US3590582A
Expired / Lapsed
US
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Work control system
Assignee: Aro Corp
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Filing: 1968-10-09
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Granted: 1971-07-06
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Expires: 1988-10-09
Abstract
Abstract A device for controlling work output of pneumatic tools such as a wrench. The device includes a pair of pressure sensing valves and a pair of pneumatic timing devices which operate to control a three-way air supply valve in the air line to the tool. After the sensing valves sense the proper pressure sequence in the air line indicating application of a load to the tool, the three-way valve remains open for a preselected increment of time controlled by the first timer. Thus, the tool is driven for this preselected increment of time. The three-way valve is then closed, and the second timer insures that the three-way valve remains closed and the tool remains without power for a second preselected increment of time. The device automatically resets so that the sequence of operation may be repeated.
Inventors
- 👤 Dale F German
- 👤 R Stanford Short
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:39
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/02; B; B25; B25B; B25B23/00; B25B23/14; B25B23/145; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20538; F15B2211/21; F15B2211/212; F15B2211/40; F15B2211/405; F15B2211/40507; F15B2211/415; F15B2211/41509; F15B2211/50; F15B2211/505; F15B2211/50554; F15B2211/52; F15B2211/60; F15B2211/625; F15B2211/70; F15B2211/705; F15B2211/75; F15B2211/76; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86389; Y10T137/86405; Y10T137/86413; Y10T137/86445
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
150 words
A work-control device for controlling work output of fluid driven apparatus comprising, in combination: a fluid inlet from a fluid source; a fluid outlet to said fluid-driven apparatus; fluid flow conduit means between said inlet and outlet; valve means in said conduit means for stopping fluid flow therethrough; and control means for said valve means, said control means logically responsive to change in fluid pressures in said conduit means and thus logically responsive to change in fluid consumption of said driven apparatus, said control means including first means to sense free-running operation of said fluid-driven apparatus and second means to subsequently sense non-free-running operation of said fluid-driven apparatus due to increased resistance to the operation being performed by said fluiddriven apparatus, said control means also including means to maintain said valve means open for a measurement increment of time in response to non-free-running operation as sensed by said second means.
Claim 2
Dependent Claim
150 words
A work-control device for controlling work output of fluid driven apparatus comprising, in combination: a fluid inlet from a fluid source; a fluid outlet to said fluid-driven apparatus; fluid flow conduit means between said inlet and outlet; valve means in said conduit means for stopping fluid flow therethrough; and control means for said valve means, said control means logically responsive to change in fluid pressures in said conduit means and thus logically responsive to change in fluid consumption of said driven apparatus, said control means including first means to sense free-running operation of said fluid-driven apparatus and second means to subsequently sense non-free-running operation of said fluid-driven apparatus due to increased resistance to the operation being performed by said fluiddriven apparatus, said control means also including means to maintain said valve means open for a measurement increment of time in response to non-free-running operation as sensed by said second means.
Claim 3
Dependent Claim
21 words
The work control device of claim 1 wherein said control means includes means responsive to absolute pressures in said conduit means.
Claim 4
Dependent Claim
17 words
The work control device of claim 2 wherein said means logically responsive to absolute pressures is adjustable.
Claim 5
Dependent Claim
39 words
The work-control device of claim 1 including means for effecting a pressure drop Between said inlet and said outlet and wherein said control means is operative to sense the operation of said driven apparatus by sensing said pressure drop.
Claim 6
Dependent Claim
16 words
The work control device of claim 1 wherein said means for effecting pressure drop is adjustable.
Claim 7
Dependent Claim
25 words
The work control device of claim 1 wherein said control means includes means for resetting said work-control device subsequent to said measured increment of time.
Claim 8
Dependent Claim
47 words
The work-control device of claim 6 wherein said means for resetting includes second timing means responsive to said control means, said second timing means operative to provide a dwell increment of time during which said driven apparatus is not provided with fluid from said fluid flow source.
Claim 9
Dependent Claim
19 words
The work-control device of claim 1 wherein said control means includes means for adjusting said measured increment of time.
Claim 10
Dependent Claim
22 words
The work-control device of claim 1 including fluid flow regulator means in said conduit means intermediate said inlet and said valve means.
