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Patent US3742800A successfully refreshed from Google Patents.
US3742800A
Expired / Lapsed
US
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Constant flexure stress energy storing beam
Assignee: University of Minnesota Twin Cities
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Filing: 1972-01-10
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Granted: 1973-07-03
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Expires: 1992-01-10
Abstract
Abstract A flexural energy storing beam for use with punching and printing hammers in computers and high speed data processors, said beam having a contour optimized according to the energy input whereby in the bending of the beam the maximum principal stress is constant at every cross section of the beam.
Inventors
- 👤 D Frohrib
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:20
CPC Classifications
B; B41; B41J; B41J9/00; B41J9/26; B41J9/36; G; G06; G06K; G06K1/00; G06K1/02; Y; Y10; Y10T; Y10T83/00; Y10T83/869; Y10T83/8765; Y10T83/8776; Y10T83/8782; Y10T83/8784; Y10T83/8798
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
166 words
An improved impact output device of the type having an end mass, an impact key attached to the end mass positioned to perform an impact function relative to a parent structure, at least two flexural energy storing members attached at one end to the end mass and cantileverly attached at the other end to said parent structure, and means for deflecting, holding and releasing said energy storing members to cause said impact key to perform said impact function, wherein: said energy storing members are disposed in parallel facing relationship and each said flexural energy storing member is a slender beam having an optimized contour profile of varying thickness matched to the energy input to the beam and having a minimum thickness at a point 1/3 the length of the beam from the end mass attaching end to the parent structure attaching end whereby the maximum principal stress at all points along the beam is the same when said deflecting means is operative to flex said beam.
Claim 2
Dependent Claim
166 words
An improved impact output device of the type having an end mass, an impact key attached to the end mass positioned to perform an impact function relative to a parent structure, at least two flexural energy storing members attached at one end to the end mass and cantileverly attached at the other end to said parent structure, and means for deflecting, holding and releasing said energy storing members to cause said impact key to perform said impact function, wherein: said energy storing members are disposed in parallel facing relationship and each said flexural energy storing member is a slender beam having an optimized contour profile of varying thickness matched to the energy input to the beam and having a minimum thickness at a point 1/3 the length of the beam from the end mass attaching end to the parent structure attaching end whereby the maximum principal stress at all points along the beam is the same when said deflecting means is operative to flex said beam.
Claim 3
Dependent Claim
23 words
The impact output device of claim 1 including: stress relieving fillets at points of stress concentration on each said flexural energy storing member.
Claim 4
Dependent Claim
24 words
The impact output device of claim 2 wherein the means for deflecting the flexural energy storing members include: means for electromagnetically deflecting said beams.
Claim 5
Dependent Claim
147 words
An improved impact output device for use with computers and data processors including: an end mass; an impact element attached to the end mass in a position to perform an impact function; at least two flexural energy storing members attached at one end to the end mass and at the other end to a parent structure, each said member having a contour profile according to the equations: to (x)/to (1) (3 x - 1/2) 1/2 in the region 1/3 + Delta < or = x < or = 1 to (x)/to (1) (1 - 3 x/2) 1/2 in the region of 0 < or = x < or = 1/3 - Delta to (x)/to (1) (3 Delta /2 ) 1/2 in the region 1/3 - Delta < or = x < or = 1/3 + Delta and means for deflecting, holding and releasing said energy storing members.
Claim 6
Dependent Claim
147 words
An improved impact output device for use with computers and data processors including: an end mass; an impact element attached to the end mass in a position to perform an impact function; at least two flexural energy storing members attached at one end to the end mass and at the other end to a parent structure, each said member having a contour profile according to the equations: to (x)/to (1) (3 x - 1/2) 1/2 in the region 1/3 + Delta < or = x < or = 1 to (x)/to (1) (1 - 3 x/2) 1/2 in the region of 0 < or = x < or = 1/3 - Delta to (x)/to (1) (3 Delta /2 ) 1/2 in the region 1/3 - Delta < or = x < or = 1/3 + Delta and means for deflecting, holding and releasing said energy storing members.
Claim 7
Dependent Claim
23 words
The impact output device of claim 4 including: stress relieving fillets at points of stress concentration on each said flexural energy storing member.
Claim 8
Dependent Claim
118 words
A flexural energy storing member including: a slender beam for cantileverly attaching one end to a parent structure and for attaching the other end to an end mass, said beam having a contour profile of varying thickness optimized according to an energy input acting on a flexure bundle comprised of at least two of said members, said energy input in the form of a transverse load having a centroid acting in line with a point 1/3 the length of the beam from the end mass attaching end to the parent structure attaching end, said beam having a minimum thickness at said point 1/3 the length of the beam whereby the maximum principal stress along the beam is constant.
Claim 9
Dependent Claim
118 words
A flexural energy storing member including: a slender beam for cantileverly attaching one end to a parent structure and for attaching the other end to an end mass, said beam having a contour profile of varying thickness optimized according to an energy input acting on a flexure bundle comprised of at least two of said members, said energy input in the form of a transverse load having a centroid acting in line with a point 1/3 the length of the beam from the end mass attaching end to the parent structure attaching end, said beam having a minimum thickness at said point 1/3 the length of the beam whereby the maximum principal stress along the beam is constant.
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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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |