A positioning apparatus for positioning a tactile or optical roughness sensor, a probe or some other measuring instrument with respect to a workpiece can be secured to a movement device of a coordinate measuring machine. The positioning apparatus has a drive that produces a relative movement between two parts of the positioning apparatus, and an inhibiting device, which inhibits the relative movement between the two parts. For this purpose, the inhibiting device has a first friction element and a second friction element each having unlubricated friction surfaces. The friction surfaces are pressed against one another with a normal force that is not variable during the operation of the positioning apparatus. A coefficient of sliding friction that is less than 0.15 acts between the friction surfaces in the case of dryness and without lubrication. Typically, the inhibiting device is arranged in a flexspline of a strain wave gearing.

Disclosed herein is a washing machine including a damping device to be operable according to vibration displacement. In a washing machine including a damping device provided to damp a vibration transferred from a washing tub, the damping device includes a suspension member, a damping unit provided to move along the suspension member, and a friction unit provided in the damping unit to form a frictional force with the suspension member, and the friction unit is disposed while being spaced apart from an inner surface of the damping unit to be selectively movable depending on a level of the vibration of the washing tub.

One end portion of a rod member is accommodated in a housing which is connected to one bracket BR1, and the other one end portion is connected to the other bracket. Between the one end portion of the rod member and the housing, there is disposed a biasing mechanism which biases against forces that enlarge and shorten an axial distance between the brackets. Furthermore, a friction mechanism, which presses the housing in a direction perpendicular to an axis of the rod member, is accommodated in the housing. The friction mechanism comprises a pressing member which is supported on the rod member to be in contact with an inner surface of the housing, a spring member and an adjusting member, so that a pressing force of the pressing member to the housing by the spring member is adjusted by the adjusting member.

Example embodiments provide mechanical dampers. The mechanical dampers may be applied to dissipate energy in a structure that arises for example from a dynamic load such as seismic activity, vehicle impact, vibration of the structure, wind forces, an explosion, etc. The damper comprises a pair of clamping plates. A shear plate is held between the clamping plates. The shear plate is movable in transverse directions relative to the clamping plates. The damper also comprises a conical wedge coupled between one of the clamping plates and the shear plate. The conical wedge comprises a female conical element and a male conical element that projects into a conical indentation of the female conical element.

The shock-absorbing buffer pad comprises an external compression body, an internal guide slot and an inserted adjusting component. The external compression body has a top part, a bottom part and a compression elastic component. The top part is configured with an inserting hole. The bottom part is located beneath the top part. The compression elastic component is connected between the top part and the bottom part. The compression elastic component has a folding part. When the top part is pressed, the compression elastic component will accumulate an inverse elastic force. The internal guide slot is formed on the bottom part of the external compression body and located inside the internal space of the external compression body. The internal guide slot has an inserting slot exposing upward. The interior of the inserting slot is formed with a stopping block. The inserted adjusting component has an inserting cylinder, which can be inserted into the inserting hole. The top surface of the inserting cylinder is positioned outside the inserting hole. The bottom part of the inserting cylinder is divided into multiple abutting walls corresponding to the stopping block.

A method and a device for damping relative motion between structural elements (4a, 4b, 5), and in particular for damping oscillations in a stay cable of a building or a civil engineering structure. A damping device is disclosed which provides motion damping by means of frictional engagement (1a, 1b) between friction surfaces composed of low-friction polymeric material (2a, 2b, 3a, 3b). The polymeric material preferably includes a dispersed lubricant. The use of low friction polymers results in a constant damping which is effective over a broad range of displacements and forces.

A positioning apparatus for positioning a tactile or optical roughness sensor, a probe or some other measuring instrument with respect to a workpiece can be secured to a movement device of a coordinate measuring machine. The positioning apparatus has a drive that produces a relative movement between two parts of the positioning apparatus, and an inhibiting device, which inhibits the relative movement between the two parts. For this purpose, the inhibiting device has a first friction element and a second friction element each having unlubricated friction surfaces. The friction surfaces are pressed against one another with a normal force that is not variable during the operation of the positioning apparatus. A coefficient of sliding friction that is less than 0.15 acts between the friction surfaces in the case of dryness and without lubrication. Typically, the inhibiting device is arranged in a flexspline of a strain wave gearing.

The present invention relates to a shock absorber structure with variable damping, comprising an outer tube, a piston, a shaft, a plurality of spring sets, a cushioning piston cover set, an inlet regulating bolt, and a damping regulating bolt, wherein the outer tube is filled with damping oil. The shaft drives the piston by moving to the upper dead center to produce a primary damping of cushioning, and the cushioning piston cover set and the inlet regulating bolt produce a secondary damping of cushioning to achieve the effect of variable damping. When the shaft reaches the lower dead center, the spring set rebounds and pushes the cushioning piston cover set and the piston for displacement to achieve the cushioning state with variable damping and improve the overall shock absorption and cushioning effect.

A frictional device for a frictional damper comprises a friction lining carrier, at least one adjustable friction lining arranged on the friction lining carrier and an adjustment element for adjustably arranging the at least one friction lining on the friction lining carrier.

One end portion of a rod member is accommodated in a housing which is connected to one bracket BR1, and the other one end portion is connected to the other bracket. Between the one end portion of the rod member and the housing, there is disposed a biasing mechanism which biases against forces that enlarge and shorten an axial distance between the brackets. Furthermore, a friction mechanism, which presses the housing in a direction perpendicular to an axis of the rod member, is accommodated in the housing. The friction mechanism comprises a pressing member which is supported on the rod member to be in contact with an inner surface of the housing, a spring member and an adjusting member, so that a pressing force of the pressing member to the housing by the spring member is adjusted by the adjusting member.