Method and apparatus for winding and forming cooling coils

Patent 4085488 Issued on April 25, 1978. Estimated Expiration Date:

April 25, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

1802161

2510183

2514830

2697868

Inventors

Application

No. 733020 filed on 10/15/1976

US Classes:

29/33G, Radiator making29/33T, Work on tubes29/727, Including deforming means29/890.035, Cooling apparatus making, e.g., air conditioner, refrigerator72/217Work between movable tool and pivot (e.g., sweep-arm bender)

Examiners

Primary: Bilinsky, Z. R.

Attorney, Agent or Firm

Striker; Michael J.

International Class

B21D 053/06

Foreign Application Priority Data

1975-10-18 DT

Abstract

A method for forming cooling coils of successive layers of rectangular configuration, in which the front end of an elongated tube is threaded between rolls of a straightening apparatus and clamped onto the periphery of a rectangular table, whereafter the table is rotated about a central axis while the incoming tube shifted in direction of this axis, and while the tube upstream of the table is held in taught condition by the straightening apparatus so that the tube is wound into a coil of rectangular configuraton about the table. After a coil of predetermined length has thus been wound, the table is stopped, the tube cut between the straightening apparatus and the table and the cut rear end of the tube is also clamped to the table. Thereafter, the corner portions of all loops of the coil are simultaneously formed by stamping into outwardly bulging portions to thereby stretch the tube sections between the corner portions beyond the elastic limit of the tube material; and an apparatus for carrying out the aforementioned steps in automatic succession.