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Bellows

About: Bellows is a research topic. Over the lifetime, 15312 publications have been published within this topic receiving 73914 citations.


Papers
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Patent
30 Aug 1979
TL;DR: In this paper, a heat-sealable foil is shaped around a shaping pipe to form a tube and during removal from the shaping pipe is provided with transverse seams by means of transverse heating jaws.
Abstract: A heat-sealable foil is shaped around a shaping pipe to form a tube and during removal from the shaping pipe is provided with transverse seams by means of transverse heating jaws. The resulting bags are filled by means of a fill pipe and a dosaging worm or auger. A conduit leads from the lower end of the shaping pipe to a bellows and to a bottle of protective gas. The bellows forms a closed chamber whose volume is periodically increased and reduced in the operating rhythm of the bag forming apparatus by means of drive members. Thus the pressure conditions at the end of the shaping pipe can be influenced periodically, so as to avoid that the filled or sealed bags contain undesirable air inclusions or, when filling under protective gas, so as to avoid greater losses of protective gas from leaking into the open air.

35 citations

Patent
16 Aug 1990
TL;DR: A dispenser has a pump device with two hollow pistons, which are displaceable coaxially with respect to each other, and where one piston is seated at the pump base while the other is seated on an actuating button.
Abstract: A dispenser has a pump device (4) with two hollow pistons (9, 10) which are displaceable coaxially with respect to each other, and wherein one piston is seated at the pump base while the other piston is seated on an actuating button (30) The button continues into a mouthpiece (29) and is surrounded by a bellows (B) which provides an axial restoring force The bellows (B) forms a piston ring (K) at a distance (A) from the upper end of the actuating button-side hollow piston (9), and slides on a wall surface (b 9') of the button side hollow piston

35 citations

Patent
13 Jun 1983
TL;DR: In this paper, a gas mask consisting of an outer full mask and an inner half mask for closed cycle respirators leaving an interspace between the half mask and the full mask is constructed.
Abstract: A gas mask comprises an outer full mask and an inner half mask for closed cycle respirators leaving an interspace between the half mask and the full mask. The outer mask is sealed around the person's face by one or more sealing frames and the inner mask is sealed with the face around the wearer's nose and mouth. The construction includes a passage between the half mask and a full mask with a check valve which opens with exhalation resistance in a direction toward the space between the full mask and the half mask. The outer full mask has a wall with a linkage compensation device which is closed by a cover and includes a bellows which expands and contracts in the device in accordance with variations in pressure within the interspace between the two masks. A spring is employed to bias the bellows into one of an expanded or contracted situation so that the bellows may either expand or contract against the spring pressure during operation and provide a leakage compensation in the space between the masks.

34 citations

Patent
13 Sep 1993
TL;DR: The cervical traction device as mentioned in this paper consists of a body including a shoulder portion, a head portion and a bellows which extends substantially across the width and height of the body between and connected to the head and to the shoulder portion and acting against and between substantially the full inner end surface of the head portion.
Abstract: The cervical traction device comprises: a body including a shoulder portion, a head portion and a bellows which extends substantially across the width and height of the body between and connected to the head portion and to the shoulder portion and acting against and between substantially the full inner end surface of the head portion and the full inner end surface of the shoulder portion. The bellows, the shoulder portion and the head portion have aligned U-shaped openings therein adapted to receive a patient's neck. A hand operated air pump is connected to the bellows for pumping air into the bellows and for relieving or pumping air out of the bellows.

34 citations

Patent
21 Dec 1988
TL;DR: In this paper, a vacuum storage device comprises a base member, a housing sealingly and removably mounted on the base member to form a storage chamber, a pressue reducing device mounted on either of the base members and housing, and a means for introducing air into the storage chamber.
Abstract: A vacuum storage device comprises a base member, a housing sealingly and removably mounted on the base member to form a storage chamber, a pressue reducing device mounted on either of the base member and housing, and a means for introducing air into the storage chamber. The pressure reducing device comprises a barrel and a bellows pump housed therein, the bellows pump comprising a bellows body with an inlet valve, which opens the bellows body to said storage chamber during the suction stroke, and an outlet valve, which opens the bellows body to the open air during the dischargeing stroke. The pressure reducing device includes a means for communicating its barrel chamber with the storage chamber.

34 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202358
2022118
202194
2020195
2019344
2018614