US1792506A

US1792506A - Jig

Info

Publication number: US1792506A
Application number: US101293A
Authority: US
Inventors: Frank U Paulins
Original assignee: Individual
Current assignee: Individual
Priority date: 1926-04-12
Filing date: 1926-04-12
Publication date: 1931-02-17
Anticipated expiration: 1948-02-17

Description

Feb. 17, 1931.

F. u. PAULlNs JIG Filed April 12, 1926 42 Sheets-Sheet l gnuevd'oz: @duff/guas F. U. PAULINS Feb. 17, 1931.

Filed April l2, 1926 2 Sheets-Sheet 2 Patented Feb. 17, 1931 `iTED dem@ YFamilia; PAULINS, 0F PONT-IAC, MICHIGAN JIG - Application( inea April 12,

LThis invention? relatesto ua jig and' hasv Vspecial lreference `to work clamping means V-for holding apiece ofwork tobeoperated *l uponby drills and other tools.

' f "My invention aims to provide aV jig embodying a reciprocable clamping member and novel means for adjusting said clamping member, said means being constructively arranged Yso that the clamping member may "'10 be firmly held in engagement with a piece of work or yieldably held in engagement therewith, and in either instance quicklyreleased.

My invention further aims to provide a jig wherein a work clamping member is reciprocable on a post with means extending through said post for reciprocating said clamping member. Additional means is located under said clamping member and at the V*lower end` of said post for operating the'rstmentioned means.

My invention'still 'further aimsy to provide adurable, (inexpensive jig that may be easily andquickly adjusted, and the'jig includes interchangeable adapters and other i5 devices bywhich thejig can be conveniently ""7 away and partly in section;

Fig. 3 is a front elevation of the jig partly broken away and partly in section;

Fig. 4 is a side velevation ofthe jig, partly brokenaway and partly in 4s'ection,'and

Fig. 5 'is a' horizontal sectional view taken on the line V-V of Fig. 3.

Thejig comprisesja hollow substantially rectangular base 1 and communicating there# withis a tubular post 2. This post is located 5 olf center, so as to provide clearancefor a tubular adapter, anvil or work engaging socket detachably mounted in the base.

f Slidable 'on' the tubular post 2 is the sleeve 4 of a work clamping member 5 which is provided-with an interchangeable adapter, tu-

like.

1926. Serial No. 101,293.

bular guide or work engaging device 6 adapted to cooperate with the adapter 3 4in engaging and supporting a piece of work in position to be operated upon. As shown, the piece of work is the bearing end of al connecting rod adapted to be drilled or reamed by a drill or bit passing through or into the ada ters 3 and YG'. In some instances these intere angeahle adapters may be' 'dispensed with and the clamping member 5'3"* used with the base 1 for holding a-'piece of work in position.

The tubular post 2 is provided witha longitudinalgroove Sand the sleeve a groove'Q confronting the gro-ove S'so 'th'atva key 10 may be placed in 'said groove to' prevent rotation of the sleeve 4 relative to'the l post 2. The-sleeve 4,l adjacent'the' groove 9, Vhas an enlargement 11 'for key engagingscrewsV 12 that may be equipped "withl lockt" nuts 13. The screws 12 may be adjusted to properly position the "key 10 relativeto the post 2, and vsaid key may be retained within the groovesS and 9 by dowel pins14 or the end thereof notched or castellatedfas at and adapted to be held against rotation byv a cli 19 on the cap. Y

bcrewed into the nut or bushing 17 is a stem 20 of a stirrup 21 and pivotally mounted in saidstirrup byV al pin V2 2 is the upper endl of a connecting rod23 which entends downwardly in the, post 2 into the base 1.

Journaled in the sidewalls of the base 1 is a transversely disposed rock shaft 24and keyed or otherwise mounted on said-rock curved end of said rod that permits the lowerA pivotal connection with the rock shaft 2411s suming a position on the opposite side of'said rock shaft from the pivotalconne'ction at the 1apper end of the connecting rod. Thi'sfposition of the pivotal'connections is on the near side of a line A passing through the center of the -rock shaft 24, as indicated in Fig. 1, and consequently the connections cannot assume a locked position for the clamping member 5 in engagement with the piece of work 7. lt will be noted that the cranks 25 and the inner wall of the post 2 are cut away to provide clearance for reciprocation of the connecting rod 23.

On one end of the rock shaft 2li is fixed a lever 27 by which the rock shaft may be con veniently rocked and the upwardly swinging movement of the lever 2 is limited by a stop pin 28 carried by the side of the piece 1.

At the opposite end of the rock shaft 24 is a notched collar 29 located in a side extension 30 of the base 1. A spring aressed non-rotatable detent or latch 31 is located within the side extension 30 and together with said notched collar retained in said side ex :ension by a closure plate 32. The detent or latch 31 and the collar 29 cooperate in preventing accidental movement of the rockable shaft 24 and the lever 2T after the clamping member 5 is raised.

The rock shaft 24 has other cranks to which are pivotally connected tension devices located within the base 1 and adapted for yieldably holding the rock shaft 24 against counter-clockwise rotation, viewing Fig. 1. Each tension device comprises telescopic members 33 having the outer ends thereof provided with spring abut-ments 34C and 35 for the end convolutions of a. coiled expansion spring 36 encircling the telescopic members The spring abutments 35 are connected to cranks of the rock shaft 24, and the spring abutments 34 are connected to transversely disposed rods 37 mounted in the hollow members 1. The tension devices are disposed in parallelism at opposite sides of the vertical axis of the tubular post 2 and said tension devices have an expansive force constantly exerting pressure against the rock shaft 24 to prevent counter-clockwise rotation of said rock shaft, except when said tension devices are manually placed under compression. rlhis may be accomplished by swinging the lever 27 to substantially a vertical position whereby the work clamping member 5 is raised, or a piece of work may be forcibly placed in position and thus cause the clamping member 5 to yield until the piece of work is in position. Obviously the tension devices will more or less compensate for manufacturing diderences of size in pieces of work to be held by the Great differences are taken care of by interexchanging the adapters 3 and 6 and other changes may be taken care of byadjusting the sleeve 4L- of the clamping member relative to the upper end of the connecting rod 23.

The base 1 may be provided with lat-eral slotted lugs 38 to facilitate mounting it on a bench or other support and with the firmly anchored it may be safely and expediitously manipulated. I attach considerable importance to the tension devices being housed and protected within the hollow base 1, and with the sleeve l of the clamping member 5 guided on the rigid post 2 there is a substantial support for the clamping member which prevents any displacement during manipulation of the lever 27. rThis lever permits of considerable leverage being obtained for clamping a piece of work and the lower curved or off-set end of the connecting rod 23 may afford an over-center locking position for the lower end of the connecting rod 23 so as to afford a positive and reliable clamping condition for the piece of work. However, in the position shown in Fig. 1 the clamping member is yieldably held by the tension devices, so that said clamping member may shift to care for any irregularities in sizes, and may be instantly released by an upwardmovement of the lever 27 which places the tension devices under compression with stored energy for turning the shaft 24 and lowering the clamping member 3 when the lever 2? is moved sufficiently to avoid holding by the detent or latch 31. It is by 7irtue of this detent or latch that the clamping member 5 may be retained in a raised position against accidental movement, and it is only necessary to strike or slightly move the lever 27 to release the detent 31 and permit the tension device tolower the clamping member.

It is to be noted that by removing the cap 15 that another type of clamping member having a sleeve may be substituted for the clamping member 5, and while in the drawings there is illustrated a preferred embodiment of my invention, it is to be understood that the structural elements are susceptible to such variations and modifications as fall within the scope of the appended claims.

What I claim is 1. A jig comprising a hollow base, a post, a work clamping member slidable on said post and adapted to cooperate with said base in holding a piece of work on said base remote from said post, a connecting rod in said post extending into said hollow base adapted for sliding said work clamping member on said post, said connecting rod being adjustably connected to said clamping member within said post having a curved lower end, and a crank shaft in said hollow base offset from the axis of said post, said curved connecting rod being pivoted to a crank on said shaft, adapted for shifting said connecting rod, movement of said crank causing the pivot of said curved connecting rod to pass under and beyond the axis of the crank shaft, and tending to lock said work clamping member, and a handle for operating said crank shaft.

2. A jig as called for in claim 1, and a spring tension device disposed in said hollow base connected to said shaft and adapted to hold said curved connecting rod With its pivot beyond the axis of the crank shaft vvhereby to positively lock said Work clamping member normally in a Work clamping position.

3. Work clamping means comprising a base, a Work guide thereon, a single post on said base to one side of said Work guide, a Work clamping member above said Work guide and having a sleeve slidable on said post, a connecting rod extending upwardly in said post and connected to the upper end of the sleeve of said Work clamping member, a rock shaft in said base operatively connected to said connecting rod, a handle for rocking said shaft, and a tension device laterally disposed in said base adapted to resist rocking of said shaft and adapted for holding said connecting rod in looked position With the Work clamping member in a Work engaging position.

4. Work clamping means comprising a hollow base, a reciprocable Work clamping member adapted to cooperate With said base in holding a piece of Work, rockable means inclosed by said base adapted for reciprocating said clamping member, a handle adapted for rocking said rockable means to a locked position relative to said clamping member, and yieldable means in a plane below said rockable means and bearing against said rockable means adapted for retaining said rockable means in a locked position.

5. Work clamping means comprising a base, a reciprocatable Work clamping member adapted to cooperate With said base in holding a piece of work, a connecting rod having a pivotal connection With said Work clamping member, a crank rock shaft in said base at one side of the axis of the pivotal connection of said connecting rod and under Which shaft extends a lovver curved end of said connecting rod With a pivotal connection with the crank of said rock shaft so that the pivotal connection at the curved end of said connecting rod may assume positions on opposite sides of said rock shaft to afford a secured position for said Work clamping member, and a handle for rocking said crank shaft.

6. Work clamping means as called for in claim 5, and yieldable means in said base bearing against said rock shaft to maintain a secured position for said Work clamping member.

7. Work clamping means comprising a hollow base, a Work clamping member above said base, a connecting rod extending out of said base and operatively connected to said clamping member for shifting said clamping member relative to a piece of `Work, said connecting rod having a curved end in said base, a rock crank shaft in said base and having its crank portion connected to the curved end of said connecting rod, a handle for rocking said crank shaft and a tension device in said base operatable against said rock shaft and in a plane substantially at a right angle thereto to effect a clamped condition of said Work clamping member.

8. Work clamping means comprising a base, a vertically reciprocable clamping member above said base, a connecting rod extending into said base adapted for reciprocating said clamping member, a crank shaft disposed in said base and oifset from the axis of said post, a crank on said shaft and connected to said connecting rod, a spring device mounted 'in said base and acting on said crank, and adapted to rock said shaft and operate said Work clamping member, and means for compressing said spring device to relieve the tension on said crank. Y

9. A jig comprising a hollow base, a post, a Work clamping member on said post and adapted to cooperate With said base in holding a piece of Work, rockable means enclosed in said base, a handle for operating said rockable means, means for exerting spring pressure against said rockable means tending to rotate the same and lovver said Work clamping member, and a stop member for retaining said Work clamping member out of engagement With the Work against said spring pres- In testimony whereof I affix my signature.

FRANK U. PAULINS.