US1355842A

US1355842A - Lifting-jack

Info

Publication number: US1355842A
Application number: US256496A
Authority: US
Inventors: Neal Albert
Original assignee: Individual
Current assignee: Individual
Priority date: 1918-10-02
Filing date: 1918-10-02
Publication date: 1920-10-19
Anticipated expiration: 1937-10-19

Description

A.- NEAL. LIFTING JACK. APPLICATION FILED 0 01'. 2, I9I 8.

1,355,842. Patented Oct 19,1920.

YII'IIIIIIIIIIIIIIII/l ll llul Q I uvrz/vro '2 A TTOP/VIY- OFFICE.

ALBERT NEAL, OF KOKOMO, INDIANA.

LIFTING-JACK.

Application filed October 2, 1918.

To 015 whom it may concern:

it known that I, ALBERT NEAL, a citi- Zen .of the United States, residing at Ko-' komo,,in the county of Howard and State of Indiana, have invented certain new and useful Improvements in Lifting-Jacks, of which the following is a specification.

A demand has arisen for a lifting-jack by which a wheel of a motor car caneasily be raised a distance so that the face at the tire will clear the ground, and by which the load can be instantly dropped by reason of the cushioning eifect afi'orded by the pneumatic character of the tire, so that fit the tedious operation of gradually letting the car dOWn is obviated.

The present invention relates to the above class of lifting-jacks, and one of the objects of the invention consists in the provisiofi of a lifting jack of the above character by which a motor car, or similar load, can be easily and quickly raised the desired height and at the conclusion of making repairs, such, for instance, as changing a tire, the load can instantly be dropped, thereby effleeting a considerable saving of time than by the use of a jack whereby the load must be lowered through successive steps.

A further object of the invention consists in the provision of a 1ifting-jack of the above character in which the lifting-bar holds all of the acting parts against accidental displacement, together with a single means for preventing accidental displace ment of said lifting-bar.

A still further object of the invention consists in the provision of a lifting-jack of the above'character which is simple in constrLu-tion, ellicient in operation, and cheap to manufacture. Y

l accomplish the above objects of the invention, and such others as may appear from a perusal of the specification and claims, by means of the construction illus-l tratcd in the accompanying drawing forming a part hereof", in which- Figure 1 is a central vertical sectional view of the lifting-jack housing, showing the movable parts in elevation. Fig. 2 is a view similar to Fig. 1, exceptthat the movable parts of the jack are shown as occupying a changed position. Fig. 3 is a sectional View on the line 3-3 in Fig. 1. Fig. 4 is a fragmentary detail front elevation of the 1 lifting jack housing. Fig. 5 is a cross sec- Specification of Letters Patent.

vided with trunnions 2]. which Serial No. 256,496.

' tional view of the lifting-bar, on the line 5-5 in Fig. 1. Fig. 6 is a front on an enlarged scale, of the upper end of the inner pawl and swinging cam-arm.

Referring to the drawings, 10 represents elevation,

the liftingbar of the device, and this bar is provided 1n one edge with a series of teeth 11, and the opposite edge of the bar 18 cut away so as to form a pair of longi tudinal parallelreeesses 12, which are separated by. a rib 13, and recesses 12 are closed at theirlower ends by means of the shoulder15,-the object of the shoulder being hereinafter described. Lifting-bar 10 has vertical movement through a passageway 16 in housing 17 of the jack, and passageway 16 is formed by the side walls of housing 17, outer wall 18, and inner wall 19. Lifting-bar 10 is moved vertically by means of a lever 20, and this lever is pro are introduced into housing 17 through internal passageways 22, the latter terminating in laterally disposed \recesses 23 (Fig. 1) the closed ends of which are adapted to re .ceive and form bearing points adapted to receive the trunmons21 Patented Scene, 1920.

ator pawls 27 and 28, and these pawls are 'aralnged relatively to the axis of trunnions 21 so that when lever 20 is oscillated said pawls will alternately be moved upwardly and downwardly and thereby intermittently move lifting-bar 1O upwardly. Pawls 27 and 28 are pivotally connected with lever 20 by means of the cylindrical bosses 30 (Fig. 3) which enter suitable apertures in a rib 31 formed along one of the side edges-of said lever. "With the heretofore described construction and arrangement of parts, as lever 20 is moved. upwardly into theposition indicated by the dotted line in Fig. 1, pawl 27 moves downwardly so as to engage the succedding tooth in lifting-bar 10 while, at the same time, pawl 28 is engaged with one of the teeth 11 and is m vi g bar 10 upwardly.

On the downward stroke of lever 20 pawl 28 iswliscngaged from teeth 11 and moves ('lfimlll'lldly while pawl 27 is engaged with: one of the teeth 11 and is moving bar 10 upwzfidly. Pawls 27 and 28 are moved alternately into and out of engagement with teeth 11 on lifting-bar 10 through the instrumentality of a fixed cam 35 carried by pawl 28 and a swinging-cam 36 pivotally connected to and moving with pawl 27 The oval shaped character of the opposing faces of cams 35 and 36 controls the alternateengagement and disengagement of the .free end of pawls 27 and 28 in the following manner. When lever 20 is elevated, the mounting of pawl 28 relatively to the axis of trunnions 21 causes said pawl to move upwardly and tance of one of the teeth 11, and during this movement of pawl 28 the integral cam 35 is carried upwardly a corresponding distance. During this upward travel of pawl 28, swinging-cam 36 moves downwardly with pawl 27 and rides over the oval face of cam and pulls swinging-cam 36 in a direction to cause pawl 27 to be disengaged. When pawl 27 nears the end of its downward travel it is free to move into engagement with teeth 11 'by means-of the additional clearance afforded by the rounding off character of the opposing faces of earns 35 and 36. On the downward stroke of 1GVGI'A2O pawl 27 is carrying the load and moves upwardly carrying bar 10 with it, while the pivotal mounting of swingingcam 36 is free to ride over the oval face of cam 35 without affecting the movement of or disengaging pawl 27 from teeth 11. During this latter operation of lever 20 pawl 28'moves downwardly free of teeth 11. The range of oscillation of lever 20 in raising lifting-bar 10 upwardly in successive steps so that the movable parts of the jack will function properly is regulated by means of a notch 40 cut into the inner wall of housing 17, as clearly shown in Fig. 4. The free end of lever 20 ishollow to receive an operating handle 41 so that the desiredleverage can be secured and whereby handle 41 can be removed to enable the jack to be placed within the length of an ordinary tool-box, such as forms a part of the equipment of all motor cars. The inner end of handle 41 is.,.widened, as at 42, (see Fig. 3) and between the widened portion 42 and the major portion of the handle 41 where it rests within the hollow portion of lever 20 it is formed wedge-shaped. This construction affords the necessary clearance to permit handle 41 to be moved and shift the widened'portion 42 laterally a sufiicient distance to cause the edge of portion 42 to project beyond the edge of lever20-and into notch 40, thereby confining the throw of lever 20 within the length of said notch.

The inner end of handle 41 is properlylocated within the hollow portion of lever-20 so as to hold the widened portion 42 within notch 40 by means of an integral lug 44 formed. on the underside of portion 42 and this lug is shifted laterally from one side to widened portion with it lifting-bar 10 the dis 7 "on the opposite side of positioning lug of lever 20 when handle 41 is oscillated.

When lug 44 is placed on one side of the positioning lug '45 the side edge of the 42 projects beyond the limits of lever 20 and moves within notch 40 in housing 17. When it is desired to drop the load, handle 41 is moved longitudinally a sufficient distance to move lug 44 clear of positioning lug 45, and after shifting lever 41 laterally to bring lug 44 45, handle 41 is again moved inwardly. In this last mentioned position the widened portion 42 will project beyond the opposite Side of lever 20 and into a notch 47 (Fig. 4) which affords a longer throw of the handle 41, and as the latter is moved upwardly an abnormal distance pawl 27 will be lowered an abnormal distance and bring the hook on its free end into engagement with inclined face 49 on inner wall 19 cansing said pawl to be disengaged f'rom'teeth 11. As pawl 2.7 moves backward in disengaging from teeth 11, under the influence of inclined'face 49 the outer face of said pawl contacts and'disengages pawl 28 from teeth 11, thereby allowing lifting-bar. 10 to freely drop.

It will be noted in examining Fig. 1 that lifting-bar 10 may extend below housing 17 to' enable a load to be lifted a greater distance than would otherwise be possible if said bar was nested wholly within the housing 17'. In this case an auxiliary block is employed to form a base for-the housing 17.

By means of the hereinbefore described construction and arrangement of parts, lever 20 and its connected pawls 27 and 28 are held, against accidental displacement while lifting-bar 10 is in its proper-operative position, and the latter is limited in its travel and against accidental displacement by means of the fianged-head 50 and a set screw 51 which projects into one of the longitudinal recesses 12 and contacts shoulder 15 formed on the lower end of liftingbar 10.

Having thus fully described my said invention, what I desire to secure by Letters Patent, is--. I v

1. A lifting jack comprising ahousing having a passageway therethrough, a toothed lifting-bar through said passageway, an oscillating lever arranged in said housing, an inner and an outer pawl arranged to pivotally connect with the lever onthe opposite sides of its pivot and alternately engaging the having moyement the adjacent face of cam 35 toothed bar by the rocking of the lever,

when the lattermoves downwardly of said lifting-bar. h

2. A lifting jack comprising a housing having a pair of internal notches of different lengths, a toothed lifting-bar having movement through said-housing, an oscillating lever arranged in said housing, an inner and an outer pawl arranged to its pivot and alternately engaging the toothedbar by the rocking of said lever, a handle arranged in said lever and "susceptible of being shifted laterally to cause the inner end of the handle to project outside the lever and into the short notch in the housing for limiting the throw of the pawl to the distance the teeth in the lifting bar are spaced apart.

3. A lifting jack comprising a housing having a pair ofinternal notches of different lengths a toothed lifting-bar having move ment through'said' housing, an oscillating leverarranged in said houslng, an inner and pivotally connect with the lever on opposite sides of an outer pawl pivotally connected to said lever on opposite sides of its pivot for alternately moving said pawls into engagement with said lifting-bar when the lever'is'oscillated, a laterally movable handle arranged in said lever for shifting the inner end of the handle into the short or long notch and thereby limit the throw of the lever to movethe pawls the distancethe teeth in the lifting-bar are spaced apart or formoving the pawls an abnormal distance for contacting a stationary cam and effect the disengagement of, the pawls from the teeth in the'bar, and a stationary cam arranged in the housing for contactingand effecting the disengagement of the free end of the inner pawl from the tooth lifting-bar when the lever is depressed an abnormal distance.

In witness whereof I ,have hereunto set my hand and seal at Indiana this 28th day of September, D. one thousand nine hundred and ei hteen..

' ALBERT [n s.]

olis, Indiana,