Hand-held machine tool

A hand-held machine tool for a workpiece comprising:

• a casing having first and second hollows therein,
• an electric motor enclosed in said first hollow and having a driving shaft,
• a driving mechanism accommodated in said second hollow and being drivingly connected to said driving shaft,
• said driving mechanism including a driven shaft and means for rotating and oscillating said driven shaft,
• a tool holder on said driven shaft for holding a tool having a working surface adapted for sanding, rasping and or filing a workpiece,
• a handle fixedly connected to said casing and including electric power conducting means and a switch for energizing and deenergizing said electric motor, and
• a guiding and supporting means having mounting means for being attached to said casing,
• said means for rotating said driven shaft comprising gear transmission means and said means for oscillating comprising a driving disk and a follower member and wherein interengaging means are provided such that when the disk rotates, the follower member reciprocates,
• said interengaging means comprises a rotatable disk having an eccentric groove therein and said follower member having a pin engaging said groove and being rotatably fixed to said driven shaft such that when said disk rotates, said follower member reciprocates and carries along said driven shaft.

A hand-held machine tool for a workpiece comprising:

• a casing having first and second hollows therein,
• an electric motor enclosed in said first hollow and having a driving shaft,
• a driving mechanism accommodated in said second hollow and being drivingly connected to said driving shaft,
• said driving mechanism including a driven shaft and means for rotating and oscillating said driven shaft,
• a tool holder on said driven shaft for holding a tool having a working surface adapted for sanding, rasping and or filing a workpiece,
• a handle fixedly connected to said casing and including electric power conducting means and a switch for energizing and deenergizing said electric motor, and
• a guiding and supporting means having mounting means for being attached to said casing,
• said means for rotating said driven shaft comprising gear transmission means and said means for oscillating comprising a driving disk and a follower member and wherein interengaging means are provided such that when the disk rotates, the follower member reciprocates,
• said casing having two shell halves, at least one thereof comprising partition wall means including a first partition wall adjacent to said first hollow, and second and third partition walls arranged transversely to said first partition wall,
• said first partition wall having a first opening for accommodating a first bearing for said driving shaft and a second opening for accommodating a second bearing for an intermediate shaft, a driving gear of said gear transmission being fixed to said driving shaft and carrying said rotating disk, intermediate gears of said gear transmission being provided to drive said intermediate shaft which has an end carrying a first bevel gear, said driving gear and said intermediate gears meshing with one another, said second partition wall having a third opening for accommodating a third bearing,
• an intermediate hollow shaft having two ends, one thereof being journalled and supported by said third bearing and the other end thereof carrying a second bevel gear, said first and second bevel gears meshing with one another,
• said intermediate hollow shaft and said driven shaft also comprising rotational coupling means which allow axial reciprocating movement to said driven shaft within said hollow shaft.

A portable power tool comprising

• a housing,
• a motor in said housing and having a motor shaft,
• a handle on said housing and including control means for said motor,
• a driving mechanism in said housing and including an output shaft having a shaft axis,
• a generally cylindrical tool for sanding, rasping or filing a workpiece and having an end attachable to said output shaft,
• means for guiding and supporting said power tool on a workpiece surface defining a guiding direction and having a base plate with a recess through which said cylindrical tool extends,
• said driving mechanism being connected to said motor shaft so as to rotate said output shaft, and including means for oscillating said output shaft,
• said guiding and supporting means also including
• tubing means which extends parallel to said guiding direction near said attachable end of said tool and forms a pivotal seat,
• sleeve means which are fixed to said base plate and encompass said pivotal seat so as to allow pivotal movement of said sleeve means and said base plate about said guiding direction to select any pivotal position in a predetermined range from a neutral position of the base plate, and
• clamping means which are adapted to fix said sleeve means relative to said seat in any selected pivotal position of said sleeve and said base plate,
• said tubing means being also adapted to be connected to a vacuum source so as to suck any dust and debris from near said attachable tool end.

A hand-held machine tool comprising:

• a casing (1) having first and second hollows (4,5) therein,
• an electric motor (20) enclosed in said first hollow (4) and having a driving shaft (41),
• a handle (6) fixedly connected to said casing (1) and including electric power conducting means (21) and a switch (22) for energizing and de-energizing said electric motor (20),
• said driving shaft (41) having a first rotational speed when said motor is energized,
• a driving mechanism (30) accommodated in said second hollow (5) and being drivingly connected to said driving shaft (41),
• said driving mechanism (30) including a driven shaft (42), means for rotating and means (60) for oscillating said driven shaft (42),
• said means for rotating said driven shaft (42) including a persistent, continuously engaging transmission means between said driving shaft and said driven shaft, which has a second rotational speed when said driving shaft rotates,
• said first rotational speed and said second rotational speed being similar,
• a tool holder (70) on said driven shaft (42) for holding a tool (100) having a working surface (101) adapted for sanding, rasping or filing a workpiece, and
• a guiding and supporting means(10) having mounting means (13,14) for being attached to said casing (1), wherein said continuously engaging transmission means comprises gear transmission means (40) and said means (60) for oscillating comprising a driving disk (61) and a follower member (63) and wherein interengaging means(62/64;
• 66/67) are provided such that when the disk (61) rotates the follower member (63) reciprocates, wherein said casing (1) has two shell halves (2,3), at least one thereof comprising partition wall means including a first partition wall (7) adjacent to said first hollow (4), and second and third partition walls (8,9) arranged transversely to said first partition wall, said first partition wall (7) having a first opening for accommodating a first bearing (32) for said driving shaft (41) and a second opening for accommodating a second bearing (33) for an intermediate shaft (43), a driving gear (46) of said gear transmission (40) being fixed to said driving shaft (41), first and second intermediate gears (50,47) of said gear transmission (40) being provided to drive said rotating disk (61) and said intermediate shaft (43) which has an end carrying a first bevel gear (48), said driving gear (46) meshing with said first intermediate gear (50) which is meshing with said second intermediate gear (47), said second partition wall (8) having a third opening for accommodating a third bearing (34), an intermediate hollow shaft (44) having two ends, one thereof being journalled and supported by said third bearing (34) and the other end thereof carrying a second bevel gear (49), said first and second bevel gears (48,49) meshing with one another, said intermediate hollow shaft (44) and said driven shaft (42) also comprising rotational coupling means (45) which allow axial reciprocating movement of said driven shaft (42) within said hollow shaft (44).