Safety brake for block and tackle window balance

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 7028371
APP PUB NO 20030213661A1
SERIAL NO

10396740

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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The present invention relates to inertial braking system for spring-loaded devices, such as block and tackle window balances incorporated in single and double hung window assemblies. In one embodiment, a block and tackle window balance includes a translatable block assembly disposed in a track including a pawl pivotally attached to the translatable block assembly. The pawl, in response to a rapid acceleration of the translatable block assembly, rotates about a pivot and frictionally engages the track, thereby wedging the translatable block assembly in the track. In another embodiment, the translatable block assembly includes a cam attached to the pawl and a brake shoe disposed between the cam and a cord seated within a pulley. Rotation of the pawl causes the cam to translate the brake shoe, thereby compressing the cord against the pulley.

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Patent Owner(s)

Patent OwnerAddress
AMESBURY GROUP INC57 HUNT RD AMESBURY MA 01913

International Classification(s)

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  • 2003 Application Filing Year
  • F16F Class
  • 347 Applications Filed
  • 146 Patents Issued To-Date
  • 42.08 % Issued To-Date
Click to zoom InYear of Issuance% of Matters IssuedCumulative IssuancesYearly Issuances20032004200520062007200820092010201120122013201420150255075100

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Newman, Gary Roger Valley Springs, SD 10 47
VerSteeg, Lawrence Sioux Falls, SD 3 127

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Patent Citation Ranking

  • 5 Citation Count
  • F16F Class
  • 1.66 % this patent is cited more than
  • 19 Age
Citation count rangeNumber of patents cited in rangeNumber of patents cited in various citation count ranges415951187201 - 1011 - 2021 - 3031 - 4041 - 500102030405060708090100110120130140150160170

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