Patent EP0559445A1 successfully refreshed from Google Patents.
US3563285A
Expired / Lapsed
US
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Band saw guide and apparatus
Assignee: Masonite Corp
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Filing: 1969-07-10
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Granted: 1971-02-16
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Expires: 1989-07-10
Abstract
Abstract A band saw of the commercial type employed in lumber mills having a pair of spaced apart first and second wheels and a continuous saw blade or band entrained around said wheels, an improved saw guide and apparatus comprising one or more springs yieldably urging the first wheel in a direction generally away from the second wheel to apply tension to the saw blade; and a rapid response-low inertia saw guide that will eliminate or substantially reduce momentary slack in the saw band while maintaining the cutting edge of the blade in a predetermined cutting plane. In a band saw of the kind described, the saw guide being more particularly characterized in that it is disposed intermediate the first and second wheels and comprises a contact member positioned to engage the inside surface of the blade as the blade moves from the first wheel toward the second wheel, the contact member having a first contact portion that provides a fixed line of contacts forward of an imaginary line connecting the points of tangency between the wheels and a movable contact portion that contacts the blade in a region intermediate the first contact portion and the first wheel; and a rapid response-low inertia means urging the movable contact portion against the saw blade to maintain tension in that area of the blade between the first wheel and the fixed line of contacts.
Inventors
- 👤 Elbridge W Thrasher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:33
CPC Classifications
B; B27; B27B; B27B13/00; B27B13/10; Y; Y10; Y10T; Y10T83/00; Y10T83/707; Y10T83/7226; Y10T83/7239; Y10T83/7251; Y10T83/7264
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
188 words
A band saw having a pair of spaced apart first and second wheels; a continuous saw blade entrained around said wheels; yieldable means urging said first wheel in a direction generally away from the second wheel to apply tension to said saw blade; and a saw guide for taking up momentary slack in said blade to eliminate blade vibrations while maintaining said blade in a predetermined cutting plane, said saw guide being disposed intermediate said first and second wheels and comprising a contact member positioned to engage the inside surface of said blade as the blade moves from said first wheel toward said second wheel, said contact member having a first contact portion that provides a fixed line of contacts forward of an imaginary line connecting the points of tangency between said wheels and a movable contact portion that contacts said blade in a region intermediate said first contact portion and said first wheel; and a rapid response-low inertia means urging said movable contact portion against said blade to maintain tension in that area of the saw blade between said first wheel and the fixed line of contacts.
Claim 2
Dependent Claim
188 words
A band saw having a pair of spaced apart first and second wheels; a continuous saw blade entrained around said wheels; yieldable means urging said first wheel in a direction generally away from the second wheel to apply tension to said saw blade; and a saw guide for taking up momentary slack in said blade to eliminate blade vibrations while maintaining said blade in a predetermined cutting plane, said saw guide being disposed intermediate said first and second wheels and comprising a contact member positioned to engage the inside surface of said blade as the blade moves from said first wheel toward said second wheel, said contact member having a first contact portion that provides a fixed line of contacts forward of an imaginary line connecting the points of tangency between said wheels and a movable contact portion that contacts said blade in a region intermediate said first contact portion and said first wheel; and a rapid response-low inertia means urging said movable contact portion against said blade to maintain tension in that area of the saw blade between said first wheel and the fixed line of contacts.
Claim 3
Dependent Claim
36 words
The band saw of claim 1, said yieldable means having a rapid response and low inertia and comprising a device that applies a variable force proportional to the instantaneous distance between said first and second wheels.
Claim 4
Dependent Claim
51 words
The band saw of claim 1, said yieldable means comprising a lever that supports said first wheel and one or more spring devices connected to said lever for counterbalancing the weight of said first wheel and resiliently urging said first wheel away form the second wheel to tEnsion said saw blade.
