USRE38233E1 - Weighing scale for moving loads - Google Patents

Weighing scale for moving loads Download PDF

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Publication number
USRE38233E1
USRE38233E1 US09/750,421 US75042100A USRE38233E US RE38233 E1 USRE38233 E1 US RE38233E1 US 75042100 A US75042100 A US 75042100A US RE38233 E USRE38233 E US RE38233E
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US
United States
Prior art keywords
trolley
track
weighing
section
transition support
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
US09/750,421
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English (en)
Inventor
David M. Vande Berg
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VBS Inc
Original Assignee
VBS Inc
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
Priority claimed from US08/874,402 external-priority patent/US5856637A/en
Application filed by VBS Inc filed Critical VBS Inc
Priority to US09/750,421 priority Critical patent/USRE38233E1/en
Application granted granted Critical
Publication of USRE38233E1 publication Critical patent/USRE38233E1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/14—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing suspended loads
    • G01G19/18—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing suspended loads having electrical weight-sensitive devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G23/00—Auxiliary devices for weighing apparatus
    • G01G23/005—Means for preventing overload

Definitions

  • This invention pertains to a weighing mechanism designed to provide a more accurate weight in less time than present systems.
  • Weighing systems for material suspended from a trolley rolling on a standing rail are fairly common. That material consists usually of meat carcasses, but may also include some other types of material. The purpose is to roll the trolley along the rail by the operation of a chain having a dog to engage the trolley to pull it over a short section of suspended track separated from the rest of the rail.
  • flat or out-of-round wheels can also contribute to a bouncing oscillation.
  • FIG. 1 is a front elevational view of the system at the region of the live track
  • FIG. 2 is a rear elevational view of the system
  • FIG. 3 is an elevational view axially of the track showing the end of the system
  • FIG. 4 is a plan view from line 4 — 4 of FIG. 2,
  • FIG. 5 is a detailed elevational view to an enlarged scale of the transition rail and its surrounding parts.
  • FIG. 6 is a top plan view of the parts shown in FIG. 5,
  • FIG. 7 is a sectional view from line 7 — 7 of FIG. 5, and
  • FIG. 8 is a view similar to FIG. 5 showing the parts just before the trolley is weighed.
  • this invention comprises a unique system of transmitting a trolley-suspended load from a fixed track to a live track for weighing the load. More specifically and referring to the drawings, the system includes a customary, basic, fixed track 10 on which trolleys 11 run.
  • the trolleys normally include a single wheel 12 journalled to a hanging strap 13 and ending in a hook 14 from which the load is hung.
  • the wheel 12 is grooved so that it will stay on the track 10 .
  • the trolley 11 is moved along the track 10 by a moving chain 15 linked to a series of arms 16 .
  • the arms 16 carry wheels 17 adapted to roll on a second track 18 parallel to but disposed above the carrying track 10 .
  • each arm 16 carries an engagement dog 19 at its lower end in position to engage each single trolley 11 .
  • the arm 16 by engagement between the dog 19 and the trolley 11 pushes the trolley along its track as required, but leaves the trolley to roll freely where the push is not required. This feature makes possible a feature of this invention which will be described later.
  • the weighing mechanism for weighing each trolley and its load as the trolley moves along the track, ordinarily includes a scale mechanism 20 mounted on a beam 23 .
  • the beam 23 is fixed to the track 10 so that a cut track will still have both ends supported.
  • the weighing mechanism is arranged to support a short section 25 of the track 10 which is cut from the track.
  • the support is from supports in the weighing mechanism which are carried by springs or strain gage devices of various kinds well known in the art.
  • the section 25 is simply cut from the track and catches the trolley wheel 12 from the fixed track 10 as the trolley rolls past.
  • the section 25 thus actuates the weighing mechanism.
  • the actuation is sudden and causes oscillating fluctuation of readings of weight.
  • the present invention provides a vast improvement by alleviating that problem.
  • a transitional piece 30 (FIGS. 1 and 2) is fastened to the fixed track near the entry side of the split track piece 25 at a pivot line.
  • the pivot 31 is formed simply by use of a spherical surface on top of a block 37 fixed to the track 10 .
  • the transition rail 30 rests on the spherical surface of the pivot line 31 and thus is free to rock on that surface.
  • a projection 32 is arranged to engage an opposite projection 33 on the weighing track section 25 .
