US4396408A — Method and apparatus for tensioning bag filters

Claim 1

Independent Claim 192 words

In an inside to outside dust collector having a bag support frame and a cell plate to which is connected one end of a fabric sleeve filter, in combination, a tensioning bag retainer comprising: (a) a circular bag support member which carries, in sealing engagement therewith, the other end of said fabric sleeve filter; (b) an elongate shaft secured to said bag support member and extending upwardly through said bag support frame, said elongate shaft including a plurality of spaced holes bored laterally through said shaft in the portion thereof extending above said bag support frame; (c) compressible tension means received on said elongate shaft which projects above said bag support frame, said tension means including spring means received on said elongate shaft; (d) an adjustable pin removably disposed through one said hole of said shaft above said spring means whereby said spring means is captured between said pin and said bag support frame and said spring means acts against said pin to apply tension to said fabric sleeve filter; and a pneumatic cylinder having an elongate shaft receiving member attached thereto and having an extendible arm to engage said tension means.

Claim 2

Dependent Claim 192 words

In an inside to outside dust collector having a bag support frame and a cell plate to which is connected one end of a fabric sleeve filter, in combination, a tensioning bag retainer comprising: (a) a circular bag support member which carries, in sealing engagement therewith, the other end of said fabric sleeve filter; (b) an elongate shaft secured to said bag support member and extending upwardly through said bag support frame, said elongate shaft including a plurality of spaced holes bored laterally through said shaft in the portion thereof extending above said bag support frame; (c) compressible tension means received on said elongate shaft which projects above said bag support frame, said tension means including spring means received on said elongate shaft; (d) an adjustable pin removably disposed through one said hole of said shaft above said spring means whereby said spring means is captured between said pin and said bag support frame and said spring means acts against said pin to apply tension to said fabric sleeve filter; and a pneumatic cylinder having an elongate shaft receiving member attached thereto and having an extendible arm to engage said tension means.

Claim 3

Dependent Claim 132 words

A process for tensioning a fabric sleeve filter supported from a bag support frame by a bag retainer assembly comprising a vertical rod connected to the end of said sleeve filter and extended upwardly through said bag support frame and a tensioning spring received on the upper portion of said rod; the steps of said process comprising: gripping the upper end of said bag retainer rod with a pneumatic cylinder having an extendible arm; pneumatically compressing said tensioning spring with the extendible arm of said cylinder simultaneous with said gripping step whereby said fabric sleeve filter is appropriately tensioned; and installing a removable retainer on said vertical rod adjacent said tensioning spring when said sleeve filter is appropriately tensioned to capture said tensioning spring between said retainer and said bag support frame.

Claim 4

Dependent Claim 132 words

A process for tensioning a fabric sleeve filter supported from a bag support frame by a bag retainer assembly comprising a vertical rod connected to the end of said sleeve filter and extended upwardly through said bag support frame and a tensioning spring received on the upper portion of said rod; the steps of said process comprising: gripping the upper end of said bag retainer rod with a pneumatic cylinder having an extendible arm; pneumatically compressing said tensioning spring with the extendible arm of said cylinder simultaneous with said gripping step whereby said fabric sleeve filter is appropriately tensioned; and installing a removable retainer on said vertical rod adjacent said tensioning spring when said sleeve filter is appropriately tensioned to capture said tensioning spring between said retainer and said bag support frame.

Claim 5

Dependent Claim 32 words

The process as in claim 2, said gripping step includes installing a pin member on the upper end of said bag retainer rod and removably engaging said pin member with said cylinder.

Claim 6

Dependent Claim 26 words

The process as in claim 2, said compressing step includes delivering compressed gas at a preselected pressure to said pneumatic cylinder to extend said arm therefrom.

Claim 7

Dependent Claim 35 words

The process as in claim 2, said compressing step includes delivering compressed gas at a controlled rate of flow to said pneumatic cylinder to regulate the speed at which said arm extends from said cylinder.

Claim 8

Dependent Claim 23 words

The process as in claim 5, said compressing step further includes delivery of compressed gas at a preselected pressure to said pneumatic cylinder.

Claim 9

Dependent Claim 148 words

Apparatus for tensioning a fabric sleeve filter supported from a bag support frame by a bag retainer assembly comprising a vertical rod connected to the end of said sleeve filter and a tensioning spring received on the upper portion of said rod, said apparatus comprising: a pneumatic cylinder having a retainer rod receiving member attached thereto and having an extendible arm to engage said tensioning spring; an actuator valve connected to said cylinder operable in one position to admit compressed gas to said cylinder to permit extension of said arm and operable in a second position to vent said cylinder to permit retraction of said arm; and compressed gas means connected to said actuator valve, said compressed gas means including a flow regulating valve to control the rate of compressed gas flow to said cylinder and thereby regulate the speed at which said arm extends from said cylinder.

Claim 10

Dependent Claim 148 words

Apparatus for tensioning a fabric sleeve filter supported from a bag support frame by a bag retainer assembly comprising a vertical rod connected to the end of said sleeve filter and a tensioning spring received on the upper portion of said rod, said apparatus comprising: a pneumatic cylinder having a retainer rod receiving member attached thereto and having an extendible arm to engage said tensioning spring; an actuator valve connected to said cylinder operable in one position to admit compressed gas to said cylinder to permit extension of said arm and operable in a second position to vent said cylinder to permit retraction of said arm; and compressed gas means connected to said actuator valve, said compressed gas means including a flow regulating valve to control the rate of compressed gas flow to said cylinder and thereby regulate the speed at which said arm extends from said cylinder.

Claim 11

Dependent Claim 38 words

The apparatus as in claim 7, said compressed gas means including an adjustable pressure regulating valve to determine the pressure of said compressed gas delivered to said cylinder and thereby regulate the force applied to said tensioning spring.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1986-08-01	1987-01-31	1987-08-02	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1990-08-01	1991-01-31	1991-08-02	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1994-08-01	1995-01-31	1995-08-02	$7700.00	Window Closed / Lapsed

Method and apparatus for tensioning bag filters

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