Patents by Inventor Gunter H. Rohm

Gunter H. Rohm has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4690416
    Abstract: The jaws of the chuck include a base jaw and a separate, releasable mounting jaw. These two jaw components are connected by at least one shaft which is guided with male-type screw threads in its one end in female-type screw threads of the base jaw. The other end has a lock head which has a projecting lock shoulder, and which lock head can engage in axial direction into a lock retainer in the mounting jaw, when the shaft has been rotated into the position corresponding to the unlocked condition. When the shaft has been rotated into the position which corresponds to the locked condition, it can engage with its lock shoulder in a dovetail formation in axial and positive locking manner. The shaft is further shaped with gear teeth which can operate in the manner of a pinion. In the apparatus there is also provided a control bolt extending transversely to the axis and guided and adapted to be shifted in its longitudinal direction in the base jaw.
    Type: Grant
    Filed: March 20, 1986
    Date of Patent: September 1, 1987
    Inventor: Gunter H. Rohm
  • Patent number: 4669741
    Abstract: The power chuck is particularly intended for holding crankshafts. The chuck has a base, a head, and clamping jaws. The head is radially guided with respect to a clamping axis which extends parallel to an axis of rotation. The clamping jaws are connected to a drive piston by way of axially movable wedge members which can be axially displaced in the base. The chuck also has a holding body which is reciprocatingly guided at the base. When considered in transverse direction with respect to its direction of displacement, the holding body has a width which is smaller than the diameter of the base. Parallel thereto and on both sides of the holding body are arranged movably guided counterbalancing elements, and they are each connected by way of a gear wheel in a countercurrent manner to the body. Several clamping jaws are separated into an inner part and an outer part, of which the inner part is guided in the holding body, and the outer part with the wedge member connected to it is guided in the base.
    Type: Grant
    Filed: December 19, 1985
    Date of Patent: June 2, 1987
    Inventor: Gunter H. Rohm
  • Patent number: 4664568
    Abstract: A chuck centered on an axis and having a plurality of jaws each displaceable radially of the chuck axis is usable in combination with a drill bit having a shank formed with respective grooves each having axially extending and angularly directed flank surfaces engageable with the jaws to rotationally link the bit to the chuck. Each jaw is substantially symmetrical to a respective jaw plane extending substantially radially of the chuck axis. In addition each jaw is formed with a pair of angularly spaced teeth substantially symmetrically flanking the respective jaw plane and each having a respective inwardly directed edge and an outer tooth surface extending radially back therefrom and angularly away from the respective jaw plane.
    Type: Grant
    Filed: October 18, 1985
    Date of Patent: May 12, 1987
    Inventor: Gunter H. Rohm
  • Patent number: 4658912
    Abstract: A percussion drill has a percussion drill spindle and a drill chuck member which is turned and axially driven by the spindle. The drill chuck member has an axial passage through which the respective percussion action can be transferred from the spindle to that end of the drill which is held between centrically movable and adjustable chuck jaws. The drill chuck member can be axially moved on the percussion drill spindle, and the distance of movement can be limited in the forward direction towards the drill by an abutment. The abutment is formed, on the one hand, by an annular collar which is arranged at the percussion drill spindle and, on the other hand, by an annular shoulder member which surrounds the percussion drill spindle and which is formed in the chuck body. The collar and the shoulder member have opposing surfaces which provide large contact areas during impact or operational strokes.
    Type: Grant
    Filed: April 23, 1985
    Date of Patent: April 21, 1987
    Inventor: Gunter H. Rohm
  • Patent number: 4645387
    Abstract: A chuck has a rear chuck part centered on a rear axis and adapted to be secured to the spindle of a drill for rotation about the rear axis, a front chuck part centered on a front axis, and a universal joint interconnecting the two parts for joint rotation about the rear axis with the front axis movable between a position on the rear axis and a position with the front axis intersecting and skew, that is nonparallel, to the rear axis. Jaws on the front chuck part can be radially displaced thereon relative to the front axis to clamp a tool--a tap or drill bit--at the front axis in the front part. A locking element carried on one of the parts is engageable with the other part for holding the parts with the axes coaxial and nondisplaceable relative to each other.
