US3260560A - Lock for rotating shelf - Google Patents

Description

y 12, 1966 o. HOFSTETTER 3,260,560

LOCK FOR ROTATING SHELF Filed June 28, 1965 4 Sheets-Sheet 1 INVENTOR. 2 ORRIE L. HOFSTETTER y 12, 1966 0.1... HOFSTETTER 3,

LOCK FOR ROTATING SHELF Filed June 28, 1965 4 Sheets-Sheet :5

INVENTOR. ORRiE L. HOFSTETTER I y 12, 1966 o. L. HOFSTEZTTER 3,260,560

LOOK FOR ROTATING SHELF Filed June 28, 1965 4 Sheets-Sheet 4 244\ 250 200 2?) rj'f;:

FIG. 6

INVENTOR.

ORRIE L. HOFSTETTER United States Patent 3,260,560 LOCK FOR ROTATING SHELF Orrie L. Hofstetter, 1620 6th Ave., Kearney, Nebr. Filed June 23, 1965, Ser. No. 467,489 9 Claims. (Cl. 3l2238) This invention relates to locks for rotating shelves and more particularly it is an object of this invention to provide a locking assembly for a rotating shelf which is adapted to be more quickly, easily, and efficiently used than locks heretorfore used for this purpose.

In the prior art, rotating shelves have had catches of the type having a hall urged by a spring and entering a recess of a recess member whereby when a door of a shelf is in a closed position, a ball of such a latching assembly will engage in a recess member in a door, or vice versa. Such a catch assembly will hold a door in closed position so long as it is not urged toward open position, which can sometimes accidentally happen when a child leans upon a door. Small children playing with the contents of kitchen helves are a nuisance. Another disadvantage has been in the time consumed to carefully rotate a shelf into a position cfor engagement of such a spring latch assembly.

It is, therefore, an object of this invention to provide a locking assembly for a rotating shelf which makes it possible to rotate the shelf into door-closing position by simply giving it a push. The push will cause the shelf to swing by momentum until the latching assembly autornatically stops further turning of the shelf at precisely the point at which the doors are in closed position.

Still another object of the invention is to provide a locking assembly as described which will hold the doors Olf a rotating shelf in closed position against any unauthorized pushing there/against by childen or accidental bumping by anyone.

Still another object of the invention is to provide a rotating shelf which has control members which can be depressed for unlocking the locking means, whereby this is the only motion by which the door can be unlocked.

A further object of the invention is to provide a lock ing assembly having control means in the form of knobs [for providing the possibility of a more attractive appearance than would be possible if clumsier and larger control means need be used.

Other and cfurther objects and advantages of the present invention will be apparent from the following detailed description, drawings and claims, the scope of the inven- .tion not being limited to the drawings themselves as the drawings are only for the purpose 'Olf illustrating a way in which the principles of this invention can be applied.

Other embodiments of the invention utilizing the same or equivalent principles may be used and structural changes may he made as desired by those skilled in the art without departing cfrom the present invention and the purview of the appended claims.

In the drawings:

FIGURE 1 is a top plan view of a corner counter assembly shown with a rotating shelf of this invention mounted therein as seen in dotted lines.

FIGURE '2 is a sectional view taken along the line 22 of FIGURE 1.

FIGURE 3 is a sectional view taken along the line 33 of FIGURE 2 and looking upward at the underside of an upper shelf.

FIGURE 4 is an enlarged detail of the upper righthand corner portion of FIGURE 3 and showing one of the locking units in full lines in a locked position and in dotted lines in an unlocked position.

FIGURE 5 is a sectional view taken along the line 5-5 of FIGURE 4.

Patented July 12, 1966 FIGURE 6 is a detail of the latchengaging portion of a locking unit taken from the right-hand side Oif F-IG- URE 3.

FIGURE 7 is a detail of the latch portion of the locking unit taken from the right-hand side in FIGURE 3 and showing the latch in a locking position in full lines and in an unlocked position in dotted lines.

FIGURE '8 is .a detail of a modification of latching and latch release bell crank mechanisms shown in FIG- U'RE 4.

FIGURE 9 .is a detail showing a companion latching and latch release -bell crank mechanism to the corresponding mechanism of the modification shown in FIGURE 8. The view shows the mechanism incompletely and out of position for convenience of illustration.

FIGURE 10 is a bottom plan view of a modification of the latching assembly and bell crank mechanism portion of an unlatching assembly, the view being similar to a portion of the assembly of \FIGURE 4.

A corner counter section generally indicated at 10 of a kitchen counter is generally of the shape of a rectangle but with a portion thereorf removed as generally indicated at 12 for providing the counter 10 with two outer or forward edges 14 and 20 which latter are conventionally edged with molding 22, as best seen in FIGURE 2.

As best seen in FIGURE '3, a shelf assembly is there generally indicated at 30 and is of a type generally called a lazy susan shelf assembly conventionally having a center post 34 and plurality of shelves 66, '38, and 40, mounted one above another and fixed to and rotating with the post 34.

The post 34 is conventionally suitably mounted'in bearings 40 mounted on a bottom covering member 42 or a top covering member or counter member 44, the members 42 and 44 :being suitably referred to, iif desircd, as [frame portions of the corner counter assembly .10.

The counter assembly 10 further has door jamb means 60 and 62 disposed along the upper and lower sides of a pair of doors A and B, and end members 66 which also serve as door jamb means along the sides of the doors A and B, the members 66 being otherwise suitably secured to a frame of the lazy susan counter assembly, such frame being generally indicated at and having as its parts the earlier described members 42 and 4-4, the members 66 at the sides, a back member 84, best seen in FIGURE 3, and undersupport members 88, seen in FIGURE 2.

The doors A and B meet each other at 86 in a corner and the doors A and B are each suitably attached to the shelves 36, 38, and 40 .for rotating therewith and with the post 34.

All of the above described parts are conventional to a conventional lazy susan type rotating shelf corner counter assembly and so .the numeral herein will generally indicate such an assembly represented by all the above described parts.

In accordance with this invention, a pair of locking assemblies generally indicated at C and D are mounted on the left and right sides, respectively, of the assembly 100, although these will seem to be on the right and left hand sides in FIGURE 3, but they are actually correctly labeled because FIGURE 3 is a view of the upper shelf 40, as seen from the underside.

The locking assemblies C and D are substantially identical in their construction with the exception that they are symmetrical with one another about a reference plane extending vertically through the post 34 and bisecting the space between the doors A and B, as seen from the upper side, such reference plane being indicated at in FIGURE 3.

Because of this similarity between the two locking 3 assemblies C and D, only the locking assembly D will be described in detail. However, the locking assembly C, when its parts are referred to, will have its parts designated with the same numbers as the locking assembly D but with the corresponding numerals bearing a prime mark thereafter.

Referring now to FIGURE 3, a control portion of the lock assembly D is there generally indicated at 150 and is shown in greater detail in FIGURES 4 and 5.

As best seen in FIGURE 5, the control portion 156 has a knob 160 attached to a threaded shaft 162 having on it a nut 164 at its inner end disposed on an inner side of a lever 166 which latter has an opening 168 through which the shaft 162 can freely move, the shaft 162 extending through an opening 179 in the door B, the opening 170 being large enough to permit the knob 166 to be depressed into a dotted line position shown in FIGURE 5, the opening 170 permitting the shaft 162 to extend downwardly into a dotted line position shown in FIG- URE 5, for causing the lever 166 to swing into a dotted line position shown in FIGURE as is accomplished because the lever 166 is mounted on a rivet 171 for pivoting about a horizontal axis through the rivet 171, the rivet 171 being attached by a bracket 172 to the inner side of the door B.

The lower end of the lever 166 has a rod 180 extending into an opening 182 therein, the opening 182 extending at a right angle to the axis of the rivet 171, and a nut 1 84 is mounted on the rod 180 and in engagement with the inner side of the lever 166 so that when the lower end of the lever 166 swings in the direction of an arrow 190, the rod 180 will likewise move inwardly in the direction of the arrow 190.

As best seen in FIGURE 5, the upper shelf 40 has a notch 194 therein through which the lever 166 protrudes in order to :allow the lever 166 a freedom of swinging inasmuch as its lower end is disposed below the shelf 40. As best seen in FIGURE 3 and also in FIGURE 4, the rod 180 extends generally inwardly away from the door B at an angle which is generally approximately 45 degrees and inclining toward the left as the door B is faced as it is shown in FIGURE 1 in upright position.

The rod 180 can be set to extend away from the inner side of the door B and toward the post 34 end of the door B at approximately an angle of 45 degrees with respect to the door B.

The inner end of the rod D is received in an arm 188 of a bell crank assembly 190 and the arm 188 will be seen to be disposed at approximately a right angle to the general disposition of the rod D. The bell crank 190 rotates about a vertical axis along a pivot bolt 192 which latter is mounted on a latch-engaging portion bracket 194, which latter is mounted on the underside of the shelf 40.

The bell crank assembly 190 has another arm 1%, which latter is disposed at a right angle to the arm 188.

A latch plunger 200 extends slidably through an opening 202 in the arm 196, the latch plunger 200 extending at a right angle to the arm 196 and approximately along a radius extending from the post 34. The plunger 200 has a shoulder 210 fixed to it on that side thereof which is opposite the post 34 and a. spring 214 of a compression type extends around the plunger 200 on what shall be called the inner side of the arm 196, which is the side opposite the post 34. The spring 260 extends slidably through a spring anchor wall 220 which is fixed to the bracket 194 in a position inwardly of the edge 230 of the sheft 40 so that the spring 214 tends to urge the arm 196 into the full line position shown in FIGURE 4. However, it will be seen that the plunger 200 extends slidably through an opening 244 in the wall 220 whereby the plunger 200 can move slidably therethrough from a latch-releasing position shown in full lines in FIGURE 6 to a latch-unlocking position shown in dotted lines in FIGURE 6.

Now, a latch assembly of this invention will be described and it is generally shown at 250 in FIGURES 4 and 7 and has a curved latch 252 which is of approxirnately the same curvature as the circular outer edge 239 of the shelf 40.

The latch 252 has a free end 256 in a position engageable by the plunger 2% and has a rotatably mounted end 270 through which a vertical pivot bolt 272 extends and a spring 278 has one end attached at 280 to the rearward side of the latch 256, the other end of the spring being anchored at 282 to a latch bracket 288 which is fixed by suitable means such as a bolt 296 to a corner member 300, best seen in FIGURES 3 and 4, which latter is fixed to the earlier described frame 80 of the corner counter assembly.

The spring 278 is a tension spring urging the latch 252 rearwardly into the dotted line position shown in FIGURE 7. Excessive forward movement of the latch 252 is prevented by a latch control member 310, which latter extends from the rearward side of the latch 252 and has a hook portion 312 which is adapted to engage a stop 314, which latter extends downwardly from the latch bracket 283 and is disposed in a position for limiting forward movement of the latch 252 so that it cannot move forwardly of the full line position shown in FIG- URE 7.

The expansion and contraction of the tension spring 27 8 is indicated by a line with double arrows 320.

A magnet 322 is provided and is mounted on the shelf 49 by a magnet-mounting bracket 324, best seen in FIGURE 4. The magnet 322 has an arcuate outer surface 326 which latter is disposed in parallelism and in engagement with the forward side of the latch 252 at such time as the latch 252 is in a position for engaging a catch 40%. The catch 4% is fixed to the latch engaging portion bracket 194.

In operation, to open the rotating shelf, an operator need only pull outwardly on either of the knobs or 16%). Assuming the operator has pulled outwardly on the knob 160 of the door B, then as best seen in FIG- URE 3, the control portion 150 of the door B is operated for causing the rod to move from the full line position of FIGURE 4 inwardly away from the door B and into the dotted line position of FIGURE 4 thereby causing the arm 188 to move from the full line to the dotted line position. Thiswill cause the arm 196 of the bell crank asesmbly to move the latch plunger 2% into the dotted line position of FIGURE 4 for pressing against the latch 252 and pushing it into the unlatched or dotted ine position in FIGURE 4 wherein it is out of engagement with and out of the path of movement of the stop member 400, whereby a further pulling on the knob 160 will cause the shelf 40, as seen in FIGURE 4, to rotate in the direction of the arrow 420.

Referring now to FIGURE 3, it will be seen that rotation in the direction of the arrow 420 can continue a full 360 degrees until such time as the magnet 322 has once more come into a position opposite the latch 252,

whereupon the magnet will attract the latch 252 pulling it against the urging of the light tension spring 278 so that the latch 252 moves into the full line or latched position of engagement with the stop 409, whereby further rotation of the shelf ceases, as is desirable because when the shelf is in this position, the door B is once more in a closed position, as is also the door A.

It will be seen that the stop member 400' of the locking assembly C will not engage the latch 252 of locking assembly D because the magnet 322' of the assembly C is disposed behind the respective stop 400' whereby as it attracts the latch 252 toward the post 34, the latch 252 will already be laying against the end of the stop 400, and in this position, there is no stopping nor latching involved, whereby the passage of the stop 400 past the latch 252 happens without interruption to the motion of the shelf.

A reverse operation occurs when the knob 160 is pulled, whereupon the shelf can rotate in a direction opposite to the arrow 420 of FIGURE 3 until such time as the stop 400' has traveled 360 degrees and has then engaged the respective latch 252' in a stopping or latching fashion.

When either of the doors A or B is open, it will be found that simply pushing on it will cause the shelf to rotate toward the door-closed position of FIGURE 3, whereupon the respective stop 400 or 400' will have engaged their respective latch 252 or 252' to cause a latching and a stopping of further rotation of the shelf 40.

Referring to FIGURE 8, a modification 250" of the latch assembly 250 of FIGURE 4 is shown in which the latch 252 of the modification is in most respects the same as the latch 252, although it can have an inwardly off-set end 254', as is optional.

The latch 'of FIGURE 8 has one of its ends pivotally mounted on a vertical pivot 272' and the latch 252 is urged inwardly by a compression spring 278 anchored by a suitable member 282 supported by a latch bracket 288'.

The latch 252 is prevented from excessive forward movement toward the shelf 40 by a latch control member 310, which latter extends from the rearward side of the latch 252' and has a hook portion 312 which is adapted to engage a stop 314', which latter extends downwardly from the latch bracket 288 and is disposed in a position for limiting forward movement of the latch 252 so that it cannot move forwardly of the full line position shown in FIGURE 8.

As the unlatching bell crank assembly of the modification of FIGURE 8 is similar in its corresponding parts to that of the modification of FIGURE 4, its parts are, therefore, given the same numerals, and it will be understood to be controlled through a rod 180 by a similar mechanism as in the modification of FIGURE 4.

In FIGURE 10, a further modification is shown in which the edge of a shelf 40 is shown at 500 and a catch 400 protrudes from a latch-engaging portion bracket which is given a numeral 194' because it is identical to the latch bracket of the modification of FIGURE 8.

The modification of FIGURE 10 has a latch release plunger 200 and has a rod 180 similar to the rod 180 of the modification of FIGURES 4 and 8 and controlled by the same type of mechanism, not shown in FIGURE 10. Between the plunger 200' and the rod 180 is a mechanism such as a bell crank assembly 190', which mechanism, including the assembly 190' is similar in its operation to the assembly 190 of FIGURE 4.

In FIGURE 10 a latch 552 is shown with its end portion visible but its remainder not illustrated because its remainder is similar to and controlled by the same mechanism as is used in the modification of FIG- URE 8, whereby the latch 552 is urged inwardly toward the outer edge 500 of the shelf 40 so that the catch 400 tends to become caught in a notch 580 in the adjacent end of the latch 552 and is held there until the plunger 200 is operated for pushing the latch 552 away.

The inner side 560 of the terminal end 590 of the latch 552 is tapered from its outermost end inwardly at an inclination with respect to a tangent to the outer edge 500 of the circular shelf 40 so that at times when the shelf 40 is rotated in the direction :of an arrow 600, the catch 400 moving toward the notch 580, the catch 400 will be received in the notch 580, and when the shelf 40 is rotating in a direction opposite the arrow 600'so that the catch 400 is approaching the notch 580, the inclined surface 560 will tend to strike the catch 400 guiding the latch 552 so that it moves outwardly in the direction of an arrow 650 temporarily and until the catch 400 has become opposite the notch 580 into which it then falls preventing further rotation of the shelf.

In the operation of the modification of FIGURE 10, only one knob is needed and only one of the catches 400 and latches 552 is employed.

In the operation of the modification of FIGURE 8, two such latches and latch release mechanisms can be employed, one replacing the locking assembly C of FIGURE 3, and the other replacing the locking assembly D of FIG- URE 3; the locking assembly of FIGURE 8 being identified as D and the locking assembly of FIGURE 9 being identified as C because they correspond to, and replace the locking assemblies D and C of the modification of FIG URE 3, although it will be understood that the locking assembly 0' of FIGURE 9 is somewhat out of place and angularly out of exact relationship with respect to the locking assembly D for convenience .of illustration so they can be positioned on the same page of the drawing.

With the locking assemblies D and C of FIGURES 8 and 9 both disposed on the same rotating shelf 40, it will be seen that their operation will be similar to the assemblies of the modification of FIGURE 3 with each latch releasable by manipulating a corresponding knob, although such knobs are not shown in the views of FIGURES 8 and 9.

Referring to FIGURE 8, it will be seen that on the back side of the catch 400, the back side being the side which is opposite the side having the plunger 200, there is an inclined surface 710' inclining from the outermost end of the catch 400 at a suitable acute angle to a radius of the circular shelf 40 in a direction inwardly of the shelf and the inclined surface also extending in a direction away from that side 714 of the catch 408 which is normally facing the latch 252' to which it is adjacent when the doors are closed.

The purpose of the inclined surface 710 is so that when the catch 400 has been caused to move in the direction of an arrow 720 of FIGURE 8, then when it strikes the other latch which in this case is the latch shown in FIGURE 9, then the inclined surface 710 will cause the latch of FIGURE 9 to be pressed outwardly away from the shelf 40, which has the effect of allowing the catch 400 to pass by the latch of FIGURE 9.

As thus described, this invention is believed to fulfill the objectives above set forth and to provide a rotating shelf and lock assembly which can be more quickly, easily, and efficiently used.

From the foregoing description, it is though to be obvious that a lock for rotating shelf constructed in accordance with my inventionis particularly well adapted for use, by reason of the convenience and facility with which it may be assembled and operated, and it will also be obvious that my invention can be changed and modified without departing from the principles and spirit thereof, and for this reason, I do not wish to be understood as limiting myself to the precise arrangement and formation of the several parts herein shown in carrying out my invention in practice, except as claimed.

I claim:

1. A rotating shelf and lock assembly comprising: a frame, a horizontal shelf, means mounting said horizontal shelf on said frame for rotation about a vertical axis, a door attached to and rotating with said shelf and disposed upright, said door having an inner side adjacent said shelf and having an outer side opposite said shelf, a control portion having a control member on the outer side of said door, a latch assembly comprising a latch, means mounting said la-tch into a position for latching, a catch, means mounting said catch on said shelf in a position for engaging said latch when said shelf has been rotated in one direction and has thereby caused said door to have reached a desired closed position, a latch-engaging assembly comprising a latch-engaging member, means movably mounting said lach-engaging member on said shelf, and interconnecting means operably interconnecting said control member and said latch engaging member and movably mounting said control member on said door, said interconnecting means operably correlating said control member and said latch-engaging member so that when said control member is in a first position, said latch-engaging member will not disturb said latch from its position of engagement with said catch and so that when said control member is moved toward a second position said latchengaging member will engage said latch urging it out of engagement with said catch, whereby when said control member has reached said second position said latch and catch will be out of said engagement whereby rotation of said shelf in said one direction is possible for urging said latch toward a latching position for engagement with said catch.

2. The combination of claim 1 in which said interconnecting means is provided with a spring operably correlated therewith and urging said latch-engaging member into a position for permitting said latch to engage said catch.

3. The combination of claim 1 in which said means operably correlating said control member and said latchengaging member comprises a plunger disposed approxi- :mately radially with respect to said axis, and further comprises a bell crank rotatable about an axis parallel to said first-mentioned axis, means so mounting said bell crank on said shelf, means operably interconnecting one end of said bell crank and said latch-engaging plunger so that when said bell crank is rotated in one direction, said latch-engaging plunger will be urged into a position for pressing said la-tch into a position of non-engagement with said catch.

4. The combination of claim 1 in further combination with a second door attached to said shelf and disposed at a right angle to said first door, said second door having an inner side facing said shelf and an outer side, a second control member disposed on the outer side of said second door, a second latch assembly, said second latch assembly being mounted on said frame similarly to said first latch assembly, a second catch mounted on said shelf, said second catch and the latch of said second latch assembly being mounted in positions for engagement so as to prevent said shelf from rotating in a direction opposite to said one direction and for permitting said shelf to rotate in said one direction, a latch-engaging assembly comprising a second latch-engaging member, and a second interconnection means, said second control member and said second latch-engaging member being operably correlated by said second interconnection means in a manner for operation with respect to said second latch similarly to the operation of said first control member and said first interconnection means with respect to said first latch, whereby when either of said control members are moved into a position for disengaging their respective latch and catch that respective control member can be pulled forwardly for rotating said shelf to gain access thereto and whereby when said control members are in positions for causing latching upon a suflicient pushing of either of said doors at a time when said doors are not in the described closed positions, said shelf will rotate until said doors reach closed positions whereupon a respective one of said latches will engage its respective catch for locking said shelf in a position for maintaining said doors closed.

5. The combination of claim 1 in which substantially all of said latch-engaging assembly and of said interconnecting means are disposed on the underside of said shelf, whereby they are not in a position to interfere with the free use of the upper side of said shelf for storage.

6. The combination of claim 1 in which substantially all of said latch-engaging assembly and of said interconnecting means are disposed on the underside of said shelf,- whereby they are not in a position to interfere with the free use of the upper side of said shelf for storage, and said control member being disposed in a position above and to the forward side of said shelf for ready accessibility.

7. The combination of claim 1 in which a magnet is mounted on said shelf in a position for attracting said latch toward a position of latching engagement with said catch.

8. The combination of claim 1 in which a magnet is mounted on said shelf in a position for attracting saidlatch, toward a position of latching engagement with said catch, said magnet being disposed closer to said door than said catch, whereby during a rotation of said shelf in said one direction, said magnet will attract said latch into position for engagement with said catch whereby whensaid catch has reached said latch a latching will occur stopping further rotation of said shelf.

9. The combination of claim 8 in further combination with a spring operably correlated with said latch-en'- gaging assembly for urging said latch into an unlatched position of non-engagement with said catch, said spring being overcomable by said magnet at times when said magnet is in a position opposite said spring.

References Cited by the Examiner CLAUDE A. LE ROY, Primary Examiner.

C. E. HARRIS, Assistant Examiner.

Claims (1)

1. A ROTATING SHELF AND LOCK ASSEMBLY COMPRISING: A FRAME, A HORIZONTAL SHELF, MEANS MOUNTING SAID HORIZONTAL SHELF ON SAID FRAME FOR ROTATION ABOUT A VERTICAL AXIS, A DOOR ATTACHED TO AND ROTATING WITH SAID SHELF AND DISPOSED UPRIGHT, SAID DOOR HAVING AN INNER SIDE ADJACENT SAID SHELF AND HAVING AN OUTER SIDE OPPOSITE SAID SHELF, A CONTROL PORTION HAVING A CONTROL MEMBER ON THE OUTER SIDE OF SAID DOOR, A LATCH ASSEMBLY COMPRISING A LATCH, MEANS MOUNTING SAID LATCH INTO A POSITION FOR LATCHING, A CATCH, MEANS MOUNTING SAID CATCH ON SAID SHELF IN A POSITION FOR ENGAGING SAID LATCH WHEN SAID SHELF HAS BEEN ROTATED IN ONE DIRECTION AND HAS THEREBY CAUSED SAID DOOR TO HAVE REACHED A DESIRED CLOSED POSITION, A LATCH-ENGAGING ASSEMBLY COMPRISING A LATCH-ENGAGING MEMBER, MEANS MOVABLY MOUNTING SAID LATCH-ENGAGING MEMBER ON SAID SHELF AND INTERCONNECTING MEANS OPERABLY INTERCONNECTING SAID CONTROL MEMBER AND SAID LATCH-ENGAGING MEMBER AND MOVABLY MOUNTING SAID CONTROL MEMBER ON SAID DOOR, SAID INTERCONNECTING MEANS OPERABLY CORRELATING SAID CONTROL MEMBER AND SAIX LATCH-ENGAGING MEMBER SO THAT WHEN SAID CONTROL MEMBER IS IN A FIRST POSITION, SAID LATCH-ENGAGING MEMBER WILL NOT DISTURB SAID LATCH FROM ITS POSITION OF ENGAGEMENT WITH SAID CATCH AND SO THAT WHEN SAID CONTROL MEMBER IS MOVED TOWARD A SECOND POSITION SAID LATCHENGAGING MEMBER WILL ENGAGE SAID LATCH URGING IT OUT OF ENGAGEMENT WITH SAID CATCH, WHEREBY WHEN SAID CONTROL MEMBER HAS REACHED SAID SECOND POSITION SAID LATCH AND CATCH WILL BE OUT OF SAID ENGAGEMENT WHEREBY ROTATION OF SAID SHELF IN SAID ONE DIRECTION IS POSSIBLE FOR URGING SAID LATCH TOWARD A LATCHING POSITION FOR ENGAGEMENT WITH SAID CATCH.

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