US2667331A - Electric hoist - Google Patents

Description

Jan. 26, 1954 E. E. RoBlNs ETAL 2,667,331

ELECTRIC HOIST Filed July s1. 1951 s sheets-sheet 2 INVENTORS By Hum/mfg f.' Flr/fer Jam 26, 1954 E. E. RoBlNs ET AL 2,667,331

ELECTRIC HOIST Filed July 31 1951 3 Sheets-Sheet 5 INVENTORS Patented Jan. 26, 1954 ELECTRIC HOIST Erford E. Robins, North Tonawanda, and Hum.- phrey F. Parker, Buialo, N. Y., assignors to Columbus McKinnon Chain Corporation, Tonawanda, N. Y.

Application July 31, 1951, Serial No. 239,594

' 140mm. (c1. 254-168) This invention relates to hoists, and more particularly to light weight motorized hoists of the type adapted to be suspended by means of hooks or brackets from suitable supports, for the purpose of lifting loads in the various industries.

In hoists of the character described it is of course well known that utmost compactness in relative arrangement of the several necessary components of such mechanisms is a prime consideration, in the interests of minimizing the length and width and head room dimensions and overall weight of such devices. It is also known that devices of the character described may now be designed to include frame elements which are die cast from the relatively light weight metals, while some of the load and wear carrying components thereof are preferably formed of heavier metals which may be mounted in the frame structures in the form of inserts therein.

It is an object of the present invention to provide in a hoist of the character described an improved structural arrangement whereby the load carrying and wear receiving hard metal portions thereof and the light weight die cast metal frame and cover portions thereof may be separately fabricated and then relatively assembled with improved facility while at the same time providing a complete hoist mechanism of utmost strength and ruggedness.

Another object of the invention is to provide a hoist mechanism as aforesaid, which is adapted to be disassembled and reassembled for repair and/or maintenance with utmost facility.

Another object of the invention is to provide an improved hoist mechanism of the character described which is readily convertible for use either as a single or double reeved type.

Another object of the invention is to provide in a hoist of the character described structural components of improved form whereby to facilitate initial assembly and/or subsequent service disassembly and reassembly of the mechanism.

Other objects and advantages of the invention will appear from the specication hereinafter.

In the drawing:

Fig. 1 is a side elevational View of a single reeved electric hoist mechanism of the invention, with portions broken away and shown in section to further illustrate the internal mechanism;

Fig. 2 is a section taken along line II-II of Fig. l;

Fig. 3 is a fragmentary section taken along line III-III of Fig. 2;

Fig. 4 is a fragmentary section taken along line IV-IV of Fig. 2;

Fig. 5 is an end elevational view of the hoist mechanism of Fig. 2 converted to double reeve type with portions broken away and showing the internal mechanism in section;

Fig. 6 is a sectional view corresponding to 2 of application of the the wire rope type;

Fig. invention in a hoist of Fig. 7 is a fragmentary section, on an enlarged scale, taken along line VII-VII of Fig. 6; and

F ig. 8 is a fragmentary section, on an enlarged scale, taken along line VIII-VIII of Fig. 6.

The invention is illustrated in Figs. 1 4to 5 inclusive as being embodied in a hoist mechanism comprising generally a pair of mating frame parts I0, I2; said frame parts being die cast of light weight metal such as a suitable aluminum or magnesium alloy or the like. At their inner faces, the frame pieces `lil-.I2 are formed with integral end plate portions I3, I4 which include thickened mating rim portions l5, I6 through which extend assembly bolts IB for holding the two frame parts together subsequent to assembly of the various mechanism components therein, as will be explained hereinafter.

As shown in Fig. l, the generally cylindrically shaped casing portion I0 is dimensioned to house the electric drive motor field windings and core 2t within which rotates the motor armature 2| to drive the motor shaft 22. As indicatedat 2A a ball bearing device rests within a suitable seat portion 25 of the end plate I3 of the frame meme ber it; and the reduced end portion of the motor shaft 22 is thereby carried by the bearing 24 for free rotation relative to the hoist frame. spline sleeve 26 is which is keyed to the load lift wheel 3,3. The

load uit when ss is rotatably mounted within the frame assembly by means of a pair of ball bearing devices Sli-35,' the ball bearing 34 lbeing mounted in a suitable seat portion of the end plate i3 while the 'bearing 35 is mounted in a seat portion of the end plate I4, aswill be explained in more detail hereinafter.

As shown in Fig. 2, the hoist load chain 36 trains over the load lift wheel 33 andat one end connects by means of a link 31 and pin 3,6 (Fig. 1) to the iooo uit hook en.

cared at ai into connection with o. deadheiid hanger ooit 42 (Figs. 2 and 5); the head and of the hanger bolt ,42 being embedded in mating recess portions of the frame e 3 2, 4) and vcooperating ledge portions 41 formed integrally with'the end plates I3, I4. Thus, the chain guide 44 is mounted to embrace the load lift chain 36 as it trains over the load lift wheel 33 incidental to operation of the hoist; the chainv guide 44 being fabricated of wear resistant'material such as steel or the like's'o as to Vthereby properly guide the chain While protecting. the hoist frame parts from wear. Y, Y

As shown in Figs. 1, 2, 3, the hoist suspension hook 50 is formed with a reduced shank portion 5I terminating in an enlarged head 52, and the shank portion 5I mating semi-cylindrical recess portions formed in the end wall portions of the frame members IB-I2. To provide a suitable load bearing for the enlarged head 52 against the split frame parts, we provide a generally U-shaped hard metal washer 54 which spans the juncture between the frame parts Ill-i2, and due to the U-shape thereof it may be readily slip-fitted upon the hook shank 5I during assembly of the parts and just prior to bolting of the two frame parts I5, I2 in mating relation about the hook shank. As indicated at 55 (Fig. 3), one side of the washer 54 is formed with an extending tab portion to mate with a correspondingly recessed portion of the frame piece I2 whereby to insure proper positioning of the washer and to lock the washer 54 against unintended slipping out of engagement with the hook shank and head portion 52.

As shown in Fig. l, a suitable automatically self-energizing load brake mechanism 6! is coupled to the outwardly extending end portion of the drive shaft 28 and arranged to be operated by means of a solenoid mechanism indicated generally at 52; the brake and solenoid mechanisms being conveniently housed within a suitable detachable cover 54. At the opposite end of the hoist the motor compartment may also be conveniently enclosed by means of a detachable end cover 65 with bolts 66; the end cover 65 including a motor end thrust bearing 51, and thus it will be seen that a symmetrically dimensioned and balanced hoist mechanism is readily provided wherein-the suspension hook and load lift wheel and load hook devices are all centered alongY the plane of juncture of the two main frame parts, while the driving motor is housed within one extending end portion of the housing structure and the gear reduction and load brake mechanisms are housed within the opposite extending end structure. Thus, an overall assembly of utmost compactness is achieved, and yet by virtue of the constructional arrangement of the invention the initial assembly and subsequent disassembly and/ or assembly operations greatly facilitated as will be understood from the following description of those operations.

For assembling of the mechanism of the invention, the bolts I3 are first slipped into place in the frame member I2, and the latter is then peened over the heads of the bolts to hold them from slipping out of place. The frame member I2 is then set upon a workbench with the inner end thereof facing upwardly, whereupon the load Wheel 33 with the bearings 35 is inserted therein. Preferably the bearings are designed to pressfit the load wheel shaft and to slip-fit freely into `the frame I2. The lower half portion of the chain guide 44 is then set into position. The hook 50 and the bearing washer 54 therefor, and the dead end bolt 42 and the hanger bolt 15 (if used) are then set into position to lie within arek of the hook is enclosed within l tion Yupon the bolts the appropriate recesses of the end fa'ce" of the yframe I2. The upper half of the chain guide 44 Y is then mounted in the frame piece I0, and the frame piece I0 is then lowered down into posi- I8 and the nuts thereof are tightened down to lock the frame parts lI-IZ together. The stator portion 25 of the motor is then slip-fitted into the frame I0 from the upper end thereof until it lodges in position against suitable stops formed therein, and is positionally locked as by means of a set screw Ii (Fig. l). The rotor sub assembly including the spline bushing iii-and the bearing 24 is then inserted into operative position. The end plate 55 carrying the rotor bearing 61 is then set in position and locked thereon by means of the bolts 66.

The assembly is then turned up-side-down on the workbench and the gear 32 is then lowered into the casing I2 into keyed position upon the load wheel shaft; a snap ring being then utilized to lock the gear on the shaft. The drive shaft 28 is then lowered into position, carrying therewith the integral pinion 29; and then the interconnecting gear and shaft devices of the speed reduction unit are set into position to interconneet the pinion 29 and the gear 32, The auxiliary frame piece 3i is then set in position on top of the frame piece I2 and locked thereto as by means of bolts II2 (Fig. 1) and then the load brake mechanism is mounted upon the outwardly extending end portion of the shaft 28. Then, subsequent to completion of the wiring connections the cover piece 64 is mounted in position and locked on the assembly by means of bolts H4. Thus, as illustrated and described hereinabove the hoist mechanism is assembled for single reeve operation.

To provide the hoist mechanism so as to be readily convertible to double reeve type, the mating surfaces of the frame pieces I--IZr are provided with matching semi-cyclindridal recesses as indicated at 1--12 (Fig. 3); the recessed portion 12 being topped by a square recess formation 13. Thus, the recess 13 provides accommodation for the square head portion 14 of a load chain anchor bolt 15 (Fig. 5) which engages at its lower threaded portion within a threaded sleeve 16 which in turn connects by means of a pinV 11 with the upper end of the return strand 18 of the load chain 35 after the latter has been trained downwardly and through and upwardly from a lower pulley block 19 carrying the load hook 80. As shown in Figs. 2, 5, the mating surface portions of the frame pieces I-IZ are square-recessed as indicated at 8| to receive therebetween the square outer surface of the threaded sleeve 16, thus holding the sleeve against rotation relative to the frame. This permits the bolt 15 to be rotated relative to the sleeve 15 preliminary to assembly of the device so as to obtain any required vertical adjustment of the sleeve within the frame preliminary to assembly thereof. It will of course be appreciated that incidental to use of the hoist device as a double reeve type, the load center line will thereby shift to a position between theload lift wheel 33 and the load hanger bolt 15, and for that reason the s uspension'h'ook 5I) will then be mounted in the opening 1B in lieu of in the opening 53 which is employed in conjunction with a single reeve type assembly. A press fitting cap device 34 (Fig. 2) is provided to close the upper end of the opening 14 whenever the latter is not in use, thereby keeping foreign material out of the hoist casing.

Figs; 6, 7, 8 illustrate application of the inven- 5 tion to a wire rope type hoist. In this case the hoist frame is generally similar to that of the form of the invention shown in Figs. 1-5; that is, the frame comprises a pair of mating die cast frame parts, one of which is illustrated and designated 90 in Fig. 6. The other frame part is illustrated and designated 9| in Figs. 7 and 8. The hoist frame parts 90, 9| are preferably formed of die cast metal and have meeting rim parts 92 at the central plane of junction between the frame parts when assembled. Bolts 94 are employed to hold the frame parts together, and as explained hereinabove the meeting faces of the frame parts are suitably recessed so as to accommodate the shank portion 95 of a suspension hook device 96; the enlarged lower head portion 91 of the hook being arranged to cooperate with the bearing washer 98 to complete the assembly of the suspension hook to the hoist frame.

As shown in Fig. 6, the hoist includes the usual driving drum 99 upon which winds the wire rope |00, and the load end of the rope is shown as training down and through and upwardly from a sheave block |02 which carries the load lift hook (not shown). The end of the rope |00 is anchored to the hoist frame by means of a swivel headed anchor sleeve |04 which is rigidly xed to the end of the rope and seated upon a counterbored bearing plate |05. The bearing plate |05 is accommodated Within suitably dimensioned key slide recesses |06 formed in the mating surfaces of the frame members 90, 9|, whereby it will be appreciated that the bearing plate |05 may be readily assembled relative to the hoist frame while the hoist frame pieces 90, 9| are being brought together into assembled relation. Then, upon fastening of the bolts 94 the bearing plate |05 is locked in position within the frame for proper support of the anchor sleeve |04.

To permit the anchor sleeve |04 to be readily assembled and/or disassembled from the hoist frame without disassembly of the hoist frame by disconnection of the bolts 94, we provide in the bearing plate |05 a keyhole shaped slot |01 (Fig. 8), whereby it will be seen that the anchor sleeve |04 may be displaced laterally into the enlarged aperture portion of the opening 01 for withdrawal of the end of the wire rope |00 from the hoist frame. However, to prevent unintended displacement of the wire rope end from the hoist frame we provide a screw plug |08 which is inserted in screwthreaded relation within the larger aperture portion of the opening |01 subsequent to assembly of the device. Then, in order to disconnect the end of the rope |00 from the lhoist frame it is only necessary to unscrew the plug |08 and to then pull the anchor sleeve |04 to the right as viewed in Fig. 6, whereupon the end of the rope will come free from the hoist.

Thus, the hoist mechanism of Figs. 6, 7, 8 also employs the principle of paired frame pieces having suitably recessed matching face portions adapted to accommodate the various stress carrying and wear receiving components of the mechanism, whereby the entire hoist structure may be readily assembled by simply slip-fitting the various components into position and then bolting the paired frame members together into nally assembled relation. It will of course be appreciated that whereas only a few forms of the invention have been illustrated and described in detail herein, that various changes may be made therein without departing from the spirit of Vthe invention or the scope of the appended claims.

We claim:

1. A hoist comprising in combination, a pair of main frame members die cast of relatively light weight metal, said main framemembers being of generally cylindrical form and each having an inner end wall portion formed to meet the other at rim portions thereof to provide a plane of junction therebetween, bolt means detachably interconnecting said main frame members, bearing means carried by said end wall portions of said main frame members and mounting therein a load lift wheel, motor means mounted within one of said main frame members and having its rotor shaft in keyed connection with a drive shaft extending through said load lift wheel, speed reduction gear means carried within the other ci said main frame members and having driving connection with said drive shaft, the output portion of said speed reduction gear means being geared to said load lift wheel, said end wall portions of said main frame members being symmetrically recessed and accommodating in clasped relation therebetween at the top portion of said main frame members a suspension hook device and in the region of said load lift wheel a chain guide device and at a side portion of said hoist a chain dead end anchor bolt device.

2. In a hoist, a multi-piece metal frame comprising a pair of main frame members having end wall portions adapted to meet in assembly, detachable connection means maintaining said frame members in assembled relation, said frame end wall portions being recessed to accommodate in clasped relation -therebetween the shank portion of a headed suspension hook, and a bearing washer disposed beneath the head portion of said hook and being generally U-shaped so as to be adapted to slip-nt laterally upon said shank portion of said hook and to thereupon lie between the headed portion of said hook and the meeting portions of said frame members, said washer having a tab portion extending therefrom residing in a recessed portion of one of said frame members thereby preventing rotation of said washer relative to said frame members.

3. In a hoist, a pair of main frame members detachably connected to provide a single main frame assembly, said frame members having opposed end wall portions meeting in abutment upon assembly thereof, said end wall portions being symmetrically recessed to accommodate in clasped relation therebetween the head and shank portion of a bolt device having an end portion extending from said frame assembly for attachment thereto of the dead end portion of the load lift chain of said hoist.

4. A hoist comprising a pair of main frame members detachably connected to provide a unitary main frame structure, said frame members each having an end wall portion abutting the end wall portion of the other frame member when in assembled position, a load wheel mounted for rotation upon said frame end Wall portions, said end wall portions being symmetri-` cally recessed to accommodate in clasped relation therebetween a chain guide device comprising a channel sectioned `wear-resistant metal member embracing said load wheel, said chain guide device having bent tab portions extending in opposite directions and laterally engaging portions of the end wall portions of said frame members for holding said chain guide device in operative position within said frame structure.

aeeaesi 5. In a. noise, a pair of'fraie parts, detachabry ture, said' frame parts having mating end wall,

portions with a Vplurality of matching recesses therein to accommodate therebetween at selec-V tive positions a suspension hook, said end wall portions being also recessed: at a position spaced from the aforesaid recesses to accommodate therebetween the head and shank portion of a dead end suspension anchor device.

7. A hoist device comprising a pair of frame members detachably interconnected to provide a unitary frame structure, said frame members having end wall portions adapted' to meet in` abutting relation uponassembly thereof, said end wall portions being recessed in complementary fashion to clasp in locked relation therebetween a bearing plate, said bearing plate having a keyhole shaped aperture therein, the larger portion of said keyhole shaped aperture being screwthreadedand having mounted in threaded relation therein `a screw plug, the smaller portion of said keyhole shaped aperture being counterbored to receive in bearing relation thereon a =ball shaped' hoist cable anchor member.

8. A hoist device comprisinga pair of frame members detachably interconnected to provide a unitary frame structure, said frame members having end wail portions adapted to meet in' abutting relation upon assembly thereof, said end wall portions being recessed in complementary fashion to clasp therebetween a keystone sectioned bearing plate in locked relation therebetween, said bearing platev having a bearing apertureY therein carrying thereon a ball shaped hoist cable anchormember.

9. In a hoist', a multi-piece metal frame comprising a pair of main frame members having end wall portions adapted' to meet inY assembly, detachable connection means maintaining said frame members in assembled relation, said frame members end` wall portions each being recessed to accommodatein clasped relation therebetween the shank portion of a headedY suspension hook, anda bearing washerdisposed beneath the head portion of said hook and being non-circular in shape and residing in complementarily recessed portions of saidv frame members therebyV preventing rotat-ion of said washer in use.

10; In a hoist, a pair of main frame members detachably connected to provide a single main framefassembly, said frame members having opposed end r wall portions meeting in abutment upon assembly' thereof, saidy endi wall portions being symmetrical-ly recessed toA 'accommodate in claspedrelation therebetween at one position one end of a hoistisuspension device and at another position'onezend of a dead end. anchor device.

f V11'. A hoist comprising a pairY of main frame members detac'zhably` connected to provide a unitary main frame' structure, a loadv wheel mounted for' rotation'. within said frame structure: and. spanningV the: juncture vbetween said frame members, said frame members each havan end wall portion abutting the end wall portionofthe other frame Vmember when in assembled position and said' end wall portions being symmetrically recessed to accommodate in clasped relation therebetween rat one position a hoist suspension device and at another position achain guide device comprising achannel-sectioned wear-resistant metal member embracing said. load wheel.

12.. In a hoist, a multi-piece metal frame com- `prising a pair of main framemembers having end wall portions adaptedV tormeet in assembly, detachable Vconnection means maintaining said frame members in assembled relation,.said frame members having opposed end. wall portions each recessed to accomodate in clasped relation therebetween one end of a headed suspension device when said frame members are in assembled relation, and a substantially U-shaped wear resistant washer device disposed beneath the head portion of said suspension device and being shaped to resist rotation relative to said framemembers.

13. A hoist comprising in combination, a pair of main frame members of metal,L said main frame members being of generally cylindrical form and each having. an inner end wall portion formed to-meet the other at rim portions thereof, means detachably interconnecting said main frame. members, bearing means carried by said main frame lmembers and mounting thereiny a load lift wheel, motor means mounted within oneof said' main frame members and having its rotor shaft in keyed connection with a drive shaft extendingr through said load lift wheel, speed reduction gear means carried within the other of said main frame members and having a drivingl connection with said drive shaft", rthe output portion of said speed reduction gear means being geared to said load lift wheel, said end wall portions of said main frame' members being match-recessed and accommodating in clasped relation therebetween a hoist suspension device.

14. A. hoistv comprising in combination, a pairV of frame members of cast metal, said frame members being` of generally cylindrical form and each having an inner end. wall formed to meet at rim vportions thereof, means detachably interconnecting said frame parts, bearing meansv carriedby said frame members and mounting therein a load lift wheel, motor meansmounted within oneV of said. frame membersv and having its rotor shaftr inv keyed connection with a driveV shaft extending through said load' lift wheel, speed reduction gear means carried' within the other of said' frame members and having driving connection with said drive shaft; the Aoutput portion ofsaid speed reduction gear means being geared to said' load lift wheel, said end wall portions of said frame. members beingA match-recessed'. to accommodate in clasped relation therebetween at diierent positions on said frame members a suspension device and chain guide device and a chain dead end anchor bolt device.

ERFORD E. Rom-Ns. vnoix/rentrer F. PARKER.

References Cited inv thev iile of this patent vUNi'l'ED STA'IES PATENTS Number Name Date 910,798. Duntley .Jan. 26, 1909 1,580,411 Coffmg Apr. 13, 1926 2,246,923. Meunier ,----J une 24, 1941 Parker Apr. I1', 1950

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