Pallet tiering frame with wedge joint

May 3, 1966 l. f. skubic 3,249,072

PALLET TIERING FRAME WITH WEDGE JOINT Filed Nov. 15, 1965 3 Sheets-Sheet 1

<img file="US3249072A_D0001.tif" />

<img file="US3249072A_D0002.tif" />

May 3, 1966

L. F. SKUBIC

3,249,072

PALLET TIERING FRAME WITH WEDGE JOINT

Filed Nov. 15, 1965 3 Sheets-Sheet 2

<img file="US3249072A_D0003.tif" />

Attys,

May 3, 1966

L. F. SKUBIC

3,249,072

PALLET TIERING FRAME WITH WEDGE JOINT

Filed Nov. 15, 1965

Sheets-Sheet 3

<img file="US3249072A_D0004.tif" />

United States Patent Office

3,249,072

Patented May 3, 1966

3,249,072

PALLET TIERING FRAME WITH WEDGE JOINT Leroy F. Skubic, Long Beach, Ind., assignor to The

Paitier Corporation, Michigan City, Ind., a corporation or Illinois

Filed Nov. 15,1965, Ser. No. 507,731 5 Claims. (Cl. 108—53)

The present invention relates generally to load supporting pallet tiering frames, and more particularly to such a frame having an improved interlock device for securing together two main portions of the frame.

It is an object of the invention to provide a pallet tiering frame of the character set forth which can be quickly and easily assembled on a pallet, while providing an unusually rigid engagement between the main parts of the frame. It is a related object to provide a frame of the above kind which is of simple, rigid construction and economical to make and use.

Another object is to provide a pallet tiering frame as characterized above which is capable of preventing undesirable movement between the cross members of the frame without the need for bolts or other conventional fastening devices.

A further object is to provide a pallet tiering frame of the above kind that is compact in design and will not interfere with the support of a second pallet placed upon the tiering frame.

Other objects and advantages of the invention will become apparent from the attached detailed description and upon reference to the drawings, in which:

FIGURE 1 is a perspective view of one type of pallet tiering frame embodying the present invention;

FIG. 2 is a perspective view of the pallet tiering frame shown in FIG. 1 with one U-shaped member of the frame disassembled;

FIG. 3 is a perspective view of one member of the interlock device of the present invention.

FIG. 4 is an enlarged fragmentary sectional view of the member shown in FIG. 3, taken in the plane of the line 4—4;

FIG. 5 is a perspective view of the other mating member of the interlock device of the present invention;

FIG. 6 is an enlarged perspective view of the interlock device in disassembled condition, as shown in FIG. 2;

FIGS. 7 and 8 are enlarged fragmentary sectional views of the disassembled interlock device shown in FIG. 6, taken in the planes of lines 7—7 and 8—8, respectively.

FIGS. 9 and 10 are enlarged fragmentary sectional views of the assembled interlock device shown in FIG. 1, taken in the planes of the lines 9—9 and 10—10, respectively; and

FIG. 11 is a perspective view of another type of pallet tiering frame also embodying the present invention.

While the invention is susceptible of various modifications and alternative forms, certain specific embodiments thereof are shown by way of example in the drawings and will be described herein. It should be understood, however, that it is not intended to limit the invention to the the particular forms disclosed, but, on the contrary, the invention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as expressed in the appended claims.

Referring more specifically to FIGS. 1 and 2, the invention is there exemplified in an illustrative tiering frame 10 mounted on a conventional wood pallet 11. In this instance, the pallet 11 includes' a plurality of stringer members 12 which are parallel to each other and laterally spaced. Deck boards 14 are fastened transversely to the stringers 12 on either side thereof. In the exemplary pallet, a stringer is positioned at each end of the deck boards with one in the middle, although the number of stringers and deck boards may vary depending upon the loads and usages for which the pallet is designed.

The tiering frame 10 is adapted to be detachably mounted on the pallet 11 in such manner that it can be 5 quickly and easily assembled and disassembled, and when assembled will provide rigid support for one or more additional pallets in tiered relation to the first pallet. The tiering frame 10 comprises a pair of U-shaped support members 15, 16 each having a pair of legs 17 which 10 are secured to the opposed ends of respective crossbars 18, 19. In the illustrated form, the legs and crossbars are made of hollow cylindrical tubing and are secured together by an appropriate means such as welding.

Provision is made for detachably secured the two U15 shaped members 15, 16 to each other by means of an interlock device interposed between the crossbars 18, 19 (FIGS. 1, 2, 6, 9 and 10). The device 20 is of sturdy, rigid construction and comprises interlock members 21, 22 which engage each other complementally so as to re20 sist horizontal sliding movement between the crossbars 18, 19 when the frame 10 is assembled and loaded. The interlock device 20 further permits the two crossbars to lie in the same plane substantially parallel to the pallet so that a second pallet easily may be stacked in tiered rela25 tion to the first.

As shown more particularly in FIGS. 5, 6 and 8, the interlock member 20 is situated centrally of and in the general plane of the crossbar 18, being dimensioned so as not to project above the latter. The member 20 is of 30 bridge-like form, comprising a relatively heavy central portion 23 straddled by a pair of axially spaced bosses or hubs 24. These elements define a transverse trough 25 in the member 20 having tapered sidewall bearing surfaces 26 and a horiozntal bearing surface 27 located ap35 proximately along the central axis of the member 20 and crossbar 18. Relief grooves 28 may be provided along each side of the horizontal surface 27 adjacent each surface 26 so as to avoid possible interference with a mating interlock member at the corners of the trough and there⁴⁰ by insure an even bearing between the surfaces of the two members. To save material and help reduce the cost of the member 20, spherical recesses 29, 30 may be formed at the center of the horizontal bearing surface 27 and at a corresponding position on the opposite side of ⁴⁵ the member 20, respectively.

In order to provide a more rigid joinder between the crossbar 18 and the interlock member, the ends of the hubs 24 are tapered as at 31 and adapted to be partially inserted into the hollow cylindrical ends of the crossbar ⁵⁰ sections, as shown in FIG. 8. The ends of the two halves of the crossbar 18 are welded to the respective hubs 24 along the periphery of their tapered ends 31. In some instances, the ends of the crossbar sections may have a slight inwardly projecting radial dimple as a result of be55 ing punch-cut. To accommodate such tube ends, the member 20 may be formed with a pair of longitudinal grooves 33 along its top surface (FIGS. 6, 8 and 10).

Turning now to the mating interlock member 22, it will be noted upon reference to FIGS. 3, 6 and 8 that the 60 same is situated centrally of and in the general plane of the crossbar 19, being dimensioned so as not to project appreciably above the latter. The member 22 is formed as a relatively heavy channel disposed transversely of the crossbar 19. A longitudinally extending tapered block 32 65 is mounted so as to extend between the leg portions 34 of the channel member 21 and in this instance is formed as a heavy sheet metal stamping welded as at 35 to the legs 34. The block 32 is shaped to define thereon a horizontal bearing surface 36 and tapered side bearing sur70 faces 38 complementary to the bearing surfaces 26 formed in the trough of the member 21.

3,249,072

The leg portions 34 of the channel-shaped interlock member 22 are formed with a plurality of protruding embossments 39 located in such manner that the inside diameter 40 of the hollow tubing of the crossbar 19 fits snugly around the configuration of such embossments. The embossments 39 thus serve to position the two halves of the crossbar 19 on the respective legs 34 of the channel member 22. They also provide supplementary support for the welded joint between each leg portion of the channel and its respective section of the crossbar 19.

In actual use, the two U-shaped members 15, 16 comprising the tiering frame 10 are mounted to the pallet 11 in such a manner that their leg portions 17 are perpendicular to the base of the pallet and the two crossbars 18, 19 are perpendicular to each other. Under these conditions, the tapered block 32 of the channel-shaped interlock member 22 is disposed in mating, bearing relation with the surfaces 26, 27 of trough 25 in the interlock member 21. In this case, the channel-shaped member 22 happens to the bottom member of the joint with the member 21 located on top, although the reverse order also could be used. The crossbars 18, 19 intersect in rigid engagement in a common plane which is substantially parallel to the base of the pallet 11, thereby providing a secure base upon which a second pallet may be supported. Furthermore, since the interlock members are formed so as to be substantially within the plane of the crossbars, there is no undesirable protuberance caused by the joint which would interfere with the support of the second pallet.

As shown in FIGS. 9 and 10, the bearing surfaces 26, 27, 36, 38 of the interlock members 21, 22 accurately mate to form a compact joint adapted to resist sliding movement between the two portions of the joint. The tapered surfaces 26, 38 permit the interlock members 21, 22 to be readily engaged even though these two members may be slightly misaligned during assembly, the tapered surfaces causing these members to be forced into mating position. The assembly or disassembly of the frame is accomplished quickly and easily, without need for manipulation of bolts or other conventional fastening devices.

It also should be appreciated that interlock members 21, 22 are of a sturdy and rigid construction adapted to resist bending forces when a load is applied to the tiering frame. The member 21 is a husky member of substantial thickness, while the channel-shaped member 22 is fitted with a wedge-shaped block 32 which acts as a reinforcing element to counteract compressive forces against the legs 34 when the member 22 is located in the bottom position of the joint as shown in the drawings. In addition, since the horizontal bearing surfaces 27, 36 of the interlock members are both approximately on the common axial plane of crossbars, an undue concentration of stresses on either interlock member is prevented.

In the form illustrated in FIGURES 1 and 2, the legs 17 of the U-shaped members 15, 16 are mounted to the pallet 11 at the midpoints of its sides. The legs 17 may be secured to the pallet by any appropriate detachable connection. In this case, mounting brackets 45, 46 are used for this purpose, each having a flat transverse web portion 48 to which a corresponding leg may be welded. The web 48 presents a flat surface to the face of the deckboard or deckboards on which it is mounted, thus distributing the vertical load over an area greater than the diameter of the leg.

The two brackets 45 located in the middle of the deckboards 14 are provided with a pair of L-shaped flanges 49 on each side of the middle stringer 12 which extend downward from the web 48 and hook under the deckboard. To keep the bracket 45 from sliding away from its position embracing the deckboard 14 while straddling the stringer 12, a locking pin 50 is provided which is mounted to the leg 17 by a ring in such a manner that the pin may pass through a hole in the bracket 45 and deckboard 14. The brackets 46 on the other two legs located at the ends of the central deckboards 14 are provided with an outside flange 51 mating against the end of the deckboards and also with a second flange, not shown, on the opposite side of the web 48 having a finger portion extending under the deckboard to secure the bracket from upward movement.

Another form of tiering frame 10α in which the interlock device of the present invention may be employed is shown in FIG. 11. The U-shaped members 15α, 16α with crossbars 18α, 19α, interlock device 20α, and interlock members 21α, 22α, are similar to those described above. In this case, however, the legs 17α of the Ushaped members are mounted at the corners of the pallet 11α. The brackets 46α also are substantially similar to those used at the ends of the deckboards described above.

It should be appreciated that although the crossbars and legs have been described as being made from cylindrical tubing, rectangular tubing or other appropriate structural members could be used equally well.