US 1990163 A
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Description (OCR text may contain errors)
Feb. 5, 1935. 1 BLACKBURN Er AL v I 1,990,163
Filed Jan. 18, 1955 2 sheets-sheet 1 Feb. 5, 1935.
J. BLACKBURN ET AL HoIsT Filed Jan. 18, 1953 2 snelste-sheet 2 Patented Feb. 5, 1935 v UNlTll'l)v STATES PATE T OFFICE HOIST Jasper Blackburn and JamesA. Weaver, Jr., y Webster' Groves, Mo.
Application January 18,1933, SerialNo. 652,272
z claims.- (o1. 2547-1) vThis invention relates to hoists, lifts and jacks,
and supporting yhousings therefor.
The principal object of the invention is to provide in a device of the kind referred to, an elongated, divided housing including complemental base and cover sections, means for releasably securing the sections together, the sections jointly providing at one end a spring cylinder extended axially and having a rod aperture thru its outer end and afscale slot thru one wall, and at the opposite end a worin gear and sprocket socket, there being spaced sprocket chain slots thru the outer end wall of the socket, and a transversely extended worm-way thru the inner walls of `the said socket, between the spring cylinder and the worm gear and sprocket socket.
Another object is to provide 1n a kind referred to, an elongated, two-part housplemental base yand cover sections, means'for re-l leasably securing the sections together, there being interiorly provided at one end'of the housing an axially extended spring cylinder, and at the socket for receiving Vaworm gear'and, chain sprocket, there being spaced sprocket chain slots thru the end thereof r)for engaging a sprocket chain, and a transversely extended wormway cutting thru the' inner walls of the said socket for engaging aworrn forfoperating a gear as refe'rred to' as mounted in thej said socket. e VWith these and such other objects and advantages in View as may appear in the course of the following specification, attention is `now directed to the accompanying drawings wherein is embodiedone preferredf'forin' of our'invention,and wherein 1 y i yFigure 1 is aside elevation of thehoist as made andi assembled in accordance with this iinvenf` 151011, n
Figure 2 is a ure1. M
Figure 3 is a longitudinal section throughv the 4, housing which contains the main ,elements of the invention, taken on a plane perpendicular to the section of `Figure -2,r and being considerably yenlarged. Y. l n
Figure 4 is aside elevation of the assembly 50 shown in Figure 3,-the left-hand end of the housing being broken away. n i
Figure 5 is a detail plan view, -partly in .section of amedial portion of the housing carryingthe slidably mounted worm lockor'latch; the ends 55 ofthe housing 4being broken away.
sectionon'thev 2"-2 of Figdevice of the ing, dividedlongitudinally and :comprising corn opposite end an axially alignedgear andsprocket` Figure s is a. section on the une e-e of. Figure 5. `V j Figure I'I is a detail in perspective of onen'of the` bearing blocks, the same being shown conf siderably enlarged. I 5
Figure S isa section on the line 8-8 of Figure 1.
The invention according to the embodiment represented in the present drawings, comprises an elongated, sectional or :divided housing, frame or support 1, including what may be termeda base or main section 2 and a cap or cover section 3, the two sections being complemental koneto the'otherand being secured or fastened-together by means of set screws 4passed into protruding 15 ears lor tabs or flanges 5in a conventional mannenv In one end of thishousing-is formed the .i springfcylinder 6, the same beingclosed by end walls '7 and 8, except that the'outer end wall' is pierced centrally'or axially bythe pin orI rod` aperture 9. .Ihewall offl this spring cylinder is slotted longitudinally; asshovvn at 10,v the same A forming a scale slot, and the adjacent margins ofthe slot is scale-marked or calibratedfrom end to end of the slot,` as shown at 11.` Acoil spring 12 is freely seated within thel cylinder V6 anda pin or rod 13 is passed `down through' the i end. aperture 9 and through the coils;of:the spring,
the inner end of the pin being providedy with a headr or nut 14 adapted to. seat Vupaga'inst 'a1 30 washer. 15 which `bears upon'the inner endof the sprin'g 12'. fA pointer 16 extends-from'the washer out throughrthe -slot 10 and is thus arranged to movealong the slot over the scale marks Y 11, as the spring 12 expands or contracts.V` The 35 outer end of the pin or rond 13 is formed into a.' hook 17 for engaging a load or a support, as indiycated at 18 in Figure 1, or for any similarpury pose as may be required inthe use of the tool;
The opposite end of the housing is formed with 40 a gear andv sprocket socket or seat 19,` sprocket slots 20 leading out throughftheend, La-transversely` extended wormlway 21 cuttingL through the inner [walls of ,the socket 19, the bearing block slide-ways 22 ,at the endsof thesaidwormjway, 45
the worm latch slide-Way` 23 alongr the inner margin of the Worm-way and the spring pockets 24 formed infopposite walls of the socket Y19 in alignment with the slide-ways 22, Within the socket 19 is. rotatably mounted a" unitary as- 50 sembly comprising a short axle 25, a worm gear 26 and a sprocket or sprocket wheel 27 .onxthe axle and preferablyintegrallyformed therewith for the sake of strength. The ends `of ythe axleY are journaled preferably in roller bearings'28" the said socket 19.
through oneof the s is squared olf at the end 38 for engaging the slots 20 over thesprocket 27, the separator lugy 29 serving for facilitating the insertion of the chain and for preventing its becoming lockedLf The two ends of the chain 31 are provided with.V
Work engaging hooks 17a and 17b. A worm 32 is extended through the worm-way 21j; theends thereof being preferably Yjou'rnaled in roller, bearslidable bearingv blocks.` 34,.
ings 33 mounted in which are turned out as shown at 35 to provide the necessary races for the roller bearing rings. The blocks 34 are formed with beveled cams 36 which areV turned-' inwardly towards the l latch slideway 23 and arranged to stand in alignment therewith; Oneend of the worm shaft is extendedl out blocks 34, as shown atV 37 and operating 1ever'39 .for turning the worm, The blocks 34 are confined against outward lateral movement by means of side plates 40` secured in placeby set screws 4l, one of the platesr being `aperturedfas.shownat 42 for passing the outer end; ofthe worm shaft. i The beveledl or ared formation of the races 35and the bearings 33 seated therein, prevent the inward lateral movef` ment of ,the blocks 34, sothat they are, freeto move'withinf their slide-ways only towards or 19, whereby `the worm `is way and additionally by meansV of a pin 46 seated inthe face ofthe slideway and extended recessed toform beveledVv cams 48*complemental to fand adapted to coact with thecams 36 of the blocks 34 forpressingy the Ysaid blocksY outwardly againstfthe action of the springs 43, thus causing the'worm 32'to mesh-with the gear26, as the latch "45 is pushedl inf for that purpose., In such operation the beveled surfaces of the respective cams, which are arranged in properl alignment as shown in Figure 3, ride or slide over one another `upon the inward movement ofthe latch,
thusforcing theblocks 34 outwardly to' the limit ofthe bevels of the cams, after which theladja- Y centsidemargins or edges of thelatchcams and bearing block cams pass into engagement with` one another, asV indicated at 49 in Figure 3, thus lockingjtheelements n'that xed frelatin until theV latch is drawn outward again. The outer (ir-operatingV end of the latch 45 is provided; with around shank 50 loosely pinned at v5 1 to the. end ofthe latch. Upon this shank is rotatably mounted a knob v52 which is vbored out axially asshown 1,990,163v Y i,
at 53 for receiving the shank. 'I'he knob 52 is spring-set to tend to turn in an anti-clockwise diy rection, by means of a coil spring 54 seated over the shank and braced or secured at its ends to the knob and shank respectively. A sleeve 55 lis extended laterally from the housing 1 in align-v ment with the latch slide-way 23 for vfreely receiving the inner end of the knob'and within which sleeve the knob is adapted to rotate. Within this inner end of the knob isformed a U- shaped groove 56-56a-56b having its legs openinginwardly towards the housing, the inner vor *bottom side of one leg of this groove being sloped up to form an outwardly disposedr shoulder 57. The arrangement ofthis element is shown in Figure 5.Y The groove 56 isadapted` to engage a spring-set stud 58, seated through a bore 59 `formedv throughthesleeve 55 and a lateral lug 6()V formed on the sleeve, the outer end of the bore being enlarged and threaded to receive a screw 61 which carries the coil spring 62,fthe"1at s ter functioning to force thestudioutwardly into the groove 56. The arrangementis such that by rotating the knob 52 clockwise Ywithin the sleeve 55 against the action ofthe springt 54, the sloping legj56b of the groove 56 may be brought into ,alignment with the stud 58, thus permitting the latch45 to be thrust inwardly, in which operation the vstudpasses up over the sloped bottom side'of the leg'andsnaps Aback. of
the-shoulder 57, thus locking the latch tofits in,-
ward position. When itis desired to draw the latch kout again, the knob is rotated clockwisey to bring the uniform leg 56a ofl the groove 56 into alignment with thestud, which permits `the withdrawal of thelatch as the Vstud travels readily 'through` said groove.` f f In useand operation as for raising a load;` the housing y1 is 4disposed in .a pendant,` manner and the lower hook-17 iswplaced in engagement with the load or work 18. -One of the upper hooks, as 17a, is then placed in engagement with a suit-v able overheadsupport,l represented atgla in Figurel.. By thenrotating the worm `32 in the proper direction, Athrough the useof thelever 39 appliedto thesquared end 38-of the wormjshaft 37, the sprocket chainr'31 is fedj through the housing 1, passing over the sprocket x27 vand y through the slots 20, whereby the length of 'chain 31a is drawn taut and the loadis raised.` After the housing has traversed the length of chain 31a up to the hook 17a, the length of chain represented at 31b`is stretched upward and the hook 17b7placed in engagement with the support at a higher point. VVThe hook 17a is then released and by then rotating the worm `32 ina reverse direc.; tion, the load 18 is carried to a higher-point. 'I his process is repeated until the load is elevated to the point desired., WhileL the use of the device is here illustrated through its application to elevating a. load,y it is obvious that the tool may be readily adapted for moving a load in a horizontal line as for stretchingline wires orcables orA any similar, use, through the proper arrangement `and engagement of .the several work-hooks.
It is 1 apparent f that this tool Vor hoisty possesses very great power inasmuchas the wormis rotated by a lever at ,great'mechanical advantage, and the worml in turn" ai'ords further mechanical advantage over theA gearand sprocketwheels which pull the'sprocketrchainand attached loads.
Furthermore, the ratio of mechanical movement between the worm and gear is so great thaty the worm serves to lock the gear against any reverse movement, no matter ihow great the load that is being raised or carried, thus enabling each length of chain 17a, or 17h successively to sustain the load while the other length of chain is being attached to a higher or more advanced point.
Thus the worm may be rotated and the chain caused to travel in either direction through the housing, with equal facility. This provides a step b-y step mechanism for raising loads` or doing similar work, which is much superior vto other conventional devices of the kind. y
For quick readjustment of the chain and hooks, the 'Worm latch is released inmanner already pointed out, thereby releasing the worm from its gear, after which the chain may be rapidly passed through the housing `ineither direction. The structure is also arranged with the working elements upon which stresses are imposed, all substantially in axial alignment, as shown in the drawings, and with the operating lever disposed laterally at the end of the Worm shaft, in` the most convenient position.
While we have herein shown and described in a general way a certain preferred form Orem,- bodiment of our invention and the several elements and structural features thereof, it is understood that we may vary any'of the elements by employing equivalents thereof, and mayvary or change any ofthe structural features shown in any matters or details, Within the scope of our invention as defined inthe `appended claims.
1. In a device of the kind described, an elongated divided housing including a. b-ase section and a cover section, the two sections being complemental one to the other, means for releasably securing the two sections together, the two secj tions of housing providing at the opposite .end a tions jointly providing at one end a spring cylin-y Worm gear and sprocket socket within which ka worm gear and chain sprocket may be mounted, there being spaced sprocket chainslots leading thru the outer end wall ,thereof and thru which a sprocket chain may be extended, and a transversely extended worm-way cutting thru 'the inner walls of the Worm gear and sprocket socket and thru which a worm may be extended in operative engagement with a Wormgear as referred to as mounted within the said worm gear and sprocket socket.
2. In a device of the kind described, an elon gated two-part housing, the same being divided on longitudinal lines and comprising a bas-e secr tion and a cover section, means for releasably securing the two sections together, there being interiorly provided at one end of the two-part housing a longitudinally extended' spring cylinder, and at the'opposite end a gear and sprocket socket for receiving a Worm gear and ,chain sprocket, there being spaced sprocket chain slots leading out thru one end wall thereof thru which a walls of the gear and sprocket socket and thru lwhich a Worm may be extended 'for operating a gear as referred to as mounted within the said gear and sprocket socket.
. JASPER BLACKBURN.
JAMES. WEAVER, JR.