Power driven hammers or the like

Claim 2

A power driven device, comprising: a casing; a tool holder; means mounting said tool holder for rotation in said casing; a cyclically operable impact imparting mechanism for imparting axial impacts to said tool holder; means for reciprocating said impact imparting mechanism in said casing; and means so driveconnecting said impact imparting mechanism to said tool holder that, in each cycle of operation of said impact imparting mechanism, said mechanism rotatably advances said tool holder, said drive connecting means comprising rotatably mounted, axially aligned input and output means; first means so drive-connecting said impact imparting mechanism to said input means that said input means is rotatively oscillated as said impact imparting mechanism reciprocates; second means for so drive-connecting said input means to said output means that said output means is rotatively advanced by said input means as said input means moves in one of its directions of movement only; and third means connecting said tool holder to said output means for rotation therewith, all of the first means connecting the impact imparting mechanism to said input means and said input means being rectilinearly movable in said casing along the axis along which said input and output means are aligned.

Claim 3

The device of claim 1, wherein said impact imparting mechanism includes a rectilinearly reciprocable piston, said input means includes a rotatable drive member having a bore therein into which said piston extends, said input means being integral with said drive member, and said first means comprises external helical splines on said piston and internal helical splines in the bore of said drive member.

Claim 4

The device of claim 1, wherein the third means connecting said tool holder to said output means comprises external splines on one of these components and co-operating internal splines on the other of said components.

Claim 5

The device of claim 1, wherein said casing has an internal annular shoulder therein for retaining said tool holder in said casing, the device also including an annular shock absorbing member in said casing between said shoulder and the end of the tool holder facing said shoulder.

Claim 6

The device of claim 1, wherein said second drive-connecting means comprises co-operating drive elements on said input and output means and including means biasing said elements into driving engagement, said co-operating elements being configured to allow the elements on the input means to ride out of engagement with the elements on the output means despite the force exerted by said biasing means while a rotation restraining force of a predetermined magnitude is exerted on said output means.

Claim 7

The device of claim 1, together with means mounting said tool holder for rectilinear movement in the nose portion of said casing, said casing having means for retaining the tool holder therein and an opening in the nose end thereof through which a tool can be inserted for connection to said tool holder, said tool holder having a blind tool receiving bore therein with the closed end of the bore being the furthermost from the nose end of the casing, and there being a sealing member extending completely around and engaging the periphery of the tool holder and the inside of the casing, whereby foreign matter is prevented from penetrating beyond the work holder into the interior of the casing.

Claim 8

A power driven device according to claim 6, wherein the opening in the nose end of the casing has a non-circular configuration, whereby said casing will restrain against rotation a tool inserted therethrough which has a matching external configuration.

Claim 9

The device of claim 6, wherein the tool receiving bore in the tool holder has a non-circular configuration, whereby a tool inserted into said bore and having a matching external configuration is connected to said tool holder for rotation therewith.

Claim 10

A power driven device, comprising: a tool holder; a rectilinearly reciprocable impact imparting mechanism having a working stroke in which it axially impacts said tool holder and a return stroke, a rotatable driven member, said tool holder being fixed to said driven member for rotation therewith; a rotatable, unitary, axially movable driving member disposed between said driven member and said impact imparting mechanism, there being co-operating means on said impact imparting mechanism and said driving member for converting the rectilinear movement of said impact imparting mechanism during its working and return strokes into alternately oppositely directed rotary movements of said driving member and means on said driving member engageable with co-operating means on said driven member to rotatably advance said driven member and therefore said tool holder as said driving member is rotated in one of said opposite directions, said means being constructed to permit the driving member to rotate relative to the driven member as it rotates in the other of said opposite directions; and means biasing into engagement the co-operating means on said driving and driven members.

Claim 11

A power driven device, comprising: a tool holder; a rectilinearly reciprocable impact imparting mechanism having a working stroke in which it axially impacts said tool holder and a return stroke, a rotatable driven member, said tool holder being fixed to said driven member for rotation therewith; a rotatable, unitary, axially movable driving member disposed between said driven member and said impact imparting mechanism, there being co-operating means on said impact imparting mechanism and said driving member for converting the rectilinear movement of said impact imparting mechanism during its working and return strokes into alternately oppositely directed rotary movements of said driving member and means on said driving member engageable with co-operating means on said driven member to rotatably advance said driven member and therefore said tool holder as said driving member is rotated in one of said opposite directions, said means being constructed to permit the driving member to rotate relative to the driven member as it rotates in the other of said opposite directions; and means biasing into engagement the co-operating means on said driving and driven members.

