US1408802A - Guide device for boring tools - Google Patents

Description

J. M. CROCKER AND W. C. MAGUNE.

' GUIDE DEVICE FOR BORING TOOLS.

APPLICATION FILED MAR. 29. 1921.

1 ,408,8Q2. Patented Mar- 7, 1922.

/0 J 3 6 a 7 /6 4 6 Q W /IN I INVENTORS JAMES M CROCKEI? ATTORNEY JAMIES LVI. CROCKER AND WILBUR C. MAGUNE, OF

FAIRFIELD, CONNECTICUT.

ASSIGNORS OF ONE-THIRD TO MDRRIS REICH, OF BRIDG-EPORT, CONNECTICUT.

GUIDE DEVICE FOR BGPt-ING TOOLS.

Application filed March 29, 1921.

7 '0 (all 2,0 /1 am it may can earn Be it known that we, JAMES M. CRooKEn and WILBUR C. MAGUNE, citizens of the United States, and residents of Fairfield, in the county of F airfield and State of Con necticut, have invented certain new and useful Improvements in Guide Devices for Boring Tools, of which the following is a specification.

This invention relates to a device designed more especially for guiding a boring tool when said. tool is to do its work at a distance from the operator, as for example, when aligning holes are to be made through a series of spaced apart members such as joists.

An object of the invention is to provide a simple and inexpensive device of the present character which can be quickly and easily applied to or removed from a tool, and which will in use etliciently perform its intended function.

A further and more specific object is to provide a guide device which will accommodate itself to holes bored in members by a tool when in, operation to follow the tool through said members, will when released from a member spread out'to guide the tool to the next member, and will accommodate itself to said holes when the tool. is withdrawn from the members.

lVith the above and other objects in view, the invention comprises the construction, arrangement and combination of parts as now to be fully described and hereinafter specifically claimed, it being understood that such changes in details of construction and arrangement of parts may be made as fall within the spirit of theinvention and with in the scope of the appended claims.

In the accompanying drawing forming a part of this specification, V

Fig. 1 is a sectional view of a ceiling and joists, showing a boring tool equipped with the novel device and the device spread as when guiding the tool;

Fig. 2 is a view corresponding with Fig.

1, but showing the guide device as when being withdrawn from the joists, the spreadable part of the device being disclosed in the act of accommodating itself to a hole in a joist;

Fig. 3 is an enlarged elevational view of Specification of Letters Patent.

Patented Mar. '7, 1922. Serial No. 456,777.

the device, bit shank;

Fig. 4 is an end view looking from the right hand side ofFig. 3 and Fig. 5 is an enlarged sectional view on line 5-5 in Fig. 3, looking in the direction of the arrows.

Referring to the drawing, A represents a ceiling or the like, B a series of spaced apart oists extending upwardly therefrom, C a shaft, preferably flexible, adapted to carry a bit or other boring tool D for boring aligning holes E through joists B, and F designates a bit shank of suitable length for its purpose and secured to the shaft bv means of the chuck G in usual manner. e have preferred to show our device arranged upon the bit shank F. It will be clear, however, as the description proceeds, that the device can be applied to the boring tool in any other suitable and convenient manner.

Numeral 10 denotes a tubular member mounted upon the bit shank and within showing the same applied upon a which said shank can rotate, the opposite ends of said tubular member preferably terminating closely adjacent the shaft and bit, respectively, and having-fixed thereon collars, denoted by 11 and 12, respectively, either or both of which may be removable. As shown, the collar 12 is removably secured by the screw 13. Positioned between the col lars and slidably arranged upon the tubular member are a pair of sleeves, denoted by 14 and 15, respectively, numeral 16 denoting a key extendinglongitudinally of the tubular member for the greater part of its length and entering key ways in the sleeves to preclude-the possibility of their rotation on the tubular member, as will be understood.

The slidable sleeves are connected with each other by means of toggle joints each consisting of a pair of links, denoted by numerals 17 and 18, pivoted to each other as indicated at 19, said links being pivoted upon sleeves 14 and 15 respectively, in any preferred manner, as by means of pins 20. Any number of toggle joints may be employed. As shown, we preferably utilize four and position the same uniformly about the tubular member.