    Type: Grant
    Filed: October 3, 1985
    Date of Patent: February 24, 1987
    Inventor: Gunter H. Rohm
  • Patent number: 4627185
    Abstract: A safety mechanism for a revolver having a breech lock arranged at the drum on a breech lock shaft and able rotate to enable loading of the respective cartridge chamber. When the breech lock is swung out, a detent latch is disengaged from the drum catch by way of the breech lock shaft and a check part. A lock unit cooperates with the breech lock shaft, and this lock unit includes a movably guided lock member, a pin in one embodiment, which extends generally parallel with respect to the axis of rotation of the cock and which is controllable and adjustable by the breech lock shaft when the breech lock shaft is swung out in the direction towards the cock. The cock includes a lateral surface which extend substantially perpendicularly with respect to the axis about which the cock can pivot, and which forms a stop for the lock unit. In this surface there is also included a retaining recess into which the lock member can enter when the cock is in its rest position when the breech lock is swung out.
    Type: Grant
    Filed: January 18, 1985
    Date of Patent: December 9, 1986
    Inventor: Gunter H. Rohm
  • Patent number: 4627626
    Abstract: The chuck for holding a drill bit by its drill bit shaft comprises a chuck body connected to a drive shaft, a mounting opening in the chuck body in which the drill bit shaft is held coaxial with the chuck axis, a plurality of clamp jaws guided in the chuck body so as to be centrally advanceable to and retractable from the chuck axis in the mounting opening, an axial passage in the chuck body between the drive shaft and the mounting opening, through which hammer blows are transmitted to the drill bit shaft found in the mounting opening. In the mounting opening a chuck sleeve is clamped rigidly between the clamp jaws and in the chuck sleeve the drill bit shaft is guided slidably axially.
    Type: Grant
    Filed: April 23, 1985
    Date of Patent: December 9, 1986
    Inventor: Gunter H. Rohm
  • Patent number: 4627627
    Abstract: A drill chuck is secured on a drill spindle so as to be actuated thereby. The drill chuck has an axial passage through which the impact effect of a central anvil shaft is transferred to the end of the drill held in the drill chuck. The drill chuck can be connected to the drill spindle by coupling elements respectively arranged in coupling retainers of the drill spindle and/or the chuck body. The coupling retainers are axially of greater longitudinal dimension than the coupling elements, and permit axial displacement of the drill chuck. A contact ring which can not be displaced in axial direction presents an annular surface towards a further annular surface at the drill chuck body. Abutment projections can preclude axial displacement of the drill chuck on the drill spindle, and associated abutment recesses are also provided into which the abutment projections fit at least to a depth equivalent to the axial displacement movement of the drill chuck.
    Type: Grant
    Filed: June 11, 1985
    Date of Patent: December 9, 1986
    Inventor: Gunter H. Rohm
  • Patent number: 4627628
    Abstract: A drill chuck for a hammer drill with a plurality of clamp jaws fed in feed channels to engage a drill in a tool holder, the clamp jaws being adjustable by means of a support ring, the support ring bearing a restraining casing having teeth thereon which can engage gearing in the support ring so as to lock it against further rotation. The restraining casing is lockable in two axial positions, in one position in engagement with the support ring, in the other out of engagement with the support ring. The restraining casing is slid into engagement with the support ring in a covering jacket which holds the restraining casing axially tightly so that drilling waste can not impede engagement of the restraining casing with the support ring. Cleaning passages run through the chuck body from the tool holder to the surroundings so that drilling waste will be removed from the tool holder and the chuck interior during drilling operation.
    Type: Grant
    Filed: February 21, 1985
    Date of Patent: December 9, 1986
    Inventor: Gunter H. Rohm
  • Patent number: 4623155
    Abstract: A drill chuck for a hammer drill apparatus or the like having a plurality of clamp jaws advanceable to and retractable from a chuck drill axis so as to be able to grasp and hold a drill, wherein each of the clamp jaws is advanced into and retracted from a chuck opening in the chuck in a feed channel directed toward, and preferably perpendicular to, the chuck drill axis and further oriented so that the clamp jaws engage and hold the drill in the chuck opening when advanced in the channels, each of the feed channels being conformed so that each of the clamp jaws fits movably, but sufficiently tightly, therein so that drilling dirt does not penetrate between the clamp jaws and the surfaces of the feed channels, and the drill chuck is provided with a plurality of open cleaning passages connecting the interior wall of the chuck opening adjacent a mouth of one of the feed channels to the outside through the chuck.
