a first embodiment of a goods display hook according to the present invention is described below referring to fig1 - 5 of the accompanying drawings . a goods display hook 1 shown in fig1 comprises a main body 3 and a goods hanging arm ( hereinafter referred to as “ arm ”) 4 . the arm 4 has a goods hanging section 41 , a free end 41 ′ of which is slightly bent upward to prevent goods from dropping off and has an led lamp 5 at a tip thereof . the main body 3 is adapted to engage with a crossrail 2 drawn by a double - dotted imaginary line in the formed of a rectangular pipe which is assembled in a goods display furniture ( not shown ). as shown in fig3 , the main body 3 includes a bar holding section 30 which is comprised of a base plate 31 positioned on the top surface 21 of the crossrail 2 and front and rear hanging walls 32 and 32 ′ extending downwardly along the front and rear surface 22 , 23 of the crossrail 2 from the front and rear end of the base plate 31 . the crossrail 2 is held in a space 33 defined by the base plate 31 , front and real hanging walls 32 , 32 ′ of the bar holding section 30 of the main body 3 . as shown in fig3 , an arm supporting section 6 is formed above the bar holding section 30 of the main body 3 . the arm supporting section 6 comprises a pair of upright side walls 61 , 61 which are upwardly extending from the top surface of the base plate 31 of the bar holding section 30 to define a space 66 being open toward the top , front and back . a shaft 7 is connected between the upright walls 61 , 61 . a base end section 42 of the arm 4 is housed in the open space 66 and pivotally connected to the side walls 61 , 61 through the shaft 7 ( see fig1 ). the arm supporting section 6 further has an upright front short wall 34 serving as a stopper against the downward pivotal movement of the arm about the shaft 7 . when goods are hung on the goods hanging section 41 of the arm 4 , the arm 4 is held substantially in a horizontal position while resting on the upper end of the short wail 34 , and prevented from tilting down . a recess 36 is formed on the surface of the base plate 31 adjacent to the short wall 34 . the recess 36 and the short wall 34 define the housing of a coil spring 8 . the coil spring 8 is provided beneath the arm 4 at a position between a portion pivotally connected by the shaft 7 to the arm supporting section 6 of the main body 3 and the goods hanging section 41 of the arm 4 for urging to the arm 4 such that the goods hanging section 41 pivotally moves upwardly about the shaft 7 . other types of spring elements such as a flat spring may be used instead of the coil spring 8 . as shown in fig1 to 3 , a micro switch 9 is fixed to one of the side walls 61 at a position above the base end section 42 of the arm 4 . a switch button 92 projects the underside of a housing 91 of the micro switch 9 . a switch lever 93 having one end connected to the underside of the housing 91 and the other end 931 freely extending toward and coming into contact with the upper surface of an end 422 of the base end section 42 of the arm 4 which is on the opposite side of the shaft 7 to the goods hanging section 41 . the micro switch 9 is provided on the top surface of the housing 91 with electric terminals 94 which are connected through lead lines not shown to a terminal of the led lamp 5 attached to the free end 41 ′ of the goods hanging section 41 of the arm 4 and to a terminal of a battery 10 ′ described later ( see fig5 ). the embodiment described has the micro switch 9 disposed above the arm 4 on one side of the shaft 7 and the coil spring 8 disposed below the arm 4 on the other side of the shaft . the mounting layout of these elements will however not be restricted to this arrangement . the positions of the micro switch 9 and the coil spring 8 may be reversed with respect to the arm 4 and / or shaft 7 , or both the micro switch 9 and the coil spring 8 may be arranged on the same side with respect to the arm 4 and / or shaft 7 . the main body 3 is provided on the outer surface of the rear hanging wall 32 ′ with a power source box 10 containing a battery 10 ′. the power source box 10 has a terminal of the battery 10 ′ ( not shown ) on the upper surface thereof . a power switch 11 is disposed on the top surface of the power source box 10 and has a terminal ( not shown ) at the underside of its housing for electrical connection with the terminal of the battery 10 ′ and the terminal 94 of the micro switch 9 . in this embodiment , the main body 3 has the bar holding section 30 engageable with the crossrail 2 of the goods display hook and the upright side walls 61 , 61 constituting the arm supporting section 6 is made of synthetic resin and formed integrally with the bar holding section 30 of the main body 3 . however , the bar holding section 30 may be designed to be engageable with a horizontally extending material in the form of a bar , rod or wire other than the crossrail . likely , the arm supporting section 6 may be made of metal and may be formed separately from the bar holding section 30 of the main body 3 . further , in the embodiment described above , an led lamp is used for excellence in illuminance , a little power consumption , long service life as a light source , but other type of lamp including fluorescent lamp may be used . lamps with different colors including red , blue , yellow and green may be used for the goods display hooks according to the present invention to classify the goods to be hung on the hook by the different colors . this would help salespersons to find sold - out goods easily by glancing at the color of the lamp associated with the sold - out goods . then , a typical example of operation of the first embodiment according to the present invention will be explained referring to fig3 , 4 and 5 . in the state as shown in fig3 where goods 12 are hung on the arm 4 , the goods hanging section 41 of the arm 4 keeps a horizontal position while resting on the top surface of the short upright wall 34 serving as a stopper against the load of the goods 12 overcoming the resilient force of the coil spring 8 . in this state , the end 422 of the base end section 42 of the arm 4 contacts and presses the free end 931 of the switch lever 93 upward which in turn presses the switch button 92 at the intermediate portion of the lever . as apparent from the above , the button 92 and the lever 93 constitute an operating means of the micro switch 9 while the end 422 of the base end section 42 serves as an actuating means acting on the operating means of the micro switch 9 . fig5 shows an electric circuit of the goods display hook 1 in the state as shown in fig3 where goods 12 are hung on the goods hanging portion 41 of the arm 4 and the switch button 92 is pressed . in this state , as apparent from fig5 , the micro switch 9 is kept off . accordingly , as long as goods 12 are hung on the goods hanging section 41 and the switch button 92 is pressed , the micro switch 9 is not actuated even though the power source switch 11 is on , to thereby prevent the voltage of the battery 10 ′ from being applied to the led lamp 5 which is kept turned off . by changing the positional relationship between the micro switch 9 and the arm 4 , the electric circuit may be configured such that the micro switch 9 is actuated when the arm 4 is released from a load of goods hung thereon . fig4 shows the goods display hook 1 in the state where goods 12 are all removed from the goods hanging section 41 and there is no load on the arm 4 . the coil spring 8 pushes up the portion of the arm 4 between the pivoted portion 423 by the shaft 7 and the goods hanging section 41 , thereby pivotally moving the goods hanging section 41 of the arm 4 upward , in the counterclockwise direction b in the figure . at this time , since the opposite end 422 of the arm 4 is moved downward to release the force applied to the free end 931 of the lever 93 which in turn releases the pressure on the switch button 92 . in the state as shown in fig4 , the electric circuit is configured so as to turn on the micro switch 9 . if the power switch 11 is on , the voltage of the battery 10 ′ is applied to the led lamp 5 to turn on the lamp . since the lit led lamp 5 associated with the goods display hook having no goods hung on the arm can be easily found among many goods display hooks arranged on the display furniture , it is possible to replenish the hook with goods as soon as and just after the goods have been sold - out . the led lamp 5 can be set to remain lit unless the hook is replenish with goods for smooth replenishment . in the case where there is no stock for missing goods , the power source switch can be switched off to prevent power distribution to the led lamp 5 until replenishment with goods becomes possible . when the goods are delivered , switching on the power supply switch 11 and hanging the goods on the arm 4 presses the switch button 92 to prevent power distribution to the led lamp 5 , thereby turning off the led lamp 5 . a second embodiment of a goods display hook according to the present invention is described , referring to fig6 , in which a weight is used instead of the spring element 8 of the first embodiment . fig6 shows a cross - section view in the state where the hook is empty . in the second embodiment , a weight 8 ′ is attached to the lower surface of the base end section 42 of the arm 4 including an end 422 ′. the weight 8 ′ is formed separately from the base end section 42 of the embodiment , but it may be formed integrally with the arm , and may be made of metal or synthetic resin . an operation of the second embodiment of a goods display hook according to the present invention is described herein after almost the same as the first embodiment . namely , as shown in fig6 , there is no load of the goods 12 applied to the goods hanging section 41 of the arm 4 . the end 422 ′ of the base end section 42 of the arm 4 tilts down by the load of the weight 8 ′. this movement of the arm 4 releases the force applied to the free end 931 of the switch lever 93 which in turn releases the pressure applied to the switch button 92 , thereby actuating the micro switch 9 to turn on the led lamp 5 . the operation of the second embodiment in the state where goods 12 are hung on the hanging section 41 of the arm 4 is the same as that of the first embodiment and therefore omitted .
a goods display hook which enables salespersons to quickly and easily get information on the empty state of the goods display hooks . in a goods display hook comprising a main body engageable with a horizontally extending bar assembled in a goods display furniture and an arm including a base end supported by the main body and a goods hanging section extending from the base end section , the goods display hook further comprises a bias means for urging the arm in the direction that the goods hanging section tilts upwardly , the goods hanging section of the arm having a lamp at a free end thereof , the main body having a power source for the lamp , a switch device for the lamp and a shaft providing the arm with a pivotal movement , wherein the switch device is actuated by the arm to turn on the lamp when all the goods hung on the arm are removed which causes a pivotal movement of the arm in the direction that the goods hanging section tilts upwardly by the action of the bias means .