Patent US3557975A successfully refreshed from Google Patents.
US3557975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pusher assembly for freezers
Assignee: ST Regis Paper Co
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Filing: 1969-03-13
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Granted: 1971-01-26
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Expires: 1989-03-13
Abstract
Abstract In a freezer having contact freezer plates which are vertically movable into register with a front charging opening, a pusher assembly for intermittently feeding a single row of boxes from a conveyor through said opening and for alternatively removing all the boxes from each plate through a discharge opening, for example, when the freezer is to be defrosted said assembly including a pusher bar movable generally in the plane of said charging opening, a plurality of drive rods for advancing the pusher bar, trackways extending forwardly from the front of the freezer supporting said rods for sliding movement and a pusher frame secured at the forward ends of said drive rods.
Inventors
- 👤 Pasquale Amerio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:10
CPC Classifications
F; F25; F25D; F25D25/00; F25D25/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
170 words
A pusher assembly for intermittently feeding a single row of boxes from a conveyor through a front charging opening in a freezer having contact freezer plates which are vertically movable into register with said opening, and for alternatively removing all the boxes from each plate through a discharge opening, said pusher assembly including a pusher bar movable generally in the plane of said charging opening, a plurality of drive rods for advancing the pusher bar, trackways extending forwardly from the front of the freezer supporting said rods for sliding movement, a frame secured at the forward ends of said drive rods, a pivotal connection between the pusher bar and the frame to permit the bar to raise over the oncoming boxes on the conveyor after a first row has been pushed into the freezer, a motor for advancing and retracting the drive rods to successively feed said rows into the freezer, and means for moving the pusher assembly clear across the plate to remove all boxes therefrom in one stroke.
Claim 2
Dependent Claim
170 words
A pusher assembly for intermittently feeding a single row of boxes from a conveyor through a front charging opening in a freezer having contact freezer plates which are vertically movable into register with said opening, and for alternatively removing all the boxes from each plate through a discharge opening, said pusher assembly including a pusher bar movable generally in the plane of said charging opening, a plurality of drive rods for advancing the pusher bar, trackways extending forwardly from the front of the freezer supporting said rods for sliding movement, a frame secured at the forward ends of said drive rods, a pivotal connection between the pusher bar and the frame to permit the bar to raise over the oncoming boxes on the conveyor after a first row has been pushed into the freezer, a motor for advancing and retracting the drive rods to successively feed said rows into the freezer, and means for moving the pusher assembly clear across the plate to remove all boxes therefrom in one stroke.
Claim 3
Dependent Claim
22 words
The apparatus of claim 1 wherein racks are secured to the drive rods and gears driven by the motor engage the racks.
Claim 4
Dependent Claim
39 words
The apparatus of claim 1 wherein said drive rods are formed in articulated sections and each trackway has a section extending forwardly from the freezer, an upwardly extending section at the free end thereof and a curved section therebetween.
Claim 5
Dependent Claim
35 words
The apparatus of claim 1 wherein the pusher assembly is vertically adjustable to permit it to be lowered when the pusher bar and supporting means therefor is in position to move clear across the plate.
Claim 6
Dependent Claim
13 words
The apparatus of claim 1 wherein the motor is a reversible hydraulic motor.
Claim 7
Dependent Claim
22 words
The apparatus of claim 1 wherein the pusher assembly is automatically controlled during feeding of single rows of boxes to the freezer.
Claim 8
Dependent Claim
25 words
The apparatus of claim 1 wherein the row of boxes cams the pivoted pusher bar upwardly to ride over the boxes on the return stroke.
Claim 9
Dependent Claim
17 words
The apparatus of claim 1 wherein power driven means are provided to raise the pivoted pusher bar.
Claim 10
Dependent Claim
20 words
The apparatus of claim 1 wherein the tracks over which the drive rods move have plastic liners to reduce friction.
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |