Patent US3848502A successfully refreshed from Google Patents.
US3848502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety device for protecting an operator{40 s hands
Assignee: Individual
•
Filing: 1973-11-05
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Granted: 1974-11-19
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Expires: 1993-11-05
Abstract
Abstract A safety device for protecting an operator''s hands from the cutting edge of the blade of a band saw characterized by a shield disposed in a protective relationship with the blade and supported for rectilinear reciprocation along a path paralleling the plane of the blade, a double-acting pneumatic cylinder for imparting rectilinear motion to the shield, and a feeler disposed in juxtaposition with the shield and connected therewith for initiating operation of the cylinder in response to an engagement therewith of a selected workpiece as the workpiece is advanced toward the blade.
Inventors
- 👤 Neill E O
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:59
CPC Classifications
F; F16; F16P; F16P3/00; B; B27; B27G; B27G19/00; B27G19/06; Y; Y10; Y10T; Y10T83/00; Y10T83/525; Y10T83/707; Y10T83/7226; Y10T83/727; Y10T83/732; Y10T83/869; Y10T83/872; Y10T83/95; Y10T83/96
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
158 words
A safety device for protecting an operator''s hands from the cutting edge of a blade disposed in a vertically oriented plate, comprising: A. a shield disposed in protective relation with a vertically disposed blade supported for linear motion along a vertical path paralleling the plane of the blade; and B. actuating means responsive to an engagement of a workpiece therewith for elevating the shield out of protective relation with the blade and further responsive to a disengagement of the workpiece for lowering said shield into protective relation with the blade, including, 1. a fluid driven actuator having an output shaft supported for cyclic rectilinear motion connected with the shield for imparting thereto rectilinear reciprocation, 2. means including a cylically operable fluid selector valve responsive to manipulation for imparting cyclic rectilinear motion to the shaft, and 3. feeler means mounted in juxtaposition with said shield for manipulating said valve in response to sequential engagement and disengagement with said workpiece.
Claim 2
Dependent Claim
158 words
A safety device for protecting an operator''s hands from the cutting edge of a blade disposed in a vertically oriented plate, comprising: A. a shield disposed in protective relation with a vertically disposed blade supported for linear motion along a vertical path paralleling the plane of the blade; and B. actuating means responsive to an engagement of a workpiece therewith for elevating the shield out of protective relation with the blade and further responsive to a disengagement of the workpiece for lowering said shield into protective relation with the blade, including, 1. a fluid driven actuator having an output shaft supported for cyclic rectilinear motion connected with the shield for imparting thereto rectilinear reciprocation, 2. means including a cylically operable fluid selector valve responsive to manipulation for imparting cyclic rectilinear motion to the shaft, and 3. feeler means mounted in juxtaposition with said shield for manipulating said valve in response to sequential engagement and disengagement with said workpiece.
Claim 3
Dependent Claim
91 words
A safety device for protecting an operator''s hands from the cutting edge of a blade disposed in a vertically oriented plate, comprising: A. a shield disposed in protective relation with a vertically disposed blade supported for linear motion along a vertical path paralleling the plane of the blade; and B. actuating means responsive to an engagement of a workpiece therewith for elevating the shield out of protective relation with the blade and further responsive to a disengagement of the workpiece for lowering said shield into protective relation with the blade, including,
Claim 4
Dependent Claim
91 words
A safety device for protecting an operator''s hands from the cutting edge of a blade disposed in a vertically oriented plate, comprising: A. a shield disposed in protective relation with a vertically disposed blade supported for linear motion along a vertical path paralleling the plane of the blade; and B. actuating means responsive to an engagement of a workpiece therewith for elevating the shield out of protective relation with the blade and further responsive to a disengagement of the workpiece for lowering said shield into protective relation with the blade, including,
Claim 5
Dependent Claim
22 words
a fluid driven actuator having an output shaft supported for cyclic rectilinear motion connected with the shield for imparting thereto rectilinear reciprocation,
Claim 6
Dependent Claim
22 words
a fluid driven actuator having an output shaft supported for cyclic rectilinear motion connected with the shield for imparting thereto rectilinear reciprocation,
Claim 7
Dependent Claim
20 words
means including a cylically operable fluid selector valve responsive to manipulation for imparting cyclic rectilinear motion to the shaft, and
Claim 8
Dependent Claim
20 words
means including a cylically operable fluid selector valve responsive to manipulation for imparting cyclic rectilinear motion to the shaft, and
Claim 9
Dependent Claim
35 words
The device of claim 1 wherein said actuating means includes means for limiting vertical motion imparted to said shield, as the shield is elevated, to a throw equal to the vertical thickness of said workpiece.
Claim 10
Dependent Claim
40 words
The device of claim 1 wherein said feeler means includes: A. a pivotal skid extended in a substantially horizontal direction forwardly of said blade; and B. means including an arm rigidly fixed to said skid for manipulating the selector valve.
Claim 11
Dependent Claim
22 words
feeler means mounted in juxtaposition with said shield for manipulating said valve in response to sequential engagement and disengagement with said workpiece.
Claim 12
Dependent Claim
22 words
feeler means mounted in juxtaposition with said shield for manipulating said valve in response to sequential engagement and disengagement with said workpiece.
Claim 13
Dependent Claim
50 words
The device of claim 3 wherein said fluid-driven actuator comprises a double-acting pneumatic cylinder including means defining a pressure port located at each of its opposite ends, and a flow reduction valve connected with each of the pressure ports for reducing the rate of rectilinear motion imparted to the shaft.
Claim 14
Dependent Claim
60 words
The device of claim 4 wherein said fluid selector valve comprises a three-position valve including a third position wherein said valve interrupts the flow of pneumatic fluid to either port of said double-acting pneumatic cylinder; a second position wherein pneumatic fluid is directed to a first port; and a first position wherein said fluid is directed to the other port.
Claim 15
Dependent Claim
113 words
A safety device for protecting an operator''s hands in combination with an endless blade of a band saw having a vertical run and driven in unidirectional displacement, said device comprising: A. an elongated shield partially circumscribing a segment of the run for said blade and supported for rectilinear motion along a path paralleling said segment; B. A cyclically operable, fluid-driven actuator having a linear output shaft for imparting rectilinear motion to said shield; and C. means including a feeler disposed in juxaposition with said shield and connected therewith for initiating operation of said actuator in response to an engagement therewith of a selected workpiece as the workpiece is moved relative to the blade.
Claim 16
Dependent Claim
113 words
A safety device for protecting an operator''s hands in combination with an endless blade of a band saw having a vertical run and driven in unidirectional displacement, said device comprising: A. an elongated shield partially circumscribing a segment of the run for said blade and supported for rectilinear motion along a path paralleling said segment; B. A cyclically operable, fluid-driven actuator having a linear output shaft for imparting rectilinear motion to said shield; and C. means including a feeler disposed in juxaposition with said shield and connected therewith for initiating operation of said actuator in response to an engagement therewith of a selected workpiece as the workpiece is moved relative to 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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |