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US 3,965,801 AGranted
Straight line abrading tool
OwnerAlma A. Hutchinsinventor
Life of this patent
Estimating the term…
Abstract
A portable abrading tool having a cylinder body containing a double ended piston with a reduced dimension intermediate portion of the piston carrying two oppositely facing racks engageable with two gear units which in turn engage two additional oppositely facing racks on a shoe to cause reciprocation thereof. A valving mechanism may include a rotatably oscillatable gear sector containing a pocket recess loosely receiving a valve element in a lost motion relation. An aspirator may be provided for withdrawing air and abraded particles from the vicinity of a work surface.
Claims14
Apparatus comprising:
- a structure reciprocable by pressure fluid alternately admitted to two different chambers;
- means forming a surface containing fluid passing valving apertures;
- an actuating part mounted for limited rotary oscillating movement about a predetermined axis and near said surface;
- a valve element slidable across and relative to said surface in a relation controlling the fluid flow through said apertures to produce said reciprocation, and connected to siad actuating part for oscillation thereby;
- said actuating part being free from limited turning movement about said axis relative to said valve element so that upon movement in each rotary direction said part first turns through a predetermined angle without displacing said valve element and then turns through a further angle with the valve element to shift it relative to said surface and apertures;
- said apertures including two circularly spaced apertures communicating with said two chambers respectively to deliver pressure fluid thereto, and a circularly intermediate aperture communication with the atmosphere;
- said actuating part containing a confining recess loosely receiving said valve element for lost motion of the actuating part relative thereto;
- said valve element having a recess at its underside facing said surface for placing said intermediate aperture in communication with said two first mentioned apertures alternately;
- a pressure fluid inlet passage leading inlet fluid to a side of said valve element facing away from said surface in a relation urging said valve element against said surface while alternately passing said inlet fluid to said two first mentioned passages when they are not covered by the valve element;
- a gear unit having teeth engagable by said reciprocable structure to turn the gear unit about a second axis in response to reciprocation of said structure;
- said gear unit having additional teeth engaging said actuating unit;
- said actuating unit being a gear sector having teeth meshing with said last mentioned teeth of the gear unit to turn the actuating part about said first axis in response to turning movement of said gear unit about said second axis.
9 more elements
An improved valve assembly for a reciprocating mechanism comprising:
- means forming a surface containing fluid passing valving apertures;
- a gear sector mounted for limited rotary oscillating movement about a predetermined axis, with said surface near and facing toward said sector, said sector having a series of gear teeth extending arcuately about said axis;
- a drive gear mounted for rotary oscillating movement about a second axis essentially parallel to said first axis, and having teeth meshing with said teeth of said sector to rotatively oscillate said sector about said first axis in response to rotary movement of said drive gear about said second axis;
- a valve element slidable across and relative to said surface in a relation controlling the fluid flow through said apertures to produce said reciprocation, and connected to said gear sector for oscillation thereby;
- said sector being free for limited turning movement about said first axis relative to said valve element so that upon movement in each rotary direction said sector first turns through a predetermined angle without displacing said valve element and then turns through a further angle with the valve element to shift it relative to said surface and apertures.
2 more elements
An improved valve assembly for a reciprocating mechanism, comprising:
- means forming a surface containing fluid passing valving apertures;
- an actuating part mounted for limited rotary oscillating movement about a predetermined axis and near said surface and containing an opening essentially opposite said surface;
- a valve element slidable across and relative to said surface in a relation controlling the fluid flow through said apertures, and contained loosely in said opening for oscillation by said actuating part;
- said opening in the actuating part being defined by radially inner and outer edges positioned to engage said valve element in a relation confining the valve element against movement toward or away from said axis, and by opposite side edges spaced apart far enough to allow limited turning movement of said actuating part about said axis relative to said valve element so that upon movement in each rotary direction said actuating part first turns through a predetermined angle without displacing said valve element and then turns through a further angle with said valve element to shift it relative to said apertures.
1 more element
An improved valve assembly for a reciprocating mechanism, comprising:
- means forming a surface containing fluid passing valving apertures;
- an actuating part mounted for limited rotary oscillating movement about a predetermined axis and near said surface;
- and
- a valve element slidable across and relative to said surface in a relation controlling the fluid flow through said apertures to produce said reciprocation, and connected to said actuating part for oscillation thereby;
- said actuating part being free for limiting turning movement about said axis relative to said valve element so that upon movement in each rotary direction said part first turns through a predetermined angle without displacing said valve element and then turns through a further angle with the valve element to shift it relative to said surface and apertures;
- said apertures being defined by arcuate inner and outer edges and circularly spaced radially extending side edges, said valve element having a recess at its underside for placing said apertures in communication and of essentially arcuate configuration having arcuate inner and outer edges and circularly spaced radially extending opposite side edges.
3 more elements
Dependencies are inferred from the claim text.