US845640A

US845640A - Hollow work-support or bed.

Info

Publication number: US845640A
Application number: US26377405A
Authority: US
Inventors: Henry A Holder
Original assignee: Individual
Current assignee: Individual
Priority date: 1905-06-05
Filing date: 1905-06-05
Publication date: 1907-02-26
Anticipated expiration: 1924-02-26

Description

PATENTED P313526, 190?.

H. A. HOLDER. HOLLOW WORK SUPPORT 0R BED.

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PATENTED 213.26 1907.

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No.845,640. 'PATENTED FEB. 26, 1907. H. A. HOLDER.

HOLLOW WORK SUPPORT OR BED. APPLIOATION FILED JUNE 5, 1905.

- 4 SHEETS-SHEET UNITED STATES PATENT OFFICE.

HENRY A. HOLDER, LYNN, MASSACHUSETTS.

.HOLLOW WORK-SUPPORT QR BED.

To all whom it may concern.-

Be it known that I, HENRY A. HOLDER, a citizen of the United States, residing in Lynn, in the county of Essex and State of Massachusetts, have invented an Improvement in Hollow Work-Supports or Beds, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

This invention relates to a fluid-tight receptacle provided with a movable portion or member, preferably of a substantially non-extensible materialsuch, for instance, as canvas, duck, or like materialand has for its object to provide for bodily movement of said portion or member, whereby a maximum cushioning effect of a fluid backing for said movable member may be obtained without stretchin straining, or otherwise injuring the movable member.

The invention is especially adapted to be embodied in a fluid-tight receptacle employed in a machine for treating hides, skins,

',' or leather as the bed or support for