Dual action hydraulic piston assembly

Patent metadata

Field	Value
Publication number	US-12438323-B2
Application number	US-202318341291-A
Country	US
Kind code	B2
Filing date	Jun 26, 2023
Priority date	Jul 2, 2018
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

A dual action hydraulic piston assembly including a cylinder having first and second inlet ports on a first end and an outlet port on a second end, a conduit connected to the first inlet port and extending into the cylinder, an inner ram slidable along an outer surface of the conduit, and an outer ram slidable between the inner ram and the cylinder. The inner and outer rams are configured to move together toward the second end of the cylinder in response to a fluid being displaced via the first inlet port into the conduit, which displaces a second fluid through the outlet port at a first flow rate. The outer ram is configured to move toward the second end of the cylinder in response to a fluid being displaced via the second inlet port, which displaces the second fluid through the outlet port at a second flow rate.

First claim

What is claimed is:

1. A dual action hydraulic piston assembly, comprising:
a cylinder having first and second inlet ports on a proximal end and an outlet port on a distal end;
a conduit connected to the first inlet port and extending into the cylinder;
an inner ram slidable along an outer surface of the conduit; and
an outer ram slidable between an outer surface of the inner ram and an inner surface of the cylinder,
a proximal fluid space around the conduit between the proximal end of the cylinder and proximal ends of the inner ram and the outer ram,
a distal fluid space between the distal end of the cylinder and distal ends of the inner ram and the outer ram, the distal fluid space being separate from the proximal fluid space,
wherein the inner ram and the outer ram are configured to move together toward the distal end of the cylinder, in response to a first fluid being displaced via the first inlet port into the conduit, to displace a second fluid in the distal fluid space through the outlet port at a first flow rate, and
wherein the outer ram is configured to move toward the distal end of the cylinder, in response to a third fluid being displaced via the second inlet port into the proximal fluid space, to displace the second fluid in the distal fluid space through the outlet port at a second flow rate.

2. The dual action hydraulic piston assembly of claim 1 , wherein the second flow rate is less than the first flow rate.

3. The dual action hydraulic piston assembly of claim 1 , wherein movement of the inner ram and the outer ram together by the first fluid being displaced into the conduit displaces the second fluid through the outlet port at a first pressure, and movement of the outer ram by the third fluid being displaced via the second inlet port displaces the second fluid through the outlet port at a second pressure greater than the first pressure.

4. The dual action hydraulic piston assembly of claim 1 , wherein a length of the outer ram along a longitudinal axis of the cylinder is less than a length of the inner ram along the longitudinal axis.

5. The dual action hydraulic piston assembly of claim 1 , further comprising a first stop on the outer surface of the inner ram and a second stop on an inner surface of the outer ram, wherein the first stop engages with the second stop to allow for the inner ram and the outer ram to move together toward the distal end of the cylinder.

6. The dual action hydraulic piston assembly of claim 5 , wherein the first stop is a flange about a proximal end of the inner ram and the second stop is a recess in a proximal end of the outer ram.

7. The dual action hydraulic piston assembly of claim 1 , further comprising:
a retaining ring fixable within a retaining groove about a distal end of the inner ram to provide an upper limit for movement of the outer ram.

8. The dual action hydraulic piston assembly according to claim 1 ,
wherein, in a fully retracted state, a proximal end of the inner ram and a proximal end of the outer ram are positioned adjacent to the proximal end of the cylinder, and a distal end of the inner ram and a distal end of the outer ram are positioned a distance from the distal end of the cylinder defining the distal fluid space.

9. The dual action hydraulic piston assembly of claim 1 , wherein the second inlet port is positioned radially outboard of the first inlet port.

10. The dual action hydraulic piston assembly of claim 1 , wherein an exterior of the inner ram has a distal surface with a recess that extends at least partially across the distal surface, the recess providing a fluid path for the second fluid when the distal surface of the inner ram is against the distal end of the cylinder.

11. The dual action hydraulic piston assembly of claim 1 , further comprising a tool head including a tool head hydraulic actuator hydraulically connected to the outlet port, the tool head hydraulic actuator actuating the tool in response to the displacement of the second fluid.

12. The dual action hydraulic piston assembly of claim 1 , wherein the outer ram is moveable, by the third fluid displaced from the second inlet port, at a second advance rate that is at least three times that of a first advance rate that the inner ram and the outer ram are moveable by the first fluid being displaced from the first inlet port into the conduit.

13. The dual action hydraulic piston assembly of claim 1 , further comprising a spring acting between the inner ram and the outer ram.

14. A dual action hydraulic piston assembly, comprising:
a cylinder having first and second inlet ports on a first end and an outlet port on a second end;
a conduit connected to the first inlet port and extending into the cylinder;
an inner ram slidable along an outer surface of the conduit; and
an outer ram slidable between an outer surface of the inner ram and an inner surface of the cylinder,
wherein the inner ram and the outer ram are configured to move together toward the second end of the cylinder, in response to first fluid being displaced via the first inlet port into the conduit, to displace a second fluid through the outlet port at a first flow rate, and
wherein the outer ram is configured to move toward the second end of the cylinder, in response to a third fluid being displaced via the second inlet port, to displace the second fluid through the outlet port at a second flow rate,
further comprising a spring circumscribing the outer surface of the inner ram, the spring acting between the inner ram and the outer ram, the spring having a first end adjacent to a distal end of the outer ram and a second end adjacent to a distal end of the inner ram.

15. The dual action hydraulic piston assembly of claim 14 , wherein the spring is a wave spring.

16. The dual action hydraulic piston assembly of claim 14 , wherein the inner ram includes a retainer mounted at the distal end of the inner ram end receiving the second end of the spring, the retainer having a diameter greater than a diameter of the distal end of the inner ram.

17. The dual action hydraulic piston assembly of claim 16 , wherein the retainer has a plurality of grooves to allow fluid to flow around the retainer.

18. A dual action hydraulic piston assembly, comprising:
a cylinder having first and second inlet ports on a first end and an outlet port on a second end;
a conduit connected to the first inlet port and extending into the cylinder;
an inner ram slidable along an outer surface of the conduit; and
an outer ram slidable between an outer surface of the inner ram and an inner surface of the cylinder,
wherein the inner ram and the outer ram are configured to move together toward the second end of the cylinder, in response to first fluid being displaced via the first inlet port into the conduit, to displace a second fluid through the outlet port at a first flow rate, and
wherein the outer ram is configured to move toward the second end of the cylinder, in response to a third fluid being displaced via the second inlet port, to displace the second fluid through the outlet port at a second flow rate,
wherein the outer ram is moveable, by the third fluid displaced from the second inlet port, at a second advance rate that is at least three times that of a first advance rate that the inner ram and the outer ram are moveable by the first fluid being displaced from the first inlet port into the conduit.

19. The dual action hydraulic piston assembly of claim 1 ,
wherein the inner ram and the outer ram are moveable, by the first fluid being displaced

Assignees

• Hubbell Inc

Inventors

• Torrey Cameron Michael-Daniel
• Poirier Robert Michael
• Guarrera Michael Anthony
• Desmarais Luke John
• Faucher Thomas Romeo

Classifications

• A01G2003/023

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• B66F3/28

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• B23D21/06

  Hand-operated tube-cutters · CPC title

• H01R43/0428

  Power-driven hand crimping tools · CPC title

• B23D15/14

  actuated by fluid or gas pressure · CPC title