fig1 shows an example assembly 10 wherein an example bracket 12 according to the invention is used to secure an item 14 to a support 16 . in this example , the assembly 10 is a fire suppression sprinkler system comprising a riser 18 and a branch pipe 20 attached to a beam 22 of a structure , such as a warehouse , office building , hotel or other edifice . a saddle coupling 24 connects one end of a flexible hose 26 to the pipe 20 , the other end being attached to the item 14 , in this example a sprinkler reducer . sprinkler reducer 14 is connected to a heat triggered sprinkler 28 which projects through an opening 30 in a ceiling panel 32 . the weight of the flexible hose 26 , bracket 12 , reducer 14 and sprinkler 28 is borne on the support 16 , in this example a cross beam which extends between rails 36 to which the ceiling panel 32 is attached . in this example the ceiling panel is drywall construction , but other types of ceilings are also contemplated . use of the flexible hose 26 permits positional adjustment of the sprinkler 28 in two horizontal and one vertical direction , making it advantageous for use with drywall construction because it is very easy to align the sprinkler with the opening 30 . vertical positioning of the sprinkler is facilitated by the bracket 12 . an example bracket 12 is shown in detail in fig2 and comprises a base 38 , an arm 40 mounted on the base , a contact surface 42 mounted on the arm and a finger 44 mounted on the base . in this example , base 38 is formed of first and second plates 46 and 48 positioned in spaced apart relation to one another . plates 46 and 48 are attached to one another by a third plate 50 . together plates 46 , 48 and 50 form a channel 52 which in this example is sized to receive the support , cross beam 16 ( see fig1 ) to mount the bracket 12 onto it . alternately , the base 38 could be bolted or riveted to the cross beam or another support using one of the plates , however , receiving the cross beam 16 within channel 52 permits easy positional adjustment of the sprinkler 28 lengthwise along the beam . as shown in fig2 and 3 , base 38 has first and second side portions 54 and 56 in spaced relation to one another thereby defining an opening 58 ( fig3 ) which receives the item 14 to be mounted on support 16 . the side portions are connected by a transverse portion 60 , the opening 58 being positioned opposite to the transverse portion . fig2 and 3 illustrate the arm 40 . in this example , a first end 40 a of arm 40 is pivotally mounted on the first side portion 54 . arm 40 can pivot about an axis 62 between a closed position overlying opening 58 ( fig2 ), and an open position in spaced relation away from the opening ( fig3 ). there may be a spring element 64 acting between the base and the arm which biases the arm 40 into the closed position overlying the opening . contact surface 42 comprises a tab 66 in this example , the tab extending from a second end 40 b of the arm 40 disposed opposite to the first end 40 a . fig2 a illustrates the tab 66 and finger 44 in detail . in this example finger 44 comprises a threaded shaft 68 which threadedly engages the second base plate 48 on the second side portion 56 . shaft 68 has a longitudinal axis 70 and is movable in the direction of axis 70 transversely to the base 38 when rotated to permit the end 72 of the shaft 68 to move into and out of engagement with the contact surface 42 . shaft 68 may be a wing bolt to facilitate manual rotation , and / or it may have a non - round receptacle 74 , as shown in fig7 , to permit a tool 76 , such as a nut driver or hex head wrench , to be used for rotating the shaft 68 . in one example embodiment , shown in fig2 a , the tab 66 is angularly oriented with respect to the longitudinal axis 70 of the shaft 68 . angularly orienting tab 66 permits the force exerted by the shaft 68 on the second end of arm 40 b to be varied as necessary to clamp the item 14 between the arm 40 and the base 38 as shown in fig5 and 6 and described below . other tab configurations which achieve a clamping force between the arm and the base are also feasible . as shown in fig2 b , the tab 66 is aligned substantially parallel with the longitudinal axis 70 of the shaft 68 , and has a recess 78 which receives the end 72 of the shaft 68 and permits the arm 40 to be forced tightly into the closed first position as the shaft is rotated and driven along the recess and against the contact surface 42 . fig2 c shows a tab 66 having a beveled edge 80 for receiving and guiding the shaft into engagement with the contact surface 42 of the tab . in both of these embodiments it is advantageous if the tab 66 partially overlies the path of shaft 68 when the arm 40 is held in the closed position by the spring 64 so that when the shaft 68 engages the contact surface 42 of the tab 66 it applies force to the arm thereby allowing the arm to exert a clamping force on the item 14 positioned between it and the base 38 . fig2 d shows an exploded view of another bracket embodiment 82 wherein tab 66 comprises a curved surface 84 forming a hook 86 . hook 86 is sized to receive finger 44 when the arm 40 is in the closed configuration overlying opening 30 . curved surface 84 may have a conical shape , being wider at the end proximate to the position 88 on base 38 where the finger 44 engages the base , and narrowing distally therefrom . the conical shape helps guide the finger into engagement with the surface 84 by forming a lead - in to accept the end of the finger 44 . the conical shape also provides an effect similar to the angled contact surface 42 shown in fig2 a in that it permits the finger to force the arm 40 into the closed position as it rides up the surface 84 upon motion along axis 70 . as further shown in fig2 d , a hook 90 is mounted on the second end 40 b of arm 40 . hook 90 is sized to receive finger 44 and helps to properly position arm 40 in the closed position to permit effective engagement between the finger 44 and the curved surface 84 of tab 66 . fig4 shows an alternate bracket embodiment 92 wherein finger 44 is mounted on arm 40 , and the contact surface 42 is mounted on the base 38 , the other features of the bracket 82 being as described above for bracket 12 . in the example bracket 92 , finger 44 comprises a threaded shaft 68 threadedly engaged with the end 40 b of arm 40 . shaft 68 has a longitudinal axis 70 , and rotation of the shaft moves the finger transversely to the arm 40 in the direction of the axis 70 , allowing the shaft to engage and disengage with the contact surface 42 . contact surface 42 comprises a tab 66 mounted on the second plate 48 . as shown in fig4 a , tab 66 may be angularly oriented with respect to the longitudinal axis 70 of the shaft 68 . in another embodiment , shown in fig4 b , tab 66 is mounted on base 38 and comprises a recess 78 which receives and guides finger 44 ( shaft 68 ) into engagement with the contact surface 42 . finger 44 is mounted on arm 40 and movable along its longitudinal axis 70 as described above . fig4 c illustrates another embodiment wherein finger 44 is again mounted on arm 40 and tab 66 is mounted on base 38 , the tab having a beveled edge 80 to guide the finger into engagement with the contact surface 42 . fig4 d illustrates yet another embodiment wherein finger 44 is mounted on arm 40 and the tab 66 comprises a curved surface 84 forming a hook 86 mounted on the base 38 . hook 86 is sized to receive finger 44 when the arm 40 is in the closed configuration overlying opening 30 . curved surface 84 may have a conical shape , being wider at the end proximate to the end of the finger 44 , and narrowing distally therefrom . the conical shape helps guide the finger into engagement with the surface 84 by forming a lead - in to accept the end of the finger 44 . the conical shape also provides an effect similar to the angled contact surface 42 shown in fig2 a in that it permits the finger to force the arm 40 into the closed position as it rides up the surface 84 upon motion along axis 70 . operation of the bracket 12 according to the invention is illustrated in fig5 and 6 . in this example , before a ceiling panel 32 is installed , support 16 is received within channel 52 and the bracket 12 is able to slide lengthwise along the support so as to preposition it to align with opening 30 in the ceiling panel once it is installed . item 14 , in this example a sprinkler reducer attached to a piping network by a flexible hose 26 ( see also fig1 ), is inserted within bracket opening 58 ( fig5 ) and held in position by moving arm 40 ( or allowing the arm to move if spring biased ) from the open to the closed position ( fig6 ). with the arm 40 in the closed position , threaded shaft 68 is rotated to engage it with contact surface 42 and provide clamping force between the arm 40 and the bracket base 38 to clamp the reducer in an arbitrary vertical position . next the ceiling panel 32 is attached to its supporting structure ( see rails 36 in fig1 ), with the opening 30 aligned with the reducer 14 . after installation of the ceiling panel 32 , a technician may adjust the vertical position of the sprinkler 28 attached to the reducer 14 by turning the threaded shaft 68 to disengage it from the contact surface 42 , thereby allowing the arm 40 to swing from the closed to the open position ( fig5 ), or at least out of contact with the reducer 14 . the reducer , no longer being supported by bracket 12 , is free to move vertically as necessary to position the sprinkler 28 at the desired position relative to the ceiling panel 32 . the technician holds the reducer in the desired vertical position and moves , or allows , arm 40 to move back into the closed position ( fig6 ) where it engages the reducer . the technician then rotates the threaded shaft 68 to again engage it with the contact surface 42 , which results in clamping of the reducer between the arm 40 and the base 38 , thereby holding the sprinkler in the desired vertical position . brackets according to the invention allow easy adjustment of the position of an item on one side of a barrier or membrane where the mounting to be manipulated is positioned on the opposite side of the barrier or membrane and thereby provide significant advantage over prior art mounting brackets . although use of example brackets according to the invention is shown in the context of a fire suppression sprinkler system , it is understood that this is by way of example only and not a limitation . brackets according to the invention may be used with any type of support , in a ceiling , wall or other structure , and in any orientation , and may be used to secure electrical fixtures such as lighting , wiring harnesses , natural gas lines , audio components such as loudspeakers , as well as safety devices such as smoke detectors , carbon monoxide detectors , and radiation monitors to cite but a few examples .
a bracket positioned on one side of a membrane or surface is adjustable from the other side of the surface to permit the position of an item supported by the bracket to be readily adjusted relatively to the surface . the bracket has a base to which an arm is movably attached . the arm moves between an open and a closed position to permit the item to be received by the bracket . in the closed position the item is clamped between the base and the arm . a finger is mounted on the base and is movable into and out of engagement with a contact surface on the arm . when the finger engages the contact surface it secures the arm in the closed position and effects the clamping action which holds the item in position . the finger and arm are readily accessible to permit adjustment .