US1287966A - Lifting-jack. - Google Patents

Description

F. L. GORMLEY.

LIFTING JACK.

APPLICATION FILED FEB. 21. 1918.

l ,287,966., Patented Dec. 17, 191 8.

2 SHEETS-SHEET 2.

65 %ML Gormley,

FRANK L. GORMLEY, OF BROOKLINE, MASSACHUSETTS.

LIFTING-JACK.

matese.

Specification of Letters Patent.

Patented Dec. '17, 1918.

Application filed February 21, 1918. Serial No. 218303.

To all 'whom z't may concm:

Be it known that I, FRANK L. GORMLEY,-

The invention consists in providing the Operating gear spindle with locking means 'which will permt the gearto be rotated in one direction to raise the movable member but will prevent accidental rotation of sad gear in the reverse direction, said' looking member having associated therewith a man-;

uallyoperated lever for controlling the action 'of said looking means.

The invention further consists of certain novel features of construction and arrangement of parts which will be more fully un derstood by reference to the description of the drawings and to the claims to be hereinafter given.

For the purpose of illustrating the invention one preferred form thereof is illustrated in the drawings, this form having been found to give satisfactory and reliable results, although it is to be understood that,

the various instrumentalities of which the inventon consists can be varously arranged and organized and that the nventon is not limited to the precise arraigement and organization of these instrumntalities as herein shown and described, except as required bv the sco e of the appended claims.

Of the raw'ings:

Figure 1 represents a horizontal section of a lifting jack embodying the features of the present invention, the cutting plane being on line 1, 1 o'n Fig. 2.

Fg. 2 represents a vertical section of the same, on line 2, .2 oi Fig. 1.

Fi'g. 3 represents a vertical section on lne 3, 3 on Fig. 2, drawn to an enlarged scale, and

Fig. 4 represents a horizontal section on line 4, 4 on Fig. 2.

Similar reference characters desi'gnate like parts throughout the several figures of the drawings.

In the drawings, 10 represents a suitable base supporting a stationary standard 11, over the outer periphery of which is fitted a movable sleeve' 12, to the upper end of which is threaded a cap 13.

In the upper end of the standard 11 is mounted a 'nut 14 to which is threaded a lifting screw'l having splned to its upper reduced end a bevel gear 16 with which meshes a bevel gear 17 formed upon or secured to a revoluble shaft or spindle 18, the outer endof which is provided with a ,suitable Operating' mechanism 19 -of any well known Construction.

Between the upper face of the bevel gear 16 and the inner face of the cap 13 are two v annular plates 20, 21, between which are interposed a plurality of` anti-friction members 22.

The movable member 12 is provided on oneside with a flanged projection 24 having a removable plate 25 secured thereto by bolts 26.

The plate 25 is provided with a bearing 27 for the spindle 18, and keyed to said spindle 18 between said inner end of said bearing 27 and the rear face of the bevel gear 17 is a worm gear 28 rotatable in either direction with the bevel gear 17.

The worm gear 28 meshes with a worm 29 formed upon or secured to a shaft 30 revolubly mounted in ears 31, 32 projecting inwardly from the plate 25.

On one end of the shaft 30 and adjacent to the ear 32 are two collars 33, 34between which are interposed a plurality of antifriction members 35, said collars 33, 34 being retai'ned together by a rng 36 secured to the collar 33 and havng an annular flarge 37 extendingover the outer face of the collar 34. The collars 33, 34: with the anti-frictionmembers 35 form a thrust bearing for the shaft 30 on which the sad thrst hearing is retained by a nut 38 threaded to the reduced end 39 of said shaft.

Loosely mounted on the opposite end of the shaft 30 is a spur gear 40 having a ta pered annular fiange 41 with which coacts a disk 42 keyed to the shaft 30 and having a cone-shaped periphery adapted to contact with the tapered 'fiange 41 of the gear 40.

The disk 42 is retained upon the reduced end 43 of the shaft 30 by means of the ntt 44 threaded to said reduced end. When the movable member 12 is being raised the worm gear will be rotated in the direction of the arrow a on Fig. 3 of the drawings and the disk 42 will be separated from the ange 41 and no rotation will be imparted to the spur gear 40.

When a load is on the cap 13 tending to lower the member 12 the tendency would be to rotate the worm gear 28 in a direction opposite to that indicated by the arrow a and the worm shaft 30 would be moved endwise, toward the right of Fig. 3, until the cone-shaped periphery of the disk 42 has been brought into' firm contact with the tapered ange 41 on the gear 40.

t is obvious that under these conditions any rotary movement imparted to the shaft 30 will be imparted to said gear and through it to the pinion 45 with which its teeth are constantly in mesh.

The pinion 45 is forned upon or Secured to one end of a short shaft 46 revolubly mounted in a hearing 47 formed upon the plate 25, said shaft 46 being provided at its end with a reduced portion 48 to which is keyed a brake disk 49 having a cone-shaped periphery.

The plate 25 .is provided with another hearing 50 in axial alinement with the bearing 47 and in this hearing 50 is slidably mounted the shank 51 of a disk 52 having a fiange 53 the inner wall of which is tapered to fit the cone-shaped periphery of the disk 49.

he iange 53 of the disk 52 is normally held in contact with the periphery of the disk 49 by means of the spring 54 and said disk 52 is prevented froni rotating by means of thepins 55 eXtending therefrom into openings 56 in a ange 57 forming a part of the hearing 50.

lChis hearing 50 is provided with two diametrically disposed Slots 59 in its periphery and in these slots 59 are positioned the cylindrical hubs 60 of a bifurcated lever 61 having cam surtaces 62 hearing againstthe inner face of the collar 58.

The lever 61 is provided with an arm 63 projecting through an opening 64 in the plate 25 the outer end of which is accessible to the operator who may with his fingers move the arm 63 in the direction of the arrow 5 and thus disengage the brake members 49, 53 and thereby permit the member 12 to be lowered.

As long as these brake members 49, 53 are in contact the worm 29 will be prevented :trom rotating and as a consequence, there can be no downward movement of the member 12,

The rapidity of the lowering of the member 12 may be controlled readiiy by the movement oi' the iever 61. i

The pitch of the threads of the 29' is naeaeeesuch that said worm may be rotated by the rotation of the worm gear 28.

'in the operation of the jack the worm gear 28 is revolved in the direction of the arrow a when raisin movement e? said gear 28 it will through the slight end movement imparted to the worm 29 disengage the members 41, 42 so that there will be no brake devices or friction to re tard the rotation of the gear 28.

`When, under the load, the gear 28 begins to rotate in the opposte direction, the worm 29 will be moved endwise until the members 41, 42 are engaged and then rotary movement will be imparted from the shaft 30 to the short shaft 46 through the gears 40-45 At this time the brake members 49, 53 will be disengaged, said disengagement having been efi ected by the lever 61.

When, on account of an excessive load upon the ca-p 13, the member 12 moves downwardly too rapidly, its movement may be arrested by simply moving the lever 61 to bring the members 49- 5?) into frictional contact.

This makes a very simple mechanism for controlling the lowering of the jack and it is believed that its operation and the many advantages of the invention will be readiiy understood without further description.

One advantage of the present invention is that it dispenses with the use of all pawls and ratchets which are ordinarily used in jacks or" this character.

Having thus described my claim: V a

1. 'Jin a lifting jack, the combination of a revoluble Operating shatt; a worm gear secured on said shaft and positively rotated thereby in either direction; a worm meshing therewith and adapted to be rotated thereby: and means for retarding the rotary movement of said worm 'and varying the speed ot rotation thereof.

2. tn a lifting jack, the combination ot" a revoluble Operating shatt: a worm gear keyed to said Operating shaft and positively rotated thereby in either direction; a worm meshing therewith and adapted to be rotated thereby; a brake mechanism; means actuated by the rotation of said worm for piacing said brake in action during the lowering operation; and means for controlling the operation of said breke mechanism.

3. In a litting jack, the combination of a revoluble Operating shatt: a worm gear keyed thereto and positively rotated thereby in either direction: a worm meshing therewith and adapted to be rotated thereby: a brake mechanism; means actuated by the rotation of said worm for placingsaid brake in action during the iowering operation; and manualiy actuated means for controlling the operation of said breke mechanism.

e in ii'ting jack,

the load and' at the initialinvention, l

the combination ot' a revoluble Operating shaft; a worm gear keyed thereto and positively rotated thereby in either direction; a worm meshing I therewith and adapted to be rotatecl thereby .ing operation and thcreby actu'ate said brake mechanism; and means for controlling the operation of said brake mechanism'.

5. In a lifting jack, the combination of a revoluble Operating shaft; a worm gear keyed to said- Operating shaft and positively rotated thereby in either direction; a worm meshing therewith 'and adapted to berotated thereby; a brake mecha'nism; means. includinga rotatable member ada ted to be placed in action by said worm durng the lowering operation and thereby actuate said breke mechanism; and a cam member :for controllng the operaton of sad brake mechan'sm;

6. In a lift-,ing jack, the combination of a revoluble Operating shaft; a worm gear keyed to said Operating shaft and positivel rotated'thereby in either direction; a -sli able x worm. meshing therewith and adapted to be rotated thereby; abrake mechanism independent of the slidable worm but actuated by the rotation thereof; means actuated by the sliding movement of said worm for placing said 'brake in action duringthelowering operation; and means for controlling the operation 'of said brake mechanism.

7. In a liftng jackthe combination of a.

revoluble Operating s aft member; a movable member thereon; a revoluble member for raising said movable member; means for rotating said revolub'le memberincluding a laterally extendin' Operating shat; a worm gear keyed to sai Operating shaft; a worm meshing with and adapted to beretated by said worm gear and'having end movement; a gear loosely mounted on the worm shaft; a member Secured to said shaft adapted to be moved with said shaft into driving engagement with said gear; a rotatable brake member; a driving pihion therefor 'meshing with said gear; and a non-revoluble brake member coacting 'withsaid rotatable brake member.

8. In a lifting ack, the combination of a revoluble Operating shelf; a worm gear keyed to said Operating shaft;-aworm meshing with and adapted' to be rotated by said worm gear and having end movement; a

gear loosely mounted on the worm shaft; a

member Secured to said shaft adapted to be moved with said shaft into driving engagement with said gear; a rotatable breke member; a driving pinon therefor meshing with said gear;`a non-revoiuble breke memv revoluble Operating shat; a worm gear revoluble Operating shaft; a 'worm keyed thereto and positively rotated thereber coacting with said rotatable breke member; a spring for normally retaieing said brake members in engagement; and manually actuated means for disengaging said members.

9. In a liftng jack, the combination of a -evoluble .Operating shaft; a worm gear keyed to said Operating shaft; a worm meshing with and adapted to be rotated 'by ,said worm gear and having end movement;

10. In a lifting jack, the combination of a 35 keyed thereto and positively rotated thereby in either direction; a slidable and rotatable worm meshing with said worm gear;

a breke mechanism independent of but adapted to be actuated by the rotaton ef 'said worm; and means for placing said brake meehanism in and out of action by the sliding movement of said worm in opposite directions.

' 11. In a liftin'g jack, the combination of a gear by in either direction; a slidable and rotatable worm meshing with said worm gear; a brake mechanism independent of but adapted to be actuated bythe rotation of said worm; means for placing said breke meeha'- nism in and out of action by the sliding movement of said worm in opposite directions; and manually operated means for regulating said breke meehanism when 'in action.

12. z a lifting jack, the eombination ofa revoluble Operating shaft'; a worm 'gear keyed'thereto and positiveiyr otated therene by in either direction; a shdable and rotatable worm meshing with said worm gear; a breke disk; means for rotating Saiti disk by the ,rotation of said. worm during the v lowering of the load; and' e non-revolible member underthe control of the operator adapted .to ceaet with said ;disk to prevent the oad being lowered too rapidly.

Signedby me at 4 Post Ooe Square, Beston, Mase., this 20th day of FRA L. GORMLEY; Witne es:

Februarv. 1918.

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