US4400878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knife blade holder
Assignee: G & R SCREW MACHINE PRODUCTS Inc A CORP OF MA
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Filing: 1981-10-05
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Granted: 1983-08-30
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Expires: 2001-10-05
Abstract
Abstract A holder for an interchangeable knife blade comprising a handle, a chuck adapted to be threaded into the handle. The chuck has a bifurcated forward end defining a lengthwise slot for receiving a flat cutting blade, the bifurcated end defining a cam surface tapering outwardly toward the forward end to a major dimension. A tubular elastomeric ferrule is mounted on the chuck for longitudinal sliding movement relative to the chuck. The ferrule extends between the handle and the cam surface when the chuck is partially threaded into the bore, so that additional threading of the chuck into the bore causes the ferrule to slide forwardly over the cam surface. In this way, the forward end of the ferrule is stretched, thereby transmitting a clamping pressure against a blade which is located in the slot.
Inventors
- 👤 Richard E. Vaudreuil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 15:58
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/32; A61B17/3209; A61B17/3211; A61B17/3213; B; B25; B25G; B25G3/00; B25G3/02; B25G3/10; B25G3/12; B25G3/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
179 words
Holder for interchangeable knife blade, comprising: (a) a handle which has a threaded bore at one end, (b) a chuck which has a forward portion and a rearward portion, the rewarward portion being adapted for threading into said bore, the forward portion being bifurcated to define a lengthwise slot for receiving a flat cutting blade, said chuck having an external cam surface adjacent the forward end of said forward portion, said cam surface tapering outwardly toward said forward end to a major dimension, and (c) a tubular elastomeric ferrule mounted on the chuck for longitudinal sliding movement relative to the chuck, said ferrule extending between the handle and the cam surface when the chuck is partially threaded into the bore so that additional threading of the chuck into the bore causes the ferrule to slide forwardly over the cam surface, the inner dimension of said ferrule being substantially less than said major dimension, so that the ferrule is stretched as it approaches said major dimension, thereby transmitting a clamping pressure against a blade which is located in the slot.
Claim 2
Dependent Claim
179 words
Holder for interchangeable knife blade, comprising: (a) a handle which has a threaded bore at one end, (b) a chuck which has a forward portion and a rearward portion, the rewarward portion being adapted for threading into said bore, the forward portion being bifurcated to define a lengthwise slot for receiving a flat cutting blade, said chuck having an external cam surface adjacent the forward end of said forward portion, said cam surface tapering outwardly toward said forward end to a major dimension, and (c) a tubular elastomeric ferrule mounted on the chuck for longitudinal sliding movement relative to the chuck, said ferrule extending between the handle and the cam surface when the chuck is partially threaded into the bore so that additional threading of the chuck into the bore causes the ferrule to slide forwardly over the cam surface, the inner dimension of said ferrule being substantially less than said major dimension, so that the ferrule is stretched as it approaches said major dimension, thereby transmitting a clamping pressure against a blade which is located in the slot.
Claim 3
Dependent Claim
23 words
Holder as recited in claim 1, wherein a stop means is provided to prevent the ferrule from moving forwardly beyond said major dimension.
Claim 4
Dependent Claim
36 words
Holder as recited in claim 2, wherein the stop means comprises: (a) a rearwardly facing external shoulder on the chuck, and (b) a forwardly facing internal shoulder within the ferrule adapted for engaging said external shoulder.
Claim 5
Dependent Claim
21 words
Holder as recited in claim 1, wherein the interior surface of the ferrule is cylindrical and the cam surface is frusto-conical.
Claim 6
Dependent Claim
16 words
Holder as recited in claim 1, wherein the ferrule is formed of an elastomeric thermoplastic material.
Claim 7
Dependent Claim
13 words
Holder as recited in claim 5, wherein said elastomeric thermoplastic material is acetal.
References Cited (Backward Citations)
US2507872A
Cited
US3934591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |