claim: 1. In combination with a bulldozer having a boom su I pportink a fixed material pusher blade; a shovel attachment comprising a base plate fixed biatween spaced side plates near their outer ends, said sidib piates embracing the pusher blade, and pivdt@ c6nnecting the side plates near their inner ends with the blade, the distance between the aiis of the pivots and the upper edge of the blade being less than the distance betweeii said axis and the inner edge of the basi@ plate whereby the shovel attachiiient may be swung -fr6m iridperative position ii-i which thi@ ba'se plat& j:ests upon the top of the boom in i6ar oi, tli @e arm 6f @ bell crank-49 mounted bn the frame y blade, into operative position in which the b,@Ls@e @o 28. 'ihe bell crankg 49 are - 6onne@te,d to two -plate underlies the blade ektending in, bdvance iuither bell cranks 50 in the frame 28 by rbds thereof, @@id blade formiii the rea:@tioii 'abut@. 9 52 and the bell c@anks 50 are connocted to spr,.ngs ment of the shovel attachiiient w'hen in oper@ @tiv @e 54 which tend to keep th@ stops 44 in the posi- positidn. tion showii in Flg. 2. In order to turn the bell 2 2'. Iri z@ combination as'set forth I in claini 1, ciiinks against the@ actibn of the springs @4 and @aid side plates forining cheeks at the en . ds 'of roi'ract t-he sto 5 is provided the blad@e wh6n the shovel attil6hinent is syvu ps 44, a pedal bar 5 ng Nvh'@ch coni@ects the upp'er ends of two into inoperative pbsition. Vivotal@Isr iiiount,ed ainis 58 which are connecti@d to the 3. In combination 'th A buudozer havirig a wi bellcrank$, 50 by links 60. -0 boom supporting a fixed matorial pii siler.'b'la;de; Fig. 3- s.hows the machine prepar6d for use as a shovel attachment 6amb@ising a b"e plate a powi@r sh6Vel. in order to pick UP a load such fixed between spa;ced s@i'd@e Platb8 near theii , bix@6r for exara@le, as looge 0-dal, tlie machitle is ad-7 ends, @blid sid6 plbte@ enibr'ab'mg the @qsh6i biii@cie 'that the shovel, slides, on the grouhd I vanced so pivots cohbecting the sid'e. plates iieor th ir iiih@ e er beneath the pile of coal. When the shovel has 35 i@nds With, the blad6, the di@taiic'e bL-tw'ee'n' th6 received its lo@q, the boorn (@8 is rai@ed by the axis, bf thle pivots and the u@@er efte, (if thb 6librator by tetttng@ the lever 24. The load caii blace belng 16ss than the di tariee betw'ee'n 's@rd I s tti6i@ be transp6ited to @,n@ desired plade. In axis and the inner edge 'o-t t@e bd 6 Iji@te whereorder to dum the load, the operator di@' ress@s by the shovel att eiit p p achm mby bo sktirig f-rbm the pedal- 5-,.S so that ' the stops 4.4 are v,,it awn, 40 inbperative position in which the bagi6 pi@ed *Iiereti@on, the front end 6f the shovei ]':'s low- re8t,s upbii the top of the bb6ih iii r6@ii@ b f ' t h e e r d d i i r i d e k t h e w e i g h t o f t h e l o a d a @ s h o w i i i i i b l a a e , . i h t o ! o n i i i W h i - c h t h b a @ 6 bderative posit p PlatO uhderl@es the blade,. samei dxte 31 tidn h *iien, the lb,@id has been- dumped and ihe' shovel nd ub@tbritiall vaiiee thereof a s y pArA]I'el With is@ be re-set in the positioti showl'i in Fi.a., 3, - 4,i-) the ' .@aid bdojii, sa@id- blade forriiing theie@Eiciio-n it@ is :nec@e@sary only to ielease th6 l@edal St, aia(l abutn!6iit of the shdv6l attachment, a i i d . r @ l p w o r t h e b o o i n . W h e n , t h e s h 6 v e l t o i l d h e @ t h e l e a s a b l ' e - i h e a l - i s f 6 r y i e l d a b l @ r i j t @ , i i i i r i g t l i 6 @ h b @ 6 i g r o u n d , ' i t w i l l b e @ W u n g o n i t g p i v o t s 3 8 a n dattadhraent in said cipeiative- p'o'-sitio'n,.- its..stops, 42 will, force thd stops 4,4' backtards I. Iii a coinbination a@ @ ; 'th - ' -'I' - "' 3' set fbr in- c aim AgEiLinst the aqtioxi of, the springg 64, the stop @@dd' - @ia plat.0s. f-o ini - ;" ks @'& 50 , r nk 6h@t '. at thd.. en . of being provided- With @roiifided no@e8 as showti at th'e. blade' li@h6ri tht-, sh6,Vel@ a'ttiiehi)@i'@';n"t i@' '@W'tffi' g@ 6Z. t!fie-,@toli!@ 42--tl-@en- ei@gage below the @stop,, ; . into iiiop'er,-ati-v,e- ' p- O'siti'o'n'. 44 gzid- the sho*.el is again ready. f6r usE@- a -COmblia.@ti@ciii as s 'elt f-6 th. iii cl'ii@ *@hen the'riiachine is:to be used for bulldo@in,-, said. r6t--inifig iii@Ans Oihpi@i8iii fl cL 't . ! 9 x e s . o p s c a r @ - thit i@ to say, pu@hi-nk tho inatoriai b6io@e- it, 55 rieq, b@. thd shd@r , tdc@hiii6jit a ap el. at d@, tdct.tb_ lidtt]@6 ' sh6vel att'a'ch@mei@t, i's moV,@ci@olit of tii6 V'I.,qy i@iqil,y@ ii-aderL@-- rbl&asdbl6 st,oi@s, I:i@, the bi beiiig swung- on its, piv6is seback into. the biadt@.@ '@t n o*n ii-i @]Ng 4. Thi@ in,6venient, oi the poi2 -fo - sh n n. 6,tib Witli a@, bWld6idi li@' vmg, a shi6ve@ can be effected quite Q6,sily by-.ha:iid if qill aupP.Or in-, a. g ame. cari@ym a- ma,- a@ is shown in the-cfra*ing's, t-lie,,,@hovoi@is rda8oD@ teridl @U@het bi4de,-, b@- s ovel@ atta&hm 6ht: 66,iir ably )7@Alance,d abo-ut the a)tis of'iti , pivQt8. Al@ Prigila-., a base- i):la6, fi@@&ct b6-tW6bii "d ace side terriati-vely, - a, sfi4ple- arrb;ngeme@nt,6f. a, c blO Iii' @16tes. PUt.( @s their dlit6i., 'end's',, !@did. @ii passing over- one, Qr :more nearthe@ driv 6i)4b)@4cing tlie- i@.iish6t. bliide,, @ivdti @"@ ' - ' - f COJIMC er'.-- seat can 6e 9-1@rangect to@ e,n@ble i4e@ driver iiii@ th6 @id6 M:@tes.. ri6di, ihei'r' irmer en to- eff e@t- the reve rsa@l, wiihoiit le@@4irit his seat.. i-he fi-din6,, i t l i 6 , It %,ill be- app@eefo@iecf, th-ai th'ei)r6vi@ion of the@ @i- @y-@o'ts, a'ild. the uppei, e o f , e d e 1 : ; 6 f i i ' 9 ! C L thli shovel attachm6nt does. nldf, InVOI-@tf 6,iiy le. :@, tlidn, th@ di@iiiiice. li.6..tW6efi s@i ax'ls,, ahd, v6r@, majbr. a@lteratioif- ofthe norrii@ti. ]5iillcf6zer, tb,6. ffiiij@i, 6dg6. of. ilie @iii pla-t@@ @viii@iev@, ilie T-he wefght on the@ frorit ehd of tlib b'ooiyi f@.; of- @li6vbfEiita,,hme-nt,may be swung f om. inol)erfvr murse, in6iea@sed; by@ the@ shov'ei@ a@t-t-b@chnient. b@it 70 tfv@ @ i)'@ @sition. i -n- which the base. pl ate. rests, upon@ t-ho@t can be com ensated- by a edulite@w'ei@h,@,, tjid t6 @' bf. 1-n' , r&@r of tlie". blid6,. fiii p tlie, 15oo"m' c@ 64. oil the rear end- of the boLQm. 6-' @.at' - -- - ' - l@iefi ihe. b@ase- @tate iiii@ Pe ive- posi ion. in w It Will, E@lso be-, appreciated' that, ilxe provisioi! de@lie -I- the' bl'6d6, @' t S. ame,, ex ending i-n- a ancpnot a:dV tiie"e6@'e@nd@ sUb@t-Ari'i!aUy of. the, shovel does 4@rseiy E(ff@!c@t t)@@o- r . P i 3 @ r @ l l b l ' w i t h t h 6 - s i i l d emciericy of I the bulldoz6r wh6ii the I'atter is lised' 75' bob'M', said bl'ade fbrmifig the r6aetioii a@@utiji6iit@

Of the shovel attachment, means for retaining the shovel attachment in said operative position, and means for releasing said retaining means whereby the weight of the material on the base plate will pivot the base plate down- 5 wardly. 7. In a combination as set forth in claim 6, said side plates forming checks at the ends of the blade when the shovel attachment is swun.- in'to inoperative position. 10 8. In combination as set forth in claim 6, said retaining means comprising fixed stops carried by the shovel attachment adapted to normally underlie releasable stops carried by the frame. jr) 9. In a combination as set forth in claim 6, said retaining means comprising fixed stops carried by the side plates adapted to normally uiiderlie retractible stops carried by the frame; and said releasing means comprising a lever pivotetl on 20 said frame, and means controlled by said lever adapted to operate said retractible stops. 10. In combination with a bulldozer having a vertically pivotal boom supporting a fixed materi-al pusher blade; a shovel attachment com- 25 prising a base plate fixed between spaced side plates near their outer ends, said side plates embracing the pusher blade, pivots connectil-ig the side plates near their inner ends with the frame, the distance between the axis of the 30 pivots and the upper edge of the blade being less than the distance between s-aid ,Lxis and the inner edge of the base plate whereby the ; shovel attachment may be swung from inoperative position in Nvhich the base plate rests 35 upon the top of the boom in rear of the blade, ai-id into operative position in which the base plate underlies the blade extending in advance tliereof and substantially parallel with the said boom, said blade then forming the reaction abut- 40 ment of the shovel attachment, means for yieldably retaining the shovel attaclimont in said operative position when the boom is lowered to bring the base plate into contact with the ground, and means for releasing said retaining means when the boom is raised, whereby the weight of the material on the base plate will pivot the base plate downwardly to discharge the material in the shovel attachment. 11. In a combination as set forth in claim 10, said side plates forming checks at the ends of the blade when the shovel attachment is swung into inoperative position. 12. In a combination as set forth in claim 10, said retaining means comprising flxed stops carried by the side plates adapted to normally underlie retractible stops carried by the frame. 13. In a combination as set forth in claim 10, said retaining means comprising fixed stops carried by the side plates adapted to normally underlie retractible stops carried by the frame, and said releasing means comprising a lever pivoted on said frame, and means controlled by said lever and connected with said retractible stops. I GUY TAITE SHOOSMTH. REFERENCES CITED The following references are of record In the f'Ae of this patent: UNITED STATES PATENTS Numb er Name Date 2,227, 624 Benbo w et al --------- Jan. 7, 1941 2,249,356 Goodman ---------- July 15, 1941 2,309,223 Starring ------------ Jan. 26,1943 2,313,534 Gledhill ---------- Mar. 9, 1943 2,332,561 Drott ------------ Oct. 26, 1943 2,483,033 Baker ------------ Sept. 27, 1949 2,515,384 Von Camop -------- July 18, 1950 2,529,208 Andersen ---------- Nov. 7, 1950

Patented June 3, 1952 21599,491 UNITED STATES PATENT OFFICE':@, 2,599,491 CONVERTIBLE BULLDOZER OR SHOVEL Guy Taite Shoosmith, Chislehurst England Application September 20, 1948, Serial No 50,139 ]In Great Britain September 3, 194i 13 Claims. (Cl. 37-117.5) Thi8 invention relates to bulldozers. There;are many occasions where a bulldozer is used that material has to be picked up and deposited elsewhere-a job for which the bulldozer is not d6signed. 5 The in,@ention is concerned with the modification of the bulldozer to enablc, it to be used, when desired also as a shovel. Bulldozers are available today which can be converted for use as power shovels by dismaiitling 10 the bleide ond replacing it by a shovel. The c6n'version is an operation which takes up a lot of time and is one which is not intended to be effected at frequent intervals. A suggestion has also been made to provide a 15 tractor with a composite blade pivotally mounted on the front end of a boom so that it could be brought into a more or less vertical position and into a more or less horizontal pdsition, the blade acting as a scraper in the one position and as 20 a scoop in the other. A machine of this type suffers from the disadvantage that it is efficient in neither of its two roles. The machine in accordance with the invention can be used as a bulidozer or as a shovel 2,5 without any dismantling or replacement of parts and is equally efficient in each of its two roles. The invention consists of a bulldozer having a boom vihich carries the usual blade and also carries an attachment which can be swung down 30 in front of the blade to serve as a shovel and up into an inoperative position in which it lies on top of the boom and allows the blade to be used in the ordinary way. The shovel -attachment can be a complete 35 sho,vel in itself, that is to say, have a base plate, a back plate and a pair 6f side plates but, preferably, it hAs only a base plate!and a pair of side plates, the buudozing blade forming the back plate when the machine is in use as a shovel. 40 It is usual for a bulldozer blade to be provided with narrow side plates or cheeks and, in the preferred form of machine in-accordance with the invention, the side plates of the shovel attachment provide those cheeks when the attach- 45 me,nt is in the inoperative position. The blade can be designed and mounted without regard to.any consideration other than its effectiveness for its primary purpose, viz.: that of pushing loose material in front of it. The 50 shovel attachment can be similarly designed having regard to its function and can be mounted so that the boom provides the reaction abutment when the machine is in use as a shovel. The combination bulldozer-shovel according to the inven- 55 ti6n can, therefore, be@equally efficient in 61@ther of its two roles. The shovel attachment can be mounted on sijnple pivots and requires only a simple pivotal movement to bring it into and out of. lits'operative and inoperative positions. 