US2193187A - Last jack - Google Patents

Description

March 12, 1940. w, BAXTER 2,193,187

LAST JACK Filed April 7, 1939 lPatented Mar. 12, 1940 PATENT OFFICE A T LAST'JACK y William L. Baxter, Marblehead, Mass.',assignor4 to United Shoe `Machinery Corporation, `Bor- `ough of Flemington, N. J., a corporationmof 'New VJersey l `Application April 7, 1939, "serial No. 266,521 f '7 o1eims.- `l(o1. 1ra-15.1)

The present invention relates-,to last jacks and is illustrated herein'as embodied in ajack adapted` for use in disassembling a last having separable fore and heel parts without disturbance `of the forepart of a shoe made on the last.

In one"type of suchlasts, as exemplified by that disclosed in Letters Patent No.` 2,054,935, l

granted on September22, 1936, "in the name of nected bya locking bolt and a sliding joint so constructed that when the bolt is moved into its` inoperative position the last parts may be moved with respect to each other in such a direction that the forepart and heel part may be moved `fr`eely away from each other preparatory to the removal of the forepart of the last from the shoe.

The above-mentioned Hadaway patent also discloses a jackadapted for use in disassembling a last of the above type, the jack being provided with two separately operated instrumentalities one of which moves the locking bolt into its inoperative position and the other of which presses upon the forepart toslide it with respect to the heel part. It is apparent that the movementof operation, of theiorepart pressing means; `and that an operators production is impaired by' any time lag between the arrival of the locking bolt in itsgoperative position and thebegnning of the application of pressure against the forepart.

Accordingly, itis a principal object oi this inventlon toyprovide an improved jack of the above and which will insureth'e optimum sequence the operationioi the locking bolt and the applif cation of pressure against the iorepart.

yTo this end, the invention provides manually operated means forfoperating the locking bolt` 404 and pressingfupon theforepart of a last of the above typegin timed relation and in the order namedwhereby thejforepart of thellast and the shoe thereon are moved relatively to the heel `part after the last parts have been unlocked.` `les `herein illustrated` the above-mentioned partpressing `means to be delayed during suoliA movement of the bolt as is necessary to unlock the lest pensent immediately thereafter eetuates the pressing means to slidethe'forepart on the heel part.

" Another feature of the invention residesfin `the provisionA of means for `holding the last onfthe J. B. Hadaway, thefore and heel partsare con-` theilooking bolt will be :frictionally impeded or` may possibly `be prevented by the premature` type which Vcan be easily and quickly operated jaclvagainst the pressure of the forepart pressing'V means which tends to-lpush the last off the jack.

These and other features of the invention comprising certain combinations and arrangements of parts will `be apparent from the following description of a preferred embodiment `of the inn vention shownin the drawing, in` which:

Fig. 1 is a' viewin side elevation of a jack f embodying the invention, the heel part of a last on the jack, and a lasted shoe being shown in section; f f

Fig. 2 is an end elevation of the joint between` the fore andheel parts of thelast of Fig. 1 looking toward the ,forepart perpendicular to the joint surfaces; y Fig. 3 is a View in side elevation, partly in section, `illustrating the jack and last after thefore part has been slid upon the heel part, and

Fig. 4is a front elevation of the `jack as viewed in the'direction of `the arrow of Fig. 1.

`The last, which, will be described herein only tothe extent rWhich is necessary for an under l standing of the use of the illustrated jack, and

which' is similar, to that disclosed inthe abovementioned Hadaway patent, comprises a forepart IU andheel part l2 having plane joint surfaces I4 on which the fore and heel parts are arranged tojslide at such an angle that the heel parts of the vlast and of valasted shoe thereon may be vfreely separated as will `be clearly `understood from acomparison of Figs. 1 and 3` The heel part l2 of the last comprises auheel plate it, a thimble l1, and a bonding plate i3, all of which are effectuallyintegral With each other, the latter having a heightwiseextending slottZ formed therein. Studs` 22 ,carried by a block 23 firmly embedded inthe forepart l and Whichrclosely t between the sdesoi the slot 20 are provided with heads 24` arranged to overlie portions of the bonding plate I8 `contiguous to itsslot so -as to hold the joint surfaces I4 of the last parts in contact` With each other. To permit the last parts to be readily separated from each other. upon being movedinto the relationinwhich they are illustrated in Fig. 3, the slot 2l] is provided with two circularenlargements 26, 21 of suflicient size and so spaced-'as to admit freely the heads 24 ofthe studs 22.` u

In order to prevent any sliding action between the `last parts `when they are'in their assembled relation, a locking bolt 28 slidably mounted in the block `23 is arranged normally to project `beyond the joint surface I4 of the iorepart into the enlargement 21 in the bonding plate I8. The

`leen:- 28 is urged outwardly of nee bleek 2s by e jack having means for holding the heel part, means for moving the locking bolt to, and holding it in, inoperative position, means for pressing upon the forepart in the vicinity of the joint to displace the forepart relatively to the `heel part, and manuallyoperated means for operating the two last-named means in the order named to unlock the last and to displace the forepart thereof and a shoe thereon relatively to the heel part while holding the locking bolt in inoperative position. l

5. A last pulling `iack for removing from a shoe a last having a heel part and forepart which are separable and a sliding joint between the last arranged to move said bolt into inoperative position, and means for operating said member and plunger in succession, thereby to move the forepart relatively to the heel part after the locking bolt has been moved into its inoperative po-` sition.

6. A last pulling jack for removing from a shoe a last having a `removable heel part, a iorepart with a sliding joint between them and a locking bolt to prevent such sliding action, said jack havi ing means for holding the heel part, a` lever pivoted on the jack frame and having one end arranged, when the lever is swung; to contact with the locking bolt and move it to inoperative position, a manually operated member connected to the lever to swing the lever as stated, a pushing member arranged `to press upon the forepart` 5 to slide it upon the heel part when unlocked, and a lost motion connection between the manually `operated member and the pushing member whereby the forepart is so slid upon the heel part after the lever has moved the locking bolt l0 to inoperative position.

7. A last pulling jack for removing from a shoe a last having a removable heel part, a forepart `with a sliding joint between them and a locking bolt to prevent such sliding action, said jack hav- 15 ing means for holding the heel part, a lever pivoted on the jack frame and having one end arranged, when the lever is swung, to contact with the locking bolt and move it to inoperative position, a manually operated swinging member linked to the lever to operate the lever and having a slot, a pushing member arranged to slide in the jack frame and to push upon the forepart when so slid thereby to move the forepart relatively to the heel part, and a link extending 25 between the pushing member and the slot, whereby the manually operated swinging member will pick up the pushing member after it has operated the lever to render the locking bolt inoperative and to displace the forepart and a shoe thereon `3 relatively to the heel part.

WILLIAM L. BAXTER.

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