Abstract: A water bed crib comprising a water bed structure including a flat horizontal rectangular platform with an upwardly projecting mattress retaining, water draining weir about its perimeter, a water filled flexible mattress bladder supported atop the platform within the confines of the weir, platform legs at and depending from the four corner portions of the platform, floor engaging caster wheels at the lower end portions of the platform legs, crib frame legs supporting brackets projecting outwardly from the platform legs; a rectangular crib frame with vertical end boards and vertical side gates engaged about the water bed structure and having crib frame legs depending from its four corners and engaging the brackets on the platform legs; the crib frame legs have caster pintle receiving openings in their lower ends and the brackets have retaining pintles engaged in said openings.

Abstract: A flat, normally horizontal electric resistance blanket heater comprising a thin, fragile elongate resistance element on one surface of and carried by a thin, flexible sheet of dielectric material, a thin, flat resilient and flexible reinforcing strate of dimensionally stable material retained adjacent the other surface of the film to permit flexure of the heater and without dimensional distortion of the film and element and a flexible envelope encapsulating the sheet element and strate.The heater also includes temperature responsive switching means responsive to the temperature of heated portions of the heater and in temperature insulated relationship from a portion of the heater where the element connects with power supply lines and which creates a portion in the heater of increased mass and heat storing capacity.

Abstract: The combination of a water bed structure comprising a horizontal platform, a water-filled flotation mattress with a bottom wall atop the platform and a retainer projecting upwardly from the platform and supporting the perimeter of the mattress, and a heater system maintaining the mattress at a set operating temperature including a resistance heater between the platform and said bottom wall and spaced inward from the retainer; temperature control means for the heater including a control unit at the exterior of the bed structure, a service cord between the unit and a power source, an elongate flexible electrical loom having inner and outer end portions and including an outer jacket, a pair of power lines coextensive therewith and a pair of current conductors coextensive with the inner portion thereof, a temperature sensing device within the central portion of the loom and connected between the conductors, the inner ends of the lines connect with the heater, the outer ends of the lines and conductors are connect

Abstract: A flotation mattress comprising an outer jacket of supple flexible sheet plastic having normally flat vertically spaced top and bottom walls and vertical side and end walls and a plurality of elongate bladders of supple flexible sheet plastic with top, bottom, side and end walls arranged within the jacket in parallel side-by-side relationship with each other and slackly filled with water, the dimensions of the related and assembled bladders being substantially the same as the dimensions of the jacket whereby the bladders are captively retained in assembled relationship and are reinforced by the jacket. The jacket has a plurality of elongate, vertical parallel partitions, each occurring between a pair of adjacent bladders and stopping displacement of the bladders within the jacket.

Abstract: A water bed crib comprising a water bed structure including a flat horizontal rectangular platform with an upwardly projecting weir about its perimeter, a water filled flexible mattress bladder supported atop the platform within the confines of the weir, platform legs at and depending from the four corner portions of the platform, floor engaging caster wheels at the lower end portions of the platform legs, crib frame leg supporting brackets projecting outwardly from the platform legs; a rectangular crib frame with vertical end boards and vertical side gates engaged about the water bed structure and having crib frame legs depending from its four corners and engaging the brackets on the platform legs; the crib frame legs have caster pintle receiving openings in their lower ends and the brackets have retaining pintles engaged in said openings.

Abstract: In combination, a water bed frame with side boards, a water filled flotation mattress within the frame, an electromagnetic vibrating transducer unit between a side board and the mattress and operable to generate and transmit motion into the mattress and an adjustable power supply connected with a 60 Hz. domestic power service and delivering current at a fixed frequency and at sub-harmonic frequencies of said fixed frequency to the unit; said unit includes an elongate resilient armature with front and rear end mounting means and fixedly mounting the rear end portion of the armature, an electro-magnetic driver fixedly mounted in predetermined working relationship with the rear end portion of the armature and receiving power from the power supply and a tuning weight on the front end portion of the armature to increase the mass thereof and shiftable longitudinally to tune the natural frequency of the armature into synchronism with the frequency of the power delivered to the driver.

Abstract: A thin, flat, multi-laminate resistance heater structure including a pair of spaced laminates of dielectric material with opposing inner surfaces, an elongate resistance element arranged between and extending throughout the major surface areas of said opposing surfaces, bonding material about the element and between the element and between the laminates and a filler in the bonding material comprising a multiplicity of strong dimensionally stable particulate components of a dielectric material having a lower dielectric constant than the bonding material.

Abstract: A mounting fixture to mount a box-like electric heater control unit on the lower rigid wooden frame structure of a box-spring to support the control unit adjacent one side of the box-spring above the plane of the frame structure for convenient visual monitoring and manual operation; the box spring includes resilient and flexible spring and pad structure overlying the frame to support a heater and a mattress and which affords no suitable structure for mounting a heater control unit; the fixture is a unitary sheet metal part with a lower frame engaging portion, an upper control unit mounting portion and an intermediate portion orienting the upper portion above and laterally outward of the lower portion; the control unit is a box-like unit having a rear wall with fastener receiving openings, a manually engageable control part and elongate power cords extending to an electric heater above the box spring and to a remote power source; the upper portion of the bracket has a flat surface opposing the rear wall of the

Abstract: An elongate fabricated box-like cabinet for electrical apparatus comprising like horizontal top and bottom walls, like vertical end walls, and vertical front and rear control and service panels; the top and bottom walls have vertically spaced opposing inner surfaces with laterally spaced longitudinal flanged projections thereon defining vertically opening longitudinal grooves and horizontally opening longitudinal channels disposed toward the channels of adjacent projections; the vertical panels have upper and lower edge portions releasably engaged in the foremost and rearmost grooves in the top and bottom walls; the end walls have axially inwardly disposed surfaces engaged with opposing ends on the top and bottom walls and overlying the ends of the panels; the end walls have axially inwardly projecting retaining flanges engaging the inner surfaces of the top and bottom walls and the inner surfaces of said panels; the end walls carry screw fasteners engaged in the ends of related grooves defined by the project

Abstract: A flat normally horizontal electric resistance blanket heater comprising a thin, fragile elongate resistance element established on one surface of and carried by a thin, flexible film of dielectric material, a thin, flat resilient and flexible reinforcing strate of dimensionally stable material retained adjacent the other surface of the film to allow for controlled flexure of the heater and prevent dimensional distortion of the film and element and an envelope of flexible dielectric plastic film encapsulating the film, element and strate.The heater also includes temperature responsive switching means responsive to the temperature of heated portions of the heater and in temperature insulated relationship from a portion of the heater where the element connects with power supply lines and which creates a portion in the heater of greater mass and heat storing capacity.

Abstract: The combination of a water filled flotation bed mattress with a filler neck and an elongate flexible cord-like heater structure comprising an elongate power supply cord section with inside and outside end portions and a filler neck engaging and sealing means between its end portions and engaged in and sealing said neck with said inside end portion extending into the mattress and the outside portion extends from the mattress, an elongate flexible resistance heater section with inner and outer ends arranged within the mattresses and including a water proof jacket structure and an elongate resistance element within extending from the inner to the outer end and thence to the inner end of jacket structures; and temperature control means including an elongate rigid metal tube with inner and outer ends engaged with and between the free end of said inside portion of the cord section and the inner end of the heater section, insulated conductors extending through the tube and connecting ends of the element with related

Abstract: A soft, resilient and flexible blanket type electric resistance heater comprising a sheath including top and bottom panels of thin, supple, flexible and elastic sheet material and substantially similar in plan configuration; an elongate, flexible electric resistance element having greater tensile strength than the sheath is loosely arranged in a slack serpentine pattern between and throughout the plane of the panels with adjacent portions in variable spaced relationship from each other; the edge portions of the panels are fixed together about their perimeters; the panels are fixed together at locations between and spaced from adjacent related portions of the element to maintain adjacent portions of the element in spaced relationship from each other; the air in the space between the panels is exhausted therefrom to reduce the presence of heat insulating dead air spaces between the panels and to permit the panels to establish substantially uniform heat conducting contact with the element; a power supply cord ha

Abstract: A water bed structure comprising a flat horizontal mattress including a bladder having vertically spaced horizontal top and bottom walls and vertical side walls of flexible water impervious sheeting and a volume of water within and filling the bladder, a flat horizontal pad of resilient reticulate material within the mattress and the water therein and positioned on the bottom wall and having a top surface normally spaced below the top wall, a retainer unit comprising a flat horizontal panel below and in supporting engagement with said bottom wall and a tubular frame about the panel with a portion projecting upwardly therefrom and cooperating therewith to define a basin in which the mattress is positioned; said frame has a vertical inside wall opposing and supporting the side walls of the mattress, said inside wall having openings communicating with the basin and the interior of the frame whereby water leaked or spilled from the mattress into the basin flows from the basin into the frame.

Abstract: A vibratory transducer in combination with a water bed structure including a frame with vertical side walls, a horizontal platform within the frame and a water filled bladder mattress within the frame and supported by the platform; said transducer includes a body in seated engagement in a corner established by the top of the platform on the inner surface of one side wall, said body has an inwardly and upwardly disposed inner side with an access opening extending diagonally across said corner; a drive plate is engaged with the mattress and overlies said inner side in spaced relationship, means is provided to couple the plate with the body for limited movement relative thereto; an electro magnetic vibrator is fixed to the plate to project freely through said access opening and into the body and is operable to vibrate the plate and transmit vibratory motion into and through the mattress.

Abstract: An electric resistance heater engageable with work to be heated including a work-engaging heater structure of minor thermal mass per unit area and including an elongate primary heating element arranged to establish high watt density throughout said heater structure, a power supply, a temperature control means between and connected with the primary heating element and the power supply; said temperature control means including a work engaging body of greater thermal mass per unit area than the heater structure and carried by said heater structure in spaced relationship with the primary heating element, a normally closed thermal responsive switching device within the body and operable to open when the temperature of the body is heated by heat conducted from the work to a predetermined operating temperature, an elongate secondary heating element arranged in the body to delivery sufficient heat into the body to normally maintain the temperature thereof at a temperature slightly below said operating temperature whe

Abstract: A turbidimeter having an elongate fluid conducting body with an access opening at one end and spaced fluid inlet and outlet openings with means to connect the body between sections of a fluid conducting line, a plug-like service unit releasably engaged with and normally closing the body, a light emitter, a conducting light pipe conducting light from the emitter to the end of the body remote from the unit and directing light back towards the unit, a first photo cell carried by the unit and receiving light directed by the light pipe, a second photo cell matched with the first photo cell heat sink means to equalize the temperatures of the cells, power supply and signal transmitting means for the emitter and for the cells, said signal transmitting means including means comparing the signals from the cells.

Abstract: A remote control unit for an electric heater comprising a box-like housing with an interior partition defining a circuit board chamber and a control knob chamber. The circuit board chamber includes means to support a circuit board with a current control component having a freely projecting rotary operating shaft.

Abstract: Apparatus for tempering drilling mud preparatory to testing the mud for petroleum content comprising a plurality of cylinders with heat-sinks about their exteriors, resistance heaters in the heat-sinks and temperature control means related to the heaters and heat-sinks, pistons engaged in the cylinders and shiftable longitudinally therein to draw mud into and drive mud out of the cylinders, valve controlled flow means connected with and between the cylinders and upstream and downstream sections of a mud conducting flow line and operable to conduct mud from the upstream section into the cylinders and from the cylinders to the downstream sections and operable by pressure differentials in the cylinders resulting from the movement of the pistons therein, drive means to move the pistons and means controlling operation of the drive means and responsive to the temperature of mud in the cylinders, the pistons operate to wipe and displace mud caked on the walls of the cylinders to be recombined with fluid mud, whereby