Method and an apparatus for fusing a sidewall fitting onto a...

Details Method and an apparatus for fusing a sidewall fitting onto a... Method and an apparatus for fusing a sidewall fitting onto a...

2000-09-07

2002-06-18

Sells, James (Department: 1734)

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

C156S296000, C156S499000, C156S538000

Reexamination Certificate

active

06406587

ABSTRACT:

REFERENCE TO MICROFICHE APPENDIX
This application is not referenced in any Microfiche Appendix.
BACKGROUND OF THE INVENTION
This invention relates to a method and an apparatus for fusing a plastic fitting to a plastic pipe. A typical means of attaching a thermoplastic component to a thermoplastic pipe is by heat fusion which means heating mating surfaces of a fitting and a portion of the exterior surface of a plastic pipe and while these surfaces are in molten states, joining the surface together under applied pressure and holding the pressure until the joined surface is cooled and are thereby fused to each other. Typically, the molten surfaces need to be held in juxtaposed positions for only a few seconds to cool to a solid state.
The basic concept of thermofusion of fittings to an exterior surface of a plastic pipe is well known. The method and apparatus herein are closely related to and constitute improvements on a sidewall applicator for heat fusion of a fitting to a plastic pipe as revealed in U.S. Pat. No. 5,505,811, which issued on Apr. 9, 1996. For further background information relating to methods and apparatus for fusing fittings to plastic pipe reference should be had to the following patents as well as to references cited in U.S. Pat. No. 5, 505 811.
U.S. Pat. No.
INVENTOR
TITLE
3,616,024
Windle
Method and Apparatus for
Welding Heat Sealable Pipes
3,743,566
Louthan et al.
Apparatus for Joining a
Plastic Fitting to a Plastic
Pipe
3,820,773
Aizawa
Apparatus for Feeding a
Workpiece into Cutting
Position on Cutting Device
3,966,528
Christie
Apparatus and Method for
Joining a Branching Fitting to
a Pipe
4,092,205
Mieszczak
Machine for Installing Tees
4,338,712
Dearman
Welding Fixture for Use in
Joining Two Tubular
Members
4,445,677
Hansen et al.
Clamping Apparatus for
Plastic Pipe
4,533,424
McElroy
Pipe Fusion Apparatus with
Load Cell for Attaching Side
Wall Fittings
4,542,892
Goldner
Poly-Pipe Fusion Machine
4,556,207
Thompson et al.
Clamping Apparatus for
Plastic Pipe
4,894,521
Evans
Electric Heating Element for
Fusing Thermoplastic
Materials
4,957,570
Jenkins et al.
Butt-Welding of Pipes
5,505,811
Welch et al.
Sidewall Applicator for Heat
Fusion of a Fitting to a Plastic
Pipe
BRIEF SUMMARY OF THE INVENTION
This invention relates to an apparatus for fusing a plastic fitting to a plastic pipe.
The applicator of this invention includes spaced apart support shafts each having a lower end secured to the exterior of a plastic pipe so that the support shafts are in a common plane, normally a vertical plane, the plane including the axis of the plastic pipe. A housing is affixed on upper ends of the two support shafts. A vertical main shaft extends from the housing in the direction towards the pipe.
A transverse load cell is mechanically connected to the lower end of the main shaft and guided by the support shafts. A mechanically actuated brake is contained within the housing that releasable engages the main shaft, thus controlling the vertical position of the load cell.
The transverse load cell houses a hydraulically displaceable force shaft that telescopically extends downwardly from the load cell. A fitting holder is secured to the lower end of the force shaft. A hydraulic force generator in the load cell, operated by a hand wheel, provides hydraulic force to downwardly displace the force shaft so that a fitting, retained by the fitting holder, can be pressed against the exterior of the plastic pipe.


REFERENCES:
patent: 3616024 (1971-10-01), Windle
patent: 3743566 (1973-07-01), Louthan et al.
patent: 3820773 (1974-06-01), Aizawa
patent: 3966528 (1976-06-01), Christie
patent: 4092205 (1978-05-01), Mieszczak
patent: 4338712 (1982-07-01), Dearman
patent: 4445677 (1984-05-01), Hansen et al.
patent: 4533424 (1985-08-01), McElroy
patent: 4542892 (1985-09-01), Goldner
patent: 4556207 (1985-12-01), Thompson et al.
patent: 4894521 (1990-01-01), Evans
patent: 4957570 (1990-09-01), Jenkins et al.
patent: 5163713 (1992-11-01), Brettell et al.
patent: 5398974 (1995-03-01), Mizukawa et al.
patent: 5505811 (1996-04-01), Welch et al.

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