Numerals 21 and 22 denote coil springs arranged upon the tubular member and between the collars and slidable sleeves, re spectively, spring 21 having its opposite ends seated against the collar 11 and sleeve 14:,

a diameter of the bit.

and spring 22 having its opposite ends seated against collar 12 and sleeve 15, and the coil springs are normally expanded to hold the sleeves toward each other to thus hold. the toggle joints spread as in Figs. 1 and 3, as will be understood. It preferred, each collar and slidable sleeve may be constructed to provide guide members, denoted by numeral 23, for the opposite ends oi the springs, and stops may be utilized to limit the movement of he slidable sleeves toward. each other. As shown, we preferably provide in the key in the tubular member spaced apart, threaded holes 2% adapted to removably receive stop pins 25, one stop. pin for each sleeve. Obviously, each stop pin can be placed in any preferred hole to allow theslidable sleeves to be normally spaced any preferred distance apart and the toggle joints to be normally positioned at any desired angle. 7

The manner in which the device operates to perform its function will be evident from the description given. As shown more clearly in Fig. 1, the ceiling or the like provides a way over which the toggle. joints slide when the device is in use. lhe stop pins are first set in the proper holes to give the toggle joints the desired spread toguide the tool to bore a hole at the preferred distance from the ceiling or the like. After the. bit has bored a hole through a. oist or other member, forward pressure against the shaft will cause the guide'device to follow the bit through the hole, it being understood that the collarsandslidable sleeves of the guide device are of slightly less diameter than the diameter of the hit. As the links 17 move forwardly they will be engaged closely adjacent their pivotal points 20 by the for ward end of the wall of the hole made by the bit to be swung toward each other-in the manner suggested in Fig. 2, and will, naturally, causethe links 18 to be drawn-toward each other, the coil springs 21 and 22 contracting to an extent to allow the toggle joints to be at a straight angle and enclosed. within a diameter not greater than the Obviously, the wall of the hole in the joist will so hold the toggle joints until links 1.8 have been coinpletely released by said wall. As soon as said links 18 are released, the togglejoints will spread to their normal positions, as in Fig. 1, to guide the tool straight ahead to bore the next hole. It will be apparent that when the toolis withdrawn the toggle joints will ac- 'commodate themselves to the holes against the action of the coil springs in preclsely the manner already described, with the exception that the links 18 will be first to enter the holes, asshown more clearly in Fig. 2.

Having thus fully described the invention, what we claimand desire to secure by Letters Patent is:

1. A guide device of the character described, comprising a supporting member, springs thereon and spaced from each other, slidable sleeves upon said supporting member and between said springs, and toggle joints connecting said sleeves.

2. A guide device of the character de; scribed, comprising a supporting member, coil springs thereon and spaced from each other, slidable sleeves upon said supporting member and engaged by said coil springs, toggle joints connecting said sleeves, and means for locating said springs upon said supporting member, whereby. said coil springs are normally extended to hold said toggle joints spread and said toggle joints can be forced toward said supporting member to compress said springs.

3. A guide device of the character described, comprising a supporting member, spaced apart collars thereon, slidable sleeves upon said supporting member andbetween said collars, toggle joints connecting said sleeves, and coil springs upon said supporti ing member and between said collars and sleeves, respectively, said coil springs being normally expanded to spread said toggle joints.

-l. A guide device of the character described, comprising a supporting member,

spaced apart collars thereomslidable sleeves upon saidosupporting member and bet-ween .ard collars, toggle oints connecting said sleeves, coil springs upon said supporting member and between said collars and sleeves,

respectively, said coilsprings being normally expanded to spread said toggle joints, and

adjustable means for limiting the movement of the slidable sleeves toward each other.

5. In combination with a boring tool having a bit shank, a tubular member in which said bit shank is rotatably mounted, spaced l l (J apart collars upon, said, tubular member,

slidable sleeves upon said tubular member and between said collars, toggle joints connecting said sleeves, and coil springs on said.

tubular member and between said collars and sleeves, respectively, said coil springs being normally- .expanded to. spread said toggle joints, whereb said togglejoints can be positioned at a straight angle against the action of said coil springs.

G. A device as specified in claims, wherein the tubular member is provided with a key adapted to enter key ways in the slidable. sleeves to hold said sleeves against rotation upon said tubular member.

Signed at Bridgeport, in the county of Fairficld, and Stateof Connecticut this.

19th day of March, A. D., 1921; JAJVIES M. CROCKER. WILBUR (l. MAGUNE.

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