A reverse input blocking clutch has a pressed member having a pressed surface on the inner circumferential surface; an input member having an input-side engaging portion arranged on the inner side in the radial direction of the pressed surface and coaxially arranged with the pressed surface; an output member having an output-side engaging portion arranged further on the inner side in the radial direction than the input-side engaging portion and coaxially arranged with the pressed surface; an engaging element arranged on the inner side in the radial direction of the pressed surface so as to move in a first direction which is a far-near direction with respect to the pressed surface; and an elastic member arranged at a position overlapping the output-side engaging portion with respect to the first direction so as to be elastically stretched between the output-side engaging portion and the engaging element.

A structure of a rotation locking device that is easily configured and capable of keeping cost down is achieved.

A rotation locking device 4 switches between a first mode where an engaging claw portion 14 engages with an engaging concave portion 9 by an output member 13 rotating an engaging member 8 due to an input member 12 being rotationally driven by an actuator 7, and rotation of a locking gear 5 supported by and fixed to an output shaft 3 of an automatic transmission 2 is restricted, and a second mode where engagement between the engaging claw portion 14 and the engaging concave portion 9 is released and rotation of the locking gear 5 is allowed.

[Problem] To realize a reverse input blocking clutch capable of suppressing looseness of an output member.

[Solution] The reverse input blocking clutch has a pressed member having a pressed surface 20 on the inner circumferential surface; an input member that has an input-side engaging portion 8 arranged on the inner side in the radial direction of the pressed surface 20, and is coaxially arranged with the pressed surface 20; an output member that has an output-side engaging portion 11 arranged further on the inner side in the radial direction than the input-side engaging portion 8 on the inner side in the radial direction of the pressed surface 20, and is coaxially arranged with the pressed surface 20; an engaging element 5 arranged on the inner side in the radial direction of the pressed surface 20 so as to be able to move in a first direction which is a far-near direction with respect to the pressed surface 20; and an elastic member 56 arranged at a position overlapping the output-side engaging portion 11 with respect to the first direction so as to be elastically stretched between the output-side engaging portion 11 and the engaging element 5.

Provided is a novel bidirectional torque limiter free from any rotational backlash between an inner race and an outer race. A first hook portion (16) of a first coil spring (6) and a second hook portion (20) of a second coil spring (10) are to be fixed by an intermediate race (8) and an outer race (12), respectively.

A backdrive braking element is provided for preventing backdrive of a shaft. It includes a poly-lobed locking mechanism including an unlock shaft that has a polygon shaped inside profile and is coupled to a poly lock drive and brake assembly. The poly lock drive and brake assembly includes a plurality of poly lock drive and brake segments and is contained within the interior cavity of a housing.

A bidirectional torque limiter between an inner race and an outer race. A first hook portion (16) of a first coil spring (6) and a second hook portion (20) of a second coil spring (10) are to be fixed by an intermediate race (8) and an outer race (12), respectively.

A rotation moment transmission device (1) for a driving device of a furniture comprises a housing (2) comprising a first friction surface (3) having a circular cross-section, a rotation moment transmission member (4) having a rotation axis (DA) and a second friction surface (5), wherein the second friction surface (5) is movable radially with respect to the rotation axis (DA) and the first friction surface (3) and the second friction surface (5) are configured to collaborate for a rotation moment transmission, and a rotation moment introduction member (6) which is rotatable about the rotation axis (DA). One of the rotation moment transmission member (4) and the rotation moment introduction member (6) comprises an engagement member, the other one thereof comprises a contact surface (8, 8′, 8″, 8‴, 8⁗) and the engagement member (7) is configured to the contact the contact surface (8, 8′, 8″, 8‴, 8‴′) such that a twisting of the rotation moment introduction member (6) relatively to the rotation moment transmission element (4) moves the second friction surface (5) with respect to the rotation axis (DA) radially towards the first friction surface (3) or away therefrom.

The reverse input cutoff clutch includes: a pressed member having a pressed surface around the inner peripheral surface; an input member coaxially arranged with the pressed surface and having an input-side engaging portion arranged on the radially inner side of the pressed surface; an output member coaxially arranged with the pressed surface and having an output-side engaging portion arranged further on the radially inner side than the input-side engaging portion; and an engaging element arranged so as to be movable in a first direction as a direction toward or away from the pressed surface on the radially inner side of the pressed surface. The engaging element has a main engaging element body having a pressing surface and a pivot-support shaft, and a link member. The link member has a first end portion pivotally linked to the pivot-support shaft, and a second end portion pivotally linked to the input-side engaging portion.

A one-way damping structure (1), comprising a spring (11), a drive element (12) and a friction force generation member, the spring (11) and the drive element (12) being connected such that the spring (11) is driven by means of the drive element (12); the spring (11) comprises a fixing portion (111), a connecting portion (112) and an annular portion (113), the connecting portion (112) being located between the fixing portion (111) and the annular portion (113) and connecting the fixing portion (111) to the annular portion (113), and the fixing portion (111) being fixed; and the annular portion (113) comprises at least half a turn for defining a spring opening which spirally extends in the circumferential direction, and slides relative to the friction force generation member so as to generate friction torque. Also disclosed is an adjusting assembly which comprises the described one-way damping structure (1). A seat height adjuster utilizes one-way damping properties in which the spring (11) of the one-way damping structure (1) generates different torques in different rotation directions; moreover, in combination with a traditional output structure (2) and an installation structure (3), a driver (4) continues to stably defy a fixed load so as to work when the seat is adjusted downwards under the load, and the lifting ability is unaffected when the seat is adjusted upwards.

Provided is a novel bidirectional torque limiter, which allows setting a slip torque for a case of inputting rotation from a driving part to be smaller than a slip torque for a case of inputting rotation from a driven part. The force of an external coil spring 42 to clamp an outer race 8 is set smaller than the force of an internal coil spring 48 to clamp an inner race 10, so that the external coil spring 42 increases its diameter to slip with respect to the outer race 8 when a rotation torque is applied from the driving part, while the internal coil spring 48 increases its diameter to slip with respect to the inner race 10 when a rotation torque is applied from the driven part.