Explore the jaws, central spreader and upper connection of the stone lifter illustrated in patent US884198A. Select a component to identify it in the fixed schematic; this viewer does not calculate lifting capacity.
Lewis Stone Lifter Patent Component Viewer
Select one of five illustrated components to highlight it in a fixed section. The viewer provides no load, clamp, grip, socket, rigging or safety calculation.
Equation Used
- The drawing is a simplified patent-topology map rather than a manufacturing or rigging drawing.
- The selected component pulses only for identification; the assembly does not demonstrate a lift.
- The patent establishes qualitative relationships but not a universal geometry or rated capacity.
- No socket dimensions, material properties, contact areas, stone condition or manufacturer load table are supplied.
- Equipment selection, socket preparation, rigging, inspection, operation and safety conclusions are excluded.
The spreader acts between two jaws within the stone socket. Component highlights explain that arrangement without demonstrating a lift or assigning a load rating.
How the jaws and spreader connect
US884198A describes a central wedge-shaped spreader that slides relative to jaws and expands their acting faces into a stone socket. The patent also shows an upper connection used after the members engage.
The viewer identifies those relationships without reproducing dimensions, forces, materials or a lifting procedure.
Historical mechanism study only
This page can help identify components in the cited patent. It cannot select, size, rate, inspect or approve a lifting accessory or stone socket.
Any real lifting work requires a manufacturer-rated device, applicable lifting-accessory requirements and a competent lift plan.
A five-item legend, not a force formula
The component legend identifies parts. It supplies neither the contact geometry nor material data needed for force or grip calculations.
How to read the map
Select component 1 for the socket boundary, 2 for the left jaw, 3 for the right jaw, 4 for the central spreader, or 5 for the upper connection. No selection represents an operating step or safe configuration.
Why dimensions and load ratings matter
Mass, wedge angle and a generic friction coefficient cannot establish stone breakout, jaw stress or contact pressure. A lifting-capacity assessment needs the actual device, socket and stone condition.
Use equipment-specific ratings and instructions for any lifting application.
Lewis component-map questions
Does this calculate a safe lifted mass?
No.
Does it prove self-locking or grip capacity?
No.
Are the socket and parts dimensioned?
No; the drawing is schematic.
Can it guide socket cutting or lifting?
No.
Patent reference
- US884198A, Stone lifter: jaw, central spreader, stone-socket and upper-connection relationships used in the component map.
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