Routing device

Application filed November 15, 1927. Serial No. 233,501.

This invention relates to an improved form of portable routing machine and has for an object the provision of means for quickly and . accurately regulating the depth of cut of the 5 routing tool.

Another object is to provide a machine of this type which is especially adapted for facile operation and accuracy in guiding it over a pattern plate.

M) . Another object is to provide a simply adjusted and readily reversible pattern plate for use with routing machines.

These and other objects are attained by the ... means described herein and disclosed in the 15 accompanying drawings, in which:—

Fig. 1 is a perspective view of a routing machine of the invention having embodied therein the novel cut depth adjustment means . . and the means for manipulating the device ²⁰ of the invention.

Fig. 2 is a fragmental view of the reverse side of the device shown in Fig. 1.

Fig. 3 is a cross sectional view taken on line 3—3 of Fig. 1.

⁸⁸ Fig. 4 is a fragmental view of a part of the structure shown in Fig. 1 disposed in position for effecting a setting of the cut depth of the routing tool.

Fig. 5 is a plan view of a reversible guide 30 plate structure of the invention in operative position upon a piece of work.

Fig. 6 is a view taken on line 6—6 of Fig. 5.

Fig. 7 is a view taken on line 7—7 of Fig. 5.

Fig. 8 is a view taken on line 8—8 of Fig. 7.

³³ Fig. .9 is a view similar to Fig. 8, showing a holding means for the guide plate in reversed position.

The device comprises a suitable driving unit 12 which preferably takes the form of a ⁴⁰ vertical electric motor having a housing 13 adapted to be vertically adjusted and clamped in a receiver frame 14 supported in spaced relation to a centrally apertured base 15 by suitably spaced legs 16. A clamp for the motor housing 13 is conveniently formed by splitting or slotting through the receiver 14 as indicated at 17 and providing perforate and suitably threaded lugs 18 on each side of the slot. A clamping screw 19 extends through the bosses and serves to draw the receiver body into clamping relation about the housing 13. On the side of the receiver frame 14 opposite the clamping lugs 18 is a preferably integral boss 20 which is disposed substantially at right angles to the 55 shaft and motor 12. The boss 20 has a bore 21 adapted to receive a shaft 22 having an annular recess 23 intermediate its ends and which.is furthermore provided adjacent one end with the pinion 24 which meshes with a 60 rack 25 suitably secured to the motor housing 13. The extreme end 26 of shaft 21 has a reduced portion thereon which is journaled in a reduced bore 27 co-axial and communicating with the bore 21. At its opposite end 65 the boss 20 has an enlarged counter-bore 28 for receiving a fixed stop pin 29 which is threadedly mounted in the body of the boss 20. Set screw 30 projects through the wall of the boss 20 into the annular groove 23 and ⁷⁸precludes displacement of the shaft 21, thereby insuring accurate meshing of pinion 24 with the rack 25. A collar 31 is rotatably mounted on the shaft 21 and has its innermost face 32 riding in substantial abutment ⁷⁶with the end face 33 of lug 20 and carries about its circumference suitable scale markings 34 any of which may be brought into matching alignment with line 35 on the adjacent end of the boss 20. A pin 36 on the face ⁸⁰32 of the collar 31 projects into the counterbore 28 in the boss and is adapted to abut the stop pin 29. A handle knob 37 is splined on the outer end of shaft 21 so that it is always in driving engagement with it but may be ⁸⁵retracted away from the collar 31 by pulling it outwardly against the resistance of spring 38. which normally holds the knob n gain st, said collar. The collar and knob are provided on their abutting faces with intermesh- ⁹⁰ing teeth 39 and 40 so that under normal conditions the knob and collar may be rotated as a unit for raising and lowering the housing .13 and thus raising and lowering the routing tool 41 which is suitably received in ⁹⁵a chuck or clamping collar 42 on the lower end of the motor shaft. From the foregoing description it will be noted that knob. 37 may be rotated, carrying with it the collar 31 to bring the pin 36 into abutment with the ¹⁰⁰

1,874,233 stop pin 29 to a limit of depth feed. Withdrawal of the stop pin 29 will permit continued descending movement upon turning of knob 37. The stop pin may then be pro5 jected into position. The knob 37 is then withdrawn sufficiently to release the collar 31 which may then be manually rotated without disturbing the adjustment of the motor housing and routing tool in order to align 10 the zero mark on the collar (indicated by anarrow) with the mark 35 on the boss. The knob 37 and collar 31 are again brought into intermeshing engagement whereupon the depth of cut may be accurately adjusted by 15 turning the knob and collar as a unit to register the proper pre-determined mark 34 on the collar with the mark 35. Likewise it will be noted that adjustment may be made in the following manner. The various routing tools 20 are often of different lengths so that the initial contact with the surface of the work will normally register differently on the indicating means. To effect a predetermined cut of a given tool, the tool is inserted and lowered 2® to touch the work by turning the knob 37.

The knob is then released by withdrawing it and collar 31 is turned to zero. The knob is again permitted to engage the collar whereupon the two as a unit are turned the desired ²⁰ number of markings (which conveniently represent 1/16 of depth cut) whereupon the clamping lever is actuated and the tool is accurately held to a predetermined depth of cut for the given routing bit. From the fore-. ³³ going it will be noted that by resting the bottom face of routing tools, which may be of different lengths, upon a surface to be worked upon it is possible to rapidly attain an actual zero position for the routing tool ⁱ⁰ and to then immediately adjust the collar 31 to a zero position from which the depth of the cut may be obtained by turning the knob 37, the exact depth being indicated by the number of markings from the arrow mark or zero mark 340 on the collar and the mark 35 on the boss. It will be understood that the depth of cut: of the routing tool is measured perpendicularly downwardly from the plane of the bottom face of base 15. As shown in ⁵⁰ Fig. 1 the device is provided with a handle member 43 which is disposed in a substantially horizontal plane spaced sufficiently above the base 15 to enable the operator to grasp and manipulate the device over a piece of ⁵⁵ work without injury to the hands, and sufficiently spaced from the central aperture 44 to permit of clear vision of the tool 41 operating therethrough. The handle 43 may be formed integrally with the base 15 and re⁶⁰ ceiver 14 in which case it is supported by integral arms 45 extending from the base. In order to permit an operator to use the device, to best advantage the handle member 43 is made polygonal for the purpose of prevent⁶⁵· ing accidental slippage of the handle in the.

hands of an operator as sometimes occurs when the hands or the handle become greasy. A suitable connector box 46 conveniently carried by the side of the receiver 14 has a switch 47 associated therewith for controlling 70 electric current supply from a. suitable flexible conductor 48 to the motor 12.

As will be noted in Fig, 1 the routing tool 41 has an accurately machined cylindrical guide bearing 49 having a narrow flange 50 at 75 the top thereof providing a right-angled shoulder. This guide bearing co-operates with a suitable pattern plate or templet for effecting the desired linear movement of the routing tool. ⁸⁰