US3919759A

US3919759A - Drill drifting device

Info

Publication number: US3919759A
Application number: US391813A
Authority: US
Inventors: Robert E Marleau
Original assignee: Individual
Current assignee: Individual
Priority date: 1972-12-19
Filing date: 1973-08-27
Publication date: 1975-11-18
Anticipated expiration: 1992-11-18
Also published as: CA968191A

Abstract

A drift for ejecting a taper shank drill from its socket characterized by the fact that the drift is secured at one end to a rod over which a heavy sleeve may slide. The sleeve is releasably retained to the rod at the rear end thereof and is adapted to be projected towards the forward end of the rod and to strike an abutment fixed to the forward end of the said rod. The momentum makes the drift penetrate in the drill socket and dislodge the drill.

Description

United States Patent Marleau Nov. 18, 1975 [5 DRILL DRIFTlNG DEVICE 1,521,265 12/1924 Anderson 29/254 2.475.041 7/1949 Muttson 1 29/254 UX [76] Inventor- :g g i figg g g Ave-1 3,757.409 9/1973 Flanigan 29/254 on rea ue ec, Canada Primary E.\'aminerAl Lawrence Smith [22] Flledz Aug. 27, 1973 Assistant E.\'aminerHarOld P. Smith, Jr. [21] pp No 391 813 Attorney, Agent, or FirmRoland L. Morneau [30] Foreign Application Priority Data 51 ft f ZT IL d n f k D 19, 1972 c d 1 94 2 electmg a taper S F SOC ct ec am a 5 5 characterized by the fact that the drift is secured at 52 us. c1 29/254 29/253 one end to a Over which a heavy Sleeve Slide- 51 1m. (:1. BzsB 27/02 The Sleeve is releasably retained to the rod the [58] Field of Search 29/253 81/52 end thereof and isadaptcd to be projected towards the 254/104. 72/457. 2 6 5 forward end of the rod and to strike an abutment fixed Y 7 to the forward end of the said rod. The momentum 5 References Cited makes the drift penetrate in the drill socket and dislodge the drill. UNITED STATES PATENTS 891,022 6/1908 Weaver 29/253 2 Claims, 3 Drawing Figures DRILL DRIFTING DEVICE This application is directed to a drill drift and more particularly to a drill drifting device which requires the use of only one hand, the other hand being used to hold the drill and prevent it from falling.

The commonly used drill drift, well known by ma chine shop technicians, consists of a single steel wedgeshaped element. The small end of this element is introduced into an elongated hole which extends through a socket, connecting the drill to the drilling machine. While the technician holds the drift with one hand, his other hand is used to hold a hammer for hitting on the large end of the drift. The drill is suddenly projected out of its socket and falls on its point against a metal table.

Two disadvantages occur. The drill is slightly damaged every time it falls. The point is dulled and the cutting edge of the drill is nicked practically every time it hits the metal table. Considering the price of some of these drills, this damage should be prevented.

Some of the drills, andparticularly the taper shank ones, may have a diameter of three inches and a half and are therefore heavy tools. When such a drill falls, it happens that it sometimes hits the leg, the ankle or the foot of the machine operator. It then becomes a dangerous weapon.

It is the object of the present invention to prevent the fall of the drill by freeing one hand of the operator so that he can hold the drill while the latter is drifted out of its housing by the other hand. With this prevention, the drill will not be damaged and the operator will not be hurt.

The invention will now be described in greater details with the help of the annexed drawing, wherein,

FIG. I is a perspective view of the drifting device according to the invention,

FIG. 2 is a longitudinal sectional view thereof, and

FIG. 3 is a cross-sectional view of the device taken along line 3-3 of FIG. 2.

The drill drifting device shown in FIGS. 1 and 2 comprises a cylindrical rod or shaft over which slides a hollow cylindrical sleeve 12. A wedge-shaped drift 18 is mounted at the forward end of the shaft 10. This drift 18 is welded at its rear end, to a flat circular plate 20 having the same diameter as the shaft 10. A hollow cylindrical coupling 22 threadedly connects the drift 18 to the shaft 10. The coupling is completly opened at its rear end and has a slot at its front end for letting the drift pass therethrough. A small radial screw such as screw 16 in the bolt 14 may be passed through the coupling 22 to prevent its unfastening on the shaft 10.

This sliding sleeve 12 is stopped at the rearward end of the shaft 10 by a bolt 14 threadedly engaged on the shaft 10 and secured in position by a radial screw 16. The movement of the sleeve 12 is stopped at its forward part by the coupling 22.

One hand of the operator supports the device by gripping it around the sleeve 12. The main purpose of the device is to project forward the sleeve 12 and strike the coupling 22 so that the wedge-shaped member 18 will receive a forward momentum and dislodge the drill from its socket.

A ring 24 is welded on the forward surface of the sleeve 12 so as to protect the hand of the operator from being pinched by the coupling 22.

In order to increase the propulsion the the sleeve 12, an arrangement is foreseento provide a small retention of the sleeve 12 on the shaft 10 in its rearward position. This arrangement consists of a small coil spring 26 mounted in a cylindrical cavity .28 provided radially in the shaft 10. The sleeve 12 is provided with a semidoughnut shaped cavity 30 recessed on its inner surface. This cavity 30 is aligned with the cylindrical cavity 28 when the sleeve 12 is in its rearward position, as shown in FIGS. 2 and 3. A small spherical ball 32 is partly located in the cavity 30 and is squeezed thereinto by the coil spring 26. The tension of this spring is calculated so that a relatively firm axial thrust of the hand on the sleeve 12 will make the ball 32 recede into the cavity 26. The fact that the initial motion of the sleeve requires a preliminary thrust, it is clear that it will move at a greater speed and therefore will hit the coupling 22 with a greater momentum than if there was no such arrangement. The momentum being the product of the mass of the sleeve by its speed when it reaches the coupling 22, it can be understood that the greater the speed, the smaller the mass needs to be. From this rea soning, it may be realized that a triggering system may be used to speed up the sleeve and reduce further the value of the mass.

The releasably retaining arrangement may also be constituted by a releasable clip connected between the rear of the sleeve 12 and the nut 14.

In the device as shown in the drawing, the sleeve 12 is mounted on the shaft 10 by introducing it from the left end of the shaft. When the ball 32 has reached its position in the cavity 30, the nut 14 is adjusted at the end of the shaft so that the sleeve will return to its starting position when the device is held with its element 18 pointing downward. The screw 16 is then tightened.

The drifting device is usually booked in the vicinity of the drilling machine. For this purpose, the nut 14 is gripped on two opposite faces by a booking ring 34.

When the wedge-shaped element 18 is projected through the socket retaining the drill, it comes to a stop when the coupling 22 hits the said socket. This means that a repeated metal to metal collision would tend to wear off these parts. For preventing this to happen, a small plastic rod 36 is passed through the member 18 and in contact with the coupling 22. The rod 36 takes a hard beating but it may be replaced without great expenditure.

It is obvious that this device may be modified in many ways without changing the essence of the invention. While a coupling 22 is used to retain the element 18, it is understood that the latter could be welded to the shaft.

Similarly, the nut 14 could be replaced by a perforated disc or the like which would require no threads on the shaft.

I claim:

1. A drill drifting device adapted to drift a taper shank drill or the like outside its socket comprising;

a rod member.

a wedge-shaped element axially secured at one end of the said member and adapted to be introduced through the said socket,

a heavy sleeve adapted to freely slide over substantially the full length of the said rod member,

a stopping member secured to said rod member at each end thereof for stopping the movement of said sleeve.

3 means for releasably retaining the sleeve to the end of said rod member remote from said wedgeshaped element. the said means comprising a compressible spring member radially mounted between the said rod member and the said sleeve for blocking the sliding motion of the sleeve relative to the rod member, whereby the sliding movement of the sleeve on the rod member produces a retraction of the spring member in the rod member or the sleeve.

Claims

1. A drill drifting device adapted to drift a taper shank drill or the like outside its socket comprising; a rod member, a wedge-shaped element axially secured at one end of the said member and adapted to be introduced through the said socket, a heavy sleeve adapted to freely slide over substantially the full length of the said rod member, a stopping member secured to said rod member at each end thereof for stopping the movement of said sleeve, means for releasably retaining the sleeve to the end of said rod member remote from said wedge-shaped element, the said means comprising a compressible spring member radially mounted between the said rod member and the said sleeve for blocking the sliding motion of the sleeve relative to the rod member, whereby the sliding movement of the sleeve on the rod member produces a retraction of the spring member in the rod member or the sleeve.

2. A device as recited in claim 1, wherein the spring member comprises a coil spring and a metal ball located at one end thereof, the rod member is provided with a radially oriented cylindrical recess for receiving the coil spring and a part of the said ball, the said sleeve being provided with an internal circumferential groove for receiving the remaining part of the ball when the sleeve is in its said stationary position.