Abstract:
In the Prior Art, a higher-ranking mechanism controls the standby circuiting of assemblies in 1:N redundancy, resulting in a system dynamics loss. The invention solves this problem in that the devices responsible for the standby circuiting events in the higher-ranking mechanism are relocated into a standby circuit assembly of the 1:N redundancy provided for standby circuiting purposes. The standby circuit events are thus controlled and monitored by the standby circuit assembly itself, relieving the higher-ranking mechanism of these tasks.
Abstract:
The invention is directed to a method and apparatus for controlling the speed of an electronically controlled drill, hammer-drill or rotary hammer driven by an electrical motor wherein the rotational speed is first raised from zero to a predetermined start-drill speed and thereafter, from the start-drill speed up to the working speed. The rotational speed is held automatically at the start-drill speed for a predetermined time interval. The speed of the motor is sensed by a speed sensing device which includes a magnet ring coupled to the output shaft of the motor and a sensor positioned adjacent the periphery of the magnet ring. The speed control circuitry of the invention is housed within a casing which includes a depending portion for supporting the sensor in the proper operative position relative to the magnet ring.
Abstract:
A coffee percolator having a brewing chamber wherein at least one of the boundary wall surfaces of the brewing chambr is adjustable transversely of the direction of flow of the hot water through the coffee powder so that the thickness of the coffee powder bed in the direction of flow may be kept substantially constant for the coffee charges of varying size. The coffee percolator may include a brewing sieve having a support sieve with openings of a size exceeding the dimensions of the ground coffee particles and a fine sieve supported on the side of said support sieve facing towards the brewing chamber and having openings of a size smaller than the dimensions of the ground coffee particles.
Abstract:
The invention relates to a solenoid valve, particularly for controlling the brake pressure of a wheel brake of a slip-controllable hydraulic brake system of a motor vehicle. In known solenoid valves, there is a first hydraulically effective connection of an armature chamber of the solenoid valve to an outlet through the guide of a tappet in a valve insert. The first hydraulically effective connection ends in the form of a blind hole and thus does not permit flushing out gas bubbles which possibly have accumulated in the armature chamber. In order to solve this problem, the invention proposes a second hydraulically effective connection which is arranged away from the guide of the tappet, uncoupled from the first hydraulically effective connection. Thus, a closed pressure medium path is effected within a valve cartridge of the solenoid valve, the closed pressure medium path making possible an effective flushing of the armature chamber and thus a flushing out of gas bubbles.
Abstract:
The communication device (KE) has a coupling arrangement (ASN) with at least a number N of active line assemblies (BG 1 to BG N), which are respectively connected to a transmission line (LTG 1 to LTG N) and, together with an additional standby line assembly (BG N+1), form a “1:N” redundancy group. In such a “1:N” redundancy group, line-specific switches (S) and selection devices (SEL 1:N) are designed and arranged in such a manner that the selection devices can be replaced without adversely affecting the normal operation of the communication device.
Abstract:
A vibration damping arrangement for improving the structure-borne noise isolation of a hydraulic unit forming part of a slip-controlled brake system from a vehicle. The hydraulic unit is supported elastically on the vehicle, below its center of gravity, on three rubber spring elements. In this arrangement, the rubber spring elements are situated both in front of and behind a vertical projection of the center of gravity and symmetrically in and on both sides of a vertical plane passing through the center of gravity. In addition, the three rubber spring elements are arranged along the lateral surface of an imaginary circular cylinder, on the horizontally extending longitudinal axis of which the center of gravity of the hydraulic unit lies. The rubber spring elements are formed of disk springs, the ends of which, carry fastening elements, extend approximately tangentially to the lateral surface of the imaginary circular cylinder.
Abstract:
The safety helmet has a viewing opening which can be covered by a visor. Several vent openings and air passage openings are arranged at the chin protector of the safety helmet. Such openings terminate together into an air-collecting chamber provided on the inside of the chin protector. Two ventilating tubes extending to the top edge of the viewing opening lead away from this air-collecting chamber. An air stream produced by a pressure head passes through the vent openings--as well as through the air passage openings if the visor is opened somewhat--into the air-collecting chamber and is conducted by the ventilating tubes onto the inside of the visor, thereby substantially preventing any fogging of the visor by moisture precipitation.
Abstract:
In a portable power tool, two switches are provided in the handle for respectively effecting rotation of the electric motor in opposite directions. Each switch has a center contact movable between a rest contact and a working contact, the armature of the motor being connected between the two center contacts. Preferably, a common rocker actuates the two switches individually or jointly. In both the rest position of the two switches and in the case when both switches are jointly actuated, intentionally or unintentionally, the armature is short-circuited and braking occurs. Two platelets of electrically conductive synthetic material may advantageously be used as end stops for the switches so that the speed in either direction of rotation is controlled by the pressure of the operator's finger on the selected switch.
Abstract:
In a method for operating an hydraulic brake system in a vehicle, which has at least two electrically actuable hydraulic valves, the hydraulic valves are energized at a different current intensity at least intermittently in order to heat the hydraulic fluid during a heating period.
Abstract:
Described is a coffee machine (1) comprising a brewing member (5, 5′), a support surface (15) for ground coffee and a member (3, 6, 7) for applying water to the ground coffee, in which it is possible to level off the ground coffee positioned on the support surface (15) in a constructionally simple and generally applicable manner to obtain a layer having a substantially uniform thickness. To this end there is provided a member (22, 24, 25, 122, 222, 322) which guides water in a purposefully non-uniform manner over the ground coffee such that the ground coffee is distributed over the support surface (15) in a layer having a substantially uniform thickness.