US3234621A

US3234621A - Two piece tenter clip

Info

Publication number: US3234621A
Application number: US324753A
Authority: US
Inventors: Hyatt Frederick
Original assignee: Bevis Industries Inc
Current assignee: Bevis Industries Inc
Priority date: 1963-11-19
Filing date: 1963-11-19
Publication date: 1966-02-15
Anticipated expiration: 1983-02-15
Also published as: DE1460674A1; GB1013958A

Description

Feb. 15, 1966 F HYATT 3,

TWO PIECE TENTER CLIP Filed Nov. 19, 1963 2 Sheets-Sheet 1 25A l 4- IO zaA i I 27A I 24A V 4 INVENTOR.

FREDERICK HYATT flflwm 51m flame/7.

ATTORNEY Feb. 15, 1966 F. HYATT 3,234,621

TWO PIECE TENTER CLIP I 48A 96 47A 46A INVENTOR.

/ 24B IZA BY FEEDER/Ck HYATT ATTORNEY Unite This invention relates to a two piece tenter clip and more particularly to a tenter clip base having means to align and secure thereto various types of tenter clip cloth holding mediums and a new type of tenter chain pivot pin construction.

A tenter chain runs around sprockets located at a considerable distance from one another on the frame of a tentering machine. Between the sprockets the chain travels along an extended rail. There are two sets of rails, sprockets and chains on each tenter frame. The strip of cloth being processed is gripped along its opposite edges by the tenter clip gates and is gradually stretched sidewise as the rails diverge toward the discharge end. It is highly important that the gates "as a whole be maintained in substantial alignment as they move the cloth, in order that their pull on the cloth shall be as nearly uniform as possible. If the chain is permitted to whip, as it were, or if the gates are out of alignment, thus allowing relative displacement between gates, the effect on the cloth is most undesirable. With clips mounted on or attached to a roller chain, the matter of whip and alignment becomes quite a problem. This problem is magnified if a clip is made in two parts.

In processing yard goods, different types of cloth or material require different types of gates or holding mediums.

It is a principal object of the present invention to provide a form of construction for a tenter clip which will enable the holding mediums to be interchangeable on a common roller link chain without sacrificing gripping alignment or subjecting the chain to whip.

Another object of the present invention is to provide a two piece tenter clip which will reduce the initial cost of tentering machines and also reduce the cost of the tentering process.

In the past users of tentering machines found it necessary to have a plurality of tentering machines. Each machine was equipped with a roller chain carrying a plurality, numbering hundreds, of one of a variety of types of tenter clips from pin type to gate type with or without a controller. It was an arduous, time consuming task to replace a roller chain equipped with one type of tenter clip with another type of tenter clip. Therefore, several machines were always set up with different types of tenter clips. y In most instances many tentering frames stood idle while one was placed in operation. Floor space had to be provided for idle machines.

It is therefore an object of the present invention to make a tentering machine more versatile by providing a means for quickly and easily substituting one type of tenter clip for another type of tenter clip without sacrificing aligning qualities or without creating whip inefficiency and thus eliminate the necessity of having idle tentering machines and excess floor space.

Another object of the present invention is to provide a new type of roller link pivot pin which will allow the rapid replacement of a roller link.

Other objects of the present invention will become apparent in part and be pointed out in part in the following specification and claims.

Referring to the drawings in which similar characters of reference refer to like parts:

FIGURE 1 is a rear-end perspective view of the new and improved two piece tenter clip showing a gate type pivotally mounted gripping jaw.

States Patent "ice FIGURE 2 is a front perspective view of the same.

FIGURE 3 is a perspective view of the base element of the two piece tenter clip.

FIGURE 4 is a vertical section taken on line 44 of FIGURE 2.

FIGURE 5 is a plan view of two base members of a tenter clip chain.

FIGURE 6 is an exploded perspective view of the base elements comprising a tenter clip chain.

FIGURE 7 is a perspective view of a modified form of tenter clip gate attachable to the base element shown in FIGURE 3.

FIGURE 8 is a vertical sectional view taken on line 8-8 of FIGURE 7.

FIGURE 9 is a perspective view of a modified form, or pin type top, attachable to the base element shown in FIGURE 3.

FIGURE 10 is a perspective view of a modified form of base member.

In proceeding with this invention, a base member, generally indicated by reference numeral 10, is provided having a face 11, an integrally formed bottom 12 located at approximately a right angle to face 11, and projecting rearwardly of face 11, and an upper portion 13 integrally attached to face 11 substantially parallel to bottom 12 and at approximately a right angle to face 11 and projecting rearwardly of face 11. Face 11, bottom 12 and upper portion 13, form a C-shape section.

Upper portion 13 is provided with a step consisting of wall 14 parallel to face 11, a seating area and a tail portion 20. A groove is provided in the seating area whereby a groove seat 18 is created and

seats

15, 15A are formed along with front edge 16 and rear edge 17. A plurality of

screw threads

21, 22 are located in seat 15A.

Two vertical bores 7 and 8 are provided in base member 10. Each bore 7 and 8 consists of an upper section located in upper portion 13 and an aligned lower section located in bottom 12.

Roller links, generally indicated by

reference numerals

23 and 23A, comprise respectively,

lower plates

24, 24A,

upper plates

25, 25A,

spacing sleeves

26, 26A and 27, 27A.

Spacing sleeves

26, 27 are fastened to lower plate 24 and to upper plate 25.

Spacing sleeves

26A, 27A are fastened to lower plate 24A and upper plate 25A. Roller link 23 is provided with

bearings

30, 31. Roller link 23A is provided with

bearings

32, 33.

Roller links

23, 23A are well known in the art.

Applicant provides a novel and unique structural means for pivoting the

roller links

23, 23A to the base member 10 in the form of T-shaped pivot

pins comprising shanks

36, 37 and

heads

36A and 37A, respectively, which may be square shaped.

Pivot pins

36, 37 are adapted to slidably engage vertical bores 7, 8, respectively, with

square heads

36A, 37A located in groove seat 18 below

seats

15, 15A. Front edge 16 and rear edge 17 prevent

square heads

36A, 37A from rotating.

Pivot pins

36, 37 remain in vertical bores 7, 8 solely by the action of gravity.

Base member 10 is connected to and forms part of an endless chain of which

roller links

23, 23A form a part.

Roller links

23, 23A are pivotally connected to base member 10 in a new and different manner.

Roller links

23, 23A are slidably positioned between bottom 12 and upper portion 13 with

bearings

31, 33 aligned, respectively, with vertical bores 7 and 8.

Pivot pins

36, 37 are then dropped into vertical bores 7 and 8, respectively, and through

bearings

31, 33, respectively, to engage the lower section of the respective bores 7 and 8, with the bottom of

heads

36A, 37A resting in groove seat 18. To separate roller link 23 from base member 10, pivot pin 36 is merely lifted out of position in vertical bore 7. In this manner, the riveting of the 3 pivot pin is eliminated and the pivot pin can be made larger and stronger than prior construction permitted.

Lower plates

24, 24A are supported [by bottom 12 (see FIGURES 1, 2, 3,4 and 6).

One of a variety of superstructure gripping elements used in the tentering operation is generally indicated by reference numeral 50 and comprises a horizontally disposed bottom 51, a vertically upstanding body provided with a cross arm 52, a pair of

arms

53, 54 which project sidewise as a continuation of said upstanding body and forward of said cross arm 52 to overlie said horizontally disposed bottom 51, and a movable jaw 55. A pintle 56 is mounted in bearings provided in said pair of

arms

53, 54. Jaw 55 is freely or loosely hinged to pintle 56 to be normally free to move automatically into vertical relation with horizontally disposed bottom 51, under the action of gravity or a spring 57 may be provided to assist the forces of gravity. Horizontally disposed bottom 51 is provided with a seating pad 48, an aligning edge -47 and a clearance surface 46.

Movable jaw 55 is provided with an operating leg adapted to be actuated by a cam (not shown) which pivots jaw 55 into material (cloth or film) release position.

