US2953846A - Drawing device - Google Patents

Description

Sept. 27, 1960 D. A. WAGNER DRAWING DEVICE Filed Nov. 18, 1957 INVENTOR. v Dewey Ii. Wayrzer United States Patent 2,953,846 1. GDEY CEFI; 'i

Dew ey A. Wagner, 1604 Garrard'St Covington,

Filed Nov. 18, 1957, Set. No.'697,054 loam.- 01 29 -5261 This invention relates to improvements in drawing,

tools for axially pulling wheel's, gears, handlesand bea'r quiredwhich proved to be a disadvantage in that a gen eral machine shop or a repairman had to carry a widevariety of drawing devices.

The invention aims to overcome the above disadvantages of the presently used drawing tools by providing a tool which is capable of pulling-all types of axially removable devices frozen to their respective shafts which by a simple operation is convertible for use in a largenumber of mechanical situations. I

It is a further object of the invention to provide a con vertible drawing tool which is of simple, rugged and inexpensive construction which ischaracteri'zed by thoroughly dependable operation. i

Other objects of the inventlon will become apparentfrom the following specifications taken in conjunction with'the drawings which illustrate a preferred ment thereof.

l In the .drawings:

'Fig. 1 is a longitudinal sectional view taken through;

the center of my drawing tool.

Fig. 2 is a view taken on line '2--'z of'FigQl. Fig. 3 is a fragmental, topplan view of the tool as shown in Fig. 1. t

' Fig. 4 is a section taken on line 4- of Fig.

Referring to the drawings, the power screw threaded member for my drawing device is indicated by the reference numeral 6, said member including an elongated threaded shank 7 that is provided at its lower terminal end with an inverted cone shaped, work engaging portion 8. An operating handle 9 is fixed to the upper end of the screw threaded member 6 and is adapted to be manually turned to provide corresponding rotary movement of the power screw threaded member around its longitudinal axis. A first member 10 is threaded to the upper end of the screw threaded member 6 adjacent its handle 9 and comprises a central hub 11 having an exter na-lly threaded, flange 12 projecting upwardly therefrom. An internally threaded bore 13 is formed through the hub 11 and the flange 12 which cooperates with the threads on the member '6 so that upon rotation of the handle 9 of the member the first member 10 will have longitudinal relative movement on the said member 6. A pair of opposed draft arms 1414 (Fig. 2) extend from the hub 11 and as indicated in Figs. :1 and 3 a pair of opposed guide arms 15-15 also extend from the hub at right angles to the draft arms 1414.

A second member 16 is also mounted on the screw threaded member 6 below the first member 10 and has 5 a pair of draft arms .1717 extending in opposite direc tions from a central portion 18, said second'member having its longitudinal axis lying in the common plane of the'axis of the screw threaded member 6 and the longitudirial axis of the. guide arm-15-15 of the fi'rstmember r 10. As best shown in Figs. 1 and 4 the central portion n of the second member 16has anopening 19therethrough for freely receiving the lower portion of the screw threaded member adjacent its terminal end 8. As shown' especially in Fig. 4 a laterally extending, rectangular shaped opening 20 is formed through the central portion 18 of the second member 16 and intersects and is slightly wider than the central opening 19 in said member which freely'receives the screw threaded member 6. Slidably mounted in this opening20 for lateral movement is a block 21 that has formed therein (Fig. 4) a threaded aperture 22 for cooperative engagement with the screw threaded member 6, an enlarged aperture 23 for freely receiving the screw threaded member 6, and an intermediately positioned seat 24 for engaging the terminal end 8 ofsaid screw threaded member 6. The block has limited lateral movement in the opening 20 by means of an elongated slot 25 formed in the block for receiving the end of the screw 26 threaded in the central portion of the second member and having its inner end extending into the said slot 25.

It will, therefore, be understood that the screw threaded member 6 may have cooperative engagement with the threaded aperture 22 whereby upon. rotation of the said member the second member will move longitudinally of the threaded member, or the enlarged aperture 23 may be slidably moved into registry with the screw threaded member whereby the block and the second member 16 may be freely moved longitudinally of the screw threaded member, Also the second member may be used as a base for the screw threaded member by moving the seat 24 into 1'? tal displacement of the second member 16 with respect registry with the terminal end 8 of the screw threaded, member whereby the threaded member will have a rotary bearing in the block 21.

Each of the draft arms 1717 ofthe second member 16 have threaded into their intermediate upper ends a guide rod 25-25 which extend through openings 26- 26 formed'through the oppositely' extending guide arms 1 15'-15 of the first member 10. These guide rods have heads 2727 at their outer ends'for preventing accidento the first member, ibut permittin-g relative longitudinal movement between the first and second members up to' the longitudinal extension of the guide rods 25-25 from the second member 16.

The draft arms 17-17 of the second member and the draft arms 14--1'4 of the first member 10 are each provided with a row of laterally spaced apart, vertically extending openings 28 for detachably receiving the upper ends of pull fingers 29, said fingers being of a variety of lengths and preferably having the work engaging terminal ends in the form of inturned gripping portions 30 extending at right angles from the fingers 29. The upper ends of the fingers are detachably and pivotally' secured to their respective arms by means of pins 31 provided with knurled heads 32 for axially inserting and withdrawing said pins from aligned holes formed through the members on opposite sides of the apertures 28, said pins being passed through holes formed in the upper ends of the fingers 29. As shown in Fig. 1 the upper ends of the fingers 29 are tapered downwardly and inward-1y at 33, said tapered ends being in engagement with a finger adjustment bar 34 extending across the top of the first member and having a central aperture 35 formed therein for freely receiving an externally threaded flange 36 projecting upwardly from the central portion 18 of the second member 16. The bar is constantly urged toward engagement with the upper ends of the fingers by means of expansile springs 37 encircling the lower ends of the guide rods 2525 and bearing at their upper ends against shoulders 26 formed integrally on the guide rods 25. -It

will, therefore, be noted that the lower ends of the fingers, 29 will be continuously urged inwardly toward their. work engaging positions by the spring pressed bar 34 and after the fingers have been engaged on the work they may be held in said positions by turning down. on a wing nut 38 threaded to the flange of the second member. As best shown in Figs. 2 and 3 the fingers 29 are adjustably and pivotally mounted to the draft arms 14-14' of the first member in a manner similar to that shown for mounting said fingers on the second member, described herebefore, it being noted that a finger adjustment bar 39 has a central aperture 40 therethrough for freely receiving the externally threaded flange 12' on the first member and that the said bar is positively held down upon the upper ends of the fingers by means of a wing nut 410 threaded to the flange 12. The bars are continuously urged toward the fingers by means of bolts 42 threaded in the draft arms 14-14 and having their intermediate end portions passing through apertures in the bar, springs 41 being interposed between the heads of the bolts 42 and the bar for biasing the bar toward engagement with the upper tapered ends 33 of the fingers 29.

From the foregoing it will be understood that the drawing tool of this invention can be utilized for pulling a great variety of frozen wheels, gears, and roller bearings, from their respective shaft. A few exemplary applications for my drawing device will now be described so that this invention and its uses will be understood. When it is required to pull a frozen valve handle from a valve stem with my tool it is only necessary to register the threaded opening 22 in the slide block 21 with the screw threaded member 6, tum the threaded member into the aperture 22 until the terminal end 8 is in engagement with the center of the valve shaft then by engaging the terminal ends 30 of the fingers 29 underneath the valve handle and turning up on the screw threaded member 6 the draft arm and the fingers will move longitudinally away from the terminal end and the handle will be pulled axially from the stem. The same type of handle pulling operation can be accomplished with the fingers 29 on the first member in certain other valve handle and stem operations by registering the opening 23 in the block 21 with the screw threaded member -6. In the event it is necessary to pull a wheel from a piece of work having an enlarged opening the slide block 21 is moved so that the terminal end 8 of the screw threaded member is rotatably engaged in the seat 24 in the block. In this position the second member will form a stand that may be extended across the enlarged opening whilst the fingers 29 on the first member can be engaged with the work. Upon turning up on the screw threaded member 6 the wheel may be pulled axially from the piece of work having an enlarged opening therein.

In certain other mechanical situations, as indicated by dotted line 130 in Fig. 1, a U-shaped standard can be substituted for the pair of pull fingers 29-29 on the second draft member 16. When the standard is used it is engaged on a fixedobject and the pull fingers 29--29 in the first draft member are engaged on the object frozen on the fixed object. By turning up on the screw threaded member said first member will move away from the standard and exert an axial pullon the frozen object sufficient to remove the latter from the fixed object.

It will now, therefore, be apparent that I have provided a device that will in actual practice apply a pulling stress, radially outwardly from a number of fixed objects to free frozen parts from said objects and while I have herein shown and described one specific form and a few uses of. my invention I do not wish to be limited thereto except for such limitations as may appear in the appended claim.

What I claim is:

A device of the character described, comprising a screw threaded member having a handle on its upper end and a lower reduced end, a first draft member disposed at right angles to the screw threaded member and having an internally threaded bore formed through its central portion for threadedly engaging the upper portion of said screw threaded member, a second draft member disposed at right angles to the screw threaded member and havinga central. opening therethrough in axial alignment with the screw threaded member, a lateral, open ended slot formed in the second draft member intersecting the central opening therein, a block positioned in the slot for lateral sliding movement and having a seat therein for.

rotatably receiving the lower reduced end of the screw threaded member, a stand depending from the second draft member, a pair of draft fingers each pivotally mounted. on, and depending from an end of the first draft member, said fingers having work engaging terminal ends formed thereon, and guide means mounted on one of the draft members in parallelism with the screw threaded member andhaving a sliding connection with the other draft member.

References Cited in the file of this patent UNITED STATES PATENTS 1,305,322 Towler June 3, 1919 2,136,004 Cornwell Nov. 8, 1938 2,298,408 Moyer Oct. 13,.1942 2,681,501 Schrem June 22, 1954

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