Patent US3774699A successfully refreshed from Google Patents.
US3774699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hammer drill with slidable rotation gear and lock
Assignee: Hilti AG
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Filing: 1972-07-21
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Granted: 1973-11-27
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Expires: 1992-07-21
Abstract
Abstract An electric hammer drill is constructed to provide both striking and rotating motions for a tool mounted in the drill. Further, the rotational motion is provided by a gear wheel which, in turn, is driven by a pinion. If only striking motion is to be transmitted to the tool, the gear wheel can be disengaged from the pinion and, if required, the gear wheel in its disengaged position can be locked against rotational movement. The gear wheel is normally biased into engagement with the pinion. An operating lever is positioned on the hammer drill for selecting the desired arrangement of the gear wheel.
Inventors
- 👤 P Schmuck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:35
CPC Classifications
B; B25; B25D; B25D16/00; B25D16/006; B25D2211/00; B25D2211/003; B25D2216/00; B25D2216/0007; B25D2216/0015; B25D2216/0023; B25D2216/0046
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
146 words
Electric hammer drill for imparting rotating and striking motion to a tool positioned in the drill comprises a casing, a cylinder positioned within the casing and extending in the axial direction of the rotating and striking motion, piston means within said cylinder for imparting the striking motion to the tool, a gear wheel disposed concentrically of and fitted on said cylinder, a pinion arranged to be disposed in meshed engagement with said gear wheel for rotating said gear wheel, drive means operatively associated with said piston means and said pinion for transmitting the striking and rotating motion thereto, wherein the improvement comprises that said gear wheel is slidably mounted on said cylinder for movement in the axial direction thereof, first means for biasing said gear wheel into meshed engagement with said pinion and second means for displacing said gear wheel from meshed engagement with said pinion.
Claim 2
Dependent Claim
146 words
Electric hammer drill for imparting rotating and striking motion to a tool positioned in the drill comprises a casing, a cylinder positioned within the casing and extending in the axial direction of the rotating and striking motion, piston means within said cylinder for imparting the striking motion to the tool, a gear wheel disposed concentrically of and fitted on said cylinder, a pinion arranged to be disposed in meshed engagement with said gear wheel for rotating said gear wheel, drive means operatively associated with said piston means and said pinion for transmitting the striking and rotating motion thereto, wherein the improvement comprises that said gear wheel is slidably mounted on said cylinder for movement in the axial direction thereof, first means for biasing said gear wheel into meshed engagement with said pinion and second means for displacing said gear wheel from meshed engagement with said pinion.
Claim 3
Dependent Claim
49 words
Hammer drill, as set forth in claim 1, wherein said first means comprises an axially extending spring located within said casing encircling said cylinder, said spring disposed in contact with said gear wheel on the side thereof spaced from said pinion for biasing said gear wheel toward said pinion.
Claim 4
Dependent Claim
66 words
Electric drill hammer, as set forth in claim 2, wherein said second means for displacing said gear wheel from meshed engagement includes a slide member located within said casing and displaceable in the axial direction of the rotating and striking motion for displacing said gear wheel from engagement with said pinion, and said slide located on the opposite side of said gear wheel from said spring.
Claim 5
Dependent Claim
51 words
Electric hammer drill, as set forth in claim 3, wherein said second means for displacing said gear wheel from meshed engagement includes a locking element displaceable in the same direction as said slide for locking said gear wheel against rotational movement when it is displaced from meshed engagement with said pinion.
Claim 6
Dependent Claim
42 words
Electric hammer drill, as set forth in claim 4, wherein said locking element has teeth thereon in the end directed toward said gear wheel and said teeth are arranged to engage the teeth in said gear wheel for preventing it from rotating.
Claim 7
Dependent Claim
46 words
Electric hammer drill, as set forth in claim 5, wherein an operating lever is pivotally mounted on said casing and is in operative engagement with said slide and locking element for selectively positioning them in accordance with the desired movement to be imparted to the tool.
Claim 8
Dependent Claim
69 words
Electric drill hammer, as set forth in claim 6, wherein each of said slide member and locking element has a slot extending obliquely of the axial direction of said cylinder and of one another, and a cam eccentrically arranged on said operating lever and extending through each of said slots for axially displacing said slide member and said locking eLement as said operating lever is pivoted on said casing.
Claim 9
Dependent Claim
33 words
Electric hammer drill, as set forth in claim 7, wherein said locking element is superposed on said slide member and said slide member and locking element are axially displaceable relative to one another.
Claim 10
Dependent Claim
47 words
Electric drill hammer, as set forth in claim 8, wherein a key is arranged for securing said gear wheel to said cylinder for preventing rotational movement of said gear wheel relative to said cylinder and for affording axial movement of said gear wheel relative to said cylinder.
Claim 11
Dependent Claim
43 words
Electric hammer drill, as set forth in claim 9, wherein a ring is slidably mounted on said cylinder between said gear wheel and said slide member for transmitting the axial movement of said slide member toward said gear wheel to said gear wheel.
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |