US3282566A - Scissors operating linkage - Google Patents

Scissors operating linkage Download PDF

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Publication number
US3282566A
US3282566A US368249A US36824964A US3282566A US 3282566 A US3282566 A US 3282566A US 368249 A US368249 A US 368249A US 36824964 A US36824964 A US 36824964A US 3282566 A US3282566 A US 3282566A
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cylinder
legs
piston
linkage
axis
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US368249A
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Jesse E Clarke
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Autoquip Corp
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Autoquip Corp
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B9/00—Tables with tops of variable height
    • A47B9/18—Tables with tops of variable height with additional top or additional legs for varying the height of the top
    • 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
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
    • B66F7/065—Scissor linkages, i.e. X-configuration
    • 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
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
    • B66F7/08—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement hydraulically or pneumatically operated

Definitions

  • This invention relates to the operation of a scissors lift in changing it from a down or closed position to up or open position. It is particularly employed in connectio with lift tables and the like.
  • a completely closed scissors linkage on lift equipment is ordinarily pried open and is extended through the use of cams or rollers.
  • a component of force is obtained on the mounting points with the -component being norm-al to the axis of the cylinder. This component is employed to open the closed scissors linkage.
  • a principal object of the invention is therefore to eliminate the extra cams, or rollers, etc., normally employed to start the movement of a scissors lift from the closed position.
  • a simple hydraulic cylinder is employed for all phases of the lifting or operation of the scissors linkage.
  • FIG. 1 is an elevation, partly in section as taken on the line 1-1 of FIG. 2 of a scissors lift and eccentrically loaded power cylinders in accordance with this invention, as applied to a raisable lift table in its up position;
  • FIG. 2 is a sectional view of FIG. 1 as taken on a line 2 2 of FIG. 1;
  • FIG. 3 is a sectional view, showing the pa-rts of FIG. 2 in partially lowered position
  • FIG. 4 is a sectional view of the table and its parts in the closed or down position.
  • a lift table with a completely closed scissors linkage is raised by one or more hydraulic cylinders, depending upon the lifting force necessary, without the use of pryers, cams, or power rollers.
  • the cylinders are mounted eccentrically to the crossed legs and a sufi-lcient force is generated to open or raise the closed linkage by a direct thrust made possible by the offset position of the cylinder mountings with respect to the cylinder axis.
  • the cylinder mountings should be offset by a distance greater than the internal diameter of the hydraulic cylinder.
  • the invention comprises a lift table having a top and a base 12 connected by crossed scissors legs 14 and 16 at each side. Legs 14 and 16 are pivotally connected at 18.
  • the base 12 is in the form of an o-pen shallow box or receptacle having upright sides 20, and the top 10 lits ice down closely upon the sides enclosing all the operating parts, as shown in FIG. 4.
  • a plate 21 Depending from the top, at each side, is a plate 21.
  • a pivot 22 near one end of the plate 21 connects the upper end of the leg 14 to the plate.
  • Leg 14 has a roller 24 rotatably mounted at the other end on shaft 25. Roller 24 rides on the upper surface of a strip 26 in the bottom of one side of the base 12.
  • One end of the other leg 16 has a pivot 28 connecting it to a support block 29 directly below the pivot 22 for the leg 14.
  • a roller 30 mounted on shaft 31 at the other end of leg 16 rides on the under side of the table top 10. The legs are closely folded together by the pivot 18 intermediate their ends, for parallel scissor action between the base and the top.
  • a cross piece 34 which may be in the form of an angle bar having one web 36 extending across the bottom ends of legs 14 with a shorter web 37 normal thereto.
  • a second and shorter angle bar 38 has two webs 40 and 44.
  • Web 40 is pivotally connected to web 36 by studs 42 projecting from web 40 and extending through openings in web 36. Additional pistons and cylinders may be employed as suggested by the dot-dash lines.
  • a reinforcing plate 46 is employed in angle 38 at the point where a piston is secured.
  • the outer end of piston 48 of hydraulic cylinder 50 is secured to ⁇ web 44.
  • angle 38 provides for a somewhat exible movement of the outer ends of the pistons 48, with an effective mounting point (e.g. 42) for the application of pressure.
  • This mounting point is oifset at one side of the piston axis and is below the center line of the legs 12.
  • Cylinder 50 has a side mounting plate 52 pivotally mounted on a rod 54.
  • Rod 54 extends between the two opposite legs 16 to which it is connected. It is located at the side of the cylinder 50 opposite the pivotal mountings formed by studs 42. This rod 54 is at the upper side of the legs 16 above the common pivot 18 for the legs (FIGURE 4), and the mountings 52 extend downwardly. In the down position the cylinders will be entirely below the upper edges of the legs 16 to which they are connected.
  • the line 62 which connects the rod 54 and the studs 42 for the hydraulic cylinder is angularly disposed with respect to the axis 63 of the cylinder.
  • Line 62 also is at an angle to the longitudinal axes of legs 14 and 16 when the scissors linkage is closed.
  • the pivotal mountings formed by studs 42 and rod 54 for the hydraulic cylinder should be offset from the axis 63 of the cylinder an amount that is greater than the internal diameter of the cylinder 50 (or the external diameter of the piston).
  • each cylinder 50 is provided with an inlet 60 near its outer end to which some suitable connection (not shown) is made. Adjacent the other end is a pipe 61 which may be used as an exhaust, or connected to the pressure source through a suitable valving arrangement if the cylinder is to be double acting.
  • each 4 said mounting is -oiset to one side of a line extending between said two pivotal connections on the yleg associfated with said mounting.

Description

Nv. 1, 1966 J. E. CLARKE SCISSORS OPERATING LINKAGE Filed May 18, 1964 United States Patent O 3,282,566 SCISSORS OPERATING LINKAGE Jesse E. Clarke, Hinsdale, Ill., assignor to Autoquip Corporation, Chicago, Ill., a corporation of Illinois Filed May 18, 1964, Ser. No. 368,249 2 Claims. (Cl. 254-122) This invention relates to the operation of a scissors lift in changing it from a down or closed position to up or open position. It is particularly employed in connectio with lift tables and the like.
As previously used, a completely closed scissors linkage on lift equipment is ordinarily pried open and is extended through the use of cams or rollers. In the present invention, by mounting a hydraulic cylinder so that the mounting points are substantially offset from the axis of the cylinder, a component of force is obtained on the mounting points with the -component being norm-al to the axis of the cylinder. This component is employed to open the closed scissors linkage.
A principal object of the invention is therefore to eliminate the extra cams, or rollers, etc., normally employed to start the movement of a scissors lift from the closed position. A simple hydraulic cylinder is employed for all phases of the lifting or operation of the scissors linkage.
Other objects of the invention are: t-o provide a sleeve type operating cylinder having a direct thrust with eccentric bearings; to provide for a significant thrust component offset from the cylinder axis for breaking the scissors linkage open; and in general, to provide a more simple and eicient direct thrust lifting mechanism for this linkage.
Other objects of the invention will appear in the specication and will be apparent from the accompanying drawings, in which:
FIG. 1 is an elevation, partly in section as taken on the line 1-1 of FIG. 2 of a scissors lift and eccentrically loaded power cylinders in accordance with this invention, as applied to a raisable lift table in its up position;
FIG. 2 is a sectional view of FIG. 1 as taken on a line 2 2 of FIG. 1;
FIG. 3 is a sectional view, showing the pa-rts of FIG. 2 in partially lowered position; and
FIG. 4 is a sectional view of the table and its parts in the closed or down position.
Although the following disclosure offered for public dissemination is detailed to ensure adequacy and aid understanding, this is not intended to prejudice that purpose of a patent which is to cover each new inventive concept therein no matter how others may latter disguise it by variations in form or additions or further improvements. The claims at the end hereof are intended as the chief aid toward this purpose; as it is these that meet the requirement of pointing out the parts, improvements, or combinations in which the inventive concepts are found.
In this invention, a lift table with a completely closed scissors linkage is raised by one or more hydraulic cylinders, depending upon the lifting force necessary, without the use of pryers, cams, or power rollers. The cylinders are mounted eccentrically to the crossed legs and a sufi-lcient force is generated to open or raise the closed linkage by a direct thrust made possible by the offset position of the cylinder mountings with respect to the cylinder axis. To achieve the required operation the cylinder mountings should be offset by a distance greater than the internal diameter of the hydraulic cylinder.
Referring now more particularly to the drawings, the invention comprises a lift table having a top and a base 12 connected by crossed scissors legs 14 and 16 at each side. Legs 14 and 16 are pivotally connected at 18. As shown, the base 12 is in the form of an o-pen shallow box or receptacle having upright sides 20, and the top 10 lits ice down closely upon the sides enclosing all the operating parts, as shown in FIG. 4.
Depending from the top, at each side, is a plate 21. A pivot 22 near one end of the plate 21 connects the upper end of the leg 14 to the plate. Leg 14 has a roller 24 rotatably mounted at the other end on shaft 25. Roller 24 rides on the upper surface of a strip 26 in the bottom of one side of the base 12. One end of the other leg 16 has a pivot 28 connecting it to a support block 29 directly below the pivot 22 for the leg 14. A roller 30 mounted on shaft 31 at the other end of leg 16 rides on the under side of the table top 10. The legs are closely folded together by the pivot 18 intermediate their ends, for parallel scissor action between the base and the top.
