Ammunition and explosive-charge making
Patent
1989-09-29
1991-10-29
Ruehl, Charles A.
Ammunition and explosive-charge making
73756, 7386264, G01L 500, G01L 104
Patent
active
050605259
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an elastic connection and a force measuring device, as well as a method of manufacturing it.
BACKGROUND OF THE ART
In the International Patent Application WO 87/02129 such elastic connections have been disclosed having at least one force, pressure or torque sensor arranged in an elastomeric material provided between connected parts. Specifically, an arrangement at a spring leg is explained, the force measuring device, however, having a large height of construction and assembly and maintenance work being cumbersome. Furthermore, it is often required to pass ducts or the like through such elastic connections.
Furthermore, U.S. Pat. No. 4,770,050 discloses a measuring device comprising a potlike exterior element in the bottom of which is provided a central opening into which upon curing of the elastomeric material a pressure sensor is inserted and secured by screws. Thus, the pressure sensor is in direct contact with the elastomeric layer.
Though the exchangeable pressure sensor is calibrated and compensated even before insertion it has become apparent that after exchanging the pressure sensor or other transducers the readings of the measurement with equal load sometimes had considerable deviations. The reason for this insufficient reproducibility lies in impurities or inclusions in the contact surface between the elastomeric material and the pressure sensor such that incorporating the sensor requires extreme cleanness. In addition to this disadvantage of insufficient measuring accuracy, in particular when exchanging the pressure sensor in a dusty atmosphere, as f.i. in tool shops the building-in of the pressure sensor is relatively complex since first the pressure sensor must be inserted and then fixed to the supporting element by means of a securing ring and several screws.
SUMMARY OF THE INVENTION
Therefore, it is the object of the invention to provide an elastic connection, specifically a force measuring device, of the above-defined type and a method for manufacturing such an elastic connection, specifically a force measuring device offering a simpler building-in, respectively, exchangeability and measuring readings having a highly accurate reproducibility.
Through a passage in the tube-like inner element lines, shafts and cords may be passed and rigid elements, as f.i. piston plungers of a spring leg may be fixed thereto in an easy accessible manner. For the preferred case of application of a force measuring device in a vehicle, in particular at the spring leg support of an axle it is proposed that the potlike outer element and the pistonlike inner element only have a ringlike mutual contact surface filled with elastomeric material the center of which being provided with a passage for the spring leg piston plunger. Thus, the piston plunger of the spring leg as well as the sensor may be secured in or at the force measuring device, respectively, for completing it from the above in an easily accessible manner. This easy access is of particular importance not only for the assembly during first production at an assembly line but also for later maintenance and exchange operations in service shops. Furthermore, in view of the central passage in the force measuring cell and the preferable excentric arrangement of the associated sensor in the rest of the ring within the spring leg dome the height of the device and the means for securing the force measuring device are considerably reduced as may be appreciated when comparing with the prior art. An exact guidance and alignment is provided by the narrow cylindrical gap; the formed step provides a large stable supporting surface.
According to the method for manufacturing the force measuring device by inserting or exchanging a laterally provided pressure/force sensor at a force measuring device at first a liquid is filled in into the fill-in opening and subsequently the sensor together with the sensor holder is inserted, in particular screwed in into the fill-in opening. Due to the oil filling the space between th
REFERENCES:
patent: 1994388 (1935-03-01), Erichsen
patent: 2681565 (1954-06-01), Kelk
patent: 3410135 (1968-11-01), Reynaud
patent: 4770050 (1988-09-01), Hafner et al.
patent: 4830399 (1989-04-01), Hafner
patent: 4864874 (1989-09-01), Hafner
Pfister GmbH
Ruehl Charles A.
LandOfFree
Resilient connecting device, in particular with incorporated for does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Resilient connecting device, in particular with incorporated for, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Resilient connecting device, in particular with incorporated for will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1391898