Abstract: An apparatus for cutting materials and more specifically an improved saw blade includes a plurality of variable teeth thereon. The variable tooth saw blade cuts faster and smoother while reducing harmonic vibrations. Specifically, the teeth on the saw blade are grouped into sections with differing circumferential widths and differing spacing between the sections.

Abstract: A cutter bit is provided which includes a body having a pair of free ends with a cutter bit mounted adjacent each free end. A boss extends outwardly from the center of the body such that a portion of the body and the cutter bit may be mounted in a rotary cutting tool to allow the second cutter bit to be utilized. The bit is reversible such that either cutter bit may be positioned within the chuck of a rotary cutter tool while the cutter bit mounted on the opposite side of the body is utilized. A method of mounting a cutter bit in a rotary cutter tool is also provided which includes steps of loosening the bit within the chuck of the rotating cutting tool, removing the bit from the chuck, rotating the bit end to end, replacing the end of the bit that was out of the chuck originally into the chuck, and tightening the chuck.

Abstract: A cutter bit is provided which includes a body having a pair of free ends with a cutter bit mounted adjacent each free end. A boss extends outwardly from the center of the body such that a portion of the body and the cutter bit may be mounted in a rotary cutting tool to allow the second cutter bit to be utilized. The bit is reversible such that either cutter bit may be positioned within the chuck of a rotary cutter tool while the cutter bit mounted on the opposite side of the body is utilized. A method of mounting a cutter bit in a rotary cutter tool is also provided which includes steps of loosening the bit within the chuck of the rotating cutting tool, removing the bit from the chuck, rotating the bit end to end, replacing the end of the bit that was out of the chuck originally into the chuck, and tightening the chuck.

Abstract: A system having a server or group of servers connected to a network providing redirection for entered information containing reference codes and series identifiers to URLs in a given database. That system with additional servers providing an entry form for the reference codes and series identifiers. Those systems operating with the HTTP protocol. A method of referencing a URL indexed by a provided reference code in a database and returning the indexed URL. That method using the HTTP protocol. A system whereby an entry is made to a URL referencing database, the entry being provided with either a URL and series identifier or a code, URL and series identifier.

Abstract: Sensor for measuring the partial pressure of a gas in a gaseous medium, includes an electrochemical cell and a diffusion barrier with a porous membrane situated above an orifice made in a component surmounting a casing enclosing said electrochemical cell.

Abstract: A system having a server or group of servers connected to a network providing redirection for entered information containing reference codes and series identifiers to URLs in a given database. That system with additional servers providing an entry form for the reference codes and series identifiers. Those systems operating with the HTTP protocol. A method of referencing a URL indexed by a provided reference code in a database and returning the indexed URL. That method using the HTTP protocol. A system whereby an entry is made to a URL referencing database, the entry being provided with either a URL and series identifier or a code, URL and series identifier.

Abstract: The apparatus for detecting the presence of a particular gas within a mixture of gases comprises first and second emitter means for emitting measurement and reference electromagnetic radiation beams respectively, which beams are activated in alternation, a measurement cell, a filter cell, first and second detector means for detecting electromagnetic radiation beams, a beam splitter, and acquisition and processing means for synchronously acquiring and processing the four signals US1, US2, UR1, UR2 delivered by the first and second detector means in succession when the first and second emitter means are respectively activated so as to determine the absolute concentration of the gas to be detected on the basis of the ratio R=(US1×UR2)/(US2×UR1) between the four signals, in which US1 and US2 respectively represent the signals delivered by the first and second detector means when the first emitter means is activated, and UR1 and UR2 respectively represent the signals delivered by the first and s

Abstract: This direct current power supply for electric vehicles includes a modular set of electrical storage batteries (16) which are electrically interconnected. The batteries are disposed in battery boxes (18, 20) which can be stacked to constitute a stack of modules (12, 14).

Abstract: In this method of analyzing a gas mixture containing at least one inflammable gas to determine its explosibility, a resistive heating element (15) is energized in an analysis enclosure (12) communicating with the gas mixture to be analysed to burn the gas mixture in the enclosure, an electrical signal (S) at the terminals of the resistive element (15) is measured during combustion, and the explosibility of the gas mixture is determined from a comparison of values of the signal measured during a transient phase in which the concentration of the inflammable gas in the gas mixture is falling. The measurements taken during the transient phase are taken at times chosen to obtain, for different inflammable gases, substantially identical measurement signals for concentrations corresponding to identical explosibilities.

Abstract: In this method of determining the concentration of a gas to be analyzed in a gas mixture, the value of a characteristic of the gas mixture having predetermined laws of variation as a function of temperature and of the gas concentration is calculated from at least one measured value of the intensity of at least one radiation transmitted through the mixture at ambient temperature, the value of the said characteristic at a reference temperature is determined from the law of variation of the characteristic as a function of temperature and the value of the gas concentration is determined from the law of variation of the said characteristic as a function of the concentration.

Abstract: A battery container comprising a box with a lid. Ventilation openings are provided in the sides of the box. Part of the sides in which ventilation openings are provided may be attached to the lid. Apertures having drainage channels beneath are provided in the lid. The openings and apertures provide sufficient ventilation to meet the relevant regulations. The provision of apertures in the lid allows the overall height of the container to be reduced.

Abstract: A cutter bit includes a body integrally formed with a mounting shank. The body is formed with a pair of chip boxes having an arcuate surface and a planar surface with a cutting knife mounted to each planar surface. A plurality of equally spaced recesses are formed in the body to reduce cutter bit weight, and to promote heat transfer from the cutter bit to the surrounding atmosphere. Adjacent recesses form annular ribs which extend circumferentially around the body from one cutting knife to the arcuate surface adjacent the other cutting knife. The arcuate ribs operate as heat exchanger fins by substantially increasing the outer surface area of the cutter bit thereby substantially increasing the rate of heat transfer from the cutter bit to the surrounding atmosphere.

Abstract: A merchandising case adapted for displaying and storing cutter bits includes a cabinet, storage rack within the cabinet, a door movably mounted on the cabinet for concealing the storage rack, and a display rack mounted on the front of the door for holding the cutter bits on display. The display rack will retain a plurality of cutter bits on a display rack behind a transparent safety plate and above a display area. The display area has a plurality of individual receptacles, each receptacle retaining a plurality of chips each of which contains a die cut edge emulating the kerf profile created by a corresponding router bit positioned on the display rack, above the receptacle retaining the specific chip. A customer can remove one or more of the chips from the receptacle and compare it to the cutting edge of other cutter bits, or lay it against a workpiece.

Abstract: A miner's cap lamp includes a reflector having a substantially parabolic reflecting surface having a gradient variation from that of a true parabola curve Y.sup.2 =4MX along at least one line towards the outer edge of the reflector, wherein the gradient along the line has a value equal to that of a true parabola at the maximum value of X for the reflector but has a value greater than the gradient of a parabolic surface for a modified region located nearer the pole of the curve, the gradient variation varying continuously over the modified region, such that the gradient variation is a minimum at the maximum value of X of the modified region and the gradient variation is a maximum at the minimum value of X of the modified region.

Abstract: A clutch or brake assembly in which a hub and reaction member are, in the operative condition of the clutch or brake, coupled together through coupling discs, has one or a plurality of first coupling discs restrained against rotation relative to the reaction member and displaceable relatively thereto axially of the hub, so that it or they can be moved into engagement with one or more second coupling discs, e.g. friction discs, mounted for rotation with the hub to render the clutch or brake operative. The or each first coupling disc is located axially relatively to the reaction member in the inoperative condition of the clutch or brake by a set of spring members mounted directly on the coupling disc through a frictional gripping engagement. Where a plurality of the first coupling discs and a corresponding number of spring sets are used, the spring members of one set interconnect with the spring members of the adjacent set.

Abstract: Apparatus for detecting and signalling the presence of a dangerous gas in an atmosphere comprising means for detecting the gas and means for signalling when the gas content exceeds a predetermined level. Said detecting means and said signalling means are disposed in a common housing and connecting by a double-wire cable to a separate supply.

Abstract: A portable electric lamp including a body 1 mounting a lens 2, a lens holder 3, a reflector 5, and a bulb holder 6 is provided with a translucent diffuser sleeve 7 which has slots 8 which extend lengthwise thereof. The diffuser sleeve is coaxial with and surrounds the bulb holder and is associated with drive means 10-13 operable to effect axial movement of the diffuser sleeve relative to the bulb holder between a retracted position at which a bulb held in the bulb holder is arranged to direct a spot beam through the lens and a forward position at which light from the bulb is diffused by passage through the diffuser sleeve.

Abstract: An electric storage battery having a plurality of cell compartments separated from each other by wall means formed of thermoplastic plastics material, each cell compartment containing a plurality of plates electrically connected together, the plates of one cell compartment being electrically connected to the plates in an adjacent cell compartment by an intercell connecting rod which provides a direct connection between adjacent cells through the wall means, the rod having been embedded in position in the wall means by deformation of the wall means when the thermoplastic plastics material was softened by heat.