60 This movement can be effected by the@ operatbr-without involving any disma4tUng or replace-. ment of parts and, therefore, the. machine oan, be switcheci from one role to, a@noth6@ without-, waste of time. Mec hanical-meaiis'ean be pr(:. vided for swing'mg the shovel, a-ttachmen-t from one position to the other but such mea 0 .1 =, sire n t, es ential as the attachment can be, sQ@ balan(@@d that it can be turned,quite easily by ha@id., The machine in accordance with the tiavention can be put to many different uses. It has, however, been designed particularly for @ handling such materials as loos al 0 e co , ne of the important problems which it has solved is that of expeditiously trimming ships' cargoes. In order that the inventi6n may be thoroughly understood an example of a bulldozer 'm accordance with it wfli now be described with reference to th6 accoinpanying drawings in which: Fig. I is an elevation of the machi,ne. Fig. 2 is a plan of the machine. Figs. 3-5 are detail views showing the boom and its blade and shov6l in different - working positions. The bulldoz6r shown in the drawings is of a usual design having a pair of tracks I 8 drranged round spiockets 12 driven by an engine 14 housed in the body I 6. The body supports a boom 18 wbich is pivotally mounted at 20 and whidh'can be raised and lowered by means. not shown in detail in the drawings but comprising a pump 21 which is controlled through a valve 22 having a control le'ver 24 situated within reach of the operator who sits on the seat 26. At its front end, the boom 18 has fixed to it a frame 28 which carries the blade 30. The above-mentioned arrangement 6f parts is@. common to all normal bulldozers. The blade 3 0 serves to push loose material bbfore the macliine and call be brought into the most appropriate,.. position by altering the 'Melination 6f the boom... In order that the machine may he used for. picking up material as well as pushing material,@ before it, a sh6vel att@chment 32 is provided;, This attachment has a base plate 34 and a pair.@ of side plates 36 but no back plate. The side plates 36 are mounted on pivots 38 projecting, inwardg from a pair of brackets 40 on the frame 28. The shovel attachment 32 has two positions viz.: an inoperative Position shown in Fig. 4@ and an operative position shown in Mg. 3. In the 'moperative position ' the shovei attachment lies on top of the boom 18 and allows the. blade 30 to be used for "dozing" in the ordinary Way. It is completely out of the way and does not interfere at all with the normal use of the blade. It is not unusual for bulldozer blades to be provided with side cheeks which prevent the material which is being Pushed along from escaping round the ends of the blade.. The side@

3 plates 36 of the sh6vel attachment servo to form such side cheeks when the attachment is in its inoperattvp position as shown in Fig. 4. In it@ bperative position, the shovel attachment is @wung down ih front of the blade iis sho,#n in Mgs. 1 and 3. It is retained in that position by the -abutment of a pair of stops 42 on it against a pair of stops 44 on the frame 28. It forms a shovel together with the blade 30 whic,h closes the space between the base plate 34 ahd 10 the side plates 36. In order to ensure that this space will be properly closed, th6 blade is Provided along its lower edge with an adjustable part 46. In order that the contents of the shovel may 15 be dumped, the stops 44 are mounted so that th&y @cb@ii -be moved 6 -ut of the way of the @tops 41. A@ @'caii bo seen from 14g8. I and 2, :each ,of th 6 s@t6p :44 is pivotally i@onnected to @one s 2,590,491 4 in its Primory tole of pushing niaterial before it. Fur ' thermore, the shovelling efficiency is not adversely affected by the presence of the blade which together with the bbom provides a positive rdactioi-i abiitinent f6r the shovel, I