US3027692A

US3027692A - Abrading implement

Info

Publication number: US3027692A
Application number: US61116A
Authority: US
Inventors: Field Albert
Original assignee: Individual
Current assignee: Individual
Priority date: 1960-10-07
Filing date: 1960-10-07
Publication date: 1962-04-03
Anticipated expiration: 1979-04-03

Description

April 3, 1962 A. FIELD 3,027,692

ABRADING IMPLEMENT Filed 001;. 7', 1960 3,027,692 ABRADING IMPLEMENT Albert Field, 1706 Salem Ave., Dayton, Ohio Filed Oct. 7, 1960, Ser. No. 61,116 15 Claims. ((31. 51-190) This invention relates to abrading implements, and particularly to drum sanders wherein a cylindrical band made of an abrasive coated fabric is installed on a rotary mandrel for internal sanding and finishing operations. While not so limited the invention has especial reference to machine mounted implements wherein the work is brought to the tool rather than the tool to the work.

Devices of the kind of which the instant invention relates hold the abrasive coated hand through the application of outwardly directed forces of expansion, and it is an objective in the design of such devices to enable these forces to be readily released and reapplied in order that worn bands may quickly and easily be removed and replaced.

An object of the instant invention is to achieve design improvement in this respect, lending the concept of simplified band installation and replacement to relatively large drum sanders of the machine mounted type.

Another object of the invention is to effect improvement in the safety characteristics of devices as described, particularly in respect of the obviating of projecting portions of the rotary mandrel, it being contemplated that the operating controls for tightening and releasing a band upon the mandrel be comprised wholely within the dimensions of the band.

Other objects and structural details of the invention will appear from the following description when read in connection with the accompanying drawing, wherein:

FIG. 1 is a view in exploded perspective of a drum sander in accordance with the illustrated embodiment of the invention;

FIG. 2 is a view in longitudinal section of an assembled device as shown in FIG. 1;

FIG. 3 is a detail view in front elevation of an adjustment nut comprised in the device; and

FIG. 4 is a view like FIG. 3 showing a part which in the assembly of the device occupies a companion interfitting relation to the part of FIG. 3.

Referring to the drawing, an abrading implement in accordance with the illustrated embodiment of the invention is adapted for installation upon the outer end of a machine driven shaft 10. It has a unitary structural character, the principal support being a mandrel 11. One end of the latter is formed with a polygonal head 12 having an axial threaded recess 13 receiving the correspondingly threaded end of the shaft in such manner as detachably to connect the unitary abrading implement to the machine shaft for rotation thereby.

The mandrel 1 1 is formed over the greater part of its length with a cylindrical shank portion 14. This portion terminates in a shoulder 15 beyond which the mandrel is formed with a reduced diameter projecting threaded stud 16. Mounted on the shank portion 14 is a cylindrical member 17 made up of a core body portion 18, and, overlaying such core body a peripheral body portion 19. The body 18 and portion 19 are made of resilient materials and are united with one another by a suitable bonding or like operation. Peripheral portion 19 is, however, differentiated from the body portion 18 by being made of a softer more readily deformable material. A liner 21 protects the material of the member 17 from direct contact with the mandrel 11. Interposed between the cylindrical member 17 and the head 12 of the mandrel 11 is a disc 22 performing a back-up or reactant function in connection with member 17, and particularly with respect ire S it-ates atent to peripheral portion 19, the disc 22 having its peripheral edge turned inward to define a projecting flange 23 engaging the peripheral portion 19 and holding the body 18 normally spaced from the back-up disc.

Beyond the cylindrical member 17, on the mandrel 11, is a companion and mating cylindrical member or assembly 24 which includes a nut 25 having a threaded mounting on the stud 16. Further comprised in the assembly 24 is a cylindrical body 26 made of a resilient material like the material of body portion 18 and corresponding in its outside diameter to the diameter of member 17. The

members

17 and 24 are in end to end relation upon the mandrel 11, and, with their adjacent faces or ends in contacting relation, present through their joint peripheries a continuous elongated exterior bearing surface.

The body 26 is formed with a longitudinal through cylindrical bore 27, and, in its outer face a counter-bore 28 having a polygonal configuration. The nut 25 has a cylindrical portion 29 matching and adapted to be received in bore 27 as well as an enlarged polygonal portion 31 adapted to be received in and interfit with the noncircular counter-bore 28. Still further in the outer end or face of the body 26 is a broad recess 32 receiving another back-up disc or pressure plate 33 which is integrally formed with or otherwise secured to the nut 25.

