US3375905A - Lift frame adapter - Google Patents

Description

April 2, 1968 c. E. swlcK, JR

LIFT FRAME ADAPTER 3 Sheets-Sheet l Original Filed March 29, 1965 2M MM WOP/UEX April 2, 196s G. E'. SWICK, JR 3,375,905

LIFT FRAME ADAPTER Original Filed March 23, 1965 3 Sheets-Sheet 2 INVENTOR. 66011;@ ifa/1&3; .7'1.

@frana/5% April 2, 196s Original Filed March 29, 1965 G. E. SwlCK, JR

LIFT FRAME ADAPTER 5 Sheets-Sheet 3 United States Patent O 3,375,905 LIFT FRAME ADAPTER George E. Swick, Jr., Springfield, Ill., assigner, by mesne assignments, to Dura Corporation, a wholly owned subsidiary of Walter Kidde & Company, Inc., Oak Park, Mich., a corporation of New York Continuation of application Ser. No. 443,586, Mar. 29, 1965. This application Dec. 27, 1966, Ser. No. 605,082 14 Claims. (Cl. IS7-8.74)

ABSTRACT F THE DISCLOSURE This invention relates to -an adapter for use on vehicle hoists in connection with small automobiles, particularly foreigncars, and more particularly `cars having a torsion housing at the rear of the vehicle land/or an independant rear end suspension. The adapters, two of which are required, comprise an inverted channel shaped frame member which is designed to be secured as by welding to one end of the supporting frame of the lift, one on each side thereof. The support member is pivotably mounted on the channel shaped frame for pivotable movement from a vertically erect vehicle supporting position to a horizontally collapsed position. A spring connected to the support member ybiases it `to its vertically erect position. A ground engaging actuator pivoted to the channel shaped frame at one end and to the support member at the other end upon engagement with the ground as the lift is being lowered pivots the support member to its horizontally `disposed position on the frame member against the bias of the spring. As the lift is raised from its lowermost position, the pressure of the actu-ator on the ground is relieved, permitting the spring to elevate the support member to its support position. In one modification of the invention an adjustable connection is provided between the support member and the actuating member to vary the position of the support member when the actuating member is erect.

This application is a continuation of applicants co pending application Ser. No. 443,586, led Mar. 29, 1965, for Lift Frame Adapter, now abandoned, which was in turn a continuation-impart of applicants copending application Ser. No. 250,031, led Jan. 8, 1963, for Lift Frame Adapter, now abandoned.

This invention relates to vehicle hoists in general and more particularly to an adapter for use with the undercarriage supporting superstructure or frame of such hoists and lifts.

Most vehicle hoists and lifts are unsuited for lifting small automobiles, and particularly certain small foreign cars, Without some modification of their undercarriage supporting superstructure or frame. This is particularly true with those cars having a torsion housing at the rear end of the vehicle and/ or independent rear suspension.

A vehicle hoist which is adapted for lifting vehicles with torsion housings, for example, is required to have some form of elevated supp-ort t-o receive and accommodate such housings before the main lift frame contacts other underbody parts of the vehicle. This may be an adapter that is added to the hoist frame and includes a part that can be erected when a vehicle is to be lifted and which can be removed or retracted when not required. Generally, the adapter, or a positionable part thereof is made removable or retractable to avoid a safety hazard when the hoist is at ground level and no vehicle is on the hoist. This is also advisable to afford reasonable clearance for positioning low slung vehicles over 4the hoist.

Heretofore, most of these torsion housing and like adapters have been physically positioned and removed from the lift frames or they have been hinged tothe frame and have required separate manual operation. Previous efforts to provide an automatic type adapter have involved too complicated and expensive a structure for practical use.

It is an object of this invention to provide an adapter for undercarriage -supporting frames and superstructures of vehicle hoists and lifts which will accommodate a vehicle h-aving a torsion housing and which includes a positionable part that is automatically disposed for use when required and retracted when not needed.

It is an object of this invention to provide a simple and inexpensive adapter including a minimum of parts, simple in construction, readily assembled, and cooperatively arranged for most eflcient operation.

-It is also an object of this invention to provide an adapter having a positionable part that is self-erecting and collapsible in keeping with the vehicle carrying or retracted disposition of the hoist frame on which disposed.

Another object of this invention is to provide a self positionable frame adapter vfor use with vehicle hoists and one which is operable substantially with the hoist and with a minimum of hoist travel.

More specifically, it is an object of this invention to provide an adapter having a pivotal support which is biased to assume a vertically erect position and which has a lever member operatively engaged thereto and disposed for ground engagement to fold the support down in a horizontally collapsed position when the hoist is -at ground level.

These and other objects and advantages to be gained in the practice of this invention will be more apparent upon a reading of the following specification having reference to preferred embodiments of this invention and with particular reference to the accompanying drawings wherein:

FIGURE 1 is a perspective View of a vehicle on a hoist having an undercarriage frame with one embodiment of this invention provided thereon.

FIGURE 2 is a different and enlarged perspective View of the undercarriage frame shown by FIGURE l with the adapters shown in greater detail on the far end thereof.

FIGURE 3 is an enlarged an partially cross-sectioned side View of one of the adapters as seen generally in the direction of the arrow A in FIGURE 2.

FIGURE 4 is an end view of the adapter shown by FIGURE 3 with a torsion housing shown in phantom as supported thereby.

FIGURE 5 is similar to FIGURE 3 with the positionable support member shown disposed in a horizontally collapsed position.

FIGURE 6 is an enlarged and partially cross-sectioned side view of another embodiment of the invention.

FIGURE 7 is an end View of the embodiment of the invention illustrated in FIGURE 6.

FIGURE 8 is a cross-sectional view of the structure illustrated in FIGURE 6, showing the positionable support member in a horizontally collapsed position.

Referring to the drawings in further detail:

A vehicle 10 is shown in FIGURE l as dis-posed on a lift hoist 12 and supported on the undercarriage engaging frame or superstructure 14 thereof. The vehicle is shown as raised up in the air on the single lift post 16 and as seen from a position on the ground and at a slight distance back. The lift frame 14 is disposed between the front and rear wheels of the vehicle and is engaged with the vehicle frame at the front end and with the torsion housing for the rear wheels at the back end of the car. Since this arrangement is well known and understood in the trade no detailed showing thereof has been considered necessary.

The undercarriage supporting frame 14 of the lift l2 is best shown by FIGURES 2. It includes a frame member or bolster 18 which is bolted to the lift post 16 and has frame extensions 28, 22 and 24 provided on the front end thereof with contact pads 26, 28 and 3@ respectively provided on the extensions. The extensions are welded to the frame member and the contact pads are normally wooden blocks factened thereto by any convenient means.

The back end of the supporting frame member 18 is cut-out as at 32 to provide an access opening for servicing a vehicle on the hoist. The adapters 34 of this invention are welded to the sides of the frame member 18 on opposite sides of the access cut-out 32.

The adapters 34 are identical in construction and so only one of them need be described in detail. It will be understood however that reference to inward and outward dispositions and movements of adapter parts refers to their disposition as installed on the undercarriage support frame 14.

The adapters 34 include a frame member 36 which is an inverted channel sectioned member and which is intended to be welded to the side edge of the frame member part.

A support member 38 is pivotally mounted on the frame member 36 near its outer end. It includes a transversely disposed saddle block or plate 40 with lateral flanges or webs 42 and 44 which extend back and down to overlap the sides of the frame member 36 and for pivotal engagement therewith. Simple pivot pins 46 are press-lit into the sides of the frame member and the depending ends of the support member flanges 42 and 44 are engaged thereon.

It will be appreciated that the support member 38 has its pivotal axis offset from the saddle block or plate 40 and the latter is accordingly pivotally positionable from a horizontally disposed disposition on the frame member, as shown by FIGURE 5, to a vertically erect disposition as shown by FIGURE 3. The latter position is attained when the lower extremity 41 of the saddle block or plate 40 seats on the end of frame member 36 and is stopped thereby.

The frame member part 36 of the adapters 34 will be noted to include a slot 48 in the upper wall which is open to the end thereof. The slot 48 is offset from the centerline of the frame part, for reasons later explained, and receives a centrally disposed and depending part t) of the positionable support 38 therethrough.

Referring to FIGURE 4 first, and then FIGURES 3 and 5, it will be seen that the depending part 50 extends from the saddle block or plate 48 and beyond the pivotal axis of the connection with the frame member part 36. Accordingly, it provides a moment arm for actuation of the positionable support 38 and in subsequent discussion will be referred to in this regard.

lt will be noted that the moment arm 58 also includes a lateral extension or foot 52 which extends inward below and beyond the pivotal axis of the connection of the support 38 on the frame member 36 when the support is erect. A spring 54 is attached to a rivet 56 on the foot 52 and to a post or shaft 58 extended between the side walls of the frame member 36 at a distance removed therefrom. This imposes a biasing force on the support 38, through the moment arm 50, which tends to hold it Vertically erect.

A cam lever 68 is pivotally connected at one end, on the spring anchoring post or shaft S8 and has the other end operatively engaged to the moment arm '50 of the support 38. The outwardly extended end of the cam lever is formed to include a cam slot 62 in which is received an actuator pin 64 protruding from one side of the moment arm S0 near its lower end.

The bell crank'shaped cam lever 68 has the angular part 66 thereof formed to extend below the side walls of A, the frame member 36 in which it is disposed when the support 38 is erected. In such position it is disposed for ground engagement, as shown by FlGURE 5, causing pivotal actuation thereof about shaft 58, and actuation of the moment arm 58, via the pin 64, to fold the support 38 into a horizontally collapsed position.

Although not shown, it will be appreciated that a foot-pad screw may be provided on the elbow or knee bend 66 of the cam lever e8 to afford ground contact adjustment where drainage requirements or other causes produce a sloping or uneven floor.

The cam lever 68 is kept in a centrally disposed relation on the shaft 58 by a spacer 68 and the fact that its end overlaps the moment arm foot 52.

The frame member slot 48 is wide enough to receive the cam slotted end of the lever 60 therethrough and, as mentioned, is offset for such purposes.

The adapters 34 as provided on a lift post frame 14 operate as follows:

When the lift 12 is down and positioned to receive a vehicle, the cam levers 60 are engaged with the ground and the supports 38 are folded down as shown by FIG- URE 5 and as last described.

When the undercarriage supporting frame 14 is raised up, the spring 54 acts on the moment arm 58 to pull the support 38 to an erect position as shown in FIGURES 2-4. It will be noted that the spring 56 never travels over-center with respect to the pivotal axis of the support member 38. lt is always disposed to exert a lifting force on the support by the pull imposed on the depending moment arm.

The supporting member 38 reaches its fully erected position within the first few inches of lift frame travel. As the lift frame starts its rise the ground holding force on the cam lever 68 is relieved and the spring 56 begins to pull the support erect. When the lift frame is elevated sufficiently for the cam lever to lose ground contact the support is fully erected. This occurs easily within the travel afforded the lift frame before contact with the undercarriage of any part of the vehicle to be hoisted and so that contact is made through the adapter and the other contact points simultaneously.

When the lift frame 114 is lowered and the cam levers 60 malte ground contact, the support members 38 are folded down and out of the way. This is after the wheels of the vehicle have made ground contact and as the lift frame is lowered further from engagement with the undercarriage of the vehicle.

Another embodiment of the invention is illustrated in FIGURES 6 through 8, and is comprised of adapters 70 which are Welded to the sides of the frame member 18 on opposite sides of the access cut-out 32 in the same manner that the adapters 34 are welded thereto. The adapters 78 are identical in construction and therefore only one of them is illustrated and described in detail.

The adapters 70 include a frame member 72 which is an inverted channel sectioned member and which is Welded to the side edge of the frame member 18. A support member 74 is pivotally mounted on the frame member 72 near its outer end. The support member 74 includes a transversely disposed saddle block portion 76 and lateral flange portions 78 and 88 which extend downwardly and overlap the sides of the frame member 72. The flange portions 78 and 88 are pivotally connected to the frame member 72 by a pivot shaft 82 which extends through the sides of the frame member 72 and the flange portions '78 and 80. It will be appreciated that the support member 74 has its pivotal axis offset from the saddle block portion 76 and the latter is accordingly pivotally positionable from a horizontally disposed position as shown in FIGURE S, to a vertically erect position as shown in FIGURE 6. The latter position is attained when the lower extremity 84 of the saddle block portion seats on the end of the frame member 72 and is supported thereby.

The frame member 72 includes a centrally disposed slot 86 in the upper wall thereof which is open to the end thereof. The slot 86 receives a centrally disposed depending actuating arm 88 provided integral with the support member 74. As shown in FIGURE 7, the actuating arm 88 extends downwardly from the saddle block portion 76 and beyond the pivotal axis of the connection with the frame member 72. Accordingly, the arm 88 provides a moment arm for actuation of the positionable support 74. The actuating arm 88 includes a lateral extension or foot portion 90 which extends below and beyond the pivotal axis of the connection of the support 74 on the frame member 72 when the support is erect. A spring 92 is provided, one end portion of which is secured to the foot portion 90, as at 94, while the opposite end portion of the spring is secured to a shaft 96 extending between the side walls of the frame member. The spring 92 imposes a biasing force on the support 74 through the actuating arm 88 which tends to hold the support member 74 vertically erect.

A relatively wide lever actuating member 98 is provided, one end portion of which is provided with bosses 100 and 102 which are pivotally mounted on the shaft 96. The opposite end portion of the member 98 projects downwardly between the sides of the frame member 72 and is provided with a curved, ground engaging foot portion 104 which, as shown in FIGURE 7 and 8, provides relatively large sliding area contact with the oor so as to reduce stress concentrations and minimize Hoor damage as the foot portion 104 slides on the tloor.

The member 98 also includes a centrally disposed upwardly projecting flange portion 106, and an adjustable connecting member 108 is provided which operatively connects the member 98 to the support member 74 and which is effective to lower the support member 74 in response to movement of the member 98 as it engages the oor when the hoist is lowered. The member 108 is comprised of a pair of spaced clevis members 110 and 112. The clevis 110 is pivotally connected to the ange 106 by a clevis pin 114 which extends through the flanges 116 and 118 of the clevis 110 and the ange 106. The clevis 112 is pivotally connected to the actuating arm 88 by a clevis pin 120 which extends through the anges 122 and 124 of the clevis 112 and through the arm 88. A bolt 126 is provided which threadably engages a threaded bore defined by the central portion of the clevis 112, thel head 128 of the bolt being threaded tight against the upper surface 130 of the central portion of the clevis 112 so that the bolt is held tightly by the jam action of the head of the bolt against the clevis 112. The threaded body portion 132 of the bolt 126 extends through a threaded bore 134 provided in the central portion of the clevis 110. With such a construction ground contact height adjustment of the end portion 104 of the member 98 can be effected where drainage requirements or other causes produce a sloping or uneven iloor. Such adjustment is accomplished by removing the clevis pin 114, threading the clevis 110 up or down on the bolt 126 so as to secure the desired spaced relationship between the end portion 104 of the member 98 and the arm 88, and then replacing the pin 114 which is preferably retained by a cotter pin.

The lower end portion 104 of the member 98 projects below the side Walls of the frame member 72. In such a position it is disposed for floor engagement, as shown in FIGURES 6, 7 and 8 causing pivotal actuation thereof about the shaft 96 and actuating the moment arm 88 through the clevis 110, bolt 126 and clevis 112 to fold the support member into a horizontally collapsed position. Since floor contact is made near the extreme end portion of the member 98, maximum leverage for effective pivotal movement of the support member 74 is obtained by this embodiment of the invention.

In the operation of this embodiment of the invention; when the lift 12 is down and positioned to receive a vehicle, the member 98 on each adapter 70v is engaged with S the floor and the supports 74 are folded down as shown in FIGURE 8. When the undercarriage supporting frame 14 is raised, the spring 92 acts on the moment arm 88 of the support member to pull the suport member 74 to an erect position as shown in FIGURES 6 and 7. It will be noted that the spring 92 never travels over center with respect to the pivotal axis of the support member and that the spring 92 is always disposed to exert a lifting force on the support member 74 by the pull imposed on the depending moment arm 88.

The saddle block portion 76 of the support member 74 reaches its fuly erect position within the rst few inches oflift frame travel. As the lift frame starts its rise, the ground holding force on the mmeber 98 is relieved and the spring 92 begins to pull the support member 74 erect. When the lift frame is elevated sufficiently for the member 98 to lose ground contact, the support member 74 is fully erected. This action occurs within the travel afforded the lift frame before contact with the undercarnage of any part of the vehicle to be hoisted and so that contact is made through the adapters 70 and the other contact points simultaneously.

When the lift frame is lowered and the foot portion 104 of the member 98 makes contact with the iioor, the support members 74 are folded down and out of the Way. Such action occurs after the wheels of the vehicle have made ground contact and as the lift frame is lowered further down from engagement with the undercarriage of the vehicle.

While preferred embodiments of the invention have been shown and described, it will be understood that various changes and modifications may be made without departing from the spirit of the invention:

I claim:

1. A lift frame adapter for a vehicle lift comprising, in combination, a frame member, a support member, means pivotally connecting said suppolt member to said frame member whereby said support member is positionable between vertically erect and horizontally collapsed positions relative to said frame member, spring means connected between said frame member and said support member and biasing said support member toward said vertically erect position, and an actuating member, one end portion of said actuating member being pivotally connected to said frame member, means adjustably connecting the other end portion of said actuating member to said support member, said last named means being adjustable to vary the position occupied by said actuating member when said support member is vertically erect and said other end portion of said actuating member bemg exposed -for ground engagement to eect pivotal actuation of said support member from said vertically erect position to said horizontally collapsed position, said adapter being adapted to be oriented on the vehicle lift so that the axis about which the said support member pivots extends longitudinally of a vehicle supported on the lift in the position in which vehicles are normally supported thereon.

2. A lift frame adapter as described in claim 1 in which the pivotal connection between the said actuation member and the frame member is at one end of the actuating member.

3. A lift frame adapter for a vehicle lift comprising, in combination, an inverted channel shaped frame member having an open slot provided at one end and in the web thereof, a support member pivotally supported on the side walls of said frame member and having an arm portion thereon extending through said slot, said support member being formed and adapted to stand vertically erect on said frame member and to lie horizontally collapsed and substantially flat thercover, an actuating member, one end portion of said actuating member being pivotally supported on the side walls of said frame member, said actuating member having the other end portion thereof pivotally connected to said arm portion of said support member, a portion of said actuating member being exposed below said frame member when said support member Stands vertically erect thereover for ground engagement which is operative of said support member to a collapsed position, and means connected between said frame :member and said arm portion of said support member and effective to bias said support member toward said vertically erect position, said adapter being adapted to be oriented on the vehicle lift so that the axis about which the support member pivots extends longitudinally of a vehicle supported on the lift in the position in which vehicles are normally supported thereon.

4. A lift frame adapter as described in claim 3 in which the means biasing said support member toward vertically erect position is spring means.

5. A lift frame adapter as described in claim 3 in which the connection between the said actuating member and the said support member comprises a pin and circular `opening in which the said pin is pivotably positioned.

6. A lift frame adapter as described in lclaim 3 in which the said actuating member comprises a pair of later-ally spaced 4arms pivotally supported adjacent their inner ends on the side walls of the said frame member and joined adjacent their outer ends by a cross member which is the ground engaging portion of said actuating member.

'7. "A lift `'frame adapter as described in claim 3 in which the connection between the said actuating member and the said support member is adjustable to lvary the position occupied by said actuating ymember when said support member is vertically erect.

S. A lift frame adapter as described in claim l in which the said adjustable connection includes a pair of members each having threaded openings therein and a member threadingly engaged in both of said openings, said members having the threaded openings therein being pivotally mounted, respectively, on said support member and on said actuating member.

9. A lift frame adapter for a vehicle lift comprising, in combination, an inverted channel shaped frame member having an open slot provided at one end and in the web thereof, -a support member pivotally connected Ito to said frame member and having an arm portion thereon extending through said slot, said support member being formed and adapted to stand vertically erect on said member and to lie horizontally collapsed and substantially at thereover, an actuating member, one end portion of said actuating member being pivotally connected to said frame member at a position remote from the pivotal connection of said support member to said frame member, means adjustably connecting said actuating member to said arm portion of said support member, said last named means being adjustable to vary the position occupied by said actuating member when said support lmember is vertically erect and said other end portion of said actuating member having a relatively large area exposed below said frame member for ground engagement to effect pivotal movement of said actuating member and to pivot said support member lfrom a vertically erect position to a collapsed position, and spring means connected between said frame member and said ar-m portion of said support member and effective to bias said support member toward said vertically erect position, said adapter being adapted to be oriented on the vehicle lift so that the axis about which the said support member pivots extends longitudinally of a vehicle supported on the lift in the position in which vehicles are normally supported thereon.

1t). A lift frame adapter as described in claim 9 in which the pivotal connection between the said actuating member and the frame member is at one end of the actuating member.

1i. A lift frame adapter for a vehicle lift comprising, in combination, an inverted channel shaped frame member having an open slot provided at one end and in the web thereof, a support member pivotally connected to said frame member and having an arm portion thereon extending through said slot, said support member being formed and adapted to stand vertically erect on said frame member and to lie horizontally collapsed and substantially iiat thereover, an actuating member, one end portion of said actuating member being pivotally connected to said frame member, means including a threaded member adjustably connecting the other end portion of said actuating member to said arm portion of said support member, said last named means being adjustable to vary the position occupied by said actuating member when said support member is vertically erect and said other end portion of said actuating member having a relatively large area exposed below said frame member for ground engagement to effect pivotal movement of said -actuating member and to pivot said support member from a vertically erect position to a collapsed position, and an elongate tension spring connected between said frame member and said arm portion of said support member and efective to bias said support member toward said vertically erect position, said adapter being adapted to be oriented on the vehicle lift so that the axis about which the said support member pivots extends longitudinally of a vehicle supported on the lift in the position in which vehicles are normally supported thereon.

12. A lift frame adapter comprising, in combination, an inverted channel shaped member having an open slot provided at one end and in the web thereof and a member pivotally engaged thereto and having a part extended through said slot, said pivotally engaged member being formed and adapted to stand vertically erect on said inverted channel shaped member and to lie horizontally collapsed and substantially at thereover, a bell crank shaped lever arm received in shielded protection within the downwardly open inverted channel shaped member and having one end pivotally engaged thereto, said bell crank shaped lever arm having the other end thereof operatively engaged to the extended part of the member pivotally engaged on said inverted channel shaped member and at all times operative therewith, the intermediate angular part of said bell crank shaped lever arm being exposed below said inverted channel shaped member when said pivotally engaged member stands vertically erect thereover for ground engagement which is operative of said pivotal mmber to a collapsed position, said bell crank shaped lever arm having cam slot engagement with the extended part of said pivotally engaged member, and said slot and bell crank shaped lever arm being formed for the receipt and extension thereof through said slot in the collapsing of said pivotally engaged member over said inverted channel shaped member.

13. A lift frame adapter comprising, in combination, an inverted channel shaped member having an open slot provided at one end and in the web thereof and a member pivotally engaged thereto and having a part extended through said slot, said pivotally engaged member being formed and adapted to stand vertically erect on said inverted channel shaped member and .to lie horizontally collapsed and substantially fiat thereover, a bell crank shaped lever arm received in shielded protection within the downwardly open yinverted channel shaped member and having one end pivotally engaged thereto, said bell crank shaped lever arm having the other end thereof operatively engaged to the extended part of the member pivotally engaged on said inverted channel shaped member and at all times operative therewith, the intermediate angular part of said bell crank shaped lever arm being exposed below said inverted channel shaped member when said pivotally engaged member stands vertically erect thereover for ground engagement which is operative of said pivotal member to a collapsed position, said bell crank shaped lever arm having cam slot engagement with the extended part of said pivotally engaged member, and said slot and bell crank shaped lever arm being formed for the receipt and extension thereof through said slot in the collapsing of said pivotally engaged member over said inverted channel shaped member, the extended part of said pivotally engaged member including an angular part on the terminal end thereof and having spring means engaged therewith for biasing `such member to a vertically erect stance.

14. A lift frame adapter comprising, in combination, an inverted channel shaped member having an open slot provided at one end and in the web thereof and a member pivotally engaged thereto and having a part extended through said slot, said pivotally engaged member being formed and adapted to stand vertically erect on said inverted channel shaped member and to lie horizontally collapsed and substantially a-t thereover, a bell crank shaped lever arm received in shielded protection within the downwardly open inverted channel shaped member and having one end pivotally engaged thereto, said bell crank shaped lever arm having the other end thereof operatively engaged to the extended part of the member pivotally engaged on said inverted channel shaped member and at all times operative therewith, the intermediate angular part of said bell crank shaped lever arm being exposed below said inverted channel shaped member when said pivotally engaged member stands vertically erect thereover for ground engagement which is operative of said pivotal member to a collapsed position, said slot being laterally odset as provided in the web of said inverted channel shaped member, said bell crank shaped arm being laterally offset with said slot as pivotally engaged to said inverted channel shaped member and having cooperative cam slot engagement with the extended part of said pivotally engaged member on one side thereof, the cam slot engagement end of said bell crank shaped lever being formed and extended fOr being received through said web slot in the collapsing of said pivotally engaged member over said inverted channel shaped member, the extended ends of said pivotally engaged member having an angular part provided on Ithe terminal end thereof, and spring means engaged between said inverted channel shaped member and said angular part, on the side thereof opposite said bell crank shaped lever arm, for vertically erect biasing thereof.

References Cited UNITED STATES PATENTS 1,818,016 8/1931 Steedman 187-8.74 1,936,107 11/1933 Cunneen 187-8.52 1,955,586 4/1934 Hott IS7- 8.52 2,052,119 8/1936 Tear 187--852 2,066,916 1/ 1937 Thompson IS7-8.52 2,074,148 3/1937 Hott IS7-8.59 2,098,376 11/ 1937 Cunneen l87-8.52 2,153,891 4/1939 Hott IS7- 8.52 2,569,982 10/ 1951 Estel 187-8.52 3,048,238 8/1962 Wallace 187-852 EVON C. BLUNK, Primary Examiner. H. C. HORNSBY, Assistant Examinez'.

UNITED STATES PATENT oEEICE CERTIFICATE OF CORRECTION Patent No. 3,375,905 April 2, 1968 George E. Swick, Jr.

It is certified that error appears in the above identified patent and that said Letters Patent are hereby corrected as shown below:

Column Z, line 45, "an", second occurrence, should read and Column 3, line 4, "FIGURES" Should read w- FIGURE line l0, "factened" should read fastened Column 4, line 17, "purposes" should read purpose Column 6, line l2, "fuly" should read fully line 14, "mmeber" should read member line 60, "actuation" should read actuating Column 7 11n@ l0 a after "the" insert said line 4l, "to to said" should read to said Signed and sealed this 19th day of August 1969.

(SEAL) Attest:

WILLIAM E. SCHUYLER, IR.

Edward M. Fletcher, Jr.

Commissioner of Patents Attesting Officer

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