US2898118A

US2898118A - Adjustable drill holder

Info

Publication number: US2898118A
Application number: US534469A
Authority: US
Inventors: Frederick H Smith
Original assignee: Individual
Current assignee: Individual
Priority date: 1955-09-15
Filing date: 1955-09-15
Publication date: 1959-08-04
Anticipated expiration: 1976-08-04

Description

Aug. 4, 1959 F. H. SMITH ADJUSTABLE DRILL HOLDER Filed Sept. 15, 1955 2 Sheets-Sheet 1 ill! I I 1 u H fkz'ofe cx A. J'M/ TH, INVENTOR.

g- 4, 1959 F. H. SMITH 2,898,118

ADJUSTABLE DRILL HOLDER Filed Sept. 15, 1955 2 Sheets-Sheet 2 lh gmllii ii fkEDE/P/cK h. JM/r/v,

INVENTOR.

ATTO/P/VEY.

United States Patent ADJUSTABLE DRILL HOLDER Frederick H. Smith, Dayton, Ohio Application September 15, 1955, Serial No. 534,469

4 Claims. (Cl. 279-16) The present invention relates to adjustable holders for drills, the same being adapted to provide means for holding drills to provide a means permitting self alignment of the drill with the work, and is adapted for use in connection with both automatic and hand-operated screw machines.

The principal object of the present invention is the provision of a drill holder in which is provided means by which the device is self-aligning and with the same being provided with means for maintaining the self-aligned position.

A second object is the provision of a drill holder in which the aligning parts thereof provide floating means in the operation of the alignment thereof.

Another object is the provision of a self-aligning and adjustable drill holder which is simple of operation and which is composed of a minimum number of parts.

Other particular objects and advantages of the invention will become apparent in the course of the following description, and that which is new will be pointed out in the appended claims.

The preferred and most satisfactory manner of carrying out the principles and advantages of the invention in a practical, economical, and efiicient manner is shown in the accompanying drawings, in which:

Figure 1 is a side elevation of a drill holder embodying the features of the invention.

Figure 2 is a side elevation of the shank member of the device.

I Figure 3 is an end elevation of the shank member, taken from line 3-3 of Figure 2.

Figure 4 is a detail section through the shank member, taken on line 4-4 of Figure 2.

Figure 5 is a side elevation of the tool head member of the device.

Figure 6 is a detail forward end view of the tool head member, taken from line 66 of Figure 5.

Figure 7 is a detail rear end elevation of the tool head member, taken from line 7-7 of Figure 5.

Figure 8 is a detail section through the tool head, taken on line 88 of Figure 7.

Figure 9 is an elevational side view of the drill bushing member which is used in conjunction with the holder.

Figure 10 is an end elevation of the bushing, as taken from line 10-10 of Figure 9;,

Figure 11 is a rear end elevation of the connecting collar member of the device.

Figure 12 is a detail vertical section through the connecting collar member, taken on line 1212 of Figure 11.

Figure 13 shows an assembly of the parts and the position thereof after alignment of the drill but before final tightening of the collar member, and with a portion of the collar being shown broken away.

Figure 14 is a detail similar to that shown in Figure 13, but showing the parts thereof in final tightened condition.

Figure 15 is a detail section through the shank of the assembled device, taken on line 15--15 of Figure 1.

2,898,118 Patented Aug. 4, 1959 ICC Figure 16 shows portions of a machine and the adaptation of the device thereto and with the same being in operative relation.

Figures 17 and 18 are face and edge views respectively of a wrench especially adapted for use in tightening and loosening the collar member of the device.

Like characters of reference designate like parts throughout the several views of the drawings.

In order that the invention may be more fully understood and appreciated, I will now take up a detailed description thereof, in which the same will be more fully set forth.

Referring now to the drawings in detail, numerals 20 designate the cylindrical shank member of the device, with the shank portion thereof being tubular and having shank head 21 formed on the forward end thereof. A pair of diametrically-opposed lugs 22 are formed on the forward face of the head 21, and with the forward face surfaces 23 of the head being ground and polished to 'an extremely smooth surface for contacting engagement with the rear surface of the tool head member. As clearly seen in the drawings, the forward fiace surfaces 23 are radially disposed.

The tool head member is composed of a body 24 having threads 25 formed at the rear end thereof and with bore 26 being formed therein for the reception of the drill bushing member. A bore 27 is formed at the rear end of the body and is of smaller diameter than bore 26 and forming a shoulder 23 within the body and forming a stop limiting the distance of insertion of the bushing member therein. The rear surface of the body is machined to provide slots 29 for receiving the lugs 22 of the shank member. It will be noted by comparison that slots 29 are considerably greater in width and in depth than lugs 22 which permits a loose fit between the lugs 22 and the slots 29. The rear end surfaces 30 of the tool head member is finely ground and polished to make frictional contact with the surfaces 23 of the shank head member. The rear end surfaces 30, as clearly seen in the drawings, are radially disposed.

The .drill bushing is of a type similar to that shown and described in Patent No. 2,676,809, issued April 27, 1954, now reissued as Reissue No. 24,348, and is composed of two identical halves 31 expandably secured together by means of a pair of spring rings 32 which provides a frictional grip on the shank of a drill 33. The drill bushing is removably secured in the tool head member 24 by means of set screw 34 which is threaded through the wall of the head member, as more clearly shown in Figures 5 and 6.

