Reciprocated concrete surfacer member with shielded spring return

A scabbler for removing a surface portion of concrete, rock and the like and having a reciprocating bit with an outer downwardly directed portion adapted to act on said surface, said scabbler having a cylinder in which a reciprocated rod is movable, said scabbler including:

• (a) a base member disposed to accept and retain at least one cylinder in a determined orientation with the cylinder extending below the base a determined amount;
• (b) a bit with an attached shank of a reduced and substantially constant diameter, said shank having one end adapted to be engaged and moved by said reciprocated rod;
• (c) a retainer adapted to enclose nearly all of that shank of the bit when said bit is at its upward extent;
• (d) means for securing the retainer to a fixed member and provide external protection of the attached bit shank from dust, dirt, slurry and the like;
• (e) a compression spring disposed around the shank of the bit and when mounted and in operating condition adapted to urge the bit shank toward the reciprocated rod;
• (f) a washer slidable on said shank of the bit with said washer restrained from further upward movement along said shank of the bit by a retaining pin insertable in and carried in an aperture formed in said shank, said washer providing means for retaining an upper end of said spring and urging said shank upwardly;
• (g) means for retaining a lower end of said spring to the lower end of the retainer, and
• (h) means for sealing the retainer at its lower end so as to provide external protection of the bit shank as it is reciprocated, this seal excluding the shank and interior of the retainer from dust, dirt, slurry and the like.