Recoil spring housing assembly

Track recoil mechanism comprising:

• an elongated unitary housing having an axis and a pair of spaced apart end walls connected a fixed distance apart along said axis by side wall means including a pair of flanges for securing said housing between a pair of spaced apart horizontally extending parallel side rails;
• aligned apertures formed in said end walls along said axis;
• spring retainer means detachably mounted in said housing and including a pair of springs mounted therein, said retainer means comprising first and second spaced apart annular spring seat members interconnected by adjustable means for precompressing said springs independent of said end walls for placement between said end walls;
• said end walls being spaced a predetermined fixed distance apart for establishing a pretension in said springs when said spring seat members engage and are confined by said end walls;
• said first spring seat member including pilot means extending into one of said apertures for retaining said assembly in place;
• the second of said seat members having a cupshaped portion opening toward the other of said apertures for receiving an idler rod of a yoke assembly extending through said aperture;
• and,
• a sleeve extending through said aperture and engaging said cup portion for retaining same in place in said housing.