Patent US4238276A successfully refreshed from Google Patents.
Patent US3854362A successfully refreshed from Google Patents.
US3854362A
Expired / Lapsed
US
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Hydraulic control system for hollow punching machines
Assignee: ATOM CANTELLA DEAMBROSIS
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Filing: 1972-08-22
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Granted: 1974-12-17
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Expires: 1992-08-22
Abstract
Abstract A hydraulic control system for a punching machine having an overhanging head held in a raised position relative to a workpiece table by a hollow column which is movable downwardly lowering the head and upwardly raising the head. The column functions as a piston in an upright and defines therewith with two seals a two-chamber hydraulic cylinder to which hydraulic fluid under pressure is applied from a hydraulic circuit for executing the vertical reciprocable travel of the column or piston. The hydraulic circuit is provided with a control valve having a spool having a plurality of circumferential collars or lands coactive with internal annular lands in the valve body for effecting control of the hydraulic fluid for maintaining the piston-like column and therefore the head, in a raised position and lowering it and returning it to a raised position.
Inventors
- 👤 E Cantella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:34
CPC Classifications
B; B26; B26D; B26D5/00; B26D5/08; B26D5/12; B30; B30B; B30B15/00; B30B15/16; Y; Y10; Y10T; Y10T83/00; Y10T83/869; Y10T83/8696; Y10T83/87; Y10T83/8702; Y10T83/8704; Y10T83/8821; Y10T83/8827; Y10T83/8858
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
292 words
In a punching machine having an overhanging head, a movable column vertically movable for lowering said head from a raised position and raising said head to said raised position, a hydraulic cylinder for reciprocable driving of said column means defining a hydraulic circuit for providing fluid under pressure to said cylinder for lowering and raising said head, an electrical control circuit, the improvement which comprises a valve in said hydraulic circuit for controlling application of hydraulic fluid to said cylinder maintaining said head in a raised position and for selectively lowering and raising said column thereby lowering and raising said head, said valve comprising a valve body and a valve spool reciprocable therein controlling flow of fluid under pressure into said cylinder for lowering and raising said head, said valve spool having an axial extension actuated under control of said control circuit for effecting travel of said spool for control of application of hydraulic fluid under pressure to said cylinder for lowering the column, means connected to said head and to said valve spool displacing said spool in a direction, as said column is raised, for controlling flow of hydraulic fluid under pressure to said cylinder for regulating the speed of raising said column and maintaining it in said raised position, adjust means coactive with said means connected to said head and to said valve spool for variably adjusting the position of said spool relative to said valve body thereby variably setting the raised position of said column and said head, and said valve body and said spool each having a plurality of coacting, axially spaced annular lands defining flow paths controlling application of said hydraulic fluid to said cylinder for lowering and raising said column thereby lowering and raising said head.
Claim 2
Dependent Claim
292 words
In a punching machine having an overhanging head, a movable column vertically movable for lowering said head from a raised position and raising said head to said raised position, a hydraulic cylinder for reciprocable driving of said column means defining a hydraulic circuit for providing fluid under pressure to said cylinder for lowering and raising said head, an electrical control circuit, the improvement which comprises a valve in said hydraulic circuit for controlling application of hydraulic fluid to said cylinder maintaining said head in a raised position and for selectively lowering and raising said column thereby lowering and raising said head, said valve comprising a valve body and a valve spool reciprocable therein controlling flow of fluid under pressure into said cylinder for lowering and raising said head, said valve spool having an axial extension actuated under control of said control circuit for effecting travel of said spool for control of application of hydraulic fluid under pressure to said cylinder for lowering the column, means connected to said head and to said valve spool displacing said spool in a direction, as said column is raised, for controlling flow of hydraulic fluid under pressure to said cylinder for regulating the speed of raising said column and maintaining it in said raised position, adjust means coactive with said means connected to said head and to said valve spool for variably adjusting the position of said spool relative to said valve body thereby variably setting the raised position of said column and said head, and said valve body and said spool each having a plurality of coacting, axially spaced annular lands defining flow paths controlling application of said hydraulic fluid to said cylinder for lowering and raising said column thereby lowering and raising said head.