A tenter clip gate 59 is pivotally mounted to movable jaw 55 by means of a shaft 61. Body member 59 is counterweighted and provided with oppositely aligned

bearings

62, 63. Body member 59 is provided with a show'face 64 terminating in an arcuate surface 65 the radius of which is on the vertical center of gravity of body member 59. The vertical center of gravity is located to the rear of the vertical center of shaft 61. Inspection of FIGURES 1, 2 and 4 will show that body member 59 engages clamping area 58 in a toggle action provided by means of pintle 56 and shaft 61.

Body member 59 is provided with a heel 66 which is of sufiioient size and weight to form a counterbalance so that as the body member 59 pivots freely upon shaft 61 heel 66 will hang downwardly to initially engage clamping area 58 and pivot shoe face 64 into engagement with clamping area 58.

The Tenter Clip Gate just described is the subject of United States Patent No. 3,023,479 which issued to John Crandon Nash, on March 6, 1962.

Cross arm 52 may be provided with a circular recess 69. A projection 68 may be provided on movable jaw 55. A coil spring 57 is interposed between circular recess 69 and projection 68 to assist the forces of gravity to pivot movable jaw 55 and shoe face 64 into clamping area 58 position as shown in FIGURES 1, 2 and 4 when operating leg 20 disengages the cam (not shown). Obviously, shoe face 64 will grip a web of cloth or film interposed between shoe face 64 and clamping area 58.

This auxiliary force, described herein as a coil spring is the subject of United States patent application Serial No. 161,177 filed December 21, 1961, by John Crandon Nash for a Tenter Clip With Auxiliary Closing Mechanism and now US. Patent No'. 3,120,688.

The older and more conventional type of tenter clip gate is illustrated in FIGURES 7 and 8 and a prior art type pin clip plate is illustrated in FIGURE 9, the construction of which is the subject of United States Patent No. 3,058,191 which issued to John Crandon Nash on October 16, 1962, for a Two Piece Tenter Clip, and of which the present patent application is an improvement thereover.

In US. Patent No. 3,058,191 the gripping element is aligned to the base member by means of an aligning edge which engages the guide rail engaging face for transverse alignment and a pair of ears provide lateral alignment.

The present invention overcomes the problem of providing a two piece tender clip which not only will withstand greater pulling forces created by the cloth being tentered but the construction of which admits of rapid ments.

replacement of worn or broken chain links without removing the tenter chain from. sprocket engagement or away from the tentering frame to a remote position for repairs.

Reference is made to FIGURES 7 and 8 wherein is shown a modified form of gripping element 50A comprising a superstructure having a horizontally disposed bottom 51A, a vertically upstanding body 52A and a pair of

arms

53A, 54A which project sidewise from the body to overlie the bottom, and-a movable jaw 55A. A pintle 56A is mounted in bearings provided in said pair of

arms

53A, 54A. Jaw 55A, provided with a gripping surface 55B, is hinged to pintle 56A to be normally free to move automatically into vertical relation with clamping area 58A provided on horizontally disposed bottom 51A, under the action of gravity. Movable jaw 55A is provided with an operating leg 20A adapted to be actuated by a cam (not shown) which pivots jaw 55A into material release position. Material will be gripped between clamping area 58A and gripping surface 55B. Horizontally disposed bottom 51A is provided with a seating pad 48A, an aligning edge 47A and a clearance surface 46A.

Another type of superstructure, illustrated in FIGURE 9, is known to the trade as a pin clip, and is generally indicated by reference numeral 50B. Pin clip 50B consists of a horizontally disposed bottom provided with a seating pad 48C, an aligning edge 71 and a forwardly projecting platform 72. Platform 72 is provided with a plurality of pins 73 which are material holding ele- Bottom 70 is provided with two

orifices

74, 75, for purposes which will presently appear.

The modified form of base member illustrated in FIG- URE 10, is generally indicated by reference numeral 10A, and is provided with a face 11A, an integrally formed bottom 12A located at approximately a right angle to face 11A, and projecting rearwardly of face 11A, and an upper portion 13A integrally attached to face 11A substantially parallel to bottom 12A and at approximately a right angle to face 11A and projecting rearwardly of face 11A.

Upper portion 13A is provided with a step consisting of wall 14A parallel to face 11A, a seating area 15B and a tail portion 20A. A plurality of

screw threads

21A, 22A are located in seating area 15B.

