US2905044A

US2905044A - Locking pin having pivotal locking ring

Info

Publication number: US2905044A
Application number: US571422A
Authority: US
Inventors: Fisher Baxter
Original assignee: Individual
Current assignee: Individual
Priority date: 1956-03-14
Filing date: 1956-03-14
Publication date: 1959-09-22
Anticipated expiration: 1976-09-22

Description

Sept. 22, 1959 B. FISHER 2,905,044

LOCKING PIN HAVING PIVOTAL LOCKING RING Filed March 14, 1956 INVENTOR.

B'AXTER FISHER United States Patent LOCKING PIN HAVING PIVOTAL LOCKING RING Baxter Fisher, Springfield, Oreg. Application March 14, 1956, Serial No. 571,422

3 Claims. (Cl. 85--8.1)

This invention relates to improvements in locking pins and particularly to locking pins for drawbars of the threepoint hook up type used on tractors and the like.

The primary object of the invention is to provide a lockin pin that can easily be applied to a bearin and easily removed therefrom without the use of tools or the like.

Another object of the invention is to provide a locking pin that is simple of construction and of such a design that it will not shake loose or out of the bearing being keyed and that unskilled labor can replace or remove easily.

Other objects and advantages will become apparent in the following specification when considered in the light of the attached drawings, in which:

Figure 1 is a side elevation of the invention shown attached to mechanism on a differential housing of a conventional tractor, illustrating how the drawbar is journalled to the journal bearing and is locked thereon by the locking pin.

Figure 2 is a fragmentary horizontal section of the journal and a portion of the drawbar showing the locking pin in place, taken on the line 2-2 of Figure 1, looking in the direction indicated.

Figure 3 is an enlarged fragmentary sectional view, taken on the line 3--3 of Figure 1, looking in the direction indicated.

Figure 4 is an enlarged side elevation similar to Figure 1, except that the locking pin is in position for either placing or removing the same from the journal pin.

Figure 5 is a fragmentary side elevation of a modified structure forming the counter-Weight on the locking ring.

Referring now to the drawings in detail wherein like reference numerals indicate like parts throughout the several figures, the reference numeral indicates generally the diflferential of a tractor. A fragmentary portion of a drawbar is indicated at 11, and is adapted to be journalled on a journal pin 12 by a bearing sleeve 13 which forms part of the drawbar 11.

This invention consists of a locking pin 14 which is adapted to pass down through an opennig 15 formed in the journal pin 12. The upper end of the locking pin 14 has an eye 16 formed thereon through which a locking ring 17 operates.

The locking ring 17 includes a circular portion 18, having an open U-shaped loop 19 extending radially outwardly therefrom with a larger closed loop 20 also ex tending radially outwardly therefrom in circumferentially spaced relation to the loop 19. The loop 20 acts as a 2 counter weight and handle to rotate the ring 17 while the open U-shaped loop 19 is adapted to clear an end 21 of the locking pin 14 while applying the pin 14 through the opening 15 of the journal pin 12.

A thumb screw 22 when desirable may be provided to project through the eye 16 and clamp against the ring 17 in some installations for locking the ring in the position shown in Figure l.

The operation of the improved locking pin 14 will now be described. The bearing 13 of the drawbar 11 is placed over the journal pin 12, next the U-shaped loop 19 of the ring 17 is brought in alignment with the end 21 of the locking pin 14 and pivoted in the eye 16 to a position extending laterally from the pin 14. The locking pin 14 can then be dropped down through the opening 15 of the journal pin 12.

After the pin 14 has been lowered into the opening 15, the ring 17 is pivoted to the position shown in Figure 4 in alignment with the bifurcated end 23 of the locking pin 14, the loop 19 passing over the end 21 of the pin, aligning the circular portion 18 of the ring 17 with the bifurcated end 23 of the locking pin 14.

The operator then rotates the ring 17 using the loop 20 as a handle to the position shown in. Figure 1. This will place the circular portion 18 within the bifurcated end 23 of the locking pin 14 so that the same cannot become disengaged therefrom. The weight of the handle portion 20 being effective in maintaining the ring 17 in this position under normal conditions, but if it is desired to additionally lock the ring 17 in this posittion the thumb screw 22 can be tightened down against the ring 17. Additional weights may be added to the loop 20 if desired, although I have found that the weight of the loop 20 itself is of sufiicient Weight to hold the ring 17 in locked position under normal conditions.

Referring to Figure 5, I illustrated by dotted lines the position of an additional weight to the loop 20. This additional weight is indicated by numeral 24.

Having thus described the preferred embodiment of the invention, it should be understood that numerous structural modifications and adaptations may be resorted to without departing from the scope of the appended claims.

What is claimed is:

1. A locking pin comprisin a cylindrical body and a rigid ring, said cylindrical body having an eye extending through one end thereof with its axis substantially perpendicular to the axis of said body, said body having the end opposite said eye bifurcated to form a slot having parallel side walls extending parallel to the axis of said eye, said rigid ring extending through said eye and through said slot, said ring being freely movable through said eye and said slot, a radially outwardly extending integral U-shaped loop formed in said ring, said loop extending outwardly from said ring to a point beyond the bifurcated end of said body when aligned therewith and having the sides thereof spaced apart a distance greater than the diameter of said body, said ring when engaged in said slot forming a head for said body at the end thereof opposite said eye with said ring being rotatable circumferentially in said eye and said slot to a position aligning said loop with said body for disengaging said ring from said slot to permit rotation of said ring in said eye about the axis of said eye, and means on said locking pin for normally 'inaint'aining said loop out of alignment with said body.

2. A device as claimed in claim 1 wherein said last named means includes a substantially closed integral loop extending radially outwardly from said rin at a circumferentially spaced point from said first loop to provide a handle for rotating said ring with relation to said body, said normally closed loop being weighted to normally maintain said first loop in a non-aligned position with respect to said body.

3. A device as claimed in claim 1 wherein said last named means includes a set screw threaded into said body and extending into said eye toreleasably clamp said ring against movement therein.

UNITED STATES PATENTS Bonner Dec. 8, 1891 Knight Mar. 28, 1893 Pitt Dec. 22, 1914 Williamson Nov. 27, 1917 Strickland July 11, 1933 Joyce Oct. 27, 1936 Annis Aug. 21, 1956 FOREIGN lATENTS Austria Sept. 25, 1899