Cutting – Tool or tool with support – Joint or connection
Reexamination Certificate
1999-09-10
2001-03-27
Bray, W. Donald (Department: 3725)
Cutting
Tool or tool with support
Joint or connection
C083S140000, C083S628000, C083S633000
Reexamination Certificate
active
06205901
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a punch that is used for punching suitable material that has a main support that houses a sliding punch, and is used in connection with a bracket mounting a cam for moving the punch, which will swing out of the way so that the punch can be removed and replaced with another punch.
Various punches for forming holes in materials have been used, and usually the punch has to be changed or replaced with tools that will remove threaded punches, and dies or other tools for removal and replacement.
SUMMARY OF THE INVENTION
The present invention relates to a punch press that has a deep throat for receiving punchable materials, such as relatively thin plastics. The press has a frame comprising two arms, an upper one of which as shown mounts a punch and the other of which has a removable die mounted therein. The punch and die act along an operating axis that is perpendicular to the plane of the throat. The punch slides in a suitable bore in the upper arm, and is spring loaded away from the arm at the upper end. The punch is actuated through the use of a lever or bell crank mounting a cam that is mounted onto a swing bracket and operated with an operator, such as a manual lever or a fluid pressure cylinder. The swing bracket has plates on opposite sides of the upper press arm, and has stripper prongs extending down alongside the punch. The swing bracket is pivotally mounted on the upper arm as shown. The swing bracket mounts the cam on a pivot at an upper end of the swing bracket, that is above the pivot of the swing bracket to the upper arm. The swing bracket is held in its operable position with a backstop or latch that pivots down against a lug on the casting on the upper arm and when in working position prevent pivoting of the swing bracket under punching loads.
The swing bracket can be pivoted out of the way of the punch when the punch is to be removed by moving the back stop away from its supporting shoulder or lug, and pivoting the bracket rearwardly until the roller cam clears the path of the punch so the punch can be pulled out of its mounting to the upper arm. The die also is merely slid out of its mounting bore so it can be replaced at the same time the punch is replaced.
When a new punch has been inserted, the swing bracket is moved to its working position, and the back stop or latch drops down into its latched position under gravity. The cam can also be operated with a pneumatic cylinder as an option, or with a manual lever that will cause the roller cam to force the punch through the material and through the opening of the die.
REFERENCES:
patent: 165466 (1875-07-01), Baer
patent: 563098 (1896-06-01), Thompson
patent: 847167 (1907-03-01), Derry
patent: 939958 (1909-11-01), Koelsch
patent: 1360905 (1920-11-01), Dubois
patent: 1999057 (1935-04-01), Peterson et al.
patent: 3416397 (1968-12-01), Preston
patent: 3715947 (1973-02-01), Weisbeck et al.
patent: 3741056 (1973-06-01), Saladin
patent: 3779113 (1973-12-01), Jestin
patent: 5832798 (1998-11-01), Schneider et al.
Bray W. Donald
Tamarack Habilitation Technologies, Inc.
Westman Champlin & Kelly P.A.
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