SAFE JACK

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SAFE JACK

• Concept Designs Update and Patent Search

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Last Week Deliverables

• Conceptual Designs with PM Evaluation
• Plus and minus evaluation needed improvement.
• Some drawings needed to be redrawn.

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This weeks deliverables

• Improved Concept Design with PM evaluation
• Patent/Product search relating to Safe Jack
  concept

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Improved Concept Designs

• Narrowed designs down to seven.
• Added a PM evaluation.
• Added a new concept design.

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Hydraulic Stop

• Compact, installs underneath jack.
• Forces are in one direction, linear.
• Larger forces due to mechanical advantage of
  location.
• Small number of lock points.

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Locking Arm with Track

• Easy modification to jack assembly.
• Good amount of stop points.
• - Release mechanism would require large range of
  motion.

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Gear Latch System

• Compact design.
• Easy design for release
• mechanism.
• Could gear it to reduce
• forces.
• Large point forces on
• gear teeth.

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Finger Latch System

• Compact design.
• Easy modification to jack assembly.
• Could cause large bending moment on support
  arm.
• Disengaging all fingers at once would be
  difficult.

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The Replacement

• Good range of lockability.
• Easy release.
• Requires modification to major support
  structure.
• Large force/moment on arm.

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Catch and Release

• Good range of lockability.
• Can adapt to changing heights.
• Large range of motion required for release
  mechanism.

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Jack Stand Jack

• Good range of lockability.
• Force will always be in one direction.
• Can adapt to changing heights.
• Complex release mechanism.
• External attachment.
• Pin connections need to be substantial.

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Related Patents/Products

• Ratcheting Mechanical Jack
• Piston Block Jack
• Lift Block Jack
• Lift Block 2 with pin Jack
• 4-Post Lift Lock
• Hydraulic Scissor Lift
• Two-Part Jack

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Ratcheting Mechanical JackUS Pat No. 6,929,248
J. B. Matney and B. A. Matney

• Mechanical jack comprised of a ratcheting gear
  track connected to a frame
• Ratchet is disengaged by twisting the handle

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Piston BlockPatent 3759488 Lukas

• Spring loaded block is pushed in between piston
  head and hydraulic cylinder to prevent premature
  lowering of jack.

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Lift Block (1)Patent 5221073 Shockley

• User inserts metal bar into jack frame once
  vehicle has been lifted to prevent premature
  lower of jack.

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Lift Block (2)Patent 5984270 Hussaini et al.

• Sliding box that rests between support bar and
  main lifting body is pinned in place by user once
  jack is lifted.

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4-Post Lift LockPatent 6382358 Kritzer

• Spring loaded mechanism to automatically lock a 4
  post lift into position.

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Hydraulic Scissor LiftPatent 6182796 Perlstein
et al.

• Hydraulic lift designed to lift vehicle on flat
  surfaces. Intention to replace hydraulics with
  telescoping arms to provide vehicle support in
  case of jack failure.

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Two-Part Jack US Pat No. 5,183,235 Inventor
Arzouman et al.
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• Two-part jack system consisting of a mechanical
  jack stand with a ratchet mechanism and a ratchet
  release.
• Power unit raises and lowers jack.
• Control mechanism locks power unit in an aligned
  position relative to jack stand.

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Next Weeks Deliverables

• Determine and Evaluate Design Criteria.
• Use pairwise technique to weight design criteria.
• Rank and score concept designs according to how
  well they fit the design criteria. (Make sure to
  have well designed scoring scale).
• Present ranks and scores in normalized fashion.
• Interpret and discuss results.