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US3799275A Expired / Lapsed US ⏱️ 0.0 years remaining

Hammer-drill

Assignee: Robert Bosch GmbH
•
Filing: 1972-01-13
•
Granted: 1974-03-26
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Expires: 1992-01-13
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Abstract

Abstract A synthetic plastic housing of a hammer-drill has an output shaft for coupling with the drill bit, the output shaft being mounted in the housing for rotary and reciprocable displacement. A drive drives the output shaft in rotation and the inner end of the output shaft carries a disc which is normally in engagement with a juxtaposed but fixed disc, with the two discs having respectively engaging projections so configurated that when the disc on the output shaft rotates with the latter, it will alternately be urged away from and be allowed to move closer to the fixed disc so that the output shaft reciprocates axially. A cylindrical control element extends transversely of the axis of the output shaft in the region of the rear end thereof, having at least two surfaces which extend in parallelism with the axis of the cylindrical control member but are located at different distances from this axis. The control member is turnable so that, when the surface located closer to this axis is juxtaposed with the inner end of the output shaft, there is no contact with the latter, whereas when the surface which is farther from the axis of the control member is juxtaposed with the inner end of the output shaft it presses against the latter, urging the same and thereby the disc thereon away from and out of engagement with the fixed disc so that the output shaft will only rotate but not reciprocate.

Inventors

  • 👤 H Lederer
  • 👤 M Kirn
  • 👤 D Plattenhardt
  • 👤 R Hahner
  • 👤 G Kuhlmann

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-06 16:16
CPC Classifications
B; B25; B25D; B25D16/00; B25D16/006; B25D2211/00; B25D2211/06; B25D2211/062; B25D2211/064

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 244 words
A hammer-drill, comprising an at least predominantly synthetic plastic housing; a journal mount in said housing; an output shaft journalled in said mount for rotary and reciprocable displacement and having an inner end located in said housing; drive means in said housing and having a drive shaft journalled in said mount and operative for driving said output shaft in rotation; motion-imparting means for imparting reciprocatory motion to said output shaft, including a first disc-shaped component on said output shaft rotatable therewith, and a second disc-shaped component fixedly juxtaposed with said first component and normally engaged therewith, said components having cooperating projections which on rotation of said first component impart reciprocatory motion to said output shaft, said output shaft, motion-imparting means and second component all being mounted on said journal mount; and control means for controlling the engagement of said second component with said first component, including a substantially cylindrical member turnably journalled in said mount and having a longitudinAl axis extending transversely of the axis of rotation of said shaft and having at least one surface extending in parallelism with said longitudinal axis and being adapted to exert pressure upon said inner end of said output shaft in a sense displacing the latter axially so that said first component becomes disengaged from said second component, and turning means for turning said cylindrical member to and from a position in which said one surface is juxtaposed with and exerts such pressure upon said inner end.
Claim 2
Dependent Claim 244 words
A hammer-drill, comprising an at least predominantly synthetic plastic housing; a journal mount in said housing; an output shaft journalled in said mount for rotary and reciprocable displacement and having an inner end located in said housing; drive means in said housing and having a drive shaft journalled in said mount and operative for driving said output shaft in rotation; motion-imparting means for imparting reciprocatory motion to said output shaft, including a first disc-shaped component on said output shaft rotatable therewith, and a second disc-shaped component fixedly juxtaposed with said first component and normally engaged therewith, said components having cooperating projections which on rotation of said first component impart reciprocatory motion to said output shaft, said output shaft, motion-imparting means and second component all being mounted on said journal mount; and control means for controlling the engagement of said second component with said first component, including a substantially cylindrical member turnably journalled in said mount and having a longitudinAl axis extending transversely of the axis of rotation of said shaft and having at least one surface extending in parallelism with said longitudinal axis and being adapted to exert pressure upon said inner end of said output shaft in a sense displacing the latter axially so that said first component becomes disengaged from said second component, and turning means for turning said cylindrical member to and from a position in which said one surface is juxtaposed with and exerts such pressure upon said inner end.
Claim 3
Dependent Claim 62 words
A hammer-drill as defined in claim 1, said cylindrical member further having an additional surface also extending in parallelism with said longitudinal axis but spaced therefrom by a lesser distance than the first-mentioned surface so that, when said additional surface is juxtaposed with said inner end, it is spaced therefrom and said first and second components are in engagement with one another.
Claim 4
Dependent Claim 41 words
A hammer-drill as defined in claim 1, said housing having two interior compartments, one of which houses said drive means and the other of which houses at least said output shaft and components; said journal mount being mounted between said compartments.
Claim 5
Dependent Claim 29 words
A hammer-drill as defined in claim 1, said turning means including an electrically insulated handle operatively associated with said cylindrical member and accessible at the exterior of said housing.
Claim 6
Dependent Claim 23 words
A hammer-drill as defined in claim 4, said handle including indicia means providing a visual indication of the position of said cylindrical member.
Claim 7
Dependent Claim 15 words
A hammer-drill as defined in claim 1, said housing including two cooperating shell-shaped housing sections.

References Cited (Backward Citations)

CA684169A Cited
US3123156A Cited
US3171286A Cited
FR1457220A Cited
CH432338A Cited
US3693728A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-03-25 1977-09-24 1978-03-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-03-25 1981-09-24 1982-03-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-03-25 1985-09-24 1986-03-26 $7700.00 Window Closed / Lapsed

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