Metal working – Plural diverse manufacturing apparatus including means for... – With means to feed work intermittently from one tool station...
Reexamination Certificate
1999-08-23
2001-01-30
Briggs, William (Department: 3722)
Metal working
Plural diverse manufacturing apparatus including means for...
With means to feed work intermittently from one tool station...
C029S564000, C409S251000, C409S259000
Reexamination Certificate
active
06178616
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a circulating type milling apparatus for milling the keyway of a lock core at high speed.
2. Description of the Related Art
Taiwan Utility Model Publication No. 37696, entitled “AUTOMATIC MILLING DEVICE FOR LOCK CORES” and issued on Jun. 1, 1981, discloses a reciprocating cutter mounted on a movable base, a key being provided on the base for activating a control rod and a control arm for automatically urging a lock core to fall into a milling seat and thus be milled to form a keyway.
Taiwan Utility Model Publication No. 44973, entitled “MILLING DEVICE FOR LOCK CORES” and issued on Jul. 1, 1982, discloses a base with a cutter seat to which a cutter is mounted, and a motor is provided for driving a chain wheel. A milling seat frame and a milling seat are carried by a chain and thus conveyed along the conveying direction such that a lock core in the milling seat is milled by the cutter on the base to form a keyway.
It is, however, found that the milling speeds of the milling devices discloses in the above two disclosures are relatively low, only 3-4 lock cores are milled per minute. In addition, the whole cutter must be replaced if a small portion of the cutter is damaged, which is not economical.
Taiwan Utility Model Publication No. 300181, entitled “REVOLVER TYPE MILLING DEVICE FOR LOCK CORES” and issued on Mar. 11, 1997, discloses a frame with a revolver disc rotatably supported by a bearing and having posts for a working table that is moved vertically by a cylinder means. The revolver disc is attached to a shaft that is rotatably held by the bearing. A bevel gear is intermittently driven to cause the revolver disc to travel through a certain angle at regular time. A number of seats are mounted on the revolver disc for holding lock cores. When the working table is moved by the cylinder means, cutters on the working table mill the lock cores on the revolver disc in response to reciprocating movements of the posts of the frame, and the milling procedure on each lock core is continued when the revolver disc is rotated to next angular position to finally form a keyway on each lock core. It is, however, found that a tooth space difference exists when the lock core is turned, as the bevel gear is intermittently driven. Accordingly, the keyway formed by milling has a larger tolerance, resulting in lock cores with unreliable quality.
The present invention is intended to provide a circulating type milling apparatus for milling a lock core keyway that mitigates and/or obviates the above problems.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide a circulating type milling apparatus for precisely and rapidly milling a lock core keyway for each lock core.
A circulating type milling apparatus for milling a lock core keyway in accordance with the present invention comprises a frame with a rotating disc that is rotated through a predetermined angle. Lock core seats are provided on the rotating disc. Lock cores are filled into the lock core seats one by one and then milled by cutters that are mounted to a vertically movable milling disc, which, in turn, is actuated by, e.g., a hydraulic cylinder. The cutters are guided downward by tracks arranged on an annular fixed wall for simultaneously milling the lock cores. When a lower sensor detects that the cutters are moved downward and thus disengaged from the lock cores, the rotating disc is rotated by a distance that is equal to a half distance between two adjacent lock core seats such that each lock core seat is in a positioning in alignment with a detector. When the milling disc is moved upward, the detector checks whether the milled keyway of the lock core meets the required standard. If a cutter fails to mill the keyway to the required standard as a result of wear, the detector sends a signal to stop the whole milling apparatus for replacing the cutter. When an upper sensor detects that the milling disc is moved upward to a preset position, the detector disengages from the lock core seat, and the rotating disc is rotated again by a distance that is equal to a half distance between two adjacent lock core seats for next milling. Milling of the lock core is finished when the rotating disc is rotated through 360°, and the milled lock core is ejected by an ejecting plate.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 2343420 (1944-03-01), Podesta
patent: 2893293 (1959-07-01), Poynter
patent: 3799030 (1974-03-01), Schubert
patent: 4432130 (1984-02-01), Gabriele
patent: 5326201 (1994-07-01), King
patent: 37696 (1981-06-01), None
patent: 44973 (1982-07-01), None
patent: 300181 (1997-03-01), None
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