Patent US3805679A successfully refreshed from Google Patents.
US3805679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Step-by-step linear adjustment devices
Assignee: Plessey Handel und Investments AG
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Filing: 1972-07-18
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Granted: 1974-04-23
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Expires: 1992-07-18
Abstract
Abstract A pneumatic inching device for a rod which is normally free to be coarsely set by hand in its longitudinal direction, comprises a pair of pistons slidingly fitted on the rod in a cylinder bore and respectively coupled to the rod during the forward stroke of each reciprocation of the piston by one of two coupling washers under the eccentric action of the inclined end face of a piston boss against a spring which tends to force the two coupling washers apart and into surface contact with perpendicular partitions. A sleeve of greater radius than the boss serves as end-of-stroke abutment and restores each washer to its unlocked perpendicular position irrespective of any return movement of the piston. Fluidic apparatus is also disclosed which permits repetitive operation of each inching piston and counts the number of piston reciprocations in the case where larger amounts of inching are required.
Inventors
- 👤 R Wray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:47
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/08; F15B11/12; F15B11/16; F15B11/18; Y; Y10; Y10T; Y10T403/00; Y10T403/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
288 words
A linear actuator device comprising a bar member guided for free longitudinal coarse-setting movement relative to a frame and having at opposite sides two outwardly facing guide surfaces extending longitudinally of the bar member, a coupling member reciprocable longitudinally of the bar member and having two complementary surfaces respectively facing the two guIde surfaces of the bar member with a small amount of clearance, resilient means biasing said coupling member in one direction longitudinally of the bar member, fixed stop means towards which the coupling member is thus biased, and which when fully engaged by the coupling member holds the latter in a position in which said two complementary surfaces are substantially parallel to the longitudinal direction of said two guide surfaces so as to allow free longitudinal movement of the bar member relative to the coupling member, an actuator member operable for reciprocatory movement relative to the frame longitudinally of the bar member independently of the latter and having an engagement portion which, during movement of the actuator member in a direction opposite to said one direction, will engage the coupling member at a point spaced from the bar member beyond one of said complementary surfaces to move the coupling member out of engagement with said stop means and, in co-operation with said resilient means, tilt said coupling member so as to cause opposite end portions of said complementary surfaces to lockingly engage said guide surfaces and to thereby couple said bar member for movement by said actuator member through said coupling member in said opposite direction, and means for returning the actuator member in said one direction, while permitting the coupling member, under the action of said resilient means to follow independently of the bar member
Claim 2
Dependent Claim
288 words
A linear actuator device comprising a bar member guided for free longitudinal coarse-setting movement relative to a frame and having at opposite sides two outwardly facing guide surfaces extending longitudinally of the bar member, a coupling member reciprocable longitudinally of the bar member and having two complementary surfaces respectively facing the two guIde surfaces of the bar member with a small amount of clearance, resilient means biasing said coupling member in one direction longitudinally of the bar member, fixed stop means towards which the coupling member is thus biased, and which when fully engaged by the coupling member holds the latter in a position in which said two complementary surfaces are substantially parallel to the longitudinal direction of said two guide surfaces so as to allow free longitudinal movement of the bar member relative to the coupling member, an actuator member operable for reciprocatory movement relative to the frame longitudinally of the bar member independently of the latter and having an engagement portion which, during movement of the actuator member in a direction opposite to said one direction, will engage the coupling member at a point spaced from the bar member beyond one of said complementary surfaces to move the coupling member out of engagement with said stop means and, in co-operation with said resilient means, tilt said coupling member so as to cause opposite end portions of said complementary surfaces to lockingly engage said guide surfaces and to thereby couple said bar member for movement by said actuator member through said coupling member in said opposite direction, and means for returning the actuator member in said one direction, while permitting the coupling member, under the action of said resilient means to follow independently of the bar member
Claim 3
Dependent Claim
126 words
A linear actuator device, as claimed in claim 1, wherein the bar member is a cylindrical rod which is slidable along the common axis of a pair of axially aligned cylinder bores and wherein the actuator member is a pair of pistons cooperating with each of the two cylinder bores and slidable on the rod, each piston having an axially projecting boss which extends towards the other piston and whose end face is provided with said engagement portion, the coupling member comprising a pair of washers fitting with slight radial clearance on the rod, and the resilient means is a helical spring interposed between the washers to urge the washers away from each other into respective contact with the engagement portions of the two piston bosses.
Claim 4
Dependent Claim
63 words
A linear actuator device as claimed in claim 2, wherein two stop means are provided and so arranged as to be respectively fully engaged by each washer at the fully retracted positions of the pistons, so that when each washer is held against its respective stop means by the spring, the washers are at right angles to the longitudinal direction of the rod.
Claim 5
Dependent Claim
55 words
A linear actuator device as claimed in claim 3 wherein a distance bush positioned between the two washers is of an internal radius greater than the radial distance of the engagement portion of each piston boss from the axis of the rod and of a length somewhat less than the distance between the two washers.
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) | 1977-04-22 | 1977-10-22 | 1978-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-22 | 1981-10-22 | 1982-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-22 | 1985-10-22 | 1986-04-23 | $7700.00 | Window Closed / Lapsed |