Abrading – Frame or mount – Portable abrader
Reexamination Certificate
2002-07-23
2004-01-13
Hail, III, Joseph J. (Department: 3723)
Abrading
Frame or mount
Portable abrader
C451S508000, C451S509000, C451S510000, C451S511000, C451S521000
Reexamination Certificate
active
06676499
ABSTRACT:
TECHNICAL FIELD
This invention relates to the field of abrasive grinding devices, and in particular to abrasive disk/wheel mounting members.
BACKGROUND ART
Abrasive disks are often used in stock removal, typically in two steps. A large abrasive disk, with a firm backup pad, is used first for primary stock removal. A much smaller disk, with a softer more contouring backup pad, is then used for final stock removal and a finished surface appearance. The primary disk is relatively large, generally larger than about 5 inches in diameter; an exemplary, commercially available primary disk
100
is illustrated in FIG.
1
A. The primary disk is mounted to a drive unit (such as a handheld, air powered grinder, not illustrated) with a mounting bolt or a retaining nut which is either passed through a center-hole
102
in the primary disk
100
or affixed to a threaded bolt attached to the grinding machine and passed through the hole
102
. The hole
102
is typically surrounded by a bushing
104
or other reinforcement.
FIG. 1B
illustrates one type of retaining member
106
having an opening which has internal (female) threads
108
to engage with an externally threaded (male) rod.
FIG. 1C
illustrates an alternative retaining member
110
which has external threads
112
to engage with an internally threaded opening.
The secondary disk is smaller than the primary disk, generally from about 1.5 to about 3 inches in diameter; exemplary, commercially available secondary disks
202
,
212
and
222
are illustrated in
FIGS. 2A-2C
, respectively. A less commonly used secondary disk
232
is illustrated in FIG.
2
D. The secondary disks
202
,
212
,
222
and
232
mount to the drive unit in several possible ways. Each includes a mounting member
204
,
214
,
224
and
234
secured to the respective secondary disk
202
,
212
,
222
and
232
. The mounting member
204
of
FIG. 2A
includes an externally threaded bolt
206
secured within an opening of the mounting member
204
. The mounting member
214
of
FIG. 2B
includes an internally threaded opening
216
. The mounting member
224
of
FIG. 2C
includes an externally threaded rod
226
affixed thereto. And, the mounting member
234
of
FIG. 2D
includes two or more clips
236
affixed to the surface of the mounting member or formed as an integral part thereof.
Because of the different mounting schemes and the different sizes of the primary and secondary disks, primary and secondary disks are not directly interchangeable on the drive unit, nor are different secondary disks directly interchangeable. Therefore, in order to switch between two disks, an operator must remove a securing device, the mounted disk and the disk backup pad from a drive unit. The operator must then mount the subsequently larger/smaller backup pad and corresponding disk onto the drive unit and secure them.
FIG. 3A
is an exemplary prior art disk backup pad
302
to which the primary disk
100
may be mounted using an internally threaded mounting bolt
106
(
FIG. 1B
) to mate with an externally threaded rod
304
. Additionally, the secondary disk
212
may also be mounted to the backup pad
302
, again using the internally threaded mounting bolt
106
, if the diameter of the backup pad
302
corresponds to the diameter of the secondary disk.
FIG. 3B
is an exemplary prior art disk backup pad
306
to which the primary disk
100
may be mounted using an externally threaded mounting bolt
110
(FIG.
1
C). Additionally, the secondary disk
222
may also be mounted to the backup pad
306
, again using the externally threaded mounting bolt
110
, if the diameter of the backup pad
306
corresponds to the diameter of the secondary disk.
It would be desirable, therefore, to have a common disk mounting system suitable for use with both primary and secondary abrasive disks of various diameters and accommodating various mounting methods.
BRIEF SUMMARY OF THE INVENTION
An abrasive disk mounting system and a grinding system are provided. The mounting system permits both primary abrasive disks (typically having a diameter greater than about 5 inches) and secondary abrasive disks (typically having a diameter from about 1.5 inches to about 3 inches) to be mounted to the same backup pad and hub. Additionally, the mounting system permits abrasive disks to be secured with either a male or female threaded mounting member, or with clips or head caps, to be mounted to the same backup pad and hub. The grinding system permits an abrasive disk or a backup pad extension to be quickly and easily secured to a hub.
The grinding wheel mounting system of the present invention may be used with primary and secondary circular abrasive disks, the primary abrasive disks having diameters larger than the diameters of the secondary abrasive disks. The mounting system comprises a circular backup pad having a diameter approximately corresponding to a diameter of a secondary abrasive pad and having an opening centrally formed therein and a cylindrical hub secured within the opening of the backup pad. The hub comprises a first end having a first set of threads for securing the hub to a drive unit, and a second end having a face to which a grinding disk is mountable. The second end has a second set of threads internally formed therein, sized to receive male threads of a first type of mounting member to secure a grinding disk thereon, and a third set of externally formed threads, sized to receive female threads of a second type of mounting member to secure a grinding disk thereon.
The grinding system comprises a first abrasive disk having a plurality of equally angularly spaced head caps on a rear face thereof, a circular backup pad having a diameter approximately corresponding to a diameter of the first abrasive disk and having an opening centrally formed therein, and a cylindrical hub secured within the opening of the backup pad. The, hub comprises a first end having a first set of threads for securing the hub to a drive unit, and a second end having a plurality of equally angularly spaced recesses formed in the face sized and shaped to engage the head caps on the rear face of the first abrasive disk. Consequently, the first abrasive disk is mountable to the hub by causing the head caps to be engaged by the recesses in the second end of the hub.
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Hail III Joseph J.
McDonald Shantese
Swanson & Bratschun LLC
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