    Type: Grant
    Filed: December 5, 1984
    Date of Patent: November 18, 1986
    Inventor: Gunter H. Rohm
  • Patent number: 4621820
    Abstract: A drill chuck assembly for a percussion or hammer drill in which the chuck body is mounted on a rotatable drill spindle and the hammer impact is transmitted by a ram through the spindle to the bit retained in the chuck. A coupling ring surrounding a coaxial portion of the chuck body and the spindle has three angular positions in one of which the chuck body can be withdrawn axially from the spindle and in the second and third of which the body is retained on the spindle. Formations between a shoulder of the spindle and the coupling ring come into play in the second position to permit limited axial displacement of the chuck body on the spindle and are effective in the third position to prevent such axial displacement.
    Type: Grant
    Filed: April 5, 1985
    Date of Patent: November 11, 1986
    Inventor: Gunter H. Rohm
  • Patent number: 4621819
    Abstract: A hammer drill having a drive spindle rotatable about a spindle axis and a hammer displaceable axially in the drive spindle has a chuck in turn having a generally tubular chuck body centered on a chuck axis, formed with an axially centered array of axially backwardly open recesses, and having a central axially extending passage adapted to receive the shank of a drill bit. The body normally is carried on the spindle and receives the shank of the drill bit in its passage with the spindle, shaft, and chuck axes all coaxial. The hammer projects axially forward into the passage and is engageable therein with the bit. A plurality of jaws radially but not angularly displaceable in the chuck body have inner ends engageable with the drill-bit shank. An adjustment ring centered on the chuck axis, rotatable thereabout on the chuck body, and coupled to the jaws can move same radially synchronously and thereby center the bit in the body by engagement of the inner ends with the shank.
    Type: Grant
    Filed: September 26, 1984
    Date of Patent: November 11, 1986
    Inventor: Gunter H. Rohm
  • Patent number: 4621445
    Abstract: A revolver having a trigger and a hammer which are each pivotally journaled in the weapon frame. When the hammer is brought into its tensioned position, it moves the trigger into the ready-to-fire position in which the trigger arrests the hammer in the tensioned position. For locking the trigger in its rest position when the hammer is in its rest position, a lock part is movably guided directly between the trigger and the hammer. The lock part is in a locking position with respect to the trigger when the hammer and the trigger are in their respective rest positions. When the hammer is moved from its rest position into its tensioned position, the lock part assumes, via associated run-off surfaces, a position permitting pulling of the trigger into the ready-to-fire position. The movement from its tensioned position of the rebounding hammer is effected without interference in sliding manner due to the respective run-off surfaces.
    Type: Grant
    Filed: January 18, 1985
    Date of Patent: November 11, 1986
    Inventor: Gunter H. Rohm
  • Patent number: 4621818
    Abstract: The drill chuck comprises a chuck body connected to a drive shaft of a drilling drive device so as to deliver hammer blows to the working tool (e.g. the drill) of a hammer drill and the like, a plurality of clamp jaws which axially guide and hold the drill bit centered on the chuck axis, and a catch device which optionally acts to restrain the drill bit from rotary slipping with respect to the chuck body. The chuck jaws are positioned to axially overlap any axially extending working grooves provided in the drill bit shaft. At least one catch device is provided circumferentially between the clamp jaws, is radially movable in the chuck body and is constructed to engage in grooves running axially in the drill bit shaft or not according to the desire of the operator without loosening during drilling.
    Type: Grant
    Filed: May 7, 1985
    Date of Patent: November 11, 1986
    Inventor: Gunter H. Rohm
  • Patent number: 4619461
    Abstract: A drill chuck is rotatably driven by a drill spindle, on which the drill chuck is mounted by a plurality of radial lugs so as to prevent relative rotation, these lugs engaging in catch recesses in the drill chuck, which allow axial free play of the drill chuck on the drill spindle, unless prevented by adjusting a shift member mounted adjustably on the drill chuck without contact with and with axial clearance from the drill spindle. The lugs are rigidly connected with the drill spindle and lie axially against adjacent opposing shift member surfaces on both sides of the drill chuck. According to the rotary position of a shift member the lugs press directly on the adjacent shift member surfaces preventing axial free play of the drill chuck on the drill spindle and transmitting the drilling force or they lie opposite indentations in the shift member with clearance from the shift member surface so as to allow axial motion free play.
