1. Field of the Invention
The present invention relates to a hydraulic puller, and more particularly to a hydraulic puller that can be used to clamp the wheel rim and the wheel axle easily and rapidly, thereby facilitating the user detaching the wheel rim from the wheel axle.
2. Description of the Related Art
A conventional hydraulic puller can be used to detach the wheel rim from the wheel axle and comprises a hydraulic cylinder having a lower section formed with an outer thread, and a clamping device including a support seat formed with an inner thread screwed on the outer thread of the hydraulic cylinder, and a plurality of claws each pivotally mounted on the support seat and each having a distal end formed with a hook hooked on the wheel rim. Thus, the support seat can be rotated by the user's hand to rotate and lift the clamping device to control operation of each of the claws. The conventional hydraulic puller also comprises an oil control device to control the oil path.
However, the support seat cannot be rotated easily and conveniently, thereby causing inconvenience to the user when operating the conventional hydraulic puller. In addition, the oil control device is mounted on an outside of the conventional hydraulic puller, so that the user easily misadjusts the oil path of the oil control device, thereby wearing the conventional hydraulic puller. Further, the oil path of the oil control device is operated slowly, so that the wheel rim and the wheel axle cannot be positioned easily and rapidly, thereby decreasing the working efficiency of the conventional hydraulic puller.
The primary objective of the present invention is to provide a hydraulic puller, wherein the operation shaft and the urging unit are moved to press the wheel axle rapidly by control of the oil control device, so that the hydraulic puller can be used to clamp the wheel rim and the wheel axle easily and rapidly, thereby facilitating the user detaching the wheel rim from the wheel axle.
Another objective of the present invention is to provide a hydraulic puller, wherein the operation handle of the pump has an adjustable length, so as to fit users of different statures, thereby enhancing the versatility of the hydraulic puller.
A further objective of the present invention is to provide a hydraulic puller, wherein the operation plate can be rotated by the user's hand to rotate and lift the clamping device so as to control operation of each of the claws, thereby facilitating the user operating the hydraulic puller.
A further objective of the present invention is to provide a hydraulic puller, wherein the oil control device is built in the inside of the hydraulic puller, thereby preventing the user from misadjusting the oil path so as to protect the hydraulic puller.
In accordance with the present invention, there is provided a hydraulic puller, comprising a hydraulic cylinder, a pump, an oil tank, and a clamping device, wherein:
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
Referring to the drawings and initially to
The hydraulic cylinder 2 has an inner wall formed with an oil chamber 20 for receiving an operation shaft 24 and an oil guide tube 25. The operation shaft 24 is movably mounted in the oil chamber 20 of the hydraulic cylinder 2 and has a lower end provided with an urging unit 26. The hydraulic cylinder 2 has an upper section 22 formed with a central hole 228, the operation shaft 24 has an upper end formed with an oil chamber 240, and the oil guide tube 25 has an upper end mounted in the central hole 228 of the upper section 22 of the hydraulic cylinder 2 and a lower end movably mounted in the oil chamber 240 of the operation shaft 24. A spring 242 is mounted on the operation shaft 24 and has a first end secured on a top of the operation shaft 24 and a second end secured on a bottom of the hydraulic cylinder 2.
The hydraulic cylinder 2 has a lower section formed with an outer thread 23. The clamping device 5 includes a support seat 50 mounted on the hydraulic cylinder 2 and formed with an inner thread 500 screwed on the outer thread 23 of the hydraulic cylinder 2.
The clamping device 5 further includes a plurality of pivot plates 51 each mounted on an outer wall of the support seat 50, a plurality of connecting plates 52 each having a first end pivotally mounted on a respective one of the pivot plates 51, and a plurality of claws 53 each having a mediate portion pivotally mounted on a second end of a respective one of the connecting plates 52 and each having a distal end formed with a hook 531.
As shown in
The oil control device 1 includes an oil supply check valve 11, a high pressure check valve 12, an oil return switch 13, a check valve 14, a pressure switch valve 15, a quick oil supply valve 16, and a pressure regulating valve 17.
As shown in
As shown in
As shown in
The check valve 14 is mounted in the first receiving hole 221 of the upper section 22 of the hydraulic cylinder 2 and is rested on the oil return switch 13 to stop connection between the first-receiving hole 221 of the upper section 22 of the hydraulic cylinder 2 and the central hole 228 of the upper section 22 of the hydraulic cylinder 2.
The pressure switch valve 15 is mounted in a second receiving hole 223 of the upper section 22 of the hydraulic cylinder 2. The second receiving hole 223 of the upper section 22 of the hydraulic cylinder 2 has a mediate portion communicating with a lower guide hole 224 (see
The quick oil supply valve 16 is screwed in a screw bore 229 of the top of the hydraulic cylinder 2 to seal a through hole 227 which is formed in the upper section 22 of the hydraulic cylinder 2. As shown in
As shown in
In operation, referring to
When the piston 31 of the pump 3 is moved upward by the operation handle 32 of the pump 3 as shown in
When the piston 31 of the pump 3 is moved downward by the operation handle 32 of the pump 3 as shown in
In addition, during movement of the piston 31 of the pump 3, the high pressure check valve 12 mounted in the oil supply check valve 11 can prevent the oil contained in the pump 3 from reversely flowing into the oil chamber 41 of the oil tank 4.
After the wheel rim 6 is detached from the wheel axle 7, the oil return switch 13 is rotated to release the check valve 14 which is moved by a spring 140 (see
Then, the operation shaft 24 is pressed by the restoring force of the spring 242 to move toward the hydraulic cylinder 2 to compress the oil contained in the oil chamber 20 of the hydraulic cylinder 2, so that the oil contained in the oil chamber 20 of the hydraulic cylinder 2 is introduced through the oil chamber 240 of the operation shaft 24, the oil guide tube 25, the central hole 228 of the upper section 22 of the hydraulic cylinder 2, the first receiving hole 221 of the upper section 22 of the hydraulic cylinder 2 and the oblique hole 222 of the hydraulic cylinder 2 into the oil chamber 41 of the oil tank 4. Thus, the oil contained in the oil chamber 20 of the hydraulic cylinder 2 completely flows back into the oil chamber 41 of the oil tank 4.
Accordingly, the operation shaft 24 and the urging unit 26 are moved to press the wheel axle 7 rapidly by control of the oil control device 1, so that the hydraulic puller can be used to clamp the wheel rim 6 and the wheel axle 7 easily and rapidly, thereby facilitating the user detaching the wheel rim 6 from the wheel axle 7. In addition, the operation handle 32 of the pump 3 has an adjustable length, so as to fit users of different statures, thereby enhancing the versatility of the hydraulic puller. Further, the operation plate 55 can be rotated by the user's hand to rotate and lift the clamping device 5 so as to control operation of each of the claws 53, thereby facilitating the user operating the hydraulic puller. Further, the oil control device 1 is built in the inside of the hydraulic puller, thereby preventing the user from misadjusting the oil path so as to protect the hydraulic puller.
Although the invention has been explained in relation to its preferred embodiment(s) as mentioned above, it is to be understood that many other possible modifications and variations can be made without departing from the scope of the present invention. It is, therefore, contemplated that the appended claim or claims will cover such modifications and variations that fall within the true scope of the invention.
Number | Name | Date | Kind |
---|---|---|---|
5233740 | Chen | Aug 1993 | A |
5419027 | McPeak et al. | May 1995 | A |
6266861 | Chen | Jul 2001 | B1 |
6581261 | Chen | Jun 2003 | B1 |