IBM Technical Disclosure Bulletin (TDB 01-78 p3022-3023)
English (United States)
2 pages / 73.6 KB
This tubing stretcher is particularly useful for stretching open the end of small-bore plastic tubing as uniformly and distortion-free as possible. After stretching the end of the tubing, it can be slipped over a mating part before it relaxes to its original shape. The jaw design enables the tube to slide over the four upright segments of the jaws and establish a depth of stretch as it rests against the bottom radius of the jaws. There is no need to manipulate the tube further.
As shown in Fig. 1, the power for the opening of the jaws is derived from a foot pedal controlled air cylinder 3 attached to a cam follower plate 5. As the cam follower plate rotates, the cam followers 7 apply pressure against the spreader arms 9 which pivot on studs 11, forcing the jaws 13 to move outward from center. This travel of the cam follower plate 5 is limited by a stationary stop 15 secured to the base plate 16. When the foot pedal is released, the air cylinder 3 retracts, allowing the spreader arms to return to the closed position with the help of compression springs 17.
As seen in Fig. 2, each of the jaws 13 has an upstanding portion, and when closed, form an upright mandrel over which the end of the tubing is slipped.
The entire mechanism is covered by a plate (not shown) with only an access hole for the spreader jaws.