Hydraulic tool

Patent metadata

Field	Value
Publication number	US-10312653-B2
Application number	US-201615147707-A
Country	US
Kind code	B2
Filing date	May 5, 2016
Priority date	May 6, 2015
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

A hydraulic tool. The hydraulic tool includes a tool working end and a tool main section operably coupled to the tool working end. The tool main section comprising a ram assembly, the ram assembly includes a pretensioned return spring. A tool transmission end is operably coupled to the tool main section for hydraulically operating the tool working end.

First claim

We claim:

1. A hydraulic tool comprising:
a tool working end;
a tool main section operably coupled to the tool working end, the tool main section comprising a ram assembly, the ram assembly comprising a variable, pretensioned return spring surrounding an outer surface of a ram piston disposed in a main ram chamber, wherein the pretensioned return spring comprises a spring loop coupled to a pin disposed in a fluid passage, wherein the pin is a hollow passage pin having a hollow passage that fluidly couples the main ram chamber to the fluid passage; and
a tool transmission end operably coupled to the tool main section for hydraulically driving the tool working end.

2. The hydraulic tool of claim 1 , wherein the ram assembly further comprises:
a main ram portion,
wherein the main ram portion defines the main ram chamber.

3. The hydraulic tool of claim 2 ,
wherein the ram piston is positioned within the main ram chamber defined by the main ram portion, the ram piston operably coupled to the main ram portion.

4. The hydraulic tool of claim 3 ,
wherein a first end of the pretensioned return spring is affixed to the ram main portion by way of a spring return screw.

5. The hydraulic tool of claim 4 ,
wherein the spring return screw is threaded to a front threaded end of the ram piston such that a depth that the spring return screw may be threaded into this threaded end of the ram piston is variable.

6. The hydraulic tool of claim 4 , further comprising
a ram spacer operatively coupled to a first end of the spring return screw.

7. The hydraulic tool of claim 6 ,
wherein the ram spacer is operatively coupled through a cavity defined by a die head of the hydraulic tool.

8. The hydraulic tool of claim 3 , wherein a second end of the pretensioned return spring is affixed to a portion of a cylinder, and wherein the cylinder defines a cylinder cavity that is configured to contain the ram assembly.

9. The hydraulic tool of claim 8 , wherein the second end of the pretensioned return spring comprises the spring loop, wherein the spring loop passes through the fluid passage.

10. The hydraulic tool of claim 9 , further comprising:
an over pressure device fluidly coupled to the fluid passage,
wherein the hollow passage pin provides for fluid communication between the main ram chamber and the over pressure device.

11. The hydraulic tool of claim 10 , wherein the over pressure device comprises a burst cap.

12. The hydraulic tool of claim 1 , wherein the hydraulic tool comprises a hydraulic crimping tool.

13. The hydraulic tool of claim 1 , wherein the ram assembly is adapted to be moved relative to a frame of the tool working end by hydraulic fluid that is contained within a bladder and that is under control of a fluid passage circuit.

14. The hydraulic tool of claim 13 , further comprising:
a hydraulic pump;
a gear reducer; and
an electric motor configured to drive the hydraulic pump by way of the gear reducer, and wherein as the electric motor rotates, a pump piston reciprocates thereby providing the hydraulic fluid to the fluid passage circuit, and
the hydraulic fluid is withdrawn from the bladder and delivered to the ram assembly, thereby moving the ram assembly towards the tool working end.

15. The hydraulic tool of claim 13 , further comprising:
a release lever,
wherein deactivating the release lever allows for control of a position of the ram assembly during a return cycle based on when the release lever is deactivated.

16. The hydraulic tool of claim 15 , wherein deactivating the release lever prevents hydraulic fluid from passing through a release valve chamber and therefore stops the ram assembly from moving towards a home position.

17. The hydraulic tool of claim 1 , further comprising:
an outer housing; and
a tool handle disposed near a distal end of the outer housing and along a vertical axis of the hydraulic tool, wherein the tool handle is configured to be gripped in an orientation that is substantially parallel to the vertical axis of the hydraulic tool.

18. The hydraulic tool of claim 17 , further comprising:
a trigger disposed on the tool handle,
wherein the trigger is configured to be activated by a trigger movement along a horizontal axis of the hydraulic tool.

19. The hydraulic tool of claim 17 , wherein the outer housing forms a top surface, and wherein the top surface comprises a curved arm support that supports an arm of a user of the hydraulic tool when the user grasps the tool handle.

Assignees

• Milwaukee Electric Tool Corp

Inventors

• Ballard James G
• Ellice Joseph H
• Norquist Eric

Classifications

• B25B27/10

  inserting fittings into hoses · CPC title

• H01R43/0427 Primary

  fluid actuated hand crimping tools · CPC title