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US3596033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switch dust guard for radial arm saw
Assignee: Black and Decker Corp
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Filing: 1969-08-27
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Granted: 1971-07-27
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Expires: 1989-08-27
Abstract
Abstract A radial arm saw including a base having an upstanding post supported thereon. An arm extends over a horizontal work table supported upon the base and has a carriage suspended therefrom for movement therealong. A motor-powered saw is fixed to the carriage and is adapted to cut workpieces on the table. The arm is adapted to be pivoted about a vertical axis and is vertically adjustable to vary the angle and depth of cut, respectively, on workpieces on the table. A control mechanism including a movable switchbox is electrically connected to the saw motor and carriage and is constructed to control operation of the saw and carriage. The switchbox has one or more pushbutton switches provided with novel means to prevent contamination thereof by dust, chips, and other foreign matter.
Inventors
- 👤 John L Wickham
- 👤 George W Cowman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:32
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/02; H01H13/04; H01H13/06; H01H13/08; H01H13/12; H01H13/14
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
186 words
In a radial arm saw of the type having a base, upstandingcolumn means supported upon said base, arm means extending from said column means and over a table supported by said base, and a saw carriage including an electric-motor-powered rotary saw supported for movement along said arm means; the improvement in said radial arm saw which comprises a portable control mechanism electrically connected to and adapted to control said electric motor, said control mechanism including housing means having at least one electric switch disposed internally thereof, a pushbutton slidably supported upon said housing means and having a first portion extending internally thereof and engageable with said switch, a second portion disposed externally of said housing means for operator access, resilient sealing means interposed between said pushbutton and said housing means and preventing passage of dust, chips, and other foreign matter around said pushbutton and into said housing means, said sealing means engaging outwardly tapered, radial shoulder means on said pushbutton, and means normally biasing said sealing means axially against said shoulder means, whereby said sealing means is held in tight sealing engagement with said housing means.
Claim 2
Dependent Claim
186 words
In a radial arm saw of the type having a base, upstandingcolumn means supported upon said base, arm means extending from said column means and over a table supported by said base, and a saw carriage including an electric-motor-powered rotary saw supported for movement along said arm means; the improvement in said radial arm saw which comprises a portable control mechanism electrically connected to and adapted to control said electric motor, said control mechanism including housing means having at least one electric switch disposed internally thereof, a pushbutton slidably supported upon said housing means and having a first portion extending internally thereof and engageable with said switch, a second portion disposed externally of said housing means for operator access, resilient sealing means interposed between said pushbutton and said housing means and preventing passage of dust, chips, and other foreign matter around said pushbutton and into said housing means, said sealing means engaging outwardly tapered, radial shoulder means on said pushbutton, and means normally biasing said sealing means axially against said shoulder means, whereby said sealing means is held in tight sealing engagement with said housing means.
Claim 3
Dependent Claim
35 words
The improvement of claim 1 which includes a plurality of pushbuttons slidably supported upon said housing means, each of said pushbuttons having one of said sealing means interposed between said pushbutton and said housing means.
Claim 4
Dependent Claim
36 words
The improvement of claim 1 wherein said biasing means includes a compression spring normally biasing said pushbutton in one direction, said sealing means being trapped axially between said spring and said shoulder means on said pushbutton.
Claim 5
Dependent Claim
29 words
The improvement of claim 3 wherein said sealing means includes an annular member constructed from a material selected from the class consisting of flexible rubber and plastics, and felt.
Claim 6
Dependent Claim
36 words
The improvement of claim 3 wherein said housing means has an annular bushing supported thereon, said pushbutton being slidable in said bushing, said sealing means being movable with said pushbutton and slidably engageable with said bushing.
Claim 7
Dependent Claim
21 words
The improvement of claim 5 wherein said spring is caged between a radial shoulder on said bushing and said sealing means.
Claim 8
Dependent Claim
113 words
A pushbutton switch comprising a housing, a switch fixed within said housing, means defining an opening in said housing adjacent said switch, a pushbutton slidably disposed in said opening for movement from a first to a second position and cooperable with means on said switch to actuate said switch, resilient sealing means snugly engaging said pushbutton and said opening to prevent passage of dust, chips, and other foreign matter past said pushbutton and into said housing, said sealing means engaging outwardly tapered, radial shoulder means on said pushbutton, and means normally biasing said sealing means axially against said shoulder means, whereby said sealing means is held in tight sealing engagement with said opening.
Claim 9
Dependent Claim
113 words
A pushbutton switch comprising a housing, a switch fixed within said housing, means defining an opening in said housing adjacent said switch, a pushbutton slidably disposed in said opening for movement from a first to a second position and cooperable with means on said switch to actuate said switch, resilient sealing means snugly engaging said pushbutton and said opening to prevent passage of dust, chips, and other foreign matter past said pushbutton and into said housing, said sealing means engaging outwardly tapered, radial shoulder means on said pushbutton, and means normally biasing said sealing means axially against said shoulder means, whereby said sealing means is held in tight sealing engagement with said opening.
Claim 10
Dependent Claim
25 words
A switch as defined in claim 7 wherein said opening defining means includes an annular bushing secured to said housing and slidably supporting said pushbutton.
Claim 11
Dependent Claim
56 words
A switch as defined in claim 7 wherein said sealing means includes a flexible annular member surrounding said pushbutton, said biasing means includes a compression spring normally biasing said pushbutton toward said first position and axially compressing said annular sealing member, whereby to maintain said sealing member in close engagement with said pushbutton and said opening.
Claim 12
Dependent Claim
26 words
A switch as defined in claim 9 wherein said spring and said sealing member are caged between said shoulder means on said pushbutton and said opening.
Claim 13
Dependent Claim
29 words
A switch as defined in claim 9 wherein said flexible annular member is constructed of a material selected from the group consisting of flexible rubber and plastics, and felt.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |