US1547304A - Casing for springs - Google Patents

Description

' July 28, 1925.

T. J. DENNISON CASING FOR: SPRINGS' Filed Nov. 22 1921 James flan/u 'san Patented July 28, 1925.

UNITED STATES PATENT O'FFICZE.

THOMASJAMES DENNISON, or MONTREAL, QUEBEC, CANADA, ASSIGNOR To LUBRI- GAITERS LIMITED, OF MONTREAL, QUEBEC. CANADA.

CASING FOR SPRINGS.

Application filed November 22, 1921. Serial No. 517,049.

To all whom it may concern:

Be it known that I, THOMAS JAMES DENNI- SON, a subject of the King of Great Britain, and resident of Montreal, Province of Quebec, Dominion of Canada, have invented cer-. tain new and useful Improvements in Gasings for Springs, and do hereby declare the following to be a full, clear, and exact description of the same.

This invention relates to casings employed to cover elliptical, semi-elliptical or quarterelliptical springs and enhance the lubrication thereof by confining the lubricating medium such as grease or oil about the spring and exclude moisture, dirt, grit or other foreign matter tending to neutralize or COUII'EGL act the lubricant. The casings referred to are made in sheet form and wrapped around the spring, the longitudinal edges of the sheet being secured together after application to form a tube-like enclosure surrounding the spring and are composed of leather, canvas or other pliable material capable of conforming to the curvature of the spring and of yielding to accommodate the movement of the latter in action, the material having the quality, especially when impregnated with the lubricant, of preventing the escape of the latter, excluding moisture or other foreign matter and in addition acting as a reinforcing means for the spring. Consequently the effectiveness of the casing depends to a considerable extent upon the security of the closure of its edges, and it is to this fastening that my invention particularly appertains.

In so far as I am aware, previous constructions have depended upon a straight abutting joint between the edges of the casing, combined with a tongue arrangement .but this construction is not calculated to secure the best results owing to the absence of a positive closure and to the likelihood of a gaping joint developing under movement of the spring or accidental loosening of the fastening means. It is an object therefore of the invention to provide a novel closure featuring a positivelapping joint, prefer ably, though not essentially combined with a tongue arrangement, whereby such a secure closure is obtained as tomini-mize the likelihood of the joint gaping or becoming insecure to the detriment of the casing as a whole. I

The above with further objects and advantages will be hereinafter more fully described and particularly pointed out in the appended claims. For full comprehension, however, of my invention reference should be had to the accompanying drawings forming a part of this specification, in which the reference characters indicate the same parts and wherein:

Fig. 1 is a perspective view, partly broken away, of a casing made according to my 'invention and applied to a quarter-elliptical laminated spring, the latter with the .casing being turned to expose the underside;

Fig. 2 is a bottom plan of the casing, the turned margin being broken away near .one end;

Fig. 3 is an interior plan View of the casing in flat condition;

Fig. 4 is a transverse section on line 44 Fig. 2;

Fig. 5 is a view similar to Fig. 4 and illustrating a reinforced closure;

Fig. 6 is a perspective view similar to Fig. 1 of a modified closure; and

Figs. 7 and 8 are further modifications of reinforced closures.

In the drawings 2 indicates in dotted lines a quarter-elliptical laminated spring and 3 the surrounding casing composed of a sheet of leather or suitable pliable material preferably with converging longitudinal edges 4 as shown in Fig. 3 so that when wrapped around the spring the casing will taper cor respondingly to the latter.

' In fastening the casing in position the edges 4 are brought into overlapped relation as distinguished from an abutting position, the longitudinal side margins 5 and .6 respectively, being bent outwardly in the form of an outwardly projecting seam with their adjacent surfaces in fiat engagement one with the other. Fastening means are provided to securely hold the margins in their overlapped positions, preferably by lacing,

strapping or buckling such margins together. For this purpose each margin is formed with a longitudinally extending inner row of perforations T correspondingly arranged so that in the applied position of the casing these holes are in substantial registration, a lace 8 being threaded through the registering holes longitudinally of the casing, drawn tight to form a snug joint and anchored at its opposite ends in a suitable manner.

In order to avoid the presence of an uncovered joint I prefer to form the holes of margin 6 a greater distance from its edge than is the case with margin 5 and to turn such margin 6 inwardly at 9 to overlap margin 5, thus forming a hem to cover the joint formed by the outwardly turned margins, the margins 5 and 6 and the turned over portion 9 of margin 6 being fastened in their three-ply position preferably by a second or outer lacing. For this purpose the margin 5 is formed with an outer longitudinally disposed row 10 of holes near its outer edge and the margin 6 with correspondingly arranged intermediate and outer rows of holes 11 and 12 respectively, near its outer edge, the intermediate row 11 being disposed in the outwardly turned portion of margin 6 and the outer row 12 in the inwardly turned portion 9 of the latter. In the closed portion of the casing the three rows 10, 11 and 12 are superimposed in substantial registration and a lace 1O is threaded therethrough longitudinally of the eas- The holes 7 are preferably staggered with relation to the outer and intermediate holes so that with the laces inserted the points of fastening are distributed along the joint so as to thoroughly close the latter.

The relative positions of the joined margins 5 and 6 forming a seam, and the inwardly turned portion 9 forming a hem, enable the laces 8 and 10 to be applied in the manner of stitching as distinguished from the conventional criss-cross lacing and establishes a closure avoiding an uncovered joint such as exists in a closure with abutting edges. Furthermore the laces pass through from surface to surface and so avoid the disposition of the laces between the adjacent surfaces of the overlapped margins to the end that said adjacent surfaces are maintained in flat intimate contact throughout the length of the casing. In addition the outwardly turned margins 5 and 6 of my improved arrangement form a V interiorly of the inner lace 8 and as shown in Fig. 4: thereby provides for easy expansion of the casing at this point in the event of extreme movement of the spring or for the accommodation of additional laminae.

It is preferred to combine a tongue with the above describe-d closure and as shown a strip 13 of leather or other suitable pliable material is secured along one edge only to the interior of the casing longitudinally thereof, the opposite edge of the strip being free and the strip of an extent to extend over the joint when the casing is applied. As shown this tongue constitutes an interior cover for the joint and combines with the portion 9, constituting an exterior cover for the joint, in most effectively closing the easing along its longitudinal edges. As seen particularly from Figs. 4 and 5 it is intended to position the closure of the casing beneath the spring to present a smooth water-shedding surface above the latter.

To secure a snug engagement of the ends of the casing about the spring and positively close such ends, strips l t of felt or similar material are located at the ends of the sheet composing the casing, such strips extending transversely between the rows of holes at the longitudinal edges of the sheet and being secured to the sheet preferably by stitching along their outer edges near the end edges of the sheet. The inner edges of the felt strips are thereby free and capable of effectively adapting themselves to the transverse contour of the spring to the end that a tight closure of the casing ends is secured. Inasmuch as these end strips are secured to the casing there is no necessity for preliminary adjustment thereof, the stitching maintaining them in position ready to be wrapped around the spring in common with the casing.

It is desirable to provide confining means at the ends of the casing to bind the latter to the spring and prevent creeping or the working of the casing along the length of the spring and while straps have heretofore been employed for this purpose I contemplate the provision of a fastening which develops a more positive engagement between casing and spring than is secured by means of a strap, my improved end anchoring means consisting in forming each end of the casing sheet with a row 15 of perforations arranged transversely of the sheet adjacent the end edge and utilizing these perforations to thread the laces 8 and 10 transversely around opposite ends of the casing, each lace being anchored at 16 at one end to one end of the casin and having its opposite end carried around the opposite end of the casing through the perforations 15 and suitably anchored at 17.

In the event of it being desired to provide a stronger closure for instance for use in connection with an extra heavy spring. the above described construction may be provided with supplemental flaps l8 sewed along one edge only to the exterior or interior of the casing longitudinally thereof near edges as shown in Fig. 5 and having their free edges folded inwardly to overlap each other and cover the overlapped margins 5 and 6. Theexterior flaps have two inner and two outer longitudinally arranged rows of holes 19 disposed, when the flaps are folded as described, on opposite sides -'of the margins 5 and 6, such holes l9 being adapted to substantially register with the perforations 9, 10, 11 and 12 and to have the laces 8 and 10 threaded therethrough in common with the holes of such margins 5 and 6.

As shown in Fig. 6 an effective overlapped closure may be secured by lapping one margin 20 of the casing over the other margin 21 in what may be termed the circumferential line of the casing. In this construction one lace only, indicated at 22, is utilized, the margin 21 having a single row of holes 23 and the margin 20 a double row 24 and the opposite ends of the one lacing serving to bind the ends of the casing to the spring.

What I claim is as follows 1. A casing for a spring and comprising a sheet of pliable material wrapped around the spring to cover the latter longitudinally, one longitudinal margin of the sheet presenting two longitudinally disposed rows of holes therein at different distances from the edge and the other margin having three longitudinally disposed rows of holes at different distances from the edge, said margins being bent outwardly in the form of an outwardly projecting seam with their adjacent surfaces in flat engagement with each other, the holes of the rows of one margin being in substantial registration respectively with the holes of the inner and intermediate rows of the other margin and the position of said margin with the third row of holes being turned inwardly to extend over the edge of the other margin and overlap the exterior surface of the latter with the third row of holes in substantial registration with the outer row of holes of said other margin, a lace threaded through one set of registering holes and anchored at its ends and a second lace threaded through the other set of registering holes and anchored at its ends.

2. A casing for a spring and comprising a sheet of pliable material wrapped around the spring to cover the latter longitudinally and presenting a row of perforations along each end near the edge thereof, one longitudinal margin of the sheet presenting two longitudinally disposed rows of holes therein at different distances from the edge and the other margin having three longitudinally disposed rows of holes at different distances from the edge, said margins being bent outwardly in the form of an outwardly projecting seam with their adjacent surfaces in flat engagement with each other, the holes of the rows of one margin being in substantial registration respectively with being turned inwardly to extend over the "edge of the other margin and overlap the exterior surface of the latter with the third row of holes in substantial registration with the outer row of holes of said other margin, a lace threaded through one set of registering holes and the said perforations at one end of the casing and anchored at its ends and a second lace threaded through the other set of registering holes and the said perforations at the opposite end of the casingand anchored at its ends.

3. A casing for a spring and comprising a sheet of pliable material wrapped around the spring to cover the latter longitudinally, one longitudinal margin of the sheet presenting two longitudinally disposed rows of holes therein at different distances from the edge and the other margin having three longitudinally disposed rows of holes at different distances from the edge, said margins being bent outwardly in the form of an outwardly projecting seam with their adj acent surfaces in flat engagement with each other, the holes of the rows of one margin being in substantial registration respectively with the holes of the inner and intermediate rows of the other margin and the portion of said margin with the third row of holes being turned inwardly to extend over the edge of the other margin and overlap the exterior surface of the latter with the third row of holes in substantial registration with the outer row of holes of said other margin, a flap secured at one edge to the exterior of the casing at one side thereof and extending over the lapped margins and a second flap secured at one edge to the exterior of the casing at the opposite side and extending over said first mentioned flap, such flaps each presenting four rows of holes in substantial registration with the two sets'of registering holes of the margins, a lace threaded through one set of registering holes and anchored at its ends and a second lace threaded through the other set of registering holes and anchored at its ends.

4. In a device of the character described, the provision of a sheet of pliable material having inner and outer longitudinally disposed rows of holes adjacent one longitudinal edge and inner, outer and intermediate longitudinally disposed rows of holes adjacent the opposite longitudinal edge, said holes being adapted to receive laces for fastening the longitudinal margins of the sheet together in a predetermined manner when the sheet is folded about a spring to provide a casing therefor.

5. In a device of the character described the provision of a sheet of pliable material and said holes being adapted to receive laces for fastening together the longitudinal margins of the sheet in a predetermined manner to hold the sheet in casing formation.

In witness whereof, I have hereunto set my hand.

THOMAS JAMES DENNISON.

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