A sealing cap for a compressor is made of an elastically-deformable material and includes a plug portion, a bolt insertion portion, a tab portion, and a plate-like body portion. The plug portion is to be inserted into a fluid port of a compressor to plug the fluid port. The plate-like body portion integrally joins the plug portion, the bolt insertion portion, and the tab portion. The bolt insertion portion extends from a front surface of the body portion. The tab portion is formed on the front surface of the body portion. The plug portion is projectingly formed on a rear surface of the body portion. The tab portion includes a ring having an annular shape, and is located opposite to the bolt insertion portion across the plug portion. The ring has an opening that extends through the ring in a direction that crosses insertion direction of the plug portion.

A power amplifier with adjustable voltage standing wave ratio is described which comprises an amplifier unit, a coupler configured to obtain an incident power and a coupled reflected power, and a power control unit. The power control unit is configured to control the amplifier unit. The power control unit has two power detectors configured to provide actuating variables which correspond to the incident power and the reflected power, respectively. The power control unit comprises two digital potentiometers which are configured to variably weight the actuating variables wherein the power control unit is configured to determine a control variable for the amplifier unit based on the actuating variables such that a predetermined power level related to a set value of the voltage standing wave ratio is not exceeded by the incident power and/or the reflected power. Further, a radio frequency electronic device and a method are described.

A seal cover (1) is provided for closing an annular opening portion (10) that has locking projections (14) on an outer peripheral surface of the opening portion (10). The seal cover (1) includes a fitting (22) having a seal ring (23) fit on an outer peripheral surface and locking portions (24) configured to be pushed and resiliently deformed by the locking projections (14), to move over the locking projections (14) and to be locked to the locking projections (14) when the fitting (22) is fit into the opening portion (10). Tapered surfaces (27) are formed on front end parts of the locking portions (24) and are disposed in a connecting direction for delaying a time point (T2) when the locking portions (24) are maximally resiliently deformed from a time point (T1) when the seal ring (23) is compressed maximally when the fitting (22) is fit into the opening portion (19).

A hole plug includes a ceiling part covering an attachment hole formed in an attachment member, a flange part connected to the ceiling part and covering an opening peripheral surface of the attachment hole formed in the attachment member at a predetermined inclined angle against the opening peripheral surface, a cylindrical outer peripheral wall part extending downward from an inner edge part of the flange part, and a connection member connecting the lower part of the outer peripheral wall part to the ceiling part. The outer peripheral wall part includes an upper part extending downward from the inner edge part of the flange part, a lower part formed coaxially with and radially inward to the upper part, and a bent part connecting the upper and lower parts of the outer peripheral wall part and having a thickness less than that of the upper part located above the bent part.

A hole plug includes a ceiling part covering an attachment hole formed in an attachment member, a flange part connected to the ceiling part and covering an opening peripheral surface of the attachment hole formed in the attachment member at a predetermined inclined angle against the opening peripheral surface, a cylindrical outer peripheral wall part extending downward from an inner edge part of the flange part, and a connection member connecting the lower part of the outer peripheral wall part to the ceiling part. The outer peripheral wall part includes an upper part extending downward from the inner edge part of the flange part, a lower part formed coaxially with and radially inward to the upper part, and a bent part connecting the upper and lower parts of the outer peripheral wall part and having a thickness less than that of the upper part located above the bent part.

A method of manufacturing a hydraulic plug. A shell with a circumferential wall, a sealed end, an open end and an axially extending cavity within is provided in which the cavity is defined by an internal surface with an inner diameter which narrows towards the open end. A head of an expander is inserted into the cavity, the expander further comprising a stem extending from the cavity for applying a tensile force (T) to the head. A sleeve is provided on a stem side of the head extending into the cavity, an end of the sleeve adjacent the head having an inner diameter which is less than a maximum outer diameter of the head. The sleeve is formed by expanding the sleeve by forcing the head into the end of the sleeve through urging the sleeve and/or expander towards the other in an axial direction.

A hole plug includes a ceiling part covering an attachment hole formed in an attachment member, a flange part connected to the ceiling part and covering an opening peripheral surface of the attachment hole formed in the attachment member at a predetermined inclined angle against the opening peripheral surface, a cylindrical outer peripheral wall part extending downward from an inner edge part of the flange part, and a connection member connecting the lower part of the outer peripheral wall part to the ceiling part. The outer peripheral wall part includes an upper part extending downward from the inner edge part of the flange part, a lower part formed coaxially with and radially inward to the upper part, and a bent part connecting the upper and lower parts of the outer peripheral wall part and having a thickness less than that of the upper part located above the bent part.

A hole plug includes a ceiling part covering an attachment hole formed in an attachment member, a flange part connected to the ceiling part and covering an opening peripheral surface of the attachment hole formed in the attachment member at a predetermined inclined angle against the opening peripheral surface, a cylindrical outer peripheral wall part extending downward from an inner edge part of the flange part, and a connection member connecting the lower part of the outer peripheral wall part to the ceiling part. The outer peripheral wall part includes an upper part extending downward from the inner edge part of the flange part, a lower part formed coaxially with and radially inward to the upper part, and a bent part connecting the upper and lower parts of the outer peripheral wall part and having a thickness less than that of the upper part located above the bent part.

A hole plug which includes a flange part which covers an opening peripheral surface of an attachment hole formed on an attachment member at a predetermined inclined angle against the opening peripheral surface and a cylindrical outer peripheral wall part formed to extend downward from an inner edge part of the flange part. A flange part associating bending part is formed as a base point in order for bending an upper part of an outer peripheral wall part of the hole plug from a predetermined position of the outer peripheral wall part in a direction away from a hole edge when a tip of a flange part is contacted with an opening peripheral surface of the attachment member. Thus, the hole plug can reduce an insertion load, corresponding to variation of a plate thickness, and maintain a water sealing property.

A hole plug which includes a flange part which covers an opening peripheral surface of an attachment hole formed on an attachment member at a predetermined inclined angle against the opening peripheral surface and a cylindrical outer peripheral wall part formed to extend downward from an inner edge part of the flange part. A flange part associating bending part is formed as a base point in order for bending an upper part of an outer peripheral wall part of the hole plug from a predetermined position of the outer peripheral wall part in a direction away from a hole edge when a tip of a flange part is contacted with an opening peripheral surface of the attachment member. Thus, the hole plug can reduce an insertion load, corresponding to variation of a plate thickness, and maintain a water sealing property.