US2571572A

US2571572A - Hoist for removing and installing springs on buses, trucks, and the like

Info

Publication number: US2571572A
Application number: US733666A
Authority: US
Inventors: David L Harmon
Original assignee: Individual
Current assignee: Individual
Priority date: 1947-03-10
Filing date: 1947-03-10
Publication date: 1951-10-16
Anticipated expiration: 1968-10-16

Description

2,571,572 was ON Oct. 16, 1951 D. L. HARMON HOIST FOR REMOVING AND INSTALLING SPR BUSES, TRUCKS AND THE LIKE 2 SHEETS-SHEET 1 Filed March 10, 1947 Fig.2.

David L. Harfnon Oct. 16, 1951 D. L. HARMON 2,571,572

HOIST FOR REMOVINGAND INSTALLING SPRINGS ON BUSES, TRUCKS AND THE LIKE 2 SI-IEETS SHEET 2 Filed March 10, 1947 Inventor David L. Harmon 3 II! I' Attorneys Patented Oct. 16, 1951 HOIST FOR REMOVING AND INSTALLING SPRINGS ON BUSES,.TRUCKS, AND THE LIKE David L. Harmon, Indianapolis, Ind.

Application March 10, 1947, Serial No. 733,666

6 Claims.

The present invention relates to new and useful improvements in apparatus for removing and installing heavy duty springs on buses, trucks and other vehicles and has for its primary object to provide an apparatus of this character whereby the springs may be removed and installed in a minimum of time and with a minimum of manual effort required.

The invention is designed particularly for the use in removing and installing semi-elliptical type of springs which are extremely heavy and difficult to remove by manually lifting the same and usually require the services of several mechanics for this purpose. Accordingly it is an object of the present invention to provide an apparatus by means of which the spring may be lifted and removed by a single mechanic and including a truck for transporting the spring to a desired location for repairing the same.

A further object of the invention is to provide an apparatus of this character including a truck for handling the spring and by means of which the spring may be turned into any desired posiion.

A still further object is to provide an apparatus of this character of simple and practical construction, which is efficient and reliable in operation, strong and durable, relatively inexpensive to manufacture and otherwise well adapted for purposes for which the same is intended.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout and in which:

Figure 1 is a side elevational view.

Figure 2 is a top plan view.

Figure 3 is a longitudinal sectional view taken substantially on the line 3-3 of Figure 2.

Figure 4 is a front elevational view, and

Figure 5 is an enlarged sectional view taken on a line 5-5 of Figure 1.

Referring now to the drawings in detail wherein for the purpose of illustration I have disclosed a preferred embodiment of the invention the numeral '5 designates a portable stand which includes a pair of longitudinal spaced parallel frame members 6 converging at their rear ends as shown at l for attaching to a platform 8 at the rear end of the stand. A pair of caster or swivelly mounted wheels 9 support the platform 8 at the side edges thereof and similar wheels I0 support the front ends of the frame members 6. A transverse brace ll connects the frame memher 6 intermediate the ends thereof and a transverse brace 12 also extends between the converg ing ends I of the frame members.

A mast I3 is pivotally mounted at its lower end for vertical swinging movement on a transverse pin 14 supported at the rear end of the frame member I and a jack I5 preferably of a conventional hydraulic type and including a cylinder I6 is pivoted at its lower end for vertical swinging movement on a transverse pin l1 carried by the brace l2. A piston I8 is mounted for working in the cylinder and from which a piston rod l9 extends upwardly through the top of the cylinder and is pivotally connected to a pair of spaced parallel ears 20 by means of a pin 2 I.

'A boom 22 projects forwardly of the upper end of the mast l3 and includes a hollow inner end 23 fixed to the upper end of the mast and 'an outer end 24 rotatably connected to the inner end 23 by a connector 25 having its ends inserted respectively in the adjacent ends of the inner and

outer sections

23 and 24 of the boom. The connector is secured to the outer section '24 by bolts or the like 26 and is free in the inner section 23.

A worm gear 21 surrounds the connector 25 and suitably secured thereto and with which a worm 28 is operatively engaged for operation by a crank handle 29. The worm is journaled in brackets 30 suitably secured to the inner section 23 of the boom.

A head 3| is carried at the outer end of the boom 22 and includes a transverse plate 32 having a pair of rearwardly projecting spaced parallelarms 33 with a pulley wheel 34 positioned therebetween and suitably secured thereto. Trunnions 35 project outwardly from the sides of the arms 33 for pivotally mounting the head in the outer end of the boom 22 for vertical swinging movement of the head.

A cable or chain 36 has its front end trained over the pulley 34 and is secured to the underside of the pulley, the cable extending rearwardly of the boom 22 and under a pulley 31 and secured thereto as shown at 38. The pulley 31 is journaled to the boom 22 by trunnions 39 and the ends or flanges 43 of the pulley project rearwardly and provided with a pin 4! to which the upper ends of a jack 42 is pivotally connected and constructed similar to the jack l5. The lower end of the jack is pivoted on a pin 43 carried by a bracket 44 secured to the underside of the boom 22.

A transversely extending plate 45 is pivoted at the front surface of the plate 32 of the head by means of a centrally disposed bolt or the like 46.

A pair of L-shaped hooks 41 have their upper ends removably positioned in vertical slots 48 in the plate 45 and are secured in position thereto by laterally extending pins 49 extending through aligned openings 50 and 5| formed respectively in the edges of the plate 50 and in the upper portion of the hooks 41.

A pair .of angular clamping members ,52 .have their inner ends adjustably secured in vertically extending slots 53 formed in the plate 45 and project forwardly of the plate in overlapping relation with respect to the hooks 41.

In the operation of the device the stand is rolled into position at the side of the vehicle from which a spring is to be removed and after the bolts holding the spring to the vehicle have been removed the spring is clamped on the arms 41 by the clamps 52.

By operating the jack 42 the cable 36 is wound on the rear pulley 31 and which in turn rotates the front pulley 34 to swing the head 3| vertically to raise the spring and the boom 22 may also be raised by operating -*the jack l5 tc-swing :the mast (Grearwardly.

.i ilso if desiredthespring may be -rotated=on a :horizontal axis *by rotating the outer section "24 of theboom in *the inner-section 23 thereof through the operation-of the'handle 29 and'gears Hand 28. The spring may thus be turned in aIlesire'd. position for conveniently repairing *the spring and the stand may also bemoved toa desired location to perform necessary repair work ;on the sprin without'requiring the manual lift- "ingor'handling thereof.

I claim:

'1. A portable'hoist 'of 'the class described in- .itsiaxisatthe upper end of .the-mas't and ,pro-

jecting horizontally therefrom, work clamping ,means pivoted at the outer end of the .boom for vertical swinging .movement, individual adjusting means for .the mast and work clamping :membenand mechanism .for roitatably adjusting theboom.

.3. Aporta'blelhoist of the class described com- ,prisinga frame, amastpivoted to itheframe' for vertical swinging movement, a boom rotatably carried at the upper end of the mast and projecting horizontally therefrom, work clamping means pivoted at the outer end of the boom for vertical swinging movement, mechanism for swingably adjusting the mast on its pivot, and pulley and cable winding means connected to the work clamping .means .to swingably adjust the latter on its pivot.

4. A portable hoist of the class described comprising a frame, a mast pivoted to the frame for vertical swinging movement, a boom rotatably carried at the upper end of the mast and pro- :jecting horizontally therefrom, work clamping means pivoted at the outer end of the boom for vertical swinging movement, mechanism for swingably adjusting the mast on its pivot, a pulley r-journaled :onithe boom, a jack device connected to the pulley to rotate the latter, and a cable windable on the .pulley and connected to the work clamping member to swing the latter on its pivot.

5. Aportable'hoist-of the-class describedcomprising aframe, amast-pivoted to the frame for vertical swinging movement, a boom rotatable on 'itsaxis at the upper end of the mast and-projecting "horizontally therefrom, a work clamping means pivoted at the outer end of the boom'for vertical swinging movement, mechanism for *swingably adjusting the maston its pivot, mechanism for rotatably adjusting the boom, and mechanism for swingably adjusting the work supporting member on its pivot.

6. Apertablehoist of the class described comprisingaframe, a'mastpivoted'to the frame for vertical swinging movement, a boom .rotatably carried at the upper end of the mast and projecting horizontally therefrom, a work supporting 'head'pivoted'to the outer .end .of theboomzfor vertical swinging movement, and a Work clamping :member pivoted to the .head for vertical swinging movement on 'an axis at right angles tothe axis of the head.

DAVID L. HARMON.

REFERENCES CITED The followingreferences are of record in the file .ofthis patent:

UNITED 'iSTATES PATENTS Number Name Date 306,721 Cope Oct. 21, 1884 998,469 Craig July 18, 1911 1,489,161 Schuchert Apr. 1, 1924 118843361 'Remde Oct. 25, 1932 2,3'18'5310 Heintz May '4, .1943

2,418,251 Drott .Apr. 1, .1947