Side pivot seat

• US 5,565,829 A
• Filed: 04/06/1995
• Issued: 10/15/1996
• Est. Priority Date: 04/06/1995
• Status: Expired due to Fees

• Current Assignee: Clark Equipment Company (Doosan Heavy Industries and Construction Company Limited)
• Original Assignee: Clark Equipment Company (Doosan Heavy Industries and Construction Company Limited)
• Inventors: Volk, Joseph R., Jacobson, Scott B., Asche, James E., Loraas, Orlan J., Deyo, Charles
• Primary Examiner(s): DONOVAN, LINCOLN D
• Application Number:
  US08/418,103
• Time in Patent Office: 558 Days
• Field of Search: 335/206-7, 200/85 A
• US Class Current: 335/205
• CPC Class Codes: H01H 3/141 Cushion or mat switches

Abstract

A seat assembly and a power machine includes a seat having a front portion, a back portion, and first and second side portions. A base plate supports the seat, and a hinge is pivotably connected between the first side portion of the seat and the base plate. The second side portion of the seat is connected to the base plate to allow limited movement of the second side portion of the seat relative to the base plate. A spring is coupled to the seat and to the base plate and urges the second side portion of the seat away from the base plate. A Hall effect sensor housing supports a Hall effect sensor and is operably mounted to one of the base plate and the seat. A magnet is operably mounted to another the base plate and the seat and is positioned to cooperate with the Hall effect sensor so that the Hall effect sensor provides a sensor indicative of a position of the second side portion of the seat.

Claims

1. A seat assembly in a power machine, comprising:

a seat having a front portion, a back portion, a first side portion and a second side portion generally opposing the first side portion;

a seat pan supporting the seat;

a hinge pivotably connecting the first side portion of the seat to the seat pan;

a connection assembly connecting the second side portion of the seat to the seat pan to allow limited movement of the second side portion of the seat relative to the seat pan, between a first position when the second side portion of the seat is positioned a first distance from the seat pan and a second position when the second side portion of the seat is positioned a second distance from the seat pan;

a spring, coupled to the seat and the seat pan, urging the second side portion of the seat to pivot about the hinge and move away from the seat pan;

a Hall effect sensor housing supporting a Hall effect sensor and being operably mounted to one of the seat pan and the seat; and

a first magnet operably mounted to another of the seat pan and the seat and positioned to cooperate with the Hall effect sensor so the Hall effect sensor provides a sensor signal indicative of the second side portion of the seat being in one of the first and second positions.

2. The seat assembly of claim 1 wherein the first magnet is supported by a magnet support member and wherein the magnet support member and the Hall effect sensor housing have generally opposing surfaces arranged such that a clearance between the opposing surfaces changes as the second side portion of the seat moves between the first and second positions.

3. The seat assembly of claim 1 and further comprising:

an apron coupled to the seat and extending generally about the seat pan.

4. The seat assembly of claim 3 and further comprising:

a support plate fixedly coupled to the seat and pivotably mounted to the seat pan by the hinge.

5. The seat assembly of claim 4 wherein the apron is fixedly connected to the support plate for movement with the support plate.

6. The seat assembly of claim 4 wherein the spring is operably mounted to one of the support plate and the seat pan and located to urge the support plate away from the seat pan.

7. The seat assembly of claim 4 wherein the hinge comprises:

a resilient, compressible member coupled to the seat pan and the support plate to provide a movable connection between the seat pan and the support plate.

8. The seat assembly of claim 7 wherein the resilient, compressible member comprises a rubber grommet.

9. The seat assembly of claim 1 wherein the Hall effect sensor housing has a peripheral surface and further comprising:

a magnet support member supporting the first magnet and having a peripheral surface; and

wherein the peripheral surfaces of the magnet support member and the Hall effect sensor housing are contoured such that clearance between the peripheral surfaces varies.

10. The seat assembly of claim 9 wherein the magnet support member is mounted to the seat and is movable relative to the Hall effect sensor housing.

11. The seat assembly of claim 10 wherein the peripheral surface of the magnet support member tapers away from the peripheral surface of the Hall effect sensor housing.

12. The seat assembly of claim 11 wherein the Hall effect sensor housing is shaped to form an inner portion and wherein the magnet support member is movable within the inner portion of the Hall effect sensor housing.

13. The seat assembly of claim 12 wherein the peripheral surface of the Hall effect sensor housing is an inner peripheral surface generally defining an axis and wherein the peripheral surface of the magnet support member is an outer peripheral surface tapered such that clearance between the inner peripheral surface of the Hall effect sensor housing and the outer peripheral surface of the magnet support member is different when measured at a first point along the axis and at a second point along the axis.

14. The seat assembly of claim 13 wherein the outer peripheral surface of the magnet support member is formed as a conical taper.

15. The seat assembly of claim 13 wherein the outer peripheral surface of the magnet support member has a first conically tapered portion and a second conically tapered portion coupled to the first conically tapered portion at an intermediate portion, clearance between the intermediate portion and the inner peripheral surface of the Hall effect sensor housing being less than clearance between the inner peripheral surface of the Hall effect sensor housing and the first tapered portion and which is less than clearance between the inner peripheral surface of the Hall effect sensor housing and the second tapered portion.

16. The seat assembly of claim 15 and further comprising:

a second magnet supported by the magnet support member proximate the first magnet, the first magnet and the second magnet being oppositely polarized.

17. A Hall effect sensor assembly for sensing seat position of a movable seat on a power vehicle, the Hall effect sensor assembly comprising:

a Hall effect sensing element;

a sensor support member supporting the Hall effect sensing element and having a peripheral surface;

a first magnet;

a magnet support member supporting the first magnet and having a peripheral surface, one of the magnet support member and the sensor support member being mounted to the seat and being movable relative to another of the sensor support member and the magnet support member, between a first position and a second position;

wherein the first magnet and the Hall effect sensing element are supported relative to one another so that the peripheral surfaces generally oppose one another and so that the Hall effect sensing element interacts with the first magnet to provide a signal indicative of movement between the first and second positions; and

wherein the opposing peripheral surfaces of the magnet support member and the sensor support member are contoured such that clearance between the opposing peripheral surfaces varies.

18. The Hall effect sensor assembly of claim 17 wherein the magnet support member is mounted to the seat and is movable relative to the sensor support housing.

19. The Hall effect sensor assembly of claim 18 wherein the peripheral surface of the magnet support member tapers away from the peripheral surface of the sensor support member.

20. The Hall effect sensor assembly of claim 19 wherein the sensor support member is shaped to partially wrap around the magnet support member and wherein the magnet support member is movable within the sensor support member.

21. The Hall effect sensor assembly of claim 20 wherein the peripheral surface of the sensor support member is an inner surface shaped to generally define an axis and wherein the peripheral surface of the magnet support member is an outer peripheral surface tapered such that clearance between the inner peripheral surface of the sensor support member and the outer peripheral surface of the magnet support member is different when measured at a first point along the axis and at a second point along the axis.

22. The Hall effect sensor assembly of claim 21 wherein the outer peripheral surface of the magnet support member is formed as a conical taper.

23. The Hall effect sensor assembly of claim 21 wherein the outer peripheral surface of the magnet support member has a first conically tapered portion and a second conically tapered portion coupled to the first conically tapered portion at an intermediate portion, clearance between the intermediate portion and the inner peripheral surface of the sensor support member being less than clearance between the inner peripheral surface of the sensor support member and the first tapered portion and between the inner peripheral surface of the sensor support member and the second tapered portion.