US2960132A

US2960132A - Drilling tool

Info

Publication number: US2960132A
Application number: US834612A
Authority: US
Inventors: Finkeldei Hans-Joachim
Original assignee: Individual
Current assignee: Individual
Priority date: 1959-08-18
Filing date: 1959-08-18
Publication date: 1960-11-15
Anticipated expiration: 1977-11-15

Description

Nov. 15, 1960 HANs-JoAcHiM FlNKELDl-:x 2,960,132

DRILLING TooL.

Filed Aug. 18, 1959 5 Sheets-Sheet l DRILLING TOOL 5 Sheets-Sheet 2 Filed Aug. 18, 1959 FIG. 5

FIGJ:L

INVENR Nov. 15, 1960 HANS-JOACHIM FINKELDEI 2,960,132

DRILLING TOOL 3 Sheets-Sheet 3 Filed Aug. 18, 1959 FIG. l0

mm F FIG. 6

lll

United States Patent DRILLING TOOL Hans-Joachim Finkeldei, Untere Lichtenplatzerstr. 80, Wuppertal-Barmen, Germany Filed Aug. 1S, 1959, Ser. N0. 834,612 1 Claim. (Cl. 145-53) The present invention relates to a drilling tool with a drilling spindle having two spiral control grooves disposed in opposite directions and mounted in two selectively usable and releasable nuts, respectively. The drilling spindle is surrounded by a protecting tube which is secured to a handgrip of the tool, the drilling movement being releasable in the complete withdrawn position of the drilling spindle by means of a lock, whereby the drilling head carries exchangeable taps or the like.

It is one object of the present invention to provide a drilling tool wherein the locking of the drilling spindle in its withdrawn position is achieved in such a manner that a shoulder, of a locking fork projects into an annular groove of the drilling spindle, said shoulder being formed substantially as a segment of a circle and having a crosssection forming an edge, and a locking fork freely sliding crosswise to the longitudinal axis of the spindle in a locking nut, the annular groove provided on the periphery of the drilling spindle having a cross-section forming likewise an edge. The control of the fork is brought about by the co-operation of a cam of the fork with a control path of a ring surrounding the locking nut, on the one hand, and by means of the fork arms in connection with additional control curves of the ring, on the other hand.

It is another object of the present invention to provide a drilling tool wherein a ring surrounding a locking nut has at least three control curves or paths, one of which controls the locking cam, while the other two paths engage from the outside the rounded arms of the fork.

It is yet another object of the present invention to provide a drilling tool, wherein the control fork is set laterally into a slot of the locking nut, whereby the two arms of the fork are safely guided against rotation with the inner faces of the parallel arms of the fork on a connecting web remaining after providing the slot.

With these and other objects in view, which will become apparent in the following detailed description, the present invention will be clearly understood in connection with the accompanying drawings, in which:

Figure 1 is a front elevation of a drilling tool;

Fig, 2 is an elevation of the drilling tool partly in section, with inserted drilling nuts;

Fig. 3 is an end view of the double sleeve which is slidable on the hollow shaft;

Fig, 4 is an elevation of the double sleeve mounted on the shaft, the outer sleeve being shown in section.

Fig. 5 is a front elevation of the shaft with a flat spring secured to the locking tongues, the sleeve being removed for better showing;

Fig. 6 is an elevation of the head of the drilling tool showing a part of the hollow shaft;

Fig. 7 is a view partly in section of the locking nut with the surrounding ring;

Fig. 8 is an end view of the locking nut with the locking fork in engaging position;

Fig. 9 is a View similar to that in Fig. 8, yet the fork being shown in releasing position; and

Fig. 10 is a section through the locking nut and the 2,969,132 CC Patented Nov. l5, 1960 surrounding ring crosswise to the longitudinal axis just above the fork.

Referring now to the drawings, the drilling tool 10 carries exchangeable blades, taps or the like, constituting the drilling head which is connected with the drilling spindle 11. The latter is mounted in two

drilling nuts

12 and 13 disposed in a hollow shaft 14. The shaft 14 sits on a protecting tube 15 surrounding the drilling spindle 11 and carrying at its other end the gripping handle 16.

In accordance with the present invention, the

tool drilling nuts

12 and 13 which receive the drilling spindle 11 are of dilferent length and are mounted in accordance with the present invention in a double bearing. The

drilling nuts

12 and 13 are supported at one portion of theirv periphery, which is formed like a wall 18 of the hollow shaft 14, while the other portion 4S and 46, respectively, of the periphery of the

drilling nuts

12 and 13 is received by an axial bearing. This axial bearing is formed for the longer of the two nuts, namely for the nut 13, by a bearing 19 which is step-wise set off relative to the inner wall 18 of the shaft, the nut 13 abutting the end face of a ring 20. The 'other nut 12 is received, however, by a locking nut'21 which may be screwed into the hollow shaft 14 from its end face, by overlapping the portion of the periphery 46 of the drilling pinion 17, on the inner nut 12 which portion has no pinion formation.

A

double sleeve

22 and 23 is mounted on the hollow shaft 14, which double sleeve covers completely the drilling mechanism in the shaft 14. The double sleeve 22 and 2'3 comprises substantially two tube sections telescoped into each other, which are secured against rotation relative to each other in such a manner that an inwardly bent abutment tongue 24, which is disposed at the end face of the outer sleeve 23, co-operates with a recess 25 formed complementary to the tongue 24 in the inner sleeve 22.

