US3023434A - Binding machine - Google Patents

Description

March 6, 1962 E. w. Fox

BINDING MACHINE 2 Sheets-Sheet 1 Filed Dec. 6, 1957 INvEN-ron EDWARD W. F'ox ATTY.

March 6, 1962 E. w. Fox 3,023,434

BINDING MACHINE Filed DeG. 6, 1957 2 Sheets-Sheet 2 59.4

'Hlll 3,023,434 Patented Mar. 6, 1962 3,023,434 BING MACHINE Edward W. Fox, Round Lake Beach, lil., assignor to Plastic Binding Corporation, Chicago, Ill., a corporation of Delaware Filed Dec. 6, 1957, Ser. No. 701,001 7 Claims. (Cl. 11-1) This invention relates to binding machines, and more particularly to a binding machine for inserting a resilient tubular binder, having spaced apart elastic, deformable lingers, through aligned perforations in a stack of sheets to be bound, or for removing such a binder from a stack of sheets secured thereby.

The present invention constitutes an improvement in the art of binding machines, such as, those fully disclosed and claimed in the following patents to Nelson et al., each of said patents being assigned to the present assignee: Patent No. 2,108,136 issued on February 15, 1938 and Patent No. 2,334,433, issued on November 16, 1943.

The binder comprises a continuous arcuate shaped back portion having a plurality of aligned spaced resilient fingers, each having one of its ends attached to the back member and being longitudinally curled in tubular form so that its free end lies along either the inner or outer surface of the arcuate shaped back portion. The binder may be made of material having an appropriate elasticity, such as for example, Celluloid or pyroXylin. A binder of the type described is fully shown and claimed in the United States Patent No. 1,970,285, issued August 14, 1934, and United States Patent No. 2,224,165, issueii December 10, 1940, to which reference may be had for details of its construction.

While the binding machines illustrated in the prior art have proven successful and are widely employed in commerce, a need has arisen for a more portable binding machine. The operation of the prior art machine has been controlled by a foot treadle which can be kept depressed to hold the fingers of the binder in their spread condition while the operators hands are free to assemble the perforated sheets and align the perforations prior yto the insertion of the fingers of the binder. In a portable machine a means must be provided to hold the fingers in their spread condition since a depending foot treadle is not practicable. The holding means must be positive and reliable in action and must be easily released by the operator while he holds the perforated sheets in their proper position.

It is therefore an object of the present invention to provide a binding machine which is portable, compact and which contains a minimum number of parts for easy and economical assembly.

It is a further object of the present invention to provide a binding machine which is simple in construction so that it may be operated by those relatively unskilled in the binding art with a minimum amount of instruction.

It is yet a further object of thepresent invention to provide a binding machine which may be easily adapted for use with binders of different diameters, which can be locked in any selected position while the perforated sheets are being aligned and placed in position and which can be easily released from its locked condition.

The preferred embodiment of the present invention includes a base member for supporting the binding mechanism in a convenient, stable position upon the surface of a work table or counter. The base member has a plurality of spaced apart upstanding fingers or retaining pins for engaging the arcuate back member of the binder between the normally curled fingers. The base provides a pivotal mounting means for a table or support which may be rotated toward and away from the upstanding fingers through a predetermined angular distance. The rear edge of the table has mounted thereon a plurality of metal loops or rings which enter the binder between adjacent curled fingers thereof when the table is in its normal horizontal position. A rod or wire is pushed axially through the alternate rings of the table and along the interior surfaces of the curled binder fingers. Rotation of the table top about its pivot causes the binder fingers to uncurl as the wire which was inserted inside the curled fingers is moved outwardly and away from the back member of the binder which is held in place by the upstanding fingers supported by 4the base member.

In accordance with the preferred embodiment of the present invention, a locking mechanism is actuated by the movement of the table as it moves away from the upstanding pins. The locking mechanism is made free to move a variable distance up to a presettable maximum amount as the table rotates in its finger uncurling operation. After the table has been depressed from the horizontal plane by an amount determined by the desired amount of uncurling of the binder fingers, the rotating force on the table is removed. This causes the table which is biased to return to its horizontal position to cause the locking mechanism to operate and secure the table in its depressed condition. While the fingers of the binder are being held rmly in their uncurled condition, the sheets to be bound are prepared by aligning their perforations and placing them in position to receive the fingers of the binders as they recurl. A release mechanism is operated and the locking mechanism is rendered inoperative so that the table moves back to its horizontal position and the fingers of the binder recurl and enter the perforations of the sheets. After the fingers have recurled upon themselves, the wire or rod is removed. The sheets are now bound together by the binder and may be removed from the binding machine.

