Abstract: Binding folder for the binding of a bundle of leaves, which binding folder essentially consists of a spine with at least one cover sheet, whereby the spine includes a U-shaped profile with a bottom and two upright arms, whereby the cover sheet is attached to one of the arms, whereby the binding folder is provided with a layer of glue to attach the bundle of leaves in the binding folder. The layer of glue is put on the arm or a rigid extension of the arm such that the layer of glue in relation to the U-shaped profile cannot be folded or moved.

Abstract: A scanning bar hook for displaying packeted items in a shop, has upper and lower limbs with a crossbar extending from the upper limb. A molded plastic assembly pivoted on the crossbar has a display flap for mounting a bar code card, a fin extending from the flap toward the first item and an arrester arm which is insertable between the foremost item and the next item. When the foremost item is advanced for removal it strikes the fin and blocks the removal of all the remaining items.

Abstract: A case assembly of a media binder includes a front surface board and a back surface board. Each surface board includes an inwardly facing surface and an outwardly facing surface and a cover sheet, and each cover sheet is wrapped around the outwardly facing surface of one of the surface boards. A marginal edge is attached to the inwardly facing surface of the surface board, and another marginal edge is unattached to the inwardly facing surface of the surface board. An end of the unattached marginal edge includes an extra edge extended from the unattached marginal edge, and the extra edge is folded against the unattached marginal edge. The unattached marginal edge is attached to the inwardly facing surface of an adjacent surface board to form a corner wrap around a corner of the adjacent surface board.

Abstract: A sheet holder for holding a sheet of paper and exposing an edge of the sheet, has a press for holding the paper sheet and exposing the edge, and a lever for operating the press. The lever is movable between a released position for placing of the edge of the paper sheet in the press and a holding position for operating the press. There is also an abutment for abutment by the edge of the paper sheet to position the edge relative to the press while the lever is in the released position. The abutment is associated with the lever for moving away from the edge of the paper sheet when the lever moves towards the holding position, thereby exposing the edge of the paper sheet.

Abstract: A folder having at least one paper binding fixture affixed to it. Further, the paper binding fixture can be capable of being opened and closed such that when opened sheets of paper can be placed on a male protrusion and when closed the sheets of paper can be bound by releasably coupling the male protrusions to a female opening. Further, the paper binding fixture can have enhanced safety benefits that substantially reduce the risk of injury to a user. Also, the paper binding fixture can reduce the risk of tearing sheets of paper bound by it.

Abstract: A ring binder mechanism having at least one pair of half-ring members that are movable between a first position, wherein the half-ring members are closed, and a second position, wherein the half-ring members are open, and at least one generally tubular member to facilitate alignment and securement of the at least one pair of half ring members when moved from the second, open position to the first, closed position.

Abstract: A modular locking binder system is disclosed having a channel is coupled to the binder spine. The channel has an open end and a constricted region. A channel block is located at the open end of said channel and is configured to block and unlock the channel opening. The modular locking binder system is configured to removably hold a document module within the channel. The document module includes a module spine having a widened portion configured to operatively engage and be restrained by the constricted region of the channel. By either obstructing or un-obstructing the channel with the channel block, it is possible to removeably secure the document module within the channel when the widened ends of the document module are operatively engaged and restrained by the constricted portions of the channel.

Abstract: A document binding system for efficiently securing a plurality of documents together in a professional manner. The document binding system generally includes a first support including at least one post and a second support including at least one opening. The post extends outwardly from the first support and the opening extends through the second support. The post includes a plurality of teeth ending along an outer surface of the post and the opening includes a locking member extending within, wherein the locking member selectively engages at least one of the teeth to secure the first support to the second support, wherein a plurality of documents are preferably selectively secured between the first support and the second support.

Abstract: A binder spine with a generally rectangular back panel that has a width and a length. The back panel is bounded by generally opposed longitudinal edges. The opposed longitudinal edges are joined through living hinges to adjacent side panels. The binder spine is foldable along the living hinges between an open generally flat configuration and a generally closed configuration. At least one post member is located on one of the side panels, and at least one socket member is located on the other side panel. The socket and post members are aligned with one another and include generally cylindrical mating walls. The post and socket members are spaced apart in the open configuration by a distance. The socket and post members are positioned to retainingly interengage one another in the closed configuration to hold the binder spine in that closed configuration. The socket in the socket member receives the post member in a snap fit.

Abstract: A ring binding apparatus comprises a channel-form guide (2), a slide (6) guided by the guide (2) for linearly slidingly guided movement relative to the guide (2) between a first position and a second position, a detent arrangement (42,44) whereby the slide (6) is releasably retained in the second position, and loop-form elements (30) receivable independently of each other between the guide (2) and the slide (6) in the first position and, when the slide (6) is in the second position, locatingly engaged by the slide (6) in positions transverse to the aforesaid linearly slidingly guided movement and parallel to each other. The elements (30) are removable independently of each other following return of the slide (6) to the first position.

Abstract: A loose-leaf binding structure comprises: a connecting unit with hooks, each having a first bent plate, a second bent plate corresponding to the first bent plate, and an arc plate connected to the first and second bent plates, and each arc plate has a connecting portion proximate to the second bent plate and connected to each hook; and a position limit unit, having a guide track on each side of the position limit unit, such that the position limit unit is movably coupled to first and second bent plates by the guide track. Each hook passes through the loose pages and binds the covers between the first and second bent plates and the position limit unit, and thus hiding the connecting unit to give a loose-leaf binder with a flat and even surface, and allowing users to dispose the binder neatly and flatly or writing on the loose page easily.

Abstract: A releasable fastener for an album to permit insertion and removal of pages between the covers. The fastener has a pair of strap anchors each attached to one of the two covers and a strap passing between the anchors via aligned apertures in the covers and album pages. Each strap anchor is in the form of a channel in which the strap is a snap fit so that the strap is releasably locked into the channel and is restrained from longitudinal displacement by inter-engaging formations on the base of the channel and the opposing surface of the strap.

Abstract: A fastener system for binding paper is disclosed comprising a base having spaced first and second ends. A first prong extends from the first end. A second prong extends from the second end. A first member having a first opening receives the first prong, and a second member having a second opening receives the second prong. The first and second members are releasably securable to form a top lock. A method of securing a stack of papers is also disclosed.

Abstract: An apparatus for binding a stack of paper with at least one hole defined therein. The apparatus includes a male element having at least one post with a plurality of teeth. The post is configured to receive the stack of paper by threading the post through the hole. A female element with at least one aperture defined therein is placed substantially over the male element. The female aperture is structured to releasably engage at least one of the plurality of post teeth with sufficient grip to bind the stack of paper together.

Abstract: A loop-type binder comprises tongues (4) attached on its back cover for holding document sheets, and these tongues (4) constantly increase in thickness from their base (6) to their tip (9), thus comprising a deflection resistant tip and an elastic staff at their base. The radius of the joining area (15) from the tongue to the base is by several times smaller on the side facing the back cover than the radius of the joining area (14) on the side that faces the front cover. The stopper (13) that retains the tongue when the binder is open is integrated into the tongue by a slope (12). This tongue design facilitates convenient and gentle handling and storage of documents (FIG. 2).

Abstract: An apparatus for binding a stack of paper with at least one hole defined therein. The apparatus includes a male element having at least one post with a plurality of teeth. The post is configured to receive the stack of paper by threading the post through the hole. A female element with at least one aperture defined therein is placed substantially over the male element. The female aperture is structured to releasably engage at least one of the plurality of post teeth with sufficient grip to bind the stack of paper together.

Abstract: A binding mechanism (2) is provided for securing compact disc sleeves and other sheet material in a notebook binder and which preferably can be quickly and selectively opened and closed.

Abstract: A paper fastener includes a base having two end legs for engaging through sheet materials to be clamped and having two side panels bent relative to the base and two outer flanges folded relative to the side panels and shielded by the side panels. A bar includes two end orifices for receiving the legs of the base, and includes two side flaps bent relative to the bar and two outer flanges folded relative to the side flaps and shielded by the side flaps of the bar. Two retainers are slidably engaged on the bar for securing the paper sheets between the base and the bar.

Abstract: A paper binder includes a binding plate formed with two portions which are bent inwardly into a bottom side of the binding plate for obviating sharp edge which could injure a user, a central portion of the binding plate being pressed to form a recessed portion to reinforce whole structure, the binding plate having two slots at two ends thereof, an inserting member having two shoulder portions which are bent inwardly on a top side of the inserting member to obviate sharp edges, the inserting member being a U-shaped member having two upwardly extending legs, a pair of sliding positioners which are U-shaped members slidably mounted on the binding plate, whereby when in use, papers having two holes punched therein are placed on the two legs of the inserting member by means of the holes, and then the two legs are placed in the slots of the binding plate, and the two legs can be flattened along the binding plate and the sliding positioners will then engage the legs thereby enabling all papers on the legs to be kept

Abstract: A device for binding together a stack of document sheets and optionally for depositing such a bound stack in a file with a filing mechanism, comprising a base plate to be disposed below the document stack, a cover plate to be disposed on the document stack, at least one flexible binding tongue strip which is fixable and/or fixed to the base plate and whose two binding tongues, for the purpose of binding together the document sheets, are threaded through paired perforations in the document stack and the cover plate and are bent back at the ends on to the cover plate above the document stack, as well as at least one cover rail mountable on the cover plate, including the binding tongue ends, with undercuts on the longitudinal edges for encompassing the longitudinal edges of the cover plate, whereby the cover rail is divided into two in its longitudinal direction, so that the two parts are mountable from opposite end faces on the cover plate.

Abstract: A two-piece paper fastener includes a prong base with two prongs extending from two ends of a top surface of the prong base. Each of two sides of the prong base has a first flange folded toward a bottom surface so as to define a rounded side. A compressor with two holes through which the two prongs extend and two retainers are slidably mounted to the compressor. Each of two sides of the compressor has a second flange folded toward a bottom surface of the compressor so as to define a rounded side.

Abstract: The pliable, readily flattenable loop binder for retaining loose-leaf sheets has a mounting strip with an elongated spine, an adhesive on the back of the spine, and a removable liner over the adhesive. Paired transversely aligned loop-forming elements project outward from opposing longitudinal edges of the spine. Off one edge are pliable and readily bendable straps. Off the other edge are strap receivers. The strap of a pair is threaded through a punched hole of punched paper and drawn over the spine and then threaded through its receiver so that the back surface of the strap faces the back surface of the receiver. Each loop formed by a pair of loop-forming elements is teardrop in contour and is flattenable toward the front surface of the spine with a single folded bend in said strap. Locking structures on straps engage the receivers to resist shifting of straps in their receivers.

Abstract: A binder for sheets of paper comprises a bendable cover and a binding system secured centrally of the cover. The binding system has a one piece plastic construction comprising a base portion with first and second bosses formed from and located to either side of the base portion. The first boss has a plurality of spaced apart recesses and the second boss has a plurality of spaced apart posts which lock into the recesses of the first boss when the binder is folded upon itself in a binding position. Also provided are first and second sets of ribs again formed from the base between the first and second bosses. The ribs are hollow and are open from beneath to ease the bending of the binding system when the binder is folded to the binding position.

Abstract: A seal is provided for notebooks and albums to prevent inadvertent opening of the rings and to prevent pilferage of paper, photo album insert sheets and the like. The seal is a continuous band or overlapped loop of plastic material which is heat-shrunk over the rings. In the most preferred embodiment, the material used for the seal in spot welded, such as by ultrasonic welding, to hold it in place during the heat-shrink operation.

Abstract: A photo album assembled with the minimum use of machinery. Making use of a special designed multipurpose plastic holder, a stack of paper or a stack of plastic pockets, a plurality of posts and two pieces of special designed cover panels. By using the multipurpose plastic holder and special designed cover panels, the photo album may appear in different structural looks.

Abstract: A stacked paper fastener having a pair of prongs which may be passed through a pair of holes in a top piece and affixed to the top piece to hold the stacked papers together. The fastener is preferably entirely made of plastic with no sharp edges so that it cannot readily cut a user. Each prong has notches in the outer surface which, when the prongs are passed through a ratchet member, may be pulled tight around the stack of papers. The ratchet member securely holds the stack of papers together until purposely released. The ratchet members have releases which are easily manipulated from above the top piece so that the top piece can be easily removed to add more papers to the stack or to disassemble the stack of papers.

Abstract: A ring binder having an upper and a lower cover blank joined by a flexible rear blank. The binder has at least two aligning tongues extending from the lower cover blank to the upper cover blank for retaining perforated paper. Each aligning tongue is formed as a leaf spring and has a root section, a center section and a tip section, wherein the sides of the center section being narrower than the root. The binder has U-shaped brackets on the upper cover blank for receiving the aligning tongues. A tie section of U-shaped cross section is attached substantially perpendicular to the root section. The tie section has legs having flanges extending outwardly from the free end of the legs. The aligning tongues are configured to be integral with one of the flanges via a reduced cross section in the lower portion of the aligning tongues.

Abstract: A fastening device has male and female portions, the male portion having a base and a downwardly extending post with two vertical series of horizontal ratchet teeth, one on each side of the post, and two convex lobes extending outwardly in diametrically opposing positions between the two vertical series of ratchet teeth. The female portion has a base and an upwardly extending collar consisting of two curved halves. Each collar half has a series of horizontal ratchet teeth on its inner surface. The circular space defined by the collar halves continues through an aperture in the base. The ratchet teeth may also continue on the inside wall of the aperture. To assemble the fastener the collar of the female portion is placed into a binding hole in a stack of paper, and the post of the male portion is placed into the opposite side of the binding hole, with its base mutually aligned with the base of the female portion. The post is pushed manually into the collar, where its teeth lock with the teeth in the collar.

Abstract: A filing strip is of a bendable material. The filing strip has a central elongate anchor strip and a prong extending from each end of the strip. Each prong has a tip portion and an intermediate portion. Each tip portion is narrower than its adjacent intermediate portion. The invention extends to a filing accessory for use with the filing strip, The accessory includes a pair of elongate members. A socket defining element is arranged on an end of each member. Each socket has internal dimensions complementary to the tip portion of the prong and external dimensions which are substantially equal to external dimensions of the intermediate portion of the prong. The invention also extends to a filing accessory for use with a filing strip having a pair of opposed prongs. With this accessory a free end of each socket defining element is chamfered.

Abstract: A container for removably storing an article such as a video game, and for securing sheet material to the container, such as the instruction booklet for the video game, to prevent separation of the booklet from the container. The container has a base and a pivotally mounted lid which forms an internal storage compartment with the base. A hinge assembly having an elongated panel and pair of hinge strips pivotally mount the lid on the base. A holder bar is secured to the hinge panel. A pair of flexible straps are provided at the ends of the holder bar and form a pair of loops which extend into the storage compartment of the container when the lid is closed on the base. Other ends of the straps extend through holes formed in the booklet to mount the booklet on the straps, after which the ends are snap-fitted through locking holes formed in the holder bar to permanently secure the booklet on the loops within the container.

Abstract: An apparatus for viewing and removing selected documents retained in file folders having a flat metallic fastening member. An element (40) is formed comprised of a first arm (50), a second arm (52) and a connecting section (54). Each arm is a solid, cylindrical member which is essentially U-shaped and with a vertical slot (60) in the unconnected end of the arm, which slot is capable of receiving and holding the extended prong (26, 28) of the fastening member (24) of the file folder (20). The upper end of each slot has an inverted syncline cut (72) to hold the tapered end of the extended prong. This apparatus facilitates the viewing of a selected document, the removal of a selected document or documents, or the insertion of an additional document or documents after the overlying documents have been removed and placed onto the apparatus. This apparatus further facilitates the replacement of the removed overlying documents back onto the metallic fastening member.

Abstract: A paper binder for folders, the binder comprising a U shaped loop (2) to be attached to the folder (1) by a clip (6). The loop is in two parts, one part (4) being rotatable in the clip, and the other part (3) non-rotatable in the clip. The two parts are releasably attachable to each other to allow sheets of paper to be placed on the non-rotatable part.

Abstract: A sheet fastener hinge device to removably hinge a second cumulative stack of flexible sheets to a first cumulative stack of flexible sheets. A first elongated panel has a pair of spaced holes or an elongated slot to receive the prongs of a first sheet fastener extending through a pair of apertures spaced adjacent one edge of the sheets in the first stack to removably attach the first panel to the front of the first stack. A second elongated panel has a pair of integral spaced prongs extending therefrom or a pair of spaced holes to receive a second sheet fastener to provide a pair of spaced prongs extending therefrom. The prongs extend through a pair of apertures spaced adjacent one edge of the sheets in the second stack to removably attach the second stack of sheets to the second panel.

Abstract: A binder for multiple sheets of paper employing a simple ratchet mechanism to secure the paper without the need for punching holes in the paper. The binding device includes a base member which is an elongated bar of L-shaped cross section with integral end plates. The binding device further includes a mating clamping member which is a slotted plate with an internally extending tongue. The back wall inside surface of the base member has a series of parallel, elongated saw-tooth ribs or grooves forming teeth with which the tongue engages in a ratchet-like manner. The teeth may be spaced in a staggered type arrangement to increase their effective number. Grooves forming teeth may also be placed on an outside surface of the base member back wall to increase the binding force. The end plates may be slotted to accept a finger adapted with notches on an underside to further ensure that the papers are securely bound.

Abstract: A file clip which has a base with two spaced elongate, flexible, serrated members, and a retainer with two spaced apertures through which the members pass. Punched paper sheets are threaded on to the elongate members. Adjacent each aperture the retainer has a flexible tab which is flanked by two upstanding undercut formations. The tab has locking formations which are engageable with selected serrations on the respective elongate member thereby to secure the retainer to the base.

Abstract: This invention concerns a paper binder which will enable papers bound therein to be paged in a manner similar to those of a bound book and is made up of a spine member with an adjustable clamping device for holding a bundle of papers against the spine member and a pair of cover connector plates hingedly connected to each side of the spine member with the clamping device in the form of a pair of clamping plates with a pair of flexible elements to thread through a bundle of perforated papers to tie the plates together with the papers securely held between the plates.

Abstract: A clipboard for holding worksheets is disclosed, which is a plastic rectangular board bent into a largely inverted U-shaped cross-section having a vertical front board, an also vertical backside board that is larger in length than the front board, and a horizontal top roof member between the front and backside boards. A book of worksheets is clamped between the front and backside boards below the roof member. A hook for hanging the clipboard is centrally fixed in the roof member and having means t orient the clamped worksheets in two alternative different vertical planes perpendicular to each other. A pair of bosses centrally mounted in the backside board and each having at a front end thereof a downwardly inclined end face for engagement with a pair of apertures formed in the front board through a pair of holes in an upper margin of each worksheet clamped.

Abstract: A bookbinding apparatus for binding together perforated sheets comprises a first strip, spaced-apart studs extending from the first strip, spaced-apart locking caps extending around each stud, a second strip, spaced-apart first openings extending through the second strip, each first opening being aligned with a corresponding stud of the first strip and each first opening having a size larger than the cross-section of the corresponding stud of the first strip to freely receive the stud, and a locking member formed on the second strip for locking the studs to the second strip, the locking member including second openings, each second opening being located next to and in partial contact with a first opening, and each second opening having a size smaller than the cross-section of the studs at a locking cap but larger than or equal to the cross-section of the studs between locking caps such that the second strip after receiving studs of the first strip with the first openings in the second strip locks the studs of

Abstract: A molded plastic binding for positively securing a plurality of sheets of thin material having apertures along one edge, wherein two binding strips are provided, one with projecting fingers which mesh with the apertures of the thin material and apertures of the second binding strip; wherein the linear protrusions on the projecting fingers of the first binding strip lock beneath wedges along elongated holes on the second binding strip so that the sheets are securely fastened together against accidental or deliberate opening. A preferred embodiment incorporates rectangular apertures in the thin material on any multiple of 0.5625 inch centers with the fingers having a cross-section considerably less than the area of the individual apertures of the thin material but with a finger width slightly less than the narrow side of the rectangular aperture.

Abstract: A prong-type stacked paper fastener comprises a staple component having perforated prongs and a compressor component having tang means designed in the operative position of the fastener assembly to enter selected ones of the prong perforations in order to maintain the compressor mounted snugly to the paper stack. Slide locks mounted on the compressor releasably lock the prongs in a folded-over, operative position. Detents on the slide locks engage selected perforations of the staple prongs, preventing inadvertent slippage of the slide locks.

Abstract: A paper sheets binder has a pair of elongated strips, one strip mounting a number of spaced integral hinged pawls and the second strip mounting a corresponding number of spaced integral bifurcated ratcheted posts. The strips are mounted on front and back margin edges of a paper sheets stack. The ratchets on the post legs of one strip connect with pawls on the other strip. To prevent disassembly of the bound document, the preferably D-shaped in cross-section post legs are oriented so that the end posts have a major axis parallel to the longitudinal axis of the strip. Breakage at the root of the post legs is essentially prevented upon bowing of the document and strips, and from shear forces resultant from slippage of the paper sheets and the force generated by the shifting edges of the paper punch holes. The central post is oriented so that the legs major axis is transverse to the strip longitudinal axis.

Abstract: A film stacker clip arrangement (10) for a stack (100) of sheets of film (101) or flats having aligned apertures (102) wherein the arrangement (10) includes a plurality of clip units (11) having a male member (15) and a female member (12) connected by a flexible strap element (21) so as to captively engage the stack (100) of film along at least one edge.

Abstract: A paper binding fastener for use with a conventional prong type fastener includes a rectangular strip of a deformable material which has elongated tab portions at opposite sides thereof. The rectangular strip has a pair of parallel fold lines which allow the rectangular strip member to be folded into a five sided rectangular channel shape. Each of the tab members have a pair of folded lines which are adapted to be folded laterally to form sidewall portions of the five sided rectangular channel. A pair of holes in the top and bottom edges of the rectangular strip member and an additional hole in each of the tab members are in axial alignment at each side of the folded channel member. This allows insertion of a conventional prong type paper fastener. In a modified form, the holes in the tab members are replaced by a plurality of spaced slits to allow a range of adjustment for different paper sizes.

Abstract: This is a booklet binding system which includes an elongated closure unit specifically constructed and arranged to be removably inserted between the two rows of opposed spaced apart loops of a wire loop binding unit, wherein the closure unit defines a pair of spaced apart loop receiving grooves specifically oriented and arranged to receive the two rows of loops to interlock therewith and provide the desired closure therebetween.

Abstract: Retainer element for releasably inhibiting movement of a restraining clip along a clinched blade end of a staple used to bind one or more pieces of sheet material. The element is wedge-shaped, inexpensively formed and inserted between the clinched blade end and a yoke or between the blade end and its restraining clip to frictionally prevent movement of the clip during transport and storage of the bound sheets.

Abstract: A binder assembly comprising a binder cover and a binder body is detachably coupled to a file. The binder cover has a protrusion and the binder body has an end protrusion being formed at the outer sides of one end of the binder cover and body. The binder assembly can cover the upper and lower ends of a guide card mounted on a shelfback of the file to keep the guide card at the suitable position thereon.

Abstract: An elastic clip with positioning means for positioning of perforations, including a bottom block with an U-shaped frame bar movably mounted thereon, which U-shaped frame bar is having two positioning rods for positioning of paper documents through two punched holes made on the paper documents. The bottom block is having a bridge frame integrally extended from the rear portion to project upward and to bend forward by means of a folding line, with the front end of the bridge frame formed into a tongue plate for clamping of paper documents and with an arch frame integrally made thereon at the top to reinforce the clamping effect of the tongue plate.

Abstract: A binding folder is provided which includes a foldable plastic cover having a bottom part for anchoring fastening strips which extend through perforations in paper sheets to be held. The top part of the cover forms a counterholder with two pairs of slots for respective ends of the fastening strips. The slots are spaced a predetermined distance from one another and are configured to permit sliding movement of the fastening strips during folding movement of the top and bottom parts so that the paper sheets can be manipulated without requiring removal of same. In certain embodiments the counterholder is provided in a separate folding piece.

Abstract: A prong or tang-type paper sheets binding system includes a cover marginal edge on which or over which the connector base and the prongs or tangs are abutted or bent with respect to the edge. An integral imperforate edge extension is provided which is foldable over the bent prongs and any keeper and foldable over the prong base or head to cover the exposed unattractive metal components of the connector including the prongs or tangs. In a preferred embodiment a second integral edge extension which contains a slot sized to encompass the bent prongs and a keeper if employed, or the prong base is foldable over the imperforate extension so that a planar smooth-finished surface of the imperforate extension covers the otherwise exposed metal components of the connector.

Abstract: In a sheet binder (1), which consists of a rear cover (2) and a front cover (3) connected with each other by means of a folded spline strip (4), in the area between the rear cover (2) and the front cover (3), a strap (10) is provided in the area of the fold (5), this strap being connected with the binder (1). Prongs (13, 14) extending essentially parallel to the fold (5) are punched from the rear cover (2). The prongs (13, 14) are inserted for the binding of the sheets (15) into holes (16) provided in the strap (10) and then passed with their free ends downward through further holes (17) provided spaced apart from the holes (16) in the strap (10). To simplify the insertion of the prongs (13, 14) in the strap (10), the holes (16) have open through connections (16') toward the free end of the strap ( 10).