# US 8,770,349 B2 · Safety devices for elevators with reduced clearances > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,770,349 B2 - Document ID: US8770349B2 - Status: Granted - Kind: B2 - Application number: 13/162,692 - Filed: 2011-06-17 - Published: 2011-10-06 - Granted: 2014-07-08 - Earliest claimed: 2011-06-17 - Applicants: Yoram Madar - Inventors: Yoram Madar - Web page: https://patentgrep.com/patent/US8770349B2 ## CPC - B66B 13/285: {Toe guards or apron devices} - B66B 5/0056: {by preventing crushing} - B66B: ELEVATORS; ESCALATORS OR MOVING WALKWAYS ({apparatus for raising or lowering persons on theatrical stages or the like A63J5/12} ; funicular railbound systems with rigid ground-supported tracks and cable traction, e.g. cliff railways, B61B9/00; arrangements of ammunition handlers in vessels B63G3/00; hoists, lifts, or conveyors for loading or unloading in general B65G; braking or detent devices controlling normal movements of winding drums or barrels B66D; ship-lifting devices E02C; garages for many vehicles with mechanical means for lifting vehicles E04H6/12; hoists for feeding ammunition or projectiles to launching apparatus or to loading mechanisms F41A9/00) ## Abstract In an elevator shaft (100), preferably having an anti creeping device (140) and reduced ends, the reduced ends being the elevator pit and the elevator overhead, a load sensing safety apparatus (110) facilitated to activate the emergency safety gear of the elevator, according to teachings of the present invention, the load sensing safety apparatus including a movable plate, one or more spacing devices (120) one or more pressure sensors (150), and a locking trigger mechanism for triggering the activation of the emergency safety gear of the elevator. ## Claims ### Claim 1 In an elevator including an elevator shaft, the elevator shaft having reduced ends, the reduced ends being an elevator pit and an elevator overhead, a load sensing safety apparatus facilitated to activate emergency safety gear of the elevator, the load sensing safety apparatus comprising: a) a movable plate; b) one or more spacing devices; c) one or more pressure sensors; and d) a locking trigger mechanism for triggering said activation of the emergency safety gear of the elevator, wherein said spacing devices maintain said movable plate at a predesigned distance from a surface of the respective reduced end of said elevator shaft, the elevator being in idle state; wherein said one or more pressure sensors are operatively connected to said movable plate; wherein when pressure is applied onto said movable plate towards said surface of said respective reduced end of said elevator shaft, the force of said pressure being over a predesigned threshold value, said movable plate moves towards said surface of said respective reduced end and said one or more pressure sensors sense said pressure, thereby activating said locking trigger mechanism; and wherein said locking trigger mechanism is an arm having a first end and a second end, wherein said first end is securely attached to said movable plate, and wherein when said movable plate moves towards said surface of said reduced ends of said elevator shaft, said second end moves to operatively activate the emergency safety gear of the elevator. ### Claim 2 (depends on 1) The safety apparatus as in claim 1, wherein the elevator includes an anti creeping device and wherein said locking trigger mechanism is facilitated to activate the anti creeping device in order to activate the emergency safety gear of the elevator. ### Claim 3 (depends on 1) The safety apparatus as in claim 1, wherein upon termination of said pressure applied onto said movable plate, said movable plate returns to said distance from said surface of said respective reduced end, as in said idle state. ### Claim 4 (depends on 3) The safety apparatus as in claim 3, wherein said return of said movable plate is performed by said one or more biasing elements. ### Claim 5 (depends on 3) The safety apparatus as in claim 3, wherein said return of said movable plate is performed by the gravity force. ### Claim 6 (depends on 1) The safety apparatus as in claim 1, wherein said safety apparatus is disposed at said elevator pit. ### Claim 7 (depends on 6) The safety apparatus as in claim 6, wherein said spacing devices are biasing elements securely disposed on the floor of said elevator pit, and wherein said movable plate is disposed on said one or more biasing elements. ### Claim 8 (depends on 6) The safety apparatus as in claim 6, wherein said return of said movable plate is performed by said one or more biasing elements. ### Claim 9 (depends on 1) The safety apparatus as in claim 1, wherein said safety apparatus is disposed at an elevator ceiling. ### Claim 10 (depends on 9) The safety apparatus as in claim 9, wherein said spacing devices are holding rods securely attached to said elevator ceiling, wherein said holding rods include stoppers for holding said movable plate. ### Claim 11 (depends on 10) The safety apparatus as in claim 10, wherein said holding rods are adjustable. ### Claim 12 (depends on 9) The safety apparatus as in claim 9, wherein said return of said movable plate is performed by the gravity force. ### Claim 13 (depends on 1) The safety apparatus as in claim 1, further comprising a solenoid. ### Claim 14 (depends on 1) The safety apparatus as in claim 1 further including an electronic control unit. ### Claim 15 (depends on 14) The method as in claim 14, wherein said electronic control unit activates an alarm upon said sensing of said motion of said movable plate towards said surface of said respective reduced end. ### Claim 16 In an elevator including an elevator shaft, the elevator shaft having reduced ends, the reduced ends being an elevator pit and an elevator overhead, a load sensing safety apparatus facilitated to activate an emergency safety gear of the elevator, the load sensing safety apparatus comprising: a) a movable plate; b) one or more spacing devices; c) one or more pressure sensors; d) a locking trigger mechanism for triggering said activation of the emergency safety gear of the elevator; and e) an electronic control unit, wherein said spacing devices maintain said movable plate at a predesigned distance from a surface of the respective reduced end of said elevator shaft, the elevator being in idle state; wherein said one or more pressure sensors are operatively connected to said movable plate; wherein when pressure is applied onto said movable plate towards said surface of said respective reduced end of said elevator shaft, the force of said pressure being over a predesigned threshold value, said movable plate moves towards said surface of said respective reduced end and said one or more pressure sensors sense said pressure, thereby activating said locking trigger mechanism; and wherein said electronic control unit activates an alarm upon said sensing of said motion of said movable plate towards said surface of said respective reduced end.