Патент USA US2131947код для вставки
Oct. 4, 1938. G M, @woRE ' 2,131,947 SHEEP FOOT TAMPER Filed Nov. 26, 1.935 _ .2. Patented Oct. 4, 1938 , , 2,131,947. UNITED STATES PATENT OFFICE SHEEP IFOO-T TAMPER Gordon M. Gilmore, Los Angeles', Calif., assignor to Los Angeles Steel Casting‘Company, Ltd., Los Angeles, Calif., a corporation of vCalifornia Application November 26, 1935, Serial No. 51,612 5 Claims. (CI. 94-48) This invention relates to tampers’ of the sheep of adjacent tampingv elements, and whereby the foot type, such as are employed on tamping roll- replacement of all the feet on a roller may be ers 'of the character used in compacting the" sur'fa'ceiof the soil'asifor‘ example in road’building 'op- easily, quickly and economically .eifected and without the necessity of disturbing weld joints or 5 erati'ons. - Tampers of ‘the vabove type are ordinarily formed‘ of ‘cast metal in a' single piece and ‘are af?xe'd'tor the periphery of a cylindrical rollerlby a weld joint; a series of the‘ tamp'ers being'a'pplied 10 to‘ the ‘roller in circumferential and longitudinal rows thus stud'din'g‘ithe roller with a multiplicity 'o'f‘the tampin'g elements ‘with the adjacent e‘leme'nts so arranged and having their outer ends so formed as to leave an unbroken tread mark inTthe 15 surface of the ground being roller tamped. In tools. ' , Another object is to Provide a C'OIIStI'IIGtiOII in a sheep foot tamper whereby the foot portion and shank portion thereof are separable, and em- 10 bodving a means of connection between the foot portion and shank involving solely a wedge en easement between 17118 I001; and ‘Shank thereby obviating the use of supplemental connecting elements such as pins, bolts, keys, screw threads, 15 weld joints, and the like, and which construction or excessively worn, it is necessary to remove the defective element and replace it‘ with one in prop- permits 0f the Shank being formed with a soft metal base that is easily Welded With no risk of cracking in applying the shank to the roller, and also permits of the'ifoot being formed‘ of a hard- 20 of‘ a tamping element is a laborious and time con- ened wear-resistant metal, such as a heat treated sumi-ng task and accordingly a costly operation, and furthermore is difficult of accomplishment by ireason ‘of! the ‘necessity of reforming a replace- steelgand the wearing tread surface of the sheep foot tamper being ‘rendered far more resistant to abrasions than in the ordinary‘ construction now , “ment tamperelem'ent to conform to the other 'tampers on'the roller which may be considerably generally employed. ' 95 A further object is to provide a 'demountable 'worn'an'd'out of conformity with an" added new foot for sheep foot tampers together with an as ‘tampe'r. Furthermore it has been the practice'to sociated shank formed for telescopic engagement form" the tamper ‘foot with a tamping area of ap30 proximately six square inches'which area is diminished: under wear. When ‘the vseat has worn away to re'ducethe'tamping areafto approximately five‘ square inches the tampingfoo-t is considered "useless, and as a’consequenc'e it becomes neces35 sary ‘when the tempers on a roller have'becom'e excessively worn to 'either discard the roller with its-'asse'mblage'of tampers, or to re?t the’roller with 'a'complete assemblage of new tampers, either of ‘which involve considerable’expense. ,In repairing worn tampers it is ‘necessary to with ‘the foot, including means embodied in the joint ‘whereby proper interconnection of the foot 30 on the shank and also proper positioning of the foot on the shank will be insured, and whereby ad justment to effect alignment of the foot vportion on the shank is rendered unnecessary. With the foregoing‘objects in view together with 35 such other objects and advantages as may subse quently appear, the invention‘is' carried into effect as hereinafter fully described, and as illustrated 'by way of example in the accompanying drawing,v in which: 40 build up ‘the worn, portion by welding operation andwhere a'number of the tamper feet'on a roller are badly worn, it is not acceptable to‘ weld new Fig. 1 is a view in side elevation of a sheep foot tamper depicting the manner of assembling the parts; portions being broken away to show parts in ones here‘ and there on the ‘roller ‘as such new cross'section; 45 "tampers would be considerably longer than the oldon'e's which would-preclude proper tamping ac‘tion of the roller. rIYhe present invention'is designed to‘ obviate the objectionable features incident ‘to the ‘ordinary 50 sheep foot ‘campers above pointed‘out, and has 'as its ‘primary ‘object the provision ‘of a construction whereby any one or more of the-feet of the tamping Iroller may be readily removed and replaced and whereby a renewed foot of a tamp- v55 ing "element may be easily conformed to the feet CH newal may beeffected in the ?eld with simple ‘event-any of the tamper elements become broken e'rico‘nditioni, otherwise the el?ciency of the tamp‘:0 'ing roller ‘is impaired. Ordinarily such removal 40 performing weld operations, and whereby such re ' Fig. 2 is a perspective view of the tamper shank; 45 Fig. 3 is a perspective view of the tamper foot; Fig. 4 is a view in end elevation of a fragmen vtary portion of a tamping roller showing it as equipped with the sheep foot tampi'ng ‘elements. Referring to the drawing more speci?cally, A 50 indicates generally theshank of the sheep foot tamper'and B designates the-demountable tamper foot. y , In carrying out the invention the‘ shank A is jprmed- ofv ductile cast steel, whereby the tamper s55 2 2,131,947 shank is rendered subject to being readily mount ed on the periphery of a cylindrical roller C as indicated in Fig. 4 by a weld joint, and the foot element B is formed of heat treated cast steel Cl whereby the shoe B is rendered resistant to abrasive wear. The shank A is formed with an elongated ta pered body portion 6 of general frusto-conical form having a taper of low pitch, the shank be ing here shown as having its outer surface ex tending at an angle of four degrees relative to the plane of the axis of the shank. The en the shank in telescopic engagement therewith as shown in Fig. l, the foot being driven into tight, wedge or tapered engagement with the outer end portion of the shank and being aligned thereon as before described. .In event it becomes necessary to remove and replace any one or more of the tamping feet B it is only necessary ineffecting removal of a foot to drive it outwardly longitudinally. of the shank to free it from the latter, and on thus 10 being removed another foot may be quickly posi tioned on the shank. In this fashion all of the larged end portion of the shankis formed with ' tamping feet on a roller may be readily renewed. an arcuate ?ange 1 having a concave bearing Furthermore the renewed tamping feet if not surface 8 formed to conform to the curvature of excessively worn may be reconditioned by build. the periphery of the cylindrical roller C.' . ing up the worn portion by the usual welding ‘ The tamping foot B embodies a collar 9 of operation. general cylindrical contour, the inner periphery When it becomes necessary to replace a worn of which is tapered to conform to the» taper of or broken foot the replacement foot may be 20 the shank; the collar being designed to receive readily formed to conform with the feet on ad the outer end of the tapered'shank 6' and ‘to jacent vshanks so ‘as to. extend on a plane have wedged frictional engagement therewith. therewith. _ 15 ~ 20 Iclaim: ' '“The tamping foot B further embodies a tread portion l0 formed integral with the collar 9 1. In a sheep foot tamper, a ductile metallic 25 which tread portion is formed with an arcuate ' shank formed with a base suitable for welding 25 outer face ‘H formed on a curvature which when onto a cylindrical metallic roller, and a'tamping the tamping foot is mounted on the shank and the latter a?ixed to the roller C will extend in the direction of the circumferential length of 30 the cylindrical ‘roller‘ concentric with the axis of the latter. ~The tread face ll is straight transversely and terminates ‘at its rear end in foot formed with a collar‘having detachable tele scopic wedge engagement with the outerend of said shank, and means embodied in the tele scoped interconnection of said shank and foot for aligning the foot on the shank. ' ' ‘ 2. A sheep foot tamper comprising a shank formed of ductile metal and ‘having a tapered a heel .l2 and at its forward end in a toe M, which heel and toe portions are rounded in con ' outer end portion of low pitch, and a hardened tinuation of the tread face of the foot such as metal tamping foot formed with a collar having 5" to impart to the end faces of the foot a stream lined contour whereby on rotating. the roller B the tread will be brought in and out of contact ‘with the surface being contacted with a minimum of disturbance of the compacted material. In mounting the tamping feet on the shanks they are disposed with their heel portions l2 positioned to extend in the direction of rotation of the roller with the transverse straight faces 45 of the treads thereof extending in the direction of. the. length’ of the roller.' ‘ - . It being quite important that‘the foot mem bers be ‘properlyaligned on the‘ shank and dis posed with the heel portion thereof forwardmost, means are provided for insuring application of thefoot to the shank in proper relative relation thereto. This means is here shown as embody ing ‘a straight flat surface l5 formed onthe tip portion of the shank and extending diagonally 55 from the reduced end of the shank and also em bodying a correspondingly contoured ?llet l6 formed on the inner periphery of the collar 9 whereby‘ on inserting the reduced ‘end of the shank into ‘the collar 9 it can only be brought 60 to its'seated position in the latter when‘the flat face l5"on the shank is brought into parallel ‘relation to the ?at face of the ?llet I6. As here shown the ‘flat face l5.and ?llet iii are formed on the forwardmost portions of the shank and 65 ‘foot member; but manifestly maybe disposed ‘at any other tp‘oint around the periphery of the shank and foot member In theapplication and operation of the inven tion the ductile shanks 'A'are affixed to the outer periphery of the cylindrical rollers C to project radiallytherefrom, being attached to the roller by welding the arcuate face 8 tothe circumfer ential surface of the roller. "is ‘ After thus a?ixing the shank A to the roller the tread foot'B is applied to the outer end of an internal taper to conform to the taper of said shank, said tamping foot being driven onto said shank in frictional wedge engagement therewith, said shank having a diagonally extending ?at face leading from the reduced end thereof, and 40 said collar being formed with an internal ?llet having a flat face conforming to the ?at face on said shank. ‘ 3. A sheep foot tamper comprising a shank formed with a base of ductile metal, and having 45 a tapered outer end portion formed with a flat face extending diagonally from. the reduced end 'of the'shank, and a hardened tamping foot formed with a collar having an internal taper conform ing to the tapered end portion of said shank‘ and having a ?llet arranged to conform to and en gage with the ?at face on said shank. 4. In a tamping roller, a metallic cylinder, a series of sheep foot tampers carried on ‘the pe riphery of said cylinder each of which embodies a shank‘formed with a ductile metal base affixed to the cylinder by a weld joint, said shank having a tapered outer end portion formed with a flat face extending diagonally from the reduced end of the shank, a demountable hardened. metal tamping‘foot formed with a collar telescopically carried on the outer end of said shank, said col lar having an internal taper conforming to and engaging with the tapered outer end of ‘said shank, said tamping shoe having an arcuate tread 65 face formed on an arc concentric with the axis of said roller, and a ?llet in said collar arranged to engage the ?at face on said shank to align the foot thereon with its arcuate tread extending in ‘ parallel relation to the circumference of said 70 roller, said foot being held on said shank solely by frictional engagement therewith and being adapted to be detached therefrom by driving the foot outwardly longitudinally of said shank. 5. In a sheep-foot roller tamper. a metallic cy 75 2,131,947 ' 3 ' lindrical roller, a series of tamper shanks, arou shank on which it is carried, each of said tampers ' ate bases formed on said shanks seating on and‘ being formed with an arcuate tread face termi nating in curved heel and toe portions, and co operating means on said shanks and collars for secured to the outer periphery of said roller, said shanks having tapered outer ends of low pitch to each other, a sheep-foot tamper detachably positioning and maintaining said tampers with the arcuate tread faces thereof extending in the carried on each of said shanks formed with a direction of the circumference of said roller. and being of complementary dimensions relative collar having an internal taper conformable to and frictionally engaging the tapered end of the GORDON M. GILMORE.