SUSPENSION DEVICE FOR A VEHICLE SEAT AND ESPECIALLY A TRACTOR SEAT

• US 3,861,637 A
• Filed: 05/25/1973
• Issued: 01/21/1975
• Est. Priority Date: 06/13/1972
• Status: Expired due to Term

• Current Assignee: Jacques Albert Huot Delongchamp
• Original Assignee: Jacques Albert Huot Delongchamp
• Inventors: DeLongchamp, Jacques Albert Huot
• Primary Examiner(s): Parsons, Jr., Marion
• Application Number:
  US05/364,119
• Time in Patent Office: 606 Days
• Field of Search: 248/399,400,408,409,423,162 297/307,308,309,345
• US Class Current: 248/576
• CPC Class Codes: B60N 2/504 attached to the base and the backrest
• CPC Class Codes: B60N 2/505 Adjustable suspension including height adjustment
• CPC Class Codes: B60N 2/506 Seat guided by rods
• CPC Class Codes: B60N 2/509 Seat guided by slides or the like
• CPC Class Codes: B60N 2/544 Compression or tension springs B60N2/542 takes precedence

Abstract

The suspension device essentially comprises elastic means having a vertical action for the suspension proper of the seat and disposed between a first vertically movable member and a supporting element, first means for adjusting the flexibility of the suspension by modifying the vertical distance under no load between the movable member and the supporting element, a second vertically movable member which directly supports the seat and is rigidly fixed thereto, second means for adjusting the height of the seat by modifying the relative vertical position of the first and second movable members, and third means for coupling the first and second movable members on completion of adjustment.

Claims

1. A vehicle seat structute for an agricultural vehicle, or the like, comprising a substantially L-shaped supporting frame, a mounting frame for mounting said supporting frame on the vehicle, guiding means for directly guiding said supporting frame with respect to said mounting frame for substantially vertical movement of said supporting frame, an intermediate seat-height adjusting means movably mounted within said mounting frame, means mounting said adjusting means for vertical movement within said mounting frame, said adjusting means having a first part fixed to said supporting frame and a second part movable vertically relative to said first part, manually operable locking means for locking said first part of said adjusting means to said second part at any selected position, initial tension-adjusting means comprising an initial supporting part operatively connected to said mounting frame and an initial tension adjusting part vertically movable with respect to said supporting part, manually operable control means for vertically adjusting said adjusting part with respect to said initial tension supporting part, and resilient elongated suspension means vertically located between said supporting frame and said mounting frame and having their ends attached respectively to said initial adjusting part and to said second part of said seat-height adjusting means.

2. A suspension device according to claim 1, further comprising resilient restoring means operatively connected at one end to said first part of said seat-height adjusting means and at the other end to said second part of said seat-height adjusting means, said restoring means having a restoring force greater than the weight of said supporting frame for urging said supporting frame upwardly with respect to said second part of said adjusting means.

3. A suspension device according to claim 2, wherein said guide means comprises a roller fixed to said supporting frame, a fixed concave track supported by said mounting frame on which said roller is guided, and a rocking lever having one end pivotally connected to said mounting frame and one end pivotally connected to said supporting frame.