US1281000A - Cam-lever. - Google Patents

Description

W. H. HAYTER CAM LEVER.

APPLICATiON FILED MAY 13. I918.

Patented Oct. 8, 1918..

2 SHEETSSHEET I.

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y-wmmtew W. H. HAYTER.

CAM LEVER.

APPLICATIONFILED MAYl3,l918.

Patented Oct. 8, 1918.

2 SHEETS-SHEET 2.

By. 5. F 6.

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TED STATES PATENT OFFICE.

"WILLIAM HARRY HAYTER, or SOUTH nonwoon, LONDON, ENGLAND.

CAM-LEVER.

Specification of Letters l a tent.

Patented Oct. s', 1918.

Application filed m 13, 1918. Serial No. 234,147.

To all whom it may concern:

Be it kI10WIl 'tl12lt I, VILLIAM HARRY IIAYTER, subject of George V, Kin of Great Britain andIreland, and residing at '27 Birchanger road, South Nor-wood, in the county of London, England, have invented certain new and useful Improvements in Cam-Levers, of which the following is a specification.

This application is a continuation in part of application Serial No. 145,810, filed February th, 1917. ',This invention relates to improvements in and connected with levers having a camstructed in accordance with this invention.

'Fig. 2 illustrates how the lever maybe employed in fastening members together, a portion of,the'lever-support and a portion of one of the members having been broken away in order to more clearly illustrate how the lever operates.

Figs. 3 and 4 are fragmentary views illustrative of-t'wo further methods of using the lever.

Figs. 5 and 6 show modifications of the lever in respect of its slot.

Fig. 7 shows in side elevation a form of multiple lever constructed in accordance with this invention.

Fig. shows a further modification of the lever.

Like letters of reference refer to like parts throughout the drawings.

Referring to the drawings, A IS the lever which is mounted, by means of a slot (4 therein, on a pivot b in a slot 0 formed 1n one end of a pin'or support 0' (hereinafter termed the tie) the other end of Wl11Cl1 1s grovided with ahead 0 Fig. 2. The pivot.

is a fixture. The longer arm of the lever is forces the member 6 home.

of accommodating one of the operators finers, and is also provided with a heel a The shorter arm of the lever is in the form of a toe at The slot 0 is of such a depth as to allow the lever tt) be swung over on its pivot. Dealing now withth'e method, illustrated in Fig. 2, of fastening the three members at,

c, 'f, together, the members. d and c are provided witl1 holes d and 6 respectively, through whlclrthe tie c, with the lever in the position shown in broken lines in Fig.

then swung down so that its longer arm lies flat against the member 6, as shown in full lines. the longer arm, the heel a engages one side of the hole c thereby causing the lever to move from right to left; as seen in the figure,

and the toe a to ride upon the opposite side of the hole. During this forcing or snapping home of the leverthe members become drawn tightly together. It' will be seen that when the lever is at rest its arms press upon the member 6 at two pointsone on each sideof the pivot b. The pressure at lthese two points is transmitted direct to he pivot and, as these pressures oppose or, as may be arranged, balance one another, the lever is caused to automatically maintain or look itself in position and is prevented from accidentally rising and permitting the members to separate.

In order to cause the lever to snap tightly against the member e, it is preferable to so fashion that portion of the surface of the heel that is remote from the toe that it meets During the downward movementof '2, is passed up to its head '0 The lever is the flat under surface of the lever at or about a right angle, so that just prior to the lever completing its movement toward the member the heel sinks suddenly into the pin a and the long arm of the lever snaps with a rapid movement against the member e. In

order to release the lever an outward pull must be applied to its longer arm.

Referring to Fig. 3, the heel a 'and toe a bear on the bottom of the slot 0 and on the member 6 respectively, while in Fig. 4 the heel and toe bear on the member 6 and bottom of the slot 0 respectively. In both cases the downward movement of the lever It will be "obvious that instead of utilizing the bottom in. the form of a handle, preferably pro.- of the slot 0,.for the heel in the one case vided with a depression a for the purpose or the toe in the other case, to work against,

till

any other suitable form of abutment or surface which is stationary relatively to the tie 0 may be employed for the same purpose.

