US1189563A

US1189563A - Set-works gripping device.

Info

Publication number: US1189563A
Application number: US73356412A
Authority: US
Inventors: Lemuel D Hanford
Original assignee: Allis Chalmers Corp
Current assignee: Allis Chalmers Corp
Priority date: 1912-11-25
Filing date: 1912-11-25
Publication date: 1916-07-04
Anticipated expiration: 1933-07-04

Description

L. D. HANFORD.

SET WORKS GRIPPING DEVICE.

APPUcATloN HLED Nov. 25. i912.

l 1 89,563 Patented July 4, 1916.

AT1-GRN EY tinirnn srnrns ramena crimen.

LEMUEL D. IIANFORD, OF MILWAUKEE, WISCONSIN, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO ALLIS-CIIALMERS MANUFACTURING COMPANY, A CORPORATION OF DELAWARE.

SET-WORKS GRIPPING DEVICE.

Speccaton of Letters Patent.

' Patentes .nay a, isis.

Application led November 25, 1912. Serial No. 733,564. i

To all 'whom it may concern Be it known that I, LnMUiiL D. HANFORD, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of lVisconsin, have invented a certain new and useful Improvement in Set-Works Gripping Devices, of which the following is a specification.

This invention relates to improvements in the construction of set-works for sawmills, and particularly to gripping devices adapted for use in that class of set-works in which the settingl is performed by hand power.

An object of the invention is to provide a gripping device for hand-power setworks which is simple in construction and eihcient in operation.

` Another object is to provide a mechanismV which is more durable and accurate in its operation than similar devices of the prior art have been.

These results are accomplished generally in the device of the present invention by improving and strengthening the various elements so that the possibility of excessive wear with its resulting lost motion, is practically eliminated.

Still another object of the invention is to provide a device in which the parts which are subject to greatest wear are accessible and readily removable.

A clear conception of an embodiment of the invention may be had by referring to the drawing accompanying and vforming part of this specification in whichflike reference characters designate the same or similar parts in the various views.

Figure l is a side elevation of a handpower set-works, showing fragments of the operating lever and carriage. Fig. 2 is a transverse vertical section through the set shaft, carrier arm, grip-block and gripblock cap. Fig. 3 is a vertical section through the carrier arms, grip-blocks, springs and grip-block caps, the section being taken on the line II--II of Fig. 2 looking in the direction of the arrow.

The set-works as disclosed, shows the various operating elements in mid-position. The frame 23 is mounted on the carriage 31 in the usual manner and has bearings 80, 32, formed therein. The rock shaft 22 is supported in the bearings 32 and has the usual crank disks 21V and operating lever 18 se cured thereto. rihe set shaft l is supported to rotate in the bearings 30 of the frame 23, and has a ratchet wheel 5 mounted thereon and securedthereto by any suitable means, such as keys 34. A pair of

carrier arms

2, 4, are 'supported by the set-shaft l, one on each side of the ratchet wheel 5. The carrier arms 2l, 4:, are free to oscillate on the shaft l, being removable from the shaft l upon removal of the

retaining caps

16, 17, which are`secured to the

arms

2, 4, respectively, by means of bolts 6. The free eX- tremities of the carrier arms 2, t, are provided with gripblock supports 36, 37, which are preferably formed integral with ythe body portions of the

arms

2, 4. yThe gripblock supports 36, 37, extend over the face of the ratchet wheel 5 and have parallelsided, radially directed openings formed therethrough.

The grip-blocks 11, which in the present disclosure number two to each

carrier arm

2, 4, have parallel sides which closely fit the sides of the radially directed openings.

formed through the supports 36, 87. The teeth of the grip-blocks l1 are similar in contour to those of the ratchet wheel 5. The openings in the supports 36, 37, are so located that with the teeth of one of the blocks 11 in full coaction with the teeth of the ratchet wheel 5, the teeth of the other block will be in contact with the adjacent teeth of the ratchet wheel 5 along the inclined surfaces but not along the radial surfaces thereof, see Fig. 2. The object of this construction is to -prevent excessive return motion or slip of the ratchet wheel 5 during withdrawal of one of the grip-blocks 11 from operating position and application'of another block 1l to operative position.

The grip-blocks l1 are provided with stems 8 which extend away from the blocks in a direction radial to the set-shaft l, and pass through the removable grip-block caps 12. The helical compression springs 13 surround the stems 8 and coact with their outer ends against the caps l2 and with their inner ends against the grip-blocks 11. These springs 13 tend at all times to force the grip-blocks 11 radially toward the set shaft l and wheel 5. Removable transverse lifting pins 14; pass through the outer ends of the stems 8, some distance above the caps l2. rIhe forked grip releasing arms 7 are pivotally mounted on removable pivot pins 33, and have forked ends the prongs of which eXtend under the projecting ends of the liftingpins` 14. The corresponding inwardly projecting ends ofthe arms 7 extend to a position in proximity with theireleasing cams 10. The cams 10, of which there is one for eachi set of grip-blocks 11, are.

secured to stub shafts 15 which are rotatably mounted in bearings the

carrier arms

2, 4. The releasing` levers 9 have their inner ends secured to the shafts 15A, while their outervcorresponding" ends are directed toward each other to substantially span the gap between the .carrier armslfZ; 4.

The' carrier arm 41 is connected with the crank disk 2f by means of a connecting' rod 19.` the end of which is removably connected with' the arm' 4 by a bolt' 24'. The carrier arm '2f isconnected' with'. the crank disk 21' by means' of a connectingro'd 20' the end of which is removably.' connected with the arm Q'by` a bolt 3.

During settingl operation of the mechanism, the operating; lever 18 is o'scillated about thea rock shaft 22 causing the

crank disks

2,1 to oscillate with a resulting'reciprooation of the' connectingV rods,1f9; 520;y As

' the pin 24"` ismoved.v forward by the connect'- ing rod 19; the carrier' arm 4( and its corresponding grip-blocks 11 are oscillating about' the set' shaft' 1 in an anti-clockwise direct'ion, and areV eife'ctive in rotating the ratchet wheel 5. Duringthe forward move-` ment ofthe connecting rodK 19, the rod 20'is beingwithdrawn withl a resulting` movement of the carrier arm 2" and itsl grip-blocks 1`1` in aY clockwise or ineffective direction. Upon reversal of: the movement' of the operating lever18, the reverse movement ofthe

carrier arms

2, 4,.,takes place, and the grip-blocks 11 ofl the carrier arm 2' becomeeif'ective in moving the. set shaft lwhile those of' the carrier arm 4 become meifective and recede in a clockwise direction around the periphery ofl the wheel 5. It will thus be seen that the intermittent oscillatory movement of the operating. lever 1'8'is transformed int'o continuous rotary movement of the set shaft 1.

During recession of the knees on" the set works andL while a fresh log is being plac'ed', it isdesirab'le to .havev theA set shaft 1, free to rotate without restraint in` a clockwise direction. Inr order' to so release the set shaft 1*, the ratchetwheel must be released; by withdr'awal of' the grip-blocks 11 therefrom. This removal" of the grip-blocks is preferably effected by bringingthe 'operating lever 18 to mid-position and"y their simultaneously *swinging the two releasing levers 9' so that the releasingY cams' 1'0 take a substantially longitudinal rather than a vertical position asl shown. This change in position ofthe cams'l'O causes pressure against the inwardly projectingl ends -of' the' releasing arms 7. This pressure` separates the ends of the arms 7 and. forces the forked ends of the arms 7 outwardly andt away fromvr the ratchet wheel 5. The outwardly moving forkedv ends of the arms 7 eventually comein contact, with the: ends ofthe transverse pins 14 andy lift the stems 8 and grip-blocks 11 away from the ratchetv wheel 5 against the pressure of the springs 13. The release of all of the grip-blbcks 11 needtnot be effected simulv taneously ifnot so desired. When thev knees have been brought totheir proper positions, the levers 9" are returned to.. setting position, immediately followingwhich the gripblocks' 11 become effective and:` positively.

lock the set shaft against further' motion in' a clockwisel direction. If' it i's desired to remove the grip-blocks 11 for inspection, it is necessary only to; re-

move the caps landp'ins 33', whereuponthe blocks 1'1 may be readily withdrawn from their sockets. l VThe formation of each indi"- vid'ual grip-bleek l1 with a number of' grippingtee'th,w provides a larger gripping area and reduces the danger Ofbreaking of the gripping means. The use ofgrip-blbcks 11 having plane surfaces of reaction in the carrier arms 2", 4, also' eliminates the eXcessive wear heretofore encountered' with the use ofYA pivotal supports for the pawls; thereby providing a more accurate setting device. By forming the supports 36, 37., integral with the carrier'.

arms

2, 4, a more rigid support ofthe grip-blocks 11 is obtained, than by suspending the pawls from overhung pins. It will alsolbe observed that-all' ofthe working partsofthe device arereadily ac'- cessible for lubrication andi repairs in eases of emergency.y p

It should be understood that it is' not desired to be limited to the exact details of construction shown and described, for' obvious, modiiications will occur toa person skilled' in the' art.

Itis claimedand' desiredto secure by Letters P'at'ent,- Y v 1. In combination, a set-shaft, a ratchet wheel secured thereto, a carrier arm having an opening therethrough, a cap secured; to

said` carrier ,arm` adjacent the opening therein, .a grip-block movable within. said opening and havingja projection formedI with an abutment; and an armen'gageable with said abutment'` for' moving said gripJ-b'lock away from said ratchet wheel and' for retaining tion of said block, whereby said gripblock is retained within' the recess of said carrier arm at all times.

In` testimony whereof, thesignature of the inventor is axed hereto in the presence of 15 two witnesses.

LEMUEL D. HANFORD.

through said opening upon removal of said cap.

3. ln combination, .a carrier arm having a recess therein, a grip-block slidable within said recess and formed with abutments, a cap, and an arm, said cap being engageable with an abutment of said grip-block to limit outward motion of said block and said arm Witnesses: being!` engageable with another of said abut- G. F. DE WEIN, ments of said grip-block to limit inward mo- W. H. LIEBER.

@oplos of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C.