1. Backflow preventer, especially for installation in a domestic water pipe having a backflow-preventing valve (22, 23, 10), which is arranged between a fresh water inlet pipe support (2) and a fresh water outlet pipe support (3), as well as with an outlet valve (27) for waste water arranged between the fresh water outlet support (3) and an outlet opening (35) for waste water, so that one of the t...

Compounds of formula wherein R<1> is hydrogen, hydroxy or methoxy, R<2>, R<3> and R<4> independently are C1-C5 alkyl; R0 is C1-C10 alkyl, benzyl or CH2R<6>, in which R<6> is C2-7 alkenyl or C3-C6 cycloalkyl, the pharmaceutically acceptable acid addition and quaternary piperidinium salts thereof, are potent analgesics. Pharmaceutical formulations containing such compounds, a method for ...

This device, which is intended to brake a wheel of a vehicle rotated by a drive shaft carrying at its free end an epicyclic train reducer housed in a casing, is characterized in that it is fixed on the outer face of the bottom of the casing and comprises a watertight case enclosing at least one friction disc interlocked in rotation with the sun wheel of the reducer, as well as an annular plate for...

A sliding contact for a toy rail vehicle has a body part having a convex slide face and a depression which is provided in the convex slide face and arranged so as to form on the latter an edge by which said slide face linearly contacts with a current-conductive rail and which removes extraneous particles from the current-conductive rail during sliding over the latter. The depression may have a cir...

A slatted blind for openings in walls, in particular for trapezoidal windows, is proposed, the upper frame side (15) of which runs obliquely in relation to the horizontal. The slats (25, 28 to 31) of the blind are held in cord ladders and can be gathered by pull cables (17, 18) fastened on a horizontal end strip. All the slats (25, 28 to 31) are, corresponding to the oblique, upper frame side (15)...

Basic-oxygen steels containing a high, controlled level of nitrogen are made by:

Arranged in sandwich configuration in the upper part of a device housing (1) is a support layer (4) of a good heat-radiating material. Situated on the inner side of the support layer is an electrically conducting heating film with pad electrodes (9), to which an electricity lead (10) is connected. The heating film is formed by applying a plastic dispersion with added carbon black onto the support ...

A bitumen primer layer (5) is applied to a base sheet material (1) and while the bitumen primer layer (5) is still wet a layer of a barrier material (6) of a consistency composition and thickness is applied to the primer layer (5) such that the bitumen primer layer (5) does not bleed through the barrier layer (6) and the barrier layer (6) adheres to the bitumen primer layer (5). A coating of stone...

The fastener comprises two fastener members, one of which consists of a tension strap and the other of a strap retainer. One of the fastener members is provided with teeth, which are interengageable with a tensioning lever, which is associated with the other fastener member. Strap-restraining means are also provided, which comprise a locking pawl that is mounted on said other fastener member and c...

A signal delaying circuit is coupled to a source of television video signals. A plurality of signal coupling circuits are coupled to the signal delaying circuit for developing a plurality of delayed video signals. At least a first and a second of the delayed video signals, spaced apart in time by a time interval substantially equal to NT/2, where T is the period of a signal component of the video ...

Over-center hinge for cabinet doors, having two hinge links pivotingly joined, in the manner of a quadruple knuckle joint, at one end to a door-related hinge member and at the other end to a wall-related hinge member in the form of an elongated supporting arm, which, in the swing from the closed to the open position, can be moved through a dead center position on one side of which it is biased by ...

An hydraulically controlled variable deflection roll of the type applying the deflection force between the fixed shaft and the rotative shell via piston and cylinder arrangements, as to each of the arrangements uses a large number of pistons of smaller diameter.

A process for purifying the exhaust gases from industrial furnaces and especially from waste incineration plants is described in which process the exhaust gases which contain acid, neutral and/or basic pollutants in the gaseous or solid form or in the form of a mist, are treated in an evaporative cooler 1 and then in a dry purifier 2, in which they are freed from at least a substantial portion of ...

A hay making machine has a rake that rotates on an upwardly extending axis and an outer circumference defined by a felly or rim to which elongated crop working elements are connected. The elements can be tines or flexible strips that are pivotally or flexibly associated with the felly or rim so that the elements respond to ground undulations or a control device and pivot or otherwise deflect. In o...

1. Piston for lifting cylinder-internal combustion engines, wherein at least one annular or curved element is attached outside on the basic body of the piston shaft and between said element and said basic body a resilient layer is placed, characterized in that said resilient layer is formed by a viscous-elastic adhesive (3 ; 3a) as sole connection between said element (4 ; 4a) and said basic body ...