US2221859A

US2221859A - Shoe clamp

Info

Publication number: US2221859A
Application number: US260572A
Authority: US
Inventors: Francis L Brandt
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1939-03-08
Filing date: 1939-03-08
Publication date: 1940-11-19
Anticipated expiration: 1957-11-19

Description

N0V- 19, l940 F. L. BRANDT 2,221,859

SHOE CLAMP Filed March a, 1939 l Flgz /z8 d3? al Patented Nov. 19, 1940 UNH''E STATES i?? ESE PATENT s SHOE CLAMP Jersey Application March 8,

9 Claims.

My invention relates to devices by which portions of shoes may be clamped temporarily in engagement with each other. Herein, the invention is disclosed as applied to the holding in place 5 of a heel upon the heel-seat of a shoey for its attachment, as by an interposed adhesive.

in clamping devices, and especially those in which the applied pressure is held by the engagement of a detent with a series of teeth, such engagement is liable to so occur, as at a point between successive teeth of the series, that there may be some retraction of the clamping means caused by'the lost motion resulting from the length or the tooth-spaces. The pressure is thereby diminished. An object of the invention is to insure the holding of at least the full clamping pressure upon the work.

To attain the above object, I combine in a novel manner with a clamping member movable upon a frame to apply pressure to a shoe-portion, a retaining member movable into engagement with the pressure member, and thereafter in the direction of the pressure movement in engagement with said pressure member. This lastmentioned movement may be eective, not only to carry such a retaining member as a detent in against one of the series of teeth upon a clamping member between which it has entered, but may also increase the pressure exerted by the clamping member. Herein, the clamping member is disclosed as in the form of a plunger provided with a series of teeth, while the retaining member is a detent arranged for actuation by a lever, preferably in theV form of a toggle with one 'arm arranged for movement by the operator and fulcrumed upon the frame of the device, and a second arm pivoted to the first and to the detent. This lever may produce three successive positions of the detent, as for plunger-retaining, pressureperfecting and plunger-releasing.V

One of the several possible embodiments of the invention is illustrated in the accompanying drawing, in which Fig. 1 shows my improved clamp, partly in side elevation and partly in section, the elements being positioned ready for action upon the work, with the plunger freed from the retaining member;

In Fig. 2 the elements appearcorrespondingly in front elevation;

Fig. 3 is a vertical section taken from front to rear of the clamp, with the plunger depressed into preliminary engagement with the jacked work; and

Fig. 4, a like View with the elements in their nal positions for the application of full pressure.

There appears in the drawing, portions of a frame, including the top of a stand or jack I and an overhanging arm I2. Rising from the top of the jack is a last-pin I4. Guided for vertical 1939, Serial N0.' 260,572

reciprocation in the end of the frame-arm above the jack is a plunger I8, having at its lower extremity ahead or enlargement 2t, which may be toothed or roughened at 22 to give more secure engagement with the jacked work. This work is shown in Fig. 3 as consisting of a shoe S carried upon a last L, a passage l in which is applied to the pin I of the jack, and a heel I-I, with its cup resting upon the heel-seat of the shoe, to receive on its tread-surface contact of the end 22 of the plunger-head. The plunger is held normally raised, to the extent permitted by the engagement of the upper edge of its head with a shock-absorbing cushion 24, by a spring 26 surrounding the plunger between a hand-pad 23 upon its upper end and the top of the frame-arm. The'outer side of the cylindrical shank of the plunger is flattened to give a surface 32, upon which is formed a series of teeth 3Q. Each tooth has a horizontal surface :c joined by a downwardly and inwardly inclined surface y to the next tooth below it. With these teeth co-operates a plungerretaining detent furnished by a tooth 36, provided with surfaces :r and y co-mplemental to those of the teeth 34 and projecting from a bodyportion 38 opposite the surface 32 and its teeth. The detent-body is pivoted at t@ between the spaced sides of one arm 42 of a toggle-lever, the

other arm 44 of which is fulcrumed at it upon spaced extensions t8 from the frame-arm i2 and is pivoted at 50 between the sidesof the arm 42. The toggle-arm 44 is in the form of a hand-lever, having an outward and upward extension 52, arranged to be grasped conveniently by the operator, and an inner portion t to which the arm l2 is pivoted. A tension-spring 55 joins the upper edge of the detent-body 38 to the frame-arm i2 between the inner toothed face and the pivot 4S. This spring, together with the weight of the leverarm 52, holds the toggle-lever and the detentbody in their normal positions. The body is urged toward the surface 32 of the plunger, so its tooth 36 is ready to engage and retain any one of the plunger-teeth 35i. The spring also has the effect of holding the detent-body yield-ably about its pivot 40, this movement under the influence of the spring being limited by contact of the body with the arm 42. Therefore, as the plunger I8 is forced down, the teeth 34 will swing the detent outwardly by engagement of the opposed inclined surfaces y. Upward movement of the depressed plunger by the spring '25 will beprevented by contact between the horizontal surfaces .r upon any one of the teeth 34 and thev detent. 'This is as appears in Figs. 3 and 4. When the handlever is raised by the operator to the position shown in Fig. 1, to an extent permitted by the striking of a surface 58 upon theV lever-portion 5t against a stop-pin 6B bridging the space between the arm-extensions 48, the lever-arms ft2 and 44 remain in the same relation to each other because of contact between

surfaces

62 and 64 upon the respective arms. This causes the detent 36 to be carried away from the teeth 34, as the 5 pivotal connection f is shifted outwardly, re-

leasing the plunger and allowing it to be raised by its spring 25. At the same time, the

contacting surfaces

62, 64 prevent the spring 56 from displacing the lever-arm 42 and the detent-body 38 upwardly out of the proper relation to the teeth 34 for the succeeding engagement. After the initial operating movement of the plunger to the position of Fig. 3, the hand-lever may be depressed, as is illustrated in Fig. 4, until a surface 55 upon the lever-portion 54 strikes the stop-pin 5). The toggle is thereby straightened, the surfaces 52 and G4 separating. This action of the toggle carries the pivot 40 downwardly and in- Wardly and with it the detent. There is thus produced su'icient travel of the detent in the space which it occupies between two adjacent teeth 34, to insure either full engagement between the two opposed horizontal surfaces x, if these are considerably separated, or will further depress the plunger, if the separation is relatively slight. In either case, all the pressure applied to the work by the depression of the plunger will be held without being diminished by retraction through some portion of a tooth-space.

In using the clamp for the attachment of heels, with the plunger I8 raised by the spring 26, as shown in Fig. l, and with the hand-lever 52 free, as in Fig. 3, ready for retention of the teeth 34 by the detent 36, the operator jacks a shoe S and places a heel H upon its heel-seat, with an interposed adhesive. By pressure upon the handpad 28, the surface 22 of the plunger is urged against the tread-end of the heel to clamp said heel rmly in position while the adhesive sets. -10 As the plunger is lowered and its teeth pass over the detent, the latter is successively forced out by the passage of the inclined surfaces y, the spring 55 yielding. When the plunger has reached its lowest position for the force applied 45 to the pad, the horizontal surfaces at of the detent and of the plunger-tooth below it will contact to hold the plunger against all retraction, save that introduced by the spacing of the teeth 34.

But this is compensated for through depression 50 of the hand-lever 52 by the operator (Fig. 4).

This straightens the

toggle

42, 44 to carry the detent bodily in and down to take up the lost motion and give all of, or more than, the pressure upon the work resulting from the initial 55 depression of the plunger. The detent is also locked by the straightened toggle in its plungerretaining position. After an interval sufficient for the setting of the adhesive, the hand-lever is thrown up by the operator to the position of to Fig. 1, withdrawing the detent from the plungerteeth and allowing the plunger to be elevated by its spring 25. The finished work may thereupon be removed from the jack.

Having described my invention, what I claim o5 as new and desire to secure by Letters Patent of the United States is:

1. In a shoe clamp, a frame provided with an overhanging arm, a shoe-supporting jack rising from the frame beneath the arm, a plunger guided 70 for vertical reciprocation at the end of the framearm, a lever fulcrumed at the end of said framearm outside the plunger, and a retaining member movable by the lever into engagement with the plunger and thereafter downwardly toward the jack.

2. In a shoe clamp, a frame, a clamping member movable in the frame to apply pressure to a shoe-portion supported upon the frame, said member being provided with a series of teeth, a detent bodily movable into engagement with the teeth, a hand-lever fulcrumecl upon the frame and pivotally connected to the detent, and a spring joining the detent to the frame and by which said detent is normally withdrawn from the teeth of the clamping member.

3. In a shoe clamp, a clamping member provided with a series of teeth and movable to apply pressure to a shoe-portion, a detent bodily movable into engagement with the teeth, a lever pivotally connected to the detent, and a spring connected to the detent and exerting its force to withdraw it from the teeth and to hold the lever in its normal position.

4. In a shoe clamp, a frame, a clamping member movable in the frame to apply pressure to a shoe-portion supported upon the frame, said member being provided with a series of teeth, a detent movable into engagement with the teeth, and a toggle-lever having an arm fulcrumed upon the frame and provided with an extension furnishing a hand-lever, and a second arm pivoted to the irst toggle-arm and to the detent.

5. In a shoe clamp, a frame, a clamping member movable in the frame to apply pressure to a shoe-portion supported upon the frame, said member being provided with a series of teeth, a detent bodily movable into engagement with the teeth, and a toggle-lever having an arm pivoted to the detent, said toggle-lever when straightened advancing the clamping member in the direction of clamping movement.

6. In a shoe clamp, a frame, a plunger movable therein for engagement with a shoe-portion, a member for retaining the plunger in engagement with the work, a toggle-lever having an arm pivoted upon the frame and an arm pivoted to said arm and to the retaining member, and a spring exerting its force to break the toggle-lever.

'7. In a shoe clamp, a frame, a plunger movable therein for engagement with a shoe-portion, a member for retaining the plunger in engagement with the work, a toggle-lever having an arm pivoted upon the frame and an arm pivoted to said arm and to the retaining member, and a spring joining the retaining member to the frame.

8. In a shoe clamp, a clamping member provided with a series of teeth and movable to apply pressure to a shoe-portion, a detent movable .into engagement with the teeth, a toggle-lever, the arms of said toggle-lever having opposed surfaces and upon one of which arms the detent is pivoted, and a spring connected to the detent and acting to maintain the arm-surfaces normally in contact with each other.

9. In a heel-attaching device, a jack, a plunger provided with a longitudinal series of teeth and depressible into engagement with a heel upon a jacked shoe, a movable detent for engagement with the teeth, and a toggle-lever for moving the detent, said lever being movable to three successive positions, one in which the detent 4engages the teeth and a second in which it moves longitudinally of the series with the toggle broken, and a third in which it is disengaged from the teeth when the toggle is straightened.

FRANCIS L. BRANDT.