Method of making a water level control device

摘要

A method of making a water level control device comprising the steps of forming a frame to have a substantially flat frame plate with opposite sides and with an elongated slot passing therethrough and having a first portion, forming a movable cam follower to be carried by the frame for setting the desired water levels to be provided by the device, forming a slide cam member to have a projection extending through the slot to guide sliding movement thereof relative to the frame, forming the projection means to have an interlocking unit interlocking with the frame while the projection is disposed in the first portion of the slot, forming the cam member to have a cam surface engaging the cam follower to set the same in desired water level setting positions thereof when the projection is in the first portion of the slot, forming the slot to have a second portion thereof for unlocking with the interlocking unit when the projection of the cam member is disposed in the second portion whereby the cam member can be easily detached from or attached to the frame, and forming the interlocking unit of the cam member to bear against one of the sides of the frame plate when the projection is in the first portion of the slot by providing the cam member with a plurality of spaced apart abutments extending outwardly therefrom and bearing against the other of the sides of the frame plate when the projection is in the first portion of the slot so that the projection of the cam member is under tension when the projection is in the first portion of the slot whereby the interlocking unit and the abutments compress the frame plate therebetween and thereby provide resistance to sliding movement of said cam member relative to the frame when the projection is in the first portion of the slot.