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Патент USA US3027702

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April 3, 1962
A. FIELD
ABRADING IMPLEMENT
Filed 001;. ‘7', 1960
3,027,692
ire Slit-ates atent
1
3,027,692
Albert Field, 1706 Salem Ave., Dayton, Ohio
ABRADING IMPLEMENT
Filed Oct. 7, 1960, Ser. No. 61,116
15 Claims. ((31. 51-190)
This invention relates to abrading implements, and par
ticularly to drum sanders wherein a cylindrical band made
of an abrasive coated fabric is installed on a rotary
3,927,592
Patented Apr. 3, 1962
2
to peripheral portion 19, the disc 22 having its peripheral
edge turned inward to de?ne a projecting ?ange 23 engag
ing 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 assem
bly 24 which includes a nut 25 having a threaded mount
ing on the stud 16. Further comprised in the assembly
24 is a cylindrical body 26 made of a resilient material
mandrel for internal sanding and ?nishing operations. 10 like the material of body portion 18 and corresponding in
While not so limited the invention has especial reference
its outside diameter to the diameter of member 17. The
to machine mounted implements wherein the work is
members 17 and 24 are in end to end relation upon the
brought to the tool rather than the tool to the work.
mandrel 11, and, with their adjacent faces or ends in con
Devices of the kind of which the instant invention re
tacting relation, present through their joint peripheries a
lates hold the abrasive coated hand through the applica 15 continuous elongated exterior bearing surface.
tion of outwardly directed forces of expansion, and it is
The body 26 is formed with a longitudinal through
an objective in the design of such devices to enable these
cylindrical bore 27, and, in its outer face a counter-bore
forces to be readily released and reapplied in order that
28 having a polygonal con?guration. The nut 25 has a
worn bands may quickly and easily be removed and
cylindrical portion 29 matching and adapted to be re
replaced.
20 ceived in bore 27 as well as an enlarged polygonal por
An object of the instant invention is to achieve design
tion 31 adapted to be received in and inter?t with the non
improvement in this respect, lending the concept of simpli
circular counter-bore 28. Still further in the outer end
?ed band installation and replacement to relatively large
or face of the body 26 is a broad recess 32 receiving an
drum sanders of the machine mounted type.
other back-up disc or pressure plate 33 which is integrally
Another object of the invention is to effect improvement 25 formed with or otherwise secured to the nut 25.
in the safety characteristics of devices as described, par
The construction and arrangement of parts accordingly
ticularly in respect of the obviating of projecting portions
is one placing the cylindrical members 17 and 24 in end
of the rotary mandrel, it being contemplated that the
to end relatively rotatable relation upon the mandrel 11.
operating controls for tightening and releasing a band
In response to a gripping and ttuning of the cylindrical
upon the mandrel be comprised wholely within the dimen 30 member 24 the nut 25 forming a part thereof rotates
sions of the band.
upon the threaded stud 16 and so effects an axial motion
Other objects and structural details of the invention will
of the member 24 toward or away from the member 17.
appear from the following description when read in con
In response to motion effecting an approach of the mem
nection with the accompanying drawing, wherein:
ber 24 to the member 17, body 26 contacts the body 18—
FIG. 1 is a view in exploded perspective of a drum 35 19, and, as such motion is continued, e?ects a longitudinal
sander in accordance with the illustrated embodiment of
compression of the material of these bodies as it is clamp
the invention;
ingly engaged between the back-up disc 22 and the pres~
FIG. 2 is a view in longitudinal section of an assembled
sure plate 33. In response thereto the cylindrical bearing
device as shown in FIG. 1;
surface at the exterior of the device expands, the periph
40
FIG. 3 is a detail view in front elevation of an adjust
eral portion 19 of the member 17 providing quick response
ment nut comprised in the device; and
to the application of such longitudinal pressures. Con
FIG. 4 is a view like FIG. 3 showing a part which in
tinued application of such pressure may thrust the member
the assembly of the device occupies a companion inter
17 into full engagement with the back-up disc 22, and a
?tting relation to the part of FIG. 3.
limit to such motion is represented by the shoulder 15 on
Referring to the drawing, an abrading implement in 45 the mandrel 11 engageable by the nut 29..
accordance with the illustrated embodiment of the inven
In the use of the abrading implement the companion
tion 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
cylindrical members 17 and 2e are surrounded by a ?exible
band 34 made of a fabric or like material and coated with
an abrasive product. The band 34 is approximately co
overlaying such core body a peripheral body portion 19.
between the bodies 26 and 18——19 with a consequent ex
end of the latter is formed with a polygonal head 12 hav 50 extensive in length with the combined lengths of the
ing an axial threaded recess 13 receiving the correspond
members 17 and 24 and seats on the circular bearing sur
face provided by such members. In the installation of
ingly threaded end of the shaft 10 in such manner as
detachably to connect the unitary abrading implement to
the band, the cylindrical member 24 is backed oil or
the machine shaft for rotation thereby.
relatively retracted relatively to the member v17 so that
The mandrel 1.1 is formed over the greater part of its 55 the band may he slid freely to position upon the bearing
length with a cylindrical shank portion 14. This portion
surface. After it has been so positioned the body 26 is
grasped by the operator, the pressure of such grasp being
terminates in a shoulder 15 beyond which the mandrel
applied directly through the flexible band 34, and the
is formed with a reduced diameter projecting threaded
stud 16. Mounted on the shank portion 14 is a cylindrical
body is turned, along with the band. In response to
member 17 made up of a core body portion 18, and, 60 such motion, as noted, a pressural engagement is effected
pansion of at least a part of the peripheral bearing sur
face. This outward thrust applies a hoop tension to the
ing or like operation. Peripheral portion 19 is, however, 65 band 34 in such manner as frictionally to hold it to the
mandrel and parts mounted thereon. In this connection
differentiated from the body portion 18 by being made of
it will be observed that the body 26 of member 24 has a
a softer more readily deformable material. A liner 21
positive driving connection with the mandrel 11 and in
protects the material of the member 17 from direct con
turn is frictionally engaged with the member 17 in re
tact with the mandrel 11. Interposed between the cylin
sponse to its movement locking up the band 34 thereon.
drical member 17 and the head 12 of the mandrel 11 is 70 Accordingly both assemblies 17 and 24 rotate in unison
a disc 22 performing a back-up or reactant function in
with the mandrel 11. The drive through the mandrel to
The body 18 and portion 19 are made of resilient ma
terials and are united with one another by a suitable bond
connection with member 17, and particularly with respect
the rotating bodies thereon is, moreover, entirely con
3,027,692
3
ill
tained within the dimensions of the band 34, as is the
control whereby the band alternately is locked to and re
leased from the mandrel. No projections at the outer
end of the mandrel or of the abrading implement, which
one end of said member mounted on said mandrel to form
a part thereof and having an inwardly directed ?ange
may present safety hazards, are required.
drical member and movable longitudinally thereof to
aligned with said peripheral portion of softer material,
and means mounted on said mandrel beyond said cylin
apply to said member in conjunction with said back-up
What is claimed is:
means and endwise clamping pressure expanding radially
1. An abrading implement, including a pair of cylin
outward the peripheral portion thereof.
drical members in end to end relation, the peripheries of
8. An abrading implement according to claim 7, char
said members combining to form a longitudinally elon
gated circular bearing surface, an abrasive coated band 10 acterized in that said last named means includes a cylin
drical body adapted to make a ?ush end to end contact
in surrounding contacting relation to said bearing sur
with said cylindrical member and having a periphery
face, a mandrel serving as an axial support for said
aligned with and serving as an extension of the periphery
members, one of said members having a screw threaded
of said cylindrical member, said peripheries cooperating
connection with said mandrel to apply a longitudinal
thrust to the other member in response to rotation of said 15 to form a circular bearing surface which is at least in
one member on said mandrel in one direction, and means
part radially expansible.
9. An abrading implement according to claim 7, char
for limiting longitudinal motion of the other one of said
acterized in that said last named means includes an as
members in response to such thrust, the peripheral por
sembly comprising a nut in screw threaded engagement
tion of at least one of said members being made of a
resilient deformable material compressed by thrust en~ 20 with said mandrel and a body made of a resilient mate
rial and non-rotatably mounted on said nut, said body hav
gagement of said members to expand at least a portion
ing a diameter equal to that of said cylindrical member
of said bearing surface into tighter ?tting contact with
and making a flush end to end engagement with said cylin
the abrasive coated band.
