Patents Completed.
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Complete specifications of the following patents will be sent to any address in the United Kingdom upon receipt of eightpence per copy at the Sale Branch, Patent Office, Holborn, W.C.
UNDERCUTTING DRILL. — Bruce Peebles and Co. and Another.—No. 23,967, dated 11th December, 1909.—This specification describes a tool for undercutting or enlarging the inner end of a drilled hole rind is intended for use on
comparatively-suft materials, such as carbon brushes, insulating material aud the like. It consists of a round spindle, the lower end of which is cut away to the size of the hole. This spindle is slotted at the lower end and the cutting tool is pivoted in this slot. The tool is fed outwards for the undercutting by the vertical movement of a sleeve loose on the spindle and engaging the upper end of the cutter. A spring holds the sleeve up and keeps the cutter retracted. In using the device, it is fixed like an ordinary drill in the spindle and inserted to the bottom of the hole to be undercut. As the spindle rotates, the sleeve is gripped by hand and gradually forced down, so forcing the cutter outward to effect the undercutting. The amount. of such outNkard movement is accurately limited by the radial depth of the groove, and the device is thus adapted for rapid and acenrate repetition work. When the undercutting is complete, the sleeve is icleased and the spring forces it upward, retracting the cutter and allowing the device to be withdrawn from the hole.
T AXIMETER.—North.—No. 27.113. dated 22nd November, 1909.—The object
of this invention is to provide means whereby the driver is compelled to operate the " extra "-registering me chanisin w hen taking up an " extra " fare. For this purpose, each of the front seats is pivotally mounted in such a manner that it can be turned up out of the way when not required, and is locked by a suitable clutch device when in that position. The means for locking and releasing the " extra" seat ate connected with the lever relating to the corresponding dial in such a way that the seats cannut be released until the " extra "-registering mechanism is set in =lion. Each of the front seats is pivotally mounted on a shaft., and also fixed upon this shaft is a wheel or disc provided with a suitable notch or recess. A short fixed shaft of square section carries a toothed disc which can engage with this notched disc_ The slidable clutch disc is normally kept in engagement with the disc fixed to the shaft of the seat by a spring, and the said slid-able disc is connected with the
• extra " lever of the taximeter relating o that partictilar seat. Instead of employing an extra lever for each extra seat, 't is preferred to use one lever and so ar'ange the connections that, a given movement will release the seat on the far side 'rorti the driver, and a further movement will release the second extra seat. This ensures the vehicle's being betterbalanced when carrying one extra passenger,
CARE URETTER. — Ionides. — No, 10,148, dated 26th April, 1910.—The carburetter is arranged so that the move molts of the fuel-controlling valve are not subject, to static friction but only to the lesser kinetic friction; that is, the. salve gear is kept in motion and a separate controlling, motion is given to it. A needle valve is arranged over a central inlet pipe, and it has fixed on it a cylindrical casing to which are fixed a munber of radial fan blades. These are arranged over the primary air inlets and the whole rotates in a cylindrical casing which forms the mixing chamber. This casing is provided with adjustable V. slots varying the air supply. When the suction increases, the fan is lifted and thereby lifts the needle valve and so admits more fuel. Adjustable secondary air inlets arc provided round about the mixing chamber, and the fuel supply is also controlled by ii lever which has a stirrup engaging projections on the needle valve, and which also has an adjustable counterweight on the outside_ The upper part of the mixing chamber is water-jacketed. The fuel enters past the needle valve and flows outwards and downwards on to the fan blades where it is distributed by centrifugal force.
STUFFING-BOX. — B e a m. — No. 30,439, dated 30th December, 1909.—According to this invention, the stuffing.
box is provided With the usual neck bush which is made a loose tit round the rod to be packed. Against this bush sits a brass casing cylindrical on the outside arid conical on a certain portion of its interior surface ; the remainder of the interior surface being bored out to fit tile rod. A series of white metal rings is arranged in the conical annular space, the outer rings being split and the innermost ring being preferably slotted away locally almost to its periphery. This innermost ring may he arranged to bear against a ring for fibrous packing. The cylindrical space left between the casing and the inner wall of the box is filled with soft packing, and a flat ring, fitting tight ou the rod, but clear from the box, is disposed against the outermost conical ring, and a final layer of soft packing is placed outside this ring. The gland holding in the white metal rings may be arranged with a smaller but similar packing or a fibrous packing. It is preferred, however, to use metallic packing. Various alternative constructions are suggested.