US1765172A

US1765172A - Rotary cutter

Info

Publication number: US1765172A
Application number: US155918A
Authority: US
Inventors: Frank P Miller
Original assignee: Individual
Current assignee: Individual
Priority date: 1926-12-20
Filing date: 1926-12-20
Publication date: 1930-06-17
Anticipated expiration: 1947-06-17

Description

June 17, 1930.

Filed Dec. 20. 1926 Patented June 17, 1930 FRANK PfMILLnn, kor Mnnnvrniin, .PENNSYLVANIA Liao'riiiaa' currnn Y Application filed December 20, 19,26. Serial No.V l55,918. i'

This invention relates to tool holders and more particularly to a means to secure the blades in place in such a manner that end or other thrust thereon is eliectivelyj re-y sist-ed.

Another and equally important object is te provide a tool holder in which the blade tightening devices, which in this case, happen to be in the nature of set screws are highly accessible for adjustment.

@ther objects and advantages will be apparent during the course ot the following description.

Figure 1 is a sectional perspective of a cutter embodying the invention.

Figure 2 is a detail transverse sectional view through the same.

Figure 3 is a detail longitudinal sectional view through the cutter.

Figure 4l is a sectional view illustrating a slight modiiication of the invention.

In the drawing wherein for the purpose 0i' illust-ration is shown a preferred embodiment of the invention the numeral 12 designat-es the body of the cutter, which body is formed with an annular series of longitudinal slots 14 for the reception. of blades 15 inspection of Figure 2 will plainly show that the side walls of the slots and the side walls of vthe blades may converge toward the periphery of the body to inhibit radial movement of the blades when the same have been adjusted in the manner to be disclosed.

Attention is now invited to Figure 1 which illustrates that the body 12 is centrally recessed as indicated at 9 to permit pressure screws 16 and 17 to be threaded through previously formed radial openings in the body. Figure 3 clearly illustrates that the pressure screws 16 and 17 are adapted to have pressure engagementy with the inner edges of the blades l5 so "that the bla( es are forced outwardly into binding engagement with the converging side walls ofthe slots. v

t is important to note that the inner edge of each blade is extended outwardly to intersect the line of thrust on the blade. Thus the inner pressure screw 17 must be eX- tended outwardly a greater dist-ance than the pressure screw 16 to cooperate with the pressure screw 16 in forming an outwardly inclined bearing surface or seat for the blade 15. As'each blade restsy on an ,outwardly inclined seat defined by the pressure screws 16 and 17 endwise shifting` of the blade under the influence of the thrust thereon is avoided. ln explaining this Vit is pointed out that in setting the blades the pressure screws are tightenedv to'causefthe blades to have iirm binding engagement with the side walls of the slots so that radial movement of thel blades isinhibited. The angular disposition of the seat for the blades positively i prevents the blades fro'mshifting endwise in one direction without movingoutwardly and since such .outward movementis inhibited there' can'be no endwise movement under the influence of the thrust. y

The particular means illustrated for holding the blades :in place are capable ci ready adjustment and are also capable of being `quickly released so that the blades may be detached or reset, all of which adds to the utility and acceptability of the cutter."

AIn the torni of invention illustrated in Figure-i shim or spacer lstrip 20' maybe interposed between the inner edge of the blade and the kinclined seat dened Vby the spaced pressure screws'l and 17.

Having thus described the invention,

what is claimed is: n i

1. In a rotary cutter, a body having a slot provided with a bottom wall and converging side walls,

a blade adjustable endwise in saidslotand havin@ an inner lon i- C tudinal edgeet an angle to the opposed bottom wall of the slot, an adjustable abutment wedging means embodying pressure screws engaging the angularly disposed inner edge of the blade spaced points 'and forcing the blade outward into binding engagement with the converging side walls of the slot thereby cooperating with `said converging side walls in inhilitingendwise shifting of the blade. A

2. A rotary cutter comprising a centrally recessed annular body having slots provided with converging side walls, blades adjustable in sait slots and having the inner lor Cil tudinal edges thereof inclined outwardly toward the rear ends of the blades, and pairs of pressure screws threaded through said body and extending into said slots to form seats for said blades, one pressure screw of each pair being extended a greater distance into the slots than the other pressure screw of that pair whereby the seats for the blades are inclined to cooperate with'said converging side walls in inhibiting endwise shifting of the blades, said pressure screws being provided with heads positioned within the recessed portion of ysaid body.

V3. A rotary cutter comprising a centrally recessed annular body having slots provided with converging side walls, blades adjustable longitudinally in said slots, pairs of radially disposed pressure screws threadedy through said body and extending into said slots to form seats for said blades', one pressure screw of each pair being extended a greater distance into the slots than the other pressure screw of that pair whereby the seats for the blades are inclined longitudinally to cooperate with said converging side walls in holding the blades in place against the thrust thereon, said pressure screws being extended into the centrally recessed portion of said body, and shims between said pressure screws and said blades. Y

et. In a rotary cutter, a body having a slot provided with converging side walls, a blade adjustable endwise in said slot and an inner longitudinal edge at an angle to the bottom wall of the slot, pressure screws extending into said slot and engaged at spaced points with the inner edge of said blade and forcing the blade outward into binding en-` gagement with the converging side walls of the slot thereby cooperating with said converging side walls in inhibiting endwise shifting of the blade under the influence of the thrust thereon, said pressure screws having threaded engagement with the body and being provided with separately engagable heads.

5. In a rotary cutter, a body having a slot extending substantially parallel to the axis thereof, a blade adjustable endwise in said slot and having the inner edge thereof extended outward at an angle to the axis of the body, pressure screws engaging said inner edge of said blade at spaced points and forcing the blade outward, said side walls being provided with means limiting outward movement of the blade thereby cooperating with said pressure screws in inhibiting longitudinal shifting of the blade in the directionV in which the blade is prone to move under the influence of the thrust thereon.

6. In a. rotary cutter, a body having a slot provided with a bottom wall and converging side walls, a blade adjustable endwise in said slot and having' an inner longitudinal of the blade under the infiuence of the thrust ,75

thereon. f f

In testimony whereof I affix my signature.

FRANK P. MILLER.

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