US1645934A - Locking device for telescoping elements - Google Patents

Description

J. SCHADE oct. -1s. 1927.

LOCKING DEVICE FOR r'I'ELESCOPING ELEMENTS Fiied Feb. 5, 1927 EIC-rml.-

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Patented Oct. 18, 1927.

UNITED STATES 1,645,934 PATENT OFFICE."

JOHNHSCHAIDE, OF IIOLYOKE, MASSACHUSETTS, ASSIGNOR T NATIONAL BLANK BOOK `COMPANY, OF I-IOLYOKE,*MASSACHUSETTS A VOLUNTARY TRUST ASSOCIATION OF COPARTNEESI-IIP HAVING AS VTRUSIEES F. B. IOWNE, E. S. TOWNE, J'. M. TOWNE,

AND F. W. WILSON.

LOCKING DEVICE FOR TELESCOPING ELEMENTS.

`Application filed February 3, 1927. Serial No. 165,548.

This invention relates to locking means for fiat telescoping elements. and has for its object to simplify and improve upon the Construction shown and described in my Letters Patent No. 1,542,841,`"issued lune 23,

Another object of the invention isto provide very simple and effective means of this description, not likely to get ont of order and readily applied for use. y

Further objects of the invention will appear from the yaccompanying description supplemented by the drawings in' which latter Figurel is a. plan View showing the inventionapplied to kan ordinary loose leaf ledgerf q Figure 2 isa section at the line Z-) of Figure 1'with the 4sections locked- Figure 3 is a section at the line 3 3 of Figure 2- Figure 4 isa view similar to Figure-Q showing the sect-ions unlocked- Figure 5 is a section at the line 5-5 of '25 Figure 4r- Figures 6 and 7 are sections at the line (3i-6 of Figure 3, with the sections respectively lockedand unlockedv 1 FiguresS and 9 are brokenfviews, similar to Figures 4 and 2, but showing modifications of the invention with the sections respectively unlocked and locked, and

Figure 10 is a detail broken sectional elevation on an enlarged scale similar to Figure 4; and showing the manner of supporting the spring.

Similar numerals of reference denote like parts in the several figures of the drawing.

While the invention is shown as applied to a loose leaf ledger, it is, of course, applicable to flat telescoping parts such as are used in various arts.

The parts of the loose leaf ledger will be briefly referred to without any detail description thereof since such parts lare well known.

1, 2, are the usual metallic Cheek pieces of the ledger, and to these cheek pieces are `respectively secured throughout their length the plates 8, 4, having the usual rectangularly disposed bottom portions 5, 6, which overlap each other in sliding relation.

The outer extremities of these bottom portions 5, 6, are bent upwardly at right angles so as to provide ends 7, 8, and terminate'at their upper edges in inwardly extending lla-Tiges 9, 10, the latter underlying the former in telesooping relation, and these flanges are normally spaced apart for the purpose hereinafter to be explained.

rlhe parts which have just been described yform a part of the Construction of an 0rljfvoted at 11 to the end 8 ofthe inner f telescoping element is a locking dog 12, and pivoted respectively to a. stud 13 carried by the lower outer end of said dog, and to a stud 14 carried by the end 8, arcguide blocks 15, 16, from which `ext-end respectively teats 17, 18, and these teats extend within the ends of a coil spring 19 whereby `the latter is held against accidental displacement and: is properly guided during the swinging movements of the locking dog, as

will be readily understood from Figure 10.

In the Vsimplest and therefore the preferred-form of the invention, as illustrated in the several figures of' the drawing, except vFigures 8 and 9, the pivotal point .13 on the dog will be carried above the pivotal point 11 of the dog itself, when the dog is swung to unlocking. position, and therefore the spring will function to preserve this unlocking position of the dog, asillustrated particularly at Figure Il, but when the dog is swung to locking position this point 13 will be carried below the point 11 and the spring i will then function to urge thisy dog into locking position, thereby increasing its bite in the manner presently to be explained.

Thus it will be seen that, in the preferred construction, the spring performs a double function. y

The dog extends upwardly vthrough an opening 2O formed by cutting away theV flange 10, and terminates in any suitable operating` linger piece 21 which extends above the flanges.

The outer edge of the .dog is eut away to Y form a gate 22 into which the flange 9 of the outer telescoping member normally eX- tends, as shown at Figures 3 and 5, and when the dog is swung to unlocking position this iiange will be spaced from the walls of the gate 22 as shown at Figures 5 and 7, but when the dog is swung in the reverse direction to locking position these gate walls will come in Contact with this flange both at its upper and lower edges, the cornei portions of these walls biting said edges, as shown at Figures 3 and 6, but this biting will be accentuated by the action of the spring 19 which will then be positioned as shown at Figure 2, and any attempt to separate theseA telescoping sections will only tend to increase the bite of the dog against this flange 9.

Since the dog is pivoted to the end 8 of the inner telescoping section the latter will be slightly raised when the walls of the gate 22 contact the fiange 9, as is shown particularly in comparing the position of parts shown respectively at Figures 2 and l, but the flange l() will never contact the iiange 9, and the inner teles'coping sections, when -the parts are locked as above described, will be substantially in a floating condition within the outer telescoping element.

It is not necessary that this spring i9 should perform the double function above set forth, and therefore, referring particularly to Figures 8 and 9, studs 23 and 24 are so located respectively on` the dog l2 and end Sthat the spring will only act to emphasize the locking position of the dog, and a plate spring 25, secured to a stud 26 carried by the plate 8, has leaves 27, 28, which bear respectively against the under side of the flange 10and against the flat seat 29 located on the dog 12, in order to hold the dog in unlocked position, as is shown at Figure 8.

When operating the dog to locking position this spring 25 will be forced upwardly, and as soon as the stud 23 has passed below the pivotal point l1 the coil spring will by its reactionforce the lower end of the lock ing dog downwardly so as to increase the bite of the walls of the gate 22 against the flange 9.

lVhile a coil spring has been shown and described for assisting the pivoted dog in functioning, it will be clear that any suitable form of spring element may be employed, the adaptation in the particular connection above described being a mattei' of mere mechanical skill.

What is claimed is y l. The hereindescribed means for locking together flat telescoping elements, comprising a locking member pivoted to t-he inner of said elements and having a gate Within which the outer element extends and capable of being swung into locking engagement with the latter and also into unlocking position free of said out-er element, and spring means for maintaining both positions of said member.

2. A locking means for fiat elements that are normally spaced apart and telescope one within the other, comprising al dog pivoted to the inner of said elements and having a laterally extending gate within which' the outer element is housed, the walls of said gate at their corners biting the opposite faces of said outer element when the dog-'is swung to locking position, and'spring means for maintaining said locking position.

3. A construction as in claim 2 further distinguished in that the corners of the gate bite the opposite faces of the outer element in staggered relation, and the 'telescoping elements are spaced apart when locked.

In testimony whereof I aliix my signature hereto.

JOHN SCHADE.

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