US2123213A

US2123213A - Cutter chain

Info

Publication number: US2123213A
Application number: US117188A
Authority: US
Inventors: Leon E Simmons
Original assignee: Sullivan Machinery Co
Current assignee: Sullivan Machinery Co
Priority date: 1936-12-22
Filing date: 1936-12-22
Publication date: 1938-07-12
Anticipated expiration: 1955-07-12

Description

` July 12, 193s. L E, SIMMONS 2,123,213

CUTTER CHAIN Filed Dec. 22, 1.936 2 Sheets-Sheet 1 Filed Dec. 22, 1936 L. E.' SIMMONS 2 Sheets-Sheet 2 w MMM' Patented July 12, 1938 UNITED STATES CUTTER CHAIN Leon E. Simmons, Claremont, N. H., assignorto Sullivan Machinery Company, a corporation of Massachusetts Application December 22, 1936, Serial No. 117,188

9 Claims'.

This invention relates to cutter chains, and more particularly, but not exclusively, relates to improvements in mining machine cutter bits and bit holders.

An object of the present invention is to provide an improved cutter bit having a plurality of cutting points whereby when one cutting point becomes dull, another sharp point may be presented to the work.l Another object is to provide an improved cutter bit of the four-point type having a pair of spaced cutting points at each end of the bit body. A further object is to provide an improved holder for a cutter bit. A still further object is to provide an improved cutter chain having an improved chain block structure for receiving and supporting a reversible cutter bit whereby the cutter chain may be readily reversed simply by reversing the position of the cutter bit and the bit holding means with respect to the chain block structure. These and other objects and advantages of the invention will, however, hereinafter more fully appear. A

In the accompanying drawings there are shown for purposes of illustration several forms which the invention may assume in practice.

In these drawings, I

Fig. 1 is a side elevational view of a section of a cutter chain having embodied therein one illustrative form of the improved cutter bit and bit holding means. i

Fig. 2 is an end elevational view of the cutter chain shown in Fig. 1, with the strap links shown in cross section. Y

Fig. 3 is a fragmentary view in longitudinal section taken substantiallyon line 3-3 of Fig. 2.

Fig. 4 is a perspective view oi the improved cutter bit.

` Fig. 5' is a perspective view of the improved bit holder clamp.

Fig. 6 is a cross sectional view taken substantially on line 6 6 of Fig. 4.

Fig. '7 is a plan view of the chain block shown in Fig. 1.

Fig. 8 is a view similar to Fig. 3, showing a modiiied form of construction.

Fig. 9 is an end elevational view of the cutter chain shown in Fig. 8, with the strap links shown in cross section, and parts incomplete.

Fig. 10 is a perspective view of the bit holder clamp. i

Fig. 11 is a view similar to Figs. 3 and 8, showing still another modified form of construction.

Fig. 12 is an end elevational view of the cutter chain shown in Fig. 11, with the strap links shown in cross section, and parts incomplete.

In the illustrative construction disclosed in Figs. 1 to 7, inclusive, I designates a chain block and 2 the usual strap links, the latter pivotally Connected to the chain block by pivot pins 3. The chain block I has oppositely inclined front 5 and rear sockets `4 having their inner surfaces converging inwardly and communicating with a central opening 5. The front and rear walls of the chain block I are formed with threaded

openings

6 and 1, these openings being relatively in- 10 clined outwardly, and threaded within the front opening 6 is a clamping screw 8 for engaging a cutter bit holding clamp 9. The improved cutter bit has four cutting points lll, II, I2 and I3 disposed at the corners of a rectangle and has a body I4, two of whose sides follow sides of such rectangle, and which is deep-ly notched at I5 and I6 between the pairs of points respectively, at the opposite ends of said sides. In other words, the bit body I4 is formed at each end with `spaced projections, the inner `edges of which extend along lines converging at the longitudinal center of the bit, and parallel lateral edges, the inner converging edges of the projections and said parallel edges terminating in the cutting points I0, II, I2 and I3 at the extremities of the spaced projections. The converging sides of the notched portions of the bit body between the pairs of points form the forward cutting faces of the cutting points when the latter are supported in cutting position with respect to the chain block. The bit body, in this instance, is formed with parallel plane sides I1 and I8 and lateral edges I9 and 20, the plane sides connected with the lateral edges by means of curved surfaces 2|. When the cutter bit is placed in cutting position within the chain block sockets 4in the manner shown in Fig. 3, the cutting face of the rear inactive cutting point I2 engages, at 22, a surface on the chain block, while the face of the rear inner inactive cutting point I3 engages a` surface on the chain block at 23, and the forward portion of the edge 20 at the inner side of the bit rests against the inclined bottom surface of the front socket 4. In this illustrative construction, the 4r clamp 9 is formed with a rounded projection 24 in the form of a pivot seated within a socket formed in the forward face of the chain block, and the opposite end of the clamp is provided with a projection 26 overlying and engaging the face of the front inner inactive cutting point II of the cutter bit, so that at that time the outer front cutting point I D is active, with the bit body rigidly clamped within the sockets of the chain block. When the screw B is tightened, the clamp pivots about the point of engagement of the rounded projection with the socket 25 so that the clamping projection 26 is swung inwardly to clamp the faces of the cutting points |2 and I3 against the surfaces on the chain block and the forward portion of the edge 20 tightly against the bottom surface of the front socket 4. When the cutting point l0 becomes dull, the screw 8 may be loosened and the clamp swung upwardly so that the cutter bit may be Withdrawn from the chain block sockets and may be turned laterally edge for edge to present the sharp cutting point in active cutting position, the face of the rear inactive cutting point I3 at that time engaging the chain block at 22, while the face of the rear inactive cutting point I2 engages-the chain block at 23, and the edge I8 of the bit adjacent the front inactive cutting point I0 engages the bottom surface of the front socket 4. Thereafter the clamp may be placed in proper clamping position with respect to the bit and the screw 8 tightened to clamp rigidly the bit in place on the chain block. As the cutting points become dull, the cutter bit may be turned sidewise and end for end until all of the four cutting points have been used. After the cutting points all become dull, the cutter bit, due to its relatively inexpensive design, may be discarded and replaced with a new bit, thereby eliminating the necessity of re-sharpening and the expense involved in the provision of re-sharpening equipment. The position of the cutter bit and its holding means may be reversed with respect to the chain block by releasing the screw from the threaded opening 6 and reversing the position of the clamp with respect to the chain block so that the clamp engages a socket in the rear face of the block and the screw is threaded within the other opening 1. The position of the cutter bit is then reversed within the socket with respect to the chain block and, thereafter, upon tightening of the clamp, the bit is rigidly held in position, and when all the bits are reversed it is possible to operate the cutter chain in a reversedirection. Y A

In the modied form of construction shown in Figs. 8 to 10, inclusive, Vthe cutter bit is identical to that shown in Fig.` 4. In this instance the chain block 30 is formed with a longitudinal bore 3| for receiving a clamping bolt 32 having a forward clamping head 33. The rear end o f the clamping bolt is threaded at 34 for the reception of a tightening nut 35. In this instance, the front and rear

chain block sockets

4, 4 communicate with the central opening 5 and the latter in turn communicates with the longitudinal bore 3|, and the clamping bolt 32 is formed with a longitudinal slot 36 for receiving the inner inactive cutting point of the bit in Athe manner shown. The clamping head 33 has aclamping projection 31 engaging the face of the inner inactive forward cutting point of the bit,r in a manner similar to the projection 26 of thefclampfl in the form of the invention above described, for clamping the bit in cutting positionl within the front and

rear sockets

4, 4 of the chain block with the outer forward cutting point of the bit in active cutting position. In this instance, the clamping head has a plane inner surface 38 engaging a corresponding plane surface 39 on the chainrblock for maintaining the clamping bolt against rotative movement with respect to the chain block. As in the form of the invention above described, the faces of the rearward inactive cutting points engage surfaces on the chain block at 22 and 23, with the forward portion of the inner bottom edge of the bit body engaging the inclined bottom surface of the front socket 4. When it is desired to reverse the position of the cutter bit with respect to the chain block, the clamping bolt may be turned end for end within the bore 3| and the bit reversed within the chain block` sockets, and thereafter the bolt tightened to clamp the bit in its reversed position on the block. When the active cutting point of the bit becomes dull, the position of the bit may be changed within the chain block sockets, as in the form of the invention above described, so as to present a sharp cutting point to the work.

In the modified form of the invention shown in Figs. 11 and 12, the cutter bit and the chain block sockets are the same as those above described in the other forms of the invention. In this illustrative construction the chain block 43 has a longitudinal bore 4| internally threaded to receive a clamping screw 42. As in the forms of the invention above described, the front and

rear sockets

4, 4 communicate with the central opening 5; and the latter in turn communicates with the longitudinal bore 4|. The head of the screw engages a clamp 43 having a clamping projection 44 engaging the face of the forward inner inactive cutting point of the bit for clamping the bit in the chain block sockets in the same manner as that above described in the other forms of the invention. The rear inner inactive cutting point of the bit extends through the central opening 5 within the longitudinal bore at that time, in the manner shown in Fig. 11. The clamp 43 has a plane inner surface 45 engaging a corresponding plane surface 46 on the chain block for preventing lateral displacement of the clamp during the clamping operation. As in the forms of the invention above described, the clamping screw, clamp and bit may be reversed with respect to the chain block so that the bit may be clamped in reverse cutting position on the block, the screw 42 at that time being released from the front portion of the threaded bore and inserted in the opposite end of the threaded bore, with the clamp arranged at the opposite end face of the chain block. The cutter bit may similarly be re-positioned within the block sockets to present a sharp cutting point to the work when the previously acting cutting point becomes dull.

As a result of this invention, it will be noted that an improved cutter chain is provided having an improved cutter bit and improved cutter bit holding means. It will further be noted that an improved cutter bit is provided having a plurality of cutting points, two points on each end of the bit body, and having associated therewith improved supporting means whereby the bit may be supported in four different operative cutting positions. It will also be evident that by the provision of the improved bit holding structure, the cutter bit may be held in reversed cutting position on the chain block, thereby to enable the cutter chain to operate' in either of opposite directions. Other uses and advantages of the improved cutter chain will be clearly apparent to those skilled in the art. f

While there are in this application specifically described several forms which the invention may assume in practice, it will be understood that these forms of the same are shown for purposes of illustration and that the invention maybe further modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

Cil

What I claim as new and desire to secure by Letters Patent is:

1. In a cutter chain, a chain block having a socket, a double-ended cutter bit having pairs of cutting faces terminating in cutting points, with two cutting points at each of the opposite ends of the bit, said bit receivable in said socket, the faces of the rearward inactive cutting points of the bit engaging surfaces on the chain block and the forward portion of the inner edge of the bit body engaging the inner surface of said socket, and means carried by the` block and engaging the bit for securing the bit in cutting position Within said socket.

2. In a cutter chain, a chain block having a socket, a double-ended cutter bit having pairs of cutting faces terminating in cutting points, with two cutting points at each of the opposite ends of the bit, said bit receivable in said socket, the faces of the rearward inactive cutting points of the bit engaging surfaces o-n the chain block and the forward portion of the inner edge of the bit body engaging the inner surfacel of said socket, and means carried by the block and engaging the bit for securing the bit in cutting position within said socket with its forward outer cutting point in active cutting position, said securing means engaging said bit in advance of said active cutting point.

3. In a cutter chain, a chain block having a socket, a double-ended cutter bit having pairs of cutting faces terminating in cutting points, with two cutting points at each of the opposite ends of the bit, said bit receivable in said socket, the faces of the rearward inactive cutting points of the bit engaging surfaces on the chain block and the forward portion of the inner edge of the bit body engaging the inner surface of said socket, and means carried by the chain block and engaging the face of the forward, inner, inactive cutting point of the bit for securing the bit in cutting position Within the chain block socket.

4. In a cutter chain, a chain block having a socket, a double-ended cutter bit having pairs of cutting faces terminating in cutting points, with two cutting points at each of the opposite ends of the bit, said bit receivable in said socket, the faces of the rearward inactive cutting points of the bit engaging surfaces on the chain block and the forward portion of the inner edge of the bit body engaging the inner surface of said socket, and means carried by the chain block and engaging the face of the forward, inner, inactive cutting point of the bit for securing the bit in cutting position within the chain block socket with the forward outer cutting point in active cutting position, said securing means engaging the front inactive cutting point of the bit in advance of said active cutting point.

5. In a cutter chain, a chain block having a bit receiving socket, a double-ended reversible cutter bit having cutting faces terminating in pairs of cutting points with a pair of cutting points at each end of the bit body, said bit receivable in said block socket, the faces of the rearward inactive cutting points engaging surfaces on the chain block, and a clamp adjustably secured to the chain block and engaging the face of the inner, forward, inactive cutting point of the bit for clamping the bit within said block socket with 5 the forward outer cutting point in active cutting position.

6. In a cutter chain, a chain block having a socket and a longitudinal bore, a double-ended reversible cutter bit having cutting faces terminating in pairs of cutting points with a pair of cutting points at each end of the bit body, said bit receivable in said block socket, the faces of the rearward inactive cutting points of the bit engaging surfaces on the chain block, and a l5 clamping bolt receivable in said longitudinal bore and havingl a clamping portion engaging the face of the inner, forward, inactive cutting point of the bit for securing the bit in said chain block socket with the forward outer cutting point in active cutting position.

7. In a cutter chain, a chain block having a bit receiving socket and a longitudinal bore, said bore internally threaded, a double-ended reversible cutter bit having cutting faces terminating in pairs of cutting points with a pair of cutting points at each end of the bit body, said bit receivable in said socket, the faces of the rearward inactive cutting points of the bit engaging surfaces on the chain block, a clamp engaging the face of the inner, forward, inactive cutting point of the bit for clamping the bit within said socket with the forward outer cutting point in active cutting position, and a screw threaded within said longitudinal bore and engaging said clamp for adjusting the latter.

8. In a cutter chain, a chain block having a socket, a cutter bit having four cutting points and receivable in said socket selectively in four different cutting positions, said bit having a pair of rearwardly located surfaces engageable with spaced surfaces on the block at the rear end of said socket and a forward inner surface engag ing the inner surface of the socket, and means carried by the block and engaging a fourth surface on the bit for securing the bit in cutting position within said socket.

9. In a cutter chain, a chain block having a socket, a cutter bit having four cutting portions terminating in cutting points, whereby four cutting points are provided, and adapted to be placed successively in any one of four cutting positions upon the block, said bit insertible in said socket with one cutting portion projecting outwardly with its cutting point in cutting position, said socket having a pair of spaced surfaces engaging surfaces on two of said cutting portions rearwardly of said outwardly projecting cutting portion and a third surface engaging a side surface of the bit, and adjustable means on the block engaging a fourth surface, on the remaining cutting portion of the bit, to clamp the bit in cutting position in said block socket.

LEON E. SIMMONS. 05