US 3402773 A
Description (OCR text may contain errors)
SePt- 24 1963 M. D. JENNINGS ETAL 3,402,773
SPRING TRIP FOR IMPLEMENTS Filed Jan. 26, 1966 lNvENTORs MAPA/lm DJENNINGS BENJAMIN A` SHADER United States Patent O 3,402,773 SPRING TRIP FOR IMPLEMENTS Marvin D. Jennings, Naperville, Ill., and Benjamin A.
Shader, Golden, Colo., assignors to International Harvester Company, Chicago, Ill., a corporation of Delaware Filed Ian. 26, 1966, Ser. No. 523,146 Claims. (Cl. 172-265) This invention relates to earth working implements and particularly to cultivators and the like.
An object of the invention is the provision of simple and economical spring trip means for cultivators and the like.
Another object of the invention is the provision of novel means for mounting an earth penetrating tool on its support to accommodate tripping of the tool to an inoperative position in response to abnormal draft forces acting thereon and automatic return of the tool to its operating position.
Other objects and advantages of the invention will become clear from the following detailed description when read in conjunction with the accompanying drawings, wherein:
FIGURE l is a view in side elevation of an earth working implement embodying the features of this invention and showing a cultivator in its operating position.
FIGURE 2 is a View similar to FIGURE 1 Showing the cultivating tool in its tripped position, land FIGURE 3 is a view from the rear of FIGURE 1.
In the drawings the numeral designates a tool supporting shank bifurcated at its lower end by the provision of a standard 11 to the lower end of which a pair of spaced plates 12 are secured by bolts 13 `and nuts 14.
The lower ends of plates 12 carry a pivot pin 15 upon which is mounted, between plates 12, a channel shaped foot piece 16 having ears 17, an upper transverse connecting web 18, and spaced webs 19 and 20, the lower portion of foot piece 16 serving for the mounting thereon of an earth penetrating cultivator shovel 21, indicated in dotted lines in FIGURES 1 and 2, the earth working tool being secured to the foot piece 16 by convention-al means, not shown.
A block 22 is aiiixed to the central portion of pin 15 and serves aS an anchor for one end of a helically coiled leaf spring 23, the outer terminal coil portion 24 of which is bent upwardly at its end and provided with a vertical Slot 25 in which is received a bolt 26 threaded -for reception in a threaded opening in the lower end of standard 11, and having a head 27.
A nut 28 is threaded on bolt 26 and contines therebetween and the upper end of the coil spring, lan eccentric 29 mounted on the bolt end engageable with the generally horizontal portion 24 of the leaf spring. The portion 24 of the leaf spring is tensioned upwardly into engagement with eccentric 29, so that rotation of the eccentric results in a vertical adjustment of the bent end of the spring within the confines of slot 25, the purpose of such adjustment being hereinafter more fully understood.
A pin 30 is secured between ears 17 of foot piece 16 and has mounted thereon a roller 31 engageable with a shoulder 32 formed by a bend in the outer coil of the leaf spring 23 and forming an abutment on the inner face of the spring engageable by roller 31, the latter serving as a stop to hold the foot piece and the tool 21 in their operating position as shown in FIGURE 1 under normal Soil and draft conditions. Adjustment of the pitch of the foot piece 16 and its associated earth working tool 21 is made by adjusting bolt 26, the end of which engages the web 18.
When abnormal draft conditions are encountered that would otherwise damage the earth working tool 21, the stop member 30, 31 rolls over the abutment 32 to the position shown in FIGURE 2 and the earth working tool trips toits inoperative position against the tension of the spring. In the tripped position of FIGURE 2 the earth working tool is biased by spring 23 to return to the operating position of FIGURE 1.
The eccentric 29 is shown in the position in which the greatest tension is applied by the spring against the roller 31 so that the greatest pressure is required to cause the tool to trip. To lessen the required tripping pressure the nut 28 is moved away from eccentric 29 so that the latter can be revolved to present a side of shorter radius against the pressure of the spring. Nut 28 is then again tightened to frictionally hold the eccentric and the bent end of the spring against the head 27 of the bolt.
It is believed that the construction and operation of the novel implement spring trip of this invention will be clearly understood from the foregoing description. It should likewise be understood that the invention has been described in its preferred embodiment and that modifications may be made therein without departing from the Spirit of the invention or the scope of the appended claims.
What is claimed is:
1. In an implement a shank having a transverse pivot pin mounted in its lower end, an earth penetrating tool mounted on said pivot pin for tripping about the axis thereof from an operating to a tripped position, yieldable means opposing the tripping of said tool comprising a leaf spring having one end anchored t-o said shank and a plurality of coils helically arranged about the axis of said pivot pin, means securing the other end of said spring to the shank at a location remote from said pivot pin, said spring having means forming an abutment thereon, and a stop member mounted on said tool and engageable with said abutment to hold the tool against tripping in the normal operation thereof, Said spring being yieldable radi-ally in response to abnormal draft forces acting on said tool during operation to cause said stop member to ride over said abutment and accommodate tripping of the tool.
2. The invention set forth in claim 1, wherein said abutment is formed on the inner Surface of one of said coils.
3. The invention set forth in claim 2, wherein Said shank is bifurcated at its lower end and said tool includes a pair Iof ears mounted in the lower end of the shank on said pivot pin and confining a substantial portion of said leaf spring therebetween to prevent lateral deection of the spring.
4. The invention set forth in claim 3, wherein said stop member is a roller rotatably mounted between said ears.
5. The invention set fort-h in claim 4, wherein Said abutment is a bend in said spring forming a shoulder engageable with said stop member.
References Cited n UNITED STATES PATENTS 290,366 12/1883 Snyder etal. 172--710 1,194,006 8/1919 Fry 172--265 ABHAHAM G. STONE, Primary Examiner.
I. PETERSON, Assistant Examiner.