Patent US3633435A successfully refreshed from Google Patents.
US3633435A
Expired / Lapsed
US
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Bidirectional force override
Assignee: McDonnell Douglas Corp
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Filing: 1970-11-02
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Granted: 1972-01-11
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Expires: 1990-11-02
Abstract
Abstract Bidirectional force override mechanisms one embodiment of which includes a first link with one end pivotally connected to a reciprocating input rod and with the other end pivotally connected to the end of a second link, the other end of which is pivotally attached to an output link which is itself pivotally mounted to rotate about a stationary pivot. The output link is further interconnected to the first link by a spring connected therebetween which acts to preload the pivotal joints of the second link and to provide relatively constant force override action which allows relative movement between the input rod and the output link when more than a predetermined load is applied in either direction across the mechanism.
Inventors
- 👤 Alton E Farr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:45
CPC Classifications
F; F16; F16H; F16H21/00; F16H21/10; F16H21/44; B; B64; B64C; B64C13/00; B64C13/24; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20006; Y10T74/20576; Y10T74/20582; Y10T74/206; Y10T74/20612; Y10T74/20618
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
229 words
A bidirectional force override mechanism including: a first link having first and second end portions; a second link having first and second end portions; first pivot means connecting said second end portion of said first link for rotation to said first end portion of said second link, said first pivot means including means to restrict the rotation between said first and second links in a first predetermined direction thereabout when said first and second links have a first predetermined angle therebetween; a third link connected for rotation about a point; second pivot means connecting said second end portion of said second link for rotation to said third link, said second pivot means including means to restrict the rotation between said second and third links in a second predetermined direction thereabout opposite from said first predetermined direction when said second and third links have a second predetermined angle therebetween; and bias means operatively connected between said first and third links to exert a predetermined force across said mechanism; whereby when connecting linkage is connected to said first end portion of said first link and to said third link movements and forces are transmitted through said mechanism until the forces exceed a predetermined value at which time said bias means are overcome and said first link pivots with respect to said third link to disconnect movements otherwise transmitted through said mechanism.
Claim 2
Dependent Claim
229 words
A bidirectional force override mechanism including: a first link having first and second end portions; a second link having first and second end portions; first pivot means connecting said second end portion of said first link for rotation to said first end portion of said second link, said first pivot means including means to restrict the rotation between said first and second links in a first predetermined direction thereabout when said first and second links have a first predetermined angle therebetween; a third link connected for rotation about a point; second pivot means connecting said second end portion of said second link for rotation to said third link, said second pivot means including means to restrict the rotation between said second and third links in a second predetermined direction thereabout opposite from said first predetermined direction when said second and third links have a second predetermined angle therebetween; and bias means operatively connected between said first and third links to exert a predetermined force across said mechanism; whereby when connecting linkage is connected to said first end portion of said first link and to said third link movements and forces are transmitted through said mechanism until the forces exceed a predetermined value at which time said bias means are overcome and said first link pivots with respect to said third link to disconnect movements otherwise transmitted through said mechanism.
Claim 3
Dependent Claim
51 words
The mechanism defined in claim 1 wherein said bias means include at least one spring, said spring being connected to said first link and said third link so that said spring is normally equidistant from said first and second pivot means and so said spring acts perpendicular to a line therebetween.
Claim 4
Dependent Claim
82 words
The mechanism defined in claim 1 wherein said means to restrict rotation between said first and second links include: an abutment surface on one of said first and second links; and an adjustable abutment member connected to the other of said first and sEcond links in position to abut said abutment surface when said bias means are not overcome, said adjustable abutment member being extendable and retractable so that said first predetermined angle between said first and second links can be adjusted.
Claim 5
Dependent Claim
58 words
The mechanism defined in claim 1 including: second means associated with said first pivot means to restrict the rotation between said first and second links in the direction opposite to said first predetermined direction when said bias means are overcome and said first and second links therefore have a different predetermined angle from said first predetermined angle therebetween.
Claim 6
Dependent Claim
82 words
The mechanism defined in claim 4 wherein said second means for restricting rotation between said first and second links include: an abutment surface on one of said first and second links and an adjustable abutment member connected to the other of said first and second links in position to abut said abutment surface when said bias means are overcome, said adjustable abutment member being extendable and retractable so that said different predetermined angle between said first and second links can be adjusted.
Claim 7
Dependent Claim
202 words
A bidirectional force override mechanism including: first linkage means pivotally mounted for rotation with respect to a reference structure, said first linkage means having means incorporated therewith for connection to movements and forces from outside said mechanism; second linkage means having means incorporated therewith for connection to movements and forces from outside said mechanism; bias means connected between said first and second linkage means to apply a predetermined force therebetween; first pivot means rotatably connecting said first linkage means to said second linkage means; and second pivot means rotatably connecting said first linkage means to said second linkage means, said first and second pivot means being positioned on opposite sides of the line of force of said bias means and on a line generally perpendicular to the line of force so that when force applied across said mechanism from outside said mechanism reaches a predetermined value in a first direction, said second linkage means rotate about said first pivot means straining said bias means and when force applied across said mechanism from outside said mechanism reaches a predetermined value in a direction opposite to said first direction, said second linkage means rotate about said second pivot means also straining said bias means.
Claim 8
Dependent Claim
202 words
A bidirectional force override mechanism including: first linkage means pivotally mounted for rotation with respect to a reference structure, said first linkage means having means incorporated therewith for connection to movements and forces from outside said mechanism; second linkage means having means incorporated therewith for connection to movements and forces from outside said mechanism; bias means connected between said first and second linkage means to apply a predetermined force therebetween; first pivot means rotatably connecting said first linkage means to said second linkage means; and second pivot means rotatably connecting said first linkage means to said second linkage means, said first and second pivot means being positioned on opposite sides of the line of force of said bias means and on a line generally perpendicular to the line of force so that when force applied across said mechanism from outside said mechanism reaches a predetermined value in a first direction, said second linkage means rotate about said first pivot means straining said bias means and when force applied across said mechanism from outside said mechanism reaches a predetermined value in a direction opposite to said first direction, said second linkage means rotate about said second pivot means also straining said bias means.
Claim 9
Dependent Claim
33 words
The mechanism defined in claim 6 wherein said first pivot means include: first means for restricting the rotation of said first linkage means with respect to said second linkage in a predetermined direction.
Claim 10
Dependent Claim
43 words
The mechanism defined in claim 7 wherein said first pivot means also include: second means for restricting the rotation of said first linkage means with respect to said second linkage in a direction opposite to the restricted direction of said first restricting means.
Claim 11
Dependent Claim
22 words
The mechanism defined in claim 6 wherein said bias means include: a spring positioned equidistant from said first and second pivot means.
Claim 12
Dependent Claim
54 words
The mechanism defined in claim 6 wherein said means incorporated in said second linkage means for connection to movements and forces from outside said mechanism include: a reciprocating rod connected to said second linkage means for applying movements and forces thereto generally at right angles to the link of force of said bias means.
References Cited (Backward Citations)
US2881631A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |