Apparatus and methods for impact testing of a transparent substrate are provided. The apparatus includes a base (110) for receiving the transparent substrate (112), the base having a curved surface (124) about which the transparent substrate is bent by a first fixture (130) and a second fixture (132). An abrasive sheet (136) is disposed between the transparent substrate and an impacting object (138) which is released from above the substrate such that the force from the impacting object causes damage to the transparent substrate while the transparent substrate is bent about the curved surface.

Drop-weight tower (110) for reproducibly initiating a crack in a material sample for fracture mechanics testing comprising a base (120) with a top surface upon which a sample holder (124) is mounted to grip a material sample, an attachment column (140) having a linear rail (142), a carriage (162) attached to the linear rail (142) and a stage (164) is attached to the carriage. The stage (164) includes a vertical rod (184) and a razor-blade holder (178). A weight is slidably mounted to the vertical rod (184). The carriage is used to adjust the height of the stage (164) relative to the material sample. A hammer (180) slides up and down the vertical rod (184) to apply consistent and reproducible force on the razor (178) that then initiates the crack in the material sample.

Drop-weight tower (110) for reproducibly initiating a crack in a material sample for fracture mechanics testing comprising a base (120) with a top surface upon which a sample holder (124) is mounted to grip a material sample, an attachment column (140) having a linear rail (142), a carriage (162) attached to the linear rail (142) and a stage (164) is attached to the carriage. The stage (164) includes a vertical rod (184) and a razor-blade holder (178). A weight is slidably mounted to the vertical rod (184). The carriage is used to adjust the height of the stage (164) relative to the material sample. A hammer (180) slides up and down the vertical rod (184) to apply consistent and reproducible force on the razor (178) that then initiates the crack in the material sample.

A portable system and method for identifying roulette wheel biases includes a frame member rotatably attachable to a roulette wheel proximate a turret support, a ball-drop tube slidably engaged to the frame member and a laser positioned to measure at least a bounce height of a roulette ball dropped through the ball-drop tube onto selective areas of the roulette wheel. One or more sensors may be positioned to trigger the laser responsive to a roulette ball being dropped through said ball-drop tube. Software analyzes the bounce height to determine dead spots and hot spots on the roulette wheel. Sound waves may also be measured to determine dead spots and hot spots.

A portable system and method for identifying roulette wheel biases includes a frame member rotatably attachable to a roulette wheel proximate a turret support, a ball-drop tube slidably engaged to the frame member and a laser positioned to measure at least a bounce height of a roulette ball dropped through the ball-drop tube onto selective areas of the roulette wheel. One or more sensors may be positioned to trigger the laser responsive to a roulette ball being dropped through said ball-drop tube. Software analyzes the bounce height to determine dead spots and hot spots on the roulette wheel. Sound waves may also be measured to determine dead spots and hot spots.

A holder is provided. The holder includes a body and a plurality of fingers received by the body. Each of the plurality of fingers are operable to be translatable within the body to modify the configuration of the fingers. The fingers are operable to be reconfigured to correspond with a drop unit such that the drop unit is held in a desired orientation between the fingers and a drop leaf of a drop tester.

A holder is provided. The holder includes a body and a plurality of fingers received by the body. Each of the plurality of fingers are operable to be translatable within the body to modify the configuration of the fingers. The fingers are operable to be reconfigured to correspond with a drop unit such that the drop unit is held in a desired orientation between the fingers and a drop leaf of a drop tester.

The invention discloses a drop test device for a case of a vehicle battery pack. The device includes a bracket body, and a mounting frame is suspended horizontally on an upper end surface of the bracket body. The two mounting frames are fixed parallel to the bracket body, and a fixing frame is horizontally fixed below each of the mounting frames on the bracket body. A sliding seat is slidably arranged between the two mounting frames, and one side of the fixing frame is provided with a side connecting plate. A sliding rail is arranged between the sliding seat and the side connecting plate, and a simulated platform mechanism is slidably arranged on the sliding rail for body installation of the vehicle battery pack so as to design installation states of the vehicle battery pack according to different models.

The invention discloses a drop test device for a case of a vehicle battery pack. The device includes a bracket body, and a mounting frame is suspended horizontally on an upper end surface of the bracket body. The two mounting frames are fixed parallel to the bracket body, and a fixing frame is horizontally fixed below each of the mounting frames on the bracket body. A sliding seat is slidably arranged between the two mounting frames, and one side of the fixing frame is provided with a side connecting plate. A sliding rail is arranged between the sliding seat and the side connecting plate, and a simulated platform mechanism is slidably arranged on the sliding rail for body installation of the vehicle battery pack so as to design installation states of the vehicle battery pack according to different models.

Disclosed are display module evaluation jigs and methods, The display module evaluation jig includes: a first body defining a plurality of first recessions on a top surface of the first body; a second body disposed on and combined with the first body; and a plurality of insertions on the first recessions and between the first body and the second body. Inner lateral surfaces of the first body are directed toward and spaced apart from lateral surfaces of the insertions. The inner lateral surfaces define the first recessions.