DE2004292A1 - Quick release fastener - Google Patents

Description

Kaτ I A. B ro s e

D> ', j! -Ing '

D-8023 Mönchen - Pullach Wienersfr. 2, T.-Hdin, 79335 70.7 9317 82

Dot> / 5581/69 "Munich-Pullach, January 30, 1970

GO SCREWS & FASTENERS LIMITED, Heath Street, Smethwick, Warley , Worcester, England

Quick release fastener

The invention relates to quickly releasable fastening or Locking devices for holding perforated parts together in an area-to-area ratio.

In the patent specifications No. 1,136,662, 1,136,897 and 1,14-2,142 of the applicant, such locking devices are described and claimed, in particular for holding together "thin plates of a certain material, usually λ metal, in a face-to-face Ratio are constructed., "■

The present invention relates to a detachable Closure of the type described above for holding two perforated parts together in an area-to-area ratio, at least one of these parts being thicker than that in the above-mentioned patents described and illustrated Plates is. The thicker material can be in the form of a multilayer corrugated cardboard, a sheet of plywood or a Wood fiber board or another similarly designed

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Plate present. The fastener is for fastening two such thicker parts together or for fastening one these thicker parts are constructed on a thinner part such as a metal frame or plate been.

The releasable fastener according to the invention for holding together a first perforated and a second perforated part has the following components: a rotating piece with a shaft _. with a head at one end of the shaft and a fastening projection at the other end of the shaft, a holding piece to be assembled with the first part, which has an opening for receiving of the shaft and the rotary piece can hold on to the first part, but a relative rotational movement of the rotary piece allowed with respect to the holding piece and having parts that engage in the first part to a rotary movement of the retaining piece in relation to the first part to prevent a joint to be assembled with the second part Cam piece with an opening for receiving the shaft and the fastening projection and with a cam surface, with which the cam piece with the projection when rotating

_! of the rotating piece and after the passage of the projection engages through the opening so that the shaft is drawn through the opening, with the cam piece as well Having parts that engage in the second part in order to rotate the cam piece with respect to the two- ! th part to prevent, and wherein the retaining piece and / or the cam piece is a pan with a bottom wall and a Side wall and the bottom wall the opening for receiving the shaft and the side wall an outwardly directed

! th flange at its »free edge, the Hal-testüok and / or Nockenstüok furthermore a ring with an outwardly directed splash and the ring or the pan

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Eioh complementary parts next to the bottom wall of the pan so that the Hing can be brought into or out of engagement with the socket by a snap action, wherein a spring is provided flbhiießlioh, the one Withdrawal of the shaft through the opening.

When using the lock, a piece in the form of a pan and a ring is attached to each of the thicker parts. Assuming that the Vereohlufl is used to jewel pieces of thicker material, such as multi-layer corrugated paperboard, to be connected together, then, the holding piece at "a" of the corrugated parts fixed _t by a suitable Looh 1 "corrugated portion prepared and then the pan is inserted into the Looh so that its flange overlaps one edge of the hole, whereupon the ring springs up on the pan so that the ring flange overlaps the other edge of the Boches and the piece is held on the corrugated cardboard part due to the fact that the flanges overlap the edges of the hole, and in a similar manner the cam piece is attached to the other part of the corrugated cardboard in which the hole is prepared and then the pan is inserted into the hole so that its flange overlaps one of the edges of the hole, whereupon the Ring springs open in such a way that the ring flange overlaps the other edge of the hole so that the bottom sides of the pans are next to each other and the shaft and the protrusion of the rotating piece are guided through the hole in the hook and then the rotating piece can be rotated so that the projection comes into engagement with the cam surface and the two parts can be attached to one another.

I must include one of the parts made of a thin material such as " Metal strips or sheet metal, so is the piece that goes with it,

i.e., the retainer or the cam piece in the embodiment disclosed in the patent No. 1 136 897 of the applicant described form, wherein such a cam piece or holding piece the Nookenstück or Haltestüok with pan and ring, as in example described above.

Preferably, each of the pieces is made of synthetic resin and each pan and / or the ring associated with it is made of elastic material Made of synthetic resin material and the complementary parts consist of a groove on the pan or, on the ring and a rib on the ring or on the pan.

The means for preventing relative rotation between the parts, which are designed in the form of a pan or a ring and the associated part, for example a corrugated cardboard part, preferably consist of ribs on the outer surface the pan side wall, which engage in this part.

If the cam piece is designed in the form of a pan and a ring, it preferably has cam means in the form two projections on the bottom part and within the Pf an-

; ne, these projections being diametrically spaced across the opening and each

™ projection has one of said cam surfaces. Each protrusion may have two cam surfaces, the nook surfaces of each protrusion being separated by a locking member. If the holding piece in the form of a pan and _s is formed of a ring, then the opening is for receiving the shaft in the holding piece on the bottom wall of the pan and is shaped and dimensioned such that the other end of the shank that is, the end of the shaft, which is remote from the head, snaps into this opening, so that a central section of the shaft is rotatable in this opening.

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The hole in the socket of the holding piece can have a central section for the passage of the shaft and a side section for, have the passage of the fastening projection, the side portion having an opposing pair of resilient tongues extending therein and become elastically insane when the said other end - " of the shaft snaps into the opening.

The embodiments according to the invention will now be described in more detail, for example, with reference to the accompanying drawings; show in it: '.

Pig. 1 is a perspective view with parts broken away a closure according to a first embodiment of the invention;

2 shows a bottom plan view of the holding piece of the closure of Fig. 1;

Pig. Figure 3 is a bottom plan view of the I-cam of the latch the pig. T;

Pig. 4 shows a vertical section along the line IV-IV

the pig. 3; '. |

Pig. 5 shows a section through the assembled closure the pig. 1, wherein two multilayer corrugated cardboard sheets attached to one another shown. are.

Pig. Figure 6 is a sectional view of broken away parts of the closure according to a second embodiment of the invention using an ITock piece of in Pig. 1 type shown and a retaining piece of the type shown in patent specification 1,136,897;

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FIG. 7 shows a perspective view of the holding piece according to FIG. 6;

8 is a sectional view of broken away parts of a closure according to a third embodiment of the invention using a nose piece of the type shown in patent specification 1,156,897; and

FIG. 9 is a perspective view of the cam piece of FIG. 8.

Fig. 1 shows a closure with a rotating piece 10, a Holding piece 11 and a cam piece 12. The rotating piece 10 has a generally cylindrical shaft 13 a head 14 at one end of the shaft, the other end 15 being rounded. The head 14 has one not shown Cross slot, while a conical collar 16 with a free edge 17 hangs down from the head. The collar is sufficiently thin to deform when the closure is in use, acting as a spring as follows described.

A central portion of the shaft between the head 14 and the end 15 is provided with four flats, one of which shown at 18. These flats are spaced from one another at equal angles around the longitudinal axis of the shaft arranged. The flats extend from the head 14 and terminate at the end 15 in the shoulders 19. From the Shank 13 next to the end 15 extend two fastening projections 20th

The rotating piece is provided with a generally designated 21 " Handle provided with a male part 22 with a

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upper section 23 with a seohskantigen cross section and a subsection 24 having a circular cross-section having. Between the section 23 and the section 24 there is a hat 25. The other end of the Steokteiles has a transverse piece 26 attached to it and the plug-in part can be inserted into a bore, not shown, in the shaft 13 of the DrehBtUokes are used so that a rib in this Hole engages in the hat and the handle in position holds, wherein the Queretliok 26 engages in the slot in the head 14, thus allowing the rotating pouch to be rotated.

The Haltestüok 11 has two gelle, a pan, which is indicated generally at 27 and a ring, which is indicated generally at 28. The pan 27 is generally flat. Bottom side 29 with a rim 30 which forms an extension or a protrusion of a first side wall section 31 of the pan The pan has a second side wall section 32 with a larger diameter than that of the side wall section 31 and with a greater axial extent, and the side wall 32 ends in one after outward Plansch 33 of an outwardly tapering cross-section, as shown in Fig. 5 clearly ersieht- j lent let · The first Seitenwandabsohnltt 33 has a hat. The second side wall portion 32 has six ribs 35 located at a distance from each other, the sj _t, ch of Außenoberfläoht VQN dta Seitenwandabsohnittes radially extend * The flange has two projections integrally formed with it display 36. _r

In the bottom part 30 there are three openings, one central opening 37 and two side openings 38 are provided. The opening 37 has a middle section 39 and two side sections 40 * The Middle section 39 has two opposite straight ^ edges,

^ 009833 [71 408 _r: _

41 on which flattenings form that with the flattenings 18 of the rotating piece, as described below, come into engagement. Two elastic tongues 42 extend in one side section 40 each.

The construction of the ring 28 is from the consideration of KLg. 1 and 5 clearly visible, the ring having a flange 43 with a tapered cross-section and an inwardly directed rib 44 which engages the hat 34.

EB can be seen that the plansche 33 and 43 to the outside are geriohtet and that the groove 34 and the ribs 44 are complementary parts and are arranged so that the Ring 28 can be brought into engagement and disengaged from the socket 27 by son-engaging action.

The retainer is shown in Figures 1 and 5 as assembled with a first part 45 which is made from a multi-layer corrugated board consists with the pan seated in a hole 46 of part 45 which is in snug abutment with the side wall 32 is so that the ribs 35 extend into the material of the part 45 and a relative rotation between the Prevent pan and this part 45. The flange 33 overlaps one edge of the hole, and after the pan is inserted into the Hole has been inserted, the ring 28 comes into engagement with the socket to assume the position shown in Fig. 5, it can be seen that the flange 43 overlaps the other edge of the hole 46. The holding piece will in this way, therefore, to an axial movement in the hole 46 through the flanges 33 and 43 and to a relative rotation with respect to the part 45 prevented by the fact that the ribs 35 engage in the material of this part 45.

The cam piece 12 has a socket 47 and a ring 48

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on. The pan 47 is the pan 27 with the exception of theirs. Partly similar to the bottom. Thus, the pan 47 has a first side wall section 48 and a second side wall section 49, an outwardly directed flange 50, and ribs 51 extending radially from the second side wall section 49 provided with a rib 53 in the hat 52 with. Snap sit ζ sit. The ring 48 also has a paddling 54. i? Lansehe 50 and 54 have a tapered cross section and are as of Mg, 5 clear ER 'ä clearly directed outward.

The bottom wall 55 of the socket has an opening 56, the ■ a central section 57 for the passage of the shaft of the Drehstüekes and two side sections 58 for. the Passage of the fastening projections 20 of the rotating piece having.

The bottom wall 55 has two projections, one of which shown at 59, these projections within the socket: 47 and diametrically spaced across opening 56 lie apart. These protrusions are identical and white | sen each two Uockenoberfläehen 60, which are separated by a lock 61, ·.

In the pig. 1 and 5, the squat piece 12 is shown, which is shown in FIG a second part 62 or a multilayer corrugated cardboard part sits. The cam piece is attached to the second part by forming a hole 63 therein in which the second side wall portion 49 sits in full contact, the pan 47 being inserted into the hole in such a way that the ribs 51 engage in the material of the second part 62. The ring 48 is then placed on the pan with the rib 53 in; the groove 52 engages. The cam piece is so through the

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outwardly facing puddles 50 and 54 prevented from axial movement with respect to the part 62 while the cam piece is prevented from doing so by the ribs 51 is to perform a rotary movement with respect to the second part 62. The flange 50 has diametrically opposite one another Display projections 64 which are similar to the projections 36.

When using the lock, the holding piece 11 or the cam piece 12 on the first or second part 45 or 62 attached in the manner described above. The plug-in part 22 of the handle 21 is in the Uc hole of the rotating piece 13 inserted and locked therein by the rib in the bore which engages in the groove 25. Then the turning piece brought into engagement with the holding piece 11. The rounded end 15 of the male part is through the middle section 39 of the central opening 37 is pushed into the bottom wall 29. The diameter of the cylindrical end section of the shaft is slightly larger than the vertical section between the edges 41 of the opening, so that the material deformed on the bottom wall, this deformation being facilitated by the side openings 38. About that in addition, the fastening projections 20 come into engagement with the elastic tongues 42, the end of the rotating piece must be pushed through the opening 37 and snaps into place, since the tongues 42 return to the positions shown, after the fastening projection has passed them, the distance between the edges 41 being slightly larger is than the distance between the opposing flats 18 of the shaft. So go once the fastening projections 20 and the end 15 through the opening 30, the rotating piece is held in the holding piece, but it can rotate in the Haltestüok because the diagonal Dimension of the shaft in one of the flats 18

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Containing Abaohnitt slightly larger than the vertical distance βwischeη the edges 41 eats, the latter deform sufficiently to allow the rotating piece to rotate; However, the rotating piece is held in one of the aforementioned positions by the cooperation of the edges 41 and the flattenings 18. In fact, in two of the said positions, the fastening projections are aligned with the side subsections 58 of the opening 56 in the bottom wall of the cam socket, while in two positions the fastening projections are at right angles to the side subsections 58 * and come into engagement with the locking members 61 , as described below. *

The pans 27 and 47 come with their associated parts

45 and 52 in engagement that the fastening projections ge 36 of the one pan with the fastening projections 64 align with the other pan. Is the crosspiece 26 of the handle at right angles to the line between the

YorsprUngen 36, so are the fastening projections

20 in a position in which they through the openings can go through in the bottom wall of the Haltestüokes, wherein sioh then the lock in its unlocked position * is located. As soon as the shaft of the rotating piece has opened the opening 56 has crossed, the fastening projections with the

Hookenoberfläohen 59 are brought into engagement by

the rotating piece is rotated by means of the cross piece 26 to ts to align with the projections 36 of the retaining stuokes.

As a result, the shaft of the Drehstüokes through the Opening 56 sucked until the fastening projections 20 with

the locking members 61 come into abutment. While the shank ' of the rotating sleeve is pulled through the opening 56, the

Flattened collar 16, which then acts as a spring, which the Fastening Bvoraprünge 20 presses into the locking members 61.

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The edge 17 of the collar comes with the top surface the bottom wall 29 of the pan 27 in engagement. The closure is shown in Fig. 5 in its locked position, in which the fastening projections 20 with the locking members 61 are in engagement. The lock can be released by the rotating piece is rotated with the help of the cross piece 26 to the fastening projections 20 with the lateral To align sections 58 of the opening of the cam piece so that the parts 45 and 62 can be separated. As above described, the rotating piece is held in the holding piece, whereby by the cooperation between the flats and the edges 41 an unintentional twisting of the rotating piece is prevented so that once the parts 45 and 45 are brought together again, the rotating piece - if not intentionally rotated - assumes the correct position in which the fastening projections 20 extend through the opening 56 can move.

Fig. 6 shows an arrangement in which the closure is used for connecting a thin metal strip or a Bleohteil with a thicker part, such as a corrugated fiber board or hard cardboard. In this arrangement the cam piece is designed as described with reference to Figures 1 to 5, the cam piece, its ring and the part on which it is fastened being provided with the same reference numbers as are used in these figures. The metal strip or piece of sheet metal is shown at 64 and the holding piece at 65. The turning piece 67 is identical to that described with reference to FIGS. 1 to 5, so that the rotating piece and its parts are provided with the same choose Bezugsz & that are used in these figures.

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The holding piece 65 has a flange 66 with a central hole 67 on. This central hole has a central portion 68 that is circular and large enough to accommodate the shaft 13 of the rotating piece. The hole 67 also has two side sections 69 which are at diametrically opposite one another Sides of the central portion 68 lie and have a size that allows the passage of the fastening projections 20, so that the rotating piece can move through the hole 67.

A slotted part 70 hangs down from the flange 66 and has two parts 71 separated by a slot 72 are. The slotted part 70 has a split bushing which has a bore 73 for receiving the shaft of the rotating piece having. In the bore 73 of each part 71 there is a flat, one of which is shown at 74, where it can come into engagement with the flats 18 of the shaft of the rotating piece.

The outer surface of each part 71 is provided with a groove 75 which lies between the flange 66 and a beveled shoulder 76 of the part 71. The outer surface a of each part is cut away in groove 75 to form flats, one of which is shown at 77, which flat 77 is aligned with flats 74. A projection 78 hangs down from the flange 66 and is aligned with the central axes of the lateral sections 69 of the central hole 67. The side portion 69 closest to this tab 78 has a sharp end to indicate to the person installing the closure that the tab 78 will abut that sharp end.

For the use of the closure according to FIGS. 7 and 8 is the cam piece 12 on part 6? ^ vf> ίβη oeεehrebene type

009833 / U08 " ^U "

attached. The holding piece 65 is attached to the plate or to the strip 64 by pushing the beveled projection 76 into an opening 79 in part 64 , whereupon the parts 71 are brought together and pushed through the opening 79 until the edge of the opening 79 is cleared from the hats 75 is included. An opening (not shown) is provided in the part 64 for receiving the projection 78 in order to prevent the holding piece 65 from rotating relative to the part 64. The shaft of the rotary piece 10 snaps into the bore 73 of the holding piece, and as soon as the end 15 is pushed through it, the rotary piece is held in the holding piece; however, it can rotate therein and the flats 18 cooperate with the flats 74 to hold the rotary piece in one of the desired positions in the same way as the rotary piece by the cooperation of the flats 18 and the edges 41 in the embodiment of FIG. 1 to 5 is held.

So the retaining piece 65 is attached to the part 64 and the rotating piece 10 is held in the holding piece, the two parts 62 and 64 can be connected in the manner described above by placing the end 15 * and the fastening tabs through the opening 56 in the bottom wall of the cam piece so that they are in contact with the cam surfaces 60 in Engage and come into abutment with the locking member 61. In this arrangement, the edge 17 of the collar 16 comes with the The flange 66 of the retainer 65 engages and pulls the attachment tabs 20 into the locking members 64.

FIGS. 8 and 9 show an embodiment in which the holding piece and the turning piece with in the Pig. 1 through 5 are identical. The one in Pig. 8 reference used for the Drehetüok vmd for the holding piece and its parts

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Tahlen are therefore with those used in FIGS. 1 to 5 BougB numbers identical. The retaining piece is also as on the part 45 shown attached.

The rotating piece and the holding piece are in combination with a Nookenstüok, such as that shown in Fig. 9, is used, which is mounted in a second part 79 or a metal strip or sheet, the part 79 being a has opening 60 in a curved part 81.

The cam piece indicated generally at 82 has • inen flange 83 with a central hole 84, that a central circular section 85 and two lateral Abeohnitte, one of which is shown at 86, wherein dl · lateral separation diametrically opposite and so are dimensioned that they allow the Durohgang of the fastening projections 72. The middle section 85 allows the passage of the shaft 13 of the rotating piece

The hook piece has a slotted part that is in shown generally at 87 and having two parts 88 separated by a slot 89. Each part 88 | is provided with two hook surfaces, two such hook surfaces being shown at 90 and the two surfaces of each part 28 separated by a locking member 91 are. The slotted portion 87 has a split sleeve and the bore of the sleeve is shown at 92. Every part 88 is provided with a groove 93 between the flange 83 and a beveled shoulder 94. Flusch 83 is with provided a projection 85 which is arranged at a diameter at right angles to the diameter that the Side paragraph 86 contains. The flange 83 is provided with an apex 96 to indicate the position of the projection 85 to the installer. For the use of the.

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Closure according to FIGS. 8 and 9, the holding piece 11 is attached to the first part 45 with reference to FIG attached to 5 described manner. Then the turning piece

10 attached to the holding piece 11, as described with reference to these figures. The cam piece 82 is on the second Part 79 is secured by sliding the slotted part 87 into the opening 80. ' This is dated from the beveled Approach 94 promoted so that the parts 88 come together and traverse the openings so that the edge of the opening

ψ is received by the grooves 93. The boss 85 is received in an opening 97 in part 79 to prevent the cam piece from rotating. The two parts 16 and 79 can now be fastened to one another by pushing the end 15 of the shaft of the rotating piece and the fastening projections 20 through the opening 84 and then rotating the rotating piece so that the fastening projections engage the locking members 91. The edge of the collar 16 comes with the bottom wall 29 of the Haltestüokes

11 engages and acts as a spring holding the fastening protrusions 20 presses into the locking parts 91.

P All parts of the closure are preferably made of synthetic resin, the material from which the Holding pieces and the cam pieces are made, preferably elastic, although this is not for the rotating piece is required. Suitable materials for the Hookensttick and the retaining piece is nylon and an acetal homopolymer for the rotating part.

It can be seen that the releasable fastener according to the invention can be used to hold two parts together where- " of a comparatively thick one, such as

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cardboard, plywood or fibreboard. Such a part
can be on another part of the same thickness or on one
thin part, for example a steel strip or steel sheet, as described above, are attached.

gat resists claims

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Claims (11)

- 18 - Claims '' Detachable fastener to hold a first perforated one together and a second perforated part, characterized by a rotating piece (10) with a shaft (13) a head (14) on one shaft end and a fastening projection (20) on the other shaft end, one with the first part (45) to be assembled holding piece (11) which has an opening for receiving the shaft (13) and w can hold the rotary piece on the first part (45), but allows a relative rotary movement of the rotary piece (10) with respect to the holding piece (11) and has parts which engage in the first part (45) to a rotary movement of the holding piece (11 ) with respect to the first part (45), a cam piece (12) to be assembled with the second part (62) with an opening for receiving the shaft (13) and the fastening projection (20) and with a cam surface with which the The cam piece (12) engages with the projection (20) when the rotating piece (10) is rotated and after the projection (20) has passed through the opening "comes so that the shaft (13) is pulled through the opening is, wherein the cam piece has parts that engage the second part (62) to rotate the To prevent the cam piece (12) in relation to the second part (62) and wherein the holding piece (11) and / or the cam piece (12) a pan (27,47) rait a Bo- / den wall (29) and a side wall (31) and the bottom wall the opening for receiving the shaft (13) and the Side wall an outwardly directed flange (33) has its free edge, wofcei the holding piece (11) j and / or the nook piece (12) also has a hanging ait ■ outwardly directed KLansoh (43) and the ring or the - 19 -009833 / U08 Frying pan with complementary parts next to the bottom wall the pan, so that the ring with the pan through Snap action can be engaged or disengaged 2. Closure according to claim 1, characterized in that each of said files is made of synthetic resin. 3 «A closure according to claim 2, characterized in that made of elastic ä translucent material, the pan and / or its associated ring 1st and that the complementary parts of a groove * (52) to the pan (47) or on the ring (48) and there are no ribs (53) on the hanging (45) or on the pan (47) » 4 · Closure according to one of the preceding claims, characterized characterized in that the means for preventing rotation between each rope, which is in the form of a Pan (27) or «a ring (28) is formed, and the part of ribs (35) assigned to it on the outer surface consist of the side wall of the pan, which engage in part (45) · * I 5 »Closure according to one of the preceding claims, characterized characterized in that the cam piece (12) is in the form a pan (47) and a ring (48) and cam means in the form of two separate projections (59) on the bottom wall (55) and inside the pan (47) having, these projections transversely through the opening (56) diametrically opposed to each other at a distance and each projection has one of said cam surfaces, 009833 / 1Λ08 6. A closure according to claim 5, characterized in that each projection has two of the cam surfaces (60), the cam surfaces of each projection (59) being separated by a locking member (61). 7. Closure according to one of the preceding claims, characterized in that the holding piece is in the form of a Pan or a ring is formed, wherein the opening receiving the shaft is in the pan of the holding piece located in the bottom wall of the pan and shaped and sized so that the other end of the shaft snaps into the opening and that a central section of the shaft is rotatably arranged in this opening. 8. closure according to claim 7, characterized in that the opening in the socket of the holding piece has a central section (39) for the passage of the shaft (13) and has a lateral section (40) for the passage of the fastening projection, the lateral Section has two opposing elastic tongues (42) extending in this, said Tongues are elastically displaced when the other end of the shaft snaps into the opening. 9. Closure according to claims 5 and 7 or according to one of claims 6, 8 and 9 in connection with the claims 5 and 7, characterized in that the pans are arranged back to back when the lock is installed with their bottom walls side by side. 10. Closure according to one of claims 5, 6 and 7, characterized in that the holding piece (65) consists of a single one Piece made of an elastic synthetic resin material and has a flange (66) which has a hole (67) 009833 / U08 ~ -21- with a central section (68) that is so sized is that it allows the passage of the shaft (13), and with a lateral portion (69) which is so "that it allows the passage of the fastening projection (20) made possible, with a slotted Part (70) extends from the flange (66) and forms a split bush, the bore (73) of this bush with is aligned with the central section and the slot in said part is aligned with the lateral section and wherein a .Nut (75) in the outer surface of the bush between | see the flange (66) and the end of the bushing that goes from it is provided and the parts of the socket can be moved against each other, so that you End section into the opening of the part on which the Retaining piece must be fastened, snaps in "and the edge of the opening in question is taken up by the groove, there is also a lug (78) on the flange (66) capable of engaging said part, in order to prevent the piece from "making a rotational movement in relation run on it when it is attached to it. 11. A closure according to any one of claims 7, 8 or 9, characterized in that the holding piece consists of a single piece made of an elastic synthetic resin material and has a flange with a hole having a central portion which is dimensioned so that the passage of the Shank is enabled, and has a side portion which is dimensioned so that the passage of the fastening projection is enabled, a slotted portion extending from the flange and forming a split sleeve, the bore of which is aligned with the central portion, while the slot ie said part with the side step is from ^ eriaiitet, and where _; a lut in the outer surface of the i <y- ~~ .. & ® "between the flange ! '■' · ■ - "22 - · Q08833 / 1408 and the end of the bushing remote therefrom is provided and the parts of the bushing can be moved towards one another so that its end portion can snap into place through the opening of the second part to which the cam piece is to be attached, while the edge of the opening is is received in the groove and a lug is provided on the flange which can engage said ridge to prevent the cam piece from relative rotational movement with respect to the part with the cam surface at the distal end of the socket is located. 009833 / UOi /;