Patent ID: 11873920
Assignee: SHELL USA, INC.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 28:
29. A safety device for detachably locking an output member of a linear drive comprising:
a coupling rod that can be coupled with the output member of the linear drive, whereby the output member is movable by means of a stroke of the coupling rod,
a housing penetrated linearly movably by the coupling rod,
a blocking unit penetrated linearly movably by the coupling rod which is relatively movable with respect to the housing between a locking position blocking the stroke of the coupling rod and a release position enabling the linear movement of the coupling rod,
a spring device for prestressing the blocking unit in the blocking position,
a locking device for locking the blocking unit in the release position, wherein the locking device has support rolling elements accommodated in the housing and a support sleeve penetrated linearly movably by the coupling rod wherein the support sleeve is movable between a support position, in which the support rolling elements are held radially to the outside with the blocking unit in locking position and a release position, allowing a retracting of the support rolling elements radially to the inside, out of the engagement with the blocking unit,
an electromagnet device which, when energized, holds the support sleeve in the support position against the recoil force of at least one trigger spring of a trigger spring device, in such a way that in the event of a power failure, the holding function can be reversed and the support sleeve is moved to the release position by means of at least the one trigger spring, thereby allowing the blocking unit to be transferred to the blocking position by means of the spring device,
wherein the support sleeve has an outer wall on which a support sleeve receiving space is formed which acts together with the receiving space of the blocking unit in the support position, in which support sleeve receiving space a support roller element is immersed both in the support position as well in the release position of the support sleeve; and
wherein the inner support roller element can move upwards with the support sleeve when the support sleeve transitions from the support position to the release position, and wherein the inner support roller element can move downwards with the support sleeve when the support sleeve transitions from the release position to the support position when the inner sleeve portion comes in contact with the upper end of the support sleeve.