The connecting collar member 35 has threads 36 formed therein to match the threads 25 of the tool head member and has bore 37 formed through the rear wall thereof for the reception of the shank 20. It will be noted, by referring to Figure 15, that bore 37 is considerably larger than shank 20 and permits movement of the collar in any direction in the aligning operation. A wrench-receiving channel 38 is formed around the periphery of the collar, and blind holes 39 are provided about the collar for the reception of the lug 40 of wrench 41.

Figure 16 shows the drill holder in position for operation in connection with a machine, with 42 being a part of the machine through which stock 43 is fed and held therein by means of collet 44. The holders are secured in a turret member 45 of the machine by means of screws 46.

In the use of the holder, the surfaces 23 of the shank head 21 are placed against the surfaces 30 of the tool head member 24 with lugs 22 being positioned in slots 29, after which collar 35 is brought into position over shank 20 and threaded onto threads 25 of the tool head. Bushing 31, together with drill 33, is positioned in the tool head-with the rear end of the bushing being seated against shoulder 28 of the tool head member, after which set screw 34 is tightened agains'tbushing 31. p

[In the operationof aligning the drill with the work, collar 35 is tightenedslightly by hand while alignment is being established by the orbitary movement of the tool head with relation to the'shank. Withthe collar being tightened by hand the r'elationof the slots 29-assume the position shown -in Figure 13 with relation to the lugs 22, after which the collar is tightened by means of wrench 41 with the wrench lug 40 engaging one of the blind holes 39 of-the collarmember, and with the wing portionsof the wrench being engaged in channel 33. Upon tightenirig'of-the collar by means of the wrench, the slots 29 assume the position shown in Figure 14 withrelation to lugs-22. With

threads

25 and 36 being left hand, engagement of the drill with the work 43 causes pressure in the direction of the arrow in'Figure l4'and causing the slots 29 to bear against lugs 22 as shown in Figure 14. With

surfaces

23 and 30 being ground and polished, the same provide frictional contact therebetween with only a nominal pressure of the collar member.

' When realignment is desired, collar 35 is loosened slightly by means of wrench 41 and, with the new alignment being completed, collar .35 is again tightened to maintain the alignment. It will be noted that, 'due to the design of the wrench, it is not necessary to remove the wrench from the collar during the realignment operation.

It will be-noted'that holes 39 are blind in that they are not formed entirely" through the wall of the collar. The blind holes provide means preventing drilling chips or shavings from reaching the

threads

25 and 36.

'The drill holder herein shown and described is an improvement'over the Self-Aligning Tool Holder shown in. my pending application, Serial No. 454,705, filed September 8, 1954 now Patent No. 2,768,832 in that the

members

20 and 24 are held in frictional contact by reason of

surfaces

23 and 30 respectively being ground and highly polished.

It is desired that it be understood that the presently preferred embodimentof the invention is shown and described herein, but'that the same is not to be limited to the specific construction herein shown and described, but that minor changes may be made therein insofar as the changes may fall within the scope of the appended claims.

Having now fully shown and described the invention,

4 what I claim and desire to secure by Letters Patent of the United-States, is:

1. An adjustable drill holder comprising a tool head adapted to receive a drill bushing, the rear surface of the tool head having radially disposed slots, the rear end of the tool head having radially disposed finely ground and polished surfaces, a shank member, a head portion formed on one end of the shankmember, said head portion having radially disposed lugs positioned in the slots of the toolhead, 'said' lugs having less width and depth than the slots, the forward radially disposed surfaces of the head portion being ground and polished and abutting the rear end radially disposed polished surfaces of the tool head member, and an adjustable collar securing the tool head with relation to the head portion of the shank, said lugs preventing rotation of the tool head with respect to the shank.

2. An adjustable drill holder according to claim 1, wherein the slots on the rear surface of the tool head are diametrically disposed and wherein the lugs on the head portion of the shank member are diametrically disposed.

3. An' adjustable drill holder according to claim 1, wherein the outer peripheral portion of the head is threaded and wherein the collar threadedly engages the threaded portion of the head member to adjustably secure the forward face of the shank head in frictional engagement with the rear surface of the tool head, said collar having a wrench receiving channel formed therearound and blind lug receiving holes being formed aroun the collar in the wrench receiving channel.

4. An adjustable drill holder according to claim 1, wherein the tool head is provided with left handed threads and the collar fits over the head portion of the shank member and being provided with internal threads engaging the left handed threads of the tool head.

References Cited in the file of this patent UNITED STATES PATENTS 687,563 Hendrick Nov. 26, 1901 1,359,103 Randa Nov. 16, 1920 1,369,491 Straehle Feb. 22, 1921 1,424,535 Watts Aug. 1, 1922 2,004,077 McCartney et a1. June 4, 1935 2,327,897 Howard Aug. 24, 1943 2,399,808 Jones May 7, 1946 2,498,148 Berritta Feb. 21, 1950 2,767,564 Green Oct. 23, 1956