US2234970A - Lifting jack - Google Patents

Description

March 18, 1941;. M- B. LUCKER 2,234,970

LIFTING JACK Y Fjled April 1'7, 1936 2 Sheets-Sheet 1 March 18,1941.

M. B. LucKER 2,234,970

LIFTING JACK 2 Sheets-Sheet l2 Filed Apri; 17, 193e;`

lll

titl

Patented Mar. i8, i941 UNITED STATE ETEN OFFIQ Auto Specialties Manuiacturlng Co... dt. Joseph, Mich., a corporation oi Michigan Application April 17, i936, Serial No. 74,969

` 14 Claims.

This invention relates to lifting jacks; and more particularly to a jack of the friction `col-- lar type especially adapted for use with automotive vehicles and the like.

dt is an object' of the invention to provide a lifting jack of the friction grip type which is of improved and simpliiied construction. In accordance with the invention the jack parts can be more easily made and assembled, thus insuring lower cost and facility of production. More specifically, the invention in one of its phases provides a jack body which surrounds the central shaft, of individual parts which may he readily `formed and assembled. These body parts may be either cast or stamped from sheet metal.

A further object is to provide a new and sim;- plified arrangement for resiliently urging the actuating clamp into normal uncanted position.

lt is a still iurther and important object of the invention to provide a lifting jack of the ltrlction grip type which has improved operating characteristics, which is rapid in placement, load contacting, and load raising and releasing, and

" yet which insures a maximum of safety at all times. ln accordance with the invention a load engaging member or saddle is provided which is adjustable to accommodate the position of the load to be raised. This member, together with the compactness of the jack as a whole and the speed with which the lifting body may loe raised along the spindle, insures speedy jaclr placement and load contacting. The loadA engading member also aids in retaining the Jael: loody parts .in assembled position. Means 4are also provided for insuring that the lowering oi the jaclr. may be rapid but positively and accurately controlled. The lowering or release means is simple and fast and yet insures absolute safety in that thelowering movement is always under positive and accurate control. More specifically in one form of the invention the release is controlled by an invariably positioned removable elongated bar, and in another form by means o an adjustable screw.

lltheiP ohjects and advantages of the invention will he apparent from the following description when tation in connection with the accompanying drawings which illustrate certain preferred emdiments ot the invention.

liu the drawings. wherein like reference numerals reier to like parts throughout:

Figure l is an elevational view showing a lifting jack constructed in accordance with one iorm ci the invention..

(ci. 25a-fics) Figure 2 is a partial longitudinal sectional view 4 oi' the jack oi' Figure l talren alongkthe line y 2-t oi Figure 3- ligure 3 is also a sectional view but along the line t-d of Figure l.

Figure t is a transverse sectional view taken along the line d--t of Figure l.

Figure 5 is a view similar toliigure but showing the actuating clamp in operated position. i

Figure 6 is an exploded view more particularly illustrating' the jacli body oi metal castings.

Figure 'l' is a detail perspective oi the load engaging saddle.

Figure d is a detail perspective oi? the holding clamp.

Figure 9 is a detail perspective ol "the actuating clamp.

Figure ld is an exploded view showing the jack body parts as made irom stamped sheet metal.

Figure ll. illustrates a modillcation oi' the invention wherein the release oi the holding clamp is enacted by means oi an adjustable screw, and

Figure l2 is a cut-away view of the device of Figure ll taken along the line lt--lt thereof.V

This application is a continuation-impart of my prior copendlng application Serial No. 43,752, filed October 5, 1935, i'or Lifting lack.

Referring first to Figures 1 to 9 inclusive, it will be seen that this embodiment oi? the invention, shown for purposes of illustration, comprises a base ld having an upstandlng shaft or standard ll xed thereto in any suitable manner as by means of a pin or the like. The standard ll carries the lifting body lt ot the ,lack which4 is adapted for sliding movement therealong. ln this form oi the invention the lifting 40 body y is composed of two metal castings I3 and It as best seen in Figure 6. These two castings are secured together at their bottoms by means of screws or rivets it which pass through holes in flanges formed at the bottoms of the castings. .i5 The body parts are secured together at the top hy means oi. the load engaging saddle lll which embraces hoth hotly' parts and which is held against removal from the body hy means oi a beaded nange lll :formed at the extreme upper portion ci the hody castings. The saddle ls retained against movement downwardly along the body members hy means oi the flange it termed thereon. The saddle is rotatable about the body so that its object or load engaging portion i9 55 may be readily moved to the desired load engaging position. The load, as illustrated, is a portion I4 of the bumper of an automotive vehicle, as the lifting jack of the present invention is particularly adapted for use in such connection. It is to be understood, however, that the jack may be applied to other portions of a vehicle or to other types of loads to be raised.

