US3450006A - Cylinder and piston assembly with automatic power release - Google Patents
Cylinder and piston assembly with automatic power release Download PDFInfo
- Publication number
- US3450006A US3450006A US701238A US3450006DA US3450006A US 3450006 A US3450006 A US 3450006A US 701238 A US701238 A US 701238A US 3450006D A US3450006D A US 3450006DA US 3450006 A US3450006 A US 3450006A
- Authority
- US
- United States
- Prior art keywords
- piston
- valve
- cylinder
- passage
- blade
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
Definitions
- the instant invention is generally concerned with a hydraulic motor or cylinder and piston assembly utilized in driving a tree shearing blade, and is more particularly concerned with a power release incorporated in the assembly so as to prevent a power driving of the blade beyond a predetermined point.
- valved power release which is positive acting and capable of trouble-free operation, utilizing a highly unique, while at the same time relatively simple construction.
- the objects of the above invention are achieved through the utilization of a pair of laterally orientated valves mounted within the piston of a cylinder and piston assembly with one of the valves being released through physical engagement with an adjustable abutment, the released valve allowing the passage of fluid thereby and, through a diagonal fluid passage, through the second valve which is in the nature of a one-way check valve communicated with the release or exhausting side of the piston.
- the nature of the check valve is such so as to cause an immediate opening thereof in response to a pressure differential.
- FIGURE 1 is a top plan view of a tree shearing unit illustrating the general environment of the instant invention
- FIGURE 2 is an enlarged cross-sectional view through the forward end of the cylinder and piston assembly of the 3,450,006 Patented June 17, 1969 instant invention with the piston in a retracted position;
- FIGURE 3 is a view similar to FIGURE 2 with the piston at the completion of its stroke and with the power release construction open;
- FIGURE 4 is a cross-sectional view similar to FIGURE 3 with the assembly rotated approximately so as to illustrate the entire power release arrangement;
- FIGURE 5 is a cross-sectional view taken substantially on a plane passing along line 55 in FIGURE 3;
- FIGURE 6 is a cross-sectional view illustrating the manner in which the shearing blade cooperates with a fixed jaw or anvil in effecting the tree severing or shearing.
- reference numeral 10 is used to generally designate the hydraulic motor or cylinder and piston assembly.
- This assembly 10 will, in actual use, normally be utilized as a motivating means for a pivotally mounted tree shearing blade 12 which cooperates with a fixed jaw or anvil type blade 14 in effecting the shearing of a tree or the like 16.
- the possibility of damage to the blade, blade frame, anvil or hydraulic system itself is great unless the power effecting the movement of the blade is released at the appropriate time, such of course being subsequent to the shearing of the tree and prior to the introduction of undesirable stresses to the entire assembly.
- the automatic power release for the assembly 10 has been devised.
- the assembly 10 is, in itself, conventional in that it includes an elongated cylinder 18 within which a piston 20 is slidably mounted.
- the piston 20 mounts an elongated piston rod 22 which is slidably received through a cylinder head 24 on the forward end of the cylinder 18.
- Suitable fluid ports 26 are in communication with the cylinder 18 adjacent both the forward head 24 and a similar head at the rear end thereof, these ports 26 in turn being in communication with a fluid or hydraulic system, through lines 28, such a system normally being mounted on an associated vehicle, such as for example the propelling tractor of FIGURE 1.
- Suitable sealing rnigs 30 and 32 are provided so as to enable a fluid excluding sliding movement of both the piston 20 and the rod 22, also in a substantially conventional manner.
- the piston 20 is provided, radially of the rod 22, with a first valve passage 36 therethrough, this valve passage 36 slidably receives an elongated valve stem 38 therethrough in what amounts to a fluid tight manner.
- the stem 38 on the rear chamber side of the piston 20, includes an enlarged valve or valve head 40 which seats against an enlarged valve seat 42 provided in the counterbored rear end of the valve passage 36.
- the forward end of the valve passage is also counterbored so as to define an enlarged forwardly opening chamber 44 within which a coiled expanded compression spring 46 is seated.
- This spring 46 surrounds the valve stem 38 and bears, at one end thereof, against the inner end of the counterbored chamber 44 and, at the other end thereof against a washer or ring 48 aflixed to the forward end of the valve stem 38 by a suitable lock ring 50 or the like.
- the retraction of the valve 40 is effected through an engagement of the forward end 52 of the valve stem 38- with an abutment or abutment head 54 provided on the inner end of a threaded shaft 56 threaded through an internally threaded hole or passage 58 in the cylinder head 24.
- the bolt 56 is to be provided with an appropriate tool receiving head 60 on the outer end thereof and has an appropriate lock nut 62 threaded thereon and engageable against the outer face of the head 24 so as to fix the bolt 56 in its adjusted position.
- the bolt 56 is of a length so as to project both inwardly and outwardly of the cylinder head 24 so as to provide for a substantial range of adjustment, and thereby vary the point at which the valve 40 is unseated and the power released.
- a complete unseating of the valve 40 is effected prior to engagement of the spring retaining washer 48 against the forward face of the piston 20.
- a diagonal fluid passage 64 which communicates the countersunk valve seat defining portion of the passage 36 with the inner end of a fluid passing bore 66 which opens through the forward face of the piston 20 and has an internally mounted one-way ball check valve 68 spring-biased, by suitable spring means 70, against a valve seat 72 defined at the communicating end of the diagonal fluid passage 64.
- the check valve 68 can actually be mounted in any appropriate springloaded manner within its bore 66 laterally spaced from the passage 36, as long as adequate space is provided thereabout, when open, for the passage of the released fluid from the rear or high pressure chamber to the forward or low pressure chamber.
- the stroke adjusting member will be adjusted so as to effect a power release through the piston 20 at a predetermined point.
- the stem end 52 will engage the abutment head 54 and the valve 40 will be unseated.
- the valve 40 leaving its seat the fluid from the high pressure side of the piston 20 will flow past the valve 40, through the diagonal passage 64, and, upon an automatic releasing of the one-way ball check valve 68, through the bore 66 into the rear exhaust chamber for discharge through the associated exhausting port 26. In this manner a release of power will be automatically effected and forward movement of the piston 20, as well as the associated blade 12, terminated.
- the strength of the ball biasing spring 70 should be such so as to, while being capable of positively seating the ball 68 upon the presence of equal pressure to the opposite sides thereof, be responsive to the minimum pressure differential which will be utilized to effect the powered forward movement of the piston 20 whereby upon a retraction of the valve 40 immediate release of pressure can be effected to the forward exhaust chamber so as to avoid any delay in effecting the relieving of the piston moving pressure and the halting of the piston and'associated blade at a predetermined point defined by the adjustable abutment defining member which operates the valve assembly.
- a cylinder and piston assembly comprising a cylinder, a forward cylinder head, a double-acting piston slid-v ably disposed within said cylinder and defining forward and rear pressure chambers for powered movement toward and away from said head by the selective introduction of pressure to the opposite sides thereof, and release means for effecting an automatic communication between said chambers through said piston upon the introduction of a high pressure in said rear chamber and movement of the piston to a predetermined point along its path of movement toward said cylinder head, said piston having forward and rear faces, said release means comprising a valve stem slidably received through said piston and projecting beyond the forward face thereof, a'valve seat defined in the rear face of said piston, a valve head on said stem, means resiliently biasing said valve head into seated engagement with said seat, a laterally directed fluid passage within said piston having a first end in fluid receiving communication with the inner end of said valve seat for reception of fluid therefrom upon an unseating of the valve head, a second fluid passage in generally laterally parallel relation to the valve stem, said second
- said release means further includes an abutment mounted on said cylinder head and projecting into said forward chamber, said abutment being engageable with said valve stem upon a forward movement of said piston for effecting an unseating of said valve head at a predetermined point along the path of movement of said piston.
- the assembly of claim 2 including means for adjusting the amount of projection of said abutment into said forward chamber for adjusting the predetermined point at which said valve head is unseated.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Safety Valves (AREA)
Description
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US70123868A | 1968-01-29 | 1968-01-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3450006A true US3450006A (en) | 1969-06-17 |
Family
ID=24816553
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US701238A Expired - Lifetime US3450006A (en) | 1968-01-29 | 1968-01-29 | Cylinder and piston assembly with automatic power release |
Country Status (1)
Country | Link |
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US (1) | US3450006A (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3626477A (en) * | 1969-10-30 | 1971-12-07 | Fulghum Enterprises Inc | Timber shear |
US3731720A (en) * | 1970-07-27 | 1973-05-08 | Caterpillar Tractor Co | Shear assembly for tree harvesters |
US3962955A (en) * | 1973-01-04 | 1976-06-15 | Outboard Marine Corporation | Power trim-tilt system |
US4256433A (en) * | 1979-04-09 | 1981-03-17 | J. I. Case Company | Hydraulic circuit for earthworking implement |
US4700955A (en) * | 1985-08-29 | 1987-10-20 | Pratt Burnerd International Limited | Chucks |
US4763742A (en) * | 1987-02-05 | 1988-08-16 | Allied Systems Company | Tree feller-buncher |
US4823852A (en) * | 1987-02-05 | 1989-04-25 | Allied Systems Company | Tree feller-buncher |
US4825752A (en) * | 1987-12-14 | 1989-05-02 | Commercial Shearing, Inc. | End-of-stroke bypass valve in piston for impact relief in hydraulic tilt and trim cylinder |
US5094081A (en) * | 1983-07-21 | 1992-03-10 | Osborne Lyle E | Hydraulic brake system valved piston |
WO2001098671A1 (en) * | 2000-06-21 | 2001-12-27 | Klaus Brugger | Lifting device |
US6490962B1 (en) | 2001-05-17 | 2002-12-10 | The Stanley Works | Hydraulic tool with an OC/CC selector |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1904345A (en) * | 1930-11-19 | 1933-04-18 | Anthony Co | Hydraulic hoist dumping body |
US2233521A (en) * | 1937-06-15 | 1941-03-04 | Hydraulic Press Corp Inc | Double-acting check valve device |
US2265314A (en) * | 1936-07-15 | 1941-12-09 | Waterbury Tool Co | Power transmission |
US2630830A (en) * | 1951-12-17 | 1953-03-10 | Bendix Aviat Corp | Fluid-metering shutoff valve |
US2948263A (en) * | 1958-05-19 | 1960-08-09 | Gen Motors Corp | Propeller torque unit construction |
US3148591A (en) * | 1962-10-25 | 1964-09-15 | John M Sheesley | Remote controlled actuator |
US3173341A (en) * | 1964-01-29 | 1965-03-16 | Donald E Smiley | Reciprocating hydraulic motor |
US3182563A (en) * | 1963-08-19 | 1965-05-11 | Thompson Ramo Wooldridge Inc | Hydraulic cylinder piston |
-
1968
- 1968-01-29 US US701238A patent/US3450006A/en not_active Expired - Lifetime
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1904345A (en) * | 1930-11-19 | 1933-04-18 | Anthony Co | Hydraulic hoist dumping body |
US2265314A (en) * | 1936-07-15 | 1941-12-09 | Waterbury Tool Co | Power transmission |
US2233521A (en) * | 1937-06-15 | 1941-03-04 | Hydraulic Press Corp Inc | Double-acting check valve device |
US2630830A (en) * | 1951-12-17 | 1953-03-10 | Bendix Aviat Corp | Fluid-metering shutoff valve |
US2948263A (en) * | 1958-05-19 | 1960-08-09 | Gen Motors Corp | Propeller torque unit construction |
US3148591A (en) * | 1962-10-25 | 1964-09-15 | John M Sheesley | Remote controlled actuator |
US3182563A (en) * | 1963-08-19 | 1965-05-11 | Thompson Ramo Wooldridge Inc | Hydraulic cylinder piston |
US3173341A (en) * | 1964-01-29 | 1965-03-16 | Donald E Smiley | Reciprocating hydraulic motor |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3626477A (en) * | 1969-10-30 | 1971-12-07 | Fulghum Enterprises Inc | Timber shear |
US3731720A (en) * | 1970-07-27 | 1973-05-08 | Caterpillar Tractor Co | Shear assembly for tree harvesters |
US3962955A (en) * | 1973-01-04 | 1976-06-15 | Outboard Marine Corporation | Power trim-tilt system |
US4256433A (en) * | 1979-04-09 | 1981-03-17 | J. I. Case Company | Hydraulic circuit for earthworking implement |
US5094081A (en) * | 1983-07-21 | 1992-03-10 | Osborne Lyle E | Hydraulic brake system valved piston |
US4700955A (en) * | 1985-08-29 | 1987-10-20 | Pratt Burnerd International Limited | Chucks |
US4763742A (en) * | 1987-02-05 | 1988-08-16 | Allied Systems Company | Tree feller-buncher |
US4823852A (en) * | 1987-02-05 | 1989-04-25 | Allied Systems Company | Tree feller-buncher |
US4825752A (en) * | 1987-12-14 | 1989-05-02 | Commercial Shearing, Inc. | End-of-stroke bypass valve in piston for impact relief in hydraulic tilt and trim cylinder |
WO2001098671A1 (en) * | 2000-06-21 | 2001-12-27 | Klaus Brugger | Lifting device |
US6490962B1 (en) | 2001-05-17 | 2002-12-10 | The Stanley Works | Hydraulic tool with an OC/CC selector |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: TIMBERJACK, INC., WOODSTOCK, ONTARIO, CANADA A CO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:EATON YALE LTD.;REEL/FRAME:003903/0917 Effective date: 19810731 |
|
AS | Assignment |
Owner name: TIMBERJACK INC., 925 DEVONSHIRE AVE., WOODSTOCK, O Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:EATON YALE LTD., AN ONTARIO CORP;REEL/FRAME:004379/0881 Effective date: 19840723 |
|
AS | Assignment |
Owner name: EATON YALE LTD., WOODSTOCK, ONTARIO, CANADA AN ONT Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:TIMBERJACK INC., AN ONTARIO CORP.;REEL/FRAME:004026/0220 Effective date: 19820805 |
|
AS | Assignment |
Owner name: ROYAL BANK OF CANADA, THE, CALGARY, ALBERTA A CANA Free format text: SECURITY INTEREST;ASSIGNORS:TIMBERJACK HOLDING, INC.;TIMBERJACK, INC., A CORP OF DE;TIMBERJACK INC., A CORP OF ONTARIO CANADA;REEL/FRAME:004301/0160 Effective date: 19840723 Owner name: ROYAL BANK OF CANADA, THE, NEW YORK, NY A CANADIAN Free format text: SECURITY INTEREST;ASSIGNORS:TIMBERJACK HOLDING, INC.;TIMBERJACK, INC., A CORP OF DE;TIMBERJACK INC., A CORP OF ONTARIO CANADA;REEL/FRAME:004301/0160 Effective date: 19840723 Owner name: WELLS FARGO BANK, N.A., A UNITED STATES NATIONAL B Free format text: SECURITY INTEREST;ASSIGNORS:TIMBERJACK HOLDING, INC.;TIMBERJACK, INC., A CORP OF DE;TIMBERJACK INC., A CORP OF ONTARIO CANADA;REEL/FRAME:004301/0160 Effective date: 19840723 Owner name: WELLS FARGO BANKS CANADA, A CANADIAN CHARTERED BAN Free format text: SECURITY INTEREST;ASSIGNORS:TIMBERJACK HOLDING, INC.;TIMBERJACK, INC., A CORP OF DE;TIMBERJACK INC., A CORP OF ONTARIO CANADA;REEL/FRAME:004301/0160 Effective date: 19840723 |