US 1423511 A
Description (OCR text may contain errors)
J. N. BAKER.
CATION FILED J'ULY 31,1918.
Patented July 25, 1922.
.UIUIINIINIIUIIIII Mba UNITED STATES PATENT OFFICE. I
l'AMES N. BAKER, OF BROOKLYN, NEW YORK, ASSIGNOR TO R. HOE AND C0., OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.
Specification of Letters Patent.
Patented July 25, 1922.
Application filed July 31, 1918. Serial No. 247,471.
To all whom t may concern:
Be it known that l, JAMES N. BAKER, a citizen of the United States, residing at 363 Lenox Rd., Brooklyn, county of Kings, and State of New York, have invented certain ne-w and useful Improvements in Routing Tools, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.
This invention relates to certain improvements in routing tools employed for routing or finishing electrotype, stereotype and other printing plates, and the invention relates particularly to an improved holder for the cutting tools by which the routing is effected.
It is the especial object of the invention to provide a tool of simple construction and design which may be driven by a high speed motor actuate-d by either alternating or direct current, and in which provision is made for controlling the motor speed to prevent the motor from running away when there is no load on the tool, and in which provision is also made for cooling the motor, and for providing and directing an air blast or air current at the tool point so that the work is kept clear of chips, this being especially desirable in routing tools where the tool is constantly moved from place to place on the work surface.
A further object of the invention is to provide a construction for effecting this purpose, which is self contained. that is, in which all the operative parts are assembled to produce a unitary structure, which can be readily moved from place to place on the work, as required.
With these and other objects not specically referred to in view, the invention will now be fully described in connection with the accompanying drawings, in which Figure 1 is ahvertical section of the improved routing tool holder.
Figure 2 is a plan view partly insection showing the fan, the view being taken on line 2-2 of Figure l1. y
Figure 3 isa side view partly broken away of the cover or casing for the holder illustrating a method of supplying air to the holder; and
Figure 4 is a diagrammatic view on a reduced scale showing one method of mounting the holder with relation to the work.
Referring now to the drawings, the routing tool 1, which may be of any suitable character, is shown as clamped to a vertical tool shaft 2 by a rotary clamping device 3, of any usual or suitable character to enable the tool to be readily placed on or removed from the holder.
Devices embodying the invention in its preferred form, will include a holder in which the operating parts of the device are carried so as to produce a compact unitary structure, and this holder will, furthermore, be designed so that a current of air may be directed through the holder for cooling the driving means, and so that a current of air will be directed to the tool point so as to keep the work clear of chips. While the specific construction of this holder may vary somewhat, in the particular construction illustrated, there is provided a casing 4, preferably circular, which at its lower end has secured thereto a bottom 5, formed with a projection 6, in which is formed a bearing for one end of the driving shaft 2, before referred to. This driving shaft 2 extends through the casing and takes its bearing at the other end in a bearing block 7, carried in a top plate 8, secured to the casing 4 in any suitable manner as by screws 9 taking into a flange 10 formed on the upper end of the casing. The driving shaft 2 isdriven by a high speed motor operated either by a direct or alternating current. The armature of this motor is secured to the drivingshaft, and is indicated generally by the numeral 11, the field beingr indicated by the numeral 12. The top of the casing is enclosed by a perforated cap plate- `13, this cap plate fitted over the plate 8, before referred to, a space 14 being left between the cap plate 13 and the plate 8 for effecting ingress of air, as hereinafter referred to.
In accordance with the invention, means are provided for effecting the cooling of the motor, and for directing a current of air to the point of the tool. In this class of machines, it is desirable also that controlling devices be provided for preventing the motor from running awa-y when the tool is removed from the work, and the ,motor load ceases. In machines embodying the invention in its best form.',' a' common. means will be employed for effecting the cooling and controlling of the motor and for directing an air current to the tool point. Vhile the specific means may be varied, as illustrated there is provided a. fan 15, which is secured to the driving shaft 2 and operating in a compartment formed between the bottom wall 5 of the casing and a plate 16, provided with a central aperture 17, through which the fan may draw air. This fan may be of any usual or suitable type, but in the par ticular construction illustrated, it comprises upper and lower supporting flanges 18, 19, between which are formed wings 20. The rotation of this fan acts to draw a current of air through the perforated cap 13 and space 14, before referred to, down through the casing around the motor armature, thus keep ing the armature cool and the resistance offered by the fan, furthermore, acts to control the speed of the motor and keeps it from running away when the tool is removed from the work, and there is no load on the motor.
The fan 15, also, acts to produce a current of, air, this air current bein directed adjacent the working point of t e tool so that it keeps the work free of chips about the tool point. While this may be effected in various ways, in the preferred construction, the casing 4 is provided with a port 21 which leads to a nozzle 22 secured to the Wall of the casing, the delivery end of this nozzle `being extended downwardly and inwardly so that the air current is delivered closely adjacent to the working end of the tool and obliquely to the tool, whereby the chips are effectively blown away froml the tool point, and the operator is enabled to clearly see the work.
The toolmay be handled by the operator in any desirable fashion, depending on the work employed. If desired, however, the tool may be mounted on the Work support so that it can be readily removed toany part of the work desired. One such method of mounting the tool is illustrated in Figure 4 of the drawings, in which there is provided an arm 23 pivoted at 24 to the work support 25. This arm 23 has pivotally secured thereto at 26 a tool carrying arm 27, to which the tool is clamped at 28, in any suitable manner, the tool beingguided to the work by operating handle 29.
.While the invention has been illustrated in what is considered its most practical form, it will be understood that within the scope of the claims various changes may be made in the specific construction and arrangement of the parts without departing from the ing ventlon. r
What I claim is.
1. In a routing tool, the combination with a tool carrier, means for driving the carrier, a. fan driven by the carrier, driving means for producing a currentof air, and enclosed connections leading from the fan to the Working end of the tool whereby an air current is directed to the tool point and the point kept free from chips.
2. In a. routing tool, the combination of a casing, a motor mounted therein, a tool shaft taking bearings in the casing and driven from the motor, a perforated top for the casing, a fan located in the casing at the bottom thereof for producing an air current through the casing, and a nozzle leading from the fan to the tool point for directing the produced air current t0 the point of the tool.
3. In a routing tool, the combination of a casing, a motor mounted therein, a shaft driven from the motor taking bearings in the casing, a fan in the casing driven from the shaft, a nozzle leading from the fan to the tool point, and means for pivotally supporting the casing.
In testimony whereof, I have hereunto set m hand.
y JAMES N. BAKER.