초록 ▼

The present invention provides a safety device of vibration roller wherein a travel switching device of the roller is switched to a neutral position automatically and the roller stops automatically when the operator is caught between the roller and an obstacle, and a safety switch is activated, even

The present invention provides a safety device of vibration roller wherein a travel switching device of the roller is switched to a neutral position automatically and the roller stops automatically when the operator is caught between the roller and an obstacle, and a safety switch is activated, even if the travel lever is placed in the reverse position continuously. A back end (16a) of an outer tube of an operation cable (7) is locked in front of the travel lever (4) in the case (2) when a safety switch (22) is not activated, the back end (16a) of the outer tube is released and displaced to a direction of the travel lever (4) when the safety switch (22) is activated.

대표청구항 ▼

What is claimed is: 1. A vibration roller comprising: an operating portion; a travel lever on the operating portion for controlling forward, neutral, and reverse operation of the roller; a safety switch for preventing an operator from being caught between the roller and an obstacle when moving back

What is claimed is: 1. A vibration roller comprising: an operating portion; a travel lever on the operating portion for controlling forward, neutral, and reverse operation of the roller; a safety switch for preventing an operator from being caught between the roller and an obstacle when moving backward; a travel switching device; and a safety device including: a operation cable connecting the travel lever and the travel switching device, wherein the operation cable includes a bendable outer tube having a front end and a back end, and the front end of the outer tube is supported on a side of the travel lever and the back end of the outer tube is supported on a side of the travel switching device, the back end of the outer tube being locked in front of the travel lever while the safety switch is not activated, and the back end of the outer tube being released and extended in a direction of the travel lever when the safety switch is activated. 2. The roller as claimed in claim 1, further comprising a locking mechanism which locks the back end of the outer tube into the operating portion, wherein the locking mechanism comprises: a turning plate having a bottom fixed axially in a front part in the operating portion so as to be pivotable forward and backward of the roller; an oscillating plate fixed axially on both sides of a top of the turning plate under a condition that the back end of the outer tube is pivotally supported; and a cam for locking the turning plate in a locking position. 3. The roller as claimed in claim 2, wherein the cam of the locking mechanism is provided at a front end of the safety switch, a bottom of the cam is pulled backward by forces of a spring when the safety switch is not activated, and a top of the cam pushes and locks the turning plate for preventing the turning plate from turning in a direction of the travel lever. 4. The roller as claimed in claim 3, wherein an inclined concave-portion is provided on a back side of the turning plate contacted by the cam provided at the front end of the safety switch so that the turning plate can turn in a proper angle while touching the cam when a lock of the back end of the outer tube is released by turning of the turning plate. 5. The roller as claimed in claim 2, wherein an inclined concave-portion is provided on a back side of the turning plate contacted by the cam provided at the front end of the safety switch so that the turning plate can turn in a proper angle while touching the cam when a lock of the back end of the outer tube is released by turning of the turning plate. 6. The roller as claimed in claim 1, wherein the operation cable includes an inner wire, and the outer tube is arranged around the inner wire. 7. The roller as claimed in claim 6, wherein the outer tube is arranged to bend relative to the inner wire such that when the back end of the outer tube is extended upon activation of the safety device, the inner wire expands in a direction of the travel switching device to cause the travel switching device to switch the roller from reverse to neutral. 8. The roller as claimed in claim 6, wherein a back end of the inner wire is connected to the travel lever. 9. The roller as claimed in claim 8, wherein a front end of the inner wire is connected to the travel switching device. 10. The roller as claimed in claim 9, wherein the travel switching device includes a lever, and the back end of the inner wire is connected to the lever of the travel switching device. 11. The roller as claimed in claim 6, wherein the outer tube and the inner wire are movable relative to each other. 12. The roller as claimed in claim 1, wherein the operation cable is positioned between the travel lever and the travel switching device and coupled to the travel lever and the travel switching device to enable bending of the operation cable. 13. The roller as claimed in claim 1, further comprising a locking mechanism coupled to and selectively locking the back end of the outer tube. 14. The roller as claimed in claim 13, wherein the safety switch is arranged to interact with the locking mechanism to enable release of the locking of the back end of the outer tube when the safety switch is activated. 15. The roller as claimed in claim 13, wherein the operation cable includes an inner wire, the outer tube is arranged around the inner wire, and a back end of the inner wire is connected to the travel lever. 16. The roller as claimed in claim 15, wherein a front end of the inner wire is connected to the travel switching device. 17. The roller as claimed in claim 13, wherein the locking mechanism supports the back end of the outer tube. 18. The roller as claimed in claim 13, wherein the locking mechanism includes an oscillating plate having an opening for receiving the outer tube. 19. The roller as claimed in claim 13, further comprising a case, wherein the operating portion and the locking mechanism are arranged partly inside the case. 20. The roller as claimed in claim 13, wherein the locking mechanism is situated between the travel lever and the travel switching device.