Abrading tool utilizing a self adhesive abrading sheet

Claim 2

The combination comprising: a shoe including a backing plate which is to extend essentially horizontally when abrading an upwardly facing work surface, and a cushion carried at the underside of said backing plate and having an undersurface; an abrading sheet extending along the underside of said cushion and carrying a layer of pressure sensitive adhesive at its upper side engaging the undersurface of said cushion and adhered thereto; said undersurface of the cushion being formed of a substance to which said adhesive will adhere tightly in use but from which the adhesive can be stripped with said sheet for replacement; said sheet extending upwardly at the forward end of said shoe and having a forward end portion doubled back generally rearwardly at the upper side of said backing plate; and means carried at the upper side of said backing plate near the forward end thereof and defining a locating recess into which said end portion of the sheet projects generally rearwardly without being clamped therein; said recess having upper and lower walls between which said end portion of the sheet is received and which are fixed relative to one another at a predetermined spacing which remains the same during an abrading operation as during insertion of said end portion of the sheet into said recess and removal therefrom; said end portion of the abrading sheet being engageable upwardly against said upper wall of said recess in a manner coacting with the adhesive attachment of said sheet to said undersurface in retaining the sheet about said forward end of the shoe without clamping the sheet within the recess or between said walls.

Claim 3

The combination as recited in claim 1, in which said recess has a rear wall facing forwardly at the back of said recess and engageable with a transverse forward end edge of said sheet to locate the sheet for proper alignment with the shoe.

Claim 4

The combination as recited in claim 1, in which said recess has a rear wall extending essentially vertically at the back of the recess and facing forwardly and lying essentially in a plane disposed transversely of said shoe to engage a transverse forward end edge of said sheet in a relation locating the sheet in proper alignment with the shoe.

Claim 5

The combination as recited in claim 1, in which said lower wall of said recess is an upper planar surface of said plate.

Claim 6

The combination as recited in claim 1, in which said upper and lower walls of said recess are essentially planar and disposed essentially parallel to one another.

Claim 7

The combination as recited in claim 1, in which said upper and lower walls of said recess are essentially planar and disposed essentially parallel to one another, said recess having a planar rear wall extending perpendicular to said upper and lower walls at the back of the recess and disposed transversely of said shoe at a location to engage and locate a transverse end of said sheet.

Claim 8

The combination as recited in claim 6, in which said planar upper and lower walls are spaced apart a distance confining said sheet closely therebetween while permitting sliding insertion of said end portion of the sheet into and sliding removal from the recess, said sheet having an abrasive material engaging said upper wall of the recess while said adhesive material engages the lower wall of the recess.

Claim 9

The combination as recited in claim 1, in which said cushion has a forward end surface engaged by said adhesive as the sheet extends upwardly at the front of the shoe.

Claim 10

The combination as recited in claim 1, in which said cushion has a forward portion projecting slightly beyond a forward edge of said backing plate and having a forwardly facing surface engaged by said adhesive as said sheet extends upwardly at the front of the shoe.

Claim 11

The combination as recited in claim 1, in which said abrading sheet has a rear end edge facing rearwardly at essentially the level of the undersurface of said cushion and which is secured to the shoe only by said adhesive.

Claim 12

The combination as recited in claim 1, in which said means include a fixed bracket part having a first portion engaging the upper side of said backing plate and secured thereto, and having a second portion with an undersurface spaced above and parallel to said backing plate and comprising said upper wall of the recess, said bracket part having a vertical shoulder at the juncture of said two portions facing forwardly and disposed transversely of the shoe for engaging an end edge of said sheet.

Claim 13

The combination as recited in claim 1, including a tool body above said shoe, a motor carried by said body for reciprocating said shoe in a front to rear direction relative to the body, and handle means on said body for holding it in a position in which said forward end of the shoe faces away from the person holding the tool.

Claim 14

The combination comprising: a shoe including a flat backing plate which is to extend essentially horizontally when abrading an upwardly facing work surface, and a cushion carried at the underside of said backing plate and having an irregularized undersurface; an abrading sheet extending along the underside of said cushion and carrying a layer of pressure sensitive adhesive at its upper side engaging said irregularized undersurface of said cushion and adhered thereto; said undersurface of the cushion being formed of a substance to which said adhesive will adhere tightly in use but from which the adhesive can be stripped with said sheet for replacement; said cushion having a forward portion extending forwardly slightly beyond a forward end edge of said backing plate and having a forwardly facing end surface; said abrading sheet extending upwardly at the forward end of said shoe past said forward end surface of said cushion and said forward end edge of said backing plate and having a forward end portion doubled back generally rearwardly at the upper side of said backing plate; said adhesive on said sheet being adhered to said forward end surface of said cushion; said plate having a planar upper surface; and a bracket carried at the upper side of said plate near the forward end thereof and having a first portion received adjacent said upper surface of said plate and secured rigidly thereto and a second portion forwardly of said first portion and spaced above said upper surface of the backing plate and having an undersurface parallel thereto and defining therewith a recess of fixed vertical dimension into which said end portion of the abrading sheet projects rearwardly without being clamped therein; said recess having the same fixed dimension during an abrading operation as during insertion of said end portion of the sheet into said recess and removal therefrom; said end portion of the abrading sheet having abrasive material engaging upwardly against said undersurface of said second portion of said bracket while said adhesive is enagageable against said upper surface of said plate within the recess; said bracket having a vertical shoulder disposed transversely of said shoe at the back of said recess for engaging a transverse end edge of said abrading sheet in locating relation.