Claim 12

The device of claim 9, wherein the rectilinearly reciprocable impact imparting mechanism includes a cylindrical piston having one closed end and an impact producing driver slidable in said piston and extending through the other end of the piston, said piston being so ported as to permit the formation of air cushions in the opposite ends of said piston as said driver moves back and forth therein.

Claim 13

The device of claim 10, together with drive means for reciprocating the piston of the impact imparting mechanism comprising a rotatably mounted crank having an eccentric crankpin thereon; a connecting rod pivotally fixed to said crankpin; and means pivotally fixing said connecting rod to said piston.

Claim 14

The device of claim 10, together with drive means for reciprocating the piston of the impact imparting mechanism comprising a rotatably mounted crank; an eccentrically mounted crankpin; a crosshead having a slot extending at right angles to the direction of reciprocation of said piston, said crankpin extending through said slot; guides confining said crosshead to rectilinear, reciprocal movement in the same direction as said piston; and means fixing said crosshead to said piston.

Claim 15

A power driven device, comprising: a casing having a nose portion; a tool holder rectilinearly movable in the nose portion of said casing; a rectilinearly reciprocable impact imparting mechanism having a working stroke in which it imparts an axial impact to said tool holder and a return stroke and including a piston and a driver mounted in said piston and engageable with said tool holder; drive means for reciprocating said piston; and a component mounted in and restrained against rotation relative to said casing, said piston being rectilinearly movable in said component and said component and said piston having co-operating means for restraining said piston against rotation relative to said component.

Claim 16

A power driven device, comprising: a casing having a nose portion; a tool holder rectilinearly movable in the nose portion of said casing; a rectilinearly reciprocable impact imparting mechanism having a working stroke in which it imparts an axial impact to said tool holder and a return stroke and including a piston and a driver mounted in said piston and engageable with said tool holder; drive means for reciprocating said piston; and a component mounted in and restrained against rotation relative to said casing, said piston being rectilinearly movable in said component and said component and said piston having co-operating means for restraining said piston against rotation relative to said component.

Claim 17

The device of claim 13, wherein said co-operating means comprise external splines on said piston and internal splines in the component in which said piston is rectilinearly movable.

Claim 18

A power driven device, comprising: a casing having a nose portion; a tool holder rectilinearly movable in the nose portion of said casing: a rectilinearly reciprocable impact imparting mechanism in said casing for producing axial impacts on said tool holder; a motor; and a motion transmitting and converting means drive-connecting the motor to the impact imparting mechanism, said last-mentioned means comprising a crank mounted with its axis of rotation at right angles to the axis of reciprocation of the impact imparting mechanism and means connecting said crank to said mechanism, said motor having a rotatable output shaft and bEing mounted with the axis of rotation of said shaft in parallel, spaced relationship to the axis of rotation of said crank and between said last-mentioned axis and the nose portion of said casing, and said motion transmitting and converting means further comprising means drive-connecting said motor output shaft to said crank.

Claim 19

A power driven device, comprising: a casing having a nose portion; a tool holder rectilinearly movable in the nose portion of said casing: a rectilinearly reciprocable impact imparting mechanism in said casing for producing axial impacts on said tool holder; a motor; and a motion transmitting and converting means drive-connecting the motor to the impact imparting mechanism, said last-mentioned means comprising a crank mounted with its axis of rotation at right angles to the axis of reciprocation of the impact imparting mechanism and means connecting said crank to said mechanism, said motor having a rotatable output shaft and bEing mounted with the axis of rotation of said shaft in parallel, spaced relationship to the axis of rotation of said crank and between said last-mentioned axis and the nose portion of said casing, and said motion transmitting and converting means further comprising means drive-connecting said motor output shaft to said crank.

Claim 20

The device of claim 15, wherein the means connecting said crank to the impact imparting mechanism comprises an eccentrically mounted crankpin on said crank, a connecting rod pivotally fixed to said crank, and a wrist pin pivotally fixing said connecting rod to said impact imparting mechanism.

Claim 21

The device of claim 15, wherein the means drive-connecting the motor output shaft to said crank is gear teeth on said shaft and gear teeth around the periphery of said crank intermeshing with those on the motor output shaft.

Claim 22

A power driven device, comprising: a rectilinearly reciprocable impact imparting mechanism; a motor; motion transmitting and converting means drive-connecting said motor to said impact imparting mechanism; a rotatably mounted tool holder; and means so drive-connecting said impact imparting mechanism to said tool holder that rectilinear movement of said mechanism produces rotary movement of the tool holder, said last-mentioned means including a torque responsive clutch for effectively interrupting the drive connection between the impact imparting mechanism and the tool holder while rotation resisting forces of at least a predetermined magnitude are exerted on said tool holder which comprises a rotatable, axially fixed output member connected to said tool holder for rotation therewith, a rotatable, axially movable input means, and cooperating first and second means on said input means and output member, respectively, for providing a drive connection therebetween, said co-operating means being so configured as to permit those on the input means to override those on the output member when said rotation restraining force of predetermined magnitude is reached to thereby permit said input means to rotate relative to said output member, and the means for drive-connecting the impact imparting mechanism to the tool holder also including an axially movable, rotary drive means which is integral with said rotatable input means and rotatable by said impact imparting mechanism as the latter reciprocates and means biasing said rotary drive means and said clutch input means toward said clutch output member to engage the drive connection providing means on the input means with the co-operating drive connection providing means on the output member so that the drive connection providing means on the input means will override the co-operating means on the output member only upon the rotation resisting force reaching said predetermined magnitude and overcoming the clutch engaging force exerted by said biasing means.

Claim 23

A power driven device, comprising: a rectilinearly reciprocable impact imparting mechanism; a motor; motion transmitting and converting means drive-connecting said motor to said impact imparting mechanism; a rotatably mounted tool holder; and means so drive-connecting said impact imparting mechanism to said tool holder that rectilinear movement of said mechanism produces rotary movement of the tool holder, said last-mentioned means including a torque responsive clutch for effectively interrupting the drive connection between the impact imparting mechanism and the tool holder while rotation resisting forces of at least a predetermined magnitude are exerted on said tool holder which comprises a rotatable, axially fixed output member connected to said tool holder for rotation therewith, a rotatable, axially movable input means, and cooperating first and second means on said input means and output member, respectively, for providing a drive connection therebetween, said co-operating means being so configured as to permit those on the input means to override those on the output member when said rotation restraining force of predetermined magnitude is reached to thereby permit said input means to rotate relative to said output member, and the means for drive-connecting the impact imparting mechanism to the tool holder also including an axially movable, rotary drive means which is integral with said rotatable input means and rotatable by said impact imparting mechanism as the latter reciprocates and means biasing said rotary drive means and said clutch input means toward said clutch output member to engage the drive connection providing means on the input means with the co-operating drive connection providing means on the output member so that the drive connection providing means on the input means will override the co-operating means on the output member only upon the rotation resisting force reaching said predetermined magnitude and overcoming the clutch engaging force exerted by said biasing means.

Claim 24

A power driven device, comprising: a tool holder; a rectilinearly reciprocable impact imparting mechanism having a working stroke in which it axially impacts said tool holder and a return stroke; a rotatable driven member, said tool holder being fixed to said driven member for rotation therewith; a rotatable, axially movable, unitary driving member disposed between said driven member and said impact imparting mechanism, there being co-operating means on said impact imparting mechanism and said driving member for converting the rectilinear movement of said impact imparting mechanism during its working and return strokes into alternately oppositely directed rotary movements of said driving member and means on said driving member engageable with co-operating means on said driven member to rotatably advance said driven member and therefore said tool holder as said driving member is rotated in one of said opposite directions, said means being constructed to permit the driving member to rotate relative to the driven member as it rotates in the other of said opposite directions; means biasing into engagement the co-operating means on said Driving and driven members; and means fixing said driven member against axial movement, there being an annular flange on said driving member and said biasing means comprising a compression spring surrounding said driving member, one end of said spring bearing against said flange and the other end of said spring being axially fixed.

Claim 25

A power driven device, comprising: a tool holder; a rectilinearly reciprocable impact imparting mechanism having a working stroke in which it axially impacts said tool holder and a return stroke; a rotatable driven member, said tool holder being fixed to said driven member for rotation therewith; a rotatable, axially movable, unitary driving member disposed between said driven member and said impact imparting mechanism, there being co-operating means on said impact imparting mechanism and said driving member for converting the rectilinear movement of said impact imparting mechanism during its working and return strokes into alternately oppositely directed rotary movements of said driving member and means on said driving member engageable with co-operating means on said driven member to rotatably advance said driven member and therefore said tool holder as said driving member is rotated in one of said opposite directions, said means being constructed to permit the driving member to rotate relative to the driven member as it rotates in the other of said opposite directions; means biasing into engagement the co-operating means on said Driving and driven members; and means fixing said driven member against axial movement, there being an annular flange on said driving member and said biasing means comprising a compression spring surrounding said driving member, one end of said spring bearing against said flange and the other end of said spring being axially fixed.

Claim 26

A power driven device, comprising: a casing having a nose portion; a tool holder; means mounting said tool holder for rectilinear and rotary movement in the nose portion of said casing; a rectilinearly reciprocable impact imparting mechanism having a working stroke in which an axial impact is produced on said tool holder and a return stroke and including a cylindrical piston having one closed end and a driver slidable in said piston and extending through the other end of the piston, said driver being engageable with said tool holder and said piston being so ported as to permit the formation of air cushions in the opposite ends of said piston as said driver moves back and forth therein; drive means for reciprocating said piston which comprises a wobble plate, means mounting said wobble plate for pivotal movement about a pivot axis extending at right angles to the direction of movement of the piston of the impact imparting mechanism, means pivotally fixing said wobble plate to said piston, a cam engageable with said wobble plate for pivoting said plate about its pivot axis, and means mounting said cam for rotation about an axis disposed at right angles to said pivot axis; and means having rotatably mounted input element and output elements drive-connected between said piston and said tool holder for converting the rectilinear movement of said piston into intermittent rotary motion of said tool holder and for permitting said input member to slip relative to said output member while rotation restraining forces of at least a predetermined magnitude are exerted on said tool holder.

Claim 27

A power driven device, comprising: a casing having a nose portion; a tool holder; means mounting said tool holder for rectilinear and rotary movement in the nose portion of said casing; a rectilinearly reciprocable impact imparting mechanism having a working stroke in which an axial impact is produced on said tool holder and a return stroke and including a cylindrical piston having one closed end and a driver slidable in said piston and extending through the other end of the piston, said driver being engageable with said tool holder and said piston being so ported as to permit the formation of air cushions in the opposite ends of said piston as said driver moves back and forth therein; drive means for reciprocating said piston which comprises a wobble plate, means mounting said wobble plate for pivotal movement about a pivot axis extending at right angles to the direction of movement of the piston of the impact imparting mechanism, means pivotally fixing said wobble plate to said piston, a cam engageable with said wobble plate for pivoting said plate about its pivot axis, and means mounting said cam for rotation about an axis disposed at right angles to said pivot axis; and means having rotatably mounted input element and output elements drive-connected between said piston and said tool holder for converting the rectilinear movement of said piston into intermittent rotary motion of said tool holder and for permitting said input member to slip relative to said output member while rotation restraining forces of at least a predetermined magnitude are exerted on said tool holder.

Claim 28

A power driven device, comprising: an impact imparting mechanism, means mounting said impact imparting mechanism for reciprocable rectilinear movement; a motor; motion transmitting and converting means drive-connecting said motor to said impact imparting mechanism for cycling said mechanism through oppositely directed working and return strokes; a rotatably mounted tool holder; and means so drive-connecting said impact imparting mechanism to said tool holder that, during one of the strokes in each cycle thereof, said mechanism rotatably advances said tool holder, said mechanism not effecting rotation of the tool holder in the other stroke of each cycle thereof, the means drive-connecting the impact imparting mechanism to the tool holder comprising ratchet means including axially aligned, rotatable input and output members, means connecting said output member to said tool holder for rotation therewith, and means rotating said input member back and forth as said impact imparting mechanism moves in opposite directions, there being co-operating first and second means on said input and output members, respectively, which are engageable when said input member is rotated in one direction only to rotatably advance said output member and said tool holder and the means for rotating the input member back and forth including one means incorporated in the rotatable input member and a co-operating means incorporated in the impact imparting mechanism, said rotatable input member, said co-operating first means on said input member and said one means incorporated in the rotatable input member comprising a one piece, integral member.

Claim 29

A power driven device, comprising: an impact imparting mechanism, means mounting said impact imparting mechanism for reciprocable rectilinear movement; a motor; motion transmitting and converting means drive-connecting said motor to said impact imparting mechanism for cycling said mechanism through oppositely directed working and return strokes; a rotatably mounted tool holder; and means so drive-connecting said impact imparting mechanism to said tool holder that, during one of the strokes in each cycle thereof, said mechanism rotatably advances said tool holder, said mechanism not effecting rotation of the tool holder in the other stroke of each cycle thereof, the means drive-connecting the impact imparting mechanism to the tool holder comprising ratchet means including axially aligned, rotatable input and output members, means connecting said output member to said tool holder for rotation therewith, and means rotating said input member back and forth as said impact imparting mechanism moves in opposite directions, there being co-operating first and second means on said input and output members, respectively, which are engageable when said input member is rotated in one direction only to rotatably advance said output member and said tool holder and the means for rotating the input member back and forth including one means incorporated in the rotatable input member and a co-operating means incorporated in the impact imparting mechanism, said rotatable input member, said co-operating first means on said input member and said one means incorporated in the rotatable input member comprising a one piece, integral member.