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Publication numberUS1740934 A
Publication typeGrant
Publication dateDec 24, 1929
Filing dateDec 30, 1926
Priority dateDec 30, 1926
Publication numberUS 1740934 A, US 1740934A, US-A-1740934, US1740934 A, US1740934A
InventorsRaymond Ralph Leslie
Original AssigneeDominion Wood Heel Corp Ltd
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Air jack for wood-heel-turning machines and the like
US 1740934 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Dec. 24, 1929. RAYMOND 1,740,934

AIR JACK FOR WOOD HEEL TURNING MACHINES AND THE LIKE 1 Filed Dec. 30, 1926 2 Sheets-Sheet l 9 M? 111mMI I! I 915 All 12 2018 Attorneys 24, 1929. RAYMOND 1,740,934


The present invention relates primarily to an air jack for wood heel turning machines and further to novel adjusting means for the clamping jaws of the jack. It is illustrated as embodied in a jack of the general type shown in United States Letters Patent No. 1,488,534, granted April 1, 1924, on the application of Folsom, Vinton & Whitne Tn accordance with a feature of the invention the illustrated ack base is provided with guide ribs at its side, and a pair of racks are slidably mounted to slide along the guide ribs and to support the upper jaw of the heel blank gripping device. By means of the slidability of the racks with reference to the base, and a toothed locking device carried by the base, the racks may be locked in any desired adjustment for the purpose of regulating the spacing between the two jaws.

The air jack provided by the invention comprises, as herein illustrated, mechanism associated with the jack head for applying pressure on the upper heel blank clamping jaw and thereby clamping the heel blank between the two aws during the cutting operation. The illustrated head is formed with a tapered recess in which is slidably mounted a wedge. The lower surface of the wedge so engages the top of a vertical slidable pm mounted in the head and bearing upon the upper jaw. A fluid control device consisting of a cylinder and piston is provided for shifting the wedge in the recess in order to apply pressure on the upper jaw or to release the pressure thereon to permit removal of a finished heel and insertion of a new block. More specifically, the illustrated piston is connected to the wedge by a rod, so that the movement of the piston by an appropriate valve mechanism actuates the wedge in a corresponding manner.

The invention is fully disclosed in the following description and in the accompanying drawings in which:

Figure 1 is a vertical section of the device, partly in elevation;

Figure 2 is a section on the line 2-2 of Figure 1;

Figure 3 is a detail section similar to Figure 1, showing a difierent position of the parts;

Figure 4c is a plan section on the line 44 of Figure 3;

Figure 5 is an elevation of the valve plug;

Figure 6 is another elevation of the plug in a diii'erent position;

Figure 7 is an end or face view of the plug;

Figure 8 is an elevation, partly in section, of the valve casing, showing the valve plug mounted therein; and

Figure 9 is a section on the line 9-9 of Figure 8.

Reference to these views will now be made by use of like characters which are employed to designate corresponding parts throughout.

The stem 1 is mounted to move in an arcuate path in the manner described in connection with the complete machine which is already known in the art and described, with certain improvements, in Canadian application No. 3102M, filed January 25th, 1926. The top of the stem carries a bracket 2 in which a jack base 3 is mounted on a horizontal pivot 4. The upper face 5 of the base 3 is inclined and has its lower portion 6 toothed for a purpose which will presently appear. On this face is slidably mounted a gauge block 7 which may be clamped in any desired position on the face 5, by means of a bolt and nut device indicated by the numeral 8.

An intermediate portion of the base 3, near the rear or inner end thereof, is formed with a pair of ribs 9 and is then continued rearwardly as at 10 as illustrated in Figure 2. The slides of the end 10 are engaged by rack members 11 which are joined at their upper ends by a head 12. The racks are slidable with reference to the end 10 and are penetrated by a bolt 13 which moves in a slot 14 cut-through the end 10 and having suflicient length for adjustment purposes.

The extremity of the base 3, adjacent the rear portion 10, is in the form of an enlargement 15 of such width as to cover the teeth of the racks 11. A recess 16 is cut in the rear rib for the purpose of accommodating a toothed fork 17 provided to engage the teeth of the racks 11. The fork 17 is secured to the frame portion by means of a bolt 18.

In this region the portion 10 is reduced in length to provide a cavity 19 within the 5 fork for the purpose of accommodating a spring 20.

Abovethe face 5, the racks ll-supportan upper clamp plate 21 held between them by .a pivot pin 21. The lower face of the plate is recessed as at 22 for accommodating in a slidable manner a clamp jaw 23 which is fixed in desiredposition by a bolt and nut device 24. When it is desired to obtain an alteration in the space between the jaws 6 and 23, the screws 13 and 18, having the *heads 13 and 18are loosened. On loosening of the screw 18, the spring in the recess '19 acts to move the toothed fork 17 out of engagement with the racks 11. v The racks together with the'head 12 may now be moved 1 up or down, this motion being permitted by the slot 14 which accommodates the bolt 13 and further by the disengagement of the parts lland 17. 'When the new adjustment has 25 been 'found, the screws 13 and 18 are tightened.

*The front end of the gauge 7 receives a screw 25, the shank 26 of which is passed between the racks 11. The head of the shank comprises aknurled knob 27 and a finely graduated disc or'scale 28 cooperating with an index arrow 29 inscribed on a side of the enlargement 15. This device provides for adjustment of the gage block 7, after which '35'the adjustment is held by the bolt and nut device 8 already mentioned.

-Atfthe lower end of the enlargement15 is securedan operating handle 30 by means of which the base 3 and associated parts are chine the heel-blank 31 clamped between the jaws 6and 23.

"The'head 12'is formed'with a tapered recess'32, and to the end of the head at the larger end of the recess is secured a cylinder 33. The cylinder contains a piston 34 from which-extends a rod 35 into the recess 32 where it carries a wedge 36 having substan- Be- "tially the same angularity as the recess. low the recess, a pressure pin 37 is vertically and 'slidably mounted in the head 12 and is adapted to bear upon a ball 38 received'in the top of the clamp plate 21. Above the recess thehead 12 supports a stem 39 and a steadying handle 40 which is held by the left hand :of the operator while his. right hand .holds the handle 30.

A valve mechanism, described in detail below,'is provided for controlling a flow of air to'opposite ends of the cylinder so that the piston 34 and consequently the wedge 36 may becontrolled in theirmovement. The wedge '36 isofa'small angle so that it will not slip towards the cylinder 33 under the opposite-pressures acting on the-base and infurther formed-with a recess 47.

-'4953. The inner ends of the ducts 58 and swung to present to the cutters of the ma- .a conical valve plug 42 from the apex of which extends a stem 43. tothe exteriorv of the casing where it is providedwith an operating handle 44. The valve plug' is obviously inserted in the housing through-an open end thereof which is then closed by a cap 45.

:Theinnerface. of the cap is, however, spaced as at 46 from the face of the plug which is From the base of this recess a feed duct-48 is drilled for=ashort distance towards the apex and then is continued as a short duct 49 towards the surface of the plug. :Inthe same plane as the duct'49 are formedfour substantially radial interconnected ducts 50, 51, 52and 53 extending from: the centre towards the surface of the plug, but not connected to the duct 49.

The cylinder 33 9) is formed with a pair of inclined'ducts 54 and 55 spaced radial- .ly with reference to the cylinderchamber and communicating with longitudinal passages 56 and 57 respectivelyleadingto the plane of the ducts 4953. Finally, a pair of converging ducts 58 and 59-lead from the passages 56 and'57 respectively through the top of the casing 41 to the plane of the ducts -59 areso spaced that they may communicate with either the ducts 49 and 51 or the ducts 50and49, bringing either the duct 53 or the duct 52 in line with an exhaust port 60. Air under pressure is supplied to the space-46- and recess 47 through an inlet port 62 threaded asat 63 at its outer end forreceiving the a1r pipe.

It will be-apparentthat when the ducts 49 and 51 communicatewith the ducts 58 and 59, as shown in Fig. 9, the duct 53 will register with-the outlet port 60 so that one side of the piston will be fed with the pressure fluid while the other side will be exhausted. If the valve plug is turned to bring the ducts 50 and 49 into communication.with'the ducts 58 and 59, the duct 52 will register with the outlet port 60 and the conditions'in the cylinder will be reversed.

Due to'the control of the wedge 36 in this manner, the upper clamp jaw 23is released after each cutting operation to venable removal of thefinished heelblankand the insertion of an untreatedheel blank. A- spring 64securedto the top of the clamp plate 21 and engaging the bottom of'the head 12 causes the plate andthe jaw 23'to tilt upwardly as soon as the pressure on the pin 37 is r'e'lieved,

-.-as illustrated iii-Figure 3. The loweraedge ofthe jack base 3 carries a roller 65 which rides on a track in the usual manner.

While a specific embodiment of the invention has been illustrated and described, it is to be understood that various alterations in the details of construction may be made without departing from the spirit of the invention as indicated by the appended claims.

Having thus fully described the invention, what I claim as new and desire to protect by Letters Patent is 1. In a wood heel turning machine, a jack base, a gripping jaw formed thereon, a head mounted above said base, connecting means between said head and base whereby the head is supported by the base, another jaw pivotally supported by said connecting means and disposed above the first named jaw, a pin slidably and vertically mounted in said head and adapted to bear upon said upper jaw, said head having a tapered recess, a wedge slidable in said recess and engaging the upper end of said pin, a cylinder secured adj acent said head, a rod extending from said wedge into said cylinder, a piston mounted within said cylinder and secured to said rod, and valve mechanism for controlling supply and exhaust of pressure fluid to said cylinder at opposite sides of said piston.

2. In a jack for a wood heel turning machine, a base having a gripping jaw thereon, parallel guide ribs mounted on the base, a head having arms arranged to slide along the guide ribs, rack teeth on the arms, a toothed fork detachably mounted on the base and arranged to engage the rack teeth and clamp the arms against the guide ribs, and a second gripping jaw mounted on the head.

In witness whereof I have hereunto set my hand.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2716911 *Oct 1, 1954Sep 6, 1955Focke Gustavus KOpen-center vise
US2939350 *Aug 23, 1954Jun 7, 1960Gen Motors CorpMetal working
US3802688 *Jun 15, 1972Apr 9, 1974Traub GmbhWork piece holding device
US4951932 *Sep 15, 1989Aug 28, 1990Thomas Jim RAdjustment mechanism for work clamping
U.S. Classification144/278.1, 269/234, 269/239, 269/151, 409/903, 269/210, 12/123.3
International ClassificationB27M3/20
Cooperative ClassificationY10S409/903, B27M3/20
European ClassificationB27M3/20