US1423563A - Rigid milling machine - Google Patents

Description

0. HOPPE. RIGID MILLING MACHINE, APPLICATION FILED MAR. 28, 1 92]. 1,43 ,563 Patented J My 25, 1922.

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RIGID MILLING.MACH|NE.

APPLICATION FILED MAR. 28, 1921.

Patented July 25, 1922.

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0. HOPPE. RIGID MILLING MACHINE. APPLICATION FILED MAR. 28, 1921.

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Patented July 25, 1922.

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O. HOPPE.

RIGID MILLING MACHINE. APPLICATION FILED MAR. 28, 1921.

1,423,563. Patented July 25,1922.

5 SHEETSSHEET 5.

09m enfar' OSCAR HOPPE, OF RORSCHACH, S'WITZERLANDyASSIGNOR '10 A. KEMPIN, OF

1 RORSCHAGH, SWITZERLAND.

RIGID MILLING MACHXNE.

specification cit-Letters Patent.

Patented July 25, 1922.

Application filed. March 28, 1921. Serial No. 458,383.

To all whom it may concern: v

Be it known that I, Usoan Horrn, a citi- Zen of the German Republic, and a resident of Rorschach, Switzerland, have invented certainnew and useful Improvements in Rigid Milling Machines, of which the following is a specification.

In a prior U. S. Patent application SerialNo. 439,183, filed January 22, 1921, I have described a rigid milling machine with a machine table guided in a vertical direction wherein the outer guide is connected .with the overhanging arm and is constructedas atelescopic support.

. The subject-matter of the present invention is a further improvement of. the rigid type milling machine the essential characteristic of which consists in so constructing I Ithepart of the working table which encloses the vertical guide adapted to be connected to the overhanging arm that the said part also. encloses the connecting support proper. this arrangement the full guide length is maintained in any vertical adjustment of the machine table and the bracing of the machine table by the outer guide is shifted towards the cutting points of the cutters.

A further feature of the invention is the peculiar construction of the locking head which is provided with a bearing for receiving the support of the milling arbor and the full utilization of the capacity of the machine are obtained. Both parts of the telescopic vertical guide and the locking head are rigidly connected with each other by one screw-bolt, which permits a most simple manipulation and operation of the connecting support.

The sub ect matter of the invention is illustrated by way of example in the accompanying drawing in various forms of construction.

Fig. 1 is a vertical section of'one embodiment of my invention.

.the modification shown in Fig. 4:.

Fig. 6 is a modification of a detail.

milling arbor, whereby better Fig. '7 is a vertical section, Fig. 8 a horizontal section, and

Fig. 9 a front view of a further embodiment of the invention suited particularly for heavy machines.

In the drawings 1 (Fig. 1) indicates two clamping bolts of the machine frame 2 adapted to secure in the desired position the overhanging arm 6 mounted in said frame. The shaft 5 is journaled in frame 2, and is coupled to the cutter arbor 7. The working table consists of a bed 9 and a mounting table 11 provided with a saddle 12. The feed screw 15 of the working table, is mounted in a boss 14 of the bridge 16, which is mounted on the base plate 10. Attached to the overhanging arm 6 is the adjustable bracket 18 for supporting the cutter arbor '7. A tubular member 3 on one end of the bed 9 encloses a hollow cylindrical guide or support 36 serving as an outer support or guide for the machine table, a part 4 on the other end of the bed 9 engages the beveled guide 10 of the frame 2. A cylindrical connecting support 26 is adapted to be telescopically mounted in the guide 36; these two parts constitute the telescopic support. The tubular part 3 of the bed 9 with its head or top part Eprojects over the outer guide 36 and encloses the connecting support In any vertical adjustment, the table retains its secure guiding and the same guide length and, as a consequence, maintains an absolutely rigid mounting, which facts substantially contribute to and promote thesmooth running of the machine. This increased stability is further enhanced inthat the guide member 3 of the machine table extends upward nearly to a point on a level with the surface of the mounting table, so that in a horizontal plane it reaches as close as feasible to the cutting point of the milling cutter. Hence, the four bracing points for themachine table formed by the upper and lower ends of guide parts 3, 4, can be symmetrically arranged with reference to a horizontal plane through the supporting surface of the machine table in order to realize a maximum of guiding security and the most favorable straining of the spindle.

When milling bulky blanks that extend beyond the telescopic guide, the connecting :support 26 is plunged into the guide 36 until the flange 26 of the connecting support 26 comes to rest upon the head 8. Then the upper edge of the connecting support 26 lies below the upper edge of the mounting table 11. ll hen doing vertical milling work on such bulky blanks, that necessitates vertical shifting of the working table with plunged connecting support 26, the latter on account of its upper flange is carried along during such upward movement of the machine table. At the downward movement of the working table, the connecting support 26, by virtue of its own weight, partakes of the downward movement. If necessary the con necting support 26 may also be caused to partake of the vertical travel of the working table by the application of positive means. To this end a screw 33 is provided for clamping the connecting support 26 to the head part 3' of the machine table. As it will readily be understood, the latter is then doubly guided, namely, by parts 3, and 26, which increases the stability of the telescopic guide when the connecting support is plunged.

The head part 3 also increases the guiding capacity of the connecting support 26 when the latter is lowered or raised. The head part 3 of guide 3, affords in each vertical adjustment of the working table, protection for the guiding faces against the entrance of dirt and milling chips; such exclusion of dirt etc. being also attained, when the connecting support 26 is plunged, in that the flange 26" of the connecting support 26 acts, so to speak, as a cover.

A locking head 24 is provided for uniting the connecting support 26 with the over" hanging arm 6. This head, which is hollow is shifted upon the overhanging arm, and is provided with a bearing for one end of the milling arbor 7 which latter with the aid of support 18 aitords an excellent mounting. This supporting means furthermore permits the cutting tools to approach within close prouimity of the outer guide, so that the working range of the machine is increased. The connecting support 26 in moving up ward strikes an abutment 86' on the guide 36, the latter being slightly tapered towards the abutment 36. The fastening of the connecting support 26 to the locking head 24 and to the outer guide 86 is effected in such a manner that the head 8 encloses the connecting support 26 tightly and completely in each adjustment of the machine table.

In the first embodiment (Figs. 1 to 3) the connecting support 26 has a tapered end 26 which engages a corresponding bore provided in the locking head 24. Into the connecting support 26 is screwed a screw spindle 51 which is operated by means of bevel gearing 52 and a hand wheel 53. By tightening the screw 51 a positive and rigid connection between the locking head 24, connecting support 26, and outer guide 36 is effected, the various strains of this connection being taken up by rigid abutments. It the connecting support 26 is to be plunged into the outer guide 36, the clamping bolt 33 and the single screw 51, must be loosened. Consequently, the manipulation is the simplest imaginable. The bridge 16 and the outer guide are made in one piece.

In the second form of construction (Figs. 4 and the connecting support 26 is hollow and is equipped with a projecting cover 54 formed with a recess with which engages a corresponding projection 24 of the locking head 24. Into the hollow connecting support 26 is inserted a tension device comprising a tube 55 which at its bottom end has internal threads adapted to be engaged by a spindle 56 provided with threads at its upper end, said spindle being secured in a plate 35 which closes the lower end of the outer guide 36% In this construction the outer guide 66 is secured in the boss 20 provided on the bridge 16. At the top end the tube 55 is provided with a flange 55 which is seated in a recess in the connecting support 26 below the cover 54, by which means the tube is held against displacen'ient. The upper end of the tube 55 has external threads whereby it is connected with the locking head 24 A key 57 can be introduced into the locking head 24, by passing it through a hole 6' formed in the overhanging arm 6, and be inserted with its square end 57' into a corresponding recess 55" of the tube 55. By turning the tube 55 by means of the key 57 in the proper direction, positiveand rigid connection is obtained between the locking head 24, connecting support 26 and the outer guide 86. The tube 55 eliminates all possibilities of axial and radial play. 'By turning the tube in the opposite direction, it is disengaged from the locking head 24, and simultaneously screwed downward on the threads of spindle 56, and is finally disengaged from the latter, so that the connecting support 26 can be lowered.

' With the aid of the tightening element (tube 55) inserted into the connecting support 26 the latter firmly pressed against the abutment 36 of the outer guide 86 as well as against the locking head 24 and this'connection is very convenient to use in practice, as only the key 57 is required for effecting the connection. Fluid under pressure is introduced through a pipe 19 into the outer guide 36 for the purpose of raising the connecting'support 26*- to a point where the threads of tube 55 may, by turning the latter, be caused to engage with the corresponding counter-threads of the head 24' i The modified construction illustrated in Fig. 6 of a detail refers to the embodiment of the present invention first referred to 1 ,eaaees (Figs. 1 to 3), The screw spindle 51 is here extended upwardly and is passed through the curved overhanging arm 6. I The hand-wheel'58 is placed directly upon the spindle 51 f i In the embodiment illustrated in Figs. 7 to 9 which is to be employed in heavy'ma chines, the outer guiding of the bed is effected exclusively upon the connecting support 26 which, telescopically encloses the guide column 36 In this construction the column 36 is made integral with the bridge lG'which is mounted on the base plate 10. Alon-g said guide column SGFslidesthe connecting support 26* which at its bottom end has a stopring ,8 5 and at its top a plate 81, both of which are rigidly secured to the connecting support26 Upon an overhanging arm 6 is provided a locking head 24* which in the same way as set forth in connection with Figs. 1 to 6 can be fixedly connected to the overhanging arm 6. The locking head 24? has-a bore at its lower end into which fits a corresponding projection 80 of the plate 81. In the locking head 24 is mounted a screw spindle 79 which can be actuated by means of two bevel gear wheels and a hand wheel 77. The connecting support 26 can be raised in the manner illustrated in Fig. 1 to a point where the plate 81 abuts against the end of screw spindle 7 9. By turning the hand wheel 77, the screw 7 9 is screwed into the plate 81 and the latter is firmly pressed against the locking head 2 1 At the same time the stop ring 85 comes to rest firmly against a corresponding abutment surface 84: of the enlarged end of the column 36. The proj ection 80 of plate 81 likewise fits in the corresponding hole of the locking head 24". Loose play of the connecting support 26 in radial direction is obviated in that the cylindrical projection 80 and the bottom end of the connecting support 26 are turned to be tightened. A square end 7 6 upon the shaft of the hand wheel 77 makes it possible to perfectly tighten the screw 7 9 by means of a long wrench. The single screw 7 9 sufiices for uniting the column 36 the connecting support 26", and the locking head 2 .0 in a positive and absolutely rigid manner.

The guiding or feeding of the bed 9 on the connecting support 26 reaches to slightly below the center of the milling arbor. The upper end of the outer guide 3, when it occupies its topmost position, comes to lie immediately below the edge 82 of the plate 81 in order to prevent the entering of dirt and cuttings.

For the working of bulky pieces extending beyond the outer guide, the connecting support 26 may be lowered until it comes to rest with the projecting edge 82 of plate 81 upon the outer guide 3 of the bed 9. The upper edge of the plate 80 is then below the upper edge or the mounting table 11. The outer guide 3 or the bed 9 can be clamped ifast upon the connecting support 2'6 by means of the boltsv iVhen milling in vertical direction, the bed 9 jointly with the connecting support 26 slides along the guide 00lt111111 36. In order to facilitate the movement of the connectii'ig support 26, the same may be balanced by means of a counter weight 86 which is attached to the connect ing support 26 by means of ropes running over pulleys 83.

Having thus particularly described the nature of my invention, what and desire to secure by Letters'Patent of the United States is:

A milling machine, comprising a frame having an overhanging arm, a guide column, a support telescopically connected with the latter and adapted to connect the overhanging arm and the guide column, and a work-table bed having an end portion overlapping the guide column and enclosing the connecting support.

2. A milling machine, comprising a guide column, a support telescopically connected with the latter, a work table bed having an end member overlapping the guide column, and enclosing the connecting support, and means for connecting the latter to said end member whereby said support and member are movable in unison.

3. A milling machine, comprising a frame having an overhanging arm, a cylindrical guide column, a support telescopically connected with the latter and adapted to connect the arm and guide column, and a worktable bed having a cylindrical end portion overlapping the guide column the top of said end portion being contracted and embracing the connecting support.

d. A milling machine comprising a frame having an overhan ,'in 9 arm, a guide column, a support telescopically connected with the latter, a locking head. on the overhanging arm, and a tension device for connecting the support to the overhanging arm.

5. A milling machine comprising a frame having an overhanging arm, a guide column, a support telescopically connected with the latter, a locking head on the overhanging arm, a tension. device mounted in the support having a threaded end for connection with the locking head, and means for connecting the tension device to the guide column.

6. A milling machine comprising a frame having an overhanging arm, a locking head on the free end of said arm, a cutting arbor journaled in the head, a guide column, a support telescopically connected with the latter, means for detachably connecting the support to the locking-head, a work table bed ha ing a cylindrical end portion overlapping the guide column and enclosing the I claim as new i support, and means for clamping the cylindrical end portion to the support.

7. A milling machine, comprising a frame having an overhanging arm, a vertical guide column, a work-table bed slidably mounted on the frame and having a cylindrical end portion surrounding the column, means for raising and lowering the bed, a locking head on, the overhanging arm, a connecting support slidably mounted in the guide column, a tension tube mounted in the connect ing support having a threaded end adapted to be screwed into the locking head, and a spindle fixed in the guide column having a threaded end adapted to screw into the lower end of the tube. p

8. A milling machine, comprising a frame having an overhanging arm, a vertical guide column, a work-table bed slidably mounted on the frame and having a cylindrical end portion surrounding the column, means for raising and lowering the bed, a locking head on the overhanging arm, a connecting support slidably mounted in the guide column,

a tension tube mounted in the connecting osoAR OPPE.

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