US1385055A - Dust-cap for pneumatic tires - Google Patents

Description

w. 0. vxvARTTAs. nus cAP'FoR PNEUMATIC mEs.

APPLICATION FILED MAR. 25| 1920.

Patented July 19, 1921.

MIR,

JN VENTOR W/u/A/v 0 V/vAnrr/as narran WILLIAM O. VVARTTAS, OF WEEI-IAWKEN, NEW JERSEY.

i t Y :DUST-CAP FOR PNEUMATIC HERES.

To all w/wmvt may concern: Y

Be ity known' that l, WILLIAM O. Vivi-inrrns, a citizen of the Unitedr States, and a resident of Weehawken, in the vcounty of Hudson and Stateof New Jersey, have ini vented certain new and useful improveof the character Pneumatic Tires,

ments in Dust-Caps yfor a full, clear, and

of which the following' is exact. description.

Among the principal objects which the present invention has in view are: to diminish the time usually required for installing in service the dust caps associated with the valve stems of pneumatic tires; to prevent the accidental displacement of said dust caps; and to simplify and cheapen the construction of the improved dust cap.

Dra/wings.

Figure 1 is a longitudinal section of a dust cap constructed and arranged in accordance with the present invention, showing in conjunction therewith a valve stem mentioned, the section being taken as on the line 1-1 in F ig. 2;

Fig. 2 is a cross section of the cap and stem, the section being taken as on the line 2 2 in Fig. 1.

Description.

Heretofore dust caps which have been employed for the protect-ion of valve stems, and for the parts of the tire associated therewith, have been furnished with a screw-threaded section of a pitch corresponding to the 'screw-threaded sections 9 on the valve stem, and at either side of the Hat faces 10 to secure the proper alinement thereof in service. rlhe time required to screw the dust cap down over the relatively long stem has been considerable, with the result that it has added a great deal to the time necessary for the inflation of tires of the character mentioned. rlhis difficulty has been one that the automobilist has found irksome, with the result that in many instances the dust caps have been omitted, either intentionally or unintentionally, after the tires have been inflated.

To avoid this the present dust cap slides over the stem and does not engage directly the threaded sections 9. The threads of these sections 9 are, however, utilized as engaging points for a rubber packing or arovided on the said stems J jack 11, which isdisposed within the housing section 12 on the dust cap. The section 12 is increased in diameter over the section 13, and provides at the junction therewith, a shoulder 14 to form an abutment against which the or crowded. The jack is compressed by a ram 15, which is externallyy threaded to enwage an internal thread provided within the housing section 12. As seen best in Fig. 2 of the drawings, the ram 15 has an elongated opening 16, shaped in correspondence with the valve stem having parallel sides for a sliding lit on the flat sides 10 of the valve stem, The ends of the opening 16 are extended to avoid the threaded sections 9 of the valve stem.

From the foregoing it is obvious that when the rubber jack 11is not compressed, the dust cap may be moved lengthwise of the valve stem at will, there being none other than a free sliding yengagement between the dust cap and the valve stem.

When, however, the dust cap is rotated about the ram 15, the ram is caused to travel within the housing section 12 toward the shoulder 14 by reason of the screwthread engagement existing between said housing and the said ram.

rlhe rubber gasket or jack 11 is thereby compressed lengthwise, the material thickening or expanding laterally in compensation therefor. The inner wall of the. .jack 11 crowds upon and lits into the threads of the sections 9, thereby anchoring the dust cap to prevent the lengthwise Inovement thereof in the valve stem. A half turn of the dust cap is usually suflicient to compress the jack 11 sufliciently to force the same into engagement with the stem. lf closer engagement is desired, this is obtained by continuing the rotation of the dust ca To avoid adhesion ofthe gasket or jack 11 to the ram 15, with the consequent tendency to drag or twist the said gasket or jack,there is provided a thin metal washer' 17, which operates as a shoe or protective facing Vfor the said ack.

Vhen it is desired to remove'the dust cap the said cap is reversely rotated to cause the ram 15 to travel toward the retaining flange 18 with which the housing 12 is provided, The iiange 18 is spun over the chamber formed by the housing 12 jack 11 is pressed PATENT @FFICE;

Y Specification of Letters Patent. Pdgqgnijd July iglg, Application filed March 25, 1920. Serial $10,368,492. 4 i v body closed said stem;

Thereafter the said i'am is prevented 'fromn passing out of the said housing.

Y Y Claims;

LA dust Cap for service with `a pneumatic valve embodying a mutilated cylindrical steimsaidcap comprising a tubular at one end for enfolding freely an open-ceiitered'ram held perf manently in said body, the opening `in said ram being shaped in eoriespondenee'with said stem for noiieiotatively' -to move freely lengthwise thereover; an open-centered yielding packing member vsupported Within' said body and for distention to engage said stem; means operatively connecting said body said body is rotated.

matie valve embodying zlated Cylindrical stem, said cap comprising holding said ramon said vstemV and said' ram for moving said body toward said ram for distending said member When for servieerwith a pneu` a threaded muti- 2. A dust Cap a tubular body closed at one end for enfolding freely said stem; an open centered ram permanently mounted in said body and having screw-thread engagement there- With, said raml being adapted to movef freely lengthwise of said stem and to be held non-iotatively thereby;

packing member interposed( between said ram and said cap to be compressed thereby and means for preventing an edge of said packing member from'engafring said stem.

f WiLLiAM l o; VVRTTas.

a soft bodied Y

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