US 1765239 A
Description (OCR text may contain errors)
June 17, 1930. 1. MEU RUN 1,765,239
RETAINING RING FOR srinume BOX 1.112s
Filed Dec. 22, 1928 INVEN'ROR [VAR 'MEURLING as is used in the Patented June 17, 1930 IVAR MEURLING, or RID'LEY PARK,
PENNSYLVANIA, ASSIGNOR TO THE VISCOSE COMPANY, OF MARCUS HOOK, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA RETAINING RING- FOR SPINNING-BOX LIDS Application filed December 22, 1928; Seria1 No. 327,900.
This invention relates to a device for holdlug-a lid in position on a spinning box such manufacture of rayon and thelike.
The simplest and the preferred form of lid fora spinning box is one which rests on a ledge on the inner wall of the box near its upper open end. The cover is then easily put in place and is equally easily removed, thus saving time in filling and emptying the box. While the box is being rotated, it is necessary to hold the lid securely in place.
While many lid retaining devices are known, none has been found which is unaffected, in its function of holding the lid securely in place, by thecentrifugal forces developed by the'rotation of the box. The importance of this factor will be appreciated when it is considered that these boxes are turned at from six to nine or more thousand revolutions per minute and that at such speeds the effect of centrifugal force must be considered even with reference to parts Whose mass is slight.
The object of this invention is to provide a device which will hold the lid on the box at high speeds of the order indicated, and whose effectiveness will not be impaired by i the centrifugal force incident to such speeds.
It is an'object as well to provide a device such as that just mentioned, which also may be manipulated to secure and to release the lid with great ease and without material loss of time. t
A preferred embodiment of the invention is describedhereinafter and is illustrated in the accompanying drawing. In the draw: ings,
'Fi ure lis a top plan view of a spinning box s owing the securingdevice inposition to hold the lid on the box.
Figure 2 is 'a view inelevation of the same box with a part shown in section, the section.
being taken on the line 2-2 of Figure 1.
The spinning box 10 may be of any suit able design. On the inner wall and near the open end of thebox is a ledge 11 extending 'fully around the box. The lid 12 which is a flat annulus rests on the ledge 11. Just above the ledge is a groove 13, approximately semi-circular in cross section, extending the lid.
rim 14 of the groove is flush with the uppersurface of the cover or in other words it is spaced from the ledge 11 the thickness of *To secure the lid in place on the ledge, I provide a split ring 15 formed from apiece of spring metal, circular in cross section, Whose total length is, not less than the length of the shortest circumference of the groove 13. In the form shown, this shortest circumference is that of the rim 14 Where the groove meets the inner wall of the box.
' The spring has portions which rest in the groove 13 and other portions which rest on the cover 12 holding it securely on the ledge. The ring is corrugatethbeing made up of a number of curves or arches which are preferably. rathersharp at the portions 16 which engage'the groove, These curves not only take up the excess length, permitting the ring to fit in the groove, but they also provide the laterally extending portions 17 which rest on the lid. 7
While the ring as a whole is described as being of spring metal,- short lengths of it are rigid and thus there is no tendency on the part of the lateral portions 17 to bend out grooves and the consequent reaction of the I lateral portions 17 against the lid is ample to hold the lid in place. v
The split in the-ring is made at a groove engaging portion and the ends of the ring piece are extended toward eachother as at 18 so that they have a good engagement with the groove. The spring ofthe material is only such as to give a tendency for the adjacent ends 18 to separate thus putting the Whole ring under compression when itis in place. The expansive tendency then serves to maintain the portions 16 in engagement with the groove.
When the box is rotated at the speeds customarily-used for spinning the rayon, there is a considerable centrifugal force created by reason of even-the small mass of the ring.
est circumference of the groove. As a COI'OIllary of this, the: circle which the ring tends to conform to, under the influence of the centrifugal force at high, speed, has a circumfere-nce greater than the smallest circumfer.
ence of? the groove, Stated differently, thex effective length of rod .inany arcuate por:-"
tion of. the ring-exceeds thelength of the corresponding are of the groove 13, by which is meant. the arcuate. length of groove engaged by the ring portion in question. The. result upon the device itself is that the ring engages the groove more tightly as the speed increases than when the box is at rest. The groove resists the tendency of the ring to become a true circle in form and so it maintains the lateral portions of the ring which rest over the lid.
This construction of ring is found to be particularly satisfactory in that its effectiveness becomes greater as the speed increases and'also in that the ringis' very easily removed to release the lid by; simply moving one ring end toward .the center until enough of the ring is free ofthe groove to permit it to be lifted away from the box. To facilitate the removal of the ring, the inwardly bent arch 15 near the split is bent upwardly from the lid-and therefore it may be grasped more readily than if it rested on the lid. The upwardlybent portion for this purpose is a known expedient, having been used with certain forms of four-corner rings. While I am not aware that it has ever been the fact,
it'is conceivable that such an upward loop with a four corner'or similar ring might be large enough to make the total length of rod forming the ring greater than the size of the groove, yet neither the underlying thought here nor the result attained by this invention would be present.- I therefore use the expression the effective length of the ring to denote the length that must not be less'than the circumference of the groove.
In the form shown here it is the length of the projection of the ring in the plane of the groove since-the projected length is not affected by curvature away from that plane.
It will be observed that the inwardly di-,
rected arches 19 are of such curvature and of such number that they offer good resistance to the tendency of the ring portions to conform to a common circle. When the number of such arches is about twelve as shown here the span of each one is slight and hence each is more rigid. Under these conditions,
the length of the ring may be substantially equal to the smallest circumference of the" groove since the relative rigidity of the short arches is such that the ring can not become a true circle at the speeds here concerned. The preferred construction however is one based on the concept thatthe effective length of the ring be greater than the circumference of the wall at the ring engaging region, for then the number of curves is not m'aterial.
I wish to include within the scope of the protection givenme all novel features disclosedv herein and all such variations of the disclosed embodiment as come within the fair scope of the following claims.
1 I claim 1. In a spinning box for rayon or the'like having an open end, a ledge on the. inner peber of curves forming groove engagingportions and lateral portions for resting over the lid, said ring having an effective length not less than the length ofthe circumference of the box wall at the ring engaging region. p
3. A split retaining ring adapted to rest over the lid of a spinning box and to engage the wall of said box, said ring having relatively rigid inwardly directed arches to the number of about twelve, the effective length of said ring being not less than substantially equal to the circumference of said box at the ring engaging region.
4. A corrugated split retaining ring for a spinning box, said ring having an effective length exceeding the circumference of the part .of the box wall engaged by the ring. 5. A corrugated split retaining ring for a spinning box, the effective length of rod in any arcuate portion ofthe said ring exceeding the lengthof the corresponding arc of the box wall engaged by the ring..
In testimony whereof I have signed-my V name to this specification.