US3878769A - Load clamping mechanism with limited play in arms - Google Patents

Load clamping mechanism with limited play in arms Download PDF

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Publication number
US3878769A
US3878769A US367764A US36776473A US3878769A US 3878769 A US3878769 A US 3878769A US 367764 A US367764 A US 367764A US 36776473 A US36776473 A US 36776473A US 3878769 A US3878769 A US 3878769A
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US
United States
Prior art keywords
ram
spring
seats
arm structure
sleeve part
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
Application number
US367764A
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English (en)
Inventor
Stanley F Farmer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cascade Corp
Original Assignee
Cascade Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Cascade Corp filed Critical Cascade Corp
Priority to US367764A priority Critical patent/US3878769A/en
Priority to GB2243774A priority patent/GB1438255A/en
Priority to CA200,372A priority patent/CA998968A/en
Priority to DE7419226U priority patent/DE7419226U/de
Priority to JP6381774A priority patent/JPS5413066B2/ja
Priority to DE2426895A priority patent/DE2426895C3/de
Priority to FR7419626A priority patent/FR2232506B1/fr
Application granted granted Critical
Publication of US3878769A publication Critical patent/US3878769A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/12—Platforms; Forks; Other load supporting or gripping members
    • B66F9/18—Load gripping or retaining means
    • B66F9/184—Roll clamps

Definitions

  • the ram has a rod assembly including a sleeve part and a rod part received within the sleeve part.
  • a coiled compression spring within the sleeve part and interposed between spring seats which are axially displaceable on the rod part urges said spring seats apart toward a position of maximum relative axial spacing defined on the rod part.
  • the rod part is relatively displaceable axially of the sleeve part with compression of said spring for a limited distance.
  • This invention concerns clamping mechanism of the type comprising opposed clamping arm structures mounted on a frame. which are brought together to clamp onto the sides of a load.
  • the clamping mechanism may form an attachment for a lift truck. as the means employed for lifting up the load which is to be transported by the truck.
  • a general object of the invention is to provide improved load clamping mechanism having opposed arm structures for clamping onto a load. wherein one or preferably both arm structures in the mechanism have forward ends permitted limited swinging to facilitate arm positioning in picking up a load.
  • an object of the invention is to provide clamping mechanism including opposed arm structures for pickup of a load. wherein such swinging movement is obtained by providing a limited amount of contractibility and extensibility in the fluid-powered ram which is included for actuating the arm. which movement is independent of any change in the length of the ram produced by reason of fluid-powered actuation of the ram. This limited movement is resisted by a coiled compression spring which serves to maintain relatively extensible parts in the ram in a position intermediate fully relatively extended and fully relatively contracted positions.
  • a more specific object of the invention is to provide clamping mechanism of the type indicated. which includes a pivoted clamping arm which is swung to move it toward and away an opposed arm to effect clamping onto and release of a load. and a fluidpowered ram actuated to produce powered movement of the arm.
  • the ram including a rod assembly with relatively extensible and contractible parts and a coiled compression spring held internally in the rod assembly maintaining such parts in a position intermediate fully relatively extended and fully relatively contracted positions.
  • FIG. 1 is a plan view showing a roll clamp constructed according to the invention with such mounted on forward portions of a lift truck;
  • FIG. 2 is a view. on a larger scale. illustrating a fluidpowered ram used in actuating a clamping arm structure in the roll clamp shown in FIG. 1.
  • the load clamping mechanism illustrated comprises a roll clamp 10 including a pair of opposed clamping arm structures or arms. shown at 12 and 14, mounted on a frame 16.
  • the roll clamp comprises an attachment for a lift truck. portions of which are shown at 20.
  • the roll clamp includes a rotator 22 which. as is conventional in the art. is utilized to rotate or turn the frame 16 and the arms mounted thereon about an axis extending substantially horizontally and along the longitudinal axis of the truck.
  • the roll clamp With the roll clamp positioned as illustrated in FIG. 1, i.e.. with the arm structures projecting forwardly from either side of the truck. the roll clamp may be utilized in the picking up of rolls that are resting on end on the floor.
  • the roll clamp is mounted on a vertically movable carriage 24 disposed in front of a conventional extensible mast assembly 26. With raising of the carriage the roll clamp is raised to lift the load gripped thereby.
  • Each of the arm structures l2. 14 is mounted adjacent its rear end on frame 16 through a pivot means 28.
  • the pivot means permits an arm structure to be swung toward and away from an opposing arm structure. to permit the clamping onto and the release of a roll.
  • the roll clamp thus falls into a class generally known as a bear hug" type clamp. in that movement of the arm structures toward and away from each other is produced by swinging pivotally mounted arm structures. Adjusted pivotal movement of each arm structure is produced under power. through the actuation of one or more fluid-powered rams interposed between an arm structure and the frame 16, exemplified by the ram 30 shown for arm structure 12 and ram 32 shown for arm structure 10.
  • Each of these rams has its cylinder end pivotally mounted on the frame. as at 34, and its rod end pivotally mounted on an arm structure. as at 36.
  • Each of the rams which is provided to actuate a clamping arm structure may be constructed as described in connection with ram 32 illustrated on a somewhat larger scale in FIG. 2.
  • ram 32 includes a cylinder 40 closed at which is referred to herein as the cylinder end of the ram by an end wall 42 which mounts car 44 forming part of pivot means 34.
  • a rod assembly 50 including piston 52 and rod 54.
  • the rod assembly projects outwardly from the right end of the cylinder 40 through a retainer 56.
  • the rod assembly at the extreme right end thereof in FIG. 2 includes an car 58 at what is referred to as the rod end of the ram forming part of pivot means 36.
  • piston 52 moves between limit positions defined by end wall 42 and retainer 56 at the opposite end of the cylinder. Encircling the piston is a bearing 60. Providing a dynamic seal between the piston and the inner wall of cylinder 40 is seal assembly 62.
  • Rod assembly 50 of ram 32 comprises relatively axially displaceable rod parts in the form of a sleeve 64 and a rod element 66.
  • Sleeve 64 has its left end secured, as by welding. to piston 52.
  • the right end of the sleeve in FIG. 2 extends through retainer 56.
  • a seal assembly 68 provides a fluid-tight seal between the retainer and the periphery of the sleeve.
  • rod element 66 is formed with a pair of axially spaced annular channels shown at 70 and 72, respectively.
  • a spring seat 74 Mounted in channel 70 is what is referred to herein as a spring seat 74.
  • the spring seat is axially displaceable with respect to the rod element between shoulder 76 defining one limit position on one side of channel 70 and shoulder 78 on the other side of the channel defining a second limit position.
  • another spring seat 80 Seated within channel 72 and also relatively axially displaceable with respect to the rod element is another spring seat 80.
  • Such spring seat is afforded limited axial movement with respect to the rod element between a shoulder 82 defining one limit position and on one side of the channel 72, and a shoulder 84 on the other side of the channel defining a second limit position.
  • a coiled compression spring 86 Encircling the rod element and with ends seated on spring seat 74, 80 is a coiled compression spring 86. The spring exerts a constant bias on the spring seats tend
  • a spacer 90 Mounted within sleeve 64 adjacent the left end of the sleeve in FIG. 2 is a spacer 90.
  • the right end of the spacer in FIG. 2 constitutes an abutment means positioning spring seat 74 in a predetermined position with respect to sleeve 64 with spring seats 74, 80 spread apart and against shoulders 76, 82, as illustrated.
  • a retainer 92 Mounted within the right end of sleeve 64 is a retainer 92.
  • the left end of this retainer constitutes an abutment means defining a predetermined position for the spring seat 80 with the spring seats in this spread-apart condition just described.
  • ram 32 has a limited amount of extensibility and contractibility which is resisted by coiled spring 86 and which is independent of extensibility or contractibility obtained by actuation of the ram through controlled supply of pressurefluid to the ram.
  • lt is this limited extensibility and contractibility which permits an arm structure powered by the ram to swing in or out to a limited degree, as in response to striking an obstruction, without any change in the relative position of the piston within the cylinder.
  • the construction is such that rod element 66 is always biased by the spring to a position intermediate a fully extended and a fully contracted position relative to sleeve 64.
  • rod element 66 is displaceable to the left with respect to sleeve 64.
  • This movement to the left is accompanied with movement of spring seat to the left with such spring seat abutted against shoulder 82.
  • Spring seat 74 is pre vented from moving by reason of seating against the right end of spacer 90.
  • this movement to the left is accompanied with deformation of spring 86, more specifically a further compressing of the spring. Movement to the left is limited by shoulder 78 coming up against the right side of spring seat 74.
  • the rod element can extend from the sleeve 64 for a limited distance, such also being accompanied with compression of spring 86.
  • spring seat 74 moves to the right while abutted against shoulder 76.
  • Spring seat 80 remains in place against retainer 92.
  • Hoses for the supply and exhaust of pressure fluid to the ram.
  • Hose 102 through passage 104 and tube 106 connects with the left end of the cylinder 40 in FIG. 2.
  • Hose 100 through passage 108 connects with the right end of the cylinder 40.
  • fluid under pressure such as hydraulic fluid is admitted to the left end of the cylinder and is permitted to exhaust from the right end.
  • fluid under pressure is admitted to the right end of the cylinder and permitted to exhaust from the left end, in a conventional manner.
  • Suitable valve means (not shown) is provided to enable an operator to make controlled adjustments in the length of the ram.
  • arm structure 10 in dashed outline 10A is shown deflected inwardly from the position shown in solid outline for the arm structure.
  • This inward movement of the arm structure is accompanied with extension of the overall length of ram 32.
  • This movement is afforded the clamping arm structure without hydraulic actuation of ram 32 with rod element 66 moving outwardly from sleeve 64.
  • the arm structure may swing to the right or to the position shown at 10B in dashed outline, with contraction of the ram and without hydraulic actuation thereof, with rod element 66 moving inwardly into sleeve 64.
  • clamping mechanism described permits an operator to handle loads with less skill and exactness required in positioning the arm structures prior to picking up a load.
  • the arm structures may move in and out to a a limited degree, as the result of striking an adjacent obstruction or prematurely engaging the roll which is to be picked up.
  • the limited amount of play permitted in each arm structure is accomplished in a relatively simple manner, i.e., in permitting limited extensibility and contractibility in the ram which powers movement of an arm structure.
  • a roll clamp including a swingable clamping arm structure which is pivotally mounted on a frame for swinging movement relative thereto thus to clamp onto a load a fluid-operated ram interposed between the frame and arm structure operable, on actuation. to produce adjusted swinging movement of the arm structure.
  • said ram including a cylinder and a piston rod assembly with the piston rod assembly extensible from the cylinder.
  • said piston rod assembly including a rod part telescopically received within a sleeve part, a pair of axially spaced spring seats encircling the rod part and mounted thereon for axial movement therealong each spring seat being movable axially between a pair of limit positions defined on the rod part a coiled compression spring interposed between the spring seats urging said seats apart to a position of maximum relative axial spacing, and means on the sleeve part positioning said spring seats with respect to the sleeve part with the seats in said position of maximum relative axial spacing.
  • load clamping mechanism including a frame and a pair of opposed arm structures mounted on said frame actuatable to clamp onto a load.
  • a fluid-powered ram for actuating atleast one arm structure including a piston rod assembly and a cylinder that are extendable and contractible with respect to'each other on operation of the ram,
  • said rod assembly comprising a sleeve element and an extensible rod element received within said sleeve element.
  • said rod element having a pair of axially spaced spring seats mounted thereon which are axially displaceable with respect to the rod element,
  • a coiled compression spring encircling the rod element interposed between said spring seats to spread them apart said rod element further including limit means defining limit positions thereon for said spring seats.
  • the sleeve element including abutment means positioning the spring seats in a predetermined position relative to the sleeve element with said spring seats spread apart against said limit means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Manipulator (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Actuator (AREA)
US367764A 1973-06-07 1973-06-07 Load clamping mechanism with limited play in arms Expired - Lifetime US3878769A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US367764A US3878769A (en) 1973-06-07 1973-06-07 Load clamping mechanism with limited play in arms
GB2243774A GB1438255A (en) 1973-06-07 1974-05-20 Load clamping mechanism with limited play in arms
CA200,372A CA998968A (en) 1973-06-07 1974-05-21 Load clamping mechanism with limited play in arms
DE7419226U DE7419226U (de) 1973-06-07 1974-06-04 Vorrichtung zum greifen einer last
JP6381774A JPS5413066B2 (de) 1973-06-07 1974-06-04
DE2426895A DE2426895C3 (de) 1973-06-07 1974-06-04 Vorrichtung zum Greifen einer Last
FR7419626A FR2232506B1 (de) 1973-06-07 1974-06-06

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US367764A US3878769A (en) 1973-06-07 1973-06-07 Load clamping mechanism with limited play in arms

Publications (1)

Publication Number Publication Date
US3878769A true US3878769A (en) 1975-04-22

Family

ID=23448499

Family Applications (1)

Application Number Title Priority Date Filing Date
US367764A Expired - Lifetime US3878769A (en) 1973-06-07 1973-06-07 Load clamping mechanism with limited play in arms

Country Status (6)

Country Link
US (1) US3878769A (de)
JP (1) JPS5413066B2 (de)
CA (1) CA998968A (de)
DE (2) DE2426895C3 (de)
FR (1) FR2232506B1 (de)
GB (1) GB1438255A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4227445A (en) * 1978-09-29 1980-10-14 Schmelzer Corporation Motor with multiple output members
US4258611A (en) * 1979-05-14 1981-03-31 Schmelzer Corporation Vacuum motor for carburetors
US4440068A (en) * 1981-03-19 1984-04-03 Pneumo Corporation Hydraulic cowl door actuator with anti-vibration loading device, and assembly employing same
US4573858A (en) * 1984-02-16 1986-03-04 Long Reach Manufacturing Co. Clamping attachment for a lift truck having two pivoting arms
US4667574A (en) * 1984-10-31 1987-05-26 The Goodyear Tire & Rubber Company Actuator for movement of a tool and a tire carcass transfer device utilizing the actuator
US5301598A (en) * 1990-12-06 1994-04-12 Sms Schloemann-Siemag Aktiengesellschaft Piston-cylinder unit for producing and transmitting compressive forces
ITPR20100055A1 (it) * 2010-06-15 2011-12-16 A C S S R L Martinetto e dispositivo di movimentazione di un corpo cedevole comprendente detto martinetto
CN103950029A (zh) * 2014-04-28 2014-07-30 安徽工业大学 机械式自动夹紧抓手
US10954974B2 (en) * 2017-10-20 2021-03-23 Hamilton Sunstrand Corporation Actuator assembly with lost motion device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5318772U (de) * 1976-07-27 1978-02-17
CN103495985A (zh) * 2013-10-24 2014-01-08 太仓市高泰机械有限公司 一种简易防滑机械手

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2527727A (en) * 1946-07-03 1950-10-31 Hobbs Transmission Ltd Power transmission apparatus
US2966888A (en) * 1956-05-23 1961-01-03 Ford Motor Co Transmission control servo
US3034483A (en) * 1960-12-08 1962-05-15 Honeywell Regulator Co Hydraulic servomotor
US3168854A (en) * 1963-05-22 1965-02-09 Gardner Machines Inc Feedworks and improvements therein
US3741517A (en) * 1971-02-09 1973-06-26 Texaco Inc Subterranean clamping mechanism for submarine wells

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2785140A (en) * 1951-03-29 1957-03-12 Exxon Research Engineering Co Methods of making silica-alumina catalysts
US3407951A (en) * 1967-06-19 1968-10-29 Cascade Corp Load clamp with arm travel retarding means

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2527727A (en) * 1946-07-03 1950-10-31 Hobbs Transmission Ltd Power transmission apparatus
US2966888A (en) * 1956-05-23 1961-01-03 Ford Motor Co Transmission control servo
US3034483A (en) * 1960-12-08 1962-05-15 Honeywell Regulator Co Hydraulic servomotor
US3168854A (en) * 1963-05-22 1965-02-09 Gardner Machines Inc Feedworks and improvements therein
US3741517A (en) * 1971-02-09 1973-06-26 Texaco Inc Subterranean clamping mechanism for submarine wells

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4227445A (en) * 1978-09-29 1980-10-14 Schmelzer Corporation Motor with multiple output members
US4258611A (en) * 1979-05-14 1981-03-31 Schmelzer Corporation Vacuum motor for carburetors
US4440068A (en) * 1981-03-19 1984-04-03 Pneumo Corporation Hydraulic cowl door actuator with anti-vibration loading device, and assembly employing same
US4573858A (en) * 1984-02-16 1986-03-04 Long Reach Manufacturing Co. Clamping attachment for a lift truck having two pivoting arms
US4667574A (en) * 1984-10-31 1987-05-26 The Goodyear Tire & Rubber Company Actuator for movement of a tool and a tire carcass transfer device utilizing the actuator
US5301598A (en) * 1990-12-06 1994-04-12 Sms Schloemann-Siemag Aktiengesellschaft Piston-cylinder unit for producing and transmitting compressive forces
ITPR20100055A1 (it) * 2010-06-15 2011-12-16 A C S S R L Martinetto e dispositivo di movimentazione di un corpo cedevole comprendente detto martinetto
CN103950029A (zh) * 2014-04-28 2014-07-30 安徽工业大学 机械式自动夹紧抓手
CN103950029B (zh) * 2014-04-28 2015-12-09 安徽工业大学 机械式自动夹紧抓手
US10954974B2 (en) * 2017-10-20 2021-03-23 Hamilton Sunstrand Corporation Actuator assembly with lost motion device

Also Published As

Publication number Publication date
FR2232506B1 (de) 1978-11-17
JPS5021453A (de) 1975-03-07
FR2232506A1 (de) 1975-01-03
DE2426895C3 (de) 1980-10-09
DE7419226U (de) 1977-09-22
DE2426895A1 (de) 1975-01-02
CA998968A (en) 1976-10-26
DE2426895B2 (de) 1980-02-21
JPS5413066B2 (de) 1979-05-28
GB1438255A (en) 1976-06-03

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