The pinching operation is facilitated. A hose clamp (H1) is formed by bending a strip-like plate material (1) into a ring-like configuration, and includes a first end portion (5) having a first pinching operation surface (9), and a second end portion (6) having a second pinching operation surface (15). A through-hole (7) is open near the center in the longitudinal direction of the first pinching operation surface (9). At the time of bending into ring-like configuration, expansion regions (19) arranged at both side portions in the width direction of the second pinching operation surface (15) are folded at folding edges (20) with respect to a proximal region (18), whereby the second pinching operation surface (15) is narrowed in the width direction and can enter the through-hole (7). After bending into ring-like configuration, the expansion regions (19) are unfolded at the folding edges (20) and regain a widened state.

A tube coupling having a coupling body with an opened ended throughway to receive a tube. A collet located in the open end of the through way has a ring and flexible arms extending generally axially of the ring into the throughway. The throughway has a tapered surface convergent towards the open end and the collet arms have heads at their distal ends for engaging both of the tapered surface and a tube extending through the collet. A collet lock is formed on the collet, the collet having a locked rotary position and an unlocked rotary position. One of the body and the collet is provided with a cam surface and the other is provided with a cam follower, the cam surface being provided to provide the locked and unlocked positions. The disclosure also extends to the collet.

A tube coupling having a coupling body with an opened ended throughway to receive a tube. A collet located in the open end of the through way has a ring and flexible arms extending generally axially of the ring into the throughway. The throughway has a tapered surface convergent towards the open end and the collet arms have heads at their distal ends for engaging both of the tapered surface and a tube extending through the collet. A collet lock is formed on the collet, the collet having a locked rotary position and an unlocked rotary position. One of the body and the collet is provided with a cam surface and the other is provided with a cam follower, the cam surface being provided to provide the locked and unlocked positions. The disclosure also extends to the collet.

A hoop, includes a connecting section, a fixing section and a hooping section, the fixing section is provided with a first receiving hole and a second receiving hole; and the fixing section is provided with an arch structure, the joint of the arch structure and the fixing section is provided with an abutting interface, the abutting interface is arranged on the side edge of the arch structure departing from the hooping section; and the fixing section is provided with a convex strengthening structure at the corner of the abutting interface.

A hoop, includes a connecting section, a fixing section and a hooping section, the fixing section is provided with a first receiving hole and a second receiving hole; and the fixing section is provided with an arch structure, the joint of the arch structure and the fixing section is provided with an abutting interface, the abutting interface is arranged on the side edge of the arch structure departing from the hooping section; and the fixing section is provided with a convex strengthening structure at the corner of the abutting interface.

Disclosed examples relate to a molded insert assembly for a fracking hose clamp, and a method for manufacturing and assembling thereof. In at least one example, the molded insert assembly includes a pair of molded insert portions, each molded insert portion comprising: a forward end and an opposed rear end, extending along an extension axis; a pair of contact surfaces spanning along either lateral side, wherein the contact surfaces extend along a contact plane; each contact surface comprising a tab-receiving groove having an open end defined along the corresponding lateral side; a hose-receiving surface extending, along the lateral axis, between the pair of contact surfaces, and further extending between the forward and rear ends, wherein the hose-receiving surface has a cross-sectional concave profile extending from the contact plane and along a traverse axis; and one or more sloped members, extending from the rear end and contiguous with the hose-receiving surface.

Disclosed examples relate to a molded insert assembly for a fracking hose clamp, and a method for manufacturing and assembling thereof. In at least one example, the molded insert assembly includes a pair of molded insert portions, each molded insert portion comprising: a forward end and an opposed rear end, extending along an extension axis; a pair of contact surfaces spanning along either lateral side, wherein the contact surfaces extend along a contact plane; each contact surface comprising a tab-receiving groove having an open end defined along the corresponding lateral side; a hose-receiving surface extending, along the lateral axis, between the pair of contact surfaces, and further extending between the forward and rear ends, wherein the hose-receiving surface has a cross-sectional concave profile extending from the contact plane and along a traverse axis; and one or more sloped members, extending from the rear end and contiguous with the hose-receiving surface.