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| Nonwoven fiber abrasive disk |
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| Fluff-type organic insulating pulp and method of fabrication |
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| Metal reinforcing strips |
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| Nailing tool |
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Pivot arm for apparatus, particularly medical apparatus
| Details |
Inventors: Warga, Ewald;
Assignee:
Primary Examiner: Cuomo; Peter M.
Assistant Examiner:
Attorney, Agent or Firm: Wigman & Cohen
A pivot arm for apparatus, particularly medical apparatus has two mounting supports and a connecting cross-member. One mounting support is to be mounted on a stationary support and the other is to be attached to the apparatus to be moved. A first coupling hingedly connects one of the mounting supports to a connecting rod housed within the cross-member, and the other end of the connecting rod is connected to the other mounting support. A helical spring is supported concentrically with respect to the connecting rod within the cross-member. The cross-member is formed as a single hollow, essentially completely closed, primarily tubular spring housing and a second coupling is provided between a spring support that is near the end of the rod and is stationary relative thereto, and the adjacent mounting support, so that both couplings are always arranged parallel to each other in the housing. The ends of the housing are sealed with caps to prevent the escape of undesirable matter, such as dust, dirt, or lubricants. |
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DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT Referring now in detail to the drawings wherein like parts are designated by like reference numerals throughout, there is illustrated in FIGS.
1a and 1b, a pivot arm according to the invention.
In the exemplary embodiment, the pivot arm according to the invention primarily externally comprises a flat, four-sided tube 12, made for example of aluminum; two caps 14 and 15 that close the open ends of the tube 12, which caps are preferably made of plastic; two always-parallel cylindrical mounting supports 16 and 18, made for example of aluminum, on the tube ends, and of two annular folding bellows 20 and 22, made for example of rubber, on the tube ends, each of which surrounds the upper end of a vertical mounting support 16, 18 so as to seal it against liquid, and is attached to the underside of the tube 12.
It should be assumed that the one support 16 serves to provide the end mounting of the pivot arm to a stationary support or other such carrier and the other support 18 serves to attach an apparatus to the other end of the pivot arm that pivots up and down in a plane.
The four-sided tube 12 has at the bottom on each end a rectangular longitudinal opening that is open toward the end 24, 26 which openings are of different lengths for the passage of an upward extension 28, 30 of the support 16, 18, which support thereby engages into the hollow chamber in the tube 12.
Near the mounting support 16, the top and bottom sides of the tube 12 are provided with respective pairs of inwardly projecting beads 32, which are arranged in the same cross-sectional plane of the tube 12, which is perpendicularly intersected by the central longitudinal axis 34 of the tube 12.
Otherwise the four-sided tube 12 is completely smooth.
The inserted cup-shaped cap 14 closes flush with the end of the tube it closes and a thicker area 36 engages below in the end section of the longitudinal opening 24.
The inserted cup-shaped cap 15 closes flush with the end of the tube 12 it closes and closes the end section of the longer longitudinal recess 26 by means of a large-surface-area downward projection 38, which projection is formed thereon and on an extension 40 present only on the bottom
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