US2918165A - Cutter guard - Google Patents

Description

Dec. 22, 1959 .J. H. PAULICK, JR

CUTTER GUARD Filed Dec. 31. 1956 mm N Z mm p a M M.

wm M! v /7 ATTORNEY CUTTER GUARD Joseph H. Paulick, Inn, Birmingham, Mich.

Application December 31, 1956, Seriai No. 631,549

3 Claims. (Cl. 206-116) This invention relates to a milling cutter guard for use during mounting and dismounting a cutter on a machine and for transporting and storing a cutter under protected conditions.

Various means or shields have been employed heretofore to attempt to protect multiple blade cutters, however, the several devices of the prior art have not proven entirely satisfactory inasmuch as they have fallen into disuse and the cutters are being presently protected in industry in wooden boxes and by wrapping them in cloths or rags.

With the foregoing in view, the primary object of the invention is to provide a milling cutter guard which is simple in design and construction, inexpensive to manufacture, easy to place on a cutter, and easy to remove from the cutter assembly.

An object of the invention is to provide a cutter guard having a split spring steel band for opening the band to receive a cutter therein and for the purpose of gripping the cutter via the spring tension of the band.

An object of the invention is to provide shoe portions on the band for forming a protective shroud relative to the cutter to protect both the radially extending and axially extending portions of the cutter blades.

An object of the invention is to provide tongues lanced out of the guard shoe portions for the purpose of mechanically interconnecting with the spring steel band so that it is not necessary to destroy the uniformity of the band by welding, riveting, or perforating and so that the shoe portions are slidably positionable on the bands so as to locate them accurately in spaced relationship in conjunction with various size bands.

An object of the invention is to provide shoe portions on the band Which are connected thereto via a flexible bond or connection.

An object of the invention is to provide tongue portions on the shoe portions interlocking with the band in forming a resilient bond between the shoe portions and the band so that it is possible for the shoe portions to move slightly relative to the band in expanding and in contracting the band so as not to bind the flexibility of the band and to permit homogeneous spring action in the band in opening and closing.

An object of the invention is to provide a cutter guard which constitutes stacking and holding means incident to the cutters in stacked relationship.

An object of the invention is to provide shoe portions on the cutters which are angled inwardly so as to eliminate interference between the shoe portions and to prevent a web being formed between the shoe portions in the dipping to place a plastic skin over the shoe portions and the band.

An object of the invention is to provide a plastic protective skin over the shoe portions and bands so as to provide a cushion for the cutter blades during transportation and storage and to provide a cushion for the workmans hands in handling the cutter such as in mounting and dismounting a cutter on a machine.

r 2,918,165 Patented Dec. 22, 1959 An object of the invention is to provide a plastic skin over the shoe portions and the band which interlocks with the band and shoe portions so as to hold the shoe portions relative to the band in properly spaced relationship thereto.

An object of the invention is to provide a plastic skin over the shoe portions and band which is capable of flexing and moving with the band and shoe portions.

These and other objects of the invention will become apparent by reference to the following description of a cutter guard or shroud embodying the invention taken in connection with the accompanying drawing in which:

Fig. 1 is a top plan view of a cutter guard embodying the invention.

Fig. 2 is a cross-sectional view of two cutters equipped with the inventive cutter guard in stacked relationship.

Fig. 3 is a perspective view of a portion of an inventive cutter guard showing the spring band and shoe connection prior to the application of the plastic skin.

Fig. 4 is a cross-sectional view of Fig. 3 taken on the line 44 thereof showing the tongues lanced from the shoe portion in the extended position prior to being pressed down over the band; and

Fig. 5 is a cross-sectional view of the guard similar to Fig. 4 showing a bonding agent fixing the shoe portion with the band portion.

Referring now to the drawing wherein like numerals refer to like and corresponding parts throughout the several views, the cutter guard disclosed therein to illustrate the invention comprises a spring band 10 which is split as at 11, shoe portions 12 having toe portions 13 and heel portions 14-, and a plastic skin 15 enveloping the band 10 and shoe portions 12 in a completely enveloping protective coating providing a cushion for both the cutter blades and the workmans hands.

More particularly, the spring steel band 10 is split as at 11 so as to be capable of expanding to receive a cutter and of then contracting to grip a cutter; the shoes 12 have an arcuate body portion 16 from which the tongues 17 and 18 initially are lanced outwardly thereof in the position seen in Fig. 4 prior to the insertion of the band 1%. The band 10 is inserted between the lanced out tongues 17 and 18 and the tongues are pressed down over the band so as to hold the shoe 12 on the band in proper relationship and it is to be noted that the shoes can then he slid along the band to evenly space the shoes relative to the band as seen in Fig. 1. This is an important eiement due to the fact that the size of cutters vary greatly so that it is necessary to size the band 10 to the cutter to which it is to be applied and then place as many shoe portions 12 thereon as possible without crowding or overlapping; in this connection it can be easily seen that the sliding relationship between the shoe 12 and the band 16 provides facility for easily, properly, and evenly spacing the shoes 12 relative to each other on the band so that it is not necessary to have different size shoes for different size cutters.

The guard seen in Fig. 5 employs a bonding agent 19 between the band 10 and the shoe 12 which may be of any metal bonding type such as Cycle-Weld which is sold commercially. Handles 21 can be fastened adjacent on the band 19 adjacent the split 11 as seen in Figs. 1-3, providing a hand grip for expanding the band in mounting the guard on a cutter 22 assembly. The shoe toe portions 13 are relieved or angled inwardly so as to avoid interference with one another and the heel portions 14 are also angled inwardly to avoid interference and so that in dipping no web forms between the various shoe portions.

It is also within the purview of the invention to provide a temporary bond such as the bond 19 between the shoes 12 and the band 10 for the purpose of holding the shoes on the band until after the dipping operation as it has been found that the plastic skin holds the shoe portions and band in an integrated assembly suitable for use especially when the band is disposed on the outside of the shoe body portions 16 so that the pressure of the band is transferred to the cutter 22 via the shoe portions 12.

In operation the workman spreads the handles 21 so as to open the split 11 sufficiently to receive a cutter 22 therein and upon the cutter being received the workman releases the handles 21 so as to permit the band 10 to contract and firmly grip the cutter 22. The cutters 22 may be stacked on their tops 23 as seen in Fig. 2 or stacked on their bottoms 24 with the inventive cutter guard providing a cushion seat. In this connection it is to be noted that the cutter guard toeportions 13 envelop the axially extending cutter portions 25 and that the heel portions 14 of the guard envelop the radially extending portions 26 of the cutter blades 27.

Although but a single embodiment of the invention has i been shown and described in detail, it is obvious that many changes may be made in the size, shape, detail and arrangement of the various elements of the invention within the scope of the appended claims.

I claim:

1. A guard for especially sharp, very heavy, hard to handle and protect, easily shattered and broken multiple blade milling cutters having blades circumferentially disposed with blade portions extending radially and axially, comprising a spring steel split band for circumferentially surrounding the radially extending cutter portions; said band having opposite edges, an inside face, and an outside face; shoes having a body portion disposed on the inside of said band adjacent to said band inside face so as to lie between said band inside face and a cutter; said body portion having opposed spaced sides normal to said band and opposed ends parallel to said band; tongues lanced from said shoe bodies on either side of said band opposite edges so as to extend over said band opposite edges; said tongues being bent down over said ,band outside face so as to interlock said shoes on said hand; said shoe bodies being circumferentially slidable relative to said band to facilitate spacing; toes on one end of said shoe bodies extending radially inwardly so as to overlie a cutters axially extending blade portion, heels on the other end of said shoe bodies extending radially inwardly so as to overlie a cutters radially extending band portion; said shoe bodies, toes, and heels being capable of gripping a cutter under the pressure of said spring band; resilient, protective, plastic material disposed over all said parts in an enveloping coating so as to prevent said shoes circumferentially sliding relative to said band, to provide a protective cushion for cutter blade sharp edges, to provide a protective cushion for a workmans hands, and to permit co-action and parts movement relative to opening and closing of said split band; said split band and associated shoes and coating being capable of being sprung outwardly open to receive a cutter and capable of resiliently closing to hold a cutter.

2. In a device as set forth in claim 1, said toe and heel portions being angled off substantially parallel to radii so as to avoid interference.

3. In a device set forth in claim 1, handles adjacent said band split for opening said band.

OTHER REFERENCES Plastics (publication) pages 48, 49, and 98, 1944.

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