Abstract: A locking device has a locking plate mounted on a ball valve housing and a hasp slidably mounted on the locking plate for movement into a position in which the hasp can engage the ball valve handle to prevent movement thereof irrespective of whether the handle is in the ball valve open position or the ball valve closed position. When the hasp is disposed to engage the handle, an opening in the hasp is aligned with an opening in the locking plate to receive a padlock for locking the hasp in the handle engaging position so that the handle cannot be turned to move the ball valve.

Abstract: Disclosed is a portable, pulse-jet engine powered fog producing device in which the valve controlling the flow of the fluid forming the fog is of simplified construction utilizing a mating conical cavity and a conical, resilient valve member which is also provided with an integral shoulder forming a dynamic seal for the valve stem with respect to the valve body. A manual lever, having a unidirectional connection to the valve stem, has a locking and "dead man" feature.

Abstract: The present hand gun receives pressurized hot melt adhesive and the like via a heated flexible hose. The operator's handle and the supply conduit for adhesive project in a common plane from opposite end portions of the gun barrel. Although generally parallel, the handle and conduit typically are inclined toward each other and are joined at their ends remote from the barrel, forming a rigid generally polygonal frame with ample opening between the handle and conduit to receive the fingers of a hand gripping the handle. The gun thus completely isolates the operator's hand from the path of supply of the molten material, while still permitting the hose to extend generally downward from the gun in most positions of use. The disclosed configuration further provides a well protected location for the control trigger. An improved safety latch for the trigger is disclosed. The swivel connection between gun and hose provides fully enclosed access for electrical wires.

Abstract: Disclosed is a lock for a valve having a stem which by rotation controls the opening and closing of the valve. The lock essentially comprises a housing having a first opening therein to receive the stem and a second opening; a locking member is disposed in the second opening and comprises a terminal portion which in its closed position contacts the stem and prevents the stem from rotating, a middle portion connected to the terminal portion and having a periphery substantially equal to the greatest periphery of the second opening, and an end portion connected to the middle portion and having a periphery less than the greatest periphery of the second opening.