US2631479A - Pneumatic tool dresser - Google Patents

Description

R. A. SHILSON 2,631,479

PNEUMATIC TOOL DRESSER March 1 7, 1 953 Filed April 28, 1950 2 SHEETS-SHEET l 45 HIIIIIiiiiiii;

Wilma FIGI I I z 'd Ram a ymon zfson 2 SHEETS-SHEET 2 March 17 1953 R. A. SHILSON PNEUMATIC 'IIOOL. DRESSER Filed-April 28, 1950 v I N I Inventor Rqymond (Z-55215023 Patented Mar. 17, 1953 UNITED STATES m OFFICE PNEUMATIC TOOL DRESSER Raymond A. Shilson, Steep Rock Lake, Ontario, Canada Application April 28, 1950, Serial No. 158,835

2 Claims. (Cl. 76-5) My invention relates to pneumatic tool dressers, morespecifically, to a pneumatic tool dresser of the character herewithin described, an object of which is to provide a pneumatically operated device for dressing pneumatic drills, to replace the present laborious method of dressing such drills manually.

A further object of my invention is to provide a device of the character herewithin described which is capable of being adjusted to give uniform treatment, such as direction of hammer blow, intensity, duration, and the like qualities of the dressing operation, hitherto dependent solely upon the experience and skill of the operator.

A still further object of my invention is to provide a device of the character herewithin described whichwill, because of its rapidity and eficiency, enable the operators to increase the output of drill bits, thus contributing to the increased overall operational efiiciency of the pneumatic hammer or drills.

Yet another obj ect of my invention is to provide a device of the character herewithin described which utilizes the same power source and the same mechanical principles as the pneumatic drills and hammers, thus facilitating its use Without additional prime movers or operating skills than would be readily available for the aforementioned tools.

A And another object of my invention is to provide. a device of thecharacter herewithin described which i relatively economical to manufacture and operate, and otherwise very well suited to the purpose for which it is intended.

With the foregoing objects in view, and such other objects and advantages as will become apparent to those skilled in the art to which this invention relates as this specification proceeds, my invention consists essentially in the arrangement and construction of parts all as hereinafter more particularly described, reference being had to the accompanying drawings in which:

Figure 1 is a side elevation of my invention as it would appear in relation to the work upon which it is to function, also shown therein.

Figure Z is a top plan view of my invention, again with the work also shown in situ thereupon.

Figure 3 is a perspective, fragmentary view showing the connection between the hammer and supporting tube.

In the drawings like characters of reference indicate corresponding parts in the different figures.

The procedure commonly practiced for maintaining heavy drill bits involves hand forging of the said bits, which, because of the relatively heavy pieces upon which work must be done, means that a crew of men is required to handle each bit in rotation. With this time and energ consuming feature in mind, my invention was developed so that one operator can do the work of several, and still produce a refinished tool bit which is more uniform in geometrical characteristics, and in its quality than tool bit refinished by the conventional manual method in common practice.

The entire assembly is supported upon a bed I, fabricated of standard heavy rolled steel bed rails IL and IB, mounted upon a length of heavy tiniber 2. The forward end of this bed is an essentially vertical built-up member 3, the upper end of which is of V-configuration, thus centering any cylindrical bit shank that may be set there in; the lower end of said member straddles the timber 2, and is secured thereto. A back plate 3' is provided against which the rear end of a drill bit may register, thus acting as an anchor for preventin rearward movement of the drill bit during dressing.

At a distance approximately equal to the length of a drill bit, rearwards from the forward end hereinbefore described, a second V block 4 is mounted upon a relatively heavy block- 5, which serves as an anvil, and upon which the drill bit end to be dressed is rested. Drillings are provided in the bed anvil guides 6 to vary the position of this anvil and V block assembly to adjust for varying lengths of drill bits.

A table I fabricated of rolled steel sections is rigidly mounted upon skids 8, thus enabling the said table to be slidably moved along the bed in either forward or rearward direction, as desired. A series of drillings at intervals in the horizontal flanges of the bed rails IL and R. provide attachment for said skids 8 which are also drilled at each end for bolts, which fix the table upon the bed rails.

A heavy gauge steel plate 9, rigidly attached to aforesaid table 'l, supports the device proper.

A conventional pneumatic cylinder and piston assembly In equipped with hose II' to connect it with a source of compressed air, and conven tional control valve i2 is mounted upon an angulated supporting structure described hereinbelow.

The said cylinder is provided with a hammer head l3 having a striking face l3 of rectangular configuration slideably engaging the end of the cylinder and adapted to bestruck by the piston (not illustrated). Loosely connected to said hammer head, a return spring 14 is provided to return the hammer head after each piston stroke in readiness for the next impulse. After making a turn about pin [5, the other ends of spring M are anchored against abutment rod l6 which is fixed to the underside of spring support bracket The said spring support bracket l! is a fabricated, right-angled bracket which is supported at the breech end of the pneumatic cylinder [0, upon the lower ends of recoil rods l8.

The ends of the said rods I8 are screw-threaded to receive nuts I9. Recoil springs 29 are fitted upon the said rods l8 and bear upon a flange 2 I' which is a fixture of the pneumatic cylinder, and upon sprin support bracket I! which is thus retained upon aforesaid recoil rods by clamping pressure between nuts l9 and recoil springs 20.

The pneumatic cylinder Ill itself is rigidly attached to, and supported upon, a frame comprising elongated tubular members 22 and 23, which extend from lower end fittings 24 in close proximity to the spring support bracket I? upward to upper fittings 25. Two lengths of cylindrical tubing are fitted below along and parallel to, the aforementioned tubular members 22 and 23, and supported in the aforementioned end fittings 24 and 25 and comprise tubular guides 25 and 21.

Telescoping into the aforesaid tubular guides 26 and 21, slides 28 and 29 extend, and support crank end fitting 3B. This fitting is maintained in position by means of a third rod 3! which is secured to said crank end fitting 3s and slidably to end fittin 25. A bushing 32, centrally disposed in crank end fitting 30 which is apertured correspondingly, journals a screw-threaded, crank arm ended, feed screw 32'. The arrangement just described permits the axial adjustment of the pneumatic cylinder as a Whole towards or away from the anvil-mounted drill bit by reciprocation of the tubular members 22 and 23 upon slides 28 and 2! the rod 3| reciprocating through end fitting 25.

To provide transverse adjustment, the hereinbefore described feed screw equipped mounting is supported upon a short tubular member 33 by means of a clamp assembly 36 extending from the web 35 between the two side member tubes 22 and 23. Clamping bolt 36 and nut 3'! secure the pneumatic cylinder mounting structure to the supporting tubular member 33. Thi member then is free to run between two sets of upper and lower rollers 39 and 40 transversel across table top 9. The rollers 33 and 4B are journalled for rotation within a pair of U brackets 4! secured to and upstanding from the table top 9. Actuating lever 42 of the second order is bracketted 43 to the support cylinder 33, and is pin connected thereto by pin 44.

An extension 35. of bed plate 1! bears a fulcrum pin 39' upon which said lever hinges. The operator may then move the cylinder mounting, together with the piston and hammer, to and fro across the face of the drill bit to be dressed, during the operation of the hammer.

A single inverted U bracket 45 angulated so as to be perpendicular to the axis of the pneumatic cylinder is rigidly attached to the bed plate 9, and serves to provide support for the feed screw mounting at its lower end.

The associated drill bit at that is to be dressed is mounted within the V block 4 and the rear 4 member 3, the former being positioned within the bed as hereinbefore described.

The assembly is located along guides IL and IR to bring the hammer head [3 within range of the drill bit head 41. Relatively fine adjustment of the position of the hammer head I3 is obtained by the aforementioned feed screw 32, thus causing the cylinder [0 and the tubular members 22 and 23 to move along members 29 and 3|.

Compressed air is now fed to the cylinder l0 thus causing the hammer head l3 to reciprocate rigidly against tension of spring 14 thus striking the inclined face 4-8 of the drill bit. At the same time lever 42 is actuated thus causing the assembly to move transversely across tubular member 33 thereby causing head l3 to strike the face E8 of the drill bit across the width thereof. The

drill bit is then turned through and the opposite side of the bit is dressed in a similar manner.

In conclusion it will be noted that the angular relationship of the assembly to the face 48 .of the drill bit can be adjusted, if necessary, by the aforementioned clamping bolt 36 which secures the assembly rigidly to tube 33 although in this connection it will be appreciated that the front support bracket 45 will have to be varied in height to compensate for this adjustment.

Since various modifications can be made in my invention as hereinabove described, and many apparently Widely different embodiments of same made within the spirit and scope of the claims without departing from such spirit and scope, it is intended that all matter contained in the accompanying specification shall be interpreted as illustrative only and not in a limiting sense.

What I claim as my invention is:

1. An assembly for dressing mining drill bits and the like comprising in combination, a supporting bed, a table secured to said bed, a cylinder inclinably mounted upon said table, a piston reciprocal within said cylinder, a hammer head extending from one end of said cylinder, a return spring extending between said hammer head and said cylinder, an anvil also mounted upon said bed for supporting an associated drill bit to be dressed, adjacent said hammer head, anchoring means to prevent lengthwise movement of said drill bit during dressing, and means to provide relative transverse movement between said hammer head and the head of said bit, said means including a pair of U brackets extending upwardly from said table, a supporting tubular guide journalled for transverse movement within said U brackets, a clamp assembly extending between said tubular guide and said cylinder, and means to move said supporting cylinder Within said U brackets.

2. An assembly for dressing mining drill bits and the like comprising in combination, a supporting bed, a table secured to said bed, a cylinder inclinably mounted upon said table, a piston reciprocal within said cylinder, a hammer head extending from one end of said cylinder, a return spring extending between said hammer head and said cylinder, an anvil also mounted upon said bed for supporting an associated drill bit to be dressed, adjacent said hammer head,anchoring means to prevent lengthwise movement of said drill bit during dressing, and means to provide relative transverse movement between said hammer head and the head of said bit, said means including a pair of U brackets extending upwardly from said table, sets of rollers mounted within said U brackets, a supporting tubular REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 996,807 Smyth July 4, 1911. 1,408,176 I-IDoubler Feb. 28, 1922 10 1,614,649 Butler Jan. 18, 1927 1,667,236 Bergquist Apr. 24, 1928 Worth Aug. 24, 1948

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