A demountable assembly structure includes a first body, second body, and engaging component. The first body has a first sliding surface and a slide switch recess positioned proximate to the first sliding surface. The second body has a second sliding surface and an engaging channel positioned proximate to the second sliding surface. The engaging channel is opposite the slide switch recess. The engaging component has a slide switch and a resilient element. The resilient element has a basal portion fixedly disposed in the slide switch recess and a resilient engaging arm extended from the basal portion to the engaging channel and engaged inside the engaging channel. The resilient engaging arm has a guide surface opposite the engaging channel. When the first sliding surface slides onto the second sliding surface, the resilient engaging arm gets engaged inside the engaging channel by having the guide surface slid along the engaging channel.

One embodiment of a gun configured with soft recoil system comprises a plurality of recoiling parts that initially moves in the direction of the projectile being fired before moving in a direction opposite to that of a projectile during the firing of the round. The soft recoil system throttles the movement of the recoiling parts such that the energy expended during the firing of the round is spread over a longer time period and a longer distance than would normally occur. The soft recoil system stores at least a portion of the energy transferred to the recoiling parts and the user may selectively release at least a part of that portion of energy to offset the energy imparted to the gun during the firing of the next round.

A system for receiving and ejecting a fluid testing device test strip includes a strip connector having first and second guide rails, and divider walls each having a channel. A sled has first and second legs connected to a cross member. Each leg has a contact leg extending inwardly from a chamfered end. The first and second legs when positioned parallel to the guide rails have the contact leg captured in the divider wall channels retaining the sled in sliding contact with the guide rails for motions in loading and ejection directions. A mechanism assembly is movably connected to the fluid testing device. The cross member is coupled so operation in a first direction displaces the sled in the loading direction positioning the sled in a test strip test position, and opposite operation positions the contact legs in direct contact with and ejects the test strip.

A reciprocator-type quick-releasing mechanism includes a base, a latching component and an actuating component. The base has a first piercing hole and a first opening. The latching component is disposed on the base and includes a constraining portion and a resilient portion. The constraining portion is disposed inside the first piercing hole and connected to the resilient portion. The actuating is component disposed on the base and includes a pushing portion and an actuating portion. The pushing portion contacts the resilient portion to guide the resilient portion and connected to the actuating portion for aligning the first opening and a second opening on an external unit. The actuating portion is moved to slide the resilient portion, so as to move the constraining portion through the first piercing hole for letting the constraining portion leave a second piercing hole or pushing a buckling portion on the external unit.

A fastening structure includes an operating engaging element and a body portion. The operating engaging element has an engaging portion and an operating portion. The operating portion has a moving surface abutting against a corresponding moving surface of the operating engaging element to cause movement of the operating engaging element. The body portion has a mounting portion which the operating engaging element is mounted on; or the operating engaging element has a mounting portion which the body portion is mounted. With the engaging portion, the operating engaging element is fastened to an object, and the body portion is fastened to another object, thereby fastening the two objects together. Unfastening the two objects entails pressing the operating portion such that the moving surface of the operating portion abuts against the corresponding moving surface of the operating engaging element to cause movement of the operating engaging element, thereby separating the objects.

A reciprocator-type quick-releasing mechanism includes a base, a latching component and an actuating component. The base is disposed inside a first module, and has a first piercing hole and a first opening. The latching component is disposed on the base, and includes a constraining portion and a resilient portion. The constraining portion aligns with the first piercing hole and a second piercing hole on a second module. The resilient portion is connected to the constraining portion. The actuating component is slidably disposed on the base and includes a pushing portion and an actuating portion. The actuating portion is connected to the pushing portion and protrudes from the first opening and a second opening on the second module. The actuating portion moves relative to the second opening to flexibly deform the resilient portion via the pushing portion, so as to remove the constraining portion from the second piercing hole.

A coupling device comprising arranged in two opposing walls of a box-like enclosure, two flexible tabs from which two raised portions which act against each other protrude inward, one of which is adapted to engage a rigid laminar element to be inserted between the two flexible tabs while the other, after the coupling, can be pushed manually in order to move the coupled raised portion and release the rigid laminar element to be removed.

A cargo bay accessory for inserting into a cargo bay of a truck, the cargo bay accessory having opposing stepped side walls forming horizontal support surfaces at different elevations, wherein the support surfaces on one side are at the same elevation as the support surfaces on the opposite side, and wherein the lower support surfaces are laterally spaced closer together than higher support surfaces.

One embodiment of a gun configured with the soft recoil system comprises a plurality of recoiling parts that initially moves in the direction of the projectile being fired before moving in a direction opposite to that of a projectile during the firing of the round. The soft recoil system throttles the movement of the recoiling parts such that the energy expended during the firing of the round is spread over a longer time period and a longer distance than would normally occur. The soft recoil system stores at least a portion of the energy transferred to the recoiling parts and the user may selectively release at least a part of that portion of energy to offset the energy imparted to the gun during the firing of the next round.

A quick release fastener for a hand-operated band saw with a saw band run on wheels in a housing, which has a base tray and a hinged lid and on which there is a handle. The handle is fixed to an upper angled edge of the lid and located below the handle there is a spring-loaded handle bar with two bent ends. The one end is fixed at the edge of the lid and the other end engages in a groove in the base tray through a recess in the edge.