Roll-up type U-tube manometer

A flexible U-tube manometer of the roll-up type comprising, in combination:

• an elongate flexible body formed from a transparent flexible plastic material and defining a pair of spaced apart tubes extending longitudinally of said body and joined together by a web integrally connecting same that extends substantially the length of said tubes,
• said web defining a forward facing side surface on the front side of said body and a rearwardly facing side surface on the back side of said body,
• said body along its front side and adjacent the juncture of the respective tubes and said web defining a pair of continuous flanges,
• one of said flanges being disposed along one of said tubes and the other of said flanges extending along the other of said tubes,
• said flanges being in overlying, closely spaced relation relative to said web and each defining a continuous projecting edge portion that parallels said body,
• with said flange projecting edge portions being spaced apart transversely of said body,
• said flanges and said web defining therebetween a scale slideway that is open between said flange edge portions,
• an elongate flexible scale member mounted in said slideway for sliding movement therealong,
• said scale member comprising a length of spring steel of film thickness dimensions that is arced forwardly of said body web along the length of said scale member,
• said scale member bearing manometer scale indicia on its forward facing side and defining side edge portions therealong on either side of same that extend longitudinally of said body and that are respectively slidably engaged by the respective flanges, whereby said scale member is frictionally retained in selected zero adjust positions within said scale slideway,
• said scale indicia including at the midlength portion of said scale a datum zero marker means on each of said scale side portions and aligned transversely of said scale,
• means for connecting said body tubes at the lower end of said body,
• means for connecting said tubes at the upper end of said body to locales of fluid pressure to be measured manometer style,
• said tubes being substantially half filled with fluid pressure measuring liquid manometer style whereby when said manometer is vertically disposed in rectilinear relation and said means for connecting said tubes to the fluid pressure locales is vented for both tubes, the levels of said liquid in said tubes are horizontally aligned,
• and a knob fixed to said scale member adjacent to said datum zero marker means and projecting forwardly from said scale member forwardly projecting side through and between said flange edge portions,
• whereby when said levels of said liquid in tubes are horizontally aligned under said vented conditions, said scale member may be moved longitudinally of said slideway by the user of said manometer grasping said knob with one hand and eye leveling said scale member datum zero marker means with said horizontally aligned tubes liquid levels to zero set said manometer free of finger pressure application to said scale member at the ends of same.