US1756986A - Inserted-blade cutter - Google Patents

Description

May 6, 1930. F. P. MILLER INSERTED BLADE CUTTER Filed May 16, 1925 INVENTOR LZZe/t W ATTORNEY Patented May 6, 1930 UNITED STATES.

FRANK P. MILLER, 01 MEADVILLE, PENNSYLVANIA.

msn n'rnn-nmnn Curran Application filed May 16,

This invention relates to inserted blade rotary cutters, and has for an important object the provision of simple means whereby the blades may, upon insertion, be quickly and Bsecurely locked against endwise or outward shifting.

A further object of the invention is to provide a rota cutter of the inserted blade type which is o highl simplified construction,

10 easy to adjust and comparatively cheap to manufacture.

Other objects and advantages will be apparent during the course of the following description.

In the accompanying drawing forming a part of this application, and in which like numerals are employed to designate like parts throughout the same, I

Fig. 1 isa fragmentary perspective of a 90 milling cutter embodying the invention;

Fig. 2 is a detail sectional view through the milling cutter;

Fig. 3 is a group perspective of a blade and the holding means therefor;

Fig. 4 is a detail transverse sectional view illustrating a slight modification of the invention;

Fig. 5 is a fragmentary plan view through the form of invention illustrated in Fig. 4;

Fig. 6 is a roup perspective illustrating the blade holding members for .use in connection with the form of invention shown in Figures 4 and 5. I

In the drawing wherein for the purpose of illustration are shown several preferred embodiments of the invention, the numeral 5 designates a body having an annular series of slots 6 for the reception of blades 7, the blades being ground in any referred manner to produce the desired e ge.

In carr ing out the invention, one side wall of each 5 0t 6 is provided with a transverse groove 8 tapered toward the outer end thereof and receiving an approximately semi-cir-. cular wedge block 9. The flat face of the tapered wed e member 9 is toothed or serrated, as indicated at 10, for locking engagement with the teeth or serrations 11 in the opposed face of the blade 7. The engage- 50 ment of the serrations 10 and 11 positively 1925. Serial No. 30,783.

holds'the blade against endwise shifting and by reference to Figure 1, it will be seen that the teeth 11 extend beyond the sides of the block 9 to provide for adjustment. Figure 3 illustrates that the teeth 11 are continued to the inner edges of the blade to permit of the insertion and removal of the blade.

Each semi-circular block 9 has a threaded opening for the reception of a locking screw 14, the inner end of which is pointed for engaging the intermediate portion of a locking member in the nature of a pin 16. Figure 2 clearly illustrates that the locking pin 16 which is positioned in a groove 18 in the blade and in a recess 22 in the block 9, is forced into binding on agement with the wall of the roove by t e screw 14 whereby to lock the blade in lace.

It will e seen that the tightening of the screw 14 will force the lockin pin 16 into binding engagement with the lade and at the same time will force the tapered wedge block 9 outwardl into binding engagement with the blade w ereby a double lockin effeet is brought about to positively hol the blade against shifting, either endwise or edgewise.

The pin 16 may be inserted by way of the groove 24 disposed at right angles to the groove 8 and communicating with the same.

s the groove 24 extends out through both sides of the body 5, the pin may be inserted from either side.

Attention is directed to the fact that the screws 14; are provided at the outer ends thereof with grooves oi other suitable tool engaging means whereby the screws may be conveniently turned. In other words, the accessibility of the tightening or wed ing 7 screws 14 makes it a simple matter to ad just 90 the improved rotary cutter as the occasion requires.

f'Figure 2 plainly illustrates that the screw *14 serves the dual purpose of forcing the pin 16 into binding engagement with the blade to hold the blade against outward shifting and forcing the wedge'block 9 outwardly and laterally into binding engagement with the blade 7 In the form of invention illustrated in Figures 4 to 6 inclusive, the wedge block 90 which is in the form of a semi-circle is provided with a slot 91 for the entrance of a comparatively short locking pin 92 which may be forced into engagement with the blade 93 by means of the locking screw 94 threaded into the a tapered block 90. The pin 92 upon being passed through the slot 91 is received in a longitudinal groove in the opposed side of the blade. This form of invention is especially adapted for use in a reaming bar where it is not convenient or possible to insert the locking pin from one end of the bar.

Attention is especiall directed to the fact that the slotting of the lock 90, as indicated at 91, cannot result in the spreading of the block for the reason that the engagement of slot 91 does not destro the serrations 96 at opposite sides of the slot with theserrations on the opposed side of the blade 93 "prevent this. In other words, the

or reduce the effectiveness of the wedge b ock. v

- blade and hold the same in adjusted position.

a and engaging and forcing the a block carried thereby,

:2. A cutter comprising a body, a blade and a pin engaged with the blade, and a screw carried by the block (pin into binding engagement withthe bla e and simultaneously forcing the block outwardly, there being means whereby the block is moved latorally into flat and uniform pressure engagement with the blade to brace the blade and hold the same in adjusted position, said block being provided with means opening out through one side thereof for the receptionof said pin.

3. A cutter comprising a body, a blade and a block carried thereby, a pin engaged with =tbe blade, and a screw carried by the block and engaging and forcing the pin into binding engagement with the blade and simultaneously forcing the block outwardly, there being means whereby the block is moved laterally into fiat and uniform pressure engagement with the blade to brace the blade and hold the same in adjusted position, said block being provided with a recess opening out throu one end thereof and adapted for the insertion and removal of said pin.

4. A cutter comprising a body, a blade. and a block carried thereby and having the opposed surfaces thereof provided with intertting serrations, a locking member engaged with the blade, and a screw having threaded engagement with said block and having the forward end thereof tapered for engaging and forcin the locking member inwardl and lateral y into binding engagement wit the blade and simultaneously forcing the block outwardly, there being means whereby the block is moved laterally into uniform pressure engagement with the blade to brace the blade and hold the same in adjusted osition. 5. A rotary cutter having a slot and a trans verse groove in one wall of said slot, a blade in said slot, a block received in said groove and having a slot opening out througn one side thereof, a pin in said slot and said block and adapted to engage said blade, the slot in said block forming a passage I01,S8ld pin, and means carried by said block to force the pin into locking engagement with said blade and to force the block into binding engagement with said blade.

6. The construction set forth in claim 5, said block and said blade being provided with interfitting serrations to hold the blade in place and to hold the block against spreading.

7. In a cutter, a bod having a slot, one side of which is forme with a groove having a smooth tilted wall, a blade in said slot, 2. block in said groove, and a screw having threaded engagement with said block to urge the block endwise in one direction into uniform pressure engagement with the tilted wall of the groove and the opposed side of the blade, there being means responsive to the screw pressure to urge the blade in the direction opposite the endwise direction in which the block is urged.

In testimony whereof I aflix my signature.

FRANK P. MILLER.

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