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US 4,254,075 AGranted
Method for forming holes in a member
AssigneeReed Irrigation Systems
InventorsS. W. O. Menzel, David E. Mominee
Life of this patent
Estimating the term…
Abstract
A method of forming holes in plastic tubes which includes advancing a rotating shaft into and through the wall of the tube while maintaining a rate of rotation sufficient to cause the material of the tube to be distressed sufficiently to fluidize and/or disintegrate from the area of operation of the shaft, moving the shaft from the hole, and allowing the periphery of the hole to solidify.
Claims16
The method of forming holes in a plastic member which comprises:
- (a) advancing a smooth shaft having a smooth surface with the shaft spinning about its axis into and through the member while maintaining a rate of rotation sufficient to cause the plastic material of the member to fluidize due to the contact of the said smooth surface of the shaft with the same member with at least some of the fluidized material being in flowable form as the result of heat generated by friction due to said contact whereby to displace said material from the area of operation of the said shaft,
- (b) moving the said shaft from the hole so formed while maintaining the said flowable form of the plastic material between the shaft and the wall of the hole by substantially retaining the rate of rotation of the said shaft while moving it from the hole so formed,
- (d) allowing the plastic material in flowable form on the member around the said hole to solidify, and
- (d) removing at least some of any material adhered to the periphery of the shaft.
1 more element
A method of forming holes in a polymer tube comprising:
- (a) advancing a smooth shaft having a smooth surface with the shaft spinning about its axis into and through the wall of said tube while maintaining a rate of rotation sufficient to cause the polymer material of the tube to fluidize due to the contact of the said smooth surface of said shaft with the said tube with at least some of the fluidized material being in flowable form as the result of the heat generated by friction due to said contact whereby to displace said material from the area of operation of the said shaft,
- (b) moving the said shaft from the hole so formed while maintaining the said flowable form of the polymer material between the shaft and the wall of the hole,
- (c) allowing the polymer material in flowable form on the wall of the said tube around the said hole to solidify, and
- (d) holding said smooth shaft against inclination during the time that the shaft contacts the tube.
1 more element
The method of forming holes in polymer tubes which comprises:
- (a) advancing a smooth shaft having a smooth surface with the shaft spinning about its axis into and through the wall of said tube while maintaining a rate of rotation sufficient to cause the polymer material of the tube to fluidize due to the contact of the said smooth surface of said shaft with the said tube with at least some of the fluidized material being in flowable form as the result of heat generated by friction due to said contact whereby to displace said material from the area of operation of the said shaft,
- (b) moving the said shaft from the hole so formed while maintaining the said flowable form of the polymer material between the shaft and the wall of the hole,
- (c) allowing the polymer material in flowable form on the wall of the said tube around the said hole to solidify, and
- (d) providing a die having an aperture therein with said shaft extending through the aperture in close proximity thereto and moving the periphery of the shaft through the aperture to at least partially remove any material adhered to the periphery of the shaft.
1 more element
A method of forming holes in a plastic member comprising:
- providing a fluidizing device which includes a shaft mounted for rotation;
- providing a first wheel having a rim and at least one of the fluidizing devices mounted on the first wheel radially inwardly of the rim;
- rotating the first wheel;
- passing the plastic member over the rim of the first wheel while the first wheel is rotating;
- spinning the shaft of the fluidizing device;
- advancing the shaft while it is spinning through the plastic member while the member is being passed over the rim of the first wheel and while maintaining a rate of rotation sufficient to cause the plastic material of the member to fluidize due to the contact of the shaft with the member with at least some of the fluidized material being in flowable form as a result of heat generated by friction due to said contact, whereby to displace said material from the area of operation of said shaft;
- retracting the shaft from the hole so formed while maintaining the flowable form of the plastic material between the shaft and the wall of the hole;
- and
- allowing the plastic material in flowable form on the member around the hole to solidify.
6 more elements
Dependencies are inferred from the claim text.