Abstract: There are disclosed herein power tool boring bits having boring depth indicating markings on the shanks thereof. The markings are produced by colored oxiding of substantially the entire shank of the tool followed by selective abrasion of the shank to remove bands of substantially only the thin surface oxide in alternate array with bands of the colored oxide.

Abstract: There is disclosed a planetary gear winch comprising a selectively operable freewheel arrangement therefor. The freewheel arrangement of the invention provides the winch operator with the ability to disengage the winch drum from the planetary gear reduction drive train, under no-load conditions, thereby to allow freewheeling rotation of the winch drum and rapid unwinding of line therefrom.

Abstract: Disclosed herein is a rotary power coupling comprising rotatable spaced-apart driving and driven members and a torque-transmitting coupling plate interposed therebetween. The coupling of the invention is of particular use in those applications wherein it is of value to isolate power train components and/or assemblies from certain operational strains imposed upon the power user. In a planetary gear winch assembly the coupling of the invention is located in the power train between the output of the final planetary gear speed reduction stage and the winch drum.

Abstract: There is disclosed vertical shaft impeller pump apparatus especially suitable for bilge or other applications where installation space is limited. The pump apparatus, including preferred embodiments thereof, is characterized by high pumping efficiency, long service life, compactness, and flexibility of assembly geometry whereby orientation of the top portion, the discharge means, and the base of the apparatus are variously alignable relative to one another.

Abstract: An insect electrocution device comprising a cage having a high voltage applied thereto and an insect attractant light disposed therein. The insect attractant light is disposed in an arrangement comprising a ring-like, outwardly-facing parabolic reflector and an insect attractant light source disposed substantially within the focus of the reflector. Plural arrangements are used to substantially fill the cage and provide the visual effect of a single band of light of uniform intensity emanating from the entire length thereof.