The above and further objects, features and advantages will be recognized by those familiar with the art from the following detailed description of a preferred embodiment thereof, as illustrated in the accompanying drawings in the several figures of which like reference numerals indicate like elements, and in which:

FIGURE 1 is a top plan view of the binding machine of the present invention;

FIGURE 2 is a front elevational View thereof;

FIGURE 3 is a side elevational view thereof;

FIGURE 4 is a transverse cross sectional View of the machine taken along lines 4 4 of FIGURE 2 and shows the binding machine in its normal or unoperated condition;

FIGURE 5 is a transverse cross sectional view similar to FIGURE 4 but showing the binding machine in condition to receive a stack of perforated sheets to be bound thereby;

FIGURE 6 is a section taken substantially along the line 6 6 of FIGURE 2;

lFIGURE 7 is a fragmentary perspective of a corner of the top plate; and

FIGURE 8 is* a fragmentary perspective view of a corner of the back and side walls showing the holding fingers.

The binding machine ofthe present invention comprises a base, generally indicated at 10, which may, if desired, be formed of a single piece of sheet metal. Base 18 has a horizontal bottom plate 12 to which a plurality of foot pads or suction cups 13 are attached by any convenient means, such as adhesive, bolts or sheet metal screws, which serve to cushion the Ywork table from shocks and, at the same time, prevent slipping or sliding of the binding machine over the working surface during operation.

Two sidewalls 15 extend perpendicularly upward, from bottom plate 12 in parallel planes spaced from each other by the width of plate 12. Sidewalls 15 are integral with plate 12 at their lower edges and each is in the shape of a trapezoid having a downwardly sloping upper edge 16. The lower ends of inclined edges 16 terminate at the top of a short front wall 17 which extends upwardly from plate 12 between side walls 15 and is integrally connected thereto.

A back wall 18 closes base 10 at its end opposite that of front wall 17 and is integral with bottom plate 12 along its lower edge and extends to sidewalls 15 at each of its sides. Back wall 18 at its upper edge, which terminates at its point of juncture with the upper ends of inclined edges 16 of sidewalls 15, has a rearwardly extending horizontal shelf 19 parallel to base 1'2 formed by bending a portion of back wall 18 away from the interior of base 10. Shelf 19 serves to mount a device which limits the rotational movement of the table in a manner described in greater detail hereinafter. Back wall 18 has a round aperture 20 located centrally between sidewalls 16 and near its upper edge to provide an opening through which passes a part of a locking mechanism described in detail hereinafter.

A plate 24 which extends along the upper portion of backwall 18 across the entire length thereof is secured thereto by suitable means, such as, welding or mechanical fasteners. Plate 24 supports integrally mounted, upwardly extending aligned fingers or retaining pins 25 which are spaced at equal intervals along the upper edge of plate 24. Fingers 25 extend upwardly beyond the connes of base l at the rear upper edge thereof, and for ease of understanding, the structure of plate 24 and lingers 25 may be considered similar to that of a comb. f

If desired the fingers may be separately mounted on back wall 18, but should project upwardly from base 10 in longitudinal alignment having equi-distant spaces between adjacent lingers. The fingers form a restraining or holding device for the back member of the binder during the uncurling of the binder fingers.

A table 30 of at sheet material, preferably sheet metal, is pivotally mounted for rotational movement away from and toward pins 25 secured to back wall 18 of base 10. Table 30 comprises a flat rectangular upper plate 3l1 and vertically depending sidewalls 32 integral therewith of trapezoidal shape whose inner surfaces are adjacent the outer surfaces of sidewalls 15 of base 10 and lie immediately outside thereof in overlapping spaced relation thereto. The front edge of table 30 terminates with a short depending wall 35 which extends downwardly to meet the upwardly inclined edges 36 of sidewalls 32.

The pivotal connection 40 for table Sti` about which it rotates in a controlled arc are located in axial alignment through sidewalls 15 and 32 at either side of base 10 and near the lowermost end of inclined edges 36 at the rear of the table. It should be noted that the rear edge 41 of plate 31 and the trailing edges 42 of depending sidewalls 312 fall just short of rear wall 118 of base 10 so as to provide clearance therewith. Pivotal connections 4h may be a continuous rod for both connections or separate pins or the like, or any suitable mechanical means which provides for pivotal movement at these points.

A bracing or strengthening member 44 of sheet metal forming a rectangular parallelogram with top member 31 is secured to the under surface thereof, and extends thereacross between depending` sidewalls 32. Bracing member 44 comprises a flat, short flange 45' secured to the undersurface of plate 31 by welding or other suitable means and extending toward but short of the front wall 35 of table 30. A depending tlange 47, perpendicular to flange 45, is integral therewith and with a relatively long at plate section 49 which runs parallel to top member 31 of table 30. A flange 51 parallel to flange 4-7 and disposed toward the rear of table 30 connects plate 49 with another flange 52 secured to the underside of top member 311.

A mounting plate 55 extending the entire length of rear edge 41 of table 3%) is secured to the under surface of top member 31, abuts the free edge of flange 52 and extends rearwardly to the edge 41. The plate 5S has formed at the rear thereof integral metal loops or rings 58 which may be made by curling back upon themselves short narrow fingers protruding from the rear edge of bar 55. These loops or rings 58 are spaced equidistantly, longitudinally of bar 55 and are situated so that when table 30 is in its normal or horizontal position they abut respectively corresponding ones of upstanding fingers 25. For convenience, there are about one-half as many rings 58 as there are fingers 25. The diameter of each of loops 58 is sufficiently large to receive a pointed wire or rod 59 which may be manually inserted through them. Wire 59 has a pointed end 60 to facilitate its insertion through loops and a finger loop 61 to aid in its withdrawal.

A spring member 65 centrally located between sidewalls 32 of table 30 of flat tempered steel stock is used to bias the table to its horizontal position, with loops 58 abutting their associated fingers 25. Spring member 65 is relatively narrow and comprises a general at portion 66 which is held against the upper surface of bottom plate 12 by a clamp 67. To simplify construction of the binding machine, clamp 67 may be struck or punched upwardly from bottom plate 12 in the form of a rectangle with its sidewalls still integral therewith and a channel formed by cutting away its forward and rear walls. The fiat portion 66 of spring 65 is slipped between clamp 67 and plate 12. A snubbing block 68 for further restricting movement of spring 65 is struck upwardly from plate 12 and holds the upturned end 69 of spring 65 from further frontal movement.

Spring 65 has a bight portion 70 and a section 71 extending generally parallel to portion 66 toward the front of table 30. About midway along the length of portion '71, the spring is bent at an obtuse angle upwardly with its upper end extending adjacent to the underside of plate 31. The upper surface of spring section 71 abuts the junction of ilanges 47 and 49 and bears against this junction to bias table 341 toward its horizontal position. The exact shape and dimensions of the spring member are not essential features of the invention so long as suflicient force is generated thereby to hold table 30 in a horizontal position and that the force required to rotate table 30 clockwise away from rear wall 18 of base 10 is not excessive.

The construction of the base and table members of the binding machine have been hereinbefore described `and attention is now directed toward the locking feature of the present invention. A metal ring 75, shown in cross section in FIGURES 4 and 5 is secured to the outside surface of rear Wall 18 of base 10 concentrically with aperture 20 thereof by suitable means, such as bolts 76. The outer surface of ring 75 is cylindrical while its inner surface 77 is frusto-conical, having its largest diameter nearest wall 18 and its narrowest diameter at its free end away from back wall 18. The inner surface of ring 75, because of its constantly narrowing diameter as it recedes from 'back wall 18, serves as a wedge to Vform a locking means to hold table 30 in any operated condition in a manner more fully described hereinafter. The end of ring 75 farthest from wall 18, has a circular recessed area 80 adapted to receive oneend of a helical spring 81.

There is provided a locking plug and guide means: 84 which has a cylindrical elongated shank 85 `of an outside diameter slightly smaller than the smallest inside diameter of ring 75. The plug has a longitudinal bore 86 and Ian annular ange 87 integral therewith to form a retaining surface for the helical spring 81.

Plug 84 has cut therein a pair of recesses 9i) and 91 located on diametrically opposed sides of the bore 86, and intersecting that bore. The diameter of each of the recesses 90 and 91 is greater than the thickness of shank 85. Plug 84 is inserted into ring 75 far enough so that recesses 90 and 91 are enveloped thereby.

Balls 95 and 96, which may be steel ball bearings, are placed in respective ones of recesses 99, 91. The diameter of each ball is greater than the thickness of shank 85 but slightly smaller than the diameter of its associated one of the recesses 9i) or 91 so that it is free to rotate and move up and down therein. Furthermore, the diameter of each ball is of such length that when plug 84 is moved away from back wall 1S, the sloping inner surface of ring 75 causes each ball to protrude into bore 86 of plug 84. When plug 84 is moved toward back wall 18, the balls are free to move out of engagement with the inner surface of ring 75 and are then clear of the bore 86.

A bolt or stud 100 extends through the bore 86 of the plug S4 and is movable longitudinally therein. The ring 75, spring 81, plugger guide means 34 and balls 95 and 96 form a locking mechanism for releasably holding the stud or bolt 100 in any desired position and thereby hold the table 30 in any desired position. For this purpose the stud 100 is pivotally mounted as at 101 to the under side of the table 30 as by means of a U-shaped bracket 102 that is fixed to the underside of the table 30, centrally between the right and left hand ends thereof and adjacent to the rear thereof. The U-shaped bracket 102 has two outwardly turned flanges 104 at the top thereof to facilitate fastening the bracket by spot-Welding or otherwise, to the underside of the table.

In Order to adjustably limit the length of travel or turning of the rear edge 41 of the table away from the back wall 18 to spread the binder fingers only a predetermined limited amount, there is provided a stop device. This stop device comprises a bracket 120, the upper part 121 of which is secured as by welding to the underside of the shelf 19 and the lower arm 122 of which is secured at 125 to the back wall 18. The back 123 of the bracket has an elongated aperture 124 to which the stud 100 passes freely, the aperture being of a larger size than the stud so that the latter is free to tilt in the aperture as illustrated. A knurled nut 126 is threaded onto the part of stud 190 extending outwardly of bracket 120 and is adjustable to limit the longitudinal movement of stud 10i) as it is drawn inwardly of base 10 when table 30 is depressed for the purpose .heretofore discussed.

A release mechanism is provided to release the locking mechanism and comprises a metal, rigid push bar 130 of rectangular cross-section which extends horizontally and nearly parallel to the back wall 18 and transversely to the axis of stud 100. Push bar 130 has an end 131.' protruding outwardly of one of the sidewalls 15 of base 10 and a second end secured by a bolt 132 to back wall 1S at a point in the vertical plane of stud 109 and on the side of stud 100 opposite the free end of the push bar. Bar 130 has an oversize aperture 133 through which stud 100 passes and permits bar 13G to move along the longitudinal axis of the stud. A spiral spring 135 biases bar 130 away from back wall 18 and away from flange 87 of vplug 84. A squeeze bar 136 is attached to the rear wall 18, as by bolts 137 and nuts 137' adjacent but spaced forward of the end 131 of the bar 139. When the free end 131 of bar 130 is moved toward the 'back Wall 18 of base 10, it pivots about the head of bolt 132 and pushes plug 84 forward by engagement with ange 87 thereof for a purpose to be described hereinafter.

With reference to FIGURES 4 and 5 there is therein shown in section, a tubular binder, generally indicated at 139, having an arcuate backbone or spine 140 engaged by and held in place by upstanding lingers 25. Fingers 142 of the binder which are resiliently biased to curl in upon backbone 140 in their unspread condition are spaced at equal intervals along spine 140 and external transversely therefrom. These fingers are of a material having suicient flexibility to permit uncurling of the fingers so that a sheaf of perforated sheets as shown at 145 may be interposed between the tips of the lingers 142 and the spine 140 and suicient resiliency to cause them to recurl into their unspread condition overlapping the arcuate spine 14?. Such a binder is fully described and claimed in United States Patent No. 2,334,433.

In operation, the binder 139 is placed over the row of retaining pins 25 with the `edges of the arcuate spine 140 touching the back surfaces of the pins and having its linger engaging edge resting on plate or `shelf 19. Each of the retaining pins 25 extends upwardly between a pair of consecutive binder lingers 142. At the same time as the table 30 is in its horizontal or normal position (FIG. 4) loops 58 are disposed in the spaces between adjacent fingers 142.

With the binder in the position described, the wire 59 is pushed lengthwise through the loops 5S and along the inner surfaces of curled fingers 142. The table 30 is then moved clockwise in an arcuate path against the biasing force of spring 65. The wire 59 is pulled away from retaining pins 25 by the forward movement of loops 58 and serves to uncurl fingers 142 simultaneously and spread them so their tips are drawn away from the free edge of spine 140 leaving a gap therebetween. Rotational movement of the table 30 also pulls stud 100 longitudinally and downwardly, as shown in FIGURE 5, until limit stop nut 126 strikes bracket 120.

The Vtable 30 is held in its depressed position by means of the locking mechanism comprising ring 75, plug 84 and balls and 96. It will be seen that stud 100 is free to move in its forward direction because any binding force or frictional force attributable to the engagement of balls 95 and 96 with the shank of stud 100 and the frusto-conical inner surface 77 of ring 75 merely moves plug 84 toward back wall 18, so that the balls enter into an area where the diameter of the interior of the ring is suciently large to relieve any such binding force. On the other hand, if the table 30' rotates even a small amount in a counterclockwise direction under the urging of spring 65, stud moves longitudinally rearwardly. At this time, the biasing action of spring 81 urges plug 84 away from ring 75. Plug 84 is prevented from escaping from ring 75 only because in its rearward movement, balls 95 and 96 engage both studs 10i) land the narrowing frusto-conical inner surface of ring 75. As plug 84 and stud 100 move rearwardly, balls 95 and 96 are forced by the narrow contines of ring 75 to grip stud 100 with such force as to prevent its further rearward movement.

Since stud 100 is secured to table 30 through bracket 192, the table cannot rise any further. The lingers 142 are maintained in their spread condition so that the perforated sheets 145 maybe placed in position to receive them.

To release the locking mechanism, it is only necessary to move release bar forward at its free end to pivot it in an arc about bolt 132. As release bar 130 is moved toward the front of table 30, it engages `the rear of flange 87 of plug 84 and forces the plug toward back wall 18. As plug 84 is urged forwardly, it carries therewith balls 95 and 96 into the larger diameter portion of the frustoconical interior of ring 75. The binding force caused by the engagement of balls 95 and 96 between the inner surface of ring 75 and the shank of stud 100 is removed and the stud 100 is free to move rearwardly as leaf spring 65 urges table 30 counter-clockwise to its normal position.

As the table Si) moves to its normal position, the spreading force applied to resilient lingers 142 is -removed and these fingers recurl to their spine-engaging condition to reform the tubular shape of the binder. The iingers will now be engaging the perforations of the stack of sheets 145 to form a bound volume. There remains only the withdrawal of wire 59 from engagement with loops 58 and the assembled and 4bound stack of sheets may be removed from the binding machine. The binding machine of the present invention is now in condition for immediate reuse.

While what has been described is regarded as the preferred embodiment of the invention, it will be apparent that variations, rearrangements, modifications and changes may be made therein without departing from the scope of the present invention and such invention should be limited only by the scope of the appended claims.

I claim:

l. An apparatus for spreading an elastic binder having a longitudinal spine and a longitudinal row of aligned, spaced, curled fingers extending transversely thereof, said apparatus comprising means for confining movement of said spine, means movable away from and toward said spine confining means for uncurling said fingers simultaneously, locking means in opera-ble connection with said finger uncurling means for holding said uncurling means in any operated position, said locking means includ-ing a stud connected at one end thereof to said finger 'uncurling means, guide means surrounding said stud and said stud being movable through said guide means in one direction, stud gripping means on said guide means, said guide means being operable to urge said stud gripping means into gripping engagement with the stud upon initial movement of said stud in the opposite direction, and

-release mechanism adjacent to said guide means to shift the gripping means out of gripping engagement with the stud to permit the stud to move through said guide means in said opposite direction.

2. An apparatus for spreading an elastic binder having a longitudinal spine and a longitudinal row of aligned, spaced, curled fingers extending transversely thereof, said apparatus comprising a frame means for confining movement of said spine, means rockably mounted on said frame and movable arcuately away from and toward said spine confining means for uncurling said fingers simultaneously, locking means in operable connection with said finger uncurling means for holding said uncurling means in any operated position, said locking means including an elongated stud connected at one end thereof to said finger uncurling means, guide means forming a passage- Vway for said stud and said stud being movable through said guide means in one direction, stud gripping means fon said guide means, said guide means being operable tto urge said stud gripping means into -gripping engagement with lthe stud upon initial movement of said stud in the opposite direction, and release mechanism adjacent said guide means to shift the gripping means out of gripping engagement with the stud to permit the stud to move through said guide means in said opposite direction.

3. An apparatus for lspreading an elastic binder having a longitudinal spine and a longitudinal row of aligned,

spaced, curled fingers extending transversely thereof, said apparatus comprising means for confining movement of said spine, means for uncurling said fingers simultancously, locking means in operable connection with said liinger uncurling means for holding said uncurling means in any operated position, said locking means including a stud secured at one end thereof to said finger uncurling means and movable longitudinally therewith, guide means surrounding said stud at an intermediate portion thereof and said stud being movable in one direction through the guide means upon operation of the finger uncurling means, said guide means having stud gripping means contiguous with said stud, and wedge means surrounding said guide means and adapted to force said gripping means into engagement with said stud upon movement lof said stud, in the opposite direction, whereby said finger uncurling means is free to move in one direction but is locked in position upon its movement in a reverse direction.

4. An apparatus for spreading an elastic binder having a longitudinal spine and a longitudinal row of aligned, spaced, curled fingers extending transversely thereof, said apparatus comprising means for confining movement of said spine, means for uncurling said fingers simultaneously, locking means in operable connection with said finger uncurling means for holding said uncurling means in any operated position, said locking means including an articulated stud secured at one end to said finger uri'- curling means and movable longitudinally therewith, guide means surrounding said :stud at an intermediate portion thereof on the side of said articulation opposite that of said connection, said guide means having a pair of spherical channels therein extending through said guide means on opposite sides of said stud, a pair of spheres held in respective ones of said channels and contiguous with said stud, said spheres being of such diameter as lto extend outwardly of said guide means, a ring secured to said spine confining means and surrounding the channel portion of said guide means having a frusto-conical interior surface with its narrowest end remote from said spine confining means, and biasing means urging said guide means outwardly of said ring so as to urge said spheres toward the narrow end of said frusto-conical surface of said ring, whereby said stud is free to move longitudinally in one direction but is seized and locked upon initial movement in its reverse direction of movement.

5. An apparatus for spreading an elastic binder having a longitudinal lspine and a longitudinal row of aligned, spaced, curled fingers extending transversely thereof, said apparatus comprising a base having a rear wall and spaced sidewalls, a longitudinal row of aligned, spaced retaining yfingers upstandingly disposed along the top of said rear wall for confining movement of said spine, a rectangular work tablehaving a rear edge adjacently parallel to said top of said rear Wall of said base, and spaced sidewalls depending therefrom and pivotally connected to said side- Walls of said base for arcuate movement of said table toward and away from said rear wall of said base, a longitudinal row of aligned loops secured along the edge of said table adjacent said rear wall and adapted for insertion between respective'ones of said curled fingers, removable means adapted for insertion through said aligned loops and along the interior surfaces of said curled fingers, non-reversible continuously variable locking means connected to said table for securing said table in any position of its travel in its arcuate path, said locking means including an articulated stud connected at one end to said table movable longitudinally and downwardly therewith, guide means surrounding said stud at an intermediate portion thereof on the side of said articulation opposite that of said connection, said guide means having a pair of spherical channels therein extending through said guide means on opposite sides of said stud, a pair of spheres held in respective ones of said channels and contiguous with said stud, said spheres being of such diameter as to extend outwardly of said guide means, a ring secured to said rear wall of said base and surrounding the channel portion of said guide means having a frusto-conical interior surface with its narrowest end remote from said rear wall of said base, and biasing means urging said guide means outwardly of said ring so as to urge said spheres toward the narrow end of said frusto-conical surface of said ring, whereby said stud is free to move longitudinally in one direction but is seized and locked upon initial movement in its reverse direction of movement.

6. An elastic binder spreading apparatus as recited in claim 5, further including release means adjacent to said locking means and operatively engaging said lock- 3,023,434 9 10 ing means to eiect release thereof to permit movement of References Cited in the file of this patent Said Stud in a dIeCOIl S0 that the I'ar edge 0f Said table UNITED STATES PATENTS returns adjacent said rear wall of said base.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Pat-ent No. 3,023,434 r March 1962 Edward W. Fox

It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should reed as corrected below.

Column T, line 42, after "frame" insert a comma; column 8, llne 3, after "st-ud" strike out the comme.

Signed and sealed this 19th day of May 19620 (SEAL) Attest:

ERNEST w. swlDER DAVID L. LADD Attesting Officer 4 Commissioner of Patents

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