Hammer drill

Claim 2

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, tHe improvement comprising: a. a first rotatably mounted member; b. a second member mounted for rotation with and relative to said first member; c. drive means connecting the motor of the tool to said second member for rotating the latter; d. connection means on said first member for connecting the latter to a working tool; e. coupling means for selectively coupling and uncoupling said first and second members to and from each other; f. hammering means independent of said coupling means and including first and second elements, said first element being connected with said drive means for rotating in unison with said second member and relative to said second element; g. other means for selectively engaging and disengaging said first and second hammering elements; h. whereby simultaneous hammering and drilling are achieved when said first and second elements are coupled and when said first and second elements are engaged, drilling only is achieved when said first and second members are coupled and first and second elements are disengaged, and hammering only is achieved when said first and second members are uncoupled and first and second elements are engaged.

Claim 3

The improvement according to claim 1 wherein said coupling means forms a part of said other means.

Claim 4

said external surface area and two of said formations in a second position of said coupling sleeve;

Claim 5

said external surface area and two of said formations in a second position of said coupling sleeve;

Claim 6

The improvement according to claim 1 further defined by: a. said second member being constituted by a shaft; b. bearing means mounting said shaft for limited axial movement; c. biasing means urging said shaft outwardly of the housing of said power tool; d. said shaft including an axial bore, said first member being constituted by a spindle with a portion of the latter rotatably received in said bore, the engagement between said spindle and said shaft permitting the transmission of axial forces from the former to the latter; and e. said first and second hammering elements being in confronting relation such that they are brought into engagement with each other in response to axial movement of said shaft inwardly of said housing.

Claim 7

and said external surface area and one of said two formations in a third position of said coupling sleeve; and l. said abutment surfaces being brought into aButting engagement with each other when said coupling sleeve is in said third position thereby to prevent engagement of said first and second hammering elements.

Claim 8

and said external surface area and one of said two formations in a third position of said coupling sleeve; and l. said abutment surfaces being brought into aButting engagement with each other when said coupling sleeve is in said third position thereby to prevent engagement of said first and second hammering elements.

Claim 9

The improvement according to claim 1 further defined by: a. said second member being constituted by a shaft having a first formation at one end thereof and an axial bore opening at said one end; b. said first member being constituted by a spindle having a cylindrical portion rotatably received within said bore and having another portion defined by a second formation; and c. said coupling means including a sleeve mounted for movement axially of said spindle relative thereto and having a third formation engaged with only one of said first and second formations in one position of the sleeve and engaged with both of said first and second formations in another position of the sleeve.

Claim 10

The improvement according to claim 4 further defined by: a. bearing means mounting said shaft for limited axial movement; b. said other means including biasing means urging said shaft outwardly of the housing of said power tool; c. said shaft including an axial bore, said spindle having a portion thereof rotatably received in said bore, the engagement between said spindle and said shaft permitting the transmission of axial forces from the former to the latter; and d. said first and second hammering elements being in confronting relation such that they are brought into engagement with each other in response to axial movement of said shaft inwardly of said housing.

Claim 11

The improvement according to claim 1 further defined by: a. said second member being constituted by a shaft having an external polygonal formation at one end thereof and an axial bore opening at said one end; b. said first member being constituted by a spindle having a cylindrical portion rotatably received within said bore and having another portion defined by an external polygonal formation; and c. said coupling means including a sleeve mounted for movement axially of said spindle relative thereto and having an internal polygonal surface engaged with only one of said external formations in one position of the sleeve and engaged with both of said external formations in another position of the sleeve.

Claim 12

The improvement according to claim 6 further defined by, a locking collar mounted for axial movement with said sleeve and for rotation relative thereto, said collar having an opening defined at least in part by a plurality of flat surfaces corresponding in number to the number of surfaces of the other of said external formations and arranged such that said opening will receive said last-mentioned formation to permit axial movement of said sleeve only when said collar is rotated relative to said sleeve for positioning said flat surfaces of the former in respective parallel relation with said surfaces of said other external formation.

Claim 13

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, the improvement comprising: a. a spindle mounted for rotation and for limited axial movement; b. a shaft mounted for limited axial movement and for rotation with and relative to said spindle, said shaft and said spindle being engaged with each other for the transmission of axial forces; c. drive means connecting the motor of the tool to said shaft for rotating the latter; d. connection means on said spindle for connecting the latter to a working tool; e. hammering means including first and second elements, said first element being connected with said shaft for rotating therewith and relative to said second element, said first and second elements being normally disengaged and being brought into engagement with each other in response to axial movement of said shaft inwardly of the housing of the power tool; f. a first abutment surface; g. coupling means having a second abutment surface, said coupling means beng independent of said hammering means; and h. means mounting said coupling means for axial movement relative to said spindle and for locating the former in any one of three positions, said coupling means engaging said shaft and said spindle and thereby coupling the same together for rotation in unison only when said coupling means occupies the first and second of its three positions, said first and second abutment surfaces being positioned for being brought into abutting engagement when said coupling means occupies said first position thereby to prevent axial movement of said shaft and the engagement of said first and second hammering elements.

Claim 14

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, the improvement comprising: a. a spindle mounted for rotation and for limited axial movement; b. a shaft mounted for limited axial movement and for rotation with and relative to said spindle, said shaft and said spindle being engaged with each other for the transmission of axial forces; c. drive means connecting the motor of the tool to said shaft for rotating the latter; d. connection means on said spindle for connecting the latter to a working tool; e. hammering means including first and second elements, said first element being connected with said shaft for rotating therewith and relative to said second element, said first and second elements being normally disengaged and being brought into engagement with each other in response to axial movement of said shaft inwardly of the housing of the power tool; f. a first abutment surface; g. coupling means having a second abutment surface, said coupling means beng independent of said hammering means; and h. means mounting said coupling means for axial movement relative to said spindle and for locating the former in any one of three positions, said coupling means engaging said shaft and said spindle and thereby coupling the same together for rotation in unison only when said coupling means occupies the first and second of its three positions, said first and second abutment surfaces being positioned for being brought into abutting engagement when said coupling means occupies said first position thereby to prevent axial movement of said shaft and the engagement of said first and second hammering elements.

Claim 15

The improvement according to claim 8 further defined by, said shaft and said spindle each having an external formation, said coupling means including a sleeve having an internal formation which engages both of said external formations when said coupling sleeve is located in said first and second positions and which engages only one of said external formations when said coupling sleeve is located in the third of its positions.

Claim 16

The improvement according to claim 9 further defined by, a locking collar mounted for movement with said coupling sleeve and for rotation relative thereto back and forth between first and second positions, said collar having an opening configured such that when said collar is in said first position the same engages one of said external formations thereby to prevent axial movement of said coupling sleeve relative to said spindle and such that when said collar is in said second position the opening therein receives said one external formation thereby to permit axial movement of said coupling sleeve relative to said spindle.

Claim 17

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, the improvement comprising: a. a spindle mounted for rotation and for limited axial movement and having an external surface formation; b. a shaft mounted for limited axial movement and for rotation with and relative to saId spindle, which shaft has an external surface formation, said shaft and said spindle being engaged with each other for the transmission of axial forces; c. drive means connecting the motor of the tool to said shaft for rotating the latter; d. connection means on said spindle for connecting the latter to a working tool; e. hammering means including first and second elements, said first element being connected with said shaft for rotation therewith and relative to said second element; f. biasing means urging said first and second hammering element apart and allowing said elements to be brought into engagement with each other in response to axial movement of said spindle inwardly of the housing of said power tool; g. a first abutment surface; h. a coupling sleeve having a second abutment surface and an internal surface formation; i. a collar mounted for movement with said coupling sleeve and for rotation relative thereto so as to establish three axial positions of said coupling sleeve; j. said internal surface formation of said coupling sleeve engaging only one of said external formations in one of said axial positions and both of said external formations in the other two of said axial positions; k. said first and second abutment surfaces being positioned for being brought into abutting engagement with each other when said coupling sleeve is in one of said two axial positions thereby to prevent engagement of said first and second hammering elements.

Claim 18

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, the improvement comprising: a. a spindle mounted for rotation and for limited axial movement and having an external surface formation; b. a shaft mounted for limited axial movement and for rotation with and relative to saId spindle, which shaft has an external surface formation, said shaft and said spindle being engaged with each other for the transmission of axial forces; c. drive means connecting the motor of the tool to said shaft for rotating the latter; d. connection means on said spindle for connecting the latter to a working tool; e. hammering means including first and second elements, said first element being connected with said shaft for rotation therewith and relative to said second element; f. biasing means urging said first and second hammering element apart and allowing said elements to be brought into engagement with each other in response to axial movement of said spindle inwardly of the housing of said power tool; g. a first abutment surface; h. a coupling sleeve having a second abutment surface and an internal surface formation; i. a collar mounted for movement with said coupling sleeve and for rotation relative thereto so as to establish three axial positions of said coupling sleeve; j. said internal surface formation of said coupling sleeve engaging only one of said external formations in one of said axial positions and both of said external formations in the other two of said axial positions; k. said first and second abutment surfaces being positioned for being brought into abutting engagement with each other when said coupling sleeve is in one of said two axial positions thereby to prevent engagement of said first and second hammering elements.

Claim 19

The improvement according to claim 11 wherein said first and second hammering elements include respective sets of ratcheting teeth.

Claim 20

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, the improvement comprising: a. a spindle mounted for rotation and for limited axial movement and having an external polygonal surface area; b. a shaft mounted for limited axial movement and for rotation with and relative to said spindle, which shaft has an external polygonal surface area, said shaft and said spindle being engaged with each other for the transmission of axial forces; c. drive means connecting the motor of the tool to said shaft for rotating the latter; d. connection means on said spindle for connecting the latter to a working tool; e. hammering means including first and second elements, said first element being connected with said shaft for rotation therewith and relative to said second element; f. biasing means urging said first and second hammering elements apart and allowing said elements to be brought into engagement with each other in response to axial movement of said spindle inwardly of the housing of said power tool; g. a fixed abutment surface; h. a coupling sleeve having an abutment surface and an internal polygonal surface area; i. one of said external surface areas being constituted by three axially spaced-apart formations defining two annular spaces therebetween; j. a locking collar mounted for movement with said coupling sleeve and for rotation relative thereto back and forth between first and second positions, said locking collar having an end wall with an opening therein configured such that the same receives said formations thereby to permit axial movement of said coupling sleeve when said collar is in said first position and such that said wall is received within one or the other of said annular spaces when said collar is in said second position thereby to prevent axial movement of said coupling sleeve; k. said internal surface area engaging:

Claim 21

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, the improvement comprising: a. a spindle mounted for rotation and for limited axial movement and having an external polygonal surface area; b. a shaft mounted for limited axial movement and for rotation with and relative to said spindle, which shaft has an external polygonal surface area, said shaft and said spindle being engaged with each other for the transmission of axial forces; c. drive means connecting the motor of the tool to said shaft for rotating the latter; d. connection means on said spindle for connecting the latter to a working tool; e. hammering means including first and second elements, said first element being connected with said shaft for rotation therewith and relative to said second element; f. biasing means urging said first and second hammering elements apart and allowing said elements to be brought into engagement with each other in response to axial movement of said spindle inwardly of the housing of said power tool; g. a fixed abutment surface; h. a coupling sleeve having an abutment surface and an internal polygonal surface area; i. one of said external surface areas being constituted by three axially spaced-apart formations defining two annular spaces therebetween; j. a locking collar mounted for movement with said coupling sleeve and for rotation relative thereto back and forth between first and second positions, said locking collar having an end wall with an opening therein configured such that the same receives said formations thereby to permit axial movement of said coupling sleeve when said collar is in said first position and such that said wall is received within one or the other of said annular spaces when said collar is in said second position thereby to prevent axial movement of said coupling sleeve; k. said internal surface area engaging:

Claim 22

The improvement according to claim 13 wherein said first and second hammering elements include respective sets of ratcheting teeth.