2. An abrading implement, including a pair of cylin
drical member, the periphery of the body comprised in
drical members in end to end relation, 21 mandrel serving 25 said assembly presenting a gripping area for manual
as an axial support for said members, means on said
mandrel limiting longitudinal motion of one of said mem
bers 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 conjunc 30
turning of the assembly comprising said body and said
not and further de?ning a continuation of the periphery
of said cylindrical member to de?ne therewith an elon
gated circular bearing surface.
10. An abrading implement according to claim 9, char
tion with said limiting means an endwise clamping of said
one member, a peripheral portion of said one member
acterized by means on said mandrel engageable by said
nut to limit the extent of relative rotary motion of said
being made of a resilient deformable material expanding
under such clamping pressure, and the periphery of said
assembly in one direction.
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 rela
tively rotatable cylindrical members in end to end rela
cylindrical member on said mandrel having a body formed
of a resilient material, and having inner and outer ends,
tion, 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 sup
port for said members and a backing for one end of one
ll. An ‘abrading implement, including a mandrel, a
back-up means on said mandrel for the inner end of
cylindrical member, another cylindrical member on
mandrel in a position of alignment with the ?rst
member and having an inner end facing the outer
said
said
said
end
of the ?rst 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 re
of said members, the other member being in threaded en~ 45 lation to the outer end of said other cylindrical member,
said other cylindrical member being made of a resilient
gagement with said support and rotatable to apply and
10 release a clamping pressure to the opposite end of said
material ‘and having a diameter equal to that of the ?rst
one member whereby selectively to expand said bearing
said cylindrical member to de?ne therewith a substan
surface in the region of said resilient deformable mate
tially continuous circular bearing surface caused selec
rial.
tively to expand and to contract by a manual grasping of
4. An abrading implement according to claim 3, char
said other cylindrical member and rotating it upon said
acterized in that said one member is long in relation to
mandrel into and out of endwise clamping engagement
said other member and formed with said resilient deform
with the ?rst said cylindrical member.
able bearing portion, said other member being adjacent
12. An abrading implement according to claim 11,
to said one member and rotated by a manual grasp of its 55 characterized by means on said mandrel cooperating with
exterior.
5. An abrading implement according to claim 3, char
said not to limit relative rotary motion of said other cy
lindrical member in one direction.
acterized by a ?exible abrasive coated band in surrounding
13. An abrading implement, including a mandrel, a
contacting relation to said bearing surface and tightened
nut threaded on said mandrel and having a radially pro
thereon by expansion of said surfaces, the exterior of 60 jecting pressure plate, a reactant disc on said mandrel in
said other member being adapted to be gripped through
longitudinal spaced relation to said pressure plate, and a
said band for rotation.
two part body of resilient deformable material mounted
6. An abrading implement according to claim 3, char
on said mandrel between said pressure plate and said disc,
acterized in that said other member is comprised of a
one part of said body being connected to said nut for
nut in screw threaded engagement with said support, a 65 unison rotation whereby relative rotary motion of said
ring made of resilient material installed on said nut for
one part in one direction completes a rotary drive from
relative longitudinal and unison rotary motions and a
said mandrel through both parts of said body and radial
?ange integral with said nut in backing relation to one
ly expands said body.
end of said ring the other end of the ring extending into
14. An abrading implement according to claim 13,
contacting relation to said one member and the periphery 70 characterized in that said one part of said body occupies
forming a part of said bearing surface.
a complementary position to the other part to form an
7. An abrading implement, including a mandrel, a
abrasive band support and presents a relatively large pe
cylindrical member on said mandrel havin0 a body formed
ripheral surface for the grasp of the operator for turning
of a resilient material and a peripheral portion formed of
motion as described.
another and softer resilient material, a back-up means for
15. An abrading implement, including a pair of body,
3,027,692
members in end to end relation, said members being circu
lar in cross-section and their peripheries being continua
tions 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 en
gagement 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 man 10
drel to cause said one body member to advance on the
other said body member, and means for limiting move
6
ment of said other body member under thrust engage
ment 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 ?tting contact with
the abrasive coated band.
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,892,292
Whitney _____________ __ June 30, 1959
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