This patent shows the spring means as a bar deflectable in bending. Patent to Du Shane U. For general purposes of the present invention, these may be taken as equivalents and as representative of mechanical spring means as distinguished from hydraulic sensing means such as that disclosed in Assignee's U.
A second characteristic of Du Shane U. In this arrangement, in particular, the selectivity as to which response will control the valve means adds further to delaying effects on the transmission of the signal. The Koch patent solves the problem by interposing force amplifying means in the signal transmitting means but in response to hydraulic sensing of the draft forces.
The Koch patent does not consider the multi-functional characteristic of Du Shane U. The force-amplifier provided by the present invention is significantly more important than in a case involving hydraulic sensing Koch.
In a mechanical sensing system, as here involved, the motion available from the load spring is often relatively small and, without amplification, frequently not sufficient to overcome reaction forces in the linkage. Unless and until the reaction forces are overcome, there will be little or no signal or at best a weak signal. Thus, the basic differences are seen to flow from the two types of sensing means, hydraulic vs.
According to the present invention, force-amplifying means is interposed in the signal-transmitting linkage in a draft control system employing mechanical spring means.
More especially, the invention provides such amplifying means in a mechanically sensing system of the character forming the subject matter of the above-mentioned Du Shane U. Further features reside in incorporating the amplifying means in a known system without requiring substantial changes in the basic structure. Reference will be had first to FIGS. The numeral 10 denotes the rear portion of a tractor from which the right-hand rear wheel has been removed in the interest of clarity.
An implement, such as a plow 12, is draft connected to the tractor by hitch means 14 of a typical three-point type including a pair of lower draft links 16 see FIG. An upper portion of the tractor includes a housing 20 in which is journalled a transverse rockshaft 22 to opposite ends of which are affixed lift arms 24 only one of which is shown. A lift link 26 is connected between each lift arm and its corresponding draft link, as is conventional.
As will be seen, rocking of the rock shaft causes raising and lowering of the plow generally about a transverse axis established by a cross bar 28, best shown in FIG. This bar is a mechanical spring and is supported adjacent to its opposite end portions by the tractor, as at 30, and each end portion overhangs laterally to receive the front end of the respective draft link. A bracket 32 at each side of the tractor loosely embraces the respective overhanging portion so as to allow the overhanging portion to be deflected rearwardly in response to rearward draft forces imposed on the draft link by the draft on the plow, all as explained in the patent to Du Shane, U.
When this occurs, the midportion of the bar 28, as at 34 see also FIG. Disposed within the tractor housing and pivoted at 36 on a transverse axis is a load responder Members Registered members Current visitors. Calendar Upcoming Events. New Resources New posts. Log in Register.
Search titles only. Search Advanced search…. New posts. Forum list. Search forums. Log in. Install the app. Contact us. Close Menu. Forums Farm Business Agricultural Matters. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser. I have a MF with two hydraulic levers, I usually only use one, the furthest away from the Seat is set fully back, and lift and lower the three point linkage I just use the lever nearest the seat, fully back is to lower, and moving the lever forward towards the constant pump position is to raise the three point linkage.
I was asked today when buying tedder, have you float on your tractor? Location Tyrone, Northern Ireland. I found it will give you much smoother results. Feb 27, 4. Gil Member. For plowing there is no substitute for draft control. You just aim the machine where you wish to plow, drop the impliment and let the machine control the load it can pull.
For a very good discription of the operation, go to www. Click to enter. Click technical info. Click three point lift types and look for draft control. Feb 27, 5. Anyone have any idea why a draft control setup would prohibit a "top and tilt" combo? I thought that I saw something to this effect for a couple of manufacturers, but right now I only find it listed in JD's specs. For JD the two options are mutually exclusive, you pick one or the other or none. Feb 27, 6.
MossRoad Epic Contributor. On my IHB the draft control raises and lowers the lift arms automatically according to the movement of the rockshaft in relation to the draft control sensitivity setting. As long as you keep the top link or cylinder for top and tilt from changing length, draft control should work just fine? Feb 28, Thread Starter 7. I think what I said is correct, I hope.
Kurt, You might find it intresting to read about how Harry Ferguson designed the first draft control system. Remember hydraulic systems were in their infancy back then - One of the problems Ferguson had was the foaming of oil since he did not have the "fancy" oils we have now.
So he made the pump so it ran submerged in the oil of the differential. Then to control the lift, which was just power up and gravity down, he put the valve on the pump inlet. There is more detail in some of the books on the design of the Ford N-series tractors that had the Ferguson System in them. I'm giving you what I remember from reading them. Mosey, This question comes up often on the N-Board.
Since that was the "model" for other tractor manufactures, what it says should apply to most all other makes - in principle, if not exactly.
The other guys have given you good info, but I think you will find mine will help with your using it. I use it a lot when back blading, weither it is to grade the road or to level an area of dirt for, say a yard, or even pulling snow off the drive.
Regards, Larry Draft control post. Draft control can work by sensing the pulling on either the top link or the lower links, depending on the tractor model, and its sensitivity is usually adjustable on modern tractors. Although it won't help you with bushhoging, it can have the desired effect you describe when using a ground engaging implement.
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