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| Number | Title | Issue Date |
| 7096972 | Hammer drill attachment Power tools of the type under consideration include hammer drills, for example, which are electric or battery powered and includes two modes of operation: a rotation mode and a rotation-hammer mode. A manually operable selector lever enables the hammer drill to be s... | 08/29/2006 |
| 7044479 | Steel retainer for rock drill A simple and positive drill steel retainer comprises a retainer and a latch. The retainer cannot be opened until the latch is disengaged. The latch is held in the engaged position by a spring. The retainer and latch can be easily operated with one hand. ... | 05/16/2006 |
| 6935436 | Double-headed tent stake driver and puller having twin release levers A double-headed tent stake driver and puller having twin release levers for inserting and removing tent stakes, nails and the like is described. The tent stake driver and puller includes a slide hammer and a coupler mounted on the distal end of the slide hammer shaf... | 08/30/2005 |
| 6705409 | Reciprocating tool having a piston retaining system Disclosed is a reciprocating pneumatic tool including first, second and third piston retaining mechanisms for preventing the piston from freely exiting the barrel of the tool when the retaining sleeve and workpiece are removed. The retaining mechanisms are located w... | 03/16/2004 |
| 6155356 | Percussion tool A hammer holder, provided between a retainer sleeve and a cylinder, slidably holds an intermediate member in an axial direction. A predetermined clearance is maintained between the hammer holder and the retainer sleeve. The hammer holder has a recessed po... | 12/05/2000 |
| 5511800 | Reciprocal chuck for paving breaker A handheld paving breaker includes a reciprocal chuck in a front head and an elastic spring for biasing the chuck toward the fronthead. The chuck can move longitudinally, but is restrained from rotation in the fronthead. A moil mounted in the chuck is bia... | 04/30/1996 |
| 5450911 | Safety arrangement for driving tools A railroad spike driving tool (30) is adapted to be inserted by its shank (22') for cooperation into hand-held hammer machines of the type comprising a machine housing (10) with a cylinder (11), in which a reciprocating drive piston (14) via a gas cushion... | 09/19/1995 |
| 5431235 | Reciprocal chuck for paving breaker A handheld paving breaker includes a reciprocal chuck in a front head and an elastic spring for biasing the chuck toward the fronthead. The chuck can move longitudinally, but is restrained from rotation in the fronthead. A moil mounted in the chuck is bia... | 07/11/1995 |
| 5330202 | Tool retainer for a percussive, fluid-activated apparatus A drill steel retainer for a jackhammer includes a latch pivotally mounted on the front head of the jackhammer, a detent mechanism for retaining the latch in a tool retaining and tool releasing position, and a stop member on the fronthead for insuring spa... | 07/19/1994 |
| 4773657 | Drill apparatus The drill chuck body is connected to a drill spindle, and chuck jaws forming a retention for the drill tool can be adjusted by turning a control ring. A lock sleeve serves to secure the control ring whereby the lock sleeve, in the direction of shifting, i... | 09/27/1988 |
| 4664568 | Drill chuck for grooved and ungrooved drill-bit shanks 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 surf... | 05/12/1987 |
| 4648609 | Driver tool A torsion or hairpin spring external attachment for power hammers has eye ends respectively bottomed on the power hammer casing and on the tool driven by the hammer for maintaining the tool against the work and supporting a load on the power hammer while ... | 03/10/1987 |
| 4231580 | Lost motion tool retainer The invention permits the interchangeability of a variety of shifters on the same housing of a jack hammer. The one piece housing is provided with two appropriately placed lugs with coaxial holes which intersect with the central bore of the housing. By ut... | 11/04/1980 |
| 3972376 | Adapter assembly for impact tool units with rotatable or oscillatable bits An adapter assembly incorporating the lower chuck end of a rotary impact tool unit, the support means thereof, and the tool bit extending from the lower end thereof. The impact tool unit is of the general type in which the impact motor is not connected di... | 08/03/1976 |
