Device for sealing containers made of heat-sealable material

A device for sealing containers made of heatsealable material, particularly suitable for the closure of containers containing pasty fat substances, comprising an elastic means for supporting one of the two walls of the container which are to be heat-sealed to one another, an assembly movable towards the mean plane of said container, said assembly including a head on which are slidably mounted two rigid plane members on either side thereof which are downwardly and inwardly convergent such that the lower portions thereof may be in substantial engagement with each other, the lower edges of each plane member being tapered to a sharp point, said head having mounted thereon at the lower portion thereof a heating means such that movement of said head downwardly relative to said members places said heating means into engagement with the outer wall of the container and pushes the container into engagement with said elastic support, said downward movement of said head further moving said members away from each other while said members engage the upper wall of the container, the angle of said members being maintained constant during said movement and said plane members remaining in coextensive engagement with the respective surfaces of said head, means for causing the movement of the assembly towards said elastic support, and means for causing the movement of said rigid plane members relative to the head.