Abstract: A linearly operating motor for stepwise advance of a driven member (11), such as a shaft, comprises an elongated body (10) with length variable properties, and means (15) for changing the length of said body (10). The driven member (11) is provided with at least one locking member (12), whereby at length increase of said body (10) the locking member (12) is arranged, by means of said length increase, to be brought into engagement with said driven member (11) and said body (10) is adapted to act upon the locking member (12) in such a manner the locking member and the driven member (11) are displaced at length increase of the elongated body (10).

Abstract: A device for securing a first machine part to a second machine part having a first contact surface and a second contact surface. The first contact surface has at least one external sleeve portion. A threaded locking member cooperatively engaging the sleeve portion is actuatable relative to the sleeve portion to frictonally engage the first and second contact surfaces.

Abstract: A rotatable element is arranged on a supporting member. The element is freely rotatable and displaceable radially by being held in position by two portions attracting each other, said portions being made of magnetic material, and that a plane slot separates the supporting member and the element. The driving of the element can be effected thereby that the element forms or incorporates a rotor in an electromotor, the stator of which is arranged in an area of the supporting member.

Abstract: A rotary machine, such as a hammer drill, comprises a tool-carrying shaft (12), which is rotatably supported in the machine housing (11) by means of a ball bearing (24). The outer race ring (25) and the inner race ring (26) of the bearing are axially secured in the housing (11) and on the shaft (12) respectively. In order to make possible a limited axial movement of the shaft (12) relative to the housing (11) one of the race tracks (27) of the inner race ring (26) and the outer race ring (25) is formed cylindrical.

Abstract: Superparamagnetic liquids comprising:(A) magnetic particles in stable colloidal suspension; (B) an A-X-B dispersant wherein A is derived from a non-ionic surface active agent, B is a carboxylic acid group and X is a connecting group between A and B; and (C) a carrier liquid which is a thermodynamically good solvent for A but which does not form a stable superparamagnetic liquid with magnetic particles coated only with oleic acid.

Abstract: A device for providing sideward displacement of a vehicle having vertically adjustable members such as a forklift truck, comprising at least one displacement member attached to said vertically adjustable member, said displacement member being pivotably movable from an active position to an inactive position, said device including a pedal to move the displacement member from said inactive position to said active position upon raising said adjustment member to a raised position, whereby lowering of said adjustable member causes contact of said displacement member with the ground, and whereby continued lowering of the adjustable member permits pivoting of the displacement member towards its inactive position to simultaneously displace at least a portion of the vehicle in a sideward direction.

Abstract: The invention refers to a seal for bearing spaces, wall channels for shafts and the like, where the seal is fitted to the shaft. The seal is characterized in that it incorporates a sheet metal strutting projecting radially outwards, and on the side facing away from the space intended to be sealed off being equipped with mainly radially extending vanes, the radial extension of which mainly coincide with the radial extension of the sheet metal strutting.

Abstract: In a rear view mirror intended primarily for mounting on a motor vehicle, the specular surface in order to obtain a limited transverse extension, is divided into at least two separate parts (4, 5), which are displaced relative each other, thus that they are situated in different planes.

Abstract: A device for attachment of a machine member to a shaft, whereby the machine member has an opening for said shaft. The opening has on one hand surface portions of a shape corresponding to the shape of the shaft, cylindrical or tapering, and on the other hand, surface portions having a shape corresponding to the shape of the clamping surfaces of a clamping sleeve, for allowing optional attachment of the machine member directly on the shaft or by means of the clamping sleeve.

Abstract: A device for use in explosive welding of two overlapping tubular or annular elements (1, 2) by an explosive charge (3). The explosive charge (3) is located in the hold of the one element (1) in front of the overlapping portion of the other element (2). The elements (1, 2) are surrounded by an annular dolly comprising a plurality of segments (4) which are individually radially movable and associated with braking means. Each segment (4) is provided with a plurality of frictional surfaces (5, 6, 7, 8) which extend radially relative to the dolly and are adjustably forcable against opposed frictional surfaces on a supporting means (9), which bridges the dolly. A device according to the invention absorbs energy efficiently and can be re-used several times without requiring adjustment or replacement of parts incorporated therein.

Abstract: In a device for bringing about rotational braking in a screw and nut device incorporating a nut, which is rotatable and displaceable relative to a threaded bar, and a helical spring enclosing the bar, which spring at braking is clamped against the bar, for effecting a big braking moment and a small wear in the thread of the bar, there is arranged a helical element with a loose fit in the thread groove of the bar, which element extends radially outside the thread flank tip. The helical spring is futhermore arranged with radial pretension of the thread flank tip between the winding turns of the helical element.

Abstract: A device for securing a first machine element to a second machine element comprising a clamping sleeve disposed between said machine elements having first and second opposed clamping surfaces forming opposing angles .alpha. and .beta. with the axis of said sleeve, one of the machine elements having complementary clamping surfaces confronting and engaging said first and second clamping surfaces, the angles (.alpha., .beta.) formed between the sleeve axis and said opposed clamping surfaces being smaller than the friction angle in each associated clamping contact whereby relative rotation of said sleeve and one of the machine elements produces a clamping action over substantially the entire length of said sleeve.

Abstract: The invention relates to a driving wheel for car engines or the like, incorporating a gear wheel, which is intended to cooperate with a cogged belt, and a pulley attached to one side of the gear wheel and arrested to this. The gear wheel molded from a plastic or similar material having a coefficient of thermal expansion higher than steel's coefficient of thermal expansion and by having a helix of steel or another material with a coefficient of thermal expansion similar to or identical with that of steel embedded in the gear of the wheel radially inside the cogs, whereby the helix has such strength and dimension that it determines the thermal expansion properties of the gear rim.

Abstract: The invention relates to a gear wheel consisting of plastic material or a similar material having a coefficient of thermal expansion higher than that of steel. The gear wheel further includes a helix of steel or another material having a coefficient of thermal expansion similar to or identical with that of steel embedded in the gear rim of the wheel radially inside the teeth, whereby the helix has such a strength and dimension that it determines the coefficient of thermal expansion of the gear rim.

Abstract: In a device for producing self-locking properties of a screw and nut device the nut co-operates with a torque-transmitting part which is rotatable in relation to the nut. Torque is transmitted via a portion on the torque-transmitting part, which portion is arranged in a space between two opposing surfaces on the nut. A helical spring is arranged in a thread around a threaded shaft and has an end portion inserted into the space. The helical portion of the spring has a loose fit in the thread when the nut is driven by the part, whereas the spring is contracted against the shaft when the end portion contacts one of the opposing surfaces of the nut and thereby brakes the rotation if the nut tends to be rotated by an axial load on the nut and the part is disconnected.

Abstract: The invention relates to a gas bearing with a bearing surface arranged on a gas permeable element to which a pressure medium can be supplied from an external source. The bearing surface is arranged on a less permeable surface layer, through which holes are made. In order to ensure good gas flow through the holes, the holes extend into the porous material a distance corresponding to at least half the diameter of the holes, and those portions of the holes which are situated inside said surface layer are limited by porous material.

Abstract: A clamping ring, intended to enclose and exert a clamping force against a cylindric element and incorporating a slot and a clamping means enclosing the slot, is provided with stepladder-shaped surface elements on each side of the slot, for making possible a compact design and favorable force absorption in the clamping means, whereby the clamping means is composed by several separate sections, enclosing one step each.

Abstract: A seal comprising a gap between e.g. a flange (5) on a shaft and an element (6) arranged in a surrounding housing (2) is used for separating a fluid in a space (3) in the housing from the space (4) surrounding the housing. A pressurized fluid is supplied to the gap via a conduit (8) and a pocket (7) and flows to the space (3) and the space (4). The gap tends to be closed by the fact that the element (6) is elastically supported in the housing (2) by ductile membranes (10,11) and is pressed against the flange (5) by the pressure in the space between the membranes.

Abstract: A freewheel device with freewheeling and locking effect in both directions of rotation can be produced easily and inexpensively by the use of conventional sprags designed for use in uni-directional freewheel devices. Two sets of sprags are provided between the inner and the outer raceway of the device, one for each direction of rotation. The sprags are spring loaded for taking positions in which they do not contact one raceway, and a cage which is braked during rotation is provided to be brought in rotation by the sprags and thereby influence the sprags against the spring force to taking a position in which they contact both raceways, the two sets of sprags being alternately engaged or disengaged depending on the direction or rotation of the device.

Abstract: In a constant velocity joint having an inner and an outer part with opposite grooves in which are arranged rolling bodies guided by a retainer, the grooves and/or the rolling bodies are provided with a friction coefficient increasing surface layer in order to give reduced contact stresses between rolling bodies and retainer.