Portable sander

Claim 2

A portable sander comprising: a motor, said motor comprising a circulator, at least one circulating member in the circulator and a compressed air inlet to the circulator to admit compressed air for circulating said at least one circulating member in the circulator at a high speed to generate continuous rotational vibration by the centrifugal force of said at least one circulating member; a sanding table for carrying an abrasive material, said sanding table being rigidly secured to the underside of said motor, and said sanding table including an elongated leg projecting from the undersurface thereof, said leg being made of hard rubber, and a shaped sanding body for carrying an abrasive material secured to said projecting leg, vibration being transmitted to said abrasive material substantially only in the lengthwise direction of said elongated leg; a handle; and at least one resilient support means resiliently mounting said handle to the upper side of said motor.

Claim 3

A sander as claimed in claim 1, wherein each said support leg includes upper and lower portions, a pair of metal cores, said metal cores being respectively embedded in said upper and lower portions of the support leg, upper and lower end surfaces of the support leg comprising large face fixing portions, and wherein a concave track is provided on the handle and a concave track is provided on the motor, said large face fixing portions being secured to respective concave tracks by fixing bolts engaging in the metal cores.

Claim 4

A sander as claimed in claim 1, wherein the handle comprises a skirt, said skirt having two sides, said sides being indented so as to form a waist adapted for gripping by a hand, and an upper cover portion having a smooth and curved upper surface, said upper cover portion having a front portion, one end of said front portion being cut out; said sander further comprising a valve controlling mechanism for controlling the compressed air and a movable control member for the valve controlling mechanism, said valve controlling mechanism being mounted in the handle and said movable control member being accessible at the cut out portion of said handle.

Claim 5

A portable sander comprising: a motor, said motor comprising a circulator having a compressed air supply column at the central portion thereof, at least one circulating member in the circulator, said circulating member being of annular form and encircling said air supply column, and a compressed air inlet to the circulator to admit compressed air for circulating said at least one circulating member in the circulator at a high speed to generate continuous rotational vibration by the centrifugal force of said at least one circulating member; a sanding table for carrying an abrasive material, said sanding table being rigidly secured to the underside of said motor; a handle; and at least one resilient support means resiliently mounting said handle to the upper side of said motor.

Claim 6

A portable sander comprising: a motor, said motor comprising a circulator having a compressed air supply column at the central portion thereof, at least one circulating member in the circulator, said circulating member being of annular form and encircling said air supply column, and a compressed air inlet to the circulator to admit compressed air for circulating said at least one circulating member in the circulator at a high speed to generate continuous rotational vibration by the centrifugal force of said at least one circulating member; a sanding table for carrying an abrasive material, said sanding table being rigidly secured to the underside of said motor; a handle; and at least one resilient support means resiliently mounting said handle to the upper side of said motor.

Claim 7

A sander as claimed in claim 4 wherein said sanding table includes an elongated leg projecting from the undersurface thereof, said leg being made of hard rubber, and a shaped sanding body for carrying an Abrasive material secured to said projecting leg, vibration being transmitted to said abrasive material substantially only in the lengthwise direction of said elongated leg.

Claim 8

A sander as claimed in claim 4, wherein a groove is formed in an outer circumferential surface of the circulating member.

Claim 9

A sander as claimed in claim 4, wherein a groove is formed in an inner circumferential surface of said circulator.

Claim 10

A sander as claimed in claim 4, wherein said compressed air supply column is hollow and forms a supply passage for compressed air, and further comprising a vane plate, said vane plate being mounted at least partly within said column, said vane plate having an air guiding formation at one side thereof and said vane plate being freely radially movable relative to said column.

Claim 11

A portable sander comprising: a motor, said motor comprising a circulator having a compressed air supply column forming a supply passage for compressed air, a vane plate, the vane plate being mounted in a cut-out portion formed in said column, the vane plate being freely radially movable in said cutout portion, an air port formed at one side of said cutout portion, a first annular circulating member with an inner diameter greater than the outer diameter of said column, said first annular circulating member freely rotatably encircling said column, and a second annular circulating member with an inner diameter greater than the outer diameter of the first annular circulating member, said second annular circulating member freely rotatably encircling said first annular circulating member and a compressed air inlet to the circulator supply passage to admit compressed air for circulating said circulating members in the circulator at a high speed to generate continuous rotational vibration by the centrifugal force of said circulating members; a sanding table for carrying an abrasive material, said sanding table being rigidly secured to the underside of said motor; a handle; and at least one resilient support means resiliently mounting said handle to the upper side of said motor.

Claim 12

A portable sander comprising: a motor, said motor comprising a circulator having a compressed air supply column forming a supply passage for compressed air, a vane plate, the vane plate being mounted in a cut-out portion formed in said column, the vane plate being freely radially movable in said cutout portion, an air port formed at one side of said cutout portion, a first annular circulating member with an inner diameter greater than the outer diameter of said column, said first annular circulating member freely rotatably encircling said column, and a second annular circulating member with an inner diameter greater than the outer diameter of the first annular circulating member, said second annular circulating member freely rotatably encircling said first annular circulating member and a compressed air inlet to the circulator supply passage to admit compressed air for circulating said circulating members in the circulator at a high speed to generate continuous rotational vibration by the centrifugal force of said circulating members; a sanding table for carrying an abrasive material, said sanding table being rigidly secured to the underside of said motor; a handle; and at least one resilient support means resiliently mounting said handle to the upper side of said motor.

