US3343634A

US3343634A - Bracket for handle

Info

Publication number: US3343634A
Application number: US459801A
Authority: US
Inventors: Ervin H Goldman; John B Humphries
Original assignee: AMERICAN HANDLE SALES CO
Current assignee: AMERICAN HANDLE SALES CO
Priority date: 1965-05-28
Filing date: 1965-05-28
Publication date: 1967-09-26
Anticipated expiration: 1984-09-26

Description

Sept. 26, 1967 E. H. GOLDMAN ETAL 3,343,534

BRACKET FOR HANDLE Filed May 28, 1965 5 Sheets-Sheet 1 INVENTGQS. ERVIN H. GOLDMAN JOHN B. HUMPHRIES FIG.9

Cazaarmdfiwiaafiwm & C0160 ATTORNEYS.

P 1967 Y E. H. GOLDMAN ETAL 3,343,634

BRACKET FOR HANDLE Filed May 28, 1965 5 Sheets-Sheet 2 mvmToRs. ERVIN H. comm/m BY JOHN B. HUMPHRIES Cam,m,m1, & Com

ATTORNEYS.

Sept. 26, 1967 E. H. GOLDMAN ETAL 3,343,634

BRACKET FOR HANDLE Filed May 28, 1965 5 Sheets-Sheet s FIG. 8

INVENTORS. ERVIN H. GOLDMAN JOHN B. HUMPHRIES ATTORNEYS.

P 1,967 I E. H. GOLDMAN ETAL 3,343,634

BRACKET FOR HANDLE Filed May 28, 1965 5 Sheets- Sheet 4 lNVENTO ERVIN H. GOLD N BY JOHN B. HUMPHRIES 52 M146, W 8 Cofimu ATTORNEYS.

p 1967 1 E. H. GOLDMAN ETAL 3,343,634

BRACKET FOR HANDLE Filed May 28, 1965 5 Sheets-Sheet 5 FIG.2O

INVEN IORS. ERVIN H. GOLDMAN JOHN B. HUMPHRIES Cam,62wi4a,@wwwm (5 005a ATTORNEYS.

United States Patent C) 3,343,634 BRACKET FOR HANDLE Ervin H. Goldman, Philadelphia, Pa., and John B. Humphries, Stamford, Conn., assignors to American Handle Sales Co. (also known as American Handle Sales Company), Philadelphia, Pa., a corporation of Pennsylvania Filed May 28, 1965, Ser. No. 459,801 16 Claims. (Cl. 190-58) ABSTRACT OF THE DISCLOSURE A bracket for a handle which includes a mounting plate and a cover plate. The mounting plate has a top surface and dependent vertical side walls which project downwardly from the top surface. The vertical side walls taper upwardly from one end of the top surface. The cover plate includes a top surface and dependent vertical side walls. The vertical side walls on the cover plate ta er outwardly at the same taper as those on the mounting plate. The mounting plate includes at least one recess in each of the vertical side walls. The cover plate includes one inwardly projecting finger in each of the vertical side walls so that the cover plate can be secured to the mounting plate by sliding the tapering walls of the cover plate along the tapering walls of the mounting plate until the fingers are engaged in the recesses.

This invention relates to a bracket for a handle, and more particularly, a bracket to be used in securing handles to such items as luggage, radios, and television sets.

It is now a common practice in the art to secure handles to luggage and television sets by the use of a mounting bracket and a cover plate for the mounting bracket. Thus, the handle is secured to the mounting bracket which is in turn secured to the luggage or television set, or any other item of this type. Thereafter, all of the securement means are covered over by a cover cap which conceals both the secured ends of the handle and the mounting bracket. There have been a number of problems which have arisen with the prior art hardware used on handles. Thus, one of the problems has been that the cover plate would become loose during use and would therefore rattle. Additionally, many times the cover plate could easily be knocked off or removed in use, thereby necessitating replacing it or finding a replacement part if it is lost.

The bracket of this invention overcomes the prior art problems for hardware of this type. Thus, once the cover plate has been secured in place it will not be inadvertently removed. Additionally, the bracket and cover plate assembly are constructed in such a manner as to prevent any rattling of the cover plate during use.

In another aspect of this invention there is provided a novel linkage between a handle loop and the mounting hardware. Thus, in the past, the linking rings or loops which secured handles in place would quite often rattle in use. The assembly embodied in one form of this invention prevents any rattling of the link during use.

In still another aspect of this invention there is provided a novel method for securing a linking ring from a handle onto a mounting bracket. Using this method there is a substantial saving in time and labor in making the assembly of the mounting bracket and the handle.

It is therefore an object of this invention to provide a novel bracket for a handle.

It is another object of this invention to provide a novel combination of a handle linking loop and a mounting bracket therefor.

It is a further object of this invention to provide a novel method of uniting a linking loop for a handle and a mounting bracket.

It is a further object of this invention to provide a Patented Sept. 26, 1967 ice combination linking loop and mounting bracket therefor which will not rattle during use.

It is a further object of this invention to provide a novel bracket for a handle which greatly facilitates the securement of a covering cap on the mounting bracket.

It is a further object of this invention to provide a bracket for a handle which includes means for preventing the movement of a cover cap on a mounting bracket during use.

It is a further object of this invention to provide a bracket for a handle which is adapted to replace existing handle hardware without modifying the item on which the previous hardware was located.

It is a further object of this invention to provide a bracket for a handle which can easily be assembled onto an item.

These and other objects of this invention are accomplished by providing a bracket for a handle comprising a mounting plate and a cover plate, said mounting plate having a top surface and dependent vertical walls projecting downwardly from said top surface, said vertical walls tapering outwardly from one end of said top surface, said cover plate including a top surface and dependent vertical walls, said vertical walls tapering outwardly at the same taper as said mounting plate, said mounting plate including at least one recess in each of said vertical walls, said cover plate including at least one inwardly projecting finger in each of said vertical walls, whereby said cover plate can be secured to said mounting plate by sliding the tapering walls of the cover plate along the tapering walls of said mounting plate until said fingers are engaged in said recesses.

Other objects and many of the attendant advantages of this invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings wherein:

FIG. 1 is an exploded perspective view of the bracket of this invention with a fragmentary view of a handle to be secured by said bracket;

FIG. 2 is a perspective view of one embodiment of a mounting plate of the bracket of this invention, taken from the bottom thereof;

FIG. 3 is a perspective View of the cover plate of the bracket of this invention taken from the bottom thereof;

FIG. 4 is a perspective view of a second embodiment of a mounting plate of the bracket of this invention, taken from the bottom thereof;

FIG. 5 is a perspective view of the mounting plate of FIG. 4, taken from the top thereof;

FIG. 6 is a perspective view of a third embodiment of a mounting plate of the bracket of this invention, taken from the bottom thereof;

FIG. 7 is a perspective view of the mounting plate of FIG. 6, taken from the top thereof;

FIG. -8 is a perspective view of a radio having the bracket of this invention securing a handle thereon;

FIG. 9 is a sectional view showing the securement of a handle by one embodiment of the bracket of this invention;

FIG. 10 is a sectional view showing the securement of a handle by a second embodiment of the bracket of this invention;

FIG. 11 is an exploded perspective view showing the method of securing the cover plate onto the mounting plate of the bracket of this invention;

FIG. 12 is a perspective view showing the method of securing the loop of a handle into one embodiment of the mounting plate of this invention;

FIG. 13 is a bottom plan view of the mounting plate shown in FIG. 12 with the handle loop and cover plate in place;

3 FIG. 14 is a sectional view taken along the line 14--14 of FIG. 13;

FIG. 15 is a sectional view taken along the line 15-15 of FIG. 13;

FIG. 16 is a sectional view taken along the line 16-16 of FIG. 14;

FIG. 17 is a perspective view of the first step in securing a handle loop in the mounting plate of this invention, by using a modified method of this invention;

FIG. 18 is a perspective view of the second step of the method shown in FIG. 17;

FIG. 19 is a bottom plan view of the mounting plate of FIGS. 17 and 18, with the handle loop and cover plate in place; and

FIG. 20 is a sectional view taken along the line 2020 of FIG. 19.

Referring now in greater detail to the various figures of the drawings wherein similar reference characters refer to similar parts, a bracket for a handle embodying the present invention is generally shown at in FIG. 1. Device 30 basically comprises a mounting plate 32 and a cover plate 34.

As seen in FIGS. 1 and 2, mounting plate 32 includes an upper surface 36 with a central recess 38. Four aligned holes 40 are formed in recess 38. A pair of flanges 42 project downwardly from top surface 36, thereby forming dependent vertical side walls. A flange 44 projects downwardly from the front edge of top surface 36, thereby forming a vertical front wall. Side walls 42 taper outwardly in going from front wall 44 rearwardly. In this embodiment, there is no rear wall.