Claim 3
Dependent Claim
85 words
In a punching machine according to claim 1, in which said lands on said valve body are disposed internally thereof and said lands on said spool are disposed circumferentially thereof, said lands being disposed relatively axially to and in operation are in and out of registry in dependence upon the axial movement and axial position of said spool and said lands defining a flow path for hydraulic fluid under pressure to maintain said column in a raised position maintaining said head in said raised position.
Claim 4
Dependent Claim
23 words
In a punching machine according to claim 1, in which said means connected to said spool and to said head comprises a cable.
Claim 5
Dependent Claim
25 words
In a punching machine according to claim 3, in which said adjust means comprises a pulley on said head for variably coiling said cable thereon.
Claim 6
Dependent Claim
51 words
In a punching machine according to claim 1, in which said piston comprises a hollow column, supporting said head, said cylinder comprising interior surfaces of said hollow column, a seal within said column, a seal on an end of said column, and including an upright in which said column is reciprocable.
Claim 7
Dependent Claim
40 words
In a punching machine according to claim 1, including damping means having a controlled orifice controlling flow of hydraulic fluid therethrough damping the axial movement of said column as it approaches a rest position in corresponding to said raised position.
Claim 8
Dependent Claim
23 words
In a punching machine according to claim 6, in which said damping means comprises means defining two chambers communicating through said controlled orifice.
Claim 9
Dependent Claim
25 words
In a punching machine according to claim 1, in which said control circuit comprises electromagnetic means coacting with said spool extension for actuating said spool.
Claim 10
Dependent Claim
33 words
In a punching machine according to claim 8, in which said control circuit comprises delay devices for variably delaying the return of said column from a lowered position to the raised position thereof.
Claim 11
Dependent Claim
225 words
In a punching machine having a movable column, a hydraulic cylinder for moving said column to a raised position, lowering said column and restoring it to said raised position, a hydraulic circuit having hydraulic fluid under pressure for supply to said cylinder for moving said column, a control valve in said hydraulic circuit comprising a stationary valve body, a spool movable axially in said valve body and having a plurality of circumferential, annular lands axially spaced thereon, said valve body having a plurality of annular lands axially spaced for coacting with the lands on said spool, said valve body lands comprising one land more than the lands on said spool, means on said valve body defining passages connected to said hydraulic fluid circuit for supply of hydraulic fLuid to said hydraulic cylinder for raising and lowering said column therethrough, means comprising an electromagnet and a return spring for activating said spool axially to positions in which the lands on said spool and body are disposed relatively to define flow paths for fluid from and to said passages to lower and raise said column, a workpiece support member, and an overhanging head movable relative to said table by said column, and means to variably position said spool in said valve body to define variably a raised rest position of said overhanging head relative to said table.
Claim 12
Dependent Claim
225 words
In a punching machine having a movable column, a hydraulic cylinder for moving said column to a raised position, lowering said column and restoring it to said raised position, a hydraulic circuit having hydraulic fluid under pressure for supply to said cylinder for moving said column, a control valve in said hydraulic circuit comprising a stationary valve body, a spool movable axially in said valve body and having a plurality of circumferential, annular lands axially spaced thereon, said valve body having a plurality of annular lands axially spaced for coacting with the lands on said spool, said valve body lands comprising one land more than the lands on said spool, means on said valve body defining passages connected to said hydraulic fluid circuit for supply of hydraulic fLuid to said hydraulic cylinder for raising and lowering said column therethrough, means comprising an electromagnet and a return spring for activating said spool axially to positions in which the lands on said spool and body are disposed relatively to define flow paths for fluid from and to said passages to lower and raise said column, a workpiece support member, and an overhanging head movable relative to said table by said column, and means to variably position said spool in said valve body to define variably a raised rest position of said overhanging head relative to said table.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |