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Rollover protection system for a working vehicle

  • US 5,503,430 A
  • Filed: 04/22/1994
  • Issued: 04/02/1996
  • Est. Priority Date: 12/28/1993
  • Status: Expired due to Fees
First Claim
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1. A rollover protection system for a working vehicle, comprising:

  • a pair of lower props fixed at lower ends thereof to a chassis;

    a U-shaped upper cross bar pivotally connected to upper ends of said lower props; and

    connecting means disposed between said lower props and said upper cross bar for selectively permitting said upper cross bar to pivot relative to said lower props, said connecting means including;

    a pair of right and left engaging members disposed at said upper ends of said lower props, respectively;

    a pair of right and left engageable members disposed at lower ends of said upper cross bar, respectively; and

    control means for selecting between a first state to engage said engaging members and said engageable members, and a second state to disengage said engaging members and said engageable members;

    wherein said lower props and said upper cross bar are elastically movable between said second state of said engaging and engageable members which form an unbiased free state for said upper cross bar and said lower props, and said first state of said engaging and engageable members in which said engaging members and said engageable members are elastically biased away from each other by an elastic deformation of said lower props and said upper cross bar from said unbiased free state.

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