US3372457A - Spring action drawing device - Google Patents

Description

March 12, 1968 Filed 001:. 4, 1965 R. L. SELBY ET AL.

SPRING ACTION DRAWING DEVICE 4 Sheets-Sheet 1 INVENTORS RICHARD L. SELBY ROBERT D SELBY A TORNE Y FIG.

March 12, 1968 R. SELBY E T AL 3,372,457

SPRING ACTION DRAWING DEVICE Filed Oct. 4, 1965 lNVE/VTORS RICHARD L. SELBY ROBERT D SELBY ATTORNEY 4 Sheets-Sheet 2 March 12, 1968 Filed Oct. 4, 1965 R. L. SELBY ET AL SPRING ACTION DRAWING DEVICE 4 Sheets-Sheet 5 FIG. 3

INVENTORS RICHARD L. SELBY ROBERT D' SELBY A r TOR/V5 Y March 12, 1968 R. L. SELBY ET AL 3,372,457

SPRING ACTION DRAWING DEVICE Filed Oct. 4, 1965 4 Sheets-Sheet 4 INVENTORS RICHARD L. SELBY ROBERT D .SELBY United States Patent Office 3,372,457 SPRING ACTION DRAWING DEVICE Richard L. Selby and Robert D. Selby, Flint, Mich, as-

signors of thirty-three and one-third percent to Harold Selby, Flint, Mich.

Filed Oct. 4, 1965, Ser. No. 492,602 3 Claims. (Cl. 29259) ABSTRACT OF THE DISCLOSURE A drawing device including at least two arms adjustably supported upon a frame member and bearing feet adapted to embrace a workpiece which is to be removed from a shaft. A handle extends from the frame member to assist in engaging the device with the workpiece, and a drivescrew extends freely through the frame member parallel to said arms and is arranged to contact axially the end of the shaft from which the workpiece is to be removed. A pair of guide pins extend slidingly through bores in the frame member, and are arranged to retain the pressure plates, and they support thereon, respectively, a pair of compression springs intermediate the frame member and the lower pressure plate, to yieldingly urge the frame member and arms in a direction opposite to the forward end of the drivescrew.

The present invention relates generally to drawing devices and more particularly to a spring-loaded, adjustable drawing device having a drivescrew and work-engaging members parallel thereto for pulling wheels, gears, handles, bearings, or the like axially from their respective shafts.

Heretofore, drawing devices have been adapted to accommodate only particular workpieces, and have been required to be manually supported by the repairman while engaging such workpieces. This has proven to be disadvantageous in that a wide variety of such devices have been required to be kept on hand in the repair shop and the repairman has been required, while using such devices, to devote a substantial portion of his strength and attention to manually holding the device in engage ment with the workpiece instead of drawing the workpiece from its shaft.

It is accordingly an object of the invention to provide an improved drawing device for removing a wide variety of wheels, gears, handles, bearings, and like workpieces from their respective shafts.

Another object of the invention is to provide an improved drawing device adapted to be self-supported upon 1 a workpiece which is to be pulled thereby from a shaft.

A further object of the invention is to provide in a drawing device spring means arrangeable to support the device in engagement with a shafted workpiece and to urge the workpiece to be drawn from its shaft.

part of-the specification in which like characters are employed to designate like parts throughout the same, and wherein? I FIGURE 1 is a side elevation of a preferred embodiment of the invention partially in section;

FIGURE 2 is a perspective View of the preferred em- I bodiment of the invention self-supported in position for drawing a wheel from a shaft;

FIGURE 3 is a view similar to FIGURE 2 but showing additional drawing force applied to the workpiece and shaft; and

3,372,457 Patented Mar. 12, 1968 FIGURE 4 is a perspective view of a modified form of the invention.

Referring now more particularly to the drawings, we provide a preferably hollow metal frame member 10 having a bore 11 extending vertically through the midpoint thereof and a pair of additional bores 12, 12 also extending vertically through the frame member and equally spaced on opposite sides of bore 11. A handle 14 extends from one side of frame member 10. A pair of arms -16, 16, preferably of triangular cross-section for increased strength, are slidingly supported by collars 17, 17 upon frame member 10 and bear a pair of mutually opposing, inturned feet 18, 18 at their respective lower ends. A pair of horizontal bores 20, 20 are preferably provided near the extreme ends of frame member 10 to receive conventional cotter pins (not shown) or the like, if desired, for retaining arms 16, 16 against accidental removal from the frame member.

An upper pressure plate 24 and a substantially identical lower pressure plate 26 are provided, each of which bears a pair of vertical apertures 27, 27 near the outer ends thereof and a threaded aperture 28 extending vertically through the center thereof. Apertures 27, 27 of each pressure plate 24 and 26 are arranged to be in alignment with bores '12, 12 when apertures 28, 28 are in alignment with bore 11.

A threaded drivescrew 30, hearing a preferably hexagonal head 32 thereon and having a sliding rod or handle 33 extending transversely therethrough, extends downward freely through bore 11 of frame member 10 and threadably engages the threaded central apertures 28, 28 of pressure plates 24 and 26, and supports the pressure plates on opposite sides of the frame member in mutually spaced relationship with each other.

A pair of guide pins 34, 34 extend vertically through bores 12, 12 of frame member 10 and apertures 27, 27 of pressure plates 24 and 26, and are retained, and in turn retain the pressure plates, by cotter pins 36 extending transversely through the remote ends of the guide pins. A pair of helical compression springs 38, 38 surround guicle pins 34, 34 between frame member 10 and lower pressure plate 26, and yieldingly urge the frame member in a direction away from the lower pressure plate. it should be particularly noted that drivescrew 30 is not threadably engaged with frame member 10 but, instead, is threadably engaged with pressure plates 24 and 26, and that the drivescrew and stabilizer pins 34, 34 extend freely through bores 11 and '12, 12 in the frame member.

To engage the device, the repairman holds it in one hand by its handle 14 and places feet 18 behind the workpiece, such as a wheel 40, which it is desired to remove from a supporting member, such as a shaft 42, by sliding arms 16 inward upon frame member 10. With his other hand the repairman rotates handle 33, or engages and rotates head 32 with a suitable wrench, to rotate drivescrew 30 and move it threadably forward through pressure plates 24 and 26 until the forward end 44 of the screw contacts the near end of the shaft 42. An additional turn or two of drivescrew 30 draws pressure plates 24 and 26 rearwardly upon the drivescrew and compresses springs 38, 38 sufiiciently to cause them to yieldingly urge frame member 10, arms 16, 16, and feet 18, 18 rearwardly and hence to apply rearward pressure upon the workpiece, forcing the near endof shaft 42 against the forward end 44 of the drivescrew, thus causing the device to grasp and be self-supported upon the workpiece. The repairman then need no longer manually support the device. 7

To apply such additional force as is necessary to remove wheel 40 from shaft 42, the repairman turns drivescrew 30 still further, using both hands if necessary, further compressing springs 38, 38 are placing additional, rearwardly-directed spring pressure upon frame member 10, which is transmitted through arms '16, 16 and feet 18, 18 to wheel 40 while end 44 of the drivescrew is braced against the near end of shaft 42. The pulling force thus exerted upon wheel 40 urges it to be withdrawn axially from shaft 42, as best shown in FIGURE 3. It will be noted that support member is free to move rearward upon drivescrew under urging from springs 38, 38 since bore 11 is not threaded and permits the drivescrew to slide freely therethrough. Similarly, guide pins 34, 34 are free to slide rearwardly through bores 12, 12 in support member 10, thus permitting compression of springs 38, 38.

If the pressure of springs 38, 38 is not sufficient to draw wheel 40 from its shaft 42, further rotation of drivescrew 30 when the springs are fully compressed will exert still further rearward pressure directly through lower pressure plate 26, the completely compressed springs 38, 38, support member 10, arms 16, 16, and feet -18, 18, and direct forward pressure upon the near end of shaft 42, pulling the wheel from the shaft. Springs 38, 38, however, are selected to be of sufficient strength so that the wheel will ordinarily be pulled from the shaft by pressure of the springs before the springs are fully compressed.

It will thus be seen that we have provided an improved drawing device adapted to be self-supporting upon a workpiece and to remove a wide variety of workpieces from shafts or other supporting members in a manner which is convenient and easy for the repairman.

If desired, arms 16, 16, or feet 18, 18, or both, may be pivotally or rotatably arranged so as to engage workpieces having surfaces otherwise difficult to grasp. By sliding arms 16, 16 to appropriate positions upon support member 10, workpieces other than of circular shape may be more easily separated from supporting means other than centrally located shafts.

In a modified form of the invention shown in FIGURE 4 we provide frame member generally indicated at 46 and having three supporting arms 48, 48, 48 extending 120 apart, three arms 16, 16, 16 slidingly supported thereon and having inturned feet 18, 18, 18, three-armed upper and lower pressure plates 50 and 52, three guide pins 34, 34', 34, extending through three bores 12', 12', 12' in frame member 46, and three compression springs 38', 38', 38'. The operation of this modified form of the invention is similar to that of the preferred embodiment, but the third arm equally spaced from the other two arms enables the device to support independently the circular workpiece 40 when it has been removed from the shaft 42.

It is to be understood that the forms of the invention herewith shown and described are to be taken as preferred embodiments of the same and that resort may be had to various changes in construction without departing from the scope of the sub-joined claims.

What is claimed is:

1. A device for withdrawing a workpiece from a supporting member comprising:

a frame member;

at least two arms supported upon said frame and adapted to engage said workpiece;

a drivescrew extending freely through said frame member and adapted to contact said supporting member;

a pressure plate threadably engaged with said drivescrew; and

spring means intermediate said pressure plate and frame member and arranged to yieldingly urge said frame member and arms rearw ardly upon said drivescrew in response to rearward movement of said pressure plate when said screw is rotated.

2. A device for withdrawing a workpiece from a supporting member comprising:

a frame member having a central bore therethrough and a plurality of additional bores therethrough parallel to said central bore;

at least two arms supported upon said frame member and adapted to engage said workpiece;

an upper and a lower pressure plate disposed respectively on opposite sides of said frame member, each having a threaded aperture therein in alignment with said central bore in said frame;

a drivescrew extending slidably through said central bore, threadably engaged with said threaded apertures in said pressure plates, and adapted to contact said supporting member;

a plurality of guide pins extending between said pressure plates and slidably through said additional bores and arranged to retain said pressure plates; and

a plurality of compression springs surrounding said guide pins, respectively, intermediate said frame member and said lower pressure plate and disposed to yieldingly urge said frame member, arms and workpiece in a direction opposite from said pressure plate and supporting member when said arms engage said workpiece and said drivescrew is rotated in one direction.

3. A device for withdrawing a workpiece from a shaft comprising:

an elongated frame member having a central bore extending transversely therethrough and a pair of additional bores parallel to and equally spaced on opposite sides of said central bore;

a pair of arms slidably supported by collars upon opposite ends of said frame member and having inturned feet at the lower ends thereof adapted to engage said workpiece;

an upper pressure plate and a lower pressure plate arranged on opposite sides of said frame member, respectively, each having a pair of apertures therein in alignment with said additional bores in said frame member and a threaded central aperture therein in alignment with said central bore of said frame member;

a pair of guide pins extending through said aligned additional bores and apertures, respectively, and retained by cotter pins extending through the remote ends thereof;

a drivescrew, having a head at, and a handle near, one end thereof, extending slidably through said central bore in said frame member, threadably engaged with said central apertures in said pressure plates, and having its other end adapted to bear axially against said shaft; and

a pair of helical compression springs surrounding said guide pins, respectively, intermediate said frame member and the pressure plate nearest said other end of said drivescrew, and disposed to yieldingly urge said frame member, arms, and workpiece in a direction opposite from said shaft when said feet engage said workpiece and said drivescrew bears against said shaft and is rotated in one direction.

References Cited UNITED STATES PATENTS 1,372,350 3/1921 Hunn 29-259 X 1,522,141 1/1925 Raby 26949 1,778,802 10/ 1930 Howell 2926-2 1,783,649 12/ 1930 Howell 29263 FOREIGN PATENTS 649,857 10/1962 Canada. 440,111 4/ 1912 France.

MYRON C. KRUSE, Primary Examiner.

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