Cutlery – Combined cutlery or combined with ancillary feature – With material-holder or disposal
Reexamination Certificate
1999-07-06
2001-03-20
Watts, Douglas D. (Department: 3724)
Cutlery
Combined cutlery or combined with ancillary feature
With material-holder or disposal
C241S101720, C411S531000
Reexamination Certificate
active
06202308
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a heavy-duty shear which is adapted to be attached to a backhoe and, more particularly, the present invention relates to a metal cutting shear with inner plow bolt supports for indexable blade inserts.
2. Background Information
Heavy-duty metal cutting shears of the type that are mounted on backhoes and powered by hydraulic cylinders for efficiently handling scrap are well-known in the art. Examples of these types of shears can be found in U.S. Pat. Nos. 4,403,431; 4,450,625; 4,519,135; 4,670,983; 4,686,767; 4,897,921; and 5,197,193. These heavy-duty shears are designed for efficient handling and shearing of scrap, generally metal scrap, into usable sizes. For example, in dismantling an industrial building, metal scraps in the form of pipes of various diameters and lengths, structural beams, such as I-beams, channels, angles and the like, sheet metal and sheet metal plate must all be efficiently handled and severed by the metal cutting shears. The metal cutting shears are additionally utilized for reducing automobile and truck frames, railroad cars and the like.
These prior art metal cutting shears typically use replaceable blade inserts having at least one cutting edge thereon. When the cutting edge of the blade is worn, the blade inserts can be removed and sharpened or replaced. U.S. Pat. No. 4,897,921 discloses the use of reversible, indexable blade inserts wherein each blade insert has multiple cutting edges thereon which can be indexed to the appropriate operative position. U.S. Pat. No. 5,197,193 discloses similar reversible blade inserts having multiple cutting edges. Typically, the blade inserts of the prior art are held in position by one or more plow bolts extending therethrough into the anvil portion of the fixed or movable blade of the shear. The blade insert is provided with a recessed portion to receive the head of the plow bolt. This attaching arrangement provides some difficulties in reversible blade inserts which are flipped to provide new cutting edges such as in U.S. Pat. Nos. 4,897,921 and 5,197,193 discussed above. These deficiencies can be clarified by reviewing the typical prior art blade insert attachment illustrated in FIG.
1
. The reversible, indexable blade insert
10
includes at least one central bore
12
extending therethrough with a pair of generally frustoconically-shaped recesses
14
and
15
at opposite ends of the central bore
12
. Each recess
14
and
15
has a shape corresponding to a bolt head
16
of a plow bolt
18
. The outwardly facing recess
15
is adapted to receive the bolt head
16
of the plow bolt
18
therein as shown in FIG.
1
. The threaded end
19
of the plow bolt
18
opposite the bolt head
16
receives a nut
20
in an anvil recess
21
to secure the blade insert
10
within an insert seat
22
of an anvil
24
of the fixed or movable blade of the shear. The inwardly facing recess
14
butts up against the anvil
24
in the insert seat
22
. The inwardly facing recess
14
and the outwardly facing recess
15
will be reversed when the blade insert
10
is flipped over. The anvil
24
includes a bolt-receiving bore
25
extending from the insert seat
22
to the anvil recess
21
and is aligned with the central bore
12
to receive the plow bolt
18
therethrough. A high-collar lock washer
26
is also conventionally provided in the anvil recess
21
around the plow bolt
18
between the nut
20
and the anvil
24
. This prior art configuration results in a significant unsupported section
28
along the plow bolt
18
due to the inwardly facing recess
14
adjacent the anvil
24
. The unsupported section
28
is undesirable in view of the high cutting forces exerted on the blade insert
10
. Moreover, the unsupported section
28
increases the likelihood of mispositioning of the blade insert
10
within the seat
22
and increases the likelihood of the blade insert
10
pulling out from the seat
22
.
It is an object of the present invention to overcome the aforementioned drawbacks of the prior art. It is a further object of the present invention to provide an attachment assembly for a reversible, indexable blade insert which includes substantially complete support along the length of the plow bolts. Another object of the present invention is to provide a blade insert attachment assembly which positively locates the blade insert in the anvil seat and effectively increases the blade insert to the anvil surface area to help prevent blade insert pullout. A still further object is to provide a blade insert attachment assembly that can be partially disassembled when access to the reversible, indexable blade insert is obstructed by a jammed workpiece, a second anvil, or other matter.
SUMMARY OF THE INVENTION
A blade for a heavy-duty shear according to the present invention achieves the above objects. The shear blade of the present invention generally includes an anvil portion forming at least one blade insert seat, at least one anvil recess, and at least one bolt-receiving bore. The bolt-receiving bore extends from the blade insert seat to the anvil recess and preferably forms a support member seat. A reversible blade insert is mounted in each blade insert seat. Each blade insert has at least one central bore extending therethrough, aligned with a bolt-receiving bore of the anvil. Each central bore has opposing recesses at each end thereof. A rigid support member is at least partially received within the bolt-receiving bore and the recess of the reversible insert. A bolt extends through the rigid support member and into and through the central bore of the insert.
In one embodiment of the present invention, a head of the bolt is received within an outwardly facing recess of the blade insert. A support member is at least partially received within the inwardly facing recess of the blade insert and at least partially received within a support member seat positioned opposite the anvil recess and adjacent the inwardly facing recess of the blade insert. The support member may be provided with a forward portion which corresponds to the configuration of the recess of the blade insert. A rear portion of the support member may be substantially cylindrical and may be provided with an offset extending substantially perpendicular to the longitudinal length of the support member. The offset is positioned between the rear portion and the front portion of the support member. A shim pack positioned adjacent each support member within the support member seat may also be provided.
In a second embodiment of the present invention, a support member extends the length of the bolt-receiving bore, and may be seated in a support member seat formed by the bolt-receiving bore. A forward portion of the support member is at least partially received within the inwardly facing recess of the blade insert. The support member may be provided with a forward portion which corresponds to the configuration of the recess of the blade insert. A rear portion of the support member may be substantially cylindrical and may be provided with an offset extending substantially perpendicular to the longitudinal length of the support member. The rear portion of the support member may also be provided with tap fittings for receiving tap bolts. A shim pack positioned adjacent each support member within the anvil support member seat may also be provided. A bolt is received by the anvil recess and extends through the center recess of the rigid support member, with a head of the bolt adjacent the anvil recess. A threaded end of the bolt engages a threaded central bore portion of the blade insert.
The present invention additionally provides a heavy-duty shear which is adapted to be attached to a backhoe. The shear comprises a fixed blade, at least one reversible blade insert attached to the fixed blade, a movable blade pivotally attached to the fixed blade, and at least one reversible blade insert attached to the movable blade. The blade inserts of the movable blade cooperate with the blade i
Allied Gator Inc.
Watts Douglas D.
Webb Ziesenheim & Logsdon Orkin & Hanson, P.C.
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