Claim 13

A portable sander comprising: a motor, said motor comprising a circulator, at least one circulating member in the circulator and a compressed air inlet to the circulator to admit compressed air for circulating said at least one circulating member in the circulator at a high speed to generate continuous rotational vibration by the centrifugal force of said at least one circulating member; a sanding table for carrying an abrasive material, said sanding table being rigidly secured to the underside of said motor; a handle having a skirt; at least one resilient support means resiliently mounting said handle to the upper side of said motor; and a two-knock type valve controlling mechanism including a movable valve body for selectively controlling the amount of compressed air fed to the motor; a controlling rod coupled to the movable valve body and being freely slidably suspended and enclosed in a fixed cylinder body on the upper surface of the skirt of the handle; an engaging groove peripherally provided at the front portion of the inner surface of said fixed cylinder body; a movable cylinder body being freely and axially slidably enclosed within the rear portion of said fixed cylinder body, said controlling rod being slidably mounted in said fixed cylinder body and in said movable cylinder body; and an engaging ring made of an elastic material provided in a peripheral groove at one end of said controlling rod, such that when said engaging ring is in engagement with the engaging groove of said fixed cylinder body the air supply to said motor is off, and when said engaging ring is in engagement with a space formed between the end of said movable cylinder body and said fixed cylinder body the valve body is moved to open the valve and the compressed air is fed to said motor, and when said controlling rod is actuated to move said engaging ring out of said space anD interior of said movable cylinder body, said valve body is caused to move to close the valve.

Claim 14

A portable sander comprising: a motor, said motor comprising a circulator, at least one circulating member in the circulator and a compressed air inlet to the circulator to admit compressed air for circulating said at least one circulating member in the circulator at a high speed to generate continuous rotational vibration by the centrifugal force of said at least one circulating member; a sanding table for carrying an abrasive material, said sanding table being rigidly secured to the underside of said motor; a handle having a skirt; at least one resilient support means resiliently mounting said handle to the upper side of said motor; and a two-knock type valve controlling mechanism including a movable valve body for selectively controlling the amount of compressed air fed to the motor; a controlling rod coupled to the movable valve body and being freely slidably suspended and enclosed in a fixed cylinder body on the upper surface of the skirt of the handle; an engaging groove peripherally provided at the front portion of the inner surface of said fixed cylinder body; a movable cylinder body being freely and axially slidably enclosed within the rear portion of said fixed cylinder body, said controlling rod being slidably mounted in said fixed cylinder body and in said movable cylinder body; and an engaging ring made of an elastic material provided in a peripheral groove at one end of said controlling rod, such that when said engaging ring is in engagement with the engaging groove of said fixed cylinder body the air supply to said motor is off, and when said engaging ring is in engagement with a space formed between the end of said movable cylinder body and said fixed cylinder body the valve body is moved to open the valve and the compressed air is fed to said motor, and when said controlling rod is actuated to move said engaging ring out of said space anD interior of said movable cylinder body, said valve body is caused to move to close the valve.

Claim 15

A sander as claimed in claim 1, wherein said controlling rod is axially aligned with said movable valve body and abuts against one end thereof.

Claim 16

A sander as claimed in claim 11, wherein the compressed air fed to the sander applies a bias tending to move said movable valve body to the closed position and thereby tending to move said controlling rod forwardly to the position wherein said engaging ring engages the engaging groove of the fixed cylinder body.

Claim 17

A sander as claimed in claim 10, wherein said valve controlling mechanism includes a control knob mounted to said handle and coupled to the end of said controlling rod remote from said movable valve body, said control knob being operable with only one hand of the operator of the sander.

Claim 18

A sander as claimed in claim 1, wherein said elongated projecting leg extends along substantially the whole length of one portion of said sanding table.

Claim 19

A sander as claimed in claim 1, wherein said sanding table is non-resiliently and directly secured to the underside of said motor.

Claim 20

A portable sander comprising: a motor, said motor comprising a circulator, at least one circulating member in the circulator and a compressed air inlet to the circulator to admit compressed air for circulating said at least one circulating member in the circulator at a high speed to generate continuous rotational vibration by the centrifugal force of said at least one circulating member; a sanding table for carrying an abrasive material, said sanding table being rigidly secured to the underside of said motor; a handle; and at least one resilient waisted support leg resiliently mounting said handle to the upper side of said motor, each waisted support leg including upper and lower portions, a pair of metal cores, said metal cores being respectively embedded in said upper and lower portions of the support leg, upper and lower end surfaces of the support leg comprising large face fixing portions, and wherein a concave track is provided on the handle and a concave track is provided on the motor, said large face fixing portions being secured to respective concave tracks by fixing bolts engaging in the metal cores.

Claim 21

A portable sander comprising: a motor, said motor comprising a circulator, at least one circulating member in the circulator and a compressed air inlet to the circulator to admit compressed air for circulating said at least one circulating member in the circulator at a high speed to generate continuous rotational vibration by the centrifugal force of said at least one circulating member; a sanding table for carrying an abrasive material, said sanding table being rigidly secured to the underside of said motor; a handle; and at least one resilient waisted support leg resiliently mounting said handle to the upper side of said motor, each waisted support leg including upper and lower portions, a pair of metal cores, said metal cores being respectively embedded in said upper and lower portions of the support leg, upper and lower end surfaces of the support leg comprising large face fixing portions, and wherein a concave track is provided on the handle and a concave track is provided on the motor, said large face fixing portions being secured to respective concave tracks by fixing bolts engaging in the metal cores.