# US 4,930,348 A · Vertical balancing machine with cartridge assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,930,348 A - Document ID: US4930348A - Status: Granted - Kind: A - Application number: 07/276,027 - Filed: 1988-11-25 - Granted: 1990-06-05 - Earliest claimed: 1988-11-25 - Assignees: Balance Engineering Corporation - Inventors: Deb K. Bandhopadhyay; Thomas A. Greenlees; David L. Rubbelke - Web page: https://patentgrep.com/patent/US4930348A ## CPC - G01M 1/04: Adaptation of bearing support assemblies for receiving the body to be tested - G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR ## Abstract A vertical, hard suspension, two plane balancing machine has a suspension cartridge which drops into an aperture in a support plate of the machine base, and a spindle cartridge which slides snugly into bores in the suspension cartridge. The suspension cartridge has two vertically spaced and rigidly interconnected plates, each plate having a bore for the spindle cartridge and having a pair of arcuate slots concentric with the bore defining between the slot ends a pair of resilient webs comprising the machine flexure elements located diametrically on each side of the bore. A force transducer is located in a slot of each plate to measure vibration. The spindle cartridge has a rigid tube containing vertically spaced bearings which rotatably support the spindle. A motor coupled to the spindle through a belt drive is located in the same plane as the webs to minimize the effects of the belt drive forces on the force transducer. ## Claims ### Claim 1 A vertical balancing machine comprising; a base carrying a horizontal support plate having an aperture, a suspension cartridge secured to the support plate for assembly and removal as a unit and at least in part depending through the aperture, the suspension cartridge having a pair of vertically spaced, rigidly interconnected suspension elements, each suspension element having an associated transducer for sensing unbalance signals, and a vertical spindle journaled in a spindle support in the suspension elements, each suspension element comprising a suspension plate rigidly connected to the support plate, the suspension plate having an opening for receiving the spindle support and slot means in the suspension plate for enabling flexing between the opening and the support plate, and motor means supported on the base in driving relation to the spindle. ### Claim 2 (depends on 1) The invention as defined in claim 1 wherein the slot means in each suspension plate defines an outer plate connected to an inner ring through a pair of diametrically extending flexure elements on opposite sides of the ring, the inner ring containing the opening, and means for coupling the spindle to the inner ring. ### Claim 3 (depends on 2) The invention as defined in claim 2 wherein the motor means is coupled to the spindle by a belt drive, and the motor means and the flexure elements are mounted in the same diametrical plane of the spindle thereby minimizing the torsional effects of the belt drive on the unbalance signals. ### Claim 4 (depends on 1) The invention as defined in claim 1 wherein each suspension plate comprises an outer space radially spaced by the slot means form a centrally apertured inner ring and connected thereto through a pair of diametrically extending flexure elements on opposite sides of the ring, means for securing the transducer in the space between the outer plate and the ring at a point equally spaced from the flexure elements, and means for preloading the transducer resulting in a force between the outer plate and the ring, whereby the suspension stiffness depends upon the resilience of the flexure elements and the preloaded transducer. ### Claim 5 A vertical balancing machine comprising; a base carrying a horizontal support plate having an aperture, a suspension cartridge secured to the support plate for assembly and removal as a unit and at least in part depending through the aperture, the suspension cartridge having a pair of vertically spaced, rigidly interconnected suspension elements, each suspension element having an associated transducer for sensing unbalance signals, and a vertical spindle journaled in the suspension elements, and motor means supported on the base in driving relation to the spindle, wherein the suspension elements have central apertures for receiving a spindle cartridge, and the spindle cartridge comprises a tubular housing which snugly fits within the central apertures, a spindle shaft, and a pair of spaced bearing means for mounting the spindle shaft within the housing. ### Claim 6 A vertical balancing machine comprising: a base carrying a horizontal support plate having an aperture, a suspension cartridge secured to the support plate for assembly and removal as a unit and at least in part depending through the aperture, the suspension cartridge having a pair of vertically spaced, rigidly interconnected suspension elements, each suspension element having an associated transducer for sensing unbalance signals, and a vertical spindle cartridge secured in the suspension elements for assembly and removal as a unit, and motor means supported on the base in driving relation to the spindle cartridge, wherein the vertically spaced suspension elements define a pair of vertically spaced axially aligned apertures, and wherein the spindle cartridge comprises a rigid tube snugly mounted in the axially aligned apertures of the suspension elements, a spindle, a pair of vertically spaced bearings for rotatably supporting the spindle in the tube, and means for coupling the spindle to the motor means. ### Claim 7 A vertical balancing machine comprising; a base carrying a horizontal support plate having an aperture, a suspension cartridge secured to the support plate for assembly and removal as a unit and at least in part depending through the aperture, the suspension cartridge having a pair of vertically spaced, rigidly interconnected suspension elements, each suspension element having an associated transducer for sensing unbalance signals, and a vertical spindle cartridge slidably secured in the suspension elements for assembly and removal as a unit, and motor means supported on the base in driving relation to the spindle cartridge, wherein each suspension element includes a plate with a central bore for receiving the spindle cartridge, a pair of arcuate slots through the plate and concentric with the bore for defining inner and outer plate portions and webs between the ends of the slots serving as flexure means, the webs of both suspension elements residing in a common diametrical plane of the bores.