Patent US3708881A successfully refreshed from Google Patents.
US3708881A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi position adjustable roofing knife
Assignee: Individual
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Filing: 1971-03-22
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Granted: 1973-01-09
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Expires: 1991-03-22
Abstract
Abstract A craftsman''s utility knife or ''''roofing'''' knife with an elongated hollow casing slidingly accommodating a bladeholder slider indexable between a retracted position and plurality of extended cutting positions, with an extreme protruding position for loading or changing blades at the cutting end of the slider and a reverse extreme access position for inserting and removing extra blades from a blade storage chamber at the opposite end of the slider.
Inventors
- 👤 R Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:24
CPC Classifications
B; B26; B26B; B26B5/00; B26B5/001
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
201 words
A manually indexable blade holder assembly comprising: A. an elongated open-ended hollow tubular casing provided with a longitudinal slideway extending therethrough from an open front portal to an open rear portal and having a longitudinal slot opening outwardly therefrom through the upper portion of the casing; B. a unitary bladeholder slider movably positioned in the slideway for longitudinal sliding engagement therewith and having a bladeholder cavity at a forward end for anchoring engagement of a cutting blade in variably extended projection from the forward end of the casing in each of said plurality of adjusted positions of the slider, and a blade storage cavity at a rearward end for storing a cutting blade therein, said storage cavity being provided with a peripheral bounding rim encircling the edge of a blade stored therein to shield its cutting edge against inadvertent contact; C. an upwardly facing shoulder formed on the slider and resiliently depressible by force applied through the longitudinal slot; and D. a plurality of downwardly facing concave index notches formed in the casing opening toward the slideway and positioned for engagement with the shoulder of the bladeholder slider in a plurality of different adjusted positions of the slider in the slideway.
Claim 2
Dependent Claim
201 words
A manually indexable blade holder assembly comprising: A. an elongated open-ended hollow tubular casing provided with a longitudinal slideway extending therethrough from an open front portal to an open rear portal and having a longitudinal slot opening outwardly therefrom through the upper portion of the casing; B. a unitary bladeholder slider movably positioned in the slideway for longitudinal sliding engagement therewith and having a bladeholder cavity at a forward end for anchoring engagement of a cutting blade in variably extended projection from the forward end of the casing in each of said plurality of adjusted positions of the slider, and a blade storage cavity at a rearward end for storing a cutting blade therein, said storage cavity being provided with a peripheral bounding rim encircling the edge of a blade stored therein to shield its cutting edge against inadvertent contact; C. an upwardly facing shoulder formed on the slider and resiliently depressible by force applied through the longitudinal slot; and D. a plurality of downwardly facing concave index notches formed in the casing opening toward the slideway and positioned for engagement with the shoulder of the bladeholder slider in a plurality of different adjusted positions of the slider in the slideway.
Claim 3
Dependent Claim
38 words
The assembly defined in claim 1, wherein the slider shoulder is formed on a depressible control knob protruding outwardly through the casing slot, whereby force applied to depress the control knob disengages the shoulder from the index notches.
Claim 4
Dependent Claim
49 words
The assembly defined in claim 1, wherein the slider is provided with a resiliently depressible arm incorporating the shoulder and terminating in a control knob protruding outwardly through the casing slot, whereby force applied to the control knob resiliently depresses the arm disengaging the shoulder from the index notches.
Claim 5
Dependent Claim
46 words
The assembly defined in claim 1, wherein the casing is provided with a forward terminal index notch positioned for engagement with the shoulder at an adjusted terminal position of the slider exposing the bladeholder cavity for insertion of a cutting blade therein or its removal therefrom.
Claim 6
Dependent Claim
48 words
The assembly defined in claim 1, wherein the casing is provided with a Rearward terminal index notch positioned for engagement with the shoulder at an adjusted terminal position of the slider exposing the blade storage cavity for removal of a stored cutting blade therefrom or its insertion therein.
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |