An auxiliary cutting implement for attachment between a broadhead and arrow shaft includes preferably two or more coils each having two cutting edges formed along their opposite elongated side edges. As the coils pass through the animal they unroll and slice through animal flesh in all directions. The coils are biased toward their rolled position which increases the multi-directional movement of the coil and cutting edges through the animal resulting in a large cutting area and fast kill as compared to the broadhead alone.

A spring assembly includes a first coil spring and a second coil spring. The second coil spring includes a first winding portion and a second winding portion. The first winding portion includes a plurality of windings from a first winding to at least a second winding. The second winding portion is a portion except for the first winding portion. An outer diameter of each of the plurality of windings of the first winding portion is smaller than an outer diameter of each of at least one winding of the second winding portion. Each of the plurality of windings of the first winding portion includes the substantially same outer diameter.

A telescopable spring support which comprises a housing, a pressure plate, a load pipe, and a pressure spring and which is designed to elastically support components in a load direction. The housing has a stand side and an upper side, and the pressure plate is arranged in the housing and can be moved within the housing in the load direction. The pressure spring is arranged between the pressure plate and the stand side and applies a spring force to the pressure plate, said spring force being directed towards the upper side in the load direction. The load pipe is connected to the pressure plate and, in each position of the pressure plate, extends outwards from the interior of the housing through an opening arranged on the upper side of the housing. The housing comprises a stand housing and a movable housing. The movable housing can be moved towards the stand housing in the load direction, wherein the stand housing has a stand side, and the movable housing has the opening.

A suspension device includes a pair of suspensions each containing at least one of a damping mechanism and a suspension spring. A tubular body-side member is on a vehicle body side. A tubular wheel-side member is on a vehicle wheel side and coupled to the body-side member, and moves relative to the body-side member in an axial direction. A hollow cylindrical cylinder is inside of the body-side member and the wheel-side member and includes a weak portion in the axial direction on an outer side. A rod member is inside of the body-side member and the wheel-side member and moves relatively in the axial direction in accordance with movement of the body-side member and the wheel-side member. A first defining member secured to an end portion of the rod member and in contact with the cylinder movably in the axial direction of the cylinder defines space in the cylinder.

A suspension device includes a pair of suspensions each containing at least one of a damping mechanism and a suspension spring. A tubular body-side member is on a vehicle body side. A tubular wheel-side member is on a vehicle wheel side and coupled to the body-side member, and moves relative to the body-side member in an axial direction. A hollow cylindrical cylinder is inside of the body-side member and the wheel-side member and includes a weak portion in the axial direction on an outer side. A rod member is inside of the body-side member and the wheel-side member and moves relatively in the axial direction in accordance with movement of the body-side member and the wheel-side member. A first defining member secured to an end portion of the rod member and in contact with the cylinder movably in the axial direction of the cylinder defines space in the cylinder.

A high tension coil spring structure for a bed mattress includes spring bodies and exposed wiring portions which absorb an external load. Diameter-increasing portions (A) are formed on at least one of upper and/or lower end wiring portions (14, 14′) of body wiring portions (12), and provide spaces in which upper and/or lower exposure start wiring portions (16-5, 16-5′) move upward and downward. Rigid support ends (18) are formed on at least one of the body wiring portions (12) and upper and lower exposed wiring portions (16, 16′), and absorb a compressive load. The diameter-increasing portions and the rigid ends of the coil spring structure fundamentally prevent noise caused by friction between the exposed wiring portions and surrounding wiring portions when the exposed wiring portions are compressed and significantly increase the elasticity of the exposed wiring portions.

A method of modeling and designing a helical spring, the helical spring including a top end turn (1), a top transition turn (2), an active turn (3), a bottom transition turn (4), and a bottom end turn (5) from top to bottom, the method including: utilizing first interpolation to determine the radius (R3) of the active turn (3), wherein the active turn (3) is as a function of the longitudinal overall length (L) of the helical spring; and utilizing second interpolation to determine the radius (R2) and the z-coordinate position (Z2) of the top transition turn (2) and the radius (R2) and the z-coordinate position (Z2) of the bottom transition turn (4), wherein each of the z-coordinate position (Z3(θ, L)) of the active turn (3), the radius (R2) and the z-coordinate position (Z2) of the top transition turn (2) and the radius (R2), and the z-coordinate position (Z2) of the bottom transition turn (4) is as a function of the longitudinal overall length (L) and the twist angle (θ) of the helical spring.

The present application provides a superimposed opposing wave spring that has a plurality of superimposed-layer wave spring units, wherein each layer in each superimposed-layer wave spring unit is formed by spirally bending around an axis into a wave shape, and waveforms of the respective layers in each superimposed-layer wave spring unit are arranged to overlap each other. At least one connection spring part, which connects two adjacent superimposed-layer wave spring units that are stacked one above the other, so that the two adjacent superimposed-layer wave spring units respectively have a first wave trough and a second wave crest that are abutting each other with opposing apexes, and respectively have a first wave crest and a second wave trough that are arranged across from each other in an upper position and a lower position.

A terminal is to be connected to a mating terminal having a flat surface portion. The terminal includes a conductive main body having an abutment surface, an annular terminal spring, the annular terminal spring being held on the abutment surface and a fastener holding the annular terminal spring on the abutment surface. The fastener includes a main body shaft being inserted into a central space of the annular terminal spring, a first end of the main body shaft being fixed to the conductive main body, and a plurality of arm portions extending outward in a radial direction of the fastener from a second end of the main body shaft, the second end being opposite to the first end, the plurality of arm portions being configured to hold the annular terminal spring at a contacting portion of the annular terminal spring, the contacting portion contacting the abutment surface.

According to an embodiment, a coil spring includes a wire rod having an end and the other end. The wire rod of the coil spring includes, with regard to a section of the wire rod, a round section potion of an effective spring part, a square section portion in which the section is substantially square, and a taper portion. The square section portion includes an end turn part. A length of each side of the section of the square section portion is less than or equal to a square root of ½ multiplied by a diameter of the wire rod of the round section portion. In the taper portion, from the round section portion to the square section portion, the section changes from a round shape to substantially a square shape, and a sectional area is decreased.