US3707998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust collector shroud
Assignee: Individual
•
Filing: 1971-06-28
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Granted: 1973-01-02
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Expires: 1991-06-28
Abstract
Abstract A collapsible shroud prevents the escape of cement dust or other dust into the atmosphere when filling a transit mix concrete truck from a batch plant loading station. The shroud is raised to provide clearance for positioning the truck and its filler member relative to the discharge chute of the batch plant. The shroud is made of accordion-pleated material, and is movable about a pivot to encompass and loosely enclose the exposed portion of the truck filler member. A suction tube extends into the interior of the shroud for removing dust generated during gravity discharge of materials from the discharge chute into the filler member. The shroud may contain small apertures for air entry to prevent buildup of dust on the inner walls of the shroud.
Inventors
- 👤 J Dalrymple
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:34
CPC Classifications
B; B65; B65G; B65G69/00; B65G69/18; B65G69/185; B65G69/186
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
106 words
For use between the gravity discharge chute of a materials supply device and the filler chute of a mobile container, the improvement comprising, in combination: a frame adjacent said discharge chute, a dust-confining shroud having a first portion fixed to the frame and a second portion pivotally mounted on the frame, means on said frame for pivoting the second portion of the shroud from an inoperative position to an operative position encompassing and loosely enclosing the exposed portion of the filler chute, and a suction means for removing from the shroud dust generated during gravity discharge of materials from said discharge chute into said filler chute.
Claim 2
Dependent Claim
106 words
For use between the gravity discharge chute of a materials supply device and the filler chute of a mobile container, the improvement comprising, in combination: a frame adjacent said discharge chute, a dust-confining shroud having a first portion fixed to the frame and a second portion pivotally mounted on the frame, means on said frame for pivoting the second portion of the shroud from an inoperative position to an operative position encompassing and loosely enclosing the exposed portion of the filler chute, and a suction means for removing from the shroud dust generated during gravity discharge of materials from said discharge chute into said filler chute.
Claim 3
Dependent Claim
23 words
The combination set forth in claim 1 in which the suction means comprises a suction tube extending into the interior of the shroud.
Claim 4
Dependent Claim
25 words
The combination set forth in claim 1 in which the shroud is formed of pleated material to permit pivotal movement through an arc extending 45*.
Claim 5
Dependent Claim
40 words
The combination set forth in claim 1 in which reversible means are provided on the materials supply device for raising said frame and shroud to provide clearance for positioning the mobile container and filler chute relative to said discharge chute.
Claim 6
Dependent Claim
136 words
For use between the gravity discharge chute of a materials supply device and the filler member of a mobile truck, the truck having a rotary mixing drum with an open end receiving the filleR member, the improvement comprising, in combination: a frame adjacent said discharge chute, a dust-confining shroud movably mounted on the frame, reversible means on the supply device for raising said frame and shroud to provide clearance for positioning the truck and filler member relative to said discharge chute, means on said frame for moving the shroud from an inoperative position to an operative position encompassing and loosely enclosing the exposed portion of the filler member, and a suction tube extending into the interior of the shroud for removing dust generated during gravity discharge of materials from said discharge chute into said filler member.
Claim 7
Dependent Claim
136 words
For use between the gravity discharge chute of a materials supply device and the filler member of a mobile truck, the truck having a rotary mixing drum with an open end receiving the filleR member, the improvement comprising, in combination: a frame adjacent said discharge chute, a dust-confining shroud movably mounted on the frame, reversible means on the supply device for raising said frame and shroud to provide clearance for positioning the truck and filler member relative to said discharge chute, means on said frame for moving the shroud from an inoperative position to an operative position encompassing and loosely enclosing the exposed portion of the filler member, and a suction tube extending into the interior of the shroud for removing dust generated during gravity discharge of materials from said discharge chute into said filler member.
Claim 8
Dependent Claim
178 words
For use between the gravity discharge chute of a materials supply device and the filler member of a mobile truck, the truck having a rotary mixing drum with an open end receiving the filler member, the improvement comprising, in combination: a frame adjacent said discharge chute, an accordion-pleated dust-confining shroud having a first portion fixed to the frame and a second portion pivotally mounted on the frame, reversible means on the materials supply device for raising said frame and shroud to provide clearance for positioning the truck and filler member relative to said discharge chute, means on said frame for pivoting the second portion of the shroud from a substantially horizontal inoperative position to an operative position encompassing and loosely enclosing the exposed portion of the filler member, the shroud in operative position providing clearance spaces between the shroud and the truck for entry of ambient air into the shroud, and a suction tube extending into the interior of the shroud for removing dust generated during gravity discharge of materials from said discharge chute into said filler member.
Claim 9
Dependent Claim
178 words
For use between the gravity discharge chute of a materials supply device and the filler member of a mobile truck, the truck having a rotary mixing drum with an open end receiving the filler member, the improvement comprising, in combination: a frame adjacent said discharge chute, an accordion-pleated dust-confining shroud having a first portion fixed to the frame and a second portion pivotally mounted on the frame, reversible means on the materials supply device for raising said frame and shroud to provide clearance for positioning the truck and filler member relative to said discharge chute, means on said frame for pivoting the second portion of the shroud from a substantially horizontal inoperative position to an operative position encompassing and loosely enclosing the exposed portion of the filler member, the shroud in operative position providing clearance spaces between the shroud and the truck for entry of ambient air into the shroud, and a suction tube extending into the interior of the shroud for removing dust generated during gravity discharge of materials from said discharge chute into said filler member.
Claim 10
Dependent Claim
20 words
The combination set forth in claim 6 in which portions of the pleated shroud are provided with air inlet apertures.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |