US1850310A - Drawbar - Google Patents

Description

March 22, 1932.

D. F. AINSLIE DRAWBAR Filed Jan. 14. 1931 4 Sheets-Sheet 2 A Home y Marh 22, 1932. DF. AlNsLlE DRAWBAR Filed Jan. 14, 1951 4 Sheets-Sheet 3 In ven ur ,Wd'M/JMn/s/zle t March 22, 1932. D. F, AxNsLlE DRAWBAR Filed Jan. 14, 1931 4 Sheets-Sheet 4 A llorne y Patented Man 22, 1932 DONALD F. AINSLIE,QOF BISHGPf CALIFORNA DRAW'BAR" Application filed .Tan-nary 14'; 1931i Serial' Nol 508,1'249.L

This invention relates to new and useful improvements ink draw bars, and more particularly to a bar particularly adapted for use in connection with a tractor.

The principal object of this invention is to provide a draw bar which will be positiveacting, and which when not in use will be compact and not susceptible to the ready developments of defects.y

During the course of the following speciication and claims, other important objects and advantages of the invention will readily become apparent to the reader.

In the drawings Figure 1 represents a 'fragmentary side elevational view of a tractor with the draw bar in use therewith. Y

Fig. 2 represents a longitudinal sectional view through the draw bar. y

Fig. 3 represents a longitudinal sectional view through the dra-w bar in released position.

Fig. 4 represents anend elevational view looking at the tractor endlthe-reof.

Fig. 5 represents a sectional view, taken substantially on the line'5-5 `of Fig.v 3.

Fig. 6 represents a sectional view'taken substantially on the line '6 6 of Fig. 3.

Fig. 7 represents a fragmentary detailed 30 sectional view through the load spring acljusting means.

Fig. 8 represents an end'viewrof one of the abutting collars.

Fig. 9 represents a front eleva-tional view 35 of the draw bar barrel.

Fig..10 represents another side elevational view of the drawV barbarrel.

Fig. 11 represents a perspective View of one of the levers.

Fig. 12 represents a perspective view of the removable pin.

Referring to the drawings wherein like numerals designate like parts, it can be seen that the draw bar includes a barrel provided with a pair of diametrically opposed elongated slots 6 at its intermediate portion, and a pair of diametrically opposed and somewhat shorter slots 7 inclined toward onev end 50 of the barrel from the aforementioned slot 6 and on a plane at right angles to the slot 6.

@ne end ofthe barrel is provided with threads 8 onto which the threaded' collar 9 is-fengageable. Rivets extend throughrthis end portion of the barrel for securing the blocks 9-9 within the-barrel to guide the pair oflevers, each generally referred'to by nu1neral10. Y

Each oftheselevers' 10 includes an elongatedl bar 11 having a laterally disposed head 12 atl one endr thereof. Theopposite end of the bar is bifurcatedby the slot 13 to provide the legs 14 and 15, the leg 15 being substantially longer than the leg 14' and being provid'edi with' anv inwardly disposed oblique f'ootlG.

The adjacent endof the leg 14 is beveled atitsouter'corner as'at1.7. A lug 18 projects laterally on thesame side as the head 12, and'isflocatedat the point where the bifulrc'atedportion of the bar 11 terminates at its inneriextent. Y

These bars 10 are toV be assembled in overlapping relation and in opposed relation, withvthe openings' 19 registering so that the samef cank belsecuredt'o the usual tailpiece 2O (see'Fig. 1) of a tractor generally referred to by numerall 21, by a suitable securing element`22.

A slide sleeve' 23 is located on the intermediate'p'ortion of the barrel `and is provided with a collar 24 onl its outer end, the same being reduced atitsinnersidel to provide the annularpocket y25 for receiving the lugs 18 on the levers 10. Aslidecollar 26 located over the portion of the barrel having the slot 7 therein,andthissleeve 26 is provided-with the collar 27 which is Vadapted for abutment with the collar 25', when the draw bar is without a load.

Another collar 28 is stationarily secured to the barrel 5 byY the'bolts29--29 land interposed between the collar 28 vand the collar 27 is thebuiier spring-30. The sleeve 26 is provided with slotsregistering with the slotsV 7 "andfjthru 'the slots extends the key 31 provided with"openin'gs32V inthe ends thereof for receiving cotter pins "33 [in the man-ner shown'infFig. 6 Thiskey lis'adapted for the load. In this position of the draw bar, the lugs 18 are engaging Within the pockets 25 and the load spring 34 Which is interposed between the adjusting nuts 35 on the threaded portion 8 of the valve, and the collar 24 is erztended fully.

Fig. 3 shows the elongated bars 11 about to be released from the barrel 5. In the position shown, the lugs 1S have just disengaged from the pocket 25 of the collar 24 and the spring 34 is about to urge the collar 24 in the direction toward the collar 27. From this position, the bars 11 pull out of the barrel, thus permitting separation of the tractor u and trailer.

ln order to permit assembly of the coupling, the bars 11 are inserted in the barrel and are forced baclrivardly until the oblique feet 16 of the legs 15 engage the bolts 29. This results in a contraction of the legs which obviously separate the legs 14 so that they ride on opposite sides of the lrey 31 and When the key is disposed in the position substantially shoivn in Fig. 2, the lugs 13 Will snap into the pocket of the collar 24, and thus the draw bar is firmly connected together again.

The spring 34 will exert sufficient tension against the collar 24 to always maintain the bars "within the barrel until sufiicient force is exerted to overcome the spring sufficiently to permit disengagement of the leg 14 from the liey 31. it this point, the lugs 18 Will readily ride out of the pockets 25 (see Fig. 3) and immediately, the bars Will disconnect from the barrel entirely. rlfhe j amb nut can be fed on the threaded portion of the barrel 5 to maintain the spring compressed against the collar 24, so that the bars can be used Without the automatic control operation, and furthermore this nut 35 is employed to vary the tension of the spring 34 when the same is employed for automatic control.

l While the foregoing specification sets fort-h the invention in specific terms, it is to be understood that numerous changes in the shape, sise and materials may be resorted to Without departing from the spirit and scope of the invention as claimed hereinafter.

Havin g thus described my invention, What I claim as new is :-d

1. A draw bar comprising a barrel, a pair of rockable levers, a fixed collaron the barrel, a slidable collar on the barrel, a spring interposed betiveen the collars, and lugs on the levers for engagement with the slidable collar.

2. A draw bar comprising a barrel, a pair of roclrable levers, a fixed collar on the barrel, a slidable collar on the barrel, a spring interposed between the collars, lugs on the levers for engagement With the slidable collar, and a buffer spring, for absorbing the shock of the collar When the same is released suddenly.

3. A draw bar comprising a barrel, a stationary collar and a slidable collar on the outside of the barrel, a pair of swingable levers projecting into the said barrel, each of said levers being provided With a lug for engagement with the said slidable collar, each of said levers being provided With a slot in the end thereof located within the barrel, and a pin for disposition thru the barrel and through 4the slot in the levers when registering.

4. A draw bar comprising a barrel, a staionary collar and a slidable collar on the outside of the barrel, a pair of svvingable levers projecting into the said barrel, each of said levers being provided with a lug for engagement with the said slidable collar, each of said levers being provided with a slot in the end thereof located Within the barrel, a pin for disposition through the barrel and through the slot in the levers when registering, a foot member on each of the last-mentioned ends of the levers, and a pair of transversely disposed members Within the barrel between which the feet are adapted to engage when the l vers are retained by the key.

5. A draw bar of the character described comprising a barrel, a pair of stationary collars on the barrel, a. pair of slidable collars between the stationary collars in opposed relation to each other, compressible springs between the stationary collars and the corresponding slidable collars, one of the said slidable collars being provided With a recess therein, said barrel being provided With slots therein registering with the recess, and a pair of levers projecting into the said barrel, each lever being provided with a lug for disposition through a slot in the barrel and for engagement into the recess of the aforementioned slidable collar.

6. A draw bar comprising a barrel, a pair of rockable levers, a slidable collar on the barrel, said'barrel being provided with slots therein, projections on the levers extending through the slots for engagement With the slidable collar, an adjustable collar on the barrel, and a compressible spring interposed between the slidable collar and the said adjustable collar.

In testimony whereof I affix my signature.

DONALD F. AINSLIE.

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