US4614439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixer for mixing fibres into a slurry
Assignee: Pilkington Group Ltd
•
Filing: 1985-07-03
•
Granted: 1986-09-30
•
Expires: 2005-07-03
Abstract
Abstract A mixer for mixing glass fibres into a thick aqueous cement slurry comprises means for feeding glass fibres on to the surface of a batch of the slurry in an upright cylindrical chamber, an agitator mounted on a coaxial vertical shaft and carrying at its lower end both a plurality of short impeller blades and a long horizontal member with tip blades of opposite sense to the impeller blades, so as to cause vertical as well as horizontal circulation of the slurry, and stationary baffles on the wall of the chamber angled to cause production of standing waves on the surface of the slurry.
Inventors
- 👤 William H. Brunt
- 👤 Christopher J. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:51
CPC Classifications
B; B01; B01F; B01F27/00; B01F27/80; B01F27/86; B28; B28C; B28C5/00; B28C5/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
189 words
A mixer for mixing fibres into a slurry, comprising an upright cylindrical chamber, means for supplying a batch of slurry into the chamber and means for feeding glass fibres on to the surface of the batch of slurry in the chamber, wherein an agitator is provided in the chamber in the form of a rotatable vertical shaft coincident with the axis of the chamber and carrying adjacent the lower end of the chamber both a plurality of impeller blades whose radial extent is substantially less than the radius of the chamber and at least one horizontal member with tip blades adjacent the cylindrical wall of the chamber, the impeller blades and the tip blades being angled in opposite senses to produce a vertical circulation as well as a rotational movement of the slurry in the chamber, and stationary baffles are secured to the wall of the chamber and angled so that, in conjunction with the vertical and rotational movements of the slurry, they cause the production of standing waves on the surface of the slurry to assist in folding into the slurry glass fibres falling on to its surface.
Claim 2
Dependent Claim
189 words
A mixer for mixing fibres into a slurry, comprising an upright cylindrical chamber, means for supplying a batch of slurry into the chamber and means for feeding glass fibres on to the surface of the batch of slurry in the chamber, wherein an agitator is provided in the chamber in the form of a rotatable vertical shaft coincident with the axis of the chamber and carrying adjacent the lower end of the chamber both a plurality of impeller blades whose radial extent is substantially less than the radius of the chamber and at least one horizontal member with tip blades adjacent the cylindrical wall of the chamber, the impeller blades and the tip blades being angled in opposite senses to produce a vertical circulation as well as a rotational movement of the slurry in the chamber, and stationary baffles are secured to the wall of the chamber and angled so that, in conjunction with the vertical and rotational movements of the slurry, they cause the production of standing waves on the surface of the slurry to assist in folding into the slurry glass fibres falling on to its surface.
Claim 3
Dependent Claim
29 words
A mixer according to claim 1 wherein the chamber has a conical bottom outlet for removing the batch of slurry after the glass fibres have been mixed into it.
Claim 4
Dependent Claim
43 words
A mixer according to claim 1 wherein the impeller blades are angled to cause downward movement of the slurry adjacent the axis of the chamber while the tip blades are angled to cause upward movement of the slurry adjacent to the chamber wall.
Claim 5
Dependent Claim
36 words
A mixer according to claim 1 wherein each stationary baffle has a curved front wall extending obliquely from the chamber wall to deflect the rotational movement of the slurry smoothly towards the middle of the chamber.
Claim 6
Dependent Claim
25 words
A mixer according to claim 4 wherein each stationary baffle has a curved rear wall which fairs the baffle smoothly back into the chamber wall.
Claim 7
Dependent Claim
36 words
A mixer according to claim 1 wherein the means for feeding glass fibres on to the surface of the slurry comprises a vibratory feeder disposed with its outlet above the chamber but offset from its axis.
References Cited (Backward Citations)
US2258A
Cited
FR515640A
Cited
US2235604A
Cited
US2964301A
Cited
US3404870A
Cited
US3488038A
Cited
US3995839A
Cited
US4254699A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-29 | 1990-03-31 | 1990-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-29 | 1994-03-31 | 1994-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-29 | 1998-03-31 | 1998-09-30 | $7700.00 | Window Closed / Lapsed |