US3881582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Punch press clutch and brake with pressure booster
Assignee: CONWAY CLUTCH CO
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Filing: 1973-08-13
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Granted: 1975-05-06
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Expires: 1993-08-13
Abstract
Abstract A punch press has a fail-safe brake operable to continuously brake the punch until the press is deliberately actuated. A hydraulically deactivated spring applied brake assembly is utilized to brake a disk attached to a cam shaft which drives the punch. The spring members of the assembly normally engaged the brake, pneumatically controlled hydraulic pressure (via a pneumatic-hydraulic booster) being utilized to release and disengage the brake. A pneumatically actuated clutch selectively connects the cam shaft to a driving means to actuate the punch. The pneumatic clutch and brake controls are connected to a common source of pneumatic pressure so that the brake can be disengaged only when the clutch is deliberately actuated. The brake remains engaged despite pneumatic or hydraulic system failures.
Inventors
- 👤 William A Conway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:01
CPC Classifications
B; B26; B26D; B26D7/00; B26D7/22; B21; B21D; B21D55/00; B30; B30B; B30B15/00; B30B15/14
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
263 words
In a punch press of the type including a driving motor, a flywheel connected to be driven by said motor, a punch, a cam shaft for driving the punch, and pneumatically actuated clutch means for selectively engaging said flywheel with said cam shaft in order to rotate the shaft and drive said punch when pressure air is supplied to said clutch, motion control apparatus comprising: a braking disk positively secured to said cam shaft and including a braking surface on one side of said disk, a source of pressurized air, a pneumatic-hydraulic booster connected to said source of pressurized air and having an hydraulic output, hydraulically deactivated spring applied brakes hydraulically connected to said booster and disposed to normally engage the side braking surface of said braking disk on opposite sides of the cam shaft to stop said braking disk, said spring applied brakes having braking pads mounted to move toward and away from the braking surface in a direction parallel to the cam shaft on which the braking disk is mounted, said hydraulically deactivated spring applied brakes normally braking said disk but being operable to disengage from said disk, in a direction parallel to the cam shaft, when pressure air is applied to said booster to hydraulically deactivate said brakes, and means for selectively and commonly connecting said source of pressurized air to said pneumatically actuated clutch means and to said booster to engage said clutch and disengage said brake and for selectively and commonly venting said clutch means and booster to that said brake is engaged whenever said clutch is disengaged.
Claim 2
Dependent Claim
263 words
In a punch press of the type including a driving motor, a flywheel connected to be driven by said motor, a punch, a cam shaft for driving the punch, and pneumatically actuated clutch means for selectively engaging said flywheel with said cam shaft in order to rotate the shaft and drive said punch when pressure air is supplied to said clutch, motion control apparatus comprising: a braking disk positively secured to said cam shaft and including a braking surface on one side of said disk, a source of pressurized air, a pneumatic-hydraulic booster connected to said source of pressurized air and having an hydraulic output, hydraulically deactivated spring applied brakes hydraulically connected to said booster and disposed to normally engage the side braking surface of said braking disk on opposite sides of the cam shaft to stop said braking disk, said spring applied brakes having braking pads mounted to move toward and away from the braking surface in a direction parallel to the cam shaft on which the braking disk is mounted, said hydraulically deactivated spring applied brakes normally braking said disk but being operable to disengage from said disk, in a direction parallel to the cam shaft, when pressure air is applied to said booster to hydraulically deactivate said brakes, and means for selectively and commonly connecting said source of pressurized air to said pneumatically actuated clutch means and to said booster to engage said clutch and disengage said brake and for selectively and commonly venting said clutch means and booster to that said brake is engaged whenever said clutch is disengaged.
Claim 3
Dependent Claim
59 words
Apparatus as in claim 1 further including a solenoid controlled valve for alternately connecting pressure air to and venting said clutch means and said pneumatic-hydraulic booster, and means for controlling said solenoid including two normally open switches which must be simultaneously closed to actuate said solenoid to move said valve to simultaneously engage the clutch and disengage the brake.
Claim 4
Dependent Claim
133 words
Apparatus as in claim 1 wherein each of said hydraulically deactivated spring applied brakes includes, a brake body providing both a spring chamber having spring means therein and an hydraulic chamber, means hydraulically connecting the hydraulic output of said pneumatic-hydraulic booster to said hydraulic chamber, an hydraulic piston in said hydraulic chamber, said piston being spring biased by said spring means into said hydraulic chamber, a brake pad actuating shaft connected at one end to said hydraulic piston and extending through and outwardly of said hydraulic chamber, a brake pad mounting member connected to another end of said pad actuating shaft, a magnet mounted in said pad mounting member, a pad backing pad magnetically held on said pad mounting member by said magnet, and a brake pad connected to said pad backing plate.