The construction and arrangement of parts accordingly is one placing the

cylindrical members

17 and 24 in end to end relatively rotatable relation upon the mandrel 11. In response to a gripping and ttuning of the cylindrical member 24 the nut 25 forming a part thereof rotates upon the threaded stud 16 and so effects an axial motion of the member 24 toward or away from the member 17. In response to motion effecting an approach of the member 24 to the member 17, body 26 contacts the body 18- 19, and, as such motion is continued, efiects a longitudinal compression of the material of these bodies as it is clampingly engaged between the back-up disc 22 and the pressure plate 33. In response thereto the cylindrical bearing surface at the exterior of the device expands, the peripheral portion 19 of the member 17 providing quick response to the application of such longitudinal pressures. Continued application of such pressure may thrust the member 17 into full engagement with the back-up disc 22, and a limit to such motion is represented by the shoulder 15 on the mandrel 11 engageable by the nut 29..

In the use of the abrading implement the companion cylindrical members 17 and 2e are surrounded by a flexible band 34 made of a fabric or like material and coated with an abrasive product. The band 34 is approximately coextensive in length with the combined lengths of the

members

17 and 24 and seats on the circular bearing surface provided by such members. In the installation of the band, the cylindrical member 24 is backed oil or relatively retracted relatively to the member 17 so that the band may he slid freely to position upon the bearing surface. After it has been so positioned the body 26 is grasped by the operator, the pressure of such grasp being applied directly through the flexible band 34, and the body is turned, along with the band. In response to such motion, as noted, a pressural engagement is effected between the bodies 26 and 1819 with a consequent expansion of at least a part of the peripheral bearing surface. This outward thrust applies a hoop tension to the band 34 in such manner as frictionally to hold it to the mandrel and parts mounted thereon. In this connection it will be observed that the body 26 of member 24 has a positive driving connection with the mandrel 11 and in turn is frictionally engaged with the member 17 in response to its movement locking up the band 34 thereon. Accordingly both assemblies 17 and 24 rotate in unison with the mandrel 11. The drive through the mandrel to the rotating bodies thereon is, moreover, entirely contained within the dimensions of the band 34, as is the control whereby the band alternately is locked to and released from the mandrel. No projections at the outer end of the mandrel or of the abrading implement, which may present safety hazards, are required.

What is claimed is:

1. An abrading implement, including a pair of cylindrical members in end to end relation, the peripheries of said members combining to form a longitudinally elongated circular bearing surface, an abrasive coated band in surrounding contacting relation to said bearing surface, a mandrel serving as an axial support for said members, one of said members having a screw threaded connection with said mandrel to apply a longitudinal thrust to the other member in response to rotation of said one member on said mandrel in one direction, and means for limiting longitudinal motion of the other one of said members in response to such thrust, the peripheral portion of at least one of said members being made of a resilient deformable material compressed by thrust engagement of said members to expand at least a portion of said bearing surface into tighter fitting contact with the abrasive coated band.

2. An abrading implement, including a pair of cylindrical members in end to end relation, 21 mandrel serving as an axial support for said members, means on said mandrel limiting longitudinal motion of one of said members in one direction, a threaded connection between said mandrel and the other one of said members, said one member being rotatably adjustable to effect in conjunction with said limiting means an endwise clamping of said one member, a peripheral portion of said one member being made of a resilient deformable material expanding under such clamping pressure, and the periphery of said other member combining with the periphery of said one member to form an abrasive band bearing surface.

3. An abrading implement, including a pair of relatively rotatable cylindrical members in end to end relation, said members being of substantially equal diameter to present on their exteriors a longitudinally elongated circular bearing surface, at least one of said members having its exterior bearing portion formed of a resilient deformable material, and means providing a common support for said members and a backing for one end of one of said members, the other member being in threaded engagement with said support and rotatable to apply and 10 release a clamping pressure to the opposite end of said one member whereby selectively to expand said bearing surface in the region of said resilient deformable material.

4. An abrading implement according to claim 3, characterized in that said one member is long in relation to said other member and formed with said resilient deformable bearing portion, said other member being adjacent to said one member and rotated by a manual grasp of its exterior.

5. An abrading implement according to claim 3, characterized by a flexible abrasive coated band in surrounding contacting relation to said bearing surface and tightened thereon by expansion of said surfaces, the exterior of said other member being adapted to be gripped through said band for rotation.

6. An abrading implement according to claim 3, characterized in that said other member is comprised of a nut in screw threaded engagement with said support, a ring made of resilient material installed on said nut for relative longitudinal and unison rotary motions and a flange integral with said nut in backing relation to one end of said ring the other end of the ring extending into contacting relation to said one member and the periphery forming a part of said bearing surface.

7. An abrading implement, including a mandrel, a cylindrical member on said mandrel havin a body formed of a resilient material and a peripheral portion formed of another and softer resilient material, a back-up means for one end of said member mounted on said mandrel to form a part thereof and having an inwardly directed flange aligned with said peripheral portion of softer material, and means mounted on said mandrel beyond said cylindrical member and movable longitudinally thereof to apply to said member in conjunction with said back-up means and endwise clamping pressure expanding radially outward the peripheral portion thereof.

8. An abrading implement according to claim 7, characterized in that said last named means includes a cylindrical body adapted to make a flush end to end contact with said cylindrical member and having a periphery aligned with and serving as an extension of the periphery of said cylindrical member, said peripheries cooperating to form a circular bearing surface which is at least in part radially expansible.

9. An abrading implement according to claim 7, characterized in that said last named means includes an assembly comprising a nut in screw threaded engagement with said mandrel and a body made of a resilient material and non-rotatably mounted on said nut, said body having a diameter equal to that of said cylindrical member and making a flush end to end engagement with said cylindrical member, the periphery of the body comprised in said assembly presenting a gripping area for manual turning of the assembly comprising said body and said not and further defining a continuation of the periphery of said cylindrical member to define therewith an elongated circular bearing surface.

10. An abrading implement according to claim 9, characterized by means on said mandrel engageable by said nut to limit the extent of relative rotary motion of said assembly in one direction.

ll. An abrading implement, including a mandrel, a cylindrical member on said mandrel having a body formed of a resilient material, and having inner and outer ends, back-up means on said mandrel for the inner end of said cylindrical member, another cylindrical member on said mandrel in a position of alignment with the first said member and having an inner end facing the outer end of the first said cylindrical member, a nut in screw threaded engagement with said mandrel and mounting said other cylindrical member for unison rotation, said not having an integral portion extending in back-up relation to the outer end of said other cylindrical member, said other cylindrical member being made of a resilient material and having a diameter equal to that of the first said cylindrical member to define therewith a substantially continuous circular bearing surface caused selectively to expand and to contract by a manual grasping of said other cylindrical member and rotating it upon said mandrel into and out of endwise clamping engagement with the first said cylindrical member.

12. An abrading implement according to claim 11, characterized by means on said mandrel cooperating with said not to limit relative rotary motion of said other cylindrical member in one direction.

13. An abrading implement, including a mandrel, a nut threaded on said mandrel and having a radially projecting pressure plate, a reactant disc on said mandrel in longitudinal spaced relation to said pressure plate, and a two part body of resilient deformable material mounted on said mandrel between said pressure plate and said disc, one part of said body being connected to said nut for unison rotation whereby relative rotary motion of said one part in one direction completes a rotary drive from said mandrel through both parts of said body and radially expands said body.

14. An abrading implement according to claim 13, characterized in that said one part of said body occupies a complementary position to the other part to form an abrasive band support and presents a relatively large peripheral surface for the grasp of the operator for turning motion as described.

15. An abrading implement, including a pair of body members in end to end relation, said members being circular in cross-section and their peripheries being continuations of one another to form a longitudinally elongated bearing surface, an abrasive coated band in surrounding contacting relation to said bearing surface, a mandrel serving as an axial support for said body members, a nut rotatably mounted on said mandrel in threaded engagement therewith and connected to one of said body members for unison rotation, rotation of said one body member in one direction turning said nut on said mandrel to cause said one body member to advance on the other said body member, and means for limiting movement of said other body member under thrust engagement by said one body member, at least a part of said longitudinally elongated bearing surface being comprised of a resilient deformable material compressed by thrust engagement of said members to expand at least a portion of said bearing surface into tighter fitting contact with the abrasive coated band.

References Cited in the file of this patent UNITED STATES PATENTS 2,892,292 Whitney June 30, 1959