Claim 5
Dependent Claim
157 words
In combination with a band saw having a pair of space apart wheels; a continuous saw blade entrained around said wheels; yieldable means urging one of said wheels in a direction generally away from the other to apply tension to said saw blade; and a saw guide for taking up momentary slack in said blade to eliminate blade vibrations while maintaining said blade in a predetermined cutting plane, said saw guide being disposed intermediate said wheels and comprising a contact member positioned to engage the inside surface of said blade, said contact member having a first contact portion that provides a fixed line of contacts and a movable contact portion that contacts said blade intermediate the first contact portion and the nearest wheel; and a rapid response-low inertia means urging said movable contact portion against said blade to maintain tension in that area of the saw blade between said nearest wheel and the fixed line of contacts.
Claim 6
Dependent Claim
157 words
In combination with a band saw having a pair of space apart wheels; a continuous saw blade entrained around said wheels; yieldable means urging one of said wheels in a direction generally away from the other to apply tension to said saw blade; and a saw guide for taking up momentary slack in said blade to eliminate blade vibrations while maintaining said blade in a predetermined cutting plane, said saw guide being disposed intermediate said wheels and comprising a contact member positioned to engage the inside surface of said blade, said contact member having a first contact portion that provides a fixed line of contacts and a movable contact portion that contacts said blade intermediate the first contact portion and the nearest wheel; and a rapid response-low inertia means urging said movable contact portion against said blade to maintain tension in that area of the saw blade between said nearest wheel and the fixed line of contacts.
Claim 7
Dependent Claim
105 words
The combination of claim 4, said saw guide comprising a leaf spring supported at one end and in back of said contact member yieldably urging said contact member against the inner surface of said saw blade, one end of said leaf spring being relatively fixed to maintain one portion of said contact member in a fixed guide plane, the other end of said leaf spring applying a resilient force against another portion of said contact member to tension the saw blade in a region intermediate the saw guide and that wheel which tends to produce slack in the saw blade by overrunning the other wheel.
Claim 8
Dependent Claim
51 words
The apparatus of claim 4, said contact member providing a contact surface forward of an imaginary line connecting the points of tangency between said wheels, said yieldable means effecting a separation of said wheels and imposing a tension in the means for urging portions of said contact member against said blade.
Claim 9
Dependent Claim
114 words
The combination of claim 4, said saw guides comprising a leaf spring having a width approximately that of the saw blade, a flexible wear plate of approximately the same width as said leaf spring and mounted in front of said leaf spring for making contact with said saw blade, means for mounting one end of said leaf spring and one end of said wear plate in a predetermined guide plane, the other end of said leaf spring and wear plate being movable and imparting a resilient force against said blade, said one end of said wear plate providing a contact surface forward of an imaginary line connecting the points of tangency between said wheels.
Claim 10
Dependent Claim
54 words
The combination of claim 7, said saw guides further comprising a rigid backing member, a resilient pad disposed in back of said leaf spring between said leaf spring and said rigid backing member, and means for adjustably positioning said backing member to compress said resilient pad against the back surface of said leaf spring.
Claim 11
Dependent Claim
146 words
In combination with a band saw having a pair of spaced apart wheels; a continuous saw blade entrained around said wheels; yieldable means urging one of said wheels in a direction generally away from the other to apply tension to said blade, said yieldable means comprising a device that applies a variable force proportional to the instantaneous distance between said pair of spaced apart wheels; and a pair of saw guides engaged with the working sides of said saw blade and disposed on opposite sides of the working area, one of said saw guides comprising a contact member positioned to engage the inside surface of said blade, said contact member having a first contact portion that provides a fixed guiding surface and a movable contact portion; and a rapid response-low inertia means urging said movable contact portion against said blade to maintain tension in the blade.
Claim 12
Dependent Claim
146 words
In combination with a band saw having a pair of spaced apart wheels; a continuous saw blade entrained around said wheels; yieldable means urging one of said wheels in a direction generally away from the other to apply tension to said blade, said yieldable means comprising a device that applies a variable force proportional to the instantaneous distance between said pair of spaced apart wheels; and a pair of saw guides engaged with the working sides of said saw blade and disposed on opposite sides of the working area, one of said saw guides comprising a contact member positioned to engage the inside surface of said blade, said contact member having a first contact portion that provides a fixed guiding surface and a movable contact portion; and a rapid response-low inertia means urging said movable contact portion against said blade to maintain tension in the blade.
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |