US2539878A

US2539878A - Clapper block

Info

Publication number: US2539878A
Application number: US745518A
Authority: US
Inventors: John M Walter
Original assignee: GA Gray Co
Current assignee: GA Gray Co
Priority date: 1947-05-02
Filing date: 1947-05-02
Publication date: 1951-01-30
Anticipated expiration: 1968-01-30

Description

Jan. 30, 1951 J, M WALTER 2,539,878

CLAPPER BLOCK Filed May 2, 1947 J m A I N VEN TOR. l'j'H/v M M1. TE?,

ATTORN EVS.

Patented Jan. 30, 1951 icuii Mtvairi,'jciiicillnatgmiic;assigner f5 The" c; A; Gray "cempaiiy, cincinnatioiioy corr* applicati@ Maya, 1947,? serai No.V 745,518:

s emma (alight- 5@ Myvinventionqrelates to devices usedfin metal planersA onVw-hich'p-the tools are supported that cut intothe work as the latter traverses past them. In the usual construction 'in planers a toolbox is provided which is supported. soV as to be tiltably adjustable-gthisjbox serving to Vmount the apron or theclapper blocky in a pivotal man'- ner between' twoside' vbars whichfrom 'a pocket in which the block lie'swheiin operating" posi"- tion.' Ihe"'tot')1v loxlisfriu'v Vve'dfonV aslide supported on tlha'rpf ofthe'`ric'zlii'iie,4 which slide may be moved'up` a' dfdovvn' on the saddle either by power' or by'hand.

In the `o`peratioM into the? Workind i it is iovin'g in Qi dirc'tioi'fand'` the Work nlno'ves inthe pposta'dilectn." I t 1S f'this reason that the bldck or" apron which Vholds 'the tools is pvitallyinntd" aits tipp "endl s`"that the todls canta'il ov'tlre "surf vCaf`th'e work on`ts'ret`urn'.'mvntf It isdeSiralil'e,` HOW'- ever] andmdrn 'plaiies "are"'so"fequipped`,"' to provide means for lifting theapn'slightly by' an automaticallyn operating, device"sucli" that' when the work. stroke 0'1?i thepla'ner table` is' completed the apronto'r clapper. block' will be pushedoiits seat ready to' trairth'etools over the work.`

Carrying this.` idea furthertit has"'"been suglgested4 that means" be provided1 for" irn'pturtingV a er, the" weis' cui are; liftedv clear/of"V the work; and'willf` not'drag over it: It is'tofthewend "of providing-a practical device to accomplish this purpose that "theu 1;')resentl inventionv is directed?V AsE illustrated, the invention yis showi'asfapplied'to aLA particular-1 springrv count'erbalancedl apron'l of mypendi'ng applica-Morivv for' Pate'ntSer.I Nef-713,325, y,zt-lied November 1946? and 'nowY Patent N o;"`2,513 0,343`, granted Novemberz '14, 1950;' and `as "'uftil'izingwastandardvv type of 11rnechanis'in of lifting pin -1 for the apron, which the objective of myiinvention is toaugmentrather than seeking to provide an entirely different mechanism. In many of its aspects my invention' canbe'applied to variousif lifting devices; ande theA spring counterbalanced type of apron, while desirable as a combination element in my invention is not essential. Itl willl be realized from the above statement that a lifting device for the apron must be -one= whichcan operatf'irrespe'ctiveof the#positionofthe tool lb'oirfcjri its slide' or'of itss1ide"on'=the planersaddle.` Such a device iswinherently rconfined -in -its Iamplitude of movement because. ofy the necessities-ofconstruction, whereby it is fitted in with the necessary elements of the saddle, slide, 'and tool box. It may 2 be :stated that irrespectiv'e of'Y theL particular mechainsm' 'used to operate'fieth usii 1i-fief! for planer. apronsvconsists of Aa slide vpin nmuu ed, in theftocl box.` and operatedf from In'eclanisrn controlled from' the i planer rail; with; 'aff slibr'i rang 0fi movement.

The drawn-lgs are illustrative 'of' an example of niyinvention aiddshould not be "ta-lien asv disH closintle 'onli7 available mechanical instrumentauties to whicii myiiivhtion" may' te applied( In the drawings L' Figure 1 is a side elevation'zof partA of "tl'ie"slide,v

the tool bei( and apron'according"to Inyinvention.V n

Figure -2` is a front "eieyaen "thereof Figuref 3 is front'elevatin" f' th" 'toer' box; with the apron removed frni'it's" mour'tirgl Figure 4 is aV verticaly section taken th'roii'gh the ral1"sad`dle', slide,` bei and'aponhsh'vving the novel parte therein incrpor'at'ed according to my invention.

Figure v5 is a-Yview' i1lu's'trating'-theangle' of' lift attain'edb'y my device, being a section on the scale ofFig'ure butomitting the operating'pa'rts; fOr'the4 lift.

Figure 6 is a" perspective of"l the augmenting? plate". Y

Figure? is a detailof'the operating'en'd ofl thejrcck plate operating device in perspective,

Figure 8 is afdetail perspective showing ther mounting? for theJv ro'cli' plate.

Re'ferring'first'tc the'i'g'eiieral parts illustrated' the' cross rail of a planer "isindicated" at l, theel saddle at 2, the'slid on" which the" tool box is; supported at 3, and' tll'eftool box atl. The apron 5 is hinged'on' a pin "6 supported at the:` upper end vof 'thetwoside' bars 'l of the tool box; In this case a fixed thimble-securedover one" end of lthe pnrE, mounts a torsional spring Si' Whichihasa freeendbearingon afprojectin of thernountingfbarH11-offtheapron;r This is the' structure of my ou-pending' application above; identied'to whichf reffrf nce is herebyfmade for fur-ther 'fdeta-ils@ and principles of 'the structura The sprinlfg Sitendsf toliftthefaprong thus' serv-'lv' ing? as a counterbalance for'its 'gravity movement to position against the face ofthe tool? box'b'etween the twosidebars'I thereof. I have indicated a'c'utting tool- Il; secured by the Y'n'u'i'fs Secured on 'the inner face of the slide in a hollow space adapted for the purpose are a pair of lugs I'I, II, and a rock plate I8 is provided extending between the two lugs and having slotted ends I9 (Fig. 8), which engage over the lugs and are held in place by suitable pivot pins passing through the slotted ends and the lugs.

This plate when rocked will engage a pin 20, which is the lift pin of the device, which isspring pressed toward the rock plate, and slidably held in the bushing I4. The spring pressure is adjusted by a threaded nipple 2I in the outer end of the bushing I4. When the plate is rocked the pin will be pressed outwardly through the bushing and thus supply the power for lifting the apron from its operating seat. As shown, the apron has an overhanging lip 22 which engages under the shoulder at the lower edge of the tool box, to give rm support for the apron. The apron must naturally also move away from this shoulder when lifted.

Going back from the rock plate, the mode of operating it which is shown for illustrative purposes, is a rod 23 having a widened and slotted outer end 24 which rides over the elevating screw 24a for the slide. This outer end is provided with a pin 2'5 (Fig. 7), which bears against the rock plate so that when the rod is reciprocated the plate is rocked, contact being maintained by the spring on the push pin.

The rod 23 is introduced into the space occupied by the feed screw by passing through the drive sleeve 26 for the screw. This sleeve has a beveled gear 2'I out on its inner end which meshes with a bevel gear on a collar 28 which rotates the feed screw when it is driven by power.

As so far described there is no substantial difference in the mechanism than that already in use prior to my present invention or which is shown in my co-pending application.

A cavity is formed in the back face of the apron as shown at 29, this cavity being of a shape to clear the motion increasing tongue 30 which is hinged at 3I to the shoulder at the lower end of the tool box. When the apron is in normal operating position the tongue lies within this cavity as well as the hinged mounting for the tongue.

The tongue lies in front of the push pin, at a location selected with reference to the pivot point and length of the tongue so that the result of pushing in on the push pin will be to rock the tongue on its hinge a selected distance. The upper end of the tongue will bear on the wall of the clearance cavity in the back of the apron resulting in a lifting motion which is considere ably greater on the apron, than would be the movement of the pin itself.

This motion increaser results in giving the added elevation of the apron which is desired lifting the tools on the apron well away from the surface of the work during its return strokes.

I have indicated a rocker 32 which moves the rod 23, this rocker located in the rail of the planer, and put into motion upon reversal of the table movement.

It will be evident that the motion increaser located as it is permits of the use of any regular push pin mechanism on a planer and that the amount of motion of the apron is governed by the length of the tongue, and the proximity of the push pin to the pivot of the tongue This type of motion increaser has the advantage, aside from simplicity, of providing that the initial motion of the apron is approximately a direct movement in line with the thrust nin movement. which takes 4 the task of overcoming the inertia and friction opposing the initial movement. The added swinging movement can then be accomplished without exceptional power.

As already noted, the invention may be applied -to any other type of push pin operation and is not limited to the particular one described in order to give an example of the invention.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In combination a tool box, an apron pivotally secured at its upper end thereto, a push pin passing through the tool box where the apron lies thereon, and a motion increaser secured to the tool box between said tool box and apron, engaged by the push pin, and engaging the apron, said motion increaser comprising a lever fulcrumed on the tool box.

2. The combination of claim 1 in which the apron is provided with a clearance cavity for the lever.

3. In combination with a slide member mounted on the saddle of a planer having an elevating screw, and a rock plate located on said slide, and power means straddling the elevating screw and engaging the rock plate, a push pin located in the slide and spring held in contact with the rock plate, a tool box mounted on the slide, having on its outer face a lever fulcrumed thereon in a position to be engaged by the push pin, and an apron pivotally held on the tool box and arranged to engage said lever, for the purpose described.

4. The combination of claim 1 in which the apron is spring counterweighted toward movement away from contact with the tool box.

Cil

5. In combination a tool box, an apron hinged thereto, a push pin passing therethrough, an oppositely hinged lever mounted on the tool box so as to be engaged by said pin and lying between the tool box and said apron, the distance from the hinge point to the end of the lever being substantially greater than the distance from the hinge point to the location of the tool pin, whereby a motion increaser is supplied to move the apron on its hinged connection a distance further than the motion of the push pin.

6. The combination of claim 5 in which the apron is counterweighted on its hinged mounting.

7. The combination of claim 5 in which the apron is formed with a cavity for clearance of the lever.

8. The combination of claim 5 in which the apron when closed against the tool box has a projection which underlies a shoulder on the tool box in which the apron is counterweighted on its hinged mounting, and in which the lever is mounted on the face of the tool box, said apron being formed with a cavity to clear the lever and its mounting.

JOHN M. WALTER.

REFERENCES ClliED The following references are of record in the lle of this patent:

UNITED STATES PATENTS Number Name Date 1,372,286 Greenleaf Mar. 22, 1921 1,775,963 McCarroll Sept. 16, 1930 1,806,696 Mesker May 26, 1931 2,251,834 Praeg Aug. 5, 1941 2,387,012 Daugherty Oct. 16, 1945