  • a bolt 34 extending through an enlarged hole 35 may be used to keep the transitional piece from tipping laterally. However, the piece must be free to tilt about the pivot line 31 .
  • the pivot line 31 is always spaced longitudinally under the entry side of the track 10 , and below that track so that the pivot line 31 is always beneath the solid part of the track 10 and not the downward side of the space between the track 10 and the transition piece 30 . This is done with the purpose of avoiding an upward tilt of the transition piece 30 as the trolley first rolls onto it from the fixed track 10 . Because there will always be a downward moment of the weight of the trolley onto the transition piece 30 there will not be a reversal of rotation of that transition piece tending to cause a “hammering” effect as the transition piece moves from upward to downward. Such a “hammering” effect causes undesirable fluctuations on any scale reading as can readily be seen.
  • FIGS. 5-8 Although it is not essential to the operation of the weighing, a modification shown in FIGS. 5-8 is desirable for the sake of accuracy. Because the pivot line 31 is located either directly below or to the permanent track side of the division between the permanent track 10 and the transitional piece 30 , there is a small component of the weight of that transitional piece which will normally press onto the projection 33 of the weighing section 25 . To avoid what amounts to added tare weight on the scale, and because that weight might be somewhat variable, a way has been devised to keep that weight off the projection 33 of the weighing section 25 .
  • the plate 36 which also supports the pivot piece 37 includes a small shelf 38 .
  • the transition piece 30 also carries a corresponding shelf 39 .
  • a compression spring 50 which may be relatively soft extends between these shelves. The spring must be strong enough to raise the transition piece 30 from the projection 33 on the weighing section 25 but should not be much stronger than that. For example, it should not be strong enough to interfere more than minimally with the pressing down of the press 30 as it is loaded by the wheel 12 of the trolley.
  • the transit means includes a motor 40 which runs continuously.
  • An electrically operated clutch 41 controls the engagement between the motor 40 and an operating shaft 42 .
  • the engagement of the normally disengaged clutch may be controlled by any well known means for triggering an electrical device. That trigger might be a contact device arranged to be contacted by a strap 13 or an arm 16 , or it could be pressure switch triggered by the weight of the wheel 12 .
  • the preferred device may be an electric eye switch actuated by the straps 13 breaking a beam in passing. The switch when actuated operates to engage the clutch to drive the shaft 42 .
  • a sprocket 43 on the shaft 42 drives an auxiliary chain 44 (FIG. 3) which in turn drives a finger chain 45 in a horizontal plane.
  • This chain follows an elongated path between a driven sprocket at one end and an idler sprocket at the other end of the path, leaving a relatively straight run parallel to and relatively close to the underside of the weighing section 25 of the track 10 .
  • the chain carries two fingers 46 equally spaced on the finger chain 45 . These fingers are adapted to engage the strap 13 of the trolley to move it along the weighing section 25 of the track 10 , thus providing an auxiliary drive mechanism at this stage of the movement of the trolley. It will be noted that at any instant, the auxiliary drive will be engaged with only a single trolley.
  • the trolley 11 In operation, as the trolley 11 approaches the scale mechanism along the track 10 , it first triggers the electric engagement of the clutch drive 41 to cause the motor 40 to drive the finger chains 45 .
  • the proportions of the gears and sprockets is such that the lineal speed of the finger chain 45 is slightly greater than that of the main chain 15 so that upon engagement of a finger 46 with the strap 13 , the trolley is advanced ahead of and out of contact with the dog 19 that had been providing propulsion. Because the finger 46 is supported by the chain 45 and indirectly, therefore, by the rail 25 and is far closer to the wheel 12 than is the main chain 15 , there is no chance that there will be any resultant vertical component of force on the trolley 11 , transmitted to the sides.
  • auxiliary device will be more steady because only a single trolley is propelled instead of the multiplicity of trolleys being moved by the main chain. This added steadiness helps also to avoid the swinging and related oscillating movement existing in prior scale systems.
  • this invention provides a comparatively highly accurate and relatively fast system of weighing the moving trolleys and their load.
US09/750,421 1997-06-13 2000-12-29 Weighing scale for moving loads Expired - Lifetime USRE38233E1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US09/750,421 USRE38233E1 (en) 1997-06-13 2000-12-29 Weighing scale for moving loads

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/874,402 US5856637A (en) 1994-11-07 1997-06-13 Weighing scale for moving loads
US09/750,421 USRE38233E1 (en) 1997-06-13 2000-12-29 Weighing scale for moving loads

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US08/874,402 Reissue US5856637A (en) 1994-11-07 1997-06-13 Weighing scale for moving loads

Publications (1)

Publication Number Publication Date
USRE38233E1 true USRE38233E1 (en) 2003-08-26

Family

ID=25363666

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/750,421 Expired - Lifetime USRE38233E1 (en) 1997-06-13 2000-12-29 Weighing scale for moving loads

Country Status (2)

Country Link
US (1) USRE38233E1 (fr)
CA (1) CA2229237C (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030142790A1 (en) * 2000-10-06 2003-07-31 Zhou Otto Z. X-ray generating mechanism using electron field emission cathode
US20070050315A1 (en) * 2004-08-31 2007-03-01 Rabindran K G System for high-speed automatic weighing of items in a mail stream
US20090071730A1 (en) * 2007-09-17 2009-03-19 Bowe Bell + Howell Gmbh Apparatus for processing mail items and weighing module with settling section
US11162834B2 (en) * 2012-11-30 2021-11-02 Bace, Llc Weight-measurement retrofitting for waste compactors

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE150409C (fr) *
US2816643A (en) * 1953-07-13 1957-12-17 Mechanical Handling Sys Inc Work handling conveyor structure
US3960262A (en) * 1974-11-29 1976-06-01 American Chain & Cable Company, Inc. Accumulating conveyor
US4062414A (en) * 1976-11-22 1977-12-13 The Cincinnati Butchers' Supply Company Static weighing on conveyor
US4122940A (en) * 1975-11-03 1978-10-31 Optima-Maschinenfabrik, Dr. Buehler Kg Apparatus for the weighing of mass produced articles
US4344493A (en) * 1981-03-06 1982-08-17 Campbell Soup Company High-speed weighing and conveying apparatus
US4437561A (en) * 1981-03-03 1984-03-20 Yamato Scale Company, Ltd. Automatic continuous weighing machine
US4726435A (en) * 1985-05-16 1988-02-23 Tokyo Electric Co., Ltd. Load cell weighing apparatus
US5096007A (en) * 1989-05-09 1992-03-17 Mettler Toledo Ag Balance with overload protection
US5111896A (en) * 1990-04-20 1992-05-12 Baker Hughes Incorporated Belt conveyor weighbridge

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE150409C (fr) *
US2816643A (en) * 1953-07-13 1957-12-17 Mechanical Handling Sys Inc Work handling conveyor structure
US3960262A (en) * 1974-11-29 1976-06-01 American Chain & Cable Company, Inc. Accumulating conveyor
US4122940A (en) * 1975-11-03 1978-10-31 Optima-Maschinenfabrik, Dr. Buehler Kg Apparatus for the weighing of mass produced articles
US4062414A (en) * 1976-11-22 1977-12-13 The Cincinnati Butchers' Supply Company Static weighing on conveyor
US4437561A (en) * 1981-03-03 1984-03-20 Yamato Scale Company, Ltd. Automatic continuous weighing machine
US4344493A (en) * 1981-03-06 1982-08-17 Campbell Soup Company High-speed weighing and conveying apparatus
US4726435A (en) * 1985-05-16 1988-02-23 Tokyo Electric Co., Ltd. Load cell weighing apparatus
US5096007A (en) * 1989-05-09 1992-03-17 Mettler Toledo Ag Balance with overload protection
US5111896A (en) * 1990-04-20 1992-05-12 Baker Hughes Incorporated Belt conveyor weighbridge

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030142790A1 (en) * 2000-10-06 2003-07-31 Zhou Otto Z. X-ray generating mechanism using electron field emission cathode
US20070050315A1 (en) * 2004-08-31 2007-03-01 Rabindran K G System for high-speed automatic weighing of items in a mail stream
US7271352B2 (en) * 2004-08-31 2007-09-18 Rabindran K George System for high-speed automatic weighing of items in a mail stream
US20090071730A1 (en) * 2007-09-17 2009-03-19 Bowe Bell + Howell Gmbh Apparatus for processing mail items and weighing module with settling section
US7858889B2 (en) * 2007-09-17 2010-12-28 Bowe Bell & Howell Company Apparatus for processing mail items and weighing module with settling section
US11162834B2 (en) * 2012-11-30 2021-11-02 Bace, Llc Weight-measurement retrofitting for waste compactors

Also Published As

Publication number Publication date
CA2229237C (fr) 2006-01-31
CA2229237A1 (fr) 1998-12-13

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