Face 11A is provided with cut outs or windows, generally indicated by

reference numerals

80, 81. T-sh-aped pivot pins provided with square shaped

heads

36B, 37B are slidably positioned in vertical bores similar to those illustrated in FIGURE 6. However, in the modified form shown in FIGURE 10, the groove seat 18 is replaced with a pair of orifices adapted to accommodate

square heads

36B, 37B. The orifices are shaped to prevent said square heads from rotating and to be seated below surface 15B.

Roller links, generally indicated by reference numerals 23B, 23C, comprise respectively,

lower plates

24B, 24C, upper plates 25B, 25C, and in place of the spacing sleeves shown in FIGURES 1, 2, 3, 4 and 6, roller links 26B, 26C, 27B, 27C, are rotatively mounted upon the respective pivot pins, for example, roller link 27B is rotatively mounted upon pivot pin provided with square head 36B and roller link 27C is rotatively mounted upon pivot pin provided with square head 37B. Roller links 27B and 27C project, respectively, through

windows

80, 81 to engage the guide rail (not shown) in place of face 11, in the form shown in FIGURES 1, 2, 3, 4 and 6, engaging the guide rail (not shown).

In operation, a tentering machine chain will be assembled by providing a plurality of base members 10. Each base member 10' will be pivotally attached to the adjacent base member on opposite sides by means of

roller links

23, 23A, respectively. FIGURES 3 and 5 clearly illustrated this structural condition. The tenter chain as constituted, is then attached to the sprockets of the tenten'ng machine (not shown) with guide rail engaging face 11 adapted to slidingly engage the guide rail (not shown) of the tentering machine.

It will be observed that the base members are unencumbered with superstructures so that a selection of the type of holding medium can be made from the great variety of superstructures available. It is apparent that pivot pins 36, 37 may be removed by merely lifting them against the force of gravity to remove a base member or to replace a roller link. It is also apparent that great savings are encountered by the substitution of one superstructure for another superstructure, either due to wear, breakage or different type of superstructures.

Superstructures are attached to the base members as follows:

The toggle joint type of superstructure or tenter clip gate 50, illustrated in FIGURES l, 2 and 4, is placed upon base member 11 with seating pad 48 resting upon seats 15, A (FIGURE 3) and overlying pivot pin heads 36A, 37A and with aligning edge 47 abutting wall 14. Two screws 90 are passed through orifices located in horizontallly disposed bottom 51 to rotatively engage

screw threads

21, 22 and thereby hold down and attach tenter clip gate St to base member 10. It will be noted that the pull of the material on tenter clip gate 50 is in the direction of the arrow in FIGURE 4 and that wall 14 resists the stress of aligning edge 47 in the direction of the arrow. Screws 90 therefore are not subjected to stress in the direction of the arrow. Wall 14 may be made as sturdy as necessary to resist the pull force of the material. Screws 9!) do align superstructure 50 with base member 10 in a lateral direction or in a direction at right angles to the pull of the material as indicated by the arrow in FIGURE 4.

In like manner, the superstructure shown in FIGURES 7 and 8 is attached to base member 16 with seating pad 48A resting upon

seats

15, 15A and overlying pivot pin heads 36A, 37A and with aligning edge 47A abutting wall 14. Two screws pass through

orifices

95, 96 located in horizontally disposed bottom 51A to rotatively engage

screw threads

21, 22 and thereby hold down and attach tenter clip gate 50A to base member 10.

And in like manner pin clip 568 shown in FIGURE 9 is attached to base member 10 with seating pad 48C resting upon

seats

15, 15A and overlying pivot pin heads 36A, 37A, and with aligning edge 71 abutting wall 14. The screws such as screws 90 pass through

orifices

74, 75 to rotatively engage

screw threads

21, 22 and thereby hold down and attach pin clip 5538 to base member If It becames apparent that superstructure or tenter clip gate 50 or the superstructure shown in FIGURES 7 and 8 of the pin clip 568; all may be attached to base member 10A in the same manner in which the superstructures are attached to ibase member 10.

The

heads

36A, 37A of the pivot

ipins comprising shanks

36, 37, respectively, are described as being T- shaped. It is generally understood in the trade that T- shaped encompasses a lug head, a hexagonal shaped head, a knobby head or any structure which prevents the pivot pin from rotating in the vertical bore. Rotation of a pivot pin in a vertical bore causes undesirable wear on the pivot pin or bore which ever is constructed of the softer material.

Having shown and described preferred embodiments of the present invention, by way of example, it should be realized that structural changes could! be made and other examples given without departing from either the spirit or scope of this invention.

What I claim is:

1. A two piece tenter clip comprising a base member and a superstructure, said base member having a face, a bottom formed at an approximate right angle to said face, and an upper portion substantially parallel to said bottom, said upper portion having a step including a wall parallel to said face and a seating area, a groove located in said seating area, said superstructure comprising a material holding element having a seating pad and an aligning edge, said superstructure overlying said base member with said seating pad engaging said seating area above said groove, vertical bores located in said upper portion and said bottom, pivot pins provided with non-circular head located in said vertical bores, said heads located in and corresponding the to shape of said groove to prevent rotation of said pivot pins, said aligning edge engaging said wall to prevent relative movement of said superstructure with said base member in one direction, means removably securing said superstructure to said base member to prevent relative movement of said superstructure with said base member in a second direction at approximate right angles to said first direction, said last mentioned means preventing said superstructure from lifting away from said base member, and permitting various types of superstructure to be attached to said base member, roller links connected to said pivot pins, said base member enclosing and supporting said roller links.

2. A two piece tenter clip comprising a base member and a superstructure, said base member being of C-shaped section and consisting of a face, a bottom formed at an approximate right angle to said face and projecting rearwardly of said face, and an upper portion substantially parallel to said bottom, said upper portion having a step including a wall parallel to said face, a seating area, and a tail portion projecting from said seating area, a groove located in said seating area, vertical bores located in said upper portion and in said bottom, pivot pins, provided with non-circular heads, located in said vertical bores with said heads located in said groove, said groove having a shape corresponding to that of the heads to prevent pin rotation, roller links connected to said pivot pins, said base member enclosing and supporting said roller links, said superstructure comprising a material holding element having a seating pad and an aligning edge, said superstructure overlying said base member with said seating pad engaging said seating area and overlying said heads in said groove, said aligning edge engaging said wall to prevent relative movement of said superstructure with said base member in one direction, means removably securing said superstructure to said base member to prevent relative movement of said superstructure with said base member in a second direction at approximate right angles to said first direction, said last named means preventing said superstructure from lifting away from said base member, and permitting various types of superstructure to be utilized with said base member.

3. A two piece tenter clip comprising a base member and a superstructure, said base member being of C-sha-ped section and having a face, an integrally formed bottom at right angles to said face, and an upper portion parallel to said bottom and at right angles to said face, said upper portion having a step provided with a wall parallel to said face, a seating area and a tail portion projecting from said seating area, a groove located in said seating area, said groove providing a front edge and a rear edge, two vertical bores in said base member, two T-shaped pivot pins comprising heads and shanks, said shanks located, respectively, in said two vertical bores, solely under the influence of gravity, with said heads located in said groove between said rear edge and said front edge, whereby said heads do not rotate, roller links connected to said pivot pins, said C-shaped base member enclosing and supporting portions of said links connected to said pivot pins, said superstructure comprising a material holding element having a seating pad and an aligning edge, said superstructure overlying said base member with said seating pad engaging said seating area and overlying said heads, said aligning edge engaging said wall and screw means securing said superstructure to said base member, said wall preventing forward movement of said superstructure in relation to said base mem- 7 ber, said screw means preventing sidewise movement of said superstructure in relation to said base member, and permitting various types of superstructure to be utilized with said base member.

4. A two piece tenter clip comprising a base member and a superstructure, said base member being of C-shaped section and consisting of a face, a bottom formed at an approximate right angle to said face and projecting rearwardly of said face, and an upper portion attached to said face at a location substantially parallel to said bottom, said upper portion having a step including a wall parallel to said face, a seating area and a tail portion projecting from said seating area, a plurality of grooves located in said seating area, a plurality of vertical bores located in said upper portion and in said bottom, a plurality of pivot pins, provided with non-circular heads, located, respectively, in said plurality of vertical bores with said heads located in said plurality of grooves respectively, said grooves having a shape corresponding to that of the pivot pin heads, to prevent pin rotation, roller links pivotally mounted, respectively, to said pivot pins, said base member enclosing and supporting portions of said roller links, said superstructure having a horizontally disposed bottom provided with a vertically upstanding body, a clamping area, a pair of arms which project side- Wise from said body to overlie said superstructure bottom, a movable jaw, bearings in said pair of arms, a pintle mounted in said bearings, said jaw, provided with a gripping surface, hinged to said pintle to be normally free to move automatically into vertical relation with said clamping area, said horizontally disposed superstructure bottom having a seating pad and an aligning edge, said superstructure overlying said base member to form a two piece tenter clip, said seating pad engaging said seating area and overlying said heads in said plurality of grooves, said aligning edge engaging said wall to prevent relative movement of said superstructure with said base member in one direction, means removably securing said superstructure to said base member to prevent relative movement of said superstructure with said base member in a second direction at approximate right angles to said first direction, and said last named means preventing said superstructure from lifting away from said base member, whereby removal of the superstructure permits removal of said plurality of pivot pins.

5. A two piece tenter clip comprising a base member and a superstructure, said base member being of C- shaped section and consisting of a face, a bottom formed at an approximate right angle to said face and projecting rearwardly of said face, and an upper portion attached to said face at a location substantially parallel to said bottom, said upper portion having a step including a wall parallel to said face, a seating area and a tail portion projecting from said seating area, a groove located in said seating area, a plurality of vertical bores located in said upper portion and in said bottom, a plurality of pivot pins, provided with T-shaped heads, located, respectively, in said plurality of vertical bores with said T-shaped heads located in said groove, roller links pivotally mounted, respectively, to said pivot pins, said base member enclosing and supporting portions of said roller links, said superstructure having a horizontally disposed bottom, a vertically upstanding body provided with a cross arm, a pair of arms which project sidewise as a continuation of said upstanding body and forward of said cross arm to overlie said horizontally disposed superstructure bottom, -a movable jaw, hearings in said arms, a pintle mounted in said bearings, said jaw hinged to said pintle to be normally free to move into vertical relation with said horizontally disposed superstructure bottom under the action of gravity, an operating leg attached to said movable jaw, said horizontally disposed superstructure bottom having a seating pad and an aligning edge, said superstructure overlying said base member to form a two piece tenter clip, said seating pad engaging said seating area and overlying said T-shaped heads in said groove, said aligning edge engaging said wall to prevent relative movement of said superstructure with said base member in one direction, means removably securing said superstructure to said base member to prevent relative movement of said superstructure with said base member in a second direction at approximate right angles to said first direction, and said last named means preventing said superstructure from lifting away from said base member, whereby removal of superstructure permits removal of said plurality of pivot pins.

6. A two piece tenter clip as claimed in claim 5 wherein a coil spring is located between said cross arm and said movable jaw and assists the forces of gravity to move said jaw into vertical relation with said horizontally disposed superstructure bottom.

7. A two piece tenter clip comprising a base member and a superstructure, said base member being of C- shaped section and consisting of a face, a bottom formed at an approximate right angle to said face and projecting rearwardly of said face, and an upper portion attached to said face at a location substantially parallel to said bottom, said upper portion having a step including a wall parallel to said face, a seating area and a tail portion projecting from said seating area, a groove located in said seating area, a plurality of vertical bores located in said upper portion and in said bottom, a plurality of pivot pins, provided with non-circular shaped heads, said heads corresponding to the shape of the groove located, respectively, in said plurality of vertical bores with said non-circular T-shaped heads located in said groove, whereby said head-s do not rotate, roller links connected to said pivot pins, said C-shaped base member enclosing and supporting portions of said roller links connected to said pivot pins, said superstructure comprising a pin clip provided with a seating pad and an aligning edge, said superstructure overlying said base member with said seating pad engaging said seating area and overlying said heads in said groove, said aligning edge engaging said wall to prevent relative movement of said superstructure with said base member in one direction, means removably securing said superstructure to said base member to prevent relative movement of said superstructure with said base member in a second direction at approximate right angles to said first direction, and said last named means preventing said superstructure from lifting away from said base member, and permitting various types of superstructure to be utilized with said base member.

8. A two piece tenter clip comprising a "base member and a superstructure, said base member being of C-shaped section and having a face, a bottom formed at an approximate right angle to said face and projecting rearwardly of said face, and an upper portion parallel to said bottom and at an approximate right angle to said face and provided with a seating area, said superstructure comprising a material holding element having a seating pad, said superstructure overlying said base member with said seating pad engaging said seating area, and means between said base member and superstructure providing an aligning edge to prevent relative movement between said base member and superstructure in one direction, two vertical bores in said base member, two pivot pins located in said two vertical bores, respectively, and held in said bores under the influence of gravity, and means to prevent said two pivot pins from rotating in said two vertical bores, said superstructure overlying said two pivot pins, a second means removably securing said superstructure to said base member, said last mentioned means permitting various types of superstructure to be attached to said base member and roller links having portions thereof connected to said pivot pins and enclosed and supported within said C-shaped section.

(References on following page) UNITED References Cited by the Examiner STATES PATENTS Doubleday 74-251 Smith et a1 74-251 X Holt 74-251 X Nash 2662 10 3,118,212 1/1964 Parkinson 26-61 3,180,002 4/1965 Nash 26-62 FOREIGN PATENTS 1,652 1884 Great Britain 74251 ROBERT R. MACKEY, Acting Primary Examiner.

DONALD W. PARKER, Examiner.

Claims

1. A TWO PIECE TENTER CLIP COMPRISING A BASE MEMBER AND A SUPERSTRUCTURE, SAID BASE MEMBER HAVING A FACE, A BOTTOM FORMED AT AN APPROXIMATE RIGHT ANGLE TO SAID FACE, AND AN UPPER PORTION SUBSTANTIALLY PARALLEL TO SAID BOTTOM, SAID UPPER PORTION HAVING A STEP INCLUDING A WALL PARALLEL TO SAID FACE AND A SEATING AREA, A GROOVE LOCATED IN SAID SEATING AREA, SAID SUPERSTRUCTURE COMPRISING A MATERIAL HOLDING ELEMENT HAVING A SEATING PAD AND AN ALIGNING EDGE, SAID SUPERSTRUCTURE OVERLYING SAID BASE MEMBER WITH SAID SEATING PAD ENGAGING SAID SEATING AREA ABOVE SAID GROOVE, VERTICAL BORES LOCATED IN SAID UPPER PORTION AND SAID BOTTOM, PIVOT PINS PROVIDED WITH NON-CIRCULAR HEADS LOCATED IN SAID VERTICAL BORES, SAID HEADS LOCATED IN AND CORRESPONDING TO THE SHAPE OF SAID GROOVE TO PREVENT ROTATION OF SAID PIVOT PINS, SAID ALIGNING EDGE ENGAGING SAID WALL TO PREVENT RELATIVE MOVEMENT OF SAID SUPERSTRUCTURE WITH SAID BASE MEMBER IN ONE DIRECTION, MEANS REMOVABLY SECURING SAID SUPERSTRUCTURE TO SAID BASE MEMBER TO PREVENT RELATIVE MOVEMENT OF SAID SUPERSTRUCTURE WITH SAID BASE MEMBER IN A SECOND DIRECTION AT APPROXIMATE RIGHT ANGLES TO SAID FIRST DIRECTION, SAID LAST MENTIONED MEANS PREVENTING SAID SUPERSTRUCTURE FROM LIFTING AWAY FROM SAID BASE MEMBER, AND PERMITTING VARIOUS TYPES OF SUPERSTRUCTURE TO BE ATTACHED TO SAID BASE MEMBER, ROLLER LINKS CONNECTED TO SAID PIVOT PINS, SAID BASE MEMBER ENCLOSING AND SUPPORTING SAID ROLLER LINKS.