When the lever is in the position shown in broken lines in Fig. 2, the member 6 can be given a preliminary push home by Swinging the lever to the left and pressing its arcuate portion (1, (lying opposite the portion extending from the heel a to the toe (t upon the adjacent edge portion of the hole 6.

The slot a may be arranged at an inclination, as illustrated in Fig. 5, and it may be open-ended, as illustrated in Fig. 6.

In some cases, according to this invention, the pivot is fixed in the lever and works in a slot provided in the tie 0. If this slot is horizontal or approximately so it may be open-ended so that the pivot can be readily introduced intoit.

If a single throw of the lever is found to be insutlicient to produce the required pressure, 6. 9., when compressing a bale of soft goods, increased pressure can be obtained in stages by swinging the lever up into the position shown in broken lines in F ig. 2,

- threading a washer or washers over it, and

,then bringing it down again so that the heel and toe of the lever act upon the washer or washers instead of upon the member e, until the required pressure is obtained.

An alternative method of obtaining in creased pressure is to employ what I may term a multiple lever, that is, two or more levers constructed as above described but each having a different throw and mounted on a single pivot. An example of such'an arrangement is illustrated in Fig. 7. figure shows what may be termed a triple lever, 27. 6., three levers mounted on a single pivot. The broken lines show the levers in non-operative position, 'WllllG the full lines.

show them in the position they occupy after they have been forced down into contact with the pressure-member. In using these levers they are turned down in the order of their throw commencing with the lever having the least throw; that is, lever No. l is first turned down. then lever No, 2, and finally lever No. 3. The lever to be last turned down may be provided with a catch (15 or other device adapted to engage the levers previously turned down so as to fasten the several levers together.

The surfaces against which the heel and toe of the lever operate instead of being plane, as illustrated, may be rounded In some cases, as some sort of a safeguard against unauthorized opening of the lever, the long arm of the latter is shortened back to about the length of the short arm, as illustrated in Fig. 8, and'is provided with a hole a to receive a removable pin (not shown) This resztooo by inserting this pin intothe hole a and pulling it upward the lever can be opened.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

LA cam-lever adapted to be pivotally mounted in a slotted element so as to bear with the heel and toe of its cam face on an additional element on opposite sides of said slotted element, said cam-lever being provided with a slot to receive the pivot pin and allow longitudinal movement of said lever thereon, and said slot being disposed at an angle to the cam face, in order that the cam face may act on said additional element on,

one side of said slotted element to force the lever longitudinally on said pivot pin until the cam face engages said additional element on the other side of said slotted element.

2. A cam-lever adapted to be mounted for longitudinal and pivotal movement in a slotted element so as to bear, in normal position, with the heel and toe of its cam face on an additional element on opposite sidesof said slotted element in order that the cam face may act on said additional element to force the lever longitudinally until the cam face engages said additional element on two sides of said slotted element.

3. A cam-lever adapted tobe mounted for longitudinal and pivotal movement in a slotted element so as to bear, in normal position, with the heel and toe of its cam face on relatively substantially fixed surfaces on opposite sides of itspivotal point in normal position, a portion of said cam face in operation engaging one of said fixed surfaces on one side of the pivotal point and forcing the cam-lever as a whole longitudinally until another portion of said cam fa-ce engages the other of said fixed surfaces on the other side of said pivotal point.

l. A plu ality'of cam levers all mounted on a common pivot pin and adapted to be arranged in a slotted element sothat each lever may bear in sequence on an additional element adjacent to said slotted element and so that the respective cam faces may engage relatively substantially fixed surfaces on opposite sides of their pivotal points, said cam levers being provided with slots to receive thepivot pin and allow longitudinal movement of said levers thereon, and said slots being disposed at an angle to the respective cam faces, the curvatures of said cam faces differing successively in order that the desired pressure may be easily obtained by forcing said'cam levers into normal position. in regular order.

In witness I have hereunto set my hand.

WILLIAM HARRY HAYTER.

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