US2227394A

US2227394A - Lifting jack

Info

Publication number: US2227394A
Application number: US101693A
Authority: US
Inventors: Millard B Lucker
Original assignee: Auto Specialties Manufacturing Co
Current assignee: Auto Specialties Manufacturing Co
Priority date: 1936-09-21
Filing date: 1936-09-21
Publication date: 1940-12-31
Anticipated expiration: 1957-12-31

Description

M. B. LUCKER LIFTING JACK y Filed Sept. 2l, 1936 2 Sheets-Sheet l Dec. 31, 1940.'

M.B.LUCKER LIFTING JACK Filed Sept. 21, 1936 2 Sheets-Sheet 2 Patented Dec. 3l, 1940 UNITED STATES 2,227,394- LIFTING JACK Millard B. Lucker, St. Joseph, Mich., assignor to Auto Specialties Manufacturing Company, St.

Joseph. Mich., a corporation of Michigan Application September 21,1936, Serial No. 101,693

13 Claims.

This invention relates to lifting jacks, and more particularly to a jack of the friction collar type especially adapt-ed for use with automotive vehicles and the like. Thel present invention is particularly adapted as animprovement over the type of jack disclosed in my prior led application, Serial No. 74,969, filed April 17, 1936. It is to be understood, however, that in so far as certain aspects of my present invention are.

concerned, such aspects are adaptable to types of jack other than that disclosed in said pending application.

In jacks of the type disclosed in my prior application, it has been found that in certain instances, and particularly when the upstanding shaft or standardwhich corresponded to standard in my prior led application-became somewhat rusty, the lifting collar or actuating clamp 2|, when moved downwardly to the position shown in Figure 5 of said application, tended to stick to the upright so that the springs of said prior application were insulloient to slide the clamp back to normal position, or that shown in Figure 2 of said prior application. 2U Therefore, one of the objects of my present invention is to provide a jack of the type shown in my prior application, wherein positive means is provided for returning the actuating or lifting clamp toi its upper position, whereby to eliminateany possibility of the same sticking in the lowermost position.

Another object of my invention resides in providing a jack of the foregoing and other types wherein the manually operable member for operating the actuating clamp 2| is provided with means for not only positively moving the actu-x ating clamp downwardly relative to the stationary standard, but is also provided withupositive means for moving the actuating clamp upwardly to return it to a new clamping position.

These and other objects of my invention will `Figure 5 is a view similar to Figure 2 but showing the actuating clamp in operated position;

Figures 6 and 7 are views showing two modications of the cross section of the standard; and

Figures 8 to 11 are other modifications of the 5 manner of operating the actuating clamp from the actuating lever. E

Referring `to the drawings, it will be seen that I the present invention is best illustrated as applied to a jack of my pending application, Serial 10 No. 74,969, aforesaid, and comprises a base l0 having an upstanding shaft br standard fixed thereto in any suitable manner, as by means. of a pin or the like.' The standard carries a lifting body I2 of the jack which is adapted for 154 sliding movement therealong. 'Ihe lifting body is preferably composed of two metal 'castings I3 and |4, as bes-t seen in Figure 4. These two castings are preferably secured together at their bottoms by means of screws or rivets I5 which 2o pass through holes in flanges formed at the bottoms of the castings. The body 'parts' are secured together atthe top by means of the load engaging saddle -I6 4which embraces both body parts and which is held against removal from the body 25 by means of a beaded flange formed at the extreme upper portion of the body castings. The saddle is retained against movement downwardly along the body members by means of the flange I8 formed thereon. 'I'he saddle is rotatable about 3o the body so that its object or load engaging portion I9 may be readily moved to the desired load engaging position. The load, as illustrated, is a portion B of the bumper of an Vautomotive vehicle, as the lifting jack of the present invention is particularly adapted for use'in such con-` nection. As is well known, the bumper is disposed at .considerablefheight above the ground. It is 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 a. jack operating mechanism. As will be seen by reference to Figure 5, the actuating 'clamp has-formed on the upper face thereof a lug 23 adapted for engagement with the body housing when the actuating clamp is in its upper normal position, as'shown in Figure 2. A pair of diametrically disposed lugs '5o 24 are also formed on the upper face of the actuating clamp to which the lower vends of a pair of springs 25 are secured. .'I'he upper ends of these springs are anchored to projections 26 formed on the lifting body members. 'I'he op- 55 lerating 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 projection 23. The holding clamp 22 has an extending portion 30 journalled in an opening 3| formed in the housing 20, as best shown 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 is arranged in a recess 35 formed on the lower side of the projection 32 of the holding clamp 22 and the lower face 35 of the housing I2, whereby said spring normally holds the holding clamp `irrcanted position. The housing also carries an integral outstanding projection 31 which, as best shoyvn in Figure 1, is upwardly and laterally spaced from the projection 32 of the holding clamp. The release bar 36, 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 1. Lug 31 forms a fulcrum for this bar.

All of the foregoing construction is shown in my prior application, Serial No. 74,969. The present invention differs therefrom by the provision of interconnecting means between the actuating clamp '2| and the actuating lever r2I, which devices are provided with means for positivelyraising the actuating clamp whether or not the springs are present. It is understood.

however, that I prefer to kprovide my jack with fit into the notch formed between the furcations` 38 and 39 in the assembly of the jack.

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-I arranged within their housing portions. The springs 25, which have been previously secured to the actuating clamp, are connected to the projections 26 on the body parts, and the springs are stretched slightly as the actuating clamp is forced downwardly into the housing portion 20 of the body. With the body parts thus positioned, the screw: 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 I8, after which the flange I1 may be beaded over the top of the saddle to secure it in position. The saddle in turn secures the upper portions of the body members together. The compression spring 34 and the operating lever 21 may then be mounted in position, after which, upon compression of the spring 34, the entire movable lifting portion of the jack may be moved downwardly about the standard' I I. assembling the device the prong 40 on the actuating lever 21 has been inserted between the

furcations

38 and 33 of the actuating clamp 2|.

It will be understood that in thus The standard shaft insures that the springs 25 will not slip oif of the lugs 26.

In operation, the compression spring 34 normally cants the holding clamp as shown in Figure 3, whereby to cause the biting edges of its central opening to grip the standard and prevent the lifting body I2 from downward movement along the standard. The actuating clamp 2| is held in its normal uncanted and upward position by the springs 25 when such springs are used. As the end of the operating lever 21 is moved upwardly, as indicated by the arrow in Figure 2, its engaging portion 2S causes the actuating clamp 2| to cant whereby to bring the biting edges of its central opening into tight engagement against the standard I I. 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 prevents'any retrograde movement, thus holding the body in its new upward position. As the operating lever is returned toI normal position, the lug 40 positively 'engages the under side of the furcation 38, thereby positively returning the actuating clamp to upward position. The springs 25 draw the actuating clamp into normal upward uncanted position, thus assisting the positive movement of the connection between the actuating lever 21 and the actuating clamp 2|. This positive upward movement of the actuating clamp 2| will overcome any tendency of-the clamp to stick due to the presence of rust or dirt on the standard II, which might otherwise prevent the return of the actuating clamp to uncanted position in the event that the rust or dirt is strong enough to overcome the force of the returning springs 25. 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 21, the clamps 2| and 22 readily permitting 'this preliminary adjustment movement. Theiload 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 36 is brought into position as shown in Figure 1 with its upper side in engagement with the housing lug31 and its lower side in engagement with the projection 32 on the holding clamp. As the right end of the bar- 36 isnow lowered, 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 end of the release bar, and this results in the relief of downward pressure against the projection 32 of the holding clamp. T he spring 34 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.l By this means the downward movement of the lifting body is under accurate and positive control at all times whereby to insure 4complete safety as well as ease of operation.

In Figures 6 and 7 of the drawings I have shown different cross sectional shapes of the standard I I. These are shown at I I' and I I respectively. Referring to Figures 8 to 11 of 4the drawings, I have illustrated. many diiferent ways of obtaining substantially the same result shown by the mech- -anism in Figures 1 to 5, inclusive, it of course being obvious that other ways may likewise be used within the scope of the present invention.