A housing 20 formed at the lower portion of the lifting body carries the actuating clamp 2| and the holding clamp 22 of the jack operating mechanism. As will be seen by reference to Figure 9, the actuating clamp has formed on the upper face thereof a lug 23 adapted for engage-` ment with the body housing when the actuating clamp is in its upper normal position as shown in Figure 2. LA pair of diametrica-lly disposed lugs 24 are also formed on the upper face of the actuating clamp to which the lower ends of a pair of springs 25 are secured. The upper ends of the springs are anchored to projections 2E formed on the lifting body members. The operating lever 21 for the jack is pivoted by means of a pin 28 to the body members and has an operating portion 29 adapted for engagement with the top of the actuating clamp at a point diametrically spaced from the projection23.

The holding clamp 22 has an extending portion 30 journalled in an opening 3| formed in the housing 20 as bt seen in Figure 3. The holding clamp is also formed with a projection 32 adapted to extend through an opening 33 formed in the housing diametrically to the opening 3|. A compression spring 34 arranged between a cup 36 formed on the lower sideof the projection 32 and a cup 38 formed on the body casting normally holds the holding clamp in canted position. The housing 2li also carries an integral projection 31 which, as best seen in Figure 1, is upwardly and laterally spaced from the projection 32 oi the holding clamp. The release bar 38, by which the jack is lowered, is adapted for cooperation on. its upper face with the housing lug 31 and on its lower face with the projection 32 of the holding clamp as will be best understood by reference to Figure l. Lug 31 forms a fulcrum for the bar.

In assembling the jack the two parts I3 and I4 of the lifting body I2 are brought into operative juxtaposition with the holding clamp 22 and the actuating clamp 2| arranged within their housing portions. The springs 25, which have been previously secured to the actuating clamp, are connected to the projections 28 on the body parts, and the springs are stretched slightly as the actuating clamp is forced down- Wardly into the housing portion 20 of the body. With the body parts thus positioned, the screws or rivets I5 may be inserted to secure the lower body portions together. The load engaging saddle I6 is then slipped over the upper portions of the body parts into engagement with the flange |8 after which the flange I1 may be -beaded over the top of the saddle to secure it ure 3 whereby to cause the biting edges of its central opening to grip the standard II and prevent the lifting body |2 from downward movement along the standard. The actuating clamp 2| is held in its normal uncanted and upward position by the springs 25. As the end of the operating lever 2'I is moved upwardly, as indicated by the arrow in Figure 2, its engaging portion 29 causes the actuating clamp 2| to cant t0 bring the biting edges of its central opening into tight engagement against the standard II. As the movement of the operating lever is continued as indicated in Figure 5, the actuating clamp acts as a reaction base causing the entire lifting casting 'to move upwardly along the standard. The holding clamp does not prevent such upward movement, but moves upwardly with the body I2 and by reason of the spring 34 preventsany retrograde movement, thus holding the body in its new upward position. As the operating lever is returned to normal position, the springs 25 draw the actuating clamp into normal uncanted upward position. The operation may be repeated until the 'lifting body is brought up to the desired position. Prior to engagement with the load, the entire lifting body may be lifted by hand upwardly along the standard II, without manipulation of the operating lever I21, the clamps 2| and 22 readily permitting this preliminary adjustment movement. The load engaging saddle member I6 may be readily revolved about the body whereby to bring its load engaging portion I9 into the desired operative position. These features insure speed of jack placement and load raising.

To release the lifting body, the release bar 38 is brought into position as shown in Figure 1 with its upper side in engagement with the housing lug 31 and its lower side in engagement with the projection 32 on the holding clamp. As the right end of the bar 38 is now lowered, as indicated by the arrow in Figure l, the spring 34 will be compressed, allowing the holding clamp to release its grip upon the standard. Downward movement of the lifting body under the load causes a corresponding lowering of the left kend of the release bar, and this results in the relief of downward pressure against the projection 32 of the holding clamp. The spring 3l thereupon causes the holding clamp to again grip the standard II. In other words, the lifting body I2 can be lowered only at the same time that the right end of the release bar is being lowered. If movement of the operating end of the release bar is stopped, the downward movement of the lifting body also immediately stops. By this means the downward movement 'of the liftingbody is under accurate and positive control at all times whereby to insure complete safety as well as ease of operation. It is to be noted that due to the positioning of the lug 31 with respect to the projection 32 of the holding clamp, the release bar 38 can only be operatively inserted in one position, that shown in Figure 1. So long as the release bar is introduced from the accessible side of the jack, adjacent the operating lever 21, it is impossible t0 improperly manipulate the bar. The release is rapid but positively controlled.

In Fiure 1o the lifting body or the Jack is shown asvformed of two sheet metal stampings 40 and 4|. These body members are of substantially the same shape as the cast body members I3 and 4 described in connection with the first illustrated embodiment of the invention, and the maniii ner of assembly and operation is the same. In the case of the stamped body members, the members will be provided with openings 42 through which pins corresponding to lugs 23 may be inserted. Also, the flanges, such as 43, I4 and I6, and the body openings, such as I6 and 41, will in this instance be formed by bending and punching the metal, rather than by casting, as is well Aunderstood ln the stamped sheet metal art. It is to be noted that the body members, whether formed by casting or by stamping sheet metal, may be readily and easily produced. There are no difficult formations to be made. Thus the barrels t8 which house the springs 25, are merely of cylindrical formation which may be readily produced either in a casting or by sheet metal stamping.

` The assembly of the body parts and the operatbill dbi

bil

lng mechanism may be effected with a minimum number of operations whereby to minimize ass embly costs.

In Figures 1l and l2 there is illustrated a modified means for securing the accurate and controlled lowering of the lifting body. ln this instance the housing 2li-of the lifting body carries a threaded boss i! into which a release screw bi is adapted to be threaded. The conical inner end iii of the release screw engages the projec-u tion 3l of the holding clamp adjacent its upper face as indicated in Figure il. is the release screw is rotated by means of a suitable operating tool, its conical inner end forces the projection of the holding clamp downwardly against the action of compression spring all whereby to release the holding clamp from the standard il. ln this instance the degree to which .the holding clamp is released will be proportional to the degrec of rotation imparted to the release screw. Accordingly therate at which the lifting body will be lowered under any given load will liliewise be proportional to the degree of rotation imparted to the release screw, and the ratel of descent will will be uniform so long as the adiust= ment of the release screw is not changed. Ey this release means the rate of load descent can he accurately and positively controlled as in the case of the first described embodiment of the invention. Claims more particularly directed Atothe structure of Figs. 1l and if are presented in my copendlng application, Serial No. 299,338, filed October i3, 1939. Also, claims to other features of the structure disclosed, but not herein claimed, are presented in the aforementioned companion application, Serial No. 43,752, filed October d, i935.

It is obvious that various modiflcationsgmay be made in the specific embodiments of the invenm tion shown fon the purpose of illustration. Accordingly the invention is not to be limited to the precise constructions shown and described, but only as indicated in the following claims.

The invention is hereby claimed as follows:

l. in a lifting jack of the friction grip type, a base, an upstanding shaft operatively carried by the base, a lifting body composed of individual pieces slidable along the axis of said shaft, a hous-f ing formed in said body, actuating and holding;

clamps in said housing embracing the shaft, and a load engaginn member carried by the lifting body, said load engaging member. embracing a plurality of said pieces and being rotatably ad instable thereon.

t. lin a lifting jaclr of the friction grip type, a base, an upstanding shaft operatively carried by the base, an elongated lifting body comprising plurality of individual elongated sheet metal pieces collectively encircling said shaft and slidable therealong, friction gripping means arranged within said body, means for securing said pieces together at the top and bottom thereof, and means on at least one of said pieces forming a pivotal engagement 'for `said friction gripping means.

3. In a. lifting jack of the friction grip type, a base, an upstanding shaft operatively carried by the base, a lifting body including a pair of individual body pieces secured together and slid- 'able longitudinally of the shaft, a housing formed in said body, a friction clamp in said housing em bracing the shaft, and a pair of springs secured to said clamp-for holding it in position, each of said springs being anchored to one of said body pieces. l

4. In a lifting jack of the friction grip type, a base, an upstanding shaft operatively carried by the base, a lifting body embracing said shaft and slidable therealong, a housing formed in said body, a friction clamp in said housing embracing the shaft, and a pair of springs secured to said clamp at diametrically spaced points and anchored to said body for holding the clamp in position within the housing.

5. ln a lifting iaclr of the friction grip type, a shaft, a body embracing the shaft, a housing formed in said body, a friction clamp mounted in said housing embracing the shaft, and a pair of springs connected to said clamp at diametricaily spaced points thereon and anchored to the body for holding the clamp in position within said housing.

d. ln a lifting jack of the friction grip type, an elongated shaft, a body embracing said shaft, said body and shaft being relatively slideble, a holding clamp carried by the body embracing the shaft and adapted to be normally coated to grip the shaft, whereby to hold the body and shaft against relative movement in one direction., a radially er tending projection on the holding clamp, and a lug formed on said body, said lug being laterally displaced with respect to the proiection whereby to facilitate the proper positioning of a release bar-adapted for application to the projection and fulcrum movement upon said lug.

l. in a lifting iaclr of the friction grip type, an elongated shalt, a body on said shaft, said shaft and body being relatively movable, a nous ing formed in the body, a locking clamp arranged in the housing embracing the shaft for locking the body and shaft against movement in one di rection, a projection cn said clamp extending ram dially therefrom, resilient means for normally urging the clamp so as to urge the projection upwardly to cant the clamp in loclring position, and a lug formed on the body, said lug being spaced laterally and upwardly from said projection whereby 'to facilitate the control of a release bar adapted for application to the projection and fulcrurn oyelnent upon the lun.

o. in a lifting ,lach of the friction grip type, a shaft, a body encircling the shaft, a houston formed in said body, an actuating friction clamp mounted in said housing einbre clog the sl'iaft, pair of k.springs connected to said clamp at nietrlcally spaced points thereon and anchored to the body for holding the clamp in position with in said housing, a holding friction clamp also mounted within said housing and embracing the shaft, a spring engageable with the iuildinn.` clamp and with the housing for normally holding clamp in cantecl friction gripping engagement upon the shaft, and release means engageable with the housing and the holding clamp for mov ing the latter touncanted position against acticnof its spring.

9. In a lifting jack of the friction grip type, axbase,` an upstanding shaft operatively carried by thebase, an elongated lifting body comprising a plurality of individual elongated body pieces collectively encircling said shaft and slidable therealong, said body pieces forming a substantially enclosed housing, friction gripping means arranged within said housing,.and means for securing said body pieces together at the top and bottom thereof.

10. In a lifting jack, a base, an upstanding shaft -operatively carried by the base, a lifting body slidable along and rotatable about said shaft, frictiony gripping means carried within the body for frictionally gripping the body to the shaft, a laterally extending member pivoted to the body and adapted on pivoted movement to operate said friction gripping means, a load engaging member mounted on said lifting body, said load engaging member being shiftable relative to the lifting body about the axis of the shaft, whereby the lifting body may be shifted about the axis of the shaft to position the laterally projecting member in any desired plane of operation without axial displacement of the lifting body relative to the shaft, and the load engaging member may be independently shifted about the axis of the shaft for engagement with a load to be raised.

ll. In a lifting jack of the friction grip type. an elongated shaft, a body embracing said shaft, said body and shaft being relatively slidable, a holding clamp carried by the body and embracing the shaft and adapted to be normally canted to grip the shaft,\whereby to hold the body and shaft against relative movement in one direction,

the

a radially extending engagement surface on the holding clamp, and a cooperating engagement surface formed on said body, said body engagement surface being laterally displaced with respect to the clamp engagement surface whereby to facilitate the proper positioning of a release bar adapted for application to the clamp engagement surface and fulcrum movement upon said body engagement surface.

12. A vehicle jack comprising a supporting column, a split tubular member mounted on said column for actuation therealong, a vehicle supporting portion carried by said tubular member, said vehicle supporting portion comprising a rigid sleeve telescoping with said split tube and having at least one receiving ledge portion defined thereby to provide a seat, said sleeve comprising a ferrule for reinforcing said split tube, and means projecting from said tubular member mounted on said supporting column for providing a seat for said sleeve.

13. In a lifting jack of the friction grip type, a base. an upstanding shaft operatively carried by the base, an elongated lifting body comprising a plurality of individual elongated body pieces collectively encircling said shaft and slidable therealong, friction gripping means arranged within said body, means for securing said pieces together at the top and bottom thereof, and means on at least one of said pieces forming a pivotal engagement for said friction gripping means.

14. A vehicle jack structure as defined in claim l2 wherein the rigid sleeve is rotatably mounted lupon the split tube, whereby to be rotatably adjustably positioned thereon.

MILLARD' B. LUCKER.

Images