US1568858A - Rebound check - Google Patents

Description

Jan. 5 1926.

N. F.-M NAUGHT REBOUND CHECK Filed. Dec. 29, 1923 Patented Jan. 5, 1926.

UNITED STATES PATENT OFFICE.

NORRIS F. Mo'NAUGI-IT, OF CHICAGO, ILLINOIS.

REBOUND CHECK.

Application filed December 29, 1923. Serial No. 683,347.

To all whom it may concern:

Belt known that I, NORRIS F. MCNAUGHT, a! citizen of the United States, residing at Ch cago, in the county-of Cook and State of Illinois, have invented certain new and use ful Im" *ov'einents in Rebound Checks, of which tlie following is a specification.

Thls invention has to do with certain improvements in connection with shock absorbers and like devices; more particularly it is concerned with devices for absorbing a largeportion of the energy of the recoil of vehicle axles and springs when passing over uneven surfaces.

he construction herein illustrated and particularly described is intended for use especially with that type of device in which a suitable form of strap is connected at one end to the axle or vehicle spring, and at the other end to a retracting spring which takes up the slack of the strap when the vehicle spring is compressed. Still more particularly the present invention has to do with improvements in devices of the foregoing type which are so arranged that the strap passes in contact with a friction surface which it engages with a larger amount of pressure and resultant friction on the recoil of the vehicle spring than on the initial impact thereof.

In the foregoing type of device the efiectiveness of the device forabsorbing the energy of the recoil dep'endslargely upon the amount of frictional contact established between the strap and the surface which it engages during the recoil; since themain purpose of the checking spring is to take up the slack of the strap during the compression of the vehicle spring and to oppose the withdrawal ofthe strap during the recoil in such a way as to increase the effectiveness of the friction.

The main object of the present invention is to provide, in devices of this character, means supplemental to the strap and checking spring, for increasing the frictional engagenient of the strap with the friction surface during the recoil. In thisconncction, a further object is to provide an adjustment whereby the amount of this supplemental action may be easilyadjusted. by the mechanic without having to disassemble or open'up the check itself, and without having to re move the device or any portion thereof from the vehicle.

A further object in connection with the foregoing is to provide suitable convenient indicating devices which may be readily observed by the mechanic to guide him in makingthe foregoing adjustment-s.

A further object in connection with the foregoing is to so arrange and establish this supplemental friction generating device that it will work in perfect harmony and cooperation with the friction surface of the device itself so as to produce a maximum of absorbing action.

Other objects and uses of the invention will appear from a detailed description of the same, which consists in the features of construction and combinations of parts hereinafter-described and claimed.

In the drawing:

Fig. 1 shows a face view of a device em bodying the features of the present invention with the cover plate removed so as to better illustrate the interior construction;

Fig. 2 sh ws a vertical section through the device, taken substantially on the line 2-2 of Fig. 1, looking in the direction of the arrows, the cover plate being in place in Fig. 2, but shown in section;

Fig. 3 shows an end view of the cam block of Figs. 1 and 2;

Fig. a shows a longitudinal section on the line 4-4 of Fig. 3, looking in the direction of the arrows; and

Fig. 5 is a fragmentary inverted face view of the shell at the point where the opening for the strap is formed.

Referring first to the construction illustrated in the drawing, the device includes a base plate 7 intended for direct attachment to a convenient portion of the vehicle chassis, such as one of the frame side bars. attachment is conveniently made by a bolt passing through the hole 8 of the device. This hole is locatedwell over towards one end of the device, since the balance of force is such that this can be done and retain the device securely in place by the use of a single bolt.

Adjacent to the base plate 7 is journalled a drum 9 upon a stud l0 reaching out from the base plate. A coiled spring 11 is placed within the drum and has one end connected to the drum and the other end to a station curved form and preferably lies along the This upper edge portion of the device. ,'A bracket 13 may be secured to one end of the flange 1-2 by a series of rivets 1 1, said bracket reaching over far enough to establish a supplemental bearing for the stud 10 upon which the drum is journaled.

A strap 15 of suitable fabric or special composition has its inner end 16 secured to the drum. In the normal position this strap encircles the major portion of the face of the drum, and then passes over the curved flange 12. The free end 17 of the strap passes away from the flange 12 and downwardly in a practically vertical direction for suitable attachment to the vehicle axle or spring.

\Vhen the vehicle spring is compressed, the pull on the strap is reduced and the spring 11 winds up the drum so as to take up the slack and keep the strap taut. On the recoil the pull on the end 17 must be sufficiently large to overcome the resistance of the strap passing over the flange 12 against the retracting force of the drum spring. The result is that the force necessary to unwind the strap is much larger than the force of the spring 11 itself, and a substantial amount of energy is dissipated in the form of heat generated by the friction of the strap passing over the flange.

According to my present invention I fur ther increase the frictional engagement of the strap on the flange during recoil by the use of an element which causes a deflection or sharp turn in the direction of the strap at or adjacent to the position of the flange 12. In the construction illustrated this takes the form of a pin or block 18 having a rounded and preferably circular surface 19, said pin being located in such a position as to deflect the strap in a rather sharp manner as indicated at 20 in Fig. 1. This deflection is caused at a point between the drum and the adjacent end of the flange 12, and, consequently, serves to largely increase the force necessary to withdraw the free end 17 of the strap during recoil.

As shown. the block 18 is circular in form and is provided with eccentric studs 21 and 22 on its ends. These studs are journaled in the base plate 7 and in the bracket 13 res'iectively. By turning the device the amount of interference with the travel of the strap can be adjusted owing to the eccentricity of the mounting of the block 18. This turning is easily accomplished by placing a suitable tool on the projecting head 23 of the block which has the flattened surfaces 2% and 25. An arrow 26 may be placed on this projecting head for comparison with u'iarltings 27 on the outside face of the device, so that the amount of interference can be adjusted. v

A set scre 28 is placed in the base plate 7 at a pro-per point for engagement with the stud 21, so that the device can be locked in the adjusted position.

Ordinarily a shell 31 is placed over the absorber, the game being provided with an opening at the point where the strap passes through. In order to prevent the strap from catching on its edges, the shell may be outwardly flared, as shown at 33 in Fig. 5, this being a desirable expedient inview of occasional friction between the strap and the shell which results from lateral movements of the stiap as an incident to its use.

lVhilc I have herein shown and described only certain embodiments of the features of the present invention, still I do not intend to limit myself to the same except as I may do so in the claims.

I claim:

1. In a rebound check. the combination with a spring retracted drum, a strap coiled on the drum and having one end secured thereto, a stationary curved friction plate adjacent to the drum, the. strap passing from the drum over the friction plate and having its free end adapted for attachment to a vehicle axle, whereby when said free end is released the strap is wound on the drum by the operation of the spring and when the free end is withdrawn the strap is unwound from the drmn and pulled over the friction plate against the tension of the spring to thereby absorb the energy of the rebound of the axle. of means for regulating the friction engagement of the strap on the friction plate during the rebound comprising a pin in contact with the outer face of the strap at a point adjacent to its travel over the friction plate, an eccentric mounting therefor, suitable markings designating the angular position of the pin, and means for locking the pin in adjusted position, substantially as described.

2. In a rebound check, the combination with a spring retracted drum, a strap coiled on the drum and having one end secured thereto. a stationary friction plate adjacent: to the drum, the strap passing from the lrum over the friction plate and having its free end adapted for attzu-hmcnt to a vehicle axle. whereby when said free end is released the strap is wound on the drum by the operation of the spring and when the free end iswithdrawn the strap is unwound from the drum and pulled over the friction plate a ainst the tension of the spring to thereby absorb the energy of the rebound of the axle, of means for regulating the friction engagement of the strap on the friction plate during the rebound comprising a pin in contact with the strap at a point adjacent; to its travel over the friction plate, an eccentric mounting therefor. and means for locking the pin in adjusted position, substantially as described.

3.1111 a rebound check. the combination with a spring retracted drum, a strap coiled on the drum and havingone end secured thereto, a stationary friction plate adjacent to the drum, the strap passing from the drum over the friction plate and having its free end adapted for attachment to'a vehicle axle, whereby when said free end is released the strap is wound on the drum by the operation of the spring and when the free end is withdrawn the strap is unwound from the drum and pulled over the friction plate against the tension of the spring to thereby absorb the energy of the rebound of the axle, of means for regulating the friction engagement of the strap on the friction plate during the rebound comprising a pin in contact with the strap at a point adjacent to its travel over the friction plate, and an eccentric mounting therefor, substantially as described.

4. In a rebound check, the combination with a spring retracted drum, a strap coiled on the drum and having one end secured thereto, a stationary friction plate adjacent to the drum, the strap passing from the drum over the friction plate and having its free end adapted for attachment to a vehicle axle, whereby when said free end is released the strap is wound on the drum by the operation of the spring and when the free end is withdrawn the strap is unwound from the drum and pulled over the friction plate against the tension of the spring to thereby absorb the energy of, the rebound of the axle, and means for regulating the friction engagement of the strap on the friction plate during the rebound comprising a pin in contact withthe strap at a point adjacent to its travel over the friction plate and in advance of the terminal edge of the friction plate, substantially as described.

5. The combination with two spring connected parts of a. rebound check mounted on the one part, a strap connected at one end to the other part, a spring actuated drum rotatably carried by the check and having a connection with the other strap end, and a L duplex friction means associated with the strap comprising a curved wall over which the strap is extended, the wall having in spaced relation to the drum one end around which the strap is bent, and an adjustable device between the wall end and the drum adapted to be projected toward the strap to deflect the same whereby its bend around the wall may be varied, substantially as described.

6. The combination with two spring connected parts of a rebound check mounted on the one part, a spring actuated rotatable drum carried by the check, a curved wall associated with the drum with one end spaced therefrom, a strap connected with the drum and extended therefrom over the curved wall to the other part for connection therewith, and an eccentric device carried by the check adjacent the strap between the drum and said wall end adapted for movement toward and from the strap whereby the latter may be deflected, substantially as described.

7. The combination with two spring connected parts of a rebound check mounted on the one part and including a base plate from which upstands a curved friction wall and a stud in spaced relation thereto, a drum mounted for rotation about the stud, spring means associated with the drum for rotatin the same in one direction, a strap connecte with the drum and passing therefrom over the friction wall to connect with the other part, a bracket connecting the wall with the stud, and a rotatable block having an eccentric mounting between the base plate and bracket and extended in proximity to the strap intermediately of the drum and wall, the block being adapted to deflect the strap in its passage toward the wall, substantially as described.

8. The combination with two spring connected parts of a rebound check mounted on the one part, the check including in its structure a base plate whereon is carried its several components, a connection from the check to the other part comprising a flexible strap adapted for movement relative to certain of the check components. and a housing removably attached to the base plate having in one of its walls an opening through which the strap is passed, the housing walls adj acent the opening and on two edges at right angles to each other being flared away from the strap whereby to provide rounded edges for occasional engagement therewith and to thereby eliminate sharp edges fraying the belt edges, substantially as described.

9. The combination with two spring connected parts, of a rebound check mounted on the one part and having a strap extended therefrom to connect with the other part, and a housing for the rebound check removably associated therewith having in one of its walls a slot through which the strap'is laterally receivable and freely movable, the walls of the housing slot immediately adja cent to the edge of the strap being flared outwardly from the strap whereby to present a rounded edge for occasional engage ment therewith to thereby eliminate a sharp edge fraying the belt, substantially as described.

NORRIS F. MGNAUGHT.

Images