Attached to the roller ends of the outer legs 14 is a cross piece 34 which may be in the form of an angle bar having one web 36 extending across the bottom ends of legs 14 with a shorter web 37 normal thereto. A second and shorter angle bar 38 has two webs 40 and 44. Web 40 is pivotally connected to web 36 by studs 42 projecting from web 40 and extending through openings in web 36. Additional pistons and cylinders may be employed as suggested by the dot-dash lines. A reinforcing plate 46 is employed in angle 38 at the point where a piston is secured. The outer end of piston 48 of hydraulic cylinder 50 is secured to `web 44. The mounting of angle 38 to angle 36 provides for a somewhat exible movement of the outer ends of the pistons 48, with an effective mounting point (e.g. 42) for the application of pressure. This mounting point is oifset at one side of the piston axis and is below the center line of the legs 12.
Cylinder 50 has a side mounting plate 52 pivotally mounted on a rod 54. Rod 54 extends between the two opposite legs 16 to which it is connected. It is located at the side of the cylinder 50 opposite the pivotal mountings formed by studs 42. This rod 54 is at the upper side of the legs 16 above the common pivot 18 for the legs (FIGURE 4), and the mountings 52 extend downwardly. In the down position the cylinders will be entirely below the upper edges of the legs 16 to which they are connected.
In FIGURE 4, it will be seen that the line 62 which connects the rod 54 and the studs 42 for the hydraulic cylinder is angularly disposed with respect to the axis 63 of the cylinder. Line 62 also is at an angle to the longitudinal axes of legs 14 and 16 when the scissors linkage is closed. The pivotal mountings formed by studs 42 and rod 54 for the hydraulic cylinder should be offset from the axis 63 of the cylinder an amount that is greater than the internal diameter of the cylinder 50 (or the external diameter of the piston).
With reference to FIGURE 4 it will be seen that as pist-on 48 is forced out of cylinder 50 a vertical component of this force is developed upwardly at the pivotal mounting of the cylinder on rod 54. This vertical cornponent will break the scissors linkage open from the FIGURE 4 position and start the table moving upwardly.
It is necessary to have the -best possible running lit between piston 48 and cylinder 50. A bearing surface of Teflon (polymerized tetrafluoro ethylene) plastic has been found to be most suitable. An ideal method for forming a bearing that is suitable is disclosed in Patent 3,061,887. The eccentric mounting of the cylinders results in twisting and side loads on the piston which would damage the inner cylinder walls if not properly protected.
To supply air or fluid pressure, each cylinder 50 is provided with an inlet 60 near its outer end to which some suitable connection (not shown) is made. Adjacent the other end is a pipe 61 which may be used as an exhaust, or connected to the pressure source through a suitable valving arrangement if the cylinder is to be double acting.
-I claim:
1. In a lift table having a base and a top connected by a scissor linkage comprising at least two legs pivotally connected intermediate their ends and with one end of one leg pivotally connected to the top and one end of the other end pivotally connected to the base and hydr-aulic means including a cylinder and piston connected for controlling the angular position of the legs with respect to each other, which linkage is of the type that may be collapsed to the extent that the two legs are substantially parallel, the improvement comprising, a rst pivotal mounting connection on the cylinder and =a second pivotal mounting connection on the piston, said connections being spaced `apart in a direction at right angles to the axis of the cylinder a distance greater than the internal diameter l5 of the cylinder, whereby extension of the piston from rthe cylinder will create a force component at the connections in a direction normal to the axis of the cylinder.
2. In a lift table as set forth in claim 1 wherein each 4 said mounting is -oiset to one side of a line extending between said two pivotal connections on the yleg associfated with said mounting.
References Cited by the Examiner UNITED STATES PATENTS 2,5 01,001 3/ 1950 Neely 254-122 2,704,221 3/11955 Gwinn.
3,032,319 5/1962 Dale 25A-122 FOREIGN PATENTS 1,306,404 9/196-2 France.
1,348,093 2/ 1963 France.
. 204,328 10/1939 Switzerland.
EvoN C. BLUNK, Primary Examiner.
H. C. HORNSBY, Assistant Examiner.

