US1492425A - Chaser holder - Google Patents

Description

April 29, 19z4 1,492,425

C. G. CASHMAN CHASER HOLDER Filed Feb. 21, 1920 atented Apr. 29, 1924. i

UNITED u STATES PATENT OFFICE.

CLARENCE G.CASHMAN, OF WAYNESBORO, PENNSYLVANIA, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, T0 LANDIS MACHINE COMPANY, 0F WAYNESBOEO, PENNSYLVANIA, A CORPORATION 0F PENNSYLVANIA. y

CHASER HOLDER.

Application led February 21, 1920. Serial No. 860,464.

To all whom z't may concern:

Be it known that I, CLARENCE G. CASH- MAN, a citizen of the United States, resid-y ing at Wa nesboro, in the county of Franklin and tate of Pennsylvania, have invented certain new and useful Improvements in Chaser Holders, of which the following is a specification.

My invention relates to improvements in Chaser holders and particularly to details of construction thereof,

The Chaser holders now in use are provided with beveled or dovetailed locating channels on the chasers to seat upon angular or dovetail channels on the holders, and the chasers also are provided with clamping shoulders or dovetails adapted to be engaged by one edge of a Clamp or lock bar, the other edge of which engages in a clamp angle or lock bar channel formed in the Chaser holder. 'Ihis construction is such that great pressure is necessary on the clamp or lock bar to hold the Chaser from lateral movement, due to the small amount of frictional Contact furnished by the locking elements. f

It is one of the objects of my invention to simplify the locking ofgthe Chaser so that a minimum of pressure is necessary on the locking bar to maintain the Chaser in an immovable position.

In carrying out this part of my invention, I increase the frictional contacting surfaces of the Chaser and lock bar by forming a series of longitudinally extending serrations thereon whichrit into corresponding serrations cut in a parallel plane on the Chaser holder or block.

A further object of my invention is to improve the construction of the Chaser adjusting means. The disadvantage of the resent type is that after the Chaser has Eecome worn and is ground ed and is comparatively short the screw has moved alongv into the screw way so far that the head is not exposed and it is necessary to use a screw driver to make adjustments, and also renders it necessary in changing from a short Chaser to a long one, to retract the screw through all of the distance it has traversed, which obviously takes a great deal of time and trouble.

In carrying out this part of my invention I provide a screw carrying stop or block mounted upon a spindle adapted to enter one of a series of openings or holes in the path of travel of the Chaser. The end of the screw bearing on the rear end of the Chaser, and large adjustments being made by advancing the stop or blockI from one hole to another.

In the accompanying drawings forming art of this specification,

igure 1, is a vertical section through a Chaser holder showing the serrated faces and, in dotted lines, the position of the holes for the spindle of the screw Carrying stop,

Figure 2, is a vertical section partially broken away showing the application of my invention to a Conventional form of Chaser holder,

Figure 3, is a perspective view of a Chaser formed With serrations in accordance with my invention,

Figures 4 and 5, are perspective views of forms of lead angle fill blocks or plates with serraticns formed in the locking faces thereof,

Figure 6, is an enlarged fra mentary perspective view of a Chaser ho der and Chaser, showing the relation of the screw Carrying sto and spindle to the Chaser and to the spind e receiving holes in the Chaser holder, and

Figure 7, is a perspective view of a lock bar formed in accordance `with my invention.

The Chaser holder 1 (Fig. 2) has a Chaser seating face 2 formed with longitudinal serrations 3, and a lock bar channel 4, 'with similar serrations 5, extending longitudinall thereon.

'l ese -serrations 3 and 5, can also be applied te lead angle ll plates 6 and 'l' of Chasers holder l (Fig. 1), as shown in Fig-4 ure l, which form the subject matter of a separate application filed of even date herewith.

rIhe Chaser 8 is made with a seating face 9, having longitudinally extending serrations 10, formed to interlock with the serrations 3 on the Chaser seating face, the Cutwardly projecting serrations of one face extending into the inwardly formed serrations of the other.

The chasers are provided with lock har contact faces having seri-ations 11 formed thereon. n This lock bar contact face takes the place fof the dovetail `angle or shoulder now in lse. Lockhbflr 12 has seratedlenl; a in e es13,w ic en a can interoc vih tghe srrations 11 am? 5g The lock bar is clamped in position by the usual screws 14 which engage openings 14 in the lock barv 12. 3

`It will be obvious that the use of serrations in lace of smooth faces insures much greater rictional contact and that the chasers will be held immovable by comparatively slightpressure on the lock: 1 bar.

At convenient intervals 1n the chaser holder and perpendicular to the main body of the chaser are formed the holes or openings 15, to receive the spindle 16 of the screw carrying sto or block 17, in which the screw 18 vis rotata ly mounted. One end of the screw bears V against the rear end of the chaser for longitudinal adjustment thereof.

In making adjustments on the chaser, as when inserting a long one in place of a short one, the stop or block is lifted up` and removed from the hole in which it is support.- ed and moved to any other hole that 1t may be convenient to use. Obviously this precludes the necessity for retractlng or advancing the screw to any great extent.

I claim:

1. In a cutter head, a chaser holder havy ing openings, a chaser and means for holding said chaser in position on said chaser holder, and means supported in one of said holes or openings' and capable of removal and insertion in other of said openings for longitudinal adjustment of said chaser.

2. In a cutteryhead, a chaser holder having openings, a chaser and means for holding t and means coo erating with the openings in said holder or longitudinal' adjustment` of said chaser.

3. In a cutter head, a cha'ser holder hav.- ing o enings, a chaserand means for holding. the chaser in position on said holder, vand a screw carrying block and a spindle /Iiolder and formed with two e chaser in position on said holder,v

adapted to cooperate with said o enings for longitudinal a justinent of said c aser.l

4. In a cutter head, a chaser holder llavmg openings, a chaser having chtting serrations on one face and clamping means for holding the chaser in position on said holder, the contacting surfaces of the/jchaser, chaser holder and clampin means being formcdwith serrations para lel to the first mentioned serrations so that a maximum frictional engagement is had and the chaser is held a ainst lateral movement, and `means cooperating with the openings in said holder for longitudinal adjustment of said chaser. y

5. A chaser holderhavin a chaser channel and a lock .bar channe, lead an le fill plates in said channels, a chaserA 1n the chaser channel having a lon itudinal shoulder on the back thereof, a yook bar inthe lock bar channel engaging said shoulder and one fill plate, the contacting surfaces of the fill plates, chaser, lock bar and shoulder having `longitudinally extendin lserrations, and means to secure the lock ar thereby clampin the chaser,

6. A ead an le fill plate for adjustin chasers in their'olders, comprising a bloc havin two opposite lfaces at a small angle to eac other,'one of said faces being formed with lon itudinally extending serrations.

7. A c aser holder comprising, a chaser formed with serrations on one face thereof,-

a lead angle `fill plate having two'or posite faces` inclined to each other one of w ch is serrated to rovide a seat for the serrated face of the c aser, substantially as set forth.

8. A chaser holder comprislng, a chaser,

lead angle fill lplate secured in said chaser olppo'site faces ar engaging inclined to each other' a lock the chaser and fill plate, the contactin portion of the lock ar and lill plate ing formed with mterengaging serrations, substantially as set forth.

' In testimony whereof I aix my signature.

vCLAREirIoE G. CASHMAN.

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