Spin welding apparatus

An apparatus for frictionally joining a cap member to the neck of a container comprising:

• a rotatable spindle member having a head portion adapted to releasably engage said cap member;
• means to separately support said container and prevent said container from rotating;
• means to rotatably support said spindle member;
• means to move said spindle member toward and away from said container;
• biasing means operatively associated with said means to move said spindle member toward and away from said container to effect a predetermined tension on said spindle member prior to and during contact of said cap member on said neck of said container and limiting the stroke of travel of said spindle member as said cap member is moved toward said container;
• and
• means to rotate said spindle member so as to effect frictional engagement and securing of said cap member on said neck.

An apparatus for frictionally joining a cap member to the neck of a container comprising:

• a rotatable spindle member having a head portion adapted to releasably engage said cap member;
• means to support said container and prevent said container from rotating;
• means to rotatably support said spindle member;
• means to move said spindle member toward and away from said container;
• biasing means operatively associated with said means to move said spindle member toward and away from said container to effect a predetermined tension on said spindle member prior to and during contact of said cap member on said container neck and limiting the stroke of travel of said spindle member as said cap member is moved toward said container neck;
• a pair of oppositely disposed jaw members each having a surface constructed and arranged to substantially surround said neck of said container and said container neck includes a rib member supported by said jaw members;
• and
• means to rotate said spindle member so as to effect frictional engagement and securing of said cap member on said neck.

In a spin welding apparatus for frictionally securing thermoplastic caps to thermoplastic neck surfaces of containers, said apparatus comprising:

• a rotatable support means to support a multiplicity of oppositely disposed rotatable spindle members having head portions adapted to engage said caps;
• means to position and support said containers and prevent said containers from rotating;
• means to move said spindle members toward and away from said containers;
• and
• means to rotate said spindle members, the improvement comprising;
• biasing means operatively associated with each said means to move said spindle members toward and away from said containers to effect a predetermined tension on said spindle members and said caps on said neck of said containers, said biasing means effecting a predetermined tension on said spindle members prior to and during contact of said caps on said neck surfaces and limiting the stroke of travel of said spindle member as said cap member is moved toward said container so as to effect frictional engagement and uniform securing of said cap on said neck surfaces.