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Publication numberUS3203548 A
Publication typeGrant
Publication dateAug 31, 1965
Filing dateMay 3, 1962
Priority dateMay 3, 1962
Publication numberUS 3203548 A, US 3203548A, US-A-3203548, US3203548 A, US3203548A
InventorsRoubal Alexander J
Original AssigneeAllis Chalmers Mfg Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Gib and cotter bolt assembly
US 3203548 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Aug. 31, 1965 A.-J.-ROUBAL 613 AND (POTTER BOLT'ASSEMBLY Filed May 5, 1962 3 .J/ M A E 4 .MJ 2 x 9 2 T2 5 5 w My m. 2 mm 7 6 \L United States Patent 3,203,548 GIB A'ND (TO'ITER BOLT ASSEMBLY Alexander J. Roubal, Milwaukee, Wis., assignor to Allis- Chalmers Manufacturing Company, Milwaukee, Wis. Filed May 3, 1962, Ser. No. 192,197 1 Claim. '(Cl. 209-399) This invention relates to gib and cotter bolt assemblies and particularly to such assemblies that may be used for such as holding down decks or tensioning cloths in vibrating screens or similar equipment.

While cotter bolt assemblies are used in many different types of applications, a common usage is as a fastening or tensioning device Where periodic removal is necessary. The cotter boltassembly finds advantageous usage in these types of applications primarily because of the speed and simplicity of assembly and disassembly.

Prior to this invention it was necessary for many users of cotter bolts to stock a large number of different length sizes. This was necessary for several reasons. One reason was that various sizes were necessary because of the varied sizes of machines in which the wedge bolt assemblies were used. Another reason stocks of different size bolts were necessary was because the use of the wedge bolt assembly in such as tensioning devices required a periodic tightening as the tensioned material stretched from its initial dimensions beyond that which could be remedied by the tightening allowed by further insertion of the wedge. When a cotter could be driven no further into the cotter way, it was necessary to remove the entire cotter bolt assembly and replace it with an assembly of shorter effective length so the desired tension could be provided.

An object of the present invention is to provide a cotter bolt assembly that can be incrementally adjusted to provide variations in its effective length without removing the cotter bolt from structure in which it is mounted.

Another object of this invention is to provide a cotter bolt assembly that will function properly, even in a vibrating structure, at any angle that it may protrude through framework structure.

This invention accomplishes the stated objects by providing in a cotter bolt, a cotter way that receives not only the cotter but also receives a gib of unique design and function. The gib is movable or rotatable about an axis perpendicular to both the shaft and the cotter way so that various selected positions of the gib determine different effective lengths of the bolt. Thus, a simple movement of the gib extends the range of tensions that a single size cotter bolt can apply to such as the cloth deck of a vibrating screen and without any change of parts.

Different size gibs may, of course, be stocked for utilization with a single size cotter and bolt to even more greatly vary the effective length of such assemblies and to do so will also be less expensive than stocking many sizes of cotter bolts. To enable the cotter bolt assembly to securely hold together with little regard to the angle between the cotter and the axis of the bolt, the outer surface of the gib that comes in contact with the cotter is of a continuous curved nature, such as an outer edge of a thin and flat C-shaped gib, so that at whatever angle the bolt assumes to the cotter, the nature of the contact between the cotter and the gib is always essenially the same, i.e., a curved surface of the gib engaging a flat surface of the cotter.

Other features and objects of the invention that have been attained will appear from the following more detailed description of the invention with reference to the accompanying drawings, in which:

FIG. 1 is a fragmentary view of a vibrating screen illustrating a cotter bolt and gib assembly embodying this 3,203,548 Patented Aug. 31, 1965 invention, with the bolt of the assembly extending through framework of the screen;

FIG. 2 is a top view of a cotter bolt that may be utilized in this invention;

FIG. 3 is a plan view of the gib shown in FIG. 1; and

FIGS. 4, 5 and 6 are side views of the cotter bolt, partly in section, and showing the gib in three positions to vary the effective length of the cotter way and hence the effective length of the bolt itself.

Referring to FIGS. 1 and 2, there is shown a portion of a screen of such type as is used for example to dewater material or to separate coarse from finer particles by passing the material over a screen deck 1 which may be a perforated plate or meshed fabric. The deck may be positioned as shown by side panel 2 that has upper and lower portions, 2a and 211, respectively, angled with respect to the panel 2 for purposes that will appear as this description proceeds. The panel 2 is arranged within a frame 3 and mounted thereto in a manner that will be explained, A bracket 4 is attached to framework 3 and the bracket defines a channel 5 and portion 2a of panel 2 projects into channel 5 to engage bracket 4. Lower portion 2b of panel 2 engages the deck 1 to hold it down or when deck 1 is a fabric, portion 2b may engage the fabric so that a pivotal movement of panel 2 relative to bracket 4 in the direction that brings portion 2b closer to frame 3, acts to pull deck 1 tight and smooth. When such pulling on deck 1 to apply tension thereto is desired, a bracket 6 may be secured to deck 1. Bracket 6 defines a channel 7 and portion 212 of panel 2 projects into channel 7 to engage bracket 6 so that the pivotal movement of panel 2 can tension deck 1.

A pivotal motion is imparted to panel 2 by an assembly 10 that includes a cotter bolt 11 having a cotter way 12. The cotter bolt 11 passes freely through a hole in panel 2 and a head portions 13 on the inner end of the bolt engages the panel. The cotter way 12 is defined by a pair of end walls 14, 15 and a pair of side walls 16, 17 (see FIG. 2). A gib 20 thinner than the width of cotter way 12 is inserted in cotter way 12 in a manner that will be described later. A cotter 30 is inserted into cotter way 12 between the gib 20 and frame 3.

Referring to FIG. 3, the gib 20 is shown as having a C-shaped outer edge 21. The C-shape is defined by three principal portions, a cap 22, a trunk 23, and a foot 24. These three portions have straight inner edges 25, 26, 27, respectively, that are unequal radial distances from the outer edge 21.

Referring again to FIG. 1, the gib 20 is shown arranged with inner straight edge 26 of the trunk portion 23, engaging end wall 15. The cotter 30, which is inserted in cotter way 12 between gib 20 and frame 3, is driven downwardly to move the bolt 11 to the left as shown in FIG. 1. Such movement by bolt 11 will pull panel 2 to pivot the panel clockwise about bracket 4 and panel 2 will push down on deck 1 or when deck 1 is a fabric with, as shown, a bracket 6, the clockwise motion of panel 2 will tension the deck 1.

The manner in which gib 20 can be used to vary the effective length of cotter way 12 will be explained with reference to FIGS. 4, 5 and 6.

As shown in FIG. 4, cap portion 22 of the gib 20 is arranged in cotter way 12 with edge 25 in engagement with end wall 15 thus reducing the effective length of cotter way 12 from the distance between walls 14, 15 to the distance X between cap portion 22 and wall 14. The manner, in which a further reduction in the effective length of cotter way 12 can be achieved, is illustrated in FIG. 5.

As shown in FIG. 5, trunk portion 23 of the gib is arranged in cotter way 12 with edge 26 in engagement with end wall 15. Thus the eifective length of cotter way 12 is reduced from the distance X shown in FIG. 4, to the distance Y in FIG. 5, between trunk portion 23 and wall 14. The manner in which a still further reduction in the effective length of cotter way 12 can be achieved is illustrated in FIG. 6.

As shown in FIG. 6, foot portion 24 of the gib is arranged in cotter way 12 with edge 27 in engagement with end wall 15. Thus the effective length of cotter way 12 is reduced from the distance Y shown in FIG. 5 to the distance Z in FIG. 6 between foot portion 24 and wall 14. Thus the unique configuration of the gib shown in FIG. 3 provides for substantial variationin the effective length of cotter way 12 and the utility of any size cotter bolt and cotter is considerably broadened.

Still another unique feature of the gib shown in FIG. 3 is the provision of lip portions 28, 29 that project toward each other from cap portion 22 and foot portion 24 to define a space therebetween that is shorter than the length of edge 26 and the space between edges 25, 27. The particular utility of lips 28, 29 may be best understood with reference to FIGS. 4 and 6. FIG. 4 shows gib 20 arranged with lip 28 hooked under bolt 11 to resist any otherwise possible tendency for the gib 20 to pop out of cotter way 12, when such an assembly is applied to a vibrating screen in an arrangement exemplified in FIG. 1. FIG. 6 shows gib 20 arranged with lip 29 hooked over bolt 11 to resist any otherwise possible danger that the gib might be driven through and out cotter way 12 when the cotter is driven into the space 12 between foot portion 24 and wall 14,

From the foregoing it can be seen that the described gib, gib-cotter-bolt assembly, and gib-cotter-bolt screen assembly are each possessed of unique advantages. However, modifications and equivalents such as readily occur to those skilled in the art are intended to be included within the scope of this invention and thus the scope of the invention is intended to be limited only by the scope of the claim appended hereto.

Having now particularly described and ascertained the nature of my said invention and the manner in which it is to be performed, I declare that what I claim is:

In a vibratory apparatus having a frame, a panel within said frame connected to said frame for pivotal motion relative thereto, a cotter bolt having a cotter way extending therethrough, said cotter bolt engaging said panel and projecting out through said frame to an extent that places a portion of said way on the side of said frame opposite said panel, a cotter in said way and engaging the side of said frame opposite said panel, and a gib in said way between said cotter and an outer end wall of said way, said gib having a continuously curved C-shaped outer edge surface and cap, trunk and foot portions each having an inner flat surface a different distance from the outer edge surface, each of said inner fiat surfaces being selectively engageable with said outer end wall, and each of said inner surfaces upon engagement with said outer end wall presenting a different portion of said outer edge surface of said C-shaped gib to engage said cotter a different distance from said outer end wall, and the ends of said cap and foot portions remote of said trunk portion each having lip portions spaced apart from each other a distance less than the remainder of the cap and foot portions to insure said gib remaining in place between said cotter and said outer end wall.

References Cited by the Examiner UNITED STATES PATENTS 597,143 1/98 Everitt 209-403 1,371,396 3/21 Reveny -7 1,461,195 7/23 Meyer 85-7 1,737,091 11/29 Northey 857 2,514,965 7/50 Pierre 248354 2,813,629 11/57 Brugmann 209-403 FOREIGN PATENTS 1,115,205 10/60 Germany.

685,024 12/52 Great Britain.

HARRY B. THORNTON, Primary Examiner.

EDWARD 1. MICHAEL, Examiner.

Patent Citations
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US597143 *Aug 24, 1897Jan 11, 1898OscarRobert j
US1371396 *Mar 15, 1920Mar 15, 1921Reveny Charles GBolting-up device
US1461195 *Oct 15, 1920Jul 10, 1923Waldemar MeyerFastening means for ships' plates
US1737091 *Nov 4, 1927Nov 26, 1929Northey Rodney VGib and wedge key for key bolts
US2514965 *Feb 25, 1947Jul 11, 1950Etancon Compense LMetallic mine stanchion
US2813629 *Oct 14, 1955Nov 19, 1957Brugmann John BScreen support
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3469695 *Oct 20, 1967Sep 30, 1969Greeninger Carroll DScreen-tightening apparatus
US3795311 *Mar 23, 1973Mar 5, 1974Universal Oil Prod CoMounting assembly for vibrating screen deck
US3870630 *Aug 15, 1973Mar 11, 1975Rock Ind Machinery CorpScreen tensioning device
US4137157 *Oct 12, 1976Jan 30, 1979Deister Machine Company, Inc.Screen tension assembly for vibratory screening apparatus
US4529510 *Nov 15, 1982Jul 16, 1985Johnson Louis WShaker screen
US4735712 *May 15, 1986Apr 5, 1988Herren Harold LMethod of producing wear layer on screen rail and screen rail having wear layer so produced
US5143223 *Nov 7, 1991Sep 1, 1992Harold HerrenReinforced screen rail
US5224606 *Sep 14, 1992Jul 6, 1993Lawrence GundersonInflatable bladder type of screen tensioning device
US5785461 *Jan 18, 1996Jul 28, 1998Lambert; Gene F.Wedge tensioning device
US6325581Oct 5, 2000Dec 4, 2001Joseph AbellSteel setting device
US8225938 *May 13, 2009Jul 24, 2012Sandvik Intellectual Property AbFixing of screening media
US8857623 *Apr 29, 2011Oct 14, 2014Michael D. WisemanScreen retainer having adjustable tensioning
US20090285049 *May 13, 2009Nov 19, 2009Sandvik Intellectual Property AbFixing of screening media
US20120273398 *Apr 29, 2011Nov 1, 2012Wiseman Michael DScreen retainer having adjustable tensioning
WO2012149437A1 *Apr 27, 2012Nov 1, 2012Wiseman Micheal DScreen retainer having adjustable tensioning
U.S. Classification209/399, 254/29.00R, 209/405, 411/355, 140/109, 209/403
International ClassificationF16B2/14, F16B2/02
Cooperative ClassificationF16B2/14
European ClassificationF16B2/14