US1708971A - Lasting jack - Google Patents

Description

,wApril 16,1929. T. M. KNOWLAND ET AL LASTING" JACK 2 Sheets-Sheet Filed Dec. 13, 1927 April 1929- T. M. KNOWLAND' ET AL 1,708,971

LASTING JACK Filed Dec. 15, 1927 2 Sheets-Sheet 2 Jaye/00076:

Ll'llii'lllllill' JACK.

Application filed ffieeember 13, issv. serial 1%. 239,7?0.

This invention relates to an improvement in lasting jacks.

The object of the invention is to provide lasting jack which. will firmly grasp the 15 last and which can be manipulated by the llli operator to turn the last into a varietyef ilill'erent positions, so that the shoe which being; made upon the last may be conveniently operated upon.

The invention consists in the combination and arrangement of parts set forth in the following specification and particularly pointed out in the claims thereof.

Referring to the drawings:

ll igure 1 is a side elevation partl tion of our improved lastingjacl, a last being shown in section mounte l thereon.

l ig. 2 is a sei'it'ional elevation taken on line 93-42, 1.

Fig. 3 is an. underneath plan of the carrier forming a part of the last holder.

Fig. 4; is a sectional plai'i brolren away taken on line 4r-4l, l ig. 1.

Fig. 5 is a side elevation of the lasting in secjack broken away, with a last shown in see tien mounted. thereon. 1

l ig. (3 is a detail side elevation of the slide;

big. 7 is a front elGWtlIlOll of the slide.

Fig. 8 is a top plan view of the slide.

9 is an underneath plan view of the slide.

liilre numerals refer to lilreparts through out the seve 'al views of the drawings.

ln the drawings, 10 is a stationary mom her adapted to be fastened to a suitable support. 11 is a braclret which is rotatably mounted upon a stud 12 having screwthreided engagement with the stationary member 10. A spring 125 is positioned in a recess 1ain the bracket 11 and bears at one end against the head 15 of the stud and at the other end against the bottom of the ccss 1 1-, thus forcing the bracket against the contact with each other.

The bracket 11 is bifurcated at its outer end to receive a connecting member 17 which is rotatably mounted upon a stud 18 fast to one arm 19 of the bifurcated end of the bracket 11. The connecting member is pro vided with a recess 20 in which is positioned a spring- 21 hearing at one end thereof against the bottom of the recess 20 and at the other end against the head of the stud 18, thus forcing the connecting member against a friction washer 22 interposed between. it and the arm 19. It will thus be seen. that the connecting member 17 can be rotated upon the stud 18 and held against accidei'ltal displacement by the spring; 20 and the friction washer 22.

it last support 23 is rotatably mounted upon the connecting member 17 and consists of a carrier 2st and slide 25. The carrier 1st has fastened thereto a stud 26 which is rotatably mounted in the connecting member 1'? and has a spring 27 interposed between the head of said stud and the bottom of a recess 28 provided in the connecting member 17 and. in which the spring 27 is posi tioned.

A friction washer 29 is interposed between the connecting member 17 and the carrier 24-, so that the last support a Whole can be rotated about a vertical axis and the same is held against rotation, about its vertical axis by a latch 30 pivoted at 81 to the carrier 2% and provided with a teeth 32 which projects into a recess 33 in the connecting member 17. The latch 30 is provided with notches 3st and which are adapted to be engaged by a spring pawl 36, so that the latch 30 may be held in position to lock the carrier. against rotation upon the connecting member 17, or it may be positioned out of locking engagement therewith.

l l hen in the position illustrated :inFig. 1, the carrier is locked against rotation upon the connecting member. If, however, the latch is thrown downwardly, so that the pawl. 86 engages the notch 3st, then the carrier will be out of locking engagement with the connecting member.

The slide 25, illustrated in detail in Figs. 6, 7, 8 and 9, consists of a base 37 provided with a slot 38 and a shank 39 which extends upwardly from the base and is screw threaded to receive a nut 40. The shank 39 is rotatable and slidable in the carrier 24 and aspring 41 positioned in a recess 42 in the carrier 24 bears against the nut at its 'upper end and against the bottom of the reeess 42 at its lower end, thus holding the sllde, consistmg of the shank 39 and b:

37, upwardly in the position illustrated in Fig. 1. A The base 37 is provided with a cam 43 which is held against a cam-shaped recess 44 in the carrier 24. The cam 48 consists of V-shaped projections which are integral with the base 37 and are positioned on diametrically opposite sides ofthe shank 39, so

I that when the slide is rotated about a vertical axis the cam projections 43 riding out of the recesses 44 provided in the under face of the carrier 24 will move the slide 25 downwardly as a whole, compressing the spring 41. When this happens a pair of levers 45 and 46, which are pivoted at 47 upon the base 37, will be rocked upon their pivot by a spring 48 interposed between the upper ends the levers 45 and 46 and thus cause the lower ends of the-levers, which constitute jaws 49 and 50, to move toward each other and thus release the last 51, so that it can be removed from the jaws 49 and 50.- In order to grip the last securely, the jaws 49 and 50 are ser rated at 52 and 53 and project downwardly into the slot 38 of the base37.

The upper ends of the levers and 46 are bevelled at 54 and 55 respectively formriding-against the surface 61 the recess 59. The last and base 3! are then rotated until. the cam-shaped pro ections 43 ing cam-shaped surfaces which engage like cam shaped or bevelled surfaces 56 and 51 on the slde wall 58 of a recess. 59 provided in the lower side of the carrier 24 and into which recess the upper portion 60 oitIthe base 37 projects. 7 p

The general operation of the lasting jack is as follows :The last 51 is forced on to the aws 49 and 50 when the aws have been moved toward each other by the spring 48, as hereinbefore described. At this time the cam-shaped projections 43 on the base 37 are atthe top of snap into the cam-shaped recesses 44 on the carrier, by reason of theaction of the spring 41 whlch moves the sllde 25 upwardly. As the slide 25 moves upwardly the bevelled dipper endsof' the levers 45 and 46 engage the bevelled inner surf-races 54 and 55 on can be rotated into any desired position aboutthe ditferent axes of rotation provided in the lasting jack, and it may be locked against rotation about the axis of 26 by the latch 30.

It will be understood that by rotating the last and the jaws 49 and 50, together with the slide 25, consisting of the base 37 and shank 39, the jaws may be operated to grip or to release the last according to the direction in which the last is rotated.

lVc claim:

1. A last holder for a lasting jack having, in combination, a carrier, inpositely disposed jaws rotatably mounted on said carrier, and means to move said jaws relatively to each other due to the relative rotation of said carrier and jaws, whereby a last may be gripped or released by said jaws.

2. A last holder for a lasting jack having, in combination, a *arricr, oppositely disposed jaws rotatably mounted on said carrier, and means to move said jaws away from each other due to the rotation of said jaws on said carrier in one direction and toward each other when rotated on said carrier in the opposite direction, whereby a last may be gripped or released by said aws.

3. A last holder for a lasting jack having, in combination, a carrier, a slide comprising a shank rotatably mounted on said carrier and a base fixed relativel to said shank with a cam-shaped surface t lereon bearing against a cam-shaped. surface on said carrier, and a spring in said carrier holding said cam-shaped surfaces in contact, and a pair of jaws pivoted to the base and positioned in a slot provided therein, and means to more said jaws relatively to each other when the slide is rotated on the carrier, whereby a last may be gripped or released by said jaws.

4. A last holder for a lasting jack having, in combination, a carrier, a slide comprising a shank rotatably mounted on said carrier and a base fixed relatively to said shank with a cam-shaped surface thereon hearing against a cam-shaped surface on said carrier and a spring in said carrier holding said cam-shaped surfaces in contact, a pair of levers constituting jaws pivoted to the base and positioned in a slot provided therein, and means to move said jaws toward each other when the slide is rotated in one direction and away from each other when the slide is rotated in the opposite direction.

5; A last holder for a lasting jack having, in combination, a pair of vertical and oppositely disposed levers, a vertical slide, a pivot on said slide to which said lovers are pivoted, the lower portions of said levers constituting jaws, the upper ends of said levers extending above said pivot, a. carrier upon which said slide is slidahly and rotatably mounted, and means to cause said levers to rock upon their pivot to move said jaws relatively to each other when the slide is rotated upon the carrier.

6. A last holder for a lasting jack having, in combination, a pair of vertical and oppositely disposed levers, a vertical slide, a pivot on said slide to which said levers are pivoted, the lower portions of said levers constituting jaws, the upper ends of said levers extending above said pivot, a carrier upon which said slide is slidably and retatably mounted, and means to cause said levers to rock upon their pivot to move said jaws away from each other when the slide is rotated in one direction and toward each other when the slide is rotated in the opposite direction.

7. A last holder for. a lasting jack having, in combination, a pair of vertical and oppositely disposed levers, a vertical slide, a pivot on said slide to which said levers are pivoted, the lower portions of said levers constituting jaws, the upper ends of said levers extending above said pivot, a carrier upon which said slide is slidably and rotatably mounted, and means to cause said levers to rock upon their pivot to move said jaws relatively to each other when the slide is moved longitudinally thereof.

8. A last holder for a lasting jack having, in combination, a pair of vertical and oppo-' sitely disposed levers, a vertical slide, a pivot on. said slide to which said levers are pivoted, the lower POh'dO'flS of said levers constituting jaws, the upper ends of said levers extending above said pivot, a carrier upon. which said slide is slidably and rotatably mounted, and means to cause said levers to rock upon their pivot to move said jaws away from each other when the slide is moved longitudinally thereof in one direction and toward each other when the slide is moved longitudinally thereof in the opposite direction.

9. A last holder for a lasting jack having, .in combination, a pair of vertical andoppositely disposed levers, a vertical slide, a pivot on said slide to which said levers are pivoted, the lower portions of said levers constituting jaws, the upper ends of said levers extending above said pivot, a carrier up on which said slide is slidably and rotatably mounted, means to cause said levers to rock upon their pivot to move said jaws away from each other when the slide is moved longitudinally thereof in one direction and toward each other when the slide is moved longitudinally thereof in the opposite direction, and means to move said slide longitudinally thereof when it is rotated upon the carrier.

10. A last holder for a lasting jack having, in combination, a pair of vertical and oppositely disposed levers, a vertical slide, a pivot on said slide to which said levers are pivoted, the lower portions of said levers constituting jaws, the upper ends of said. levers extending above said pivot, a carrier upon which said slide is slidably and retatably mounted, a spring to cause said aws to move toward each other when. the slide is moved longitudinally thereof in one direction, and a cam on said carrier to move said jaws apart when the slide is moved longitudinally thereof in the opposite direction.

11. A last holder for a lasting jack having, in combination, a pair of vertical and oppositely disposed levers, a vertical slide, a pivot on said slide to which said levers are pivoted, the lower portions of said levers constituting jaws, the upper ends of said levers extending above said pivot, a carrier upon which said slide is slidably and rotatably mounted, a spring to cause said jaws to move toward each other when the slide is moved longitudinally thereof in one direction, a cam on said carrier to move said jaws apart when the slide is moved longitudinally thereof in the opposite direction, and means to move said slide longitiulinally thereof when it is rotated upon the carrier.

12. A last holder for a lasting jack having, in combination, a pair of vertical and oppositely disposed levers, a vertical slide, a pivot on said slide to which said levers are pivoted, the lower portions of said levers constituting jaws, the upper ends of said levers extending above said pivots, a carrier upon which said slide is slidably and rotatably mounted, a spring to cause said jaws to move toward each. other when the slide is moved longitudinally thereof in one direction, a cam on said carrier to move said jaws apart when the slide is moved longitudinally thereof in the opposite direction, a spring to move said slide in one direction, and a cam to move the slide longitudinally thereof in the opposite direction when the slide is rotated upon the carrier.

13. A lasting jack having, in combination, a last holder embodying a carrier, oppositely disposed pivotally mounted jaws rotatably mounted. 011 said carrier, and means fixed relatively to said carrier and adapted to be engaged by said. jaws when they are rotated on said carrier whereby said jaws may be roclred upon their pivots.

14. A last holder for a lasting jack having, in combination, a carrier, oppositely disposed pivotally mounted jaws rotatably mounted on said carrier, means fixed relatively to said carrier and adapted to be engaged by said jaws when they are rotated on said carrier, whereby a last may be gripped or released by said jaws, a connecting memberupon which said carrier is ro-- tatably mounted, means to lock said carrier against rotation thereon, and a bracket upon which said connecting member is rotatably mounted.

15. A last holder for a lasting jack having, in combination, a carrier, oppositely disposed jaws rotatabiy mounted on said carrier, means to move said jaws relatively to each other when they are rotated on said 7 #5 carrier, whereby a last may be gripped or released by said jaws, a connecting member upon Which said carrier is rotatably mounted, means to lock said carrier agamst

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