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

Claim 27:
28. 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 a retaining device is provided for retaining the support rolling elements against the movement radially to the outside in the blocking position of the blocking unit; and
wherein the retaining device has a retaining member assigned to a radially outer support rolling element of each respective support-rolling element group, which retaining member is movable between a retaining position retaining the assigned support rolling element and a non-use position.