Hot melt dispenser body
AssigneeUSM Corporation
InventorsRichard Montgomery Elliott, Albert Eugene Newton
Life of this patent
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Abstract
A hot melt body for an applicator or dispenser of thermoplastic adhesive first received in solid form, either as a progressively fed rod or in another mode, is provided having especial advantage in a light-weight hand-type device. The main melt chamber and its auxiliary channels as well as their interconnecting passageways are of configuration and spacing to effect maximum efficiency in transfering melting heat from a heating means to the adhesive being liquefied. To this end, also, complemental portions of the body include passageways designed to provide minimum, substantially uniform resistance to advance of the solid adhesive along the length of the melt body.
Claims7
A hot melt body for an applicator of thermoplastic material to be advanced from an inlet to an outlet end and progressively reduced from solid to fluid as the material is thus fed, the body comprising elongated complemental portions defining a longitudinal main melt chamber extending between the inlet and outlet end and having progressively diminishing cross sections toward the outlet end shaped to constrain the material while at least partly solid to rectilinear movement and characterized by opposite side walls and at least one continuous flatted wall engageable throughout its length with the thermoplastic, complemental outer manifold passageways formed in the the respective body portions and leading to said outlet end, and a series of complemental bypass passageways formed in the respective body portions and interconnecting the main melt chamber at localities spaced therealong with the manifold passageways, said localities being disposed where solid thermoplastic material in said chamber is being rendered molten and semi-fluid, means in the body coextensive with said passageways for heating the walls of the main melt chamber and of the manifold and bypass passageways, said bypass passageways being generally angularly biased divergently relative to the side walls of said chamber in the direction of the feeding of said material in the main melt chamber.
A melt body for a device adapted to have rod-like thermoplastic fed into an inlet end of the body, comprising means for heating the body, a longitudinal main melt chamber extending from the inlet end toward an outlet end of the body and having successive cross sections changing transversely from substantially circular to progressively narrowing, generally rectangular shape toward the outlet end, no dimension of said shape being substantially larger than a dimension of the solid core of the thermoplastic to confine the core of the thermoplastic to a straight line, opposite walls of said chamber substantially unchanging in depth being open along at least one longitudinal side thereof to permit effusion of the thermoplastic therefrom, a manifold passageway extending in the body adjacent to its outer wall and substantially from said inlet end to the outlet, and bypass passageways interconnecting said opposite walls of the chamber at spaced localities therealong with the manifold passageway, said bypass passageways being disposed angularly to the direction of rod feed and having inlets respectively defined by at least one acute edge disposed to peel-off semi-molten and molten material from the core of the thermoplastic as it is fed in said main melt chamber.
Dependencies are inferred from the claim text.