referring first to fig1 , there is shown means for containing and discarding pet litter 1 , including collapsible frame 2 which in its open configuration holds open a trash bag 3 of the conventional art , which in turn covers a litter box 4 of the conventional art . the article is shown in normal use , with the pet 6 exiting through the opening in the trash bag 3 . fig2 , 3 and 4 depict the collapsible frame 2 in its open , compressed , and closed configurations , respectively . in all three views there are rectangular frame members 10 and 11 , which interlock with each other via cooperative hinge means 14 and 15 , allowing them fully to pivot from the open configuration of fig2 to the compressed and closed configurations of fig3 and 4 . referring to the open configuration of fig2 , we see that the collapsible frame is held open by the action of an overhead frame member 12 and spring 13 , which together provide a holding force between the top of rectangular member 10 , and the top of rectangular frame member 11 . the spring 13 is held in its proper position by catch means 18 and 19 , which are integral parts of rectangular frame member 11 and overhead frame member 12 . referring to the compressed configuration of fig3 , we see that the spring 13 becomes extended , thereby providing a restoring force so that when the caregiver releases downward pressure on the frame , it returns to its open position as in fig2 . referring back to fig1 , we see that once compressed , the collapsible frame 2 may be removed from trash bag 3 . comparing the two views of fig3 and 4 , we see that by sliding the spring 13 away from its catches 18 and 19 and past either corner of rectangular frame member 11 , its stress is relieved and the entire assembly is allowed to collapse to a thin configuration for storage or shipping . referring again to fig1 , 2 , 3 and 4 , advantageous use of the invention is as follows : when the collapsible frame 2 is held in its compressed configuration as in fig3 , the caregiver may insert it into a trash bag of the conventional art , so that the overhead frame member 12 is on top , and the spring is toward the open end of the trash bag . once the collapsible frame 2 is inserted into the bag , the caregiver may then allow it to open by releasing force on the top and allowing the spring 13 to exert its restoring force and open frame 2 to the open configuration of fig1 and 2 . when the collapsible frame 2 is in its collapsed configuration as in fig4 , the caregiver may convert it into its open configuration by sliding the spring 13 until it engages the two catches 18 and 19 , thereby remaining in place to hold the entire structure open . with the collapsible frame 2 inside the bag 3 and in its open configuration as in fig1 and 2 , the caregiver may insert a litter box 4 of any convenient size and filled to a desired volume with litter 5 . we have found that domestic cats become accustomed to the enclosed structure very quickly , and that no extraordinary training or encouragement is required . during use by the pet or pets , our invention serves to hide the unsightly view of pet waste , helps prevent the dispersal of litter and pet waste about its surroundings , and retards the diffusion of odorous , airborne constituents that usually accompany pet waste . when it is time to discard the litter and pet waste , our invention exhibits another advantageous feature by allowing the caregiver to remove the waste without touching the materials or structures that have come in contact with it . referring to fig1 , the caregiver simply compresses the frame 2 allowing it to be removed from the bag . then the bag 3 containing the litter box 4 , and litter 5 with pet waste may be lifted up , closed , and discarded without touching anything contaminated by the pet waste . in the preferred embodiment , we find that a 30 - gallon trash bag ideally accommodates a collapsible frame that is approximately 14 × 14 × 18 ½ inches ( hwd ), and that a 33 - gallon trash bag suitably accommodates the same collapsible frame . in the preferred embodiment , detailed construction of the rectangular members is shown in fig5 , 6 and 7 . all three of the rectangular members may be constructed of steel wire of gage awg 9 , or of any convenient material which provides appropriate strength . referring first to fig5 , there is shown a first rectangular frame member 10 , shaped to include near the midpoint of each long side inner hinge elements 20 and 21 , to engage corresponding hinge members on the other rectangular member . the wire ends 22 near the midpoint of one short side may be joined after assembly by welding or other suitable means . referring to fig6 , there is shown a second rectangular frame member 11 , shaped to include near the midpoint of each long side outer hinge elements 25 and 26 , to engage the inner hinge elements 20 and 21 . it further incorporates near the midpoint of one short side catch means 18 , to engage spring means 13 of fig2 and 3 . the wire ends 27 near the midpoint of the other short side may be joined after assembly by welding or other suitable means . for the joints 22 and 27 , the preferred embodiment has used gas tungsten arc welding , or gtaw , commonly referred to as tungsten inert gas ( tig ) welding . the joints may be made in any suitable manner without departing from the definition and spirit of our invention . spring 13 is a conventional coil spring . although a substantial range of spring stiffness is feasible , we have selected in the preferred embodiment a spring constant of approximately 198 n / m ( 1 . 13 lb / in ) and a non - extended length of 8 . 26 cm ( 3 . 25 in ). further , the preferred embodiment places the joints 22 and 27 near the midpoint of a short side of each rectangular frame member . this is judged to be preferable to reduce torsional stress on the joint , and the joints may be placed at other locations without departing from the definition and spirit of our invention . further , the preferred embodiment places the joints 22 and 27 on the short side which , when assembled , will be at the rear of the entire assembly . this is judged to be preferable for both cosmetics and stress reduction , and the joints may be placed at other locations without departing from the definition and spirit of our invention . referring to fig7 , there is shown overhead frame member 12 , assuming a u - shape . it incorporates at its ends loops that form outer hinge elements 16 and 17 to engage the short side of rectangular frame member 10 of fig5 . it is further shaped to include near the midpoint of its short side catch means 19 , to engage spring means 13 of fig2 and 3 .
means for containing and handling pet litter , wherein a reusable , collapsible frame assembly is used cooperatively with a flexible trash bag to provide a structure for enclosing a litter container while in use , allowing the pet caregiver to dispose of the entire litter container without touching it . the reusable , collapsible frame assembly is designed to support the trash bag while in use , and to be partially or completely compressed for removal so that the litter , bag , and optionally the litter container can be disposed of together without requiring the animal caregiver to touch the contents .