US1779306A - Valve-stem lock-replacing tool - Google Patents

Description

Oct. 21, 1930. J. CLARK VALVE STEM LOCK REPLACING TOOL Filed Nov. 26, 1929 2 Sheets-Sheet 2 IIII. ..llz

v rd [dla/kg* *4% Pate'nted Oct. 21, 1930 m .T. wir, or rom nonem, conomo VALVE-STEM LOCK-EPLACING TOOL Application filed november 28, 1929. Serial No. 409928.

This invention relates to tools for use in assembling parts of machinery and relates.

particularly to a tool designed to facilitate the replacement of the split looking cones '5 between the valve stems of internal combustion engines and the control spring for the steme.

In a large number of internal combustion engine motors at present manufactured the collars surrounding the lower ends of the valve stems and supporting the valve stem controlling springs,` are maintained in position on the stems bymeans of splt frustoconical cones which surround the stem and 16 engage in a recess formed circumferentially thereof. The collarssupporting the springs are formed to receive these cones and thus maintain the halves firmly in position on the stem. The placement or replacement of these 20 split cone looks is diflicult due to the fact that little space is permitted for the mechanic to work in and in addition to this a valve spring lifting tool must be held in place to keep the valve spring `compressed while the lock is placed in position. While tools have heretofore been devised for maintaining the twohalves of the looks in place while the valve stem spring is being released to lower the washer overthe cone lock, these tools are not particularly eflicient fo`r two reasons, the

rst being considerable difliculty is experienced in placing the cone halves in the tool preparatory to locating on the valve stem and in the second place the tools are clumsy in that they are so thick that they must be removed before the valve spring compressor can be released thus often allowing the cone lock to fall from position and they cannot be mani ulated to allow the operator to work from di erent angles in the small chamber in which the valve spring is located.

y The present invention has for its primary object to provide a conereplacer which overcomes all of the above enumerated undesir- &5 able features of the tools at present in use in being small, compact and of such a nature that the halves of the conecan be easily and quickly -mounted in the tool and easily placed in osition about the valve stem; the valve ;59 spring lifter can be released and the cone engagng collar or Washer permitted to come to rest over the cone before the replacer is removed; and the cone holding part of the replacer may be adjusted with relation to the handle thereof so that the mechanic can reach the valve stem from difierent angles.

The invention will be best understood froma consideration ofthe following detailed descript ion taken in connection with the accompanying drawings forming part of thi; specification, with the understanding, however, that the invention is not confined to any strict conformity with the showing of the drawings but may be changed or modified so long as such changes or modifications mark no material departure from the salient features of the invention as expressed in the appended clains.

In the drawings:

Figure -1 is a transverse sectional View through a valve stem chamber of a* motor vehicle showing the application of the device embodying the present invention, parts of the device being in section.

. Figure 2 is a horizontal sectional View looking down on the deyice in operative position as shown in Figure 1. e

Figure 3 is a longitudinal sectional View thro'u h the cone' arms of the device show- 'ing ot er parts in plan. A

Figure 4 is a vertical longitudinal section through the forward or working end of the device.

Figure 5 is a detailed view of the inner face of a jaw showing a portion of the ejector bar in section.

Figure 6 is a sectional view taken on the line 6--6 of Figure 4. a

Referring more particularly to the drawings wherein like numerals of reference indicate corresponding parts throughout the several views, there is shown in Figure 1 and indicated by the numeral 1, a portion of the housing about the lower end of the'valve stem of an internal combustion engine, the valve stem being indicated by the numeral`2. In the structures in association with which the present tool is designed for use the lower end of the valve stem is provided with a circumferential recess 3 which is relatively deep at the lower part and tapers ofi' toward the top of the stern in the manner shown, this recess being formed to receive a split cone lock 4 about which engages the cup portion 5 of a Washer 6. This Washer 6 supports the lower end of the usual valve stern controlling spring 7 the upper end of which engages the overlying portion of the body 1 in the usual manner. v e

The tool embodying the present invention is designed, as previously explained, to facilitate the insertion or placement of the two halves of the cone lock -4 while the Washer 6 is held up and the spring 7 is held in compressed' condition by the usual spring compressor indicated generally by the numeral 8. This tool comprises a handle portion 9 which as shown is in the form of a fiat steel bar.

At one end there is pivotally mounted upon the handle or bar 9 a pair of relatively short arms 10 each of which is as shown substantially U-shaped in cross-sectional design, the open sides of the arms being arranged in opposed relation and the adjacent edges are provided intermediate their ends with the ear extensions 11 which overlap and have passed therethrough a pivot pin 12 which as shown also passes through the bar 9. A spring 13 is interposed between the rear ends of the handles 10, being held in place by the pin 12. This spring normally maintains the jaws 14 formed at the other ends of the arms 10 in Contacting relation.

Each of the jaws 14 formed at the forward end of an arm 10 comprises a low upstanding wall 15 of arcuate contour and disposed at a slight inward inclination, and an inwardly extending relatively' narrow fiange 16 formed along its lower edge. As is shown these jaws 14 have their concave faces in opposed relation so that a split cone `disposed therebetween Will be rnly held thereby against any movement.

Extending longitudinally between the arms 10 and partly within each of the same is a shiftable bar 17 this bar being provided intermediate its ends with the longitudinally extending slot 18 through which the pivot pin 12 passes. At its rear end the bar 17 is turned up slightly as indicated at 19 and at its forward end it is of slightly greater width for a portion of its length as indicated at 20, the forward end being 'cut in or recessed slightly as indicated at 21.

In the use of the present tool for the insertion of a cone lock the shiftable bar 17 is first shoved forwardly until the portion 20 lies between and extends beyond the j aws 14. This portion as shown lies in a plane above the cone supporting flanges 16. The rear ends of the arms are then forced together against the tension of the spring 13 so as to move the jaws away from the bar 17 and one of the cone halves is then placed.

in upright position upon the flange 16 of one jaw and between the 'jaw and the adjacent edge of the bar 17. Upon releasing the arm controlling this jaw this cone will then be firmly held in place. The thumb of the user is then pressed against the other arm t'o Swing the other jaw outwardly from the portion 20 of the bar 17 to permit the insertion of the other cone half, the two halves of the cone When ready for application to the valve stern being held in spaced relation and against the edges of the portion 20 of the bar 17 by the jaws 14.

With the valve stern spring and Washer maintained in raised position in the manner shown the recessed end 21 of the bar 17 is then placed against the deep portion of the recess 3 and pressure applied to and longitudinally of the handle 9. This will cause the bar 17 to move rearwardly on the handle and will locate the cone halves inposition about the valve stem, the jaws 14 remaining in place and holding 'the cone in this position. Due to the thinness of the walls 15 of the jaws 14 and the fact that these jaws conform in shape to the cone lock 4 the spring lifter may then be released to permit the washer 6 to move downwardly to position over the nut, the coupled portion 5 of the Washer receiving and holding the two halves of the cone before the replacer is removed.

After remval of the spring lifter the replacer may be pulled out leaving the cone in applied position.

From the foregoing description it will be readily seen that the valve stern cone lock replacing tool embodying the present invention will enable a mechanic t'o replace the cones quickly and easily without danger of losing either of the halves before they are in place.

Having thus described my invention, what I claim is 1. A valve stern split cone lock replacer comprising a handle member, a pair of arms each of substantially U-shaped cross-sec.- tional design pivotally mounted intermediate their 'ends at the forward end of the handle with the open sides thereof in opposed relation, a pair of jaws each carried at the forward end of an arm and comprising an inwardly canted arcuate wall and an inwardly extending flange at the lower edge of each wall, said jaws being adapted to' snugly receive a split cone therebetween, and a flatbar sldably disposed between said arms witha portion of each longitudinal edge housed in an arm.

2. A valve stem split cone lock replacer comprisng a handle member, a pair of arms each of substantially U-shaped cross-sectional design pivotally mounted intermediate their ends at the forward end of the handle' with the open sides thereof in opposed relation, a pair of jaws each carried at the forward edof an arm and comprsing an-inwardly canted arcuate wall and an inwardly-extendingflange at the lower edge Slidably of each wall, said jaws being adapted to snuglyreceive "a split cone therebetween, and a flat separating bar for the eone'halves disposed between said arms` with a i ,portion of each longtudnal edge housed in an arm, said arms being spring controlled to maintain the jaws in closed relation, and

' said bar being longitudinally slotted to slidably'move relative to' the pvotal center of the arms. r

In testimony whereof I'hereunto 'affix my signature.

' v IRA J. CLARK.

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