US1550885A - Tire-rim-breaking jack - Google Patents

Description

Aug. 25, 1925.

PATENT FFCE.

MELVIN C. DART, OF NEW YORK, I\T. Y.

TIRE-RIM-BREAKNG JACK.

Application filed August 25, 1923.

To all whom t may concern.'

Be it known that I, MELVIN C. DART, a citizen of the United States, and a resident of New York city, in the county of the Bronx and State of New York, have invented certain new and useful Improvements in a Tire-Riin-Breaking Jack, of which the following is a full, clear, and exact description.

Among the principal objects which the present invention has in view are: To avoid friction in the operation of the device; and to simplify and cheapen the construction of the apparatus.

Figure 1 is a side elevation of an apparatus showing the same in -active relation to a tire rim, fragments of a tire being shown as mounted on said rim.

Figure 2 is a section on enlarged scale taken as on the line 2 2 in Fig. 1.

Figure 3 is a section taken on the line 3-3 in Fig. 2.

Figure 4 is a detailed view on enlarged scale showing the foot plate of the jack and parts associated therewith.

Figure 5 is a perspective View of one of the breaker arms with which the apparatus is provided.

Description In the present apparatus a lifting Jack is employed in conjunction with breaker arms or links arranged to secure a three point engagement with a split rim for pneumatic automobile tires. The jack is employed when not used as a rim breaker for the usual work of raising and lowering the body of an automobile. l

To this end the jack is provided with a screw-threaded plunger 10, the threads of which are engaged by threads of a rotary nut 11.

The nut 11 has an annular liange 12, the face of which is beveled and provided with gear teeth as in a beveled gear. rlhe ends of the nut 11 form seats for ball races at both sides of the said nut wherein the balls 14 operate the races 13 being hardened as is usual in this construction. A steel washer 15 at the upper and lower bearings is introduced between the races 13 and the cover 16 and end of the standard 17, respectively.

The standard 17 is tubular having lateral extensions 18 wherein grooves are formed for a pin 19. By reason of the engagement of the ends of the pin 19 with the slots in the Serial No. 659,264.

extensions 18, the plunger 10 is elevated or depressed in correspondence with the rotation of the nut 11.

The nut 11 is rotated by means of a beveled pinion 20. The pinion 20 has a bearing on the pin 21, The pin 21 has a head 22 which enters the wrench socket 23 and serves to hold the pinion 20 in position. The pin 21 is driven through a socket in the body of the standard 17 and is there held by the retaining pin 24 which is driven through a boring provided therefor in the standard 17 and pin 21, entrance to the said boring being from above and through the shoulder on which is seated the lower washer 15.

'.lhe cover 16 is held permanently in positlon by screw bolts 25 and thereafter prevents the lift of the washer 15 covering the balls 14 in the top race of the double antifriction bearing. This enables the jack to be employed for forcefully contracting the length thereof as well as for expanding the same.

At the upper end of the plunger 10 a hook-shaped head 26 is mounted and held by means of the pin 27. The pin 27 is removably mounted on the plunger 10 to provide for the substitution of any one of a series of heads, best adapted for special purposes. 1n the present instance the head 16 has an upper extension 28, the end whereof has a hook 29 for engaging the lip of a tire rim such as indicated by the numeral 30. A dropped bracket extension 31 is extended from the opposite side of the head 26, which extension has an extended bracket 32 adapted for engaging for lifting a load at a lower level than the pad or head 26.

As is best shown in Fig. 4 of the drawings the foot 33 is parted laterally to form passageways 34. The passageways 34 are flanged on either Yside by webs 35 wherein are formed circular recesses 36, each having a narrow entrance for the passage of crossbar heads 37 on the breaker arms 33.

To insert the heads 37 into the recesses 36, it is necessary to raise the arms 38 to the upright position substantially as shown at the left of Fig. 4 of the drawings. Having inserted the head 37, the 4arms 38 are dropped to the position shown at the right of said ligure of the drawings in which position the heads cannot be withdrawn from the recesses 36.

It will be noted that in this position the heads 37 have an even and firm seat at both edges thereof against the sides of the recesses 36 on the opposite sides of the passageways 34. rIhe passageways 34 are sufficiently wide and the webs 35 sufficiently separated to provide a non-rocking engagement of the head 37 with the webs 35. This arrangement is particularly advantageous ,when the breaker arms are in position as shown in Fig. 1 of the drawings, in which position the movement of the plunger lO and parts associated therewith results in contracting or expanding the rim 30.

rlhe breaker arms 38 are provided at their outer ends with heads 39, the hooklike extension r-10 of which engages the lip of the rim 30 in a manner similar to that of the hook 29 on the extension 28.

It will be understood that when in operation the arms 38 may be swung to any desired position.

then a rim 30 is to be removed from the tire 4:1 it is found advantageous to move one of the arms 33 close to and at one side of the brake 42 in the said rim, while the other arm 38 is removed therefrom. In this position of the parts, the resistance to the movement of the latter mentioned arm is greater than the resistance to the movement of the first mentioned arm. The immediate resultof this is that the end of the split rim 30 adjacent the brake 42 is lifted, while the rim 30 is contracted sufciently to cause the lifted end to overlie the other end.

The breaking of the rim having been thus accomplished, the arms are spread to the position substantially as shown in Fig. 1 of the drawings when the continued retraction of the plunger 10 exerts a contracting strain on the whole rim 30, causing it to free itself from the tire 11. The rim 30 and breaker are now left in this position while the tire is repaired, or a substitute therefor is replaced. Vhen this is done, the pinion 2O is rotated to extend the plunger 10 with the result that the rim 30 is expanded. The expansion being continued the split ends pass each other when the resiliency of the rim disposes the two ends thereof in flush relation. If the rim be provided with a lock it is now adjusted and the pinion 20 is rotated to retract the plunger 10 until the arms 38 may be released therefrom.

The apparatus being now removed from active position within the rim, is now stowed away or the arms 38 are removed from the standard 17 when the same may be employed as a jack for lifting the car or other load, in the manner usual with jacks of this character.

It is obvious that the employment of a rotary nut such as indicated by the numeral 11 between double friction reducing bearings balances the thrust strain in both directions and relieves the strain on the pinion 20 permitting the same to be operated freely by means of hand crank or extension bar thereof which is introduced into the squared wrench socket 23 of said pinion.

Claims:

1. A tire rim breaking jack comprising a tubular standard embodying a spreading foot having radially disposed passageways therethrough and bracing webs flanking said passageways, said webs having circular recesses provided with relatively narrow edge openings thereinto; a reciprocating plunger non-rotatively mounted in said standard; means for reciprocating said plunger under power in said standard; and a plurality of breaker arms, each having a cross head at the inner end thereof iiattened substantially parallel with said breaker arms, the lesser dimension of said cross head being less than the opening to said recesses, and the major dimension being substantially equal to the diameter of said recesses whereby said cross heads may be inserted within said recesses and turned to a position in which they cannot be withdrawn from said recesses; and means provided at the outer ends of said breaker arms and said plunger for engaging tire rims for expanding and contracting the same in correspondence with the extension or withdrawal of said plunger to and from said standard.

2. A tire rim breaking jack comprising a double acting vehicle lifting jack; power means for extending and contracting the parts of said jack; and a plurality of breaker arms having pressure heads and hook-shaped extensions therefrom for engaging the outer edge of the tire rim, said breaker arms having at the inner ends thereof cross heads evenly extended at opposite sides of the longitudinal center of said breaker arms; and means for removably engaging the lower end of said jack and said cross arms while in service so that the longitudinal center of said arms and said jack are disposed in the substantial coincident plane.

3. A tire rim breaking jack comprising a screw-threaded reciprocating plunger; a standard for housing said plunger non-rotatively, said standard having a spread base provided with radially extended passageways and reinforcing webs flanking said passageways, said webs having circular recesses provided with edge openings the centers of said openings being coincident with the radii of said recesses substantially 15 degrees upward from the bottom of said base; a rotary nut, the threads of which mesh with the threads on said plunger; a housing therefor permanently mounted on said standard; a plurality of friction reducing thrust bearings for said nut disposed above and below the same and an annular beveled gear toothed flange on said nut for rotating the same; a pinion wheel rotatively mounted in said standard with the teeth thereof engaged with the teeth of said iange; and

' means whereby said pinion may be engaged by a manually operated tool for rotating said pinion.

4. A tire rim breaking jack comprising a screw-threaded reciprocating plunger; a standard for housing said plunger non-rotatively, said standard having a spread base provided with radially extended passageways and reinforcing webs ianking said passageways, said webs having circular recesses provided with edge openings the centers of said openings being coincident with the radius of said recesses substantially 45 degrees upward from the bottom of said base; a rotary nut, the threads of which mesh with the threads on said plunger; a plurality of friction reducing thrust bearings for said nut disposed above and below the same and an annular beveled gear toothed flange on said nut for rotating the same; a pinion wheel rotatively mounted in said standard with the teeth thereof engaged with the teeth of said flange; and means whereby said pinion may be engaged by a manually operated tool for rotating said pinion, said means embodying an extended shank adapted to be operatively engaged by an hand wrench, and a plurality of breaker arms removably attached to said standard when inactively disposed, and nonremovably attache-d when actively disposed, said arms being adapted for engaging a tire rim for pulling same towards the center thereof or for expanding sam'e from the center thereof.

5. A tire rim breaking jack Comprising a power reciprocated plunger; a hook-shaped head adapted for pressing outward from said jack or pulling toward the same; and a spread base for holding said jack in upright service position, said base having recesses formed therein in parallel relation to said plunger; and a plurality of breaker arms removably attached to said base when disposed inactively and non-removably when disposed actively, said arms having heads hooked to provide means for pressing outward from said base andA for pulling toward said base in correspondence with the movement of said plunger.

MELvrN o. DART.

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