Abstract:
A manually adjustable vehicle seat comprises elongated seat supporting carriages each of which is mounted for rolling movement on a pair of balls located adjacent the ends of the carriage. The balls roll on short track members having end abutments and the track members include means for limiting longitudinal movement. A latch lever is provided having an aperture plate portion movable in latching position to receive one of a series of latching projections provided on the mounting base.

Description:
BRIEF SUMMARY OF THE INVENTION 
     The seat construction of the present invention comprises a pair of assemblies mounted at opposite ends of the seat. Each assembly comprises structure providing a pair of short suporting track elements each of which has abutment means at opposite ends. At each end of the seat there is provided an elongated seat supporting bar herein referred to as a carriage. The carriage is of generally C-shaped cross-section having upper and lower reversely curved flanges adapted to be engageable with balls located at the upper and lower sides of the track element. After the carriage has been assembled with the track elements and with the balls in place, the carriage is deformed so as to prevent escape of the balls. 
     A special latching construction is provided comprising a longitudinally extending series of laterally projecting locating teeth provided on a stationary mounting base. Pivoted to the carriage is a latching lever having at one end a plate portion provided with an aperture shaped to receive one of the locating teeth. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a side elevational view of the assembly at one end of the seat. 
     FIG. 2 is a plan view of the assembly illustrated in FIG. 1. 
     FIG. 3 is an enlarged end view of the structure shown in FIG. 1. 
     FIG. 4 is a sectional view on the line 4--4, FIG. 1. 
     FIG. 5 is a fragmentary plan view illustrating the coaction between the latching lever and the locating teeth. 
     FIG. 6 is an end view of the lever illustrated in FIG. 5, as seen from the right thereof. 
     FIG. 7 is a fragmentary elevational view of the end of the latching lever. 
     FIG. 8 is a fragmentary plan view of a modification of latching means. 
     FIGS. 9 and 10 are sectional views on the line 9--9, and 10--10, of FIG. 8. 
     DETAILED DESCRIPTION 
     Referring now to the drawings, the seat supporting construction at the end of the seat provided wih the latching means, is illustrated in its entirety in FIGS. 1 and 2. It will be understood that the construction at the opposite end of the seat is essentially the same except for reversal of direction and except for the fact that locating teeth are omitted. 
     The supporting construction comprises a mounting base 10 having a front downwardly extending portion 12 and a rear downwardly extending portion 14 adapted to be bolted or otherwise secured to the floor of the passenger compartment of a vehicle. The intermediate portion of the mounting base is elevated as clearly illustrated in FIG. 1. The mounting base includes a front upwardly extending portion 16 and a rearwardly upwardly extending portion 18 to which are secured a front track forming element 20 and a rear track forming element 22. 
     The track forming elements are elongated strips which have a cross-sectional shape as best illustrated in FIG. 3 where the rear track forming element 22 is seen to have an intermediate web portion 24, and upwardly and downwardly extending abutment ears 26 and 28 located at the rear thereof, and upwardly and downwardly extending ears 30 and 32 located at the forward end thereof. Intermediate the ears 26 and 30 there is provided a flat horizontally extending trackway 34 provided by the upper edge of the strip, and similarly, between the downwardly extending ears 28 and 32 is a downwardly extending trackway 36. 
     The front track forming elements 20 are similar and have front upwardly and downwardly extending abutments 38 and 40, and rear upwardly and downwardly extending abutments 42 and 44. Intermediate the ears of abutments 38 and 42 the upper edge of the strip provides a straight flat ball supporting surface or trackway 45a and intermediate the ears or abutments 40 and 44 at the bottom edge of the track forming element 20 is a straight flat ball engaging surface 45b. The track forming elements are rigidly attached to the adjacent upwardly extending portion 16 or 18 of the mounting base by suitable means such as rivets 46. 
     Also attached to the upwardly extending portions of the base are resilient ball retainers 48 each having an upper laterally extending flange 50 which is transversely curved to substantially embrace an upper seat supporting ball 52, and a similar laterally curved longitudinally extending downwardly concave flange 54 shaped to interfit with the lower supporting ball 56. 
     The longitudinally adjustable vehicle seat, a portion of which is indicated at S, is suitably secured to front and rear mounting brackets 58, the brackets being rigidly secured as by rivets 60 to the front and rear end portions of the longitudinally extending carriage 62. 
     As best illustrated in FIG. 4, each of the carriages is of generally C-shape in cross-section having an upper flange 64 which is laterally and transversely curved to provide a generally arcuate recess 66 shaped to have rolling engagement with the upper seat supporting ball 52. The lower edge of the carriage 62 has a laterally and transversely curved edge portion 68 defining an upwardly concave recess 70 which receives the lower seat supporting or retaining ball 56. 
     From an inspection of FIG. 3 it will be observed that the laterally extending portions 50 and 54 of the ball retainer 48 lie along the straight generally hoizontal ball supporting portions 45a and similarly, the lower portion 54 of the ball retainer lies along the straight track forming portion 45b. The ball retainer is formed of resilient hardened steel material and constitutes a wear surface for the balls so that continued adjustment of the seat does not result in wear of the track forming elements. Similarly, the ball retainer elements serve to insure that the balls are firmly engaged at all times with the inner concave ball engaging surface of the carriage 62. It will be appreciated that in use the weight of the seat and occupants thereof urge the carriage 62 downwardly so that the upper ball 52 is firmly engaged within the concave surface 66 of the carriage. However, the downward urging of the seat might, in the absence of the resilient ball retainer, provide for disengagement between the lower seat supporting ball 56 and the upwardly concave surface 70 at the lower edge of the carriage. Forward and rearward adjustment of the seat results in the carriage rolling on the balls 62 while the balls 52 at the same time roll on the concave trackway provided by the upper flange 50 of the ball retainer. 
     It is desirable for the upper and lower balls 52 and 56 to partake of precisely the same movement. It will be understood that the lower ball insures against lifting of the seat as a result of bumps or other vehicle motion and that the resilient ball retainer will insure that the upper and lower balls are constantly in the same position relative to the seat supporting elements. 
     In assembling the construction the balls are inserted into the space provided by the associated laterally curved flanges of the carriages, such as the carriage 62, and the reversely curved edge portions of the ball retainers. After the balls have been inserted the carriage is deformed by providing abutment forming dimples 72, 74, 76 and 78 at the front thereof. Similarly, dimples 80 and 82 are provided adjacent the rear of the carriage while the extreme rear end of the carriage is deformed, as indicated at 84 and 86, to provide ball retaining abutments. 
     With the foregoing construction each seat is mounted for substantially free rolling movement on four balls, two being provided at each end of the seat and of these two, one is located adjacent the forward edge of the seat and the other is located adjacent the rearward edge of the seat. 
     In order to provide for secure latching of the seat in adjusted position, the mounting base at one side of the seat is bent laterally as seen in FIGS. 1 and 4 and provided with a multiplicity of teeth 90 and these teeth extend laterally inwardly of the seat construction into close proximity to vertical web of carriage 62. The adjacent carriage 62 has an intermediate portion partially cut out to provide an opening 92 as seen in FIGS. 1 and 4 and this cutout portion is bent laterally to extend inwardly and to provide a pivot supporting ear 94. This ear is provided with an opening 96 to which a latching lever 98 having a stiffening flange 99 is pivoted as by the rivet indicated at 100. 
     The lever 98 has a laterally extending end portion 102 which at its outer end is bent upwardly to provide an ear 104 which is apertured as indicated at 106. The aperture 106 has portions 108 and 110 at opposite sides thereof which are adapted to enter into spaces between the mounting teeth 90, as best seen in FIG. 5, and these portions 106 and 108 are interconnected across the top of the opening 106 as clearly seen in FIG. 6. 
     The laterally extending portion 102 of the latching arm or lever 98 extends through an opening 112 provided in the vertically extending wall of the carriage 62, as best seen in FIG. 5. This provides close support for the apertured ear 104 of the latching lever closely adjacent to the point where the opening therein surrounds and closely engages opposite sides of one of the locating teeth while at the same time the sides of the ear 104 engage the confronting surfaces of the teeth adjacent the tooth which enters the opening 106. 
     The latching lever 98 is provided with a laterally extending ear 114 to which is anchored a tension spring 116 biasing the lever 98 to the latching position. Forwardly of the seat the lever 98 has a handle portion 118 which when moved to the left (downwardly as seen in FIG. 2) will swing the lever to release the latching ear 104 from the associated tooth 90 of the mounting base. 
     FIG. 7 illustrates the end of the latching lever as seen in FIGS. 5 and 6. 
     Referring now to FIGS. 8-10 there is illustrated a modified form of latching construction which embodies the advantages of the previously described embodiment. As seen in these Figures, the latching lever is indicated at 120 and is pivoted to an ear 122 struck out of the intermediate web 124 of carriage 126, leaving an opening 128 therein. The lever 120 is pivoted by suitable pivot means 130 such as a rivet to the ear 122 and at its free end the lever 120 has an upwardly bent plate portion 132 to which is fixedly secured a pin 134. The carriage 126 has an opening therethrough which receives a guide bushing 136 in which the pin 134 is longitudinally slidable. The base 140 is provided with a multiplicity of pin receiving openings 142. With this arrangement, as best seen in FIG. 10, the latching pin 134 is guidably received in the bushing 136 mounted in an opening in the carriage and the end of the bushing 136 is located closely adjacent to the portion of the base 140 provided with the series of openings 142. What I claim as my invention is: