(19)
(11) EP 1 872 908 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.05.2011 Bulletin 2011/18

(43) Date of publication A2:
02.01.2008 Bulletin 2008/01

(21) Application number: 07111194.2

(22) Date of filing: 27.06.2007
(51) International Patent Classification (IPC): 
B25D 11/12(2006.01)
F16C 3/14(2006.01)
 B25D 17/26(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK RS

(30) Priority: 01.07.2006 GB 0613181
05.07.2006 GB 0613323

(71) Applicant: Black & Decker, Inc.
Newark, DE 19711 (US)

(72) Inventors:
  • Friedrich, Andreas
    65551, Lumburg (DE)
  • Frantisek, Harcar
    SK-08271, Lipany (SK)

(74) Representative: Bell, Ian Stephen et al
Black & Decker Patent Department 210 Bath Road
Slough Berkshire SL1 3YD
Slough Berkshire SL1 3YD (GB)

   


(54) A Lubricant System for a Hammer Drill


(57) A hammer drill comprising: a piston (50) slideably mounted within a housing; a drive mechanism which converts the rotary output of the motor (32) into a reciprocating motion of the piston (50); lubrication fluid covering at least part of the drive mechanism; wherein the drive mechanism comprises: A) a crank mechanism comprising: a crank shaft (38) rotationally driven by the motor (32); and a drive pin (40) eccentrically mounted via a support structure (42) on the drive shaft (38); B) a con rod (48), one end of which being connected to the drive pin (40) via a bearing (334), the other end being connected to the piston (50); wherein there is further provided a guide mechanism (318), in the form of a groove in the support structure which extends away from the base of the drive pin (40) towards the longitudinal axis (46) of rotation of the crank shaft (38), to direct the movement of a part of some of the lubricating fluid towards the bearing (334), the movement of that lubrication fluid being caused by the centrifugal forces acting on that lubrication fluid generated by the rotation of the crank shaft (38).







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