Patent US3677041A successfully refreshed from Google Patents.
US3677041A
Expired / Lapsed
US
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Apparatus for working flat, flexible material
Assignee: MAS FAB TURNER AG
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Filing: 1970-08-19
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Granted: 1972-07-18
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Expires: 1990-08-19
Abstract
Abstract This invention relates to apparatus for working flat, flexible material by means of working members opposing each other. One of the working members is driven back and forth toward and away from the other working member. A piston to which the other working member is connected, is subject to a pressure from a pump and subject to a reset force whereby the piston may be adjusted to predetermined starting elevational positions to provide a desired working pressure. A pressure relief valve assures that the piston yields when the working pressure exceeds said desired pressure and returns to said starting position when the working pressure is reduced again. In a further embodiment an auxiliary pressure space of selectively variable volume is provided for adjusting said piston to different elevational starting positions even during the operation of the apparatus.
Inventors
- 👤 Jiri Dokoupil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:20
CPC Classifications
C; C14; C14B; C14B1/00; C14B1/40
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
260 words
In an apparatus for working flat, flexible material by means of a first working member and a second working member, each working member having a respective working surface arranged to face the working surface of the other working member to provide a spacing between said working surface for feeding said flat, flexible material through said spacing, drive means operatively connected to said first working member for moving the first working member toward and away from the second working member whereby said spacing between the first and second working members is periodically decreased and increased and a working pressure is exerted on said material, wherein pressure means are operatively associated with one of said working members for adjusting said one working member to a starting position, said pressure means limiting the working pressure to a predetermined value by permitting a yielding of said one working member when the working pressure exceeds said predetermined value and until the working pressure is decreased again below said predetermined value, the improvement comprising a piston and cylinder means for confining a single pressure chamber in which said piston is movable, means for securing said cylinder means in a stationary position, said second working member being connected to said piston, means for connecting said pressure means to said single pressure chamber whereby said piston and with it said second working member are adjustable to said starting position and to perform said yielding, and reset means as well as means for locating said reset means in the cylinder means for exerting a reset force on said piston.
Claim 2
Dependent Claim
260 words
In an apparatus for working flat, flexible material by means of a first working member and a second working member, each working member having a respective working surface arranged to face the working surface of the other working member to provide a spacing between said working surface for feeding said flat, flexible material through said spacing, drive means operatively connected to said first working member for moving the first working member toward and away from the second working member whereby said spacing between the first and second working members is periodically decreased and increased and a working pressure is exerted on said material, wherein pressure means are operatively associated with one of said working members for adjusting said one working member to a starting position, said pressure means limiting the working pressure to a predetermined value by permitting a yielding of said one working member when the working pressure exceeds said predetermined value and until the working pressure is decreased again below said predetermined value, the improvement comprising a piston and cylinder means for confining a single pressure chamber in which said piston is movable, means for securing said cylinder means in a stationary position, said second working member being connected to said piston, means for connecting said pressure means to said single pressure chamber whereby said piston and with it said second working member are adjustable to said starting position and to perform said yielding, and reset means as well as means for locating said reset means in the cylinder means for exerting a reset force on said piston.
Claim 3
Dependent Claim
84 words
The apparatus according to claim 1, wherein said pressure means are hydraulic pressure means including a pump and a pressure responsive member, piping means for connecting said pump and said pressure responsive member to said single pressure chamber, and a fluid control valve in said connecting piping means for preventing during further operation of the apparatus the replenishing of a quantity of hydraulic working fluid which has been displaced through said pressure responsive member by the yielding of said piston and second working member.
Claim 4
Dependent Claim
18 words
The apparatus according to claim 2, wherein said pressure responsive member is adjustable for responding to different pressures.
Claim 5
Dependent Claim
75 words
The apparatus according to claim 1, wherein said pressure means are hydraulic pressure means including a pressure responsive member and a pump for continuously replenishing a quantity of hydraulic working fluid in response to the displacement of such fluid by the yielding of said piston and second working member, whereby said replenishing takes place during the increasing of said spacing between the first and second working members and thus during the periodically decreasing working pressure.
Claim 6
Dependent Claim
25 words
The apparatus according to claim 4, wherein said piston and cylinder means include cooperating stop means for defining outer limits of movement for said piston.
Claim 7
Dependent Claim
16 words
The apparatus according to claim 1, wherein said reset force exerting means is a compression spring.
Claim 8
Dependent Claim
123 words
The apparatus according to claim 6, wherein said piston has a longitudinal bore with an open end and a closed end, said compression spring locating means comprising a shaft having a threaded end and a flanged end, said shaft extending longitudinally through the compression spring so that one end of the spring rests on said flanged end of the shaft, an apertured closure member for closing said open end of the piston, said shaft extending through a central aperture of said closure member whereby the other end of said spring bears against said closure member inside said piston bore and whereby the threaded end of the shaft protRudes from said central aperture, and means for securing the threaded shaft end to said cylinder.
Claim 9
Dependent Claim
36 words
The apparatus according to claim 1, further comprising means for defining a selectively variable volume, means for connecting said variable volume to said pressure means, whereby the variable volume may be filled with a pressure medium.
Claim 10
Dependent Claim
23 words
The apparatus according to claim 8, wherein said pressure means include a single pump connected to said variable volume and to said cylinder.
Claim 11
Dependent Claim
67 words
The apparatus according to claim 8, wherein said means for defining a selectively variable volume comprise an auxiliary piston cylinder means, conduit means for connecting said auxiliary cylinder means to said pressure means, and means for selectively adjusting the position of said auxiliary piston means in said auxiliary cylinder means to define said variable volume between a surface of said auxiliary piston and said auxiliary cylinder means.
Claim 12
Dependent Claim
98 words
The apparatus according to claim 10, wherein said means for selectively adjusting the position of the auxiliary piston means comprises a threaded bore in said auxiliary cylinder means, a threaded shaft extending through said bore into the auxiliary cylinder meanS so that an end face of said shaft inside the cylinder means provides a stop for the auxiliary piston means, said threaded shaft having an end portion without threads extending out of said auxiliary cylinder means, and dial means on said end portion for indicating the extent to which the end face reaches into said auxiliary cylinder means.
Claim 13
Dependent Claim
87 words
The apparatus according to claim 10, wherein said auxiliary cylinder means is divided into two spaces above and below said auxiliary piston means, said means for connecting including a first conduit for connecting one of said spaces to said pressure means, said apparatus including further pressure means, a second conduit for connecting the other space to said further pressure means, a return conduit, and control valve means in said second conduit for selectively connecting the other space to said further pressure means and to said return conduit.
Claim 14
Dependent Claim
21 words
The apparatus according to claim 12, wherein said pressure means and said further pressure means are comprised in a single pump.
Claim 15
Dependent Claim
18 words
The apparatus according to claim 12, further comprising selectively adjustable pressure relief means connected to said second conduit.
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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |