US2772525A - Drill grinder attachment - Google Patents

Description

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m.. 4, 1956 w. H. FowLER 2,772,525

DRILL GRINDER ATTACHMENT Filed Sept. 25, 1955 2 Sheets-Sheet l /58 T J4 40 fig/@@5020 /20 30 IN VEN TOR. w/f. lfm f1. fo w1. El?

Mn/MM @u 4L, T956 W. H. FOWLER DRILIS GRINDER ATTACHMENT 2 Sheets-Sheet 2 Filed Sept. 25, 1953 INVENTOR. WML/A17 Hncwl fw-MM United States Patent O DRILL GRINDER ATTACHMENT William H. Fowler, Elberton, Ga.

Application September 25,` 1953, Serial No. 382,399 z claims. (c1. s1`z19) This invention relates to improvements in means for facilitating the grinding `of drills of various lengths and diameters and has for a primary object to provide a portable drill grinding assembly which embodies a motor and grinding wheel mount and a tool support carried thereby, in substantially universally adjustable relation.

Another object of this invention is to provide a drill lsupport or rest that is adjustable about spaced horizontal axes and about a vertical axis to position a drill in conveniently selective positions relative to a grinding wheel.

A further object of this invention is to provide an improved chuck for holding a drill and to provide a cradle means for the chuck, the cradle means being so mounted in relation to the adjustable support and having means to positively support the chuck in reversed position so that a perfectly ground drill can be obtained.

These and ancillary Objects and structural features of merit are attained by this invention, the preferred embodiment of which is set forth in the following description and illustrated in the accompanying drawings wherein:

Figure 1 is a side elevational View of a support, constructed in accordance with this invention.

Figure 2 is a longitudinal horizontal sectional View taken on line 2-2 of Figure 1 and illustrating the novel chuck.

Figure 3 is a horizontal sectional view taken on line 3 3 of Figure l.

Figure 4 is a vertical sectional view taken on line 4-4 of Figure l.

Figure 5 is a longitudinal vertical sectional View taken 0n line 5-5 `of Figure 2.

Figure 6 is a cross-sectional View taken on line 6-6 of Figure 1.

Figure 7 is a cross-sectional view taken on line 7-7 of Figure l.

Figure 8 is a perspective View of the chuck cradle.

Figure 9 is a cross-sectional view taken on line 9-9 of Figure 5.

Figure 10 is an isomeric View of a drill grinding means and support.

Figure 1l is a top plan view of the drill grinding means and drill Isupport showing the same mounted in operative relation for grinding a drill.

Figure 12 is a longitudinal vertical sectional View taken on line 12-12 of Figure ll.

Referring now more particularly to the accompanying drawings and initially to Figures l0 and 11, the numeral 10 designates a flat base plate on which upstanding parallel plates 12 and 14 are xed. The plates 12 and 14 form a mount for a bearing clamp 16 which journals a grinding shaft 18 on the plates in a manner so that it is adjustable about a horizontal axis or axis paralleling the base plate. The shaft 18 extends from a motor 20, which has a handle 22 to move the shaft about its pivot and a grinding Wheel 24 is detachably circumposed on the other end of the shaft. An upstanding bolt 26 is provided on the base plate 10 alongside the plate 12 and serves to locate the adjustable tool support 28 on ICC the base plate 16 in the manner shown in Figure 11. In this respect, it will be noted that the plates 12 and 14 are mounted at 1an angle to the straight side and end edges of the rectangular base plate 10 so that the shaft 18 does not form a right angle with the underlying end edge but `is arranged obliquely thereto.

The tool support 28 includes an elongated at base plate 30 which is adapted to be fixedly superimposed on the base plate 10 so that its side edge 32 is flush with the side edge 34 `of the plate 10. The plate 30 has an axial slot 36 which receives the bolt 26 that has a nut 38 thereon to locate the plate 30 in axially :adjusted positions on the base plate 10.

A collar 40 is xed on the plate 30 and is formed with a circumferentially extending segmental slot 42. The collar 40 rotatably supports a standard 44 which has a radially extending threaded lug 46 fixed on its lower inserted end and extending through the slot 42. A wing nut 48 is threaded on the outer end of the lug 46 and bears against the outside of the collar 40 to lock the standard 44 in rotatably adjusted position in the collar 40. The slot 42 and lug 46 arrangement permits the standard 44 to be adjusted about an axis perpendicular to the base plate so as to effect the angular relationship shown in Figure ll and achieve the desired drill angle.

A pair of arms S0 and 52 are pivoted at diametrically aligned points on opposite 'sides of the standard 44 and are formed with offset parallel upper ends 54 and 56. The arms 50 and 52 are pivoted `on bolts 58 and 60 which extend radially from the standard 44. A web 62 connects the plates and is welded thereto so ras to embrace the back portion of the standard 44 at its upper end. The web 62 is arcuate and is formed on a radius complemental to the curvature of the standard 44. The web 62 has `an opening 64 for a bolt 66 which is threaded into an aligned opening 68 in the standard 44. A spring 70 is coiled on the bolt 66 and bears against the head 72 of the bolt 66 and the outer surface of the web 62. A threaded adjustment pin 74 having a handle 76 is threaded through a nut 78 affixed to the outer surface of the web 62 and aligned with the opening 80. The pin 74 bears against the standard 44, as shown in Figure 7 to adjust the : arms 50 and 52 about their pivots.

The upper ends 54 and 56 of the arm-s 50 and 52 pivotally support a chuck cradle 82. The sides 84 and 86 of the cradle are pivoted to the ends 54 and 56 by laterally extending pivot pins 88 and 90. The web 92 of .the cradle has a downwardly extending offset portion 94 at its rear end which connects a coplanar ilat extension 96 to the web. The extension is formed with a triangular aperture 98 for a purpose to be described.

The cradle 82, which is pivotable about sa horizontal axis, has its side 86 formed with a laterally projecting bolt 100, which projects through an arcuate slot 102 in the end 54 and a wing nut 104 is provided to lock the cradle 82 in adjusted positions.

The cradle 82 supports a drill chuck 106 which includes a shell 108 that is rectangular in cross section and has an enlarged rectangular rear end 110, the front 112 of the shell being deiined by converging portions 114 of the walls, the converging portions being spaced apart to provide an opening for the drill 116. Diverging portions 118 of the walls connect the enlarged end section 110 to the shell 108. A block 120 is fixed by screws 122 transversely in the end and has a threaded opening 124 to receive a tubular screw rod 126 which has a handle 128 on its outer end. An abutment 130 is formed on the inner end of the rod and bear against a pair of chuck jaws 132 and 134. The inner ends 136 of the jaws 132 and 134 are ared outwardly complemental to the diverging portions 118 and the outer ends 138 of the jaws 132 and 134 are tapered inwardly complemental to the converging portions 114 so that the jaws 132 and 134, as they are moved yforwardly in anaxial movement by the abutment 130 under rotation of the screw rod 126, cam against the diverging and converging portions and are moved together toclamp upon the drill 1116.

It will be noted that the shell 108 ts snugly between the sides 84 and 86 of the cradle 82 so that there is no side movement of the chuck 106. The end 110 sits on the extension and carries oppositely extending ears 140 and 142 which are provided to seat in the aperture 98 and locate the chuck 106 against axial movement in the cradle 82.

It can be seen that the tool support 28 can be adjusted forwardly and rearwardly on the base plate 10, can be adjusted about a vertical axis, perpendicular to the base plate, and. about aI horizontal axis at the pivots 58 and 60. The cradle 82 is thus adjusted by the support 28 and also the cradle can be` adjusted about its own horizontal axis. The chuck 11M-fits snugly in the cradle 82 and is located against lateral or axial movement. The desired drill angle can thus be easily achieved by the adjustment means. The chuck assembly can be lifted up out of the cradle andy turned over so that a perfectly ground drill is obtained.

It is believed that the operation and use of this device will be apparent to those skilled in the art from the drawings and variations may be made as come within the scope of the invention as dened by the appended claims.

Having described the invention, what is claimed as new is:

1. In a drill grinding means, a vertical standard, a support, means mounting the standard on the support for limited rotational movement, a cradle pivotally mounted on the standard, means pivoting said cradle at vertically spaced points for separate adjustment about verticallyI spaced horizontal axes, locking means associated with said last means, a drill chuck resting in said cradle and mea-ns locating the chuck againstmovement relative to the cradle, said cradle pivoting means including a pair of arms pivoted to the standard a member connecting the arms and embracing a portion 0f the standard, means carried by the standard and said member yieldingly resisting the pivotal movement of the arms and means for moving the arms. and member away from the standard in opposition, to said last means.

2. In a drill grinding means, a vertical standard, a support, means mounting the standard on the, support for limited rotational movement, a cradle pivotally mounted on the standard, means pivotingv saidV cradle at vertically spaced points for separate adjustment about vertically spaced horizontal axes, locking means associated with said last means, a drill chuck resting in said cradle and means locating the chuck against movement relative to the cradle, said cradle pivoting means including a pair of arms pivoted to the standardv andv extending thereabove, means holding the arms in selected positions, said cradle being pivoted between the upper ends of the arms above the standard and means for locking the cradle in adjusted position between the arms.

References Cited in the le of this patent UNITED STATES PATENTS 748,651 Reimann Jan. 5, 1904 1,576,311 Des Jardins Mar. 9, 1926 1,674,224 Rabut June 19, 1928 2,119,741 Fischer June 7, 1938 2,369,642 Benning Feb. 20, 1,945l 2,371,676 Coyne Mar. 20, 1945 2,580,884 Bowman Jan. 1, 1952` 2,612,012 Becker Sept. 30, 1952

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