PATENTS SUMMARIZED.
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A -Bluemel Sparking Plug.
Of types of sparking plugs there would seent to be enough and to spare,' yet scarcely a week passes withont,scinrie, • .
one applying for a patent for an alleged improvement On 'existing designs. Oc casionally, however, a known maker seeks p"roteet sbme improved construction,
the object of which may be that ofimproving the efficiency of the plug as . an ignition accessory. The ideal aimed at in specification No. 110,492, in Whichinvention Blueinel ' Brothers, Ltd., of ..WoLston, near Coventry, has -an interest, is that of ensuring a gas7tight'joint between the insulator and: the body of the ,plug, whilst' allowing for adequate and independent expansion of either. The insulator, is forined with an 'exterior conical portion near the top. The metal. body of the plug, at the part which Surrounds the 'conical portion-. of the:insulator; is coned.internally,, but is slightly larger in diameter than the
latter. The intervening space, as shown in the sketch, is filled by a suitable alloy, which is run into place while molten. The joint between the lower ends of , these two parts of the plug is made by means of a copper and .asbestos ring. The central electrode is secured within the insulator in a similar manner.
A Reavell Compressor
The present position with regard to the use of gas on commercial vehicles . and the attention which is being paid to the •possibilities of its future develepment as, an after-the-war fuel, render the hand-driven compressor,' which has recently been the subject of a patent, of interest to 'our readers. The patentee, Reavell andCo., Ltd., of Ranelagh Works,. Ipswich, is a well-known maker of compressw.s. •
" The invention, of which the specification to which we refer treats "(No. " 110,557), has in the Main to du with the securing of the compressor to gun mountings; in Ithat.respect, "of, "course, it does " not directly interest us. The 'design of •
C62; the machine itself, however, is interesting, and with' that we propose to deal in our description.
The compressor is a two-stage one, that is to say, it is one in which the compression takes place in two steps. The larger, cylinder, which Appears on the right in one of the two drawings which we reproduce from the specification, is called the low-pressure cylinder, and in it the first of the two stages of compression is effected. As the piston moves to the left, air gas is drawn in through the conical inlet valve which is shown in detail in the 'separate drawing of the cylinder cover. On the return .stroke the gas is compressed until it reaches a pressure sufficient to open the outlet valve against the spring. This completes the first stage. As the gas is forced out of the low-pressure'cylinder, it enters a passage or pipe, -which 'is shown in our drawing; in the latter it undergoes the second stage of its COMpression. From the outlet valve -of the second cylinder, of course, the gas is led to any desired reservoir. . In the drawing, the compressor is designed for operation by -hand. This is no doubt quite feasible for the particular purpose for .which it is designed that of supplying small quantities of compressed air for use in gun-laying. It is not likely, however, that operation by hand would be practical for the purpose we have in view, as the quantities required are so much larger.
Anirnproved Speedometer Drive.
L. E. Cowey, of Archer Works, Station Avenue, Kew Gardena, describeS, in patent specification No. 110,479, a form of oil and dirt-tight cover for the gearing of a speedometer drive. Each of two cases, one of which surrounds each of the drive shafts, is prolonged, and has formed, integral with it, a cylindrical portion at right angles to itself. The cylindrical extension of one casing is of such a diameter that it is a close fit within the other. Suitable slots are cut in each, as shown in the drawings, so that one of them can be moved through a right angle, carrying with it its corresponding shaft. This allows for freedom of motion in the same plane as
the shafts. The other case is mounted in a bracket,which allows of motion in a plane at right angles to this; reference to our illustration will enable the reader to grasp our meaning, and by these 'two movements considerable latitude in the fixing of the driving gear is permissible.