Easily assembled inflator

An easily assembled inflator has a cylinder, a piston rod, a piston, an assembled seal cover and a sleeve. Because the assembled seal cover has at least two cover segments, the cover segments can be mounted around the piston rod by being connected together radially. Then the piston does not interfere with the cover segments and the sequence of the assembly of the piston and the assembled seal cover is not limited, as well. Thus, the assembly is more convenient and flexible. Besides, because the assembled seal cover has multiple cover segments, the whole assembled seal cover can bear more stress and has more room to be deformed. Then the assembled seal cover is not damaged and broken easily when pushed in to the cylinder. To sum up, the inflator as mentioned above is easy to be assembled and is not damaged easily during the assembly.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an easily assembled inflator, especially to an easily assembled inflator that is easy to be assembled and is not damaged easily during the assembly.

2. Description of the Prior Arts

An inflator gives air into sealed objects, such as tires and balls. With reference toFIGS. 5 and 6, the conventional portable inflator has a cylinder91, a piston rod92, a piston93, a seal cover94and a sleeve95. The cylinder91has an inner space, an opening911end, a closed end, a valve912and multiple annular grooves913. The valve912is mounted through the closed end. The annular grooves913are formed on an inside wall of the cylinder91and are formed adjacent to the opening911. The piston rod92is mounted in the cylinder91. The piston93is mounted on an end of the piston rod92and is mounted in the cylinder91. The seal cover94is mounted around the piston rod92and is mounted to the edge around the opening911of the cylinder91. The seal cover94has multiple side flanges941formed on an outside wall of the seal cover94and engaging with the annular grooves913of the cylinder91. Thus, the seal cover94is mounted securely to the cylinder91. The sleeve95is mounted around the edge around the opening911of the cylinder91and has a top flange951. The top flange951is formed annularly around an inside face of the sleeve95and adjacent to a top of the sleeve95. The top flange951is clamped between the edge around the opening911and the seal cover94to fill up a gap between the cylinder91and the seal cover94. Therefore, the cylinder91, the piston rod92, the seal cover94and the sleeve95are mounted securely and tightly.

However, the sequence of the assembly of the inflator is limited. For example, because the seal cover94is moved axially to mount around the piston rod92and an outer diameter of the seal cover94is bigger than an inner diameter of the piston93, the seal cover94must be mounted on the piston rod92before the piston93is mounted on the piston rod92, which causes inconvenience in the assembly. Besides, an outer diameter of the side flange941of the seal cover94is bigger than an inner diameter of the opening911of the cylinder91. Then the seal cover94must be pushed greatly so that the side flanges941may deformed and the seal cover94is inserted into the cylinder91. Nevertheless, the seal cover94is damaged and broken easily when being pushed. Thus, the high defect rate during production causes the manufacture of the inflator to not be sufficiently profitable.

To overcome the shortcomings, the present invention provides an easily assembled inflator to mitigate or obviate the aforementioned problems.

SUMMARY OF THE INVENTION

The main objective of the present invention is to provide an easily assembled inflator that is easy to be assembled and is not damaged easily during the assembly.

The easily assembled inflator in accordance with the present invention has a cylinder, a piston rod, a piston, an assembled seal cover and a sleeve. Because the assembled seal cover has at least two cover segments, the cover segments can be mounted around the piston rod by being connected together radially. Then the piston does not interfere with the cover segments and the sequence of the assembly of the piston and the assembled seal cover is not limited, as well. Thus, the assembly is more convenient and flexible. Besides, in the same way, because the assembled seal cover has multiple cover segments, the whole assembled seal cover can bear more stress and has more room to be deformed in comparison to the conventional integrated seal cover. Then the assembled seal cover is not damaged and broken easily when pushed in to the cylinder. To sum up, the inflator as mentioned above is easy to be assembled and is not damaged easily during the assembly.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

With reference toFIGS. 1 and 2, an easily assembled inflator in accordance with the present invention comprises a cylinder10, a piston rod20, a piston30, an assembled seal cover40and a sleeve50.

The cylinder10has an inner space, an opening end, a closed end and a valve12. The opening end has an opening11. The valve12is mounted through the closed end. In a preferred embodiment, the cylinder10has an annular groove13and a cylinder recess14. The annular groove13and the cylinder recess14are formed on an inside wall of the cylinder10and are formed adjacent to the opening11. The cylinder recess14is nearer to the opening11than the annular groove13.

The piston rod20is mounted in the cylinder10and has a first end, a second end and a holder21. The holder21is mounted on the first end.

The piston30is mounted on the second end of the piston rod20and is mounted in the cylinder10.

The assembled seal cover40is mounted around the piston rod20and has a set of cover segments41. Each cover segment41has a cover top flange411. The cover top flange411is formed around an outside wall of the cover segment41, is formed adjacent to a top of the cover segment41and corresponds to the opening11of the cylinder10. In a preferred embodiment, the assembled seal cover40has two cover segments41. One of the cover segments41has two mounting pins412formed on a side surface of the cover segment41, the other cover segment41has two mounting recesses413formed on a side surface of the cover segment41. The two cover segments41are connected together and are mounted around the piston rod20by inserting the mounting pins412into the mounting recess413tightly. Each cover segment41has a cover side flange414. The cover side flange414is formed on an outside wall of the cover segment41and engages with the annular groove13of the cylinder10to make the assembled seal cover40engage with the cylinder10. One of the cover segments41further has a cover protrusion415. The cover protrusion415is formed on the outside wall of the cover segment41and engages with the cylinder recess14of the cylinder10.

The sleeve50is mounted around the opening11of the cylinder10and has a sleeve top flange51. The sleeve top flange51is formed around an inside wall of the sleeve50, is formed adjacent to a top of the sleeve50and corresponds to the cover top flanges411of the assembled seal cover40. The cover segments41and the sleeve50are separate components. The cover segments41and the sleeve50transversely clamp the cylinder10. In a preferred embodiment, the sleeve top flange51is clamped between the edge of the opening11of the cylinder10and the cover top flanges411of the assembled seal cover40.

Because the sleeve top flange51of the sleeve50is clamped between the cylinder10and the assembled seal cover40and the assembled seal cover40engages with the cylinder10by the cover side flange414engaging with the annular groove13, the assembled seal cover40with the sleeve50is mounted securely to the cylinder10. Besides, the cover protrusion415of the cover segment41engages with the cylinder recess14of the cylinder10to keep the assembled seal cover40from being rotated relative to the cylinder10, which eliminates any possible misunderstanding about that the inflator is defective.

Because the assembled seal cover40has at least two cover segments41, the cover segments41can be mounted around the piston rod20by being connected together radially. Then the piston30does not interfere with the cover segments41and the sequence of the assembly of the piston30, the holder21and the assembled seal cover40is not limited, as well. Thus, the assembly is more convenient and flexible. Besides, in the same way, because the assembled seal cover40has multiple cover segments41, the whole assembled seal cover40can bear more stress and has more room to be deformed. Then the assembled seal cover40is not damaged and broken easily when pushed in to the cylinder10. In conclusion, the inflator as mentioned above is easy to be assembled and is not damaged easily during the assembly.

With reference toFIGS. 3 and 4, a second embodiment of an easily assembled inflator in accordance with the present invention is similar to the first embodiment as mentioned above. However, the two embodiments have some differences as follows.

In the second embodiment, the cylinder10A has no annular groove and cylinder recess, and further has an annular stepped sidewall15A and a cylinder protrusion16A. The annular stepped sidewall15A and the cylinder protrusion16A are formed on an outside wall of the cylinder10A. The cylinder protrusion16A is formed adjacent to the opening11A of the cylinder10A.

Each cover segment41A of the assembled seal cover40A has no cover side flange and cover protrusion, and the cover top flange411A is clamped between the edge of the opening11A of the cylinder10A and the sleeve top flanges51A of the sleeve50A.

The sleeve50A further has a sleeve side flange52A and a sleeve recess53A. The sleeve side flange52A is formed on the inside wall of the sleeve50A, and abuts against the annular stepped sidewall15A of the cylinder10A. The sleeve recess53A is formed on the inside wall of the sleeve50A, and engages with the cylinder protrusion16A of the cylinder10A.

In the second embodiment, the cover top flanges411A of the assembled seal cover40A are clamped between the cylinder10A and the sleeve50A, and the sleeve50A engages with the cylinder10A by the sleeve side flange52A abutting against the annular stepped sidewall15A to make the sleeve50A engage with the cylinder10A. Thus, the sleeve50A with the assembled seal cover40A is mounted securely to the cylinder10A. Besides, the engaging of the cylinder protrusion16A and the sleeve recess53A keeps the sleeve50A from being rotated relative to the cylinder10A.

The second embodiment has the same advantages, such as being easy to be assembled and being not damaged easily during the assembly.