Vertical walls 42 include forward recesses 46 which form an upper edge 48 and a rear edge 50. Additionally, U-shaped recesses 52 are formed in walls 42. Each recess 52 includes an upper edge, a rear edge and a forward edge. Recesses 46 are aligned and recesses 52 are also aligned.

Cover plate 34 includes a top surface 54 which in cludes a raised portion 56 for the purpose of ornamentation. A pair of side walls 58 project vertically downward from top surface 54. Additionally, a front wall 60 projects downwardly from top surface 54. The top surface, side walls and front walls are unitary. A pair of U-shaped cuts are made in the forward portions of side walls 58 and fingers 62 are formed from these cuts. As best seen in FIG. 3, fingers 62 project inwardly from the side walls 58 and toward the rear of cover plate 34. A second pair of opposed U-shaped cuts are made in the rear portion of side walls 58 and fingers 64 are formed therefrom. These fingers also project inwardly with respect to walls and toward the front wall of cover plate 34.

The mounting plate 32 is generally used with a handle of the type partially shown at 66 in FIG. 1. Handle 66 can be formed of an extruded plastic which includes a metal reinforcing strip 68 (FIG. 9) in the center thereof. An elongated slot 70 is formed in each end of the handle.

The use of the bracket of this invention is best seen in FIG. 9. By way of non-limiting example, the top surface of a radio is shown at 72 in FIG. 9. A pair of holes 74' is formed in this top surface. Thereafter, handle 66 is placed over the top surface with slot 70 aligned with holes 74. A pair of rivets 76 pass through a pair of holes 40 in mounting plate 32, through slot in handle 66, I

and through holes 74 in the radio casing. Thereafter the rivets are capped in place. The securement of the handle is completed by placing cover plate 34 over mounting plate 32. This process is best seen in FIG. 11. Thus with the mounting plate 32 in place, cover plate 34 is aligned with the 'mounting plate. Thereafter, cover plate 34 is telescoped onto mounting plate 32 by sliding it in the direction of arrow 78. The sliding is continued until the forward edges of fingers 62 abut edges 5! of recesses 46. At the same time, the opposed edges of fingers 64 will snap into recesses 52 and will contact the forward edges of said recesses. This can be accomplished because cover plate 34 is made of a resilient material, such as steel, and the fingers can be deflected by walls 42 during the sliding operation. Once the cover plate has been secured in place in this manner, it can no longer be inadvertently removed. Thus,

fingers

62 and 64 prevent any lateral shifting of the cover plate in view of the fact that their exposed edges contact the rearward and forward edges of the recesses, respectively. Additionally, the abutment of the top edges of

fingers

62 and 64 against the lower edges of

recesses

46 and 52 prevents any upward movement of the cover plate.

In FIG. 8, a radio 80 is shown having handle 66 secured in place. Where desired, the use of rivets 76 can be altered to the extent that only one rivet will pass through slot 70 in the handle with the other rivet passing through forwardmost hole 40. Thus, the handle can be pushed flat against the top surface 66 of the radio when not in use in view of the fact that it is freely movable to the extent of the edges of slot 70 abutting rivet 76.

Although the bracket has been shown as being particularly adapted for use on a radio, it is to be understood that it can be used for securing any handle to any item adapted to receive a handle, such as luggage, briefcases, or television sets. Additionally, although the extruded plastic handle having a metal reinforcing strip has been shown, the bracket of this invention is adapted for use with any handle known to the art.

The four aligned holes in mounting plate 32 are used in order to have the mounting plate adapted for replacement of an existing mounting plate. Thus, using the mounting plate of this invention it may be possible to align at least two of the four holes with pre-existing holes on an item on which the prior hardware has been removed and will be replaced by the bracket of this invention. Having the central recess 38 obviates the necessity of countersinking each of the individual holes 40. Thus, the recess is sufliciently deep as to maintain the tops of rivets 76 below the top surface 36, as seen in FIG. 9.

A modified embodiment of the mounting plate is generally shown at 82 in FIGS. 4 and 5. This embodiment is substantially identical to embodiment 32 with the exception that forward vertical wall 44 includes a pointed extension 84. The pointed extension 84 is adapted to replace one of the rivets 76 used in installing the bracket of this invention. Thus, as seen in FIG. 10, pointed extension 84 pierces the top surface 72 of the radio casing. Thus, only a single rivet 76 'is needed for maintaining the mounting bracket 82 in place. Mounting bracket 82 is particularly adapted as a substitute for pre-existinghard ware on an item. Thus, it is only necessary to align one hole with a hole in the item since only one rivet will be necessary. Additionally, mounting bracket 82 is particularly useful when the handle 66 is adapted to be raised and lowered by sliding along its slot 7 G.

A third embodiment of the mounting plate of this invention is generally shown at 86 in FIGS. 6 and 7. This embodiment is substantially identical to mounting bracket 32 with the exception that a rear extension 88 is provided. Rear extension 88 includes an arcuate upper surface 99, a vertical wall 92 and a horizontal wall 94 projecting inwardly from wall 92. The inner face of wall 92 is spaced from the plane of the rear edges 96 of walls 42 a distance equal to the thickness of a loop to be used on a handle having securing loops at either'end.

The use of mounting plate 88 is shown in FIG. 12. Thus, this mounting plate is used with a handle 98 hav ing a metallic loop 100 at each end. The loop 100 is freely slidable in a slot 102. The loop 100 is placed in mounting plate 88 bypositioning it perpendicularly to the bottom surface of the mounting plate. Thereafter, the

loop is slid angularly inwardly between wall 92 and rear edge 96 of the mounting plate. The loop is then'rotated in the direction of arrow 104, while still in its perpendicular orientation. By so doing, the loop will be positioned against the arcuate surface 90 and between wall 92 and rear edge 96. Thereafter, the loop is rotated downwardly until it lies in the same plane as the plane of mounting plate 88. This position is shown in FIGS, 13 and 14.

After the loop has been secured in place, the mounting plate 88 is secured to the top surface 196 of an article, such as a television set or radio. The securement is made through a pair of spaced rivets 198, in the manner described above. With the mounting plate in place, cover plate 34 is then slid in place in the manner shown in FIG. 11. In this connection, it should be noted that the cover plate 34 is adapted for use with each of the three embodiments of the mounting plate shown. In FIG. 16, the locking of one of the fingers 64 of the cover plate against the mounting plate 88 is shown. Thus, it is apparent that due to the angle of finger 64, once the trailing edge 116 of the finger is past recess 52 it will automatically drop into the recess. The sliding removal of the cover plate is prevented by the abutment of edge 114! of the finger 64 against the forward wall of the recess. Likewise, as seen in FIGS. 13 and 15, the cover plate 34 cannot be vertically removed in view of the fact that the

fingers

62 and 64 will abut the upper edge or" recesses 46 and 52, respectively. Therefore, once the cover plate has been placed in its intended position it will remain firmly secured in that position.

One of the features of this embodiment of the invention is the fact that loop 100 is sufiiciently secured as to prevent any rattling. However, it can be freely pivoted when it is desired to raise the device on which the handle is secured by lifting the handle. Thus, as seen in FIG. 13, mounting plate 88 is designed in such a manner that the plane of the rear edges 96 is spaced from vertical wall 92 a distance equal to the thickness of bridging portion 112 of loop 100. Thus, as best seen in FIGS. 13 and 14, there is no room for lateral movement of loop 160 when it is secured in place. It is for this reason that the intricate steps described with respect to FIG. 12 for securing the loop in place are necessary. It is possible to pivot the loop 100 from the position shown in FIG. 14 in view of the fact that the diagonal distance from the lower lefthand corner of the loop receiving area to the upper righthand corner of the loop receiving area is greater than the thickness of the loop received within the area, as is apparent from FIG. 14.

In FIGS. 17 to 20 there is shown a modified manner of securing a loop 114 of handle 116 in the mounting plate 88. In this connection, attention is called to the fact that recesses 52 leave upstanding tabs 118 on vertical walls 42. In this embodiment, the loop 114 is smaller in thickness than the distance between vertical wall 92 and the plane of rear edges 96. Thus the loop 114 is easily dropped in place between the wall and the rear edges without the manipulation described with respect to FIG. 12. After it has been dropped in place it is secured against inadvertent removal by bending tabs 113 downwardly as seen in FIG. 18.

In this embodiment, the tolerances required are substantially less and therefore the mounting plate 88 can be used with a loop of any thickness which is equal to or less than the distance between vertical wall 92 and rear edges 96. For this reason, one mounting plate is adapted to accommodate a wide variety of handle loops. As seen in FIG. 20, tabs 118 are bent in such a manner as to prevent the inadvertent removal of the loop 114 from the loop receiving area of the mounting plate. The mounting plate 88 and cover plate 34 are secured in place in the same manner as that described with respect to loop 190 and its associated handle 102.

Although the looped handle has been shown in connection with only one mounting plate, it is to be understood that in use a pair of mounting plates will be used for each handle. The manner of securing the other loop is identical to that used with the loop shown.

The mounting bracket combination of this invention is adapted to be used with any article known to the art on which handles are secured. Thus, television sets, radios, luggage, briefcases, and furniture are included within the broad definition of the articles on which the invention is used. Although a specific rectangular shaped loop has been shown, it is to be understood that the word loop refers to any ringed structure adapted to secure a handle in place. Thus, any structure which includes as an element a bridging section that can be received by the mounting plate would fall within the scope of the loop used with this invention. Examples of the loops are trapezoids and rings.

One of the features of this invention is the ease by which a handle secured in place by loops can be mounted. Thus, in the prior art, it was necessary to form the loop receiving area after the loop was placed adjacent one end of the mounting plate. Usually a difficult forming process was required in order to bend the securing means in place. In one embodiment of this invention, it is totally unnecessary to do any bending at all in order to secure the loop. In the other embodiment of this invention, it is an extremely simple matter to merely bend tabs 118 in place to secure the loop.

Obviously many modifications and variations of the present invention are possible in the light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.

What is claimed as the invention is:

1. A bracket for a handle comprising a mounting plate and a cover plate, said mounting plate having a top surface and dependent vertical side walls projecting downwardly from said top surface, said vertical side walls tapering outwardly from one end of said top surface, said cover plate including a top surface and dependent vertical side walls, said vertical side walls on said cover tapering outwardly at the same taper as those on said mounting plate, said mounting plate including at least one recess in each of said vertical side walls, said cover plate including at least one inwardly and angularly projecting finger in each of said vertical side walls, said fingers adapted to be urged adjacent said cover plate when in contact with the vertical side walls of said mounting plate so that said cover plate can be secured to said mounting plate by sliding the tapering walls of the cover plate along the tapering walls of said mounting plate until said fingers project into said recesses.

2. The bracket of claim 1 wherein said top surface of said mounting plate includes a recessed portion and at least one hole formed in said recessed portion.

3. The bracket of claim 2 wherein a plurality of aligned holes are formed in said recessed portion.

4. The bracket of claim 1 wherein said mounting plate includes a dependent wall at said one end of said top surface.

5. A bracket for a handle comprising a mounting plate and a cover plate, said mounting plate having a top surface and dependent vertical side walls projecting downwardly from said top surface, said vertical side walls tapering outwardly from one end of said top surface, said mounting plate including a dependent wall at said one end of said top surface, said dependent wall including a pointed extension at the bottom thereof, said pointed extension projecting below the plane of the bottom edges of said vertical side walls, said cover plate including a top surface, and dependent vertical side walls, said vertical side walls on said cover tapering outwardly at the same taper as those on said mounting plate, said mounting plate including at least one recess in each of said vertical side walls, said cover plate including at least one projecting finger in each of said vertical side walls, whereby said cover plate can be secured to said mounting plate by sliding the tapering walls of the cover plate along the tapering walls of said mounting plate until said fingers are engaged in said recesses.

6. A bracket for a handle comprising a mounting plate and a cover plate, said mounting plate having a top surface and dependent vertical side walls projecting downwardly from said top surface, said vertical side walls tapering outwardly from one end of said top surface, said cover plate including a top surface and dependent vertical side walls, said vertical side walls on said cover tapering outwardly at the same taper as those on said mounting plate, said mounting plate including at least one recess in each of saidvertical side walls, said cover plate including at least one inwardly projecting finger in each of said Vertical side walls, said bracket further including a loop receiving portion at the end of said mounting plate opposite said one end, said loop receiving portion including an upper wall projecting outwardly from said top surface and a dependent portion projecting downwardly from said upper wall, whereby said cover plate can be secured to said mounting plate by sliding the tapering walls of the cover plate along the tapering walls of said mounting plate until said fingers are engaged in said recesses.

7. A bracket for a handle comprising a mounting plate and a cover plate, said mounting plate having a top surface and dependent vertical side walls projecting downwardly from said top surface, said vertical side walls tapering outwardly from one end of said top surface, said cover plate including a top surface and dependent vertical side walls, said vertical side walls on said cover tapering outwardly at the same taper as those on said mounting plate, said mounting plate includes a pair of recesses in each of said vertical side walls, said cover plate including a pair of inwardly projecting fingers in each of said vertical side walls, each vertical side wall of said cover plate including a forward finger and a rearward finger, with the forward fingers having an edge that projects towards the rear of said cover plate and the rearward fingers having an edge which projects towards the front of said cover plate, whereby said cover plate can be secured to said mounting plate by sliding the tapering walls of the cover plate along the tapering walls of said mounting plate until said fingers are engaged in said recesses, said fingers preventing any substantial lateral movement of said cover plate relative to said mounting plate by abutment of said edges against the Walls of said recesses.

-8. The bracket of claim 6 wherein said dependent vertical side walls include a pair of rear edges lying in a vertical plane and said dependent portion is spaced from said plane a distance equal to the thickness of the loop which is to be received in said loop receiving portion.

9. The bracket of claim 6 wherein said recesses in said dependent vertical side walls leave a pair of tabs adjacent the rear ends of said vertical side walls, said tabs adapted to be bent inwardly toward each other to secure a loop between said tabs and said dependent portion.

10. The bracket of claim 6 and further including a horizontal flange projecting toward said dependent vertical side walls from said dependent portion.

11. The bracket of claim 1 wherein each of said vertical side walls in said mounting plate includes a pair of recesses and each of said vertical side walls in said cover plate includes a pair of inwardly projecting fingers, said fingers adapted to be received in said recesses.

12. The bracket of claim 11 wherein said fingers include upper edges and said upper edges will abut the upper edges of said recesses whereby said cover plate can not be vertically removed from said mounting plate after said cover plate is in place.

13. In combination, a handle having at least one loop on one end thereof and a bracket for securing said handle to an article, said bracket comprising a mounting plate and a cover plate, said mounting plate including a top surface and a pair of dependent vertical side walls, said vertical walls having a pair of aligned edges, a loop receiving portion extending'from said top surface which said loop receiving portion being spaced from a plane extending through said aligned edges of said vertical walls and said loop has a thickness which is equal to the distance between said wall of said loop receiving portion and said plane through said edges.

16. A method of securing a loop of a handle in a mounting plate for securing said handle to an article comprising providing a mounting plate having a top surface and a pair of dependent vertical side walls projecting downwardly from said top surface, a loop receiving portion projecting outwardly from said top surface, said loop receiving portion including a dependent vertical portion, said vertical side walls including rear edges lying in. a plane, said vertical portion being spaced from said plane a distance equal to the thickness of said loop, positioning said loop perpendicularly to said top surface, rotating said loop while in said perpendicular orientation until said loop abuts said dependent vertical portion, and rotating said loop until said loop lies in the same plane as said top surface and one edge of said loop abuts said edges and the opposed edge of said loop abuts said vertical portion.

References Cited UNITED STATES PATENTS 3,113,650 10/1963 Szabo 58 FOREIGN PATENTS 1,229,247 3/ 1960 France.

JOSEPH R. LECLAIR, Primary Examiner.

FRANKLIN T. GARRETT, Examiner.

Claims

1. A BRACKET FOR A HANDLE COMPRISING A MOUNTING PLATE AND A COVER PLATE, SAID MOUNTING PLATE HAVING A TOP SURFACE AND DEPENDENT VERTICAL SIDE WALLS PROJECTING DOWNWARDLY FROM SAID TOP SURFACE, SAID VERTICAL SIDE WALLS TAPERING OUTWARDLY FROM ONE END OF SAID TOP SURFACE, SAID COVER PLATE INCLUDING A TOP SURFACE AND DEPENDENT VERTICAL SIDE WALLS, SAID VERTICAL SIDE WALLS ON SAID COVER TAPERING OUTWARDLY AT THE SAME TAPER AS THOSE ON SAID MOUNTING PLATE, SAID MOUNTING PLATE INCLUDING AT LEAST ONE RECESS IN EACH OF SAID VERTICAL SIDE WALLS, SAID COVER PLATE INCLUDING AT LEAST ONE INWARDLY AND ANGULARLY PROJECTING FINGER IN EACH OF SAID VERTICAL SIDE WALLS, SAID FINGERS ADAPTED TO BE URGED ADJACENT SAID OVER PLATE WHEN IN CONTACT WITH THE VERTICAL SIDE WALLS OF SAID MOUNTING PLATE SO THAT SAID COVER PLATE CAN BE SECURED TO SAID MOUNTING PLATE BY SLIDING THE TAPERING WALLS OF THE COVER PLATE ALONG THE TAPERING WALLS OF SAID MOUNTING PLATE UNTIL SAID FINGERS PROJECT INTO SAID RECESSES.