Claims (1)

1. IN A LIFT TABLE HAVING A BASE AND A TOP CONNECTED BY A SCISSOR LINKAGE COMPRISING AT LEAST TWO LEGS PIVOTALLY CONNECTED INTERMEDIATE THEIR ENDS AND WITH ONE END OF ONE LEG PIVOTALLY CONNECTED TO THE TOP AND ONE END OF THE OTHER END PIVOTALLY CONNECTED TO THE BASE AND HYDRAULIC MEANS INCLUDING A CYLINDER AND PISTON CONNECTED FOR CONTROLLING THE ANGULAR POSITION OF THE LEGS WITH RESPECT TO EACH OTHER, WHICH LINKAGE IS OF THE TYPE THAT MAY BE COLLAPSED TO THE EXTEND THAT THE TWO LEGS ARE SUBSTANTIALLY PARALLEL, THE IMPROVEMENT COMPRISING, A FIRST PIVOTAL MOUNTING CONNECTION ON THE CYLINDRICAL AND A SECOND PIVOTAL MOUNTING CONNECTION ON THE PISTON, SAID CONNECTIONS BEING SPACED APART IN A DIRECTION AT RIGHT ANGLES TO THE AXIS OF THE CYLINDER A DISTANCE GREATER THAN THE INTERNAL DIAMETER THE CYLINDER, WHEREBY EXTENSION OF THE PISTON FROM THE CYLINDER WILL CREATE A FORCE COMPONENT AT THE CONNECTIONS IN A DIRECTION NORMAL TO THE AXIS OF THE CYLINDER.
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US3478897A (en) * 1967-10-12 1969-11-18 Fmc Corp Pallet stacking apparatus
US3558103A (en) * 1966-09-26 1971-01-26 Alois Lodige Scissor action hoist with components shaped so as to nest within one another
US3624782A (en) * 1969-04-14 1971-11-30 Aircraft Mechanics Semiautomatic palletizer
US3628771A (en) * 1969-07-28 1971-12-21 Haakon G Egeland Scissors-type lifting linkage elevator
US3686696A (en) * 1970-01-07 1972-08-29 American Hospital Supply Corp Hospital beds
US3760436A (en) * 1971-11-05 1973-09-25 Universal Oil Prod Co Suspension system for vehicle mounted bed
US4092011A (en) * 1977-06-03 1978-05-30 Moore & Sons, Inc. Lift mechanism for a truck
US4147124A (en) * 1977-09-26 1979-04-03 The United States Of America As Represented By The Secretary Of The Navy Apparatus for launching stores from a submerged vehicle
US4148264A (en) * 1977-06-08 1979-04-10 Diomedes Caravias Table having multiple table top elevations
US4165006A (en) * 1976-12-22 1979-08-21 Ugo Brusa Apparatus for grouping into bundles elongated objects, more particularly sections or flat rolled elements
US4238003A (en) * 1979-07-30 1980-12-09 Lee Hunter Vehicle lift rack
US4365692A (en) * 1980-12-04 1982-12-28 Loffland Brothers Company Elevating catwalk
US4451945A (en) * 1981-09-08 1984-06-05 Siemens Medical Laboratories, Inc. Medical couch
US4534544A (en) * 1982-10-16 1985-08-13 Flexlift Hubgerate GmbH Lift
US4556198A (en) * 1983-12-19 1985-12-03 Fuji Electric Co., Ltd. Height adjusting lifter for hospital bed
US4558648A (en) * 1983-09-20 1985-12-17 Lift-R Technologies, Inc. Energy-recycling scissors lift
US4558847A (en) * 1980-10-22 1985-12-17 Coates Management Pty. Ltd. Patient lifting table
US4858482A (en) * 1987-02-13 1989-08-22 Erik Knudsen Scissor mechanism in particular for lift tables
US4926760A (en) * 1989-01-27 1990-05-22 Sack Allen J Self leveling tables
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US20020125662A1 (en) * 2000-08-29 2002-09-12 Annop Magness Combination lifting, platform, handtruck, scaffold, floorjack and mechanic cleeper
US6470809B1 (en) * 1998-04-29 2002-10-29 Karl-Walter Herbert Adjustable holding device on board computers in motor vehicles, especially for a laptop or a notebook computer
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CH204328A (en) * 1938-04-07 1939-04-30 Efem S A Mobile hydraulic lift.
US2501001A (en) * 1947-02-10 1950-03-21 Don A Neely Linkage mechanism with two lifting phases
US2704221A (en) * 1950-05-27 1955-03-15 Gar Wood Ind Inc Offset cylinder and piston rod mounting for hydraulic dump bodies
US3032319A (en) * 1960-08-15 1962-05-01 Lamb Grays Harbor Co Inc Tray type scissors lift
FR1306404A (en) * 1961-11-16 1962-10-13 Maschinen Trepel Kg Improvements to hydraulic lift tables
FR1348093A (en) * 1963-02-08 1964-01-04 Improvements to tables and lifting platforms and similar devices

Cited By (104)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3558103A (en) * 1966-09-26 1971-01-26 Alois Lodige Scissor action hoist with components shaped so as to nest within one another
US3478897A (en) * 1967-10-12 1969-11-18 Fmc Corp Pallet stacking apparatus
US3624782A (en) * 1969-04-14 1971-11-30 Aircraft Mechanics Semiautomatic palletizer
US3628771A (en) * 1969-07-28 1971-12-21 Haakon G Egeland Scissors-type lifting linkage elevator
US3686696A (en) * 1970-01-07 1972-08-29 American Hospital Supply Corp Hospital beds
US3760436A (en) * 1971-11-05 1973-09-25 Universal Oil Prod Co Suspension system for vehicle mounted bed
US4165006A (en) * 1976-12-22 1979-08-21 Ugo Brusa Apparatus for grouping into bundles elongated objects, more particularly sections or flat rolled elements
US4092011A (en) * 1977-06-03 1978-05-30 Moore & Sons, Inc. Lift mechanism for a truck
US4148264A (en) * 1977-06-08 1979-04-10 Diomedes Caravias Table having multiple table top elevations
US4147124A (en) * 1977-09-26 1979-04-03 The United States Of America As Represented By The Secretary Of The Navy Apparatus for launching stores from a submerged vehicle
US4238003A (en) * 1979-07-30 1980-12-09 Lee Hunter Vehicle lift rack
US4558847A (en) * 1980-10-22 1985-12-17 Coates Management Pty. Ltd. Patient lifting table
US4365692A (en) * 1980-12-04 1982-12-28 Loffland Brothers Company Elevating catwalk
US4451945A (en) * 1981-09-08 1984-06-05 Siemens Medical Laboratories, Inc. Medical couch
US4534544A (en) * 1982-10-16 1985-08-13 Flexlift Hubgerate GmbH Lift
US4558648A (en) * 1983-09-20 1985-12-17 Lift-R Technologies, Inc. Energy-recycling scissors lift
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