Patent DE3210694A1 successfully refreshed from Google Patents.
US3809168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hammer drill
Assignee: Skil Corp
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Filing: 1973-04-23
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Granted: 1974-05-07
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Expires: 1993-04-23
Abstract
Abstract A driven shaft carries a ring gear having an annular formation of teeth adapted for ratcheting engagement with an annular series of fixed teeth. When the shaft is moved inwardly of the tool housing as the result of contact of the drill bit with the work, these teeth are brought into engagement to provide a hammering action. A spindle has one end thereof rotatably mounted in a bore formed in the shaft and has the other end thereof supporting a drill chuck. A coupler sleeve is axially slidable for being located in three predetermined positions; this coupler sleeve transfers rotation from the shaft to the spindle in two of its three axial positions thereby defining a drilling mode and a combined hammering and drilling mode. In the third axial position of the coupler sleeve, the same abuts a thrust formation and prevents engagement of the ratcheting teeth thereby to define a hammering mode of operation. The sleeve is axially positioned by manually operated cam means.
Inventors
- 👤 W Fromm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:56
CPC Classifications
B; B25; B25D; B25D11/00; B25D11/06; B25D11/10; B25D11/102; B25D11/106; B25D2211/00; B25D2211/06; B25D2211/062; B25D2211/067
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
372 words
In a power tool of the type adapted selectively to operate in a hammering mode, a drilling mode, and a combined hammering and drilling mode, which tool includes a first rotatably mounted member, a second member mounted for rotation with and relative to said first member, drive means connecting the motor of the tool to the second member for rotating the latter, connection means on said first member for connecting the latter to a working tool, hammering means including first and second hammering elements, said first hammering element being connected with said drive means for rotating in unison with said second member and relative to said second hammering element, means for engaging and disengaging said first and second hammering elements in response to axial movement of said first and second members, and a thrust formation on said first member for movement in unison therewith, the improvement comprising: a. a coupler sleeve slidable axially relative to said first and second members and connected to said first member for transmitting rotary movement thereto; b. first and second coupling formations on said coupler sleeve and said second member, respectively, said coupling formations being interengaged in first and second axial positions of said coupler sleeve for rotation of the coupler sleeve in response to rotation of the second member and thereby defining said drilling mode and said combined hammering and drilling mode, respectively, said coupling formations being disengaged when said coupler sleeve occupies a third axial position thereby defining said hammering mode; c. a fixed cam element; d. a rotary cam element engaged with said first cam element for being cammed in a direction axially of said coupler sleeve in response to rotation of the rotary cam element; and e. means connecting said rotary cam element with said coupler sleeve for rotation relative thereto and for axial movement in unison therewith whereby said rotary cam element serves to move said coupler sleeve to said first, second and third positions, said rotary cam element serving to locate said coupler sleeve in close adjacent relationship with said thrust formation when the former occupies said first position thereby to prevent axial movement of said first and second members and the consequent engagement of said first and second hammering elements.
Claim 2
Dependent Claim
372 words
In a power tool of the type adapted selectively to operate in a hammering mode, a drilling mode, and a combined hammering and drilling mode, which tool includes a first rotatably mounted member, a second member mounted for rotation with and relative to said first member, drive means connecting the motor of the tool to the second member for rotating the latter, connection means on said first member for connecting the latter to a working tool, hammering means including first and second hammering elements, said first hammering element being connected with said drive means for rotating in unison with said second member and relative to said second hammering element, means for engaging and disengaging said first and second hammering elements in response to axial movement of said first and second members, and a thrust formation on said first member for movement in unison therewith, the improvement comprising: a. a coupler sleeve slidable axially relative to said first and second members and connected to said first member for transmitting rotary movement thereto; b. first and second coupling formations on said coupler sleeve and said second member, respectively, said coupling formations being interengaged in first and second axial positions of said coupler sleeve for rotation of the coupler sleeve in response to rotation of the second member and thereby defining said drilling mode and said combined hammering and drilling mode, respectively, said coupling formations being disengaged when said coupler sleeve occupies a third axial position thereby defining said hammering mode; c. a fixed cam element; d. a rotary cam element engaged with said first cam element for being cammed in a direction axially of said coupler sleeve in response to rotation of the rotary cam element; and e. means connecting said rotary cam element with said coupler sleeve for rotation relative thereto and for axial movement in unison therewith whereby said rotary cam element serves to move said coupler sleeve to said first, second and third positions, said rotary cam element serving to locate said coupler sleeve in close adjacent relationship with said thrust formation when the former occupies said first position thereby to prevent axial movement of said first and second members and the consequent engagement of said first and second hammering elements.
Claim 3
Dependent Claim
40 words
The improvement according to claim 1 wherein said rotary cam element is in the form of a collar having at least a portion thereof accessible exteriorly of the power tool for being manually rotated relative to said fixed cam element.
Claim 4
Dependent Claim
43 words
The improvement according to claim 2 wherein said fixed cam element and said collar have respective interengaged cam formations, one of said formations being stepped whereby said collar is cammed to three predetermined axial positions thereby establishing said three positions of said sleeve.
Claim 5
Dependent Claim
61 words
The improvement according to claim 3 wherein said fixed cam element is annular in shape and wherein said fixed cam element and said collar have plural sets of said cam formations spaced circumferentially therearound whereby said collar may be successively and repeatedly located in its predetermined axial positions during a single revolution of said collar relative to said fixed cam element.
Claim 6
Dependent Claim
51 words
The improvement according to claim 1 further defined by: a. first key and keyway means connecting said coupler sleeve to said first member; and b. second key means defining one of said first and second coupler formations and second keyway means defining the other of said first and second coupler formations.
Claim 7
Dependent Claim
68 words
The improvement according to claim 1 further defined by: a. a stationary member; and b. first and second catch means on said stationary member and on said coupler sleeve, respectively, said first and second catch means being brought into engagement with each other when said coupler sleeve occupies said third axial position thereby to prevent rotation of said sleeve and said first rotary member in said hammering mode.
References Cited (Backward Citations)
US3000225A
Cited
US3433082A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |