US 3498641 A
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March 3, 1970 c. 1. BOHLEN SPRING WIRE LOCKING DEVICE FOR A COUPLING Filed March 15, 1969 mdI 1 INV ENTOR CHARLES BOHLEN mm 2 mm NF mm mm on wn ow ATTORNEYS v United States Patent 3,498,641 SPRING WIRE LOCKING DEVICE FOR A COUPLING Charles I. Bohlen, Doylestown, Pa., asslgnor to Hose Accessories Co., Philadelphia, Pa., a corporation of enns lvania P Filed Mar. 13, 1969, Ser. No. 807,024
Int. Cl. F16! 55/00, 15/00 US. Cl. 285-84 2 Claims ABSTRACT OF THE DISCLOSURE In a coupling having a pair of opposed bodies secured together by relative rotation, a pair of spaced guides for a wire are provided on one body and a third guide is provided on the other body to be coaxial with the first two guides when the coupling is in the interlocked position. A spring wire has a straight portion carried in the aforesaid guides and a coil portion extending from the straight portion and partially about said one body wh1ch has means to slidably engage the wire adjecent its free end.
Background of the invention Couplings, such as universal air couplings, which are interlocked by relative rotation of the coupling bodies are well-known to the art. It is also well-known to provide a spring wire passing through an opening in one body into an opening in the other body of the coupling to prevent the relative rotation of the coupling bodies. The heretofore employed spring wire locks are difiicult to use due to inadequate guiding of the portion of the wire which engages both bodies of the coupling. In addition, due to the employment of multiple spring coils which in many embodiments have to be threaded onto a coupling body there is great difficulty in initially securing the spring wire to the coupling body which carries it. Further, the use of multiple coils of spring wire makes the prior art devices relatively expensive. These problems are all solved by this invention.
Summary of the invention In accordance with the invention, the prior art spring coil locks are markedly improved by providing a pair of spaced guides integral with one body and each having an opening with an axis parallel to the common axis of the coupling bodies for the reception of and guidance of a wire and a guide integral with the other body having an opening coaxial with the openings in the guides of said one body when the coupling bodies are rotated to the locked position. A spring wire having a straight portion carried in the guides of said one body is adapted to enter the guide of said other body. The spring wire has a coil portion extending from the straight portion and partially about the said one body. The free end of the coil portion engages means to slidably engage the wire. The means slidably engaging the wire advantageously comprises a lug having a wire reciving groove and means to keep the wire in the groove.
Description of the drawings FIGURE 1 is a side elevation partially broken away of a spring Wire locking device in a coupling in accordance with the invention.
FIGURE 2 is a vertical section taken on the plane indicated by the line 2-2 in FIGURE 1.
FIGURE 3 is an elevational view of the coupling body of the device of FIGURE 1 which carries the spring wire.
Preferred embodiment A universal air hose coupling 2 has a body 4 provided with a hexagonal section 6 for engagement by a wrench and is adapted to co-operate with a body 8 having a portion 10 adapted to engage a length of hose. Each body 4 and 8 has a pair of locking members 14 each of which has an enlarged recessed portion 16 and a smaller recessed portion 18 bordered by a cam face portion 20 (FIGURE 3). The locking members 14 on body 4 engage the locking members 14 on body 8 on the relative rotation of the bodies about their common axis to lock the bodies together. Body 4 carries a gasket 22 which co-operates with a gasket 24 carried by body 8.
The coupling bodies are normally sand or investment cast and will be of suitable material, such as, for example, ductile iron, malleable iron or non-ferrous metals, such as brass, aluminum, bronze, or high impact strength plastic material.
As thus described the coupling 2 is an entirely conventional universal air hose coupling.
In accordance with the invention, body 8 is provided with spaced lugs 30 and 32 having openings 34 and 36 respectively which are coaxial on an axis parallel to the axis of bodies 4 and 8. Openings 34 and 36 are adapted to receive and guide straight portion 38 of a spring wire indicated at 40. Wire 40 has a coil portion 42 which extends about half way about peripheral portion 44 of body 8. Adjacent its free end 46 wire 40 is slidably retained in a groove 48 of a lug 52 forming an integral part of body 8. The portions 54 and 56 of lug 52 adjacent the outer end of groove 48 are peened over to prevent the Wire 40 from moving outside of groove 48, but permitting the wire 40 to slide inside groove 48 with respect to lug 52.
Body 4 is provided with a lug 60 having an opening 62 for the reception of straight portion 38 of wire 40, opening 62 being coaxial with openings 34 and 36 when bodies 4 and 8 are rotated into the locked position.
Operation Because of the construction of the invention, it is a simple matter to assemble wire 40 to body 8. The coil portion 42 is expanded to provide for clearance of body 8 and the straight portion 38 is advanced through openings 36, and 34 in lugs 32 and 30 respectively. Not only does the short extent of the coil portion 42 result in a substantial cost saving, but also it permits the more facile expansion during the attachment to body 8 as against a multi-coil arrangement.
With straight portion 38 installed, the coil portion 42 is introduced into groove 48 in lug 52 and portions 54 and 56 peened so as to retain wire 40 in groove 48, but still permit Wire 40 to slide relative to lug 52. As thus installed, the inherent set in wire 40 urges the straight portion 38 to the position shown in FIGURE 1.
In order to mate body 4 to body 8, looped portion 66 of wire 40 is engaged by hand and urged to withdraw straight portion 38 within the confines of lug 30. Body 4 is then mated with body 8 and rotated for interlocking by locking members 14. When bodies 4 and 8 are locked together by locking members 14 openings 63, 34 and 36 will be coaxial and the release of spring wire 40 results in the straightened portion 38 entering into but not protruding beyond opening 62 of lug 60 to prevent the relative rotation of bodies 4 and 8.
The employment of lugs 30 and 32 to guide the straightened portion 38 of wire 40 eliminatesv the cocking or angulation of straightened portion 38 which occurs in the prior art structures and the coil portion 42 accommodates by shifting slightly about peripheral portion 44.
It will be understood that the above described embodiment is by way of illustration and is not intended to be limiting.
1. In a coupling having a pair of opposing hollow bodies having a common axis and each having a locking member adapted to engage a locking member on the other body on relative rotation of the bodies about their common axis the improvement comprising:
a pair of spaced guides integral with one body and each having an opening with an axis parallel to the common axis of the bodies for the reception and guidance of a wire;
a guide integral with the other body having an opening coaxial with the guides of said one body when the bodies are rotated to the locked position;
a spring wire having a straight portion carried in the guides of said one body and adapted to enter the opening of the guide in said other body;
said spring having a coil portion extending from the straight portion partially about said one body; and
means to slidably engage the wire adjacent the free end of the coil portion;
said coil portion biasing the straight portion into the opening of the guide of said other body.
2. The structure of claim 1 in which the slidably engaging means comprises a lug integral with said one body and having a wire receiving groove and means to keep the wire in the groove.
References Cited UNITED STATES PATENTS 653,143 7/1900 Martin 285-305 X 1,681,444 8/1928 Stevens 28581 X 1,691,851 11/1928 McCuean 28581 DAVID J. WILLIAMOWSKY, Primary Examiner D. W. AROLA, Assistant Examiner U.S. Cl. X.R.