Claim 5
Dependent Claim
118 words
Apparatus as in claim 3 wherein said brake body has a forward end member through which said pad actuating shaft extends, and further including, at least two holes in said forward end member, radially spaced from said actuating shaft and parallel thereto, at least two corresponding holes in said pad mounting member, said corresponding holes aligned with the holes in the forward end member, and at least two longitudinal pins mounted in said pad backing plate, said pins respectively extending rearwardly through said aligned respective holes in said pad mounting member and in said forward end member in order to positively locate and to hold said pad, said pad backing plate, and said pad mounting member against rotation.
Claim 6
Dependent Claim
28 words
Apparatus as in claim 3 further including an hydraulic pressure guage operably connected to the hydraulic chamber in each brake to monitor hydraulic pressure in the hydraulic chamber.
Claim 7
Dependent Claim
58 words
Apparatus as in claim 1 wherein said hydraulically deactivated spring applied brakes includes, a brake pad mounted on a backing member, a brake pad mounting member connected to a brake pad actuating shaft, and a magnet mounted on the mounting member, said magnet releaseably and magnetically holding said pad and said backing member on said pad mounting member.
Claim 8
Dependent Claim
40 words
Apparatus as in claim 6 wherein said hydraulically deactivated spring applied brake has a forward end member and further including pins connected to said backing member and extending rearwardly through said pad mounting member and into said forward end member.
Claim 9
Dependent Claim
178 words
Apparatus as in claim 1 wherein said pneumatic hydraulic booster comprises a pneumatic chamber having a predetermined diameter, a pneumatic piston in said chamber, said piston having a predetermined working surface area, a pneumatic port in a rearward portion of a chamber connected to said source of pressurized air, a vent port in a forward port of the chamber, a hydraulic chamber extending forwardly of said pneumatic chamber and having a diameter less than that of said pneumatic chamber, an hydraulic piston connected to said pneumatic piston and extending therefrom forwardly into said hydraulic chamber, said hydraulic piston having a predetermined working surface area less than the working surface area of said pneumatic piston, an hydraulic fluid reservoir connected to a rearward portion of said hydraulic chamber to supply fluid thereto when said hydraulic piston is retracted, hydraulic ports in a forward portion of said hydraulic chamber, said hydraulic ports being connected to said brakes to apply a predetermined hydraulic deactivating pressure thereto when a lesser pneumatic pressure is applieD to said pneumatic piston through said pneumatic port.
Claim 10
Dependent Claim
33 words
Apparatus as in claim 8 wherein said hydraulic pressure is in the approximate range of 1,500 to 2,000 pounds per square inch, and said pneumatic pressure is approximately 100 pounds per square inch.
Claim 11
Dependent Claim
250 words
In a punch press, fail-safe apparatus for driving and for braking a punch including, a cam shaft for driving said punch, driving means for rotating said cam shaft, a source of pressurized air, pneumatic clutch means for connecting said driving means to said cam shaft when pressure air is supplied to said clutch, a braking disk positively mounted on said cam shaft independent of said pneumatic clutch means, at least one side of said disk providing a braking surface, a pneumatic-hydraulic booster connected to said source of pressurizied air, a pair of hydraulically deactivated spring applied brakes hydraulically connected to said booster and disposed to normally engage the side braking surface of said braking disk on opposite sides of the cam shaft to stop said braking disk, said spring applied brakes having braking pads mounted to move toward and away from the braking surface in a direction parallel to the cam shaft on which the braking disk in mounted, said hydraulically deactivated spring applied brakes normally braking said disk but being operable to disengage from said disk, in a direction parallel to the cam shaft, when pressure air is applied to said booster to hydraulically deactivate said brakes, and means for selectively and commonly connecting said source of pressurized air to said pneumatic clutch means and to said booster to engage said clutch and disengage said brake and for selectively and commonly venting said clutch means and said booster so that said brake is engaged whenever said clutch is disengaged.
Claim 12
Dependent Claim
250 words
In a punch press, fail-safe apparatus for driving and for braking a punch including, a cam shaft for driving said punch, driving means for rotating said cam shaft, a source of pressurized air, pneumatic clutch means for connecting said driving means to said cam shaft when pressure air is supplied to said clutch, a braking disk positively mounted on said cam shaft independent of said pneumatic clutch means, at least one side of said disk providing a braking surface, a pneumatic-hydraulic booster connected to said source of pressurizied air, a pair of hydraulically deactivated spring applied brakes hydraulically connected to said booster and disposed to normally engage the side braking surface of said braking disk on opposite sides of the cam shaft to stop said braking disk, said spring applied brakes having braking pads mounted to move toward and away from the braking surface in a direction parallel to the cam shaft on which the braking disk in mounted, said hydraulically deactivated spring applied brakes normally braking said disk but being operable to disengage from said disk, in a direction parallel to the cam shaft, when pressure air is applied to said booster to hydraulically deactivate said brakes, and means for selectively and commonly connecting said source of pressurized air to said pneumatic clutch means and to said booster to engage said clutch and disengage said brake and for selectively and commonly venting said clutch means and said booster so that said brake is engaged whenever said clutch is disengaged.
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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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |