Abstract:
A percussion mechanism that has a motor, a drive piston which can be moved to and fro in a guide cylinder by the motor, and a percussion piston. A coupling device is active between the drive piston and the percussion piston, via which coupling device the movement of the drive piston is transmitted to the percussion piston. The motor can be configured as a reluctance motor or as a synchronous motor. The motor can be actuable in such a way that different rotational speeds of the rotor can be generated within a percussion cycle and/or from percussion cycle to percussion cycle.
Abstract:
A percussion tool has a cooling air channel for guiding a cooling air flow from a cooling air fan to an outside wall of a cylinder of an internal combustion engine. The cooling air channel is tapered to the extent that partial cooling air flows guided between the respective cooling fins are branched off the main cooling air flow. In such a way, the flow rate of the cooling air flow in the cooling air channel remains substantially constant, resulting in optimized engine cooling. The cooling air channel may be divided into two cooling air channels downstream of the cylinder. One of the cooling air channels guides cooling air to an exhaust gas system of the internal combustion engine, while the other cooling air channel guides cooling air to an outside wall of the guide housing of a hammer mechanism.
Abstract:
The invention relates to a hammer and/or hammer drill acting as a breaker, having a drive, a hammer mechanism driven by the drive, and a crank device disposed in the force flow path between the drive and the hammer mechanism and coupled to an element of the hammer mechanism for transforming a rotary motion of the drive into an oscillating translation motion of the element of the hammer mechanism. A collecting device for collecting lubricant is provided above the hammer mechanism relative to a vertical operating position. The collecting device may be a collecting tank open at the top and defined by a partition of the housing and a separating floor. A connecting rod of the crank device may extend through a cutout in the separating floor. Lubricant collects above the separating floor can be delivered again and again into the interior of the housing by a delivery element.
Abstract:
A friction clutch wherein the diaphragm spring has two sets of inwardly extending prongs which are axially spread apart by the marginal portion of an axially movable release plate serving to disengage the clutch by pivoting the diaphragm spring relative to a plate-like carrier on the crankshaft of the engine in a motor vehicle to thereby relax the bias upon a pressure plate which normally presses a clutch disc against a counterpressure plate connected to the carrier. The coupling between the marginal portion of the release plate and one set of the prongs is a bayonet lock type connection which can be disengaged by turning the release plate relative to the diaphragm spring against the opposition of male and female detent members to thereby move each prong of the one set into register with a discrete opening in the marginal portion of the release plate. The release plate stresses the two sets of prongs and is clamped between them when it is turned in a direction to move the prongs of the one set out of register with the corresponding openings. At such time, the prongs of the one set move along sloping ramps which guide them into engagement with convex abutments at one side of the release plate. The other side of the release plate has convex abutments for the prongs of the other set.
Abstract:
The clutch plate of a friction clutch in a motor vehicle has a first damping unit whose input element carries the friction linings and whose output element is a first hub having a radially outwardly extending first flange, and a second damping unit whose input element constitutes the input element of the first damping unit and whose output element has a second hub surrounding a portion of the first hub and having a second flange extending radially outwardly therefrom. The first damping unit has first coil springs in registering openings of the first flange and the input element, and the second damping unit has second coil springs in registering openings of the input element and second flange. The springs of the first unit oppose rotation of the linings relative to the first hub during a first stage of angular movement of the input element relative to the first hub, and the springs of the second unit cooperate with the springs of the first unit to yieldably oppose further rotation of the linings relative to the first hub. The extent to which the springs of the first unit alone oppose rotation of the linings relative to the first hub is determined by the circumferential play between the external teeth of the first hub and the internal teeth of the second hub.
Abstract:
Vinyl polymers with acetylacetoxy groups form the basis of polymer dispersions which are used as binding agent dispersions in paints, particularly suitable vinyl polymers are obtained by polymerizing an acetylacetoxy compound together with a least one further olefinically unsaturated compound, while using as acetylacetoxy compound an allyl ether derivative of the formula ##STR1## The copolymerization is carried out in particular in emulsion at a temperature in the range of from -30.degree. to 200.degree. C. As comonomers there are used especially vinyl esters and (meth-)acrylic acid esters. The polymerization is commonly effected in the presence of a radical-forming initiator and optionally in the presence of emulsifiers and protective colloids.
Abstract:
The wet adhesion of plastics dispersions and of paints made therewith is widely improved, if in the manufacture of the dispersions a glycidyl ester of an olefinically unsaturated carboxylic acid in an amount of 0.5 to 10% by weight calculated on the total amount of monomers is copolymerized, and the dispersion so obtained is reacted with ammonia at a temperature of at least 50.degree. C.
Abstract:
An implement having a drive, a drive element that may be driven by the drive and that is disposed in an axially moveable manner and is coupled to the drive element, and an overrunning clutch disposed in the drive or in a torque flux between the drive and the drive piston. If the drive has a movement that is slower than that of the drive element, the overrunning clutch is in an idle state, in which the clutch interrupts the torque flux between the drive and the drive element, thus decoupling the movement of the drive element from the drive torque of the drive. In this manner, the drive element may move more rapidly, for example during the return movement thereof, than would correspond to the movement forced by the drive.
Abstract:
The invention relates to an impact device, having an internal combustion engine and an impact mechanism driven by the internal combustion engine. An engine lubricating device supplies lubricant to the internal combustion engine. An impact mechanism lubricating device lubricates the impact mechanism accordingly. For this purpose, the engine lubricating device and the impact mechanism device partially comprise the same components.
Abstract:
Production of low-emission dispersion paints, coating materials and synthetic resin dispersion plasters in the form of aqueous preparations based on aqueous synthetic resin dispersion copolymers derived from olefinically unsaturated monomers, having a pigment volume concentration (PVC) of at least 60% and containing water, fillers, pigments, synthetic resin dispersion copolymers and conventional auxiliaries, wherein the synthetic resin dispersion copolymers have a content of 0.05 to 2% by weight of monomer units derived from special unsaturated hydrolyzable organic silicon compounds and the aqueous copolymer dispersions possess a minimum film-forming temperature (MFT) of