Claims
- 1. A moldboard assembly for a plow having longitudinal carrier means, comprising, support means, a moldboard having a blade with a lower edge, said moldboard mounted on said support means, said support means mounted on said carrier means by a main support pivot, linkage means connecting the carrier means and a point on the support means between the pivot and the lower edge of the blade, said linkage means including a lower link having its lower end connected by a first pivot to said point, an upper link pivotally connected by a second pivot to the carrier means rearwardly of the first pivot, a third pivot connecting the upper link to said lower link detent means including a ball carried by one link cooperating with a recessed detent engaging means carried by the other link, in an operative position of the moldboard said detent engaging means being so positioned that when the upper and lower links are at an angle slightly less than 180.degree., said third pivot lies outwardly of a line connecting the first and second pivots, said detent means then being engaged by said engaging means, said detent means being disengaged from said engaging means when said moldboard encounters a greater than predetermined resistance in its forward movement to permit said moldboard to pivot rearwardly as said upper and lower links move from an extended to a smaller angular relationship, and whereby, after the plow moves past the resistance the carrier means may be lifted to raise the moldboard blade above the earth to permit the moldboard to drop by gravity to its operative position.
- 2. A moldboard assembly in accordance with claim 1, in which the detent means is mounted on the lower portion of the upper link and the detent engaging means is mounted on the lower link.
- 3. The assembly of claim 2, said lower link having an upper portion with an extended ramp portion, and said detent means rides over the ramp portion of said lower link to permit said moldboard to pivot rearwardly.
- 4. The assembly of claim 1, and means resiliently urging said ball of said detent means against the detent engaging means.
- 5. The assembly of claim 4, and means for adjusting the position of said second pivot to change the angle of the moldboard.
- 6. A moldboard assembly as in claim 1, said support means having an outwardly extending arm above the main support pivot, tension means extending between the arm and said linkage means, said tension means assisting in the initial return of said moldboard from a raised to a lower position.
- 7. A moldboard assembly as in claim 6, in which the tension means is connected to the linkage means at the third pivot.
- 8. A moldboard assembly as in claim 6, in which the tension means is a coil spring.
- 9. A moldboard assembly for a plow having longitudinal carrier means, comprising, support means, a moldboard having a blade with a lower edge, said moldboard mounted on said support means, said support means mounted on said carrier means by a main support pivot, linkage means connecting the carrier means and a point on the support means between the pivot and the lower edge of the blade, said linkage means including a lower link having its lower end connected by a first pivot to said point, an upper link pivotally connected by a second pivot to the carrier means rearwardly of the first pivot, a third pivot connecting the upper link to said lower link, detent means mounted on a lower portion of the upper link cooperating with detent engaging means mounted on the lower link, in an operative position of the moldboard said detent engaging means being so positioned that when the upper and lower links are at an angle slightly less than 180.degree., said third pivot lies outwardly of a line connecting the first and second pivots, said detent means then being engaged by said engaging means, said detent means being disengaged from said engaging means when said moldboard encounters a greater than predetermined resistance in its forward movement to permit said moldboard to pivot rearwardly as said upper and lower links move from an extended to a smaller angular relationship, said lower link having an upper portion with an extended ramp portion, said detent means riding over said ramp portion of said lower link to permit said moldboard to pivot rearwardly, and whereby, after the plow moves past the resistance the carrier means may be lifted to raise the moldboard blade above the earth to permit the moldboard to drop by gravity to its operative position.
- 10. The moldboard assembly of claim 9, and means resiliently urging said detent means against the detent engaging means.
- 11. The moldboard assembly of claim 10, and means for adjusting the position of said second pivot to change the angle of the moldboard.
- 12. The moldboard assembly of claim 11, said support means having an outwardly extending arm above the main support pivot, tension means extending between the arm and said linkage means, said tension means assisting in the initial return of said moldboard from a raised to a lower position.
- 13. The moldboard assembly of claim 12, in which the tension means is connected to the linkage means at the third pivot.
- 14. The moldboard assembly of claim 13, in which the tension means is a coil spring.
- 15. The moldboard assembly of claim 13, in which said detent means is a ball and said detent engaging means is a depression.
Cross-Reference to Related Applications
This application is a continuation-in-part of application Ser. No. 07/726,962 filed Jul. 8, 1991 now abandoned.
US Referenced Citations (21)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
726962 |
Jul 1991 |
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