US3630293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Closed lubrication system
Assignee: Black and Decker Corp
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Filing: 1970-10-02
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Granted: 1971-12-28
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Expires: 1990-10-02
Abstract
Abstract A portable electric device comprising a housing having an electric motor disposed therein. The motor includes a rotatable shaft carried by bearings supported upon the housing. The motor shaft rotates an output member which carries a rotatable tool bit. In addition, the motor shaft actuates a hammer mechanism adapted to deliver a series of longitudinal hammer blows to the rear end of the tool bit. The hammer mechanism is constructed in a novel manner to insure distribution of lubricating grease throughout.
Inventors
- 👤 Robert G Moores Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:39
CPC Classifications
B; B25; B25D; B25D17/00; B25D17/26; Y; Y10; Y10S; Y10S173/00; Y10S173/03
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
192 words
A rotary hammer comprising a housing having a drive motor therein, a tool bit supported upon said housing, a hammer mechanism adapted to deliver longitudinal hammer blows to said tool bit, transmission means interconnecting said drive motor and said hammer mechanism, said hammer mechanism including an elongated barrel fixed in said housing, a ram in said barrel and movable longitudinally thereof and axially of said bit, a coil spring closely disposed to the internal periphery of said barrel and normally biasing said ram toward engagement with said tool bit, said transmission means including rotatable means adapted to move said ram away from engagement with said tool bit, said coil spring normally tending to rotate with said rotatable means, a lubricating grease reservoir in communication with the interior of said barrel, whereby movement of said ram tends to displace grease in one direction longitudinally of said barrel, said spring rotating in a direction whereby to cooperate with the inner peripheral surface of said barrel and feed said grease axially thereof between said spring and said barrel in a direction opposite said one direction, whereby to continually redistribute said lubricating grease within said barrel.
Claim 2
Dependent Claim
192 words
A rotary hammer comprising a housing having a drive motor therein, a tool bit supported upon said housing, a hammer mechanism adapted to deliver longitudinal hammer blows to said tool bit, transmission means interconnecting said drive motor and said hammer mechanism, said hammer mechanism including an elongated barrel fixed in said housing, a ram in said barrel and movable longitudinally thereof and axially of said bit, a coil spring closely disposed to the internal periphery of said barrel and normally biasing said ram toward engagement with said tool bit, said transmission means including rotatable means adapted to move said ram away from engagement with said tool bit, said coil spring normally tending to rotate with said rotatable means, a lubricating grease reservoir in communication with the interior of said barrel, whereby movement of said ram tends to displace grease in one direction longitudinally of said barrel, said spring rotating in a direction whereby to cooperate with the inner peripheral surface of said barrel and feed said grease axially thereof between said spring and said barrel in a direction opposite said one direction, whereby to continually redistribute said lubricating grease within said barrel.
Claim 3
Dependent Claim
119 words
A portable rotary hammer comprising a housing having an electric motor disposed therein an elongated barrel fixed within said Housing and having a ram rotatably and reciprocably disposed therein, a coil spring in said barrel and normally biasing said ram in one direction longitudinally of said barrel, transmission means interconnecting said motor and said ram, whereby to rotate said ram and move it is another longitudinal direction opposite said one direction, said coil spring being rotatable with said ram, said rotating and reciprocating ram tending to move lubricating grease within said barrel in said one longitudinal direction and radially of said ram, said rotating spring tending to move said lubricating grease by threading action in said another longitudinal direction.
Claim 4
Dependent Claim
119 words
A portable rotary hammer comprising a housing having an electric motor disposed therein an elongated barrel fixed within said Housing and having a ram rotatably and reciprocably disposed therein, a coil spring in said barrel and normally biasing said ram in one direction longitudinally of said barrel, transmission means interconnecting said motor and said ram, whereby to rotate said ram and move it is another longitudinal direction opposite said one direction, said coil spring being rotatable with said ram, said rotating and reciprocating ram tending to move lubricating grease within said barrel in said one longitudinal direction and radially of said ram, said rotating spring tending to move said lubricating grease by threading action in said another longitudinal direction.
Claim 5
Dependent Claim
17 words
A device as defined in claim 1 wherein said ram includes a portion extending into said reservoir.
Claim 6
Dependent Claim
25 words
A device as defined in claim 1 wherein said ram rotates with said rotatable means, whereby to propel said grease radially outwardly against said barrel.
Claim 7
Dependent Claim
47 words
A device as defined in claim 1 wherein said spring surrounds a reduced diameter portion of said ram, said ram being keyed to said rotatable means to rotate therewith, said ram being aperture to displace grease radially outwardly thereof by centrifugal force during operation of said tool.
Claim 8
Dependent Claim
41 words
A device as defined in claim 2 wherein said spring is disposed in closely spaced relation to the interior surface of said barrel, whereby to cooperate therewith during operation of said tool to move said grease in said another longitudinal direction.
Claim 9
Dependent Claim
40 words
A device as defined in claim 2 wherein said ram includes reduced diameter front and rear portions, said front portion being adapted to hammer upon tool bit means supported upon said housing, said rear portion extending through said coil spring.
Claim 10
Dependent Claim
24 words
A device as defined in claim 7 which includes a grease reservoir in said barrel, said ram rear portion extending slidably into said reservoir.
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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |