This application claims priority of Taiwanese Patent Application No. 108109597, filed on Mar. 20, 2019.
The disclosure relates to an air pump inflating device, and more particularly to a hand air pump inflating device.
A conventional hand air pump inflator for a racing bicycle, such as that disclosed in CN 101737294, generally includes an inner tube which is fixed to a nozzle at a front end, and an outer tube which is sleeved around the inner tube and displaceable relative to the inner tube for pumping air to the nozzle. A user grips and holds the inner tube with one hand, and pulls and pushes the outer tube with the other hand relative to the inner tube. The movement of the outer tube is interfered by the hand gripping the inner tube, which results in inconvenience during operation, and which limits a forward stroke of the outer tube and an inflating efficiency of the inflator.
Therefore, an object of the disclosure is to provide a hand air pump inflating device that can alleviate at least one of the drawbacks of the prior art.
According to the disclosure, the hand air pump inflating device includes a nozzle and a cylinder mechanism. The nozzle has an inflating conduit formed therein. The cylinder mechanism includes a cylinder body, a tubular shaft, a tubular piston rod, a larger end cap, a smaller end cap, a front piston ring module, a rear piston ring module and a one-way check valve. The cylinder body extends in a longitudinal direction to terminate at opened front and rear cylinder ends. The front cylinder end is fixed to the nozzle. The tubular shaft is disposed within the cylinder body and extends in the longitudinal direction to terminate at opened front and rear shaft ends. The front shaft end is fixed to the nozzle and in air communication with the inflating conduit. The tubular piston rod is movably disposed within the cylinder body, surrounds the tubular shaft, and extends in the longitudinal direction to terminate at opened front and rear piston ends, such that the tubular piston rod is movable relative to the cylinder body and the tubular shaft in the longitudinal direction to reciprocate a rearward stroke and a forward stroke. The larger end cap is disposed on and encloses the rear piston end. The smaller end cap is disposed on and encloses the rear cylinder end and is sleeved on and in air-tight and movable engagement with the tubular piston rod. The front piston ring module is disposed on and encloses the front piston end, and has an outer ring portion which is in frictional engagement with the cylinder body to divide a space between the cylinder body and the piston rod into first and second chambers respectively close to the front and rear cylinder ends, and an inner ring portion which is sleeved on and in air-tight and movable engagement with the tubular shaft, such that the front piston ring module is moved with the tubular piston rod to interrupt air communication between the first and second chambers by the rearward stroke, and to permit the air communication between the first and second chambers by the forward stroke. The rear piston ring module is disposed on and encloses the rear shaft end, and is in movable and frictional engagement with the tubular piston rod to divide a space between the tubular piston rod and the tubular shaft into third and fourth chambers respectively close to the front and rear piston ends, such that the rear piston ring module is moved relative to the tubular piston rod to permit air communication between the third and fourth chambers by the rearward stroke, and to interrupt the air communication between the third and fourth chambers by the forward stroke. The check valve is disposed between the rear shaft end of the tubular shaft and the rear piston ring module to only permit passage of air from the fourth chamber to the tubular shaft. During the rearward stroke, a negative pressure is generated in the first chamber as a result of volume increment to introduce air thereinto, and air in the second chamber is pressed into the third chamber and the fourth chamber.
During the forward stroke, air in the first chamber is pressed to flow into the second chamber and the third chamber, a positive pressure is generated in the fourth chamber as a result of volume decrement to open the check valve, and air in the fourth chamber is pressed to flow into the tubular shaft.
Other features and advantages of the disclosure will become apparent in the following detailed description of the embodiment with reference to the accompanying drawings, of which:
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The cylinder mechanism 4 further includes a larger end cap 44 which is securely disposed on and encloses the rear piston end of the tubular piston rod 42, a tubular handgrip 45 which is securely connected with the larger end cap 44 and has a grip wall extending forwardly to surround the rear cylinder end of the cylinder body 41, a smaller end cap 46 which is securely disposed on and encloses the rear cylinder end of the cylinder body 41 and is sleeved on and in air-tight and movable engagement with the tubular piston rod 42, a front piston ring module 47 which is securely disposed on and encloses the front piston end of the tubular piston rod 42 and is interposed between the cylinder body 41 and the tubular shaft 43, a rear piston ring module 48 which is securely disposed on and encloses the rear shaft end of the tubular shaft 43 and is frictionally disposed within the tubular piston rod 42, and a one-way check valve 49 which is disposed between the rear shaft end of the tubular shaft 43 and the rear piston ring module 48.
Since the structures of the larger end cap 44 and the smaller end cap 46 may be varied and of a hitherto known type, a description thereof is dispensed with herein for the sake of brevity.
Specifically, the front piston ring module 47 has an outer ring portion which is in frictional engagement with the cylinder body 41 to divide a space between the cylinder body 41 and the piston rod 42 into first and second chambers 401, 402 respectively close to the front and rear cylinder ends of the cylinder body 41, and an inner ring portion which is sleeved on and in air-tight and movable engagement with the tubular shaft 43. The first chamber 401 is in air communication with the intake slot 321 for introducing air thereinto. In this embodiment, the front piston ring module 47 includes a front piston ring body 471 which is securely connected with the front piston end of the tubular piston rod 42, and which has an outer annular groove 472 formed in an outer surrounding surface thereof, and a plurality of notched passages 473 extending in the longitudinal direction to be in air communication with the outer annular groove 472 and the second chamber 402, a fixed seal ring 474 which is securely disposed on an inner surrounding surface of the front piston ring body 471 to serve as the inner ring portion, and a movable seal ring 475 which is received in the outer annular groove 472 to serve as the outer ring portion.
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During the manual operation of the inflating device 200, the nozzle 3 is coupled to an inflatable object. The user grips the front cylinder end of the cylinder body 41 with one hand, and the tubular handgrip 45 with the other hand to pull and push the tubular handgrip 45 and the tubular piston rod 42 relative to the cylinder body 41 so as to make rearward and forward strokes.
With reference to
Subsequently, the tubular handgrip 45 is pushed forward relative to the cylinder body 41 to retract the tubular piston rod 42 forward into the cylinder body 41, i.e., the cylinder mechanism 4 is retracted until the larger end cap 44 abuts against the smaller end cap 46, as shown in
With reference to
In this embodiment, the first chamber 401 in the cylinder body 41 is in air communication with the ambient air through the intake slot 321 formed in the outer surrounding surface of the cylinder coupling portion 32 of the nozzle 3 and defined by the fitting coupling of the cylinder coupling portion 32 with the front cylinder end of the cylinder body 41. Alternatively, the intake slot 321 may be recessed in the inner surrounding surface of the cylinder body 41. The intake slot 321 may be in the form of a penetrating hole formed through the cylinder body 41 to be in air communication with the first chamber 401. Moreover, the check valve 49 may be alternatively in other various forms.
Furthermore, the tubular handgrip 45 of this embodiment may be dispensed therewith. In such case, the tubular piston rod 42 may be formed to further project rearwardly to form as a handgrip portion. Hence, the manual operation of the tubular piston rod 42 is convenient to conduct without interfering by the hand gripping the nozzle 3 or the cylinder body 41.
As illustrated, with the cylinder body 41 secured to the nozzle 3 and the tubular shaft 43 disposed within the tubular piston rod 42 and secured to the nozzle 3, the tubular piston rod 42 is movable relative to the cylinder body 41 and the tubular shaft 43 to reciprocate rearward and forward strokes, and the hands of the user can individually grip the nozzle 3 or the cylinder body 41, and the rear piston end of the tubular piston rod 42 without interfering each other. Further, the tubular piston rod can be moved forward sufficiently to improve the inflating efficiency. The tubular handgrip 45 is disposed to render the manual operation more convenient.
Moreover, with the front and rear piston ring modules 47, 48 in the form of a one-way piston, during the rearward stroke of the tubular piston rod 42, air in the second and third chambers 402, 403 is pre-pressed into and stored in the fourth chamber 404, and during the forward stroke of the tubular piston rod 42, the air in the fourth chamber 404 is pressed into the tubular shaft 43 while air in the first chamber 401 is pre-pressed into the second and third chambers 402, 403. In this manner, the inflating efficiency of the inflating device 200 is further improved.
While the disclosure has been described in connection with what is considered the exemplary embodiment, it is understood that this disclosure is not limited to the disclosed embodiment but is intended to cover various arrangements included within the spirit and scope of the broadest interpretation so as to encompass all such modifications and equivalent arrangements.
Number | Date | Country | Kind |
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108109597 | Mar 2019 | TW | national |