Claim 15

The combination comprising: a shoe including a flat backing plate which is to extend essentially horizontally when abrading an upwardly facing work surface, and a cushion carried at the underside of said backing plate and having an irregularized undersurface; an abrading sheet extending along the underside of said cushion and carrying a layer of pressure sensitive adhesive at its upper side engaging said irregularized undersurface of said cushion and adhered thereto; said undersurface of the cushion being formed of a substance to which said adhesive will adhere tightly in use but from which the adhesive can be stripped with said sheet for replacement; said cushion having a forward portion extending forwardly slightly beyond a forward end edge of said backing plate and having a forwardly facing end surface; said abrading sheet extending upwardly at the forward end of said shoe past said forward end surface of said cushion and said forward end edge of said backing plate and having a forward end portion doubled back generally rearwardly at the upper side of said backing plate; said adhesive on said sheet being adhered to said forward end surface of said cushion; said plate having a planar upper surface; and a bracket carried at the upper side of said plate near the forward end thereof and having a first portion received adjacent said upper surface of said plate and secured rigidly thereto and a second portion forwardly of said first portion and spaced above said upper surface of the backing plate and having an undersurface parallel thereto and defining therewith a recess of fixed vertical dimension into which said end portion of the abrading sheet projects rearwardly without being clamped therein; said recess having the same fixed dimension during an abrading operation as during insertion of said end portion of the sheet into said recess and removal therefrom; said end portion of the abrading sheet having abrasive material engaging upwardly against said undersurface of said second portion of said bracket while said adhesive is enagageable against said upper surface of said plate within the recess; said bracket having a vertical shoulder disposed transversely of said shoe at the back of said recess for engaging a transverse end edge of said abrading sheet in locating relation.

Claim 16

The combination comprising: a shoe including a backing plate which is to extend essentially horizontally when abrading an upwardly facing work surface, and a cushion carried at the underside of said backing plate and having an undersurface to which a layer of adhesive on a self adhesive abrading sheet can detachably adhere; said undersurface of the cushion being formed of a substance to which said adhesive will adhere tightly in use but from which the adhesive can be stripped with said sheet for replacement; said cushion having a forward end face past which said abrasive sheet can extend upwardly at said forward end of the shoe and to which said adhesive of the abrasive sheet can adhere; and means carried at the upper side of said backing plate near the forward end thereof and defining a locating recess into which a forward end portion of the abrasive sheet can project generally rearwardly without being clamped therein; said recess having upper and lower walls between which said end portion of the sheet can be received and which are fixed relative to one another at a predetermined spacing which remains the same during an abrading operation as during insertion of said end portion of the sheet into said recess and removal therefrom.

Claim 17

The combination comprising: a shoe including a backing plate which is to extend essentially horizontally when abrading an upwardly facing work surface, and a cushion carried at the underside of said backing plate and having an undersurface to which a layer of adhesive on a self adhesive abrading sheet can detachably adhere; said undersurface of the cushion being formed of a substance to which said adhesive will adhere tightly in use but from which the adhesive can be stripped with said sheet for replacement; said cushion having a forward end face past which said abrasive sheet can extend upwardly at said forward end of the shoe and to which said adhesive of the abrasive sheet can adhere; and means carried at the upper side of said backing plate near the forward end thereof and defining a locating recess into which a forward end portion of the abrasive sheet can project generally rearwardly without being clamped therein; said recess having upper and lower walls between which said end portion of the sheet can be received and which are fixed relative to one another at a predetermined spacing which remains the same during an abrading operation as during insertion of said end portion of the sheet into said recess and removal therefrom.

Claim 18

The combination as recited in claim 14, in which said cushion projects forwardly slightly beyond the forward end of said backing plate.

Claim 19

The combination as recited in claim 14, in which said recess has a rear wall disposed essentially transversely of said shoe and engageable with an end edge of said abrading sheet in locating relation.

Claim 20

The combination as recited in claim 14, in which said means include a bracket having a first portion secured rigidly to said plate and having a second portion projecting forwardly therefrom at a location spaced above and essentially parallel to said plate to define said recess therewith.

Claim 21

The combination as recited in claim 14, in which said means include a bracket having a first portion secured rigidly to said plate and having a second portion projecting forwardly therefrom at a location spaced above and essentially parallel to said plate to define said recess therewith, said bracket having a vertical shoulder at the juncture of said portions and disposed transversely of said shoe for engaging a transverse end edge of the abrading sheet in locating relation.