Abstract: An apparatus for inspecting glass bottles generally comprises an operation table, an annular conveyor passage onto which glass bottles to be inspected are conveyed one-by-one and on which the bottles are moved slidably, and a turn table coaxially disposed inside the annular conveyor passage. A plurality of guide members are circumferentially mounted on the peripheral surface of the turn table, and a plurality of bottle inspecting stations are disposed circumferentially and spaced equally therearound. The inspecting stations include a down sealing surface measuring station for measuring the down sealing surface of the lip portion of each bottle, an outer diameter and perpendicularly measuring station for measuring outer diameters of the various portions of each bottle and an inner diameter measuring station for measuring the inner diameter of the lip opening. The bottles inspected or measured are conveyed out of the conveying passage and selectively divided into defective bottles and satisfactory bottles.

Abstract: A glass container forming mold, comprising an outer member formed of a metal, an inner member formed of a carbon material, and a flexible, compressible carbon sheet interposed between the outer member and the inner member, is provided.

Abstract: In the fabrication of a plastic sleeve by heat sealing overlapped ends of a plastic film blank wrapped around a mandrel, a part of the underlying overlapped end is often melted inadvertently and adheres to the mandrel, obstructing easy stripping of the sleeve off the mandrel. Accordingly, a tensioning groove is formed in the mandrel surface, and a pressing-in bar is pressed thereinto over the sleeve while a part of the sleeve is held stationary against the mandrel by a holding plate to pull the sleeve part thus adhering sidewise in the peripheral direction of the mandrel and thereby to peel away and free the same.

Abstract: An impact rod is vertically guided within a guide cylinder to drop into a glass bottle to be tested which is held vertically below by a bottle gripper, the impact rod thereby striking the bottom of the bottle with preset impact force. A plurality of these guide cylinders with respective impact rods and corresponding bottle grippers are supported on structures revolving unitarily around a pole, the bottle grippers operating to grip successively bottles supplied from a production line and to carry the bottles around a partial circle as they are tested by the corresponding impact rods which are operated by adjustable cam action. The impact force is adjustably variable by adjusting the height of drop and/or weight of the impact rod.

Abstract: A plastic sleeve is fabricated by: winding a blank of plastic film around a hollow cylindrical mandrel having a groove of arcuate cross section extending in the mandrel axial direction along the mandrel outer surface and having numerous through holes through its wall including the concave surface of the groove, the blank ends being overlapped; applying a vacuum through the holes to the inner surface of the blank thereby to draw it by suction tightly against the mandrel outer surface; heat sealing the overlapped ends of the blank thereby to form a sleeve; and vitiating the vacuum and applying pressure above atmospheric to the inner surface of the sleeve thereby to facilitate the succeeding step of stripping the sleeve from the mandrel and fitting it on a glass bottle.