as shown in fig1 an air pump 1 , according to an embodiment of this invention has a pump body ( 10 ) and a band ( 14 ). the pump body ( 10 ) comprises stiff ends ( 11 ), ( 12 ) and flexible sides ( 13 ). the band ( 14 ) is attached to the end ( 11 ) of the pump body ( 10 ). an air inlet ( 15 ) is provided on the end ( 11 ) while an air outlet ( 16 ) is provided on the other end ( 12 ). also referring to fig2 a , two check valves ( 17 ), ( 18 ) are respectively provided in the air inlet ( 15 ) and outlet ( 16 ). to operate the air pump ( 1 ), the user puts his hand or foot under the band ( 14 ) and depresses the end ( 11 ) of the pump body ( 10 ). as shown in fig2 a , the check valve ( 17 ) is closed but the check valve ( 18 ) is opened to discharge the air ( 100 ) in the pump body ( 10 ). then , the user raises his hand or foot to lift up the end ( 11 ) of the pump body ( 10 by pulling the band ( 14 ). as shown in fig2 b , the check valve ( 18 ) is closed and the check valve ( 17 ) is opened to suck outside air ( 200 ) into the pump body ( 10 ). by repeating the above operations , the air pump ( 1 ) can continuously supply air . fig3 a and 3b show a first application example of this invention , in which an air pump ( 23 ) is mounted in an air mattress ( 2 ) having a top surface ( 21 ) and a bottom surface ( 22 ). the user lies on the beautiful top surface ( 21 ) to enjoy the sunshine . also referring to fig3 c , the air pump ( 23 ) has a pump body ( 230 ), a band ( 231 ) and a heavy sand ring ( 236 ). the sand ring ( 236 ) is movably provided around the pump body ( 23 )), while the band ( 231 ) is attached to the end ( 237 ) of the pump body ( 230 ). the pump body ( 230 ) is flexible but has two stiff rings ( 232 ), ( 235 ) fixed on its ends ( 237 ), ( 238 ). also , a check valve ( 233 ) is provided on its end ( 237 ) while another check valve ( 234 ) is provided on its sides ( 239 ). fig3 d is a sectional view of the air pump ( 23 ) in the air mattress ( 2 ), wherein the top and bottom surfaces ( 21 ), ( 22 ) of the air mattress ( 2 ) are used as the ends ( 238 ), ( 237 ) of the air pump ( 23 ) to save material . before pumping air into the air mattress ( 2 ), the user reverses the air mattresses ( 2 ), as shown in fig3 b , so that the bottom surface ( 22 ) or the air mattress ( 2 ) is up , and the heavy sand ring ( 236 ) lies on the top surface ( 21 ). then , the user pulls the band ( 231 ) to lift up the end ( 237 ). the sand ring ( 236 ), lying on the top surface ( 21 ), resists the pull so that the pump body ( 230 ) can be expanded and the outside air ( 200 ) is sucked into the pump body ( 230 ) through the check valve ( 233 ). then , he depresses the end ( 237 ) of the air pump ( 23 ) to push the air ( 100 ), through the check valve ( 234 ), into the air mattress ( 2 ), and the pump body ( 230 ) is flattened . the air mattress ( 2 ) can be filled with air by repeating the above operations . then , the user upturns the top surface ( 21 ) of the air mattress ( 2 ). the sand ring ( 236 ) falls down to the bottom surface ( 22 ) so that the bottom surface ( 22 ), rather than the top surface ( 21 ), suffers from its weight . thus , the beautiful top surface ( 21 ) remains smooth . fig4 a and 4b show a second application example of this invention , wherein an air pump ( 35 ) is mounted in an inflatable boat ( 3 ). the air pump ( 35 ) has a pump body ( 350 ), a band ( 351 ) and a heavy weight ( 356 ), wherein the heavy weight ( 356 ) is firmly attached to the lower end ( 358 ) of the pump body ( 350 ). when the user pulls the band ( 351 ) to lift up the upper end ( 357 ) of the pump body ( 350 ), the heavy weight ( 356 ) resists the pull so that the pump body ( 350 ) can be expanded and the outside air ( 200 ) is sucked into the pump body ( 350 ) through a check valve ( 353 ) provided on the upper end ( 357 ). reference numbers ( 352 ) and ( 355 ) are two stiff rings fixed on the upper end ( 357 ) and lower end ( 358 ) of the pump body ( 350 ). reference number ( 354 ) is another check valve provided on the pump body ( 350 ) for allowing the air ( 100 ) to flow into the inflatable boat ( 3 ). it is understood that the heavy weight ( 356 ) can be movably provided between the upper end ( 357 ) and the lower end ( 368 ) to function the same . fig5 a and 5b show a third application example of this invention , wherein an air pump ( 59 ) is mounted in a swimming ring ( 5 ). the air pump ( 59 ) has two bands ( 591 ), ( 591 ′) attached to its opposite ends ( 597 ), ( 598 ). the user can expand the air pump ( 59 ) to suck outside air ( 200 ) into the pump body ( 590 ) by pulling the two bands ( 591 ), ( 591 ′) in opposite directions . reference numbers ( 592 ) and ( 595 ) are two stiff rings fixed on the upper end ( 597 ) and lower end ( 598 ) of the pump body ( 59 o ). reference numbers ( 593 ) and ( 594 ) are two check valves provided on the pump body ( 590 ). fig6 a , 6 b and 6 c show a fourth application example of this invention , wherein an air pump ( 61 ) is mounted in an umbrella ( 6 ). the umbrella ( 6 ) has an inflatable shaft ( 63 ), gores ( 64 ) and inflatable ribs ( 62 ) communicating the shaft ( 63 ). the air pump ( 61 ) is mounted on the bottom of the inflatable shaft ( 63 ) to push outside air ( 200 ) into the inflatable shaft ( 63 ) and further into the inflatable ribs ( 62 ). the inflatable shaft and ribs ( 62 ), ( 63 ) thus get stiff to support the gores ( 64 ). the air pump ( 61 ) has flexible sides ( 610 ) and two stiff ends ( 611 ), ( 612 ) which are in the shape of a bowl ( or in any proper shape ). a check valve ( 617 ) and a back - flow hole ( 614 ) are provided in the bowl - shaped end ( 611 ) while an air outlet ( 615 ) is provided on the same end ( 611 ). also , an air inlet are provided on the other end ( 612 ), where another check valve ( 618 ) and a valve cap ( 613 ) are mounted . the user holds the two stiff ends ( 611 ), ( 612 ) and compresses the pump body to pump air ( 100 ), through the check valve ( 617 ) and the air outlet ( 615 ), into the inflatable shaft ( 63 ) and ribs ( 62 ). the pump body is flattened . then , the user pulls the two stiff ends ( 611 ), ( 612 ) in opposite directions to restore the shape of the air pump ( 61 ). a small quantity of air ( 700 ) in the inflatable umbrella ( 6 ) can flow back to the pump body through the hole ( 614 ). therefore , the whole inflatable shaft ( 63 ) including the air pump ( 61 ) can be filled with air after the pumping operations are finished . then , the user closes the valve cap ( 613 ) to prevent air from leaking out . if the user intends to stow the umbrella ( 6 ), he opens an air - discharging valve ( 65 ) provided thereon to discharge the air therein . fig7 a , 7 b and 7 c show a fifth application example of this invention , wherein an air pump ( 46 ) is mounted in an inflatable sofa ( 4 ). the air pump ( 46 ) has a pump body ( 41 ) and a pulling ring ( 40 ). the pump body ( 41 ) comprises stiff ends ( 411 ), ( 412 ) and flexible sides ( 410 ). the pulling ring ( 40 ) is attached to the end ( 411 ) of the pump body ( 41 ). the end ( 412 ) of the pump body ( 41 ) is in the shape of a bowl , on which a tapered sleeve ( 415 ) is formed . a tapered portion ( 414 ) is formed on the other end ( 411 ) of the pump body ( 41 ) and can be exactly fitted into the tapered sleeve ( 415 ) to ensure an air tightness while the air pump ( 46 ) is not in use , as shown in fig7 c . also , two check valves ( 417 ), ( 418 ) are respectively provided at the ends ( 411 ), ( 412 ) of the pump body ( 41 ) in order to control air to flow in a single direction . to operate the air pump ( 46 ), the user puts his finger into the ring ( 40 ) and pulls the end ( 411 ) of the pump body ( 41 ) to suck outside air ( 200 ) into the pump body ( 41 ) through the check valve ( 417 ). then , he pumps the air ( 100 ) in the pump body ( 41 ) into the inflatable sofa ( 4 ) through the other check valve ( 418 ). fig8 shows a sixth application example of this invention , wherein an air pump ( 75 ) is mounted in an inflatable product ( 7 ). the pump body ( 758 ) of the air pump ( 75 ) consists of a closed air bag ( 758 ). that is , an air chamber ( 7588 ) is surrounded by the air bag ( 758 ). the inside of the air bag ( 758 ) is divided into a first air cell ( 7581 ) and a second air cell ( 7582 ), and an opening ( 7583 ) is provided therebetween . also , an air channel ( 757 ) is provided through the second air cell ( 7582 ) between the inflatable product ( 7 ) and the air chamber ( 7588 ). reference numbers ( 753 ) and ( 754 ) are check valves . reference numbers ( 752 ) and ( 755 ) are stiff rings . reference number ( 759 ) is an inflation valve . to operate the air pump ( 75 ), the user opens and pulls the inflation valve ( 759 ) up and allows outside air to flow into the first air cell ( 7581 ) and second air cell ( 7582 ), but not full , and then closes the inflation valve ( 759 ). also , some outside air automatically enters the air chamber ( 7568 ) through the check valve ( 753 ). then , the user depresses the top end ( 751 ) of the air pump ( 75 ), so that some of the air ( 300 ) in the first air cell ( 7581 ) flows into the second air cell ( 7582 ), and the air ( 400 ) in the air chamber ( 7588 ) flows into the inflatable product ( 7 ) through the air channel ( 757 ). then , he removes the depressing force . some air in the second air cell ( 7582 ) automatically flows back to the first air cell ( 7581 ) so that the pump body ( 758 ) is restored . also , outside air flows into the air chamber ( 7588 ) through the check valve ( 753 ) again . repeating the above operations , the user can quickly pump enough outside air into the inflatable product ( 7 ). although this invention has been described in its preferred forms and various examples with a certain degree of particularity , it is understood that the present disclosure of the preferred forms and the various examples can be modified regarding the details of construction . the scope of the invention should be determined by the appended claims and not by the specific examples given herein .
an air pump comprises a hollow pump body , at least one pulling member , an air inlet and an air outlet . the hollow pump body has air inside and consist of flexible sides and two opposite stiff ends . the air outlet is provided on the pump body to discharge the air in the pump body when the pump body is pressed . the pulling member is attached to one of the stiff ends of the pump body in order to restore the pressed pump body by pulling the pulling member . the air inlet is provided on the pump body to suck outside air into the pump body when the stiff end is pulled by the pulling member to restore the shape of the pressed pump body .