The inner sleeve 22 is equipped on a portion of its periphery with a slot 26 which is substantially obliquely disposed to the longitudinal axis of the inner sleeve 22, which slot 26 serves as a guide for a cam 27, which in turn sits on a spring blade 29, the latter working against the locking tongues 2S. Upon rotation of the double sleeve changed, so that, for instance, in one positionone of the locking tongues 28 meshes with the pinion 17 of the nut 13, while the other of the locking tongues 28 is raised, so that the pinion 17 of the latter is freely rotatable. In another position, upon rotation of the

double sleeve

22 and 23 in the opposite direction, the other nut 12 is properly locked, while the nut 13 is freely rotatable. AIn a median position of the spring 29, as shown in Fig, 4 of the drawings, both locking tongues 28 are in engagement with the corresponding pinions 17. A drilling operation is not possible in the last mentioned position 0f the spring 29, since both pinions 17 of the

nuts

12 and 13 are locked.

In order to secure each of the spring positions, the inner sleeve 22 has close to its edge preferably three recesses 30 which are disposed equally spaced apart from each other and are arranged on a common center axis. A spring biased ball rests in the respective recesses 30 in each of the positions of the spring 29, which ball rests in a cavitv 31 or the like provided in the hollow shaft 14. In order to control the adjustment of the spring 29 and the direction of movement for the drill, respectively, the outer sleeve 23 is equipped with a recessed marker 32 on the one hand, and a written marker 33 on the other hand` which co-operates with a marking on the inner sleeve 22 in correspondence with the position of the spring 29. In this manner it is possible, for instance, upon rotation to the right of the

double sleeve

22 and 23 to obtain a right drilling motion, or a left drilling motion upon rotation of the double sleeve 22 and 2:3

22 and 23,'the position of the spring 29 may .be-

in opposite direction. In the median position of the

double sleeve

22 and 23, no drilling motion is obtained, since both locking tongues 28 mesh with the pinions 17. The periphery of the outer sleeve 23 is provided suitably with a knurled portion 3,4l or the. like, in order toobtain a better gripping face during the rotation of: the

double sleeve

22 and 23.

Iniorder to lock the drilling spindle 1'1 in. its. completely withdrawn position, a locking fork 35 is provided, which is insertedv into the locking nut' 21 lateraliy crosswise to the, longitudinal axis of the locking nut 21, so thatv the locking fork 35 abuts with its fork arms` 376 a web por-- tion 37 of the locking nut 2'1 which has remained during the: forming of the slot, the fork arms 36` receiving the web portion 37 therebetweem Thecontrol of the locking fork 35 is achieved in such a manner thatva cam 38 cooperates with a guide path, 39 provided in asurrounding ringu41, which causes an advancement of the fork 35 in radial direction towards the longitudinal center of the axis. By this arrangement', a shoulder 40 of the fork 3S, which is substantially formed as a segment of a circle, engages an annular groove 42 of the drilling spindle 11, so that a reliable locking is obtained; The return of the locking fork 35 into its releasing position is obtained by the co-operation of two

additional control curves

43 and 44 in combination with the fork arms 36, the latter being rounded on the sides opposite to the

control curves

43 and 44, so that the fork arms 36 slide along the curves 43v and 44 easily and without any resistance.

The shown and described embodiment of the present invention is merely an example for the realization of the present invention and not limited thereto, rather, within the scope of the present invention, other embodiments and applications are possible, particularly as to the structurev and design of the drilling nuts 12 andl 13, as well asV of their mounting in the shaft 14. It is` also possible to make the spring adjustment by the combination of the two

sleeves

22 and 23 also by other-means, whereby, however, care must be taken that the spring 29 itself, or its control element, is not accessible from the outside rather is covered by all means. The locking fork 35, as well as its control, could be designed in a manner dilerent from that shown in the described embodiment. It is essential, however, that the control of the fork 35 is obtained by means of cams and fork arms in connection with control curved faces, since by such arrangement return means, as for instance springs or the like, may be eliminated.

While I have disclosed one embodiment of the present invention it is to be understood that this embodiment is given by example only and not in a limiting sense, the scope of the present invention being determined by the objects and the claims.

I claim:

A drilling tool comprising a drilling spindle, a protection tube surrounding said drilling spindle and a hand grip carrying said protection tube, said drilling spindle having two spiral control grooves disposed in opposite directions, and being mounted in two selectively usable and releasable drilling nuts, locking means for stopping the drilling movement in the completely withdrawn position of said drilling spindle, a hollow shaft and a locking nut, the latter being screwed in said hollow shaft and connecting said drilling spindle with said shaft, and said locking means comprising a locking fork having two fork arms equipped with outer rounded faces and having a shoulder formed substantially as a segment of a circle and having a cross-section forming an edge, said drilling spindle being equipped with an annular groove having a cross-sectionforming an edge complementary to the crosssectionv of said shoulder, said locking fork sliding freely into said groove of said drilling spindle crosswise to the longitudinal axis of said drilling spindle, a ring surrounding and carried by said locking nut, said locking fork having a cam disposed at its rear face, said ring having at least three inner ca m faces, a first of said cam faces co-operating withY said cam of said locking fork and a second anda third of said cam faces (zo-operating with said outer rounded faces of said locking fork, said locking nut havingV a slot disposed in a plane extending perpendicularly to the longitudinal axis of said drilling spindle and forming a web on one side of said slot and receiving said locking fork by lateral insertion, and said fork arms of said locking fork having parallel inner faces which engage the end faces of said web in order to secure said lockingv fork againstrotation upon the axis of said drilling spindle.

References Cited in the le of this patent UNlTED STATES PATENTS 1,531,086 Fegley Mar. 24, 1925 1,578,866 Swain Mar. 30, 1926 2,667,357 Andreasson Jan. 26, 1954