In an extruder for manufacturing clay pipes, a socketed end portion of each pipe is formed by an annular mould which is positioned at the extruder outlet during moulding and withdrawn after moulding to permit extrusion of the pipe. The shoulder portion of the mould is attached to the extruder mouth, whereas the mould core and the mould side-wall are withdrawable, the side-wall being movable axially relative to the core by means of pneumatic actuators so that a downward movement of the side-wall ...

A device for use in driver instruction, intended to be used in combination with a steering wheel, the device comprising stops that prevent a user's hands from passing through upper and lower regions of the wheel while gripping the wheel. A preferred embodiment comprises a plate having instructions for the use of the device and correct steering printed thereon.

A length of exposed, photographic film is coupled to a pliable package containing a developer. The pliable package and the film are drawn through a rigid container that discharges the developer from the pliable package into the rigid container and onto the film.

A multisection shield incorporates means for subterranean excavation and for removal of excavated materials, and provides for the installation of planked lining within the shield. The apparatus is employed in a system of tunnel or conduit lining wherein floor and roof planks are prepositioned, and side wall planks are thereafter wedges in place therebetween. The apparatus further includes a forward safety bonnet operated in advance of excavation, and directional control means.

Low molecular weight, nonwandering compounds for hardening natural and synthetic colloids without afterhardening. These comprise compounds having the structural formula: wherein each R is hydrogen, an aliphatic or aromatic radical, and R.sup.2 and each R.sub.3 are hydrogen or lower alkyl.

An ashtray with interconnected indicator means for showing use thereof. The indicator means is particularly useful for ashtrays that are mounted in aircraft seat armrests or in other public conveyances such that only those showing usage need be cleaned by maintenance personnel. The indicator means is tripped by the opening of the ashtray lid, or by a movable snuffer section, so as to show usage, while a "reset" to show a clean ashtray is only accomplished by a "reset key" or by a special operati...

Synergistic mixture of a boron compound devoid of nitrogen and at least one of a hydroxyphenone, an N-hydroxyphenylbenzotriazole and a salicylic acid ester. The mixture is used as an additive to stabilize plastic, resins and fibers against deterioration due to weathering, oxidation, heat, etc.

A gun sling for firearms of the rifle or shotgun type. The firearm is supported in muzzle-down position by a sling passing around the body of the shooter and attached at its lower end to a cup supporting the muzzle and at its upper end to a portion of the stock. A gun worn in this position is easily and comfortably carried, protects the muzzle against damage and entry of foreign matter, and the supporting cup quickly drops away by gravity upon slackening of the sling to allow the gun to be rapid...

A fishing hook having a shank and a hook end, and a gripping member positioned alongside the shank with the adjacent ends of the hook and gripping member attached to a ring. The free end of the gripping member is movable to and from a position adjacent the shank and at rest projects away from the shank. A separate member is slidable over the gripping member and shank to force them toward each other so that bait can be clamped therebetween.

Synergistic mixture of (1) the reaction product of from one to two mole proportions of amino compound and one mole proportion of polyhalopolyhydropolycyclicdicarboxylic acid or anhydride and (2) salt of oxyalkylenated alcohol phosphate and amino compound.