fig1 shows , as stated above an embodiment of , the fixing device , hereafter in the specification referred to as the clamp , in perspective , and comprising a jaw 1 in the form of a housing with two side walls 1b , 1c which face one another and two walls having a clamp opening 1a which in fig1 are shown in the form of a front wall 1e and a back wall 1d , these walls together forming a housing which in these figure is open in the upwards and downwards direction . the jaw 1 , at its lowermost part in fig1 is provided with attaching members 6 , 7 for interaction with complementary attaching members in the underlying support structure , such as elongate apertures 13 in a cableway / cable riser 14 . the attaching members 6 , 7 will be discussed in more detail hereinbelow . a closure means 2 , 3 comprises a ratchet arm 3 pivotally mounted at one end 3a to one of the sides of the clamp opening 1a near its mouth . the second end / engaging end 3b of the ratchet arm 3 is designed for snap engagement with a locking member 2 of complementary configuration at the opposite side of the clamp opening 1a for pressing a conduit r into the clamp opening 1a and retaining it therein see fig6 and 7 ). the locking member 2 is arranged so as to be resiliently tensioned in the direction of the clamp opening 1a for resilient abutment against the engaging end 3b of the ratchet arm 3 when in its inwardly pivoted active position , as shown in fig6 and 7d and e . the locking member 2 and the engaging end 3b of the ratchet arm 3 , in the illustrated embodiment , are designed with a plurality of projections / teeth 2a , 3c for engagement with one another in the desired position , dependent upon the outer dimension of the conduit r , as is shown clearly in fig2 and 6 . to guide the locking member 2 in its resilient movement towards the engaging end 3b of the ratchet arm 3 , the locking member 2 , which in the present embodiment and as shown in fig4 has the form of a curved body having teeth 2a on its concave side , is equipped with two parallel , elongate guiding slots 2b , spaced apart from one another in the side surfaces of the locking member 2 , which are through - going and are designed to interact with two guiding pins 8 secured in the front wall 1e and the back wall 1d of the jaw 1 . the guiding pins 8 and the guiding slots 2b are positioned and oriented in such a way that by means of a locking spring 4 in the form of a bent laminated spring attached to one side wall 1c and the jaw 1 and to the locking member , respectively , the locking member can be moved / pressed in the direction towards the engaging end 3b of the ratchet arm 3 in its inwardly pivoted closure position ( see fig4 and 6 ). the aforementioned attaching members 6 , 7 of the conduit jaw are arranged on the side 1b of the jaw 1 opposite the mouth of the clamp opening 1a and comprise projecting hooks 6 , 7 with hook openings 6a , 7a facing either towards and or away from one another for engagement with complementary attaching members in the underlying support structure , for example edges in elongate apertures 13 in the cableway / cable riser 14 as shown in fig6 a - 7d . when the hook openings 6a , 7a face away from one another and and are secured either end of the side of the jaw 1 opposite the mouth of the clamp opening 1a , ie , in fig6 and 7a - 7d the lowermost open side edge of the jaw 1 , the hooks 6 , 7 of the clamp can be thrust down into the elongate apertures 13 in the cableway with the clamp slightly askew in relation to the apertures 13 , whereafter the clamp can be rotated into a position at right angles to the elongate apertures 13 so that the hooks 6 , 7 engage with the underside of the edges of the aperture 13 . a more expedient design is however shown in the drawings , wherein one hook 6 is provided so as to be resiliently movable so that the clamp can be both mounted onto and dismounted from the attaching members in the underlying support structure , such as the elongate apertures 13 . such resilient mobility of the hook 6 is obtained in that the hook 6 with a stem 5 consisting of spring steel is secured by the end facing away from the hook 6 to the inside of one of the side walls 1b of the jaw 1 . providing that the hook 6 with the stem 5 lies resiliently in abutment against the inside of the side wall 1b , the clamp can be mounted in the elongate apertures 13 in that the resilient hook 6 is inserted into the elongate slot 13 , whereafter the clamp is displaced with the stem 5 of the hook towards the edge of the slot , whereupon the hook 7 at the other end of the clamp is inserted into a parallel slot 13 and in under the edge thereof while the resilient hook 6 springs back into position . when using this method of attachment , the clamp can , however , be released unintentionally in that force is exerted upon the clamp which displaces it towards the spring tension of the hook 6 in such a way that the fixed hook 7 can be forced up out of the aperture 13 . in order to prevent this , the clamp is equipped with a lock 10 for the hook 6 , comprising an eccentric member 11 with operating arm 12 , mounted on the jaw 1 . the eccentric member 11 can be turned by means of operating arm 12 from the passive position where the hook 6 with stem 5 lies in the withdrawn position as shown in fig5 . this will happen provided that the stem 5 of the hook 6 is bent away from the inside of the side wall 1b of the jaw 1 . by pivoting the operating arm 12 downwards , the eccentric member 11 is rotated and presses the stem 5 of the hook 6 in towards the the inside of the side wall 1b , whereupon the hook 6 is swung outwards and into engagement under the side edge of the aperture 13 . thus , the clamp will not be capable of being moved sideways by the pressure of any force and will be securely held against the support structure . the mounting of the clamp on the cableway and the positioning of the conduit in the clamp is clearly shown in fig7 a , b , c , d and e . the clamp is secured by means of the hooks 6 , 7 in the aforementioned elongate apertures 13 in the cableway / cable riser 14 , whereupon the operating arm 12 is pivoted downwards so that the movable hook 6 is displaced in under the edge of the aperture 13 , whereby the clamp is securely fixed to the cableway as shown in fig7 b . the conduit r is placed thereafter in the opening of the clamp 1a as shown in fig7 c and the ratchet arm 3 is pivoted downwards so that its engaging end 3b , that is provided with teeth 3c , enters into engagement with the locking member 2 , as is shown in fig7 d . the clamp can receive and retain the conduit r of varying dimensions in that the ratchet arm 3 is depressed to a lesser or greater extent , depending upon the dimensions of the conduit , into engagement with the locking member 2 , as is shown in fig6 . as shown in fig7 e , an additional clamp can be placed on top of the clamp that is secured to the cableway 14 . the same attaching members 6 , 7 are used here in interaction with holes 9 in each of oppositely positioned side walls 1b , 1c of the jaw . the jaw 1 can be made , for instance , in such a way that a blank is punched out which comprises the front wall 1e , the back wall 1d with the intermediate side wall 1b . the blank is bent upwards so that the front wall , back wall and one side wall are formed . the second side wall 1c can be produced separately , as shown in fig8 and affixed in the open side edge of the upwardly bent blank in a known way , per se . the side wall element 1c is , as shown in fig8 equipped with the hook 6 at its lowermost end and with the hole 9 at its uppermost end . instead of making the jaw 1 as a housing with a front wall , a back wall 1e , 1d and two side walls 1b , 1c , the jaw can consist of a plate ( not shown ) having a clamp opening 1a and with the aforementioned elements such as the ratchet arm 3 and the locking member 2 positioned on the plate . the same applies also to the attaching members 6 , 7 for securing the clamp to the support structure . instead of a resilient locking member 2 , the engaging portion of the ratchet arm 3 can be arranged resiliently so that upon pivoting down towards the fixed locking member 2 , the engaging end 3b will give way to , for example , a telescopic device on the ratchet arm 3 such that the engaging end 3b is pressed to abutment against the locking member 2 having teeth 2a . an alternative embodiment of the locking member 2 may be that it is made of a punched - out portion of one side wall 1c of the jaw 1 , as is shown in fig9 . the punched - out portion here has been pivoted inwards in the jaw or the housing formed thereby in order to interact with the ratchet arm 3 . the desired resilience arises in that the locking member 2 acts as a resilient arm attached to the side wall 1c . the parts are preferably made of stainless steel , thereby also having resilient properties . in an alternative embodiment of the clamp as shown in fig1 to 16b , the two oppositely positioned side parts of the clamp opening 1a are made of two jaw portions 1 &# 39 ;, 1 &# 34 ; that are rotatable relative to one another with the point of rotation a at the lower edge of the clamp opening 1a . this means that the jaw 1 consists of two jaw portions 1 &# 39 ;, 1 &# 34 ; that are rotatable relative to one another . upon relative rotation of the jaw portions 1 &# 39 ;, 1 &# 34 ;, the distance between the attaching members 6 , 7 is altered such that these can be inserted into the apertures 13 in the cableway / cable riser 14 in order thereafter to cause engagement between the hook - shaped attaching members 6 , 7 and the edges of the apertures 13 by rotating the jaw portions 1 &# 39 ;, 1 &# 34 ; back into the operative position . the jaw portions 1 &# 39 ;, 1 &# 34 ; can he retained in the operative position by means of the clamping members of the clamp , viz , the ratchet arm 3 and the locking member 2 which , when in engagement with one another , press the jaw portions 1 &# 39 ;, 1 &# 34 ; towards and away from one another , respectively , in order to hold the hook - shaped attaching members 6 , 7 in engagement with the edges of the apertures 13 . as shown in fig1 , 11 and 12a - 12d , the hook openings 6a , 7a of the hook - shaped attaching members 6 , 7 face away from one another . in this case , the jaw portions 1 &# 39 ;, 1 &# 34 ; will be rotated apart from one another to reduce the distance between the attaching members 6 , 7 for insertion into the apertures 13 . thereafter the law portions 1 &# 39 ;, 1 &# 34 ; are rotated once more towards one another whereby the hook openings of the attaching members 6 , 7 are brought to abutment and engagement with the edges of the apertures 13 . in another embodiment of the attaching members 6 , 7 , the hook openings thereof can face towards one another as is shown in fig1 and 14a - 14c . on mounting the clamp on the support structure , the jaw portions 1 &# 39 ;, 1 &# 34 ; must be rotated towards one another in order to increase the distance between the attaching members 6 , 7 , whereupon these members are inserted into the apertures 13 , whereafter the jaw portions 1 &# 39 ;, 1 &# 34 ; are rotated back to the operative position whereby the hook openings 6a , 7a of the attaching members 6 , 7 are brought into engagement with the side edges of the apertures 13 . here , the jaw portions 1 &# 39 ;, 1 &# 34 ; can also be held in the operative position by means of the ratchet arm 3 and the locking member 2 in that the ratchet arm 3 is brought into engagement with the locking member 2 and presses the jaw portions 1 &# 39 ;, 1 &# 34 ; apart from one another . as shown in fig1 a - 12d and fig1 a - 14c , respectively , and also in fig1 , the clamping members are made of complementary closure members 15 , 16 provided on each jaw portion 1 &# 39 ;, 1 &# 34 ;. the complementary closure members 15 , 16 can , as shown in fig1 a - 12d and fig1 a - 14c , be made of a projection / tongue 15 on the first jaw portion 1 &# 39 ; and an indentation / aperture 16 on the second jaw portion 1 &# 34 ;, or vice versa . thus , in fig1 a - 12d , the tongue 15 of the closure member is made of a resilient projection / laminate spring attached to the side wall of the jaw portion 1 &# 39 ; and which in the closed position engages with an indentation 16 in the second jaw portion 1 &# 34 ;. the indentation is positioned on the end of the jaw portion 1 &# 34 ; which extends from the point of rotation a towards the side edge of the first jaw portion 1 &# 39 ;. thus , the jaw portions 1 &# 39 ;, 1 &# 34 ; are prevented from rotating back and becoming disengaged from the apertures 13 . an alternative embodiment of the closure members 15 , 16 is shown in fig1 a - 14c and in more detail in fig1 . the projection / tongue 15 of the closure member is here positioned on the side wall of the jaw portion 1 &# 39 ; and projects inwards in order to interact with an indentation / aperture 16 on the second jaw portion 1 &# 34 ;. the indentation / aperture 16 is placed in the same area as mentioned above in connection with the embodiment in fig1 . as shown in the enlarged detailed drawings in fig1 a , b and c , the part of the jaw portion 1 &# 34 ; near the indentation / aperture 16 is furnished with a pocket 17 with an upwardly facing opening designed for the insertion of , for example , a screw driver 18 . by turning the screw driver , the side wall of the jaw portion 1 &# 34 ; is pressed so that the indentation / aperture 16 disengages from the tongue 15 of the projection / tongue 15 of the first jaw portion 1 &# 39 ;, whereby the jaw portions 1 &# 39 ;, 1 &# 34 ; can rotate freely relative to one another , thereby causing the attaching members 6 , 7 of the clamp to disengage from the edges of the apertures 13 when dismounting the clamp . in the alternative embodiment of the clamp according to fig1 , 11 , 12a - 12d , 13 , 14a - 14c and 15 , the locking member 2 in the jaw portion 1 &# 34 ; is made of two parallel arcuate rows of teeth 2a &# 39 ; spaced relative to one another , each affixed to one of the facing side walls of the jaw portion 1 &# 34 ; for engagement with the engaging end 3b of the ratchet arm 3 . rotation of the jaw portions 1 &# 39 ;, 1 &# 34 ; towards one another is achieved in that the engaging end 3b of the ratchet arm 3 projects in through the slot 2b formed by the rows of teeth 2a &# 39 ; for resilient engagement by means of the engaging members 3d provided on the engaging end with the back of the toothed rows 2a , ie , the sides which face away from the clamp opening 1a . the retention of the attaching members 6 , 7 in the cableway / cable riser 14 is thereby achieved at the same time as conduit r is held in the clamp as shown in fig1 c and 12d , in particular . in this case , the clamping members 15 , 16 may therefore be omitted . the teeth in the rows of teeth 2a &# 39 ; can be provided in that the side walls of the jaw portion 1 &# 34 ; are made of plates having a number of projections chat are bent inwards at an angle to the plate whereby the two rows of teeth 2a &# 39 ; are produced having an intermediate slot 2b . the resilient engagement of the ratchet arm 3 with the rows of teeth 2a &# 39 ; can be achieved , for example , in that the ratchet arm 3 is made of a resilient material which brings the engaging members 3d of the engaging end 3b into pressured abutment against the back of the rows of teeth 2a . optionally , the engaging member itself 3d can be made of a resilient material in order to achieve the above described effect . the jaw 1 , the jaw halves 1 &# 39 ;, 1 &# 34 ;, respectively , have at their side edges on each side of the mouth of the clamp opening 1a a hole 9 for interaction with the aforementioned hook - shaped attaching members 6 , 7 on a corresponding clamp , for mounting clamps one on top of another , as shown in fig1 a . mounting the clamp in the hole 9 of the underlying clamp happens in the same way as described hereinabove in connection with both clamps having a non - divided jaw 1 and clamps wherein the jaw 1 comprises two jaw portions 1 &# 39 ;, 1 &# 34 ;, rotatable relative to one another . as also shown in the drawing , and particularly clearly in fig1 a , the axis of rotation a of the jaw portions 1 &# 39 ;, 1 &# 34 ; is laterally displaced from the bisectional plane b of the clamp opening 1a , see fig1 , and inwards above one of the jaw portions 1 &# 39 ;, 1 &# 34 ; . the point of rotation a is preferably displaced inwards above jaw component 1 &# 39 ; with ratchet arm 3 .