of drainage sectors mounted around the outer circumferential surface of said supporting drum, each of said sectors being of unitary construction and comprising integral wall means defining A drainage channel within the sector, said wall means of each said sector cooperating to cause the sector to be generally a ring sector in cross-section, said wall means of each sector including integral inner and outer walls on opposite sides of the said drainage channel of the sector and said inner and outer walls having sides remote from such drainage channel respectively bounding the inner and outer sides of the sector, said inner wall of each said sector being generally concave on its said side remote from the drainage channel and having its said side supported on the outer circumference of said supporting drum, said inner wall of each said sector being imperforate, said outer wall of each said sector being generally convex on its said side remote from the drainage channel, said outer wall of each said sector having drainage passage means therethrough in communication with the said drainage channel of the sector for draining fluid thereto, and each said sector including discharge passage means in communication with its said drainage channel for discharging fluid from the sector.

Claim 3

A drum structure according to claim 1, wherein at least one edge of a drainage channel of each said sector is closed by a laterally adjacent sector.

Claim 4

A drum structure according to claim 1, wherein pluralities of said sectors are disposed end to end with their drainage channels in communication with one another.

Claim 5

A drum structure according to claim 1, wherein said inner and outer walls of each said sector have sides respectively defining the inner and outer sides of the said drainage channel of the sector.

Claim 6

A drum structure according to claim 1, wherein a said drainage channel of each said sector is completely contained within the sector.

Claim 7

A drum structure for rotary drum filtering apparatus, comprising a supporting drum and annulus of drainage sectors mounted around the outer circumference of said drum, each said sector being of unitary plastic construction and comprising integral walls defining at least one drainage channel within the sector, said walls of each said sector cooperating to cause the sector to be generally a ring sector in cross-section and including integral inner and outer walls on opposite sides of the said drainage channel of the sector, said inner and outer walls of each said sector having sides remote from the drainage channel of the sector respectively bounding the inner and outer sides of the sector, each said outer wall being generally convex along its said side remote from said drainage channel and each said inner wall being imperforate and generally concave along its said side remote from said drainage channel, each said inner wall having its said side mounted arcuately around the outer circumference of said supporting drum, said inner and outer walls of each said sector being elongated longitudinally of said supporting drum to cause the sector to be elongated longitudinally of said drum, said outer wall of each said sector having drainage passage means therethough in communication with the said drainage channel of the sector for supplying liquid to the latter, and each said sector at one of its ends having discharge passage means in communication with its said drainage channel for discharging liquid from the sector.

Claim 8

A drum structure for rotary drum filtering apparatus, comprising a supporting drum and annulus of drainage sectors mounted around the outer circumference of said drum, each said sector being of unitary plastic construction and comprising integral walls defining at least one drainage channel within the sector, said walls of each said sector cooperating to cause the sector to be generally a ring sector in cross-section and including integral inner and outer walls on opposite sides of the said drainage channel of the sector, said inner and outer walls of each said sector having sides remote from the drainage channel of the sector respectively bounding the inner and outer sides of the sector, each said outer wall being generally convex along its said side remote from said drainage channel and each said inner wall being imperforate and generally concave along its said side remote from said drainage channel, each said inner wall having its said side mounted arcuately around the outer circumference of said supporting drum, said inner and outer walls of each said sector being elongated longitudinally of said supporting drum to cause the sector to be elongated longitudinally of said drum, said outer wall of each said sector having drainage passage means therethough in communication with the said drainage channel of the sector for supplying liquid to the latter, and each said sector at one of its ends having discharge passage means in communication with its said drainage channel for discharging liquid from the sector.

Claim 9

A drum structure according to claim 6, wherein at least one edge of a drainage channel of each said sector is closed by a laterally adjacent sector.

Claim 10

A drum structure according to claim 6, wherein pluralities of said sectors are disposed end to end with the drainage channels of the end to end sectors in communication with one another.

Claim 11

A drum structure according to claim 8, wherein said end to end sectors are interlocked one with another.

Claim 12

A drum structure according to claim 6, wherein a said drainage channel of each sector is completely enclosed within the sector.

Claim 13

A drum structure according to claim 6, wherein said convex side of said outer side wall of each said sector contains grooves communicAting with the said drainage passage means of the sector for supplying liquid thereto.

Claim 14

A drum structure according to claim 6, wherein said inner and outer walls of each said sector have sides respectively defining the inner and outer sides of the said drainage channel of the sector.

Claim 15

A drum structure according to claim 6, wherein said inner walls of said sectors and said supporting drum include keys and key receiving slots cooperative for mounting said sectors to said supporting drum.

Claim 16

A drum structure according to claim 13, wherein said inner walls include said key receiving slots and said supporting drum includes said keys.