In Figure 8 I have shown the actuating clamp 42 as provided with an upstanding lug 44 spaced from the top surface of the actuating lug so as to provide a pocket in which a prong 48 on the actuating lever 4E is adapted to operate, the prong 4d serving to push downwardly on the top surface of the actuating clamp 42 in order to cant the actuating clamp 42. 'Likewise the prong 48 cooperates with the tooth or lug 44 for turning the actuating cam in vcase the cam h-as a tendency to stick in its clamping action. In this construction the hook or prong 44 will cooperate with the tooth on the handle socket of the actuating lever 4t, thereby lifting the actuating cam to its uncanted position at the top of the stroke.

lin Figure 9 a similar result is accomplished by means of a link 52 pivotally connected as at 5B to the end portion 60 of the actuating clamp ttl rIhe other end of the link 52 is slotted as at'56 to receive a pin 54 integrally formed or fastened to the actuating clamp 50. In this c-ase the action is substantially the same.

In Figure 10 the link 6E is formed on the actuating clamp 94, being provided with 'a slot BB in which a pin 'I0 on the prong 'I2 of the actuating lever 'i4 operates so that when the lever 'I4 is raised the prong 'l2 thereof will press downwardly on the top of the actuating clamp 64 to cant the same as hereinbefore described, and then on the return stroke of the actuating lever 'I4 the lost motion connection will first take place, .after which the pin 1I] will ride against the upper surface of the slot 68 to lift the actuating clamp 64 to its uncanted position.

A similar 'result is obtained las shown bythe mechanism in Figure 11, wherein the two furcations dll and 82 of the actuating lever 'I8 are on opposite sides of the actuating clamp I9. In each of these instances I prefer to use the actu ating clamp with the spring meansshown in dotted lines', all as hercinbefore described in connection with the operation of Figures i to 5, -inclusive.

It is understood that yin some instances the present invention may be adapted to a type of friction grip lifting jack or shore wherein instead of having a leversuch as the present 4lever 2l permanently pivoted to the body I2, the levervis independent thereof and is adapted for insertion through an opening in the housing to engage the actuating clamp. .In this type of construction the independent lever is provided with means forming a disconnectible fulcrum point with the body, and

obviously will be provided with the cam 29 andv the lug 40, which latter lug is positioned between the furcations 38 and 39 on the actuating clamp 2l when the lever is placed in proper actuating position. i The claims of this case are directed more particularly to the operative connection between the operating lever and the actuating clamp, and associated structures, other features disclosed but not herein claimed, being claimed in applicants copending applications, including applications,

Serial No. 43,752, filed October 5, 1935, and Serial No. 74,969, filed April 17, 1936.

It ls obvious that various modifications may be made in the specific embodiments ofthe invention shown for 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.

y The invention is hereby claimed as follows:

1. In a lifting jack of the friction grip type, an elongated support, a body embracing the support and movable relatively thereto, a holding clamp on the body and embracing the elongated support, said holding clamp being normally canted to prevent relative movement between the body and the elongated support in one direction, release means for uncanting the holding clamp to allow such movement, and an actuating clamp embracing the elongated support and( normally uncanted relative to said elongated support, said actuating clamp having furcations, said body having an i opening opposite said furcations adapted to receive a lever, 'said lever having a cam-like portion adapted to engage the actuat- V ing clamp whereby to cant the clamp and to 2. In a lifting jack of the friction grip type, anv

elongated support, a body embracing the support and movable relatively thereto, a holding clamp on the body and embracing the elongated support, said holding clamp being normally canted to prevent relative movement between the body and the elongated support in one direction, release means for uncanting the holding `clamp to allow such movement, an actuating clamp embracing the elongated support and normally uncanted relative to said elongated support, said actuating clamp having furcations, said body having an opening opposite said furcatlons adapted to receive a lever, said lever having a cam-like portion adapted to engage the actuating clamp whereby to cant the `clamp and to cause the relative movement'of said body to said support in a direction along said support, said lever also having a lug insertable between the furcations of said actuating clamp whereby on move ment of said lever to return the canted actuating clamp to normally uncanted position, and spring means for normally urging said actuating clamp to normal uncanted position.

B. In a lifting jack of the friction grip type, an

f elongated support, a body embracing the support ing clamp toallow such movement, an actuating` tions on said actuating clamp. and an actuating lever adapted to be inserted through said opening, said actuating lever having a portion adapted to engage the actuating clamp to cant the clamp relatively to the elongated support whereby said body may be moved longitudinally of and relatively to the elongated support, and said lever also having a lug adapted to lie between the furcations of said actuating clamp whereby on proper movement of said lever to shift said actuating clamp to uncanted position relatively to said elongated support` 4. In a lifting jack of the friction grip type, an elongated support having a base, a body embracing the support and relatively movable to the support, a holding clamp anchored on the body and embracing the elongated support, said holding clamp being normally canted to prevent relativemovement between the body and `the elongated support in one direction, release means for uncanting the holding clamp to allow such movement, an actuating clamp embracing the elongated support,said actuating clamp having an upstanding lug disposed on one face thereof and adapted to engage the body at a point lying on a diametral line through the actuating clamp whereby to ,form a pivot for canting and uncanting movement between the actuating clamp and the body respectively, spring means engaging the actuating clamp at points passing through a diameter of the actuating clamp disposed at right angles to the diametral line on the actuating clamp passing through the aforementioned pivotal lug of the actuating clamp for normally urging the actuating clamp to uncanted position relatively to the body and to the elongated support, -said actuating clamp having spaced apart portions disposed in a diamet'ral line passing through the pivotal lug for the actuating clamp, and an actuating lever having a cooperative portion Vadapted to engage one of said last mentioned portions on the actuating clamp for shifting the actuating clamp to uncanted position land for shifting the body relatively to the elongated support, and having another portion adapted to engage the other last mentioned portion of said'acytuating clamp for positively returning the actuating clamp to uncanted position.

5. In a lifting jack, a base, an upstanding shaft mounted thereon, a load lifting member, means for frictionally gripping the member to the shaft, said means comprising a pair of frictional clampsl one of which forms a part of means to move the member along the shaft and the other of which is adapted to hold the member against retrograde movement on the shaft, means including a spring and a lever member for controlling said moving clamp, said ,lever member being pivotally mounted on said load lifting member and having a pair of spaced portions adapted to engage opposite portions of said moving clamp whereby -to enable actuation of this clamp by the lever member into gripping and non-gripping positions with respect to the shaft, said lever member being adapted to fulcrum 'upon the moving clamp to advance the load lifting member along the shaft, a spring urging the holding clamp into gripping engagement, and meansl for releasing the holding clamp.

' 6. In a lifting jack of the friction grip type, a

base, an upstanding shaft mounted thereon, a

lifting body'slidably mounted on said shaft, a laterally extending load engaging member carried by said lifting body, a holding clamp 'mounted within said body and embracing the shaft, a

spring for canting said holding clamp whereby to prevent movement of the body downwardly along the shaft, release means for uncanting the holding clamp to permit such movement, an actuat-4 ing clamp also mounted within the body and embracing the shaft, spring means for controlling the operation of said actuating clamp, and a lever assembly pivoted to the body, said actuatingclamp having a radially projecting operating portion, andthe lever assembly being provided with a pairlof spaced portions adapted to engage the radially projecting operating portion of said actuating clamp on the upper and lower sides thereof whereby to enable the canting and uncanting of the actuating clamp as the lever assembly is pivoted with respect to the lifting body.

'7. A lifting jack comprising a base, a load-lifting member operatively supported by the base, and means for moving the load-lifting member relative to the base comprising al housing, a pair of friction clamps associated therewith, and a shaft extending through the housing and the clamps, one of said clamps being an actuating clamp and the other of said clamps being a holding clamp, a spring for holding the holding clamp in canted gripping engagement with the shaft,

a spring for holding the actuating clamp in predetermined position with respect to the shaft and for controlling the operations of said actuating clamp, an operating lever pivotallyJr mounted, on the housing, said actuating clamp being provided with a pair of spaced projections and the operating leve'r being provided with a projection adapted to lie between the spaced projections of the actuating clamp and to operatively contact therewith during the pivotal movements of the lever, the operating lever projection being adapted to engage one of the actuating clamp projections to effect the canting of the clamp and the lifting movement ofthe jack as the operating lever is pivoted in one direction, the actuating clamp spring serving to maintain said operative contact during reverse pivotal movement of the operating lever, and said operating lever projection being adapted to makel operating contact with the other clamp projection to effect the uncanting of the clamp in the event of the failure of operation of said spring.

8. A lifting jack comprising a base, a load-lifting member operatively supported by the base, and means for moving the load-lifting member relative to the base comprising a housing, a pair of friction clamps associated therewith, and a shaft extending through the housing and the clamps, one of said clamps `being an actuating clamp and the other of said clamps being a holding clamp, a spring for holding the holding clamp in canted gripping engagement with the shaft, a 'spring for holding the actuating clamp in predetermined vposition with respect to the shaft and for controlling the operations of said actuating clamp, an operating lever pivotally mounted on the housing, said actuating clamp being provided with a pair of spaced operating surfaces and the operating lever being similarly provided with a pair of spaced operating surfaces adapted to respectively operatively contact with the operating surfaces of the actuating clamp during the pivotal movements of the lever, one of the operating surfaces of the lever being adapted to engage one of the operating surfaces of the actuating clamp to effect the canting of the clamp and the lifting movement of the jack as the operating lever is pivoted in one direction, the actuating clamp spring serving tormaintain said operative contact 75 during reverse pivotal movement of the operating lever, and the other operating surface of the lever of the clamp to effect the uncanting of the clamp in the event of failure of operation of said spring.

.9. A lifting jack comprising a base, an upstanding shaft mounted thereon, a` load-lifting housing longitudinally slidable on the shaft, and means `for moving the load-lifting housing along the shaft comprising a pair of friction clamps Vassociated with the housing and mounted on the shaft, one of said clamps being an actuating clamp and the other of said clamps being a holding clamp, a spring for holding the holding clamp .in canted gripping engagement with the shaft,

a spring for holding the actuating clamp in predetermined position with respect to the shaft and for controlling the operations of said actuating clamp; an operating lever pivotally mounted on the housing. said actuating clamp being provided with a pair of spaced projections and the operating lever being provided with a projection adapted to lie between the spaced projections of the ac- Atuating clamp and to ,with during the pivotal movements of the lever,

the operating lever projection being adapted to engage one of the actuating clamp projections to effect thecarnting of the clamp and the lifting movement of the jack as the operatingl lever is pivoted in one direction, the actuating clamp spring serving to maintainsaid operative contact during reverse pivotal movement of the operating lever, and said operating lever projection being adapted to make operating contact with the other clamp Aprojectionto effect the uncanting of the clamp inv the event of the failure of operation of said spring.

,10. A lifting jack comprising a base, an upstanding shaft mounted thereon, a load-lifting housing longitudinally slidable on the shaft, and means for moving the load-lifting housing along the shaft comprising a pair of friction clamps operatively contact thereassociated with the housing and mounted on the shaft, one of said clamps being an actuating clamp and the other= of said clamps being a holding clamp, a spring for holding the-holding clamp in canted gripping engagement with the shaft, a spring for holding the actuating clamp in predetermined position with respect to the shaft and for controlling the operations of said actuating clamp, an operating lever pivotally mounted on the housing, said actuating clamp being provided with a pair of spaced operating surfaces and the operating lever being similarly provided with a pair of spaced operating surfaces adapted to respectively operatively contact with the operating surfaces of the actuating clamp during the pivotal movements of the lever, one of the operating surfaces of the lever being adapted to engage one of the operating surfaces of the actuating clamp to effect the canting of the clamp and the lifting movement of the jack asA the operating lever is pivoted in one direction, the actuating clamp spring serving to maintain 4said operative contact during reverse pivotal movement of the operating lever, and the other operating surface of the lever being adapted to make operating contact with the other operating surface of the clamp -to eifectthe uncanting of the clamp in the event of failure of operation of said spring.

11. A lifting jack as defined in claim 8 wherein the spaced operating surfaces of the operating lever are provided respectively on spaced operating members associated with the operating lever.

12. A lifting jack as defined in claim 10 wherein the spaced operating surfaces of the operating lever are provided respectively on spaced operating members associated with the operating.

lever.`

13. A lifting jack as dened in claim 8 wherein the spaced operating surfaces of the actuating clamp are provided on a projectionextending radially from the body of the actuating clamp. B. LUCKER..