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.