Claim 11
Dependent Claim
182 words
A work-control device for controlling work output of fluid-driven apparatus comprising, in combination: a fluid conduit having an inlet and an outlet, said inlet being connectable to a fluid source and said outlet being connectable to said fluid-driven apparatus; restrictor means in said conduit intermediate said inlet and said outlet; a valve in said conduit intermediate said inlet and said outlet; control means for said valve including first pressure sensor means for sensing a first absolute pressure in said conduit downstream of said restrictor and providing a signal, said first absolute pressure being less than line pressure to said apparatus; second pressure sensor means for sensing a second absolute pressure following said signal of said first sensor means and providing a second signal, said second absolute pressure being less than said first pressure and greater than pressure to said apparatus when said apparatus is operating without load, and first timing means actuated by said signal of second sensor means sensing said second absolute pressure, said first timing means operative to actuate said valve to said apparatus following a first increment of time.
Claim 12
Dependent Claim
182 words
A work-control device for controlling work output of fluid-driven apparatus comprising, in combination: a fluid conduit having an inlet and an outlet, said inlet being connectable to a fluid source and said outlet being connectable to said fluid-driven apparatus; restrictor means in said conduit intermediate said inlet and said outlet; a valve in said conduit intermediate said inlet and said outlet; control means for said valve including first pressure sensor means for sensing a first absolute pressure in said conduit downstream of said restrictor and providing a signal, said first absolute pressure being less than line pressure to said apparatus; second pressure sensor means for sensing a second absolute pressure following said signal of said first sensor means and providing a second signal, said second absolute pressure being less than said first pressure and greater than pressure to said apparatus when said apparatus is operating without load, and first timing means actuated by said signal of second sensor means sensing said second absolute pressure, said first timing means operative to actuate said valve to said apparatus following a first increment of time.
Claim 13
Dependent Claim
19 words
The device of claim 10 wherein said first timing means closes said valve following said first increment of time.
Claim 14
Dependent Claim
32 words
The control device of claim 10 wherein said control means includes second timing means operative to deactuate said valve following a second predetermined increment of time after said first increment of time.
Claim 15
Dependent Claim
30 words
The work-control device of claim 10 wherein said control means includes reset means to recycle said control device for another first increment of time during which said apparatus is operative.
Claim 16
Dependent Claim
13 words
The work-control device of claim 10 including regulator means in said fluid conduit.
Claim 17
Dependent Claim
168 words
A work-control device for controlling work output of fluid-driven apparatus comprising, in combination: a fluid conduit having an inlet and an outlet, said inlet being connectable to a fluid source and said outlet being connectable to said fluid-driven apparatus; restrictor means in said conduit between said inlet and said outlet; a valve in said conduit intermediate said inlet and said outlet; and control means for said valve comprising first pressure-differential-sensing means for sensing pressure differential in said conduit across said restrictor and providing a signal whenever said pressure differential exists, second pressure-differential-sensing means for sensing pressure differential in said conduit across said restrictor and providing a signal when said first pressure-differential-sensing means provides a signal and said pressure differential is less than the difference between said line pressure and pressure in said line when said fluid-driven apparatus is operated under no load, first timing means for actuating said valve following a first increment of time whenever said second pressure-differential-sensing means provides a signal to said first timing Means.
Claim 18
Dependent Claim
168 words
A work-control device for controlling work output of fluid-driven apparatus comprising, in combination: a fluid conduit having an inlet and an outlet, said inlet being connectable to a fluid source and said outlet being connectable to said fluid-driven apparatus; restrictor means in said conduit between said inlet and said outlet; a valve in said conduit intermediate said inlet and said outlet; and control means for said valve comprising first pressure-differential-sensing means for sensing pressure differential in said conduit across said restrictor and providing a signal whenever said pressure differential exists, second pressure-differential-sensing means for sensing pressure differential in said conduit across said restrictor and providing a signal when said first pressure-differential-sensing means provides a signal and said pressure differential is less than the difference between said line pressure and pressure in said line when said fluid-driven apparatus is operated under no load, first timing means for actuating said valve following a first increment of time whenever said second pressure-differential-sensing means provides a signal to said first timing Means.
Claim 19
Dependent Claim
19 words
The device of claim 15 wherein said first timing means closes said valve following said first increment of time.
Claim 20
Dependent Claim
31 words
The work control device of claim 15 wherein said control means includes second timing means operable to deactuate said valve a second increment of time following said first increment of time.
Claim 21
Dependent Claim
13 words
The work-control device of claim 17 wherein said second timing means is adjustable.
Claim 22
Dependent Claim
13 words
The work-control device of claim 15 wherein said first timing means is adjustable.
Claim 23
Dependent Claim
13 words
The work-control device of claim 15 including a regulator in said fluid 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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |