US2527097A - Hoist - Google Patents

Description

Oct. 24, 1950 Filed May 27, 1946 M. S. KATOW HOIST 6 Sheets-Sheet l M. S. KATOW Oct. 24, 1950 HOIST Filed May 27, 1946 6 Sheets-Sheet 2 4, #mm2-v M. S. KATOW Oct. 24, 1950 es Smets-sheet s HOIST Filed Hay ,27 '-1946 Ott. 24, 1950 M s, KATow 2,527,097

HQIST Filed May 27. 1946 6 Sheets-Sheet 4 M. S. KATOW Oct. 24, 1950 HOIST 6 Sheets-Sheet 5 Filed )lay 27, 1946 M. S. KATOW Oct. 24, 1950 HOIST 6 Sheets-Sheet 6 Filed may 27, 194e hn-Fig. 2.is a top elevation of the hoist vtion whichv it takes when the aerating unit is lifted from the tank, a portion of the associated :pipe structure being omitted to show a detail oi Patented Oct. 24, 1950 Masa-kam Sz. Katow, Chicago; Ill.,` assignor to Chicago Pump Company, a corporation of Dela- War? Applicationlvlay 27, 1946, Serial No. 672,414

f This invention relates to-a mobile hoist particuflarly'adapted to lift apparatus out of a tank or similar structure. i

,.--AAlthough many ofthe structural characteris- -tics of :thehoist of the-present invention are advantageous in. generalfusage, the hoist is especiallyadvantageous for the removal of air dif- VAfusing-unitsfrom a sewage treating tank. YThis hoist will be described, merely by way of example,, in connection Jwith a sewage treating appa- -ratus such as is described` and claimed in the z.patent^"tol' fannert, No. 2,328,655, granted September 7,1943. .I f

In I sewage treatingV systems which employ aerating apparatus such as is `disclosed in the i aforementioned Lannert patent, a'multiplicity oi" -tanks is provided with aerating apparatus suspended in each tank for supplying predetermined yquantities of air to the sewage content of the tank. The r.hoist of Vther-present invention is particularly designed to lifft the Lannert and other aerating apparatus ofthe so-called lswingi type Aoutof the tanks for inspection, repair or replacement. l

Mobile hoists have :been used for this type of vWork in the past,` but they have not been entirely -satisfactoryibecause ofthe manpower required to -move the hoist into .position onthe' catwalks between adjacent tanksVand because of the inability tosatisfactorily anchor the-hoist to the `rcatwalk. v,Iv have designed novel means for anchoring each end of. thehoistto stationary an- `zchoring means-.provided adjacent the .tanks-so that the hoist may perform its intended'iunc- .f-tionwithout being made excessively cumbersome or heavy. :Y The ,hoist mayybe. moved readily on :thegcatwalk to any desired location and then Amanipulated into proper position by a single operator.

The` manipulation of previouslyknown hoists yperforming the samel work required the efforts of three men. Once in the desiredposition, the hoist is operated to lift the aerating apparatus from the tanks. Itmay be operated Aand the structure onthecatwalk 'to which itis f isacrossisectional view taken along the line 3--3 ofV Fig. v2, the dotted .line position showing the position ofthe parts of the hoist when rthe aerating unit is in position within the tank, a'sinligl;` i 1A f' 'i Fig. 4 is a perspective viewl ofthe hoist;

' Fig. 5 is affragmentary perspectiveview 'show- .ing the rear portion of the chassis with the hydraulic motor removed;

Fig. 6 is fa perspective-'view:ofsthelift arm anchored, with parts terior thereof;

Fig.'.7fis afront .elevation 'ofthe hoist, the dotted lines `showing the position ofv thepartsas sectioned to show the invthe hoist is about to be engaged with the anchoring structure; f

Fig. 8` is across sectional view taken along the line 8-8 of Fig.l 7 and;

manually, or it may beoperated by any conventional air, electric or hydraulic motor, or by other means, as desired.;A

lReferring now to the drawings: w. v Y v Figure 1 is a perspective-view showingfthe hoist -in position on a catwalk to lift an aerating unit out of a tank;

in the posithe said structure.

Fig. l9 is a crosssectional View, partly broken away; alongtheline 9-9 of Fig; 2.

. In .the drawingsftherelis shown a pair of sewage tanks I0 andk II having a'common partitionwall, suitably Aof@ concrete, the top portion of which'takes' the form cfa-Y having diverging branches' I2 and I3 overhangingr the edges fof adjacent tanksv I0 and II. V'tions` I4 and" I5 are securedV to the branches I2 'Vertical top secand .I3byfanchor bars I6 and Il embedded in the concrete. A main air supply pipe IB is'supported in' any conventional manner in the space stood-that any desired number of pairs of tanks may befprovided and a single hoist may be moved from one pair of tanks t0 another,l as needed.

An' elbow 20 is swiveled toa stationary hollow head 2 I, as indicated at 22, Fig. 2. The'air moves from the supply pipe I8 through a feeder line 23 (Fig. 3) to the hollow head 2| and through the elbow 20 to a pipe section 24 which is tted at one end to the elbow 2U and at its other end to arswivel joint, a pipe section and a depending diffuser unit (not shown), as in the Lannert patent. The head 2l is provided with an integral flange 25 which is secured to a similarilange 25 on the end of the" feeder line 23 by means of bolts 21, a's'shown in Figs.r 2 and 6. The stationary -head 2l is provided with an integral lug 23 prohas a triangular area with its apex at the juncture of the lug 28 with the head 2 I.

The chassis of the hoist comprises a pair of longitudinal metal bars 3U and 3| joined in any conventional manner by a plurality of cross bars 32. The bars 30, 3| and 32 may be of any desired shape, but tubular bars are preferred because of the saving in weight. A fiat plate 33 is permanently secured at one end of the chassis and is provided with apertures 34 (Fig. 5) so that a suitable pump 35 may be mounted on the plate 33 by means of bolts 36. The pump is shown diagrammatically in Fig. 4, but is omitted from the other figures for the sake of clarity. The pump may be operated manually or by any suitable type of motor (not shown).

The chassis is supported on three casters 31, 38 and 39, as seen in Figures 4 and 'l The caster 31 is rotatably mounted in a bracket 40 having a stem 4| projecting into a tubular casing 42. The casing 42 is supported by a bracket 43 extending angularly from the chassis bar 38. The casing 42 contains a coiled spring 44 confined between a movable washer 45 and a xed washer 46. Both washers 45 and 46 are apertured and the stem 4| is reduced in thickness, as indicated at 41, to pass through the apertures with the shoulder of the stem 4| in contact with the lower surface of the washer 45. The upper end of the stem 41 has a pin 48 passing therethrough to prevent disengagement of the stem from the upper washer 46. The caster 31 is free to move in any direction.

The caster 38 is mounted in a manner similar to caster 31 except that in the case of caster 38 the stem 49 has a pin 15D projecting therefrom and fitting in a slot extending longitudinally in the tubular casing 52 so as to fix the caster 38 against any swiveling action (see Fig. 5). The casing 52 is supported by a bracket 52 extending angularly from the rear end cross bar 32.

The caster 39 is rotatably mounted in a bracket 53 having a stem 54 projecting into a tubular casing 55 supported by the bracket 56 extending from the chassis bar 3|. The stem 54 is reduced in thickness, as indicated at 51, Fig. l7, so as to permit it to pass through an aperture in a movable washer 58 in the bottom of the casing 55 with the shoulder of the stem abutting the washer 58. A coiled spring 59 encircling the reduced portion 51 of the stem 54 is confined in the casing 55 between washer 58 and xed washer 58. The top end of the casing 55 is substantially covered by an arm 60. The reduced portion 51 of the stem 54 projects into an aperture in the arm 60 and is fixed thereto by means of a pin 6|.

The arm 60 extends on one side of the tubular casing 55 and is pivoted at its end to the end of a handle 62, as indicated at 63.

The handle 62 comprises a bar 54 having a cross bar 65 at one end and a bifurcated bracket 65 at its other end pivoted to the arm 60. The sides of the bracket 66 straddle the arm 60 and the bottoms of the said sides contact the top of the tubular casing 55. The pin 6| fixes the stem 54 and the caster 39 relative to the arm 68 so that the caster 39 can swivel only as the handle 62 is turned relative to the tubular casing 55.

This arrangement of one freely swiveled caster 31, one fixed caster 38, and the caster 39 swiveling only with the handle 62 enables the operator to maneuver the chassis of the hoist readily by rotation about the intersecting point of the extending centerlines of the xed caster 38 and the caster 39 by swinging the handle 62 around the cylindri- 4 cal casing 55 and pushing or pulling on the cross bar 65.

Referring particularly to Fig. 7, it will be seen that downward pressure on the handle 62 will force the tubular casing 55 downwardly against the action of the coiled spring 59, as indicated by the dotted lines. Since the tubular casing 55 is rigid with the chassis bar 3|, such downward movement will cause that side of the chassis to be tilted downwardly to the dotted line position. This tilting of the left hand side of the chassis, as seen in Fig. 7, causes a slight lifting movement of the right hand side of the chassis for a purpose to be hereinafter described.

The chassis bar 30 is provided at the rear end with an anchoring hook 61 and at the other end with a positioning hook 68 (Figs. 4 and 5). The hook 61 has a horizontal flange 69 and a pair of vertical wings 10 and 1|. When the hoist is properly positioned for operation, the flange 69 is positioned under the lug 28 integral with the head 2| opposite the air diffusing unit which is to be lifted by the hoist. The hook 68 comprises a pair of outwardly projecting, converging flanges 12 and 13 (Fig. '7). When the hoist is finally positioned for operation the hook 68 will be engaged with the flanges 12 and 13 on opposite sides of the vertical web 29 on top of the lug 28 integral with the stationary portion of the' unit to be lifted.

The hoist comprises ahydraulic ram 14 pivotally mounted on one of the cross bars 32 of the chassis, as indicated at 15. The other end of the hydraulic ram is pivotally secured to a tension link 16, as indicated at 11. The bottom end of the tension link 16 is pivotally mounted, as indicated at 18, on a cross bar 32 spaced from the cross bar on which the hydraulic ram is mounted so that the ram and tension link form a triangle with the chassis as a base in the rest position of the hoist, as in Fig. 4, and in the operative position at the beginning of its work to remove an air diffusing unit, as in Fig. 1. A hose 19 (Fig. 4) leads from the pump 35 to the ram 14. Fluid forced through the hose by the pump causes the ram to expand and this expansion forces the tension link to move around its pivot point 18. When the pump is stopped and the weight (of the air diffusing unit) pulling on the tension link causes the ram to contract, the uid flows through the hose 19 in the opposite direction back into the reservoir of the pump. The tension link has a spring 8| secured thereto, as indicated at 82, Fig. 3, with its other end secured to the chassis, as indicated at 83, for a purpose to be hereinafter described.

A cable 84 has one end secured to the free end of the tension link, as indicated at 85, and has its other end secured to a lifting arm 86 (Figs. 4, 6 and 8), as indicated at 81. The lifting arm comprises an angular plate 88 mounted for rotation on one end of the chassis by means of a bearing 89, shaft assembly 90 and bearing 9|. The shaft assembly 90 carries interiorly thereof a pin 92 which projects outwardly for a purpose hereinafter described. The bearing 9| is positioned about the shaft assembly 90 and these elements are enclosed by a housing 93 and an end plate 94. The lifting arm 86 has one end bent at right angles, as indicated at 95, and this end is recessed, as at 96 (Fig. 4), to receive the pipe section 24.

Referring particularly to Figs. 6 and 7, the method of preparing the hoist for operation will be described. The elbow 20 which is swiveled to the Stationary head 2| is secured in place by a Mtoit s1 journau'ed in a' 'bearing' as and threaded l `into an' aperture inthe elbow 20,*as indicated at tion"between"the head'l 2l andthe elbow 20 to permitswiveling 'action' therebetween. The el- "bow 2li-lis recessedasindicated at 'm3, in line with. the bolt 91,' to"rec'eive'the"end of the pin' 92.

` When thehoist `chassis is positioned' between twov oppositeA 'pipe systems with the `fiange E9 under one lug 23, the chassis is maneuvered by means of the handle 62 until the hook 68 is adjacent the opposite lug 28 and the pin 92 is partially entered in the recess |03. Depression of the handle 62 and the resulting tilting action about the end of pin 92 causes the hook 68 to rise slightly. While the handle is still depressed and the hoist is still tilted, the chassis is pushed towards elbow 2G. This pushes hook 38 over the vertical web 29 so that the sloping flanges 12 and 13 straddle the web, and the pin 92 is pushed into the recess W3 as far as it can go. Pressure on the handle is now released and this causes the chassis to level off and lock the hook 68 to lug 28.

Starting from the position of the hoist illustrated in Fig. 1, and in dotted lines in Fig. 3, uid is forced into the hydraulic ram Ill by a pump (shown conventionally at 35, Fig. 4) operated by hand or by any suitable type of motor, and the ram is expanded. The expansion of the ram forces the tension link T6 to move on its pivot thereby exerting a pull on the cable 34. This motion continues until the apparatus reaches the position illustrated in Fig. 3. As shown in solid lines in Fig. 3, the lifting arm 86 has been rotated 180 degrees and the pipe 24 is extending vertically upwards. Since the aerating apparatus is constructed as shown in Fig. 1 of the patent to Lannert No. 2,328,655, the diffuser unit will then be accessible for inspection, repair or replacement by a person on the catwalk. When the fluid is allowed to flow from the ram back to the pump reservoir the force of the spring 8l is sufcient to start the reverse rotation of tension link 16 and the contraction of the ram. The weight of the pipe 24 will carry it back to its position shown in Fig. 1.

Although I have described a preferred embodiment of my invention in considerable detail in connection with the air diffusing unit of the aforementioned Lannert patent, it will be understood that the description is illustrative, rather than restrictive, as many details of structure may be modified or changed, without departing from the spirit or scope of the invention, and other aerating units or other devices may be lifted with the hoist of my invention. Thus, for example, caster 38 may be duplicated to provide two or more casters with the axis of the wheels along the same line, and freely movable caster 31 may be duplicated anywhere on the chassis. The minimum required number of casters are three, as described in connection with the preferred embodiment. Also, it is manifest that hook 58 may be mechanically locked directly to lug 28 without being interlocked with web 29, as

described, thereby eliminating the need to tilt the chassis. Accordingly, I do not desire to be restrictedto the exact details of structure described, except as limited by the appended claims.

I claim: 1. A hoist comprising a chassis having three supporting casters, said hoist being adapted to kkbe'witli a'pairl :oft Yiixed lugs," one :of

fthe length of Lsaid chassis, a hook on said chassis bengageable with said second lug, and means for rocking said chassis vertically about a line Vexftending between two of saidcasters to facilitate 'Y engagement of said chassis vwithsaid rst mentioned lug. Y y

2. A hoist comprising a chassis having'three supporting casters arranged in triangular re- 'lfationship, which is adap'ted'vto be used'y with a pair vof fixed lugsspaced apart a distance substantially equal tothe length of said hoist, means on one end of said hoist engageable with the underside of one of said lugs, means on the other end of said hoist normally spaced slightly below the upper portion of said other lug, and means for tilting said chassis to engage said second mentioned means with the upper portion of said second mentioned lug.

3. A hoist comprising a chassis having three supporting casters arranged in triangular relationship, which is adapted to be used with a pair of xed lugs spaced apart a distance substantially equal to the length of said hoist, each of said lugs having a horizontal flange and a Vertical web extending above said flange, a hook on one end of said chassis engageable with the underside of said flange on one of said lugs, another hook on the opposite end of said chassis having a pair of sloping anges engageable with the vertical web on the opposite lug, said second mentioned hook being normally spaced too low to pass over said vertical web, and means to tilt said chassis to permit said second mentioned hook to pass over said vertical web to facilitate engagement and disengagement of said sloping flanges and said vertical web.

4. A hoist comprising a chassis, three tubular members secured to said chassis in triangular relationship, a coiled spring encased in each of said tubular members, three casters each having a stem projecting into one of said tubular members, a horizontal arm extending from one of said tubular members, and a handle pivoted to said horizontal arm and engageable with the top of the adjacent tubular member to depress it and tilt said chassis against the action of the spring encased in said tubular member.

5. A hoist comprising a chassis having three supporting casters arranged in triangular relationship, means adjacent one of said casters for tilting said chassis around a line between said other two casters to facilitate engagement of said chassis with supporting means separate from said hoist, a link pivoted at one end to said chassis, said link having a cable secured thereto, an expanding ram pivoted at one end to said chassis and at the other end to said link and means to expand and contract said ram to move said link about its pivot.

6. A hoist comprising a chassis having three supporting casters, a hook on said chassis, a lifting arm on said chassis having a pin projecting therefrom, said hook contacting a xed support when said pin is partially engaged with an object to be moved thereby preventing further movement of the chassis in that direction in normal position, and means adjacent one of said casters for tilting said chassis vertically about a line extending between said other tWo casters to permit said hook to ride over said fixed support and t0 permit complete engagement of said pin with said object to be moved.

'7. A hoist comprising a chassis mounted on casters, each of said casters having a stem projecting into a spring encased in a tubular member mounted on said chassis, a lifting arm pivoted on said chassis and having a projecting pin engageable with a movable object which is to be lifted. said pin being normally out of alignment wlth its proper holding position, thereby preventing full engagement of said pin with said movable object, and means cooperating with one of said tubular members for rocking said chassis to permit full engagement of said pin with said movable object.

MASAKAZU S. KA'I'OW.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS

Images