    Type: Grant
    Filed: April 4, 1985
    Date of Patent: October 28, 1986
    Inventor: Gunter H. Rohm
  • Patent number: 4619460
    Abstract: A chuck is used with a hammer drill having a drive spindle rotatable about a spindle axis and a hammer displaceable axially in the drive spindle, and with a drill bit having a shaft extending along a shaft axis and having a radially outwardly open and at least generally axially extending groove. The chuck has a generally tubular chuck body centered on a chuck axis and having a central axially extending passage. This body is normally carried on the spindle and receives the shaft of the drill bit in its passage with the spindle, shaft, and chuck axes all coaxial. The hammer projects axially forward into the passage and is engageable therein with the bit. A plurality of jaws radially but not angularly displaceable in the chuck body have inner ends engageable with the drill-bit shaft and in turn provided with formations complementarily engageable in the groove thereof.
    Type: Grant
    Filed: March 21, 1984
    Date of Patent: October 28, 1986
    Inventor: Gunter H. Rohm
  • Patent number: 4616383
    Abstract: A belt buckle plate having a rear face formed with a pair of axis-defining pivots one of which is a radially closed eye and the other of which has a radially open slot. A loop adapted to engage through the end of a belt has a short pintle and a long pintle extending in the same direction from the loop in line with one another. The short pintle normally extends on the axis through the eye pivot and the long pintle normally extends in a fully engaged position on the axis through and at least a predetermined axial distance in one axial direction past the slotted pivot. A retainer formation is provided on the rear face spaced axially less than the predetermined distance in the one direction from the slotted pivot and normally bearing radially on the long pintle in the fully engaged position thereof to hold it in the slotted pivot. A radial projection is provided on the long pintle axially offset in the one axial direction in the fully engaged position thereof from the slotted pivot by the predetermined distance.
    Type: Grant
    Filed: October 24, 1985
    Date of Patent: October 14, 1986
    Inventor: Gunter H. Rohm
  • Patent number: 4609199
    Abstract: A hammer-drill chuck has a tubular chuck body centered on an axis and formed with a plurality of guides angularly spaced thereabout, respective jaws displaceable along the guides between inner and outer positions, and an adjustment element displaceable on the body and coupled to the jaws for displacing same between their inner and outer positions. Thus the rear end of a drill bit can be fitted into the passage and gripped between the jaws. A spindle centered on, rotatable about, and reciprocal through a predetermined stroke along the axis projects partially through the chuck body so the rear end of the bit gripped by the jaws can be hammered by a front end of the spindle. At least one coupling element radially but not axially or angularly displaceable in the chuck body engages an axially extending formation on the spindle which is of such an axial length that when the spindle reciprocates axially relative to the chuck body it urges the coupling element radially outward.
    Type: Grant
    Filed: February 15, 1985
    Date of Patent: September 2, 1986
    Inventor: Gunter H. Rohm
  • Patent number: 4607855
    Abstract: A drill chuck includes a chuck body connected to a drilling spindle and having a tool holding fixture for retaining a drill bit between jaws. Accommodated in the chuck body is a through-passage which leads to the tool holding fixture and through which the impact of the spindle onto the drill bit is transmitted. A tightening ring is rotatable about the chuck body in order to allow loosening and tightening of the drill bit and is connected to an adjusting sleeve which is arranged at a distance to the chuck body to define an annular space therebetween. In order to allow discharge of any dirt penetrating through the jaws and into the tool holding fixture channels are provided between one end of the annular space and the tool holding fixture. The other end of the annular space is connected to the outside so that dirt can be transported through the channels and the annular space towards the outside.
    Type: Grant
    Filed: December 26, 1984
    Date of Patent: August 26, 1986
    Inventor: Gunter H. Rohm
  • Patent number: 4602799
    Abstract: A chuck has a chuck body centered on a chuck axis and having an axially forwardly opening and axially centered recess and an adjustment ring rotatable but not axially displaceable on the chuck body, having a central hole aligned with the recess, and formed with a plurality of guide passages open radially inwardly into the hole. The body and ring normally are carried on a drill spindle with the shank of a drill bit through the recess and hole and the spindle, shank, and chuck axes all coaxial. Respective jaws radially displaceable in the passages have inner ends engageable with the drill-bit shank in the recess. The chuck body has a face directly axially confronting the jaws and formed with an axially projecting spiral ridge. The jaws have axially projecting teeth complementary to and engaging with the ridge. Thus relative rotation of the body and ring about the axis radially displaces the jaws in the ring.
    Type: Grant
    Filed: October 5, 1984
    Date of Patent: July 29, 1986
    Inventor: Gunter H. Rohm