Patent US3797760A successfully refreshed from Google Patents.
US3797760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjusting crusher under load
Assignee: Rexnord Inc
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Filing: 1972-04-05
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Granted: 1974-03-19
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Expires: 1992-04-05
Abstract
Abstract This is a cone crusher and method of adjusting it under load by partially unclamping the bowl to an extent such that the bowl may be rotated but with some clamping pressure maintained so that the threads stay in full contact thereby avoiding any damage to the threads from the crushing blows.
Inventors
- 👤 D Davis
- 👤 U Sawant
- 👤 F Scaffidi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:52
CPC Classifications
B; B02; B02C; B02C2/00; B02C2/02; B02C2/04; B02C2/045
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
157 words
A method of adjusting the size of the crushing cavity in a cone crusher while the crusher is in operation, the crusher having a generally circumferential main frame with a bowl mounted for adjustment in the main frame opposite a crushing head mounted for gyration within the main frame and bowl clamping means for applying a clamping thrust to the bowl to clamp it in the main frame; including the steps of applying a full clamping thrust to the bowl during normal crushing operation, partially relieving the clamping thrust when the bowl is to be adjusted to an extent such that the bowl may be adjusted but sufficient clamping thrust will be mainained so that the bowl will be in firm contact with the frame, moving the bowl through the desired amount of adjustment while maintaining such partial clamping thrust during bowl movement and, at the conclusion of such bowl adjustment, reapplying the full bowl clamping thrust.
Claim 2
Independent Claim
157 words
A method of adjusting the size of the crushing cavity in a cone crusher while the crusher is in operation, the crusher having a generally circumferential main frame with a bowl mounted for adjustment in the main frame opposite a crushing head mounted for gyration within the main frame and bowl clamping means for applying a clamping thrust to the bowl to clamp it in the main frame; including the steps of applying a full clamping thrust to the bowl during normal crushing operation, partially relieving the clamping thrust when the bowl is to be adjusted to an extent such that the bowl may be adjusted but sufficient clamping thrust will be mainained so that the bowl will be in firm contact with the frame, moving the bowl through the desired amount of adjustment while maintaining such partial clamping thrust during bowl movement and, at the conclusion of such bowl adjustment, reapplying the full bowl clamping thrust.
Claim 3
Dependent Claim
41 words
The method of claim 1 further characterized in that the bowl is screw-threaded for adjustment in the main frame and the bowl clamping means applies a clamping upthrust to the bowl and in that the bowl is adjusted by rotating it.
Claim 4
Dependent Claim
41 words
The method of claim 2 in which the crusher is provided with power means for rotating the bowl, and further including the step of automatically re-applying the full bowl clamping upthrust at the end of each operation of the power means.
Claim 5
Dependent Claim
52 words
The method of claim 2 in which the crusher is provided with a hydraulic ram for rotating the bowl in the main frame, and further including the step of automatically reapplying the full bowl clamping uPthrust at the end of bowl rotation responsive to the ram reaching the end of its stroke.
Claim 6
Independent Claim
146 words
An apparatus for adjusting the size of the crushing cavity in a cone crusher while the crusher is in operation in which the crusher has a generally circumferential main frame with a bowl mounted for adjustment in the main frame opposite a crushing head mounted for gyration within the main frame and a bowl clamping means for applying a clamping thrust to the bowl to clamp it in the main frame, including means for applying a full clamping thrust to the bowl during normal operation of the crusher, means for partially relieving the clamping thrust when the bowl is to be adjusted to an extent such that the bowl may be moved but sufficient clamping thrust will be maintained so that the bowl will be in firm contact with the frame, and means for reapplying the full bowl clamping thrust at the conclusion of bowl adjustment.
Claim 7
Independent Claim
146 words
An apparatus for adjusting the size of the crushing cavity in a cone crusher while the crusher is in operation in which the crusher has a generally circumferential main frame with a bowl mounted for adjustment in the main frame opposite a crushing head mounted for gyration within the main frame and a bowl clamping means for applying a clamping thrust to the bowl to clamp it in the main frame, including means for applying a full clamping thrust to the bowl during normal operation of the crusher, means for partially relieving the clamping thrust when the bowl is to be adjusted to an extent such that the bowl may be moved but sufficient clamping thrust will be maintained so that the bowl will be in firm contact with the frame, and means for reapplying the full bowl clamping thrust at the conclusion of bowl adjustment.
Claim 8
Dependent Claim
44 words
The structure of claim 5 further characterized in that the bowl is screw-threaded in the frame and the bowl clamping means applies an upthrust to the bowl to clamp it in the threads in the main frame, the bowl being rotated to adjust it.
Claim 9
Dependent Claim
38 words
The structure of claim 6 further characterized by and including power means on the crusher for rotating the bowl, and means for automatically applying full bowl clamping upthrust at the conclusion of each excursion of the power means.
Claim 10
Dependent Claim
53 words
The structure of claim 6 further characterized by and including rams on the crusher for rotating the bowl, at least one ram for rotating the bowl in each direction, a hydaulic circuit for operating the rams and bowl clamping means, and means for isolating one ram while the other is rotating the bowl.
Claim 11
Dependent Claim
56 words
The structure of claim 6 further characterized in that the crusher is provided with a hydaulic ram for rotating the bowl, a hydraulic circuit for operating the ram and bowl clamping means, means for fully unclamping the bowl clamping means, and means responsive to the full unclamping means for isolating the ram from the hydraulic circuit.
Claim 12
Dependent Claim
85 words
In a cone crusher, a generally circumferential main frame, a bowl mounted for adjustment in the main frame and disposed opposite a crushing head mounted for gyration within the main frame, and a bowl clamping system for clamping the bowl in the main frame, including means for applying a full clamping thrust to the bowl during normal operation of the crusher, and means for partially relieving said clamping thrust so that the bowl may be adjusted during operation while still firmly supported on the frame.
Claim 13
Dependent Claim
85 words
In a cone crusher, a generally circumferential main frame, a bowl mounted for adjustment in the main frame and disposed opposite a crushing head mounted for gyration within the main frame, and a bowl clamping system for clamping the bowl in the main frame, including means for applying a full clamping thrust to the bowl during normal operation of the crusher, and means for partially relieving said clamping thrust so that the bowl may be adjusted during operation while still firmly supported on the frame.
Claim 14
Dependent Claim
55 words
The structure of claim 10 further characterized in that the bowl is screw-threaded for adjustment in the main frame and the clamping system includes means for applying a releasable upthrust to the bowl to clamp it in its various positions of adjustment so that thread clearance will be removed between the bowl and main frame.
Claim 15
Dependent Claim
77 words
The structure of claim 11 further characterized by and including a hydraulic ram on the frame for rotating the bowl, a hydraulic circuit connected to the ram and to the bowl clamping means and constructed so that, when the bowl clamping means is applying a partial clamping pressure, the ram will be operated to rotate the bowl and, when the ram reaches the end of its extension, the bowl clamping means will automatically apply full clamping pressure.
Claim 16
Dependent Claim
37 words
The structure of claim 12 further characterized by and including means for releasing the full clamping pressure of the bowl clamping means, and means for isolating the hydraulic ram when the bowl clamping means is fully unclamped.
Claim 17
Dependent Claim
57 words
The structure of claim 12 further characterized by and including at least two hydraulic rams, one disposed to rotate the bowl in one direction and the other disposed to rotate the bowl in the other direction, means for selectively energizing either one ram or the other, and means for isolating one ram when the other is operated.
Claim 18
Dependent Claim
93 words
The structure of claim 5 further characterized by and including a ram for rotating the bowl, means for applying hydraulic pressure simultaneously to the ram and bowl clamping means so that the ram will rotate the bowl automatically when the clamping pressure is relieved a sufficient amount to allow the bowl to rotate, and means for automatically relieving the hydraulic pressure to the clamping means responsive to the buildup in pressure when the ram reaches the end of its stroke so that a full clamping thrust will be automatically reapplied to the bowl.
Claim 19
Dependent Claim
61 words
The structure of claim 5 further characterized in that the bowl clamping means includes a plurality of springs disposed about the crusher to apply a clamping thrust to the bowl, and the means for relieving the clamping thrust includes a hydraulic circuit with at least one hydraulic cylinder for compressing the springs to release the bowl so it may be adjusted.
Claim 20
Dependent Claim
40 words
The structure of claim 5 further characterized by and including a spring release for allowing the bowl to release for tramp iron clearance, and a hydraulic jack circuit for compressing and overcoming the spring release separate from the bowl-clamping means.
Claim 21
Dependent Claim
29 words
The structure of claim 8 further characterized by and including means for fully unclamping the bowl-clamping means, and means responsive to the full unclamping means for isolating both rams.
Claim 22
Dependent Claim
102 words
The structure of claim 5 further characterized in that the crusher is provided with a spring release for allowing the bowl to release for tramp iron clearance, a series of hydraulic jacks about the crusher with a hydraulic circuit connected thereto constructed and arranged so that upon a first excursion of the jacks, the bowl will be partially released for adjustment, upon a second excursion of the jacks the bowl will be fully released for rapid adjustment of the bowl, and upon a third excursion of the jacks the spring release will be overcome and the bowl raised for tramp iron clearance.
Claim 23
Dependent Claim
67 words
The structure of claim 19 further characterized in that the hydraulic circuit includes two components, the first component being arranged to operate the jacks through their first and second excursions, and the second component being arranged to operate the jacks through their third excursion with a tie between the two components so that when the second component is operating the jacks, the first component will be isolated.
Claim 24
Independent Claim
77 words
A method of adjusting a crusher while it is in operation including the steps of applying a full clamping thrust to the bowl during normal crushing operation, partially but not fully relieving the clamping thrust when the bowl is to be adjusted with sufficient clamping thrust remaining so that the bowl is fully and firmly supported in the crusher, and moving material through the crusher while operating the machine with the bowl under the partial clamping thrust.
Claim 25
Independent Claim
77 words
A method of adjusting a crusher while it is in operation including the steps of applying a full clamping thrust to the bowl during normal crushing operation, partially but not fully relieving the clamping thrust when the bowl is to be adjusted with sufficient clamping thrust remaining so that the bowl is fully and firmly supported in the crusher, and moving material through the crusher while operating the machine with the bowl under the partial clamping thrust.
References Cited (Backward Citations)
US3009660A
Cited
US3133708A
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US3142449A
Cited
US3396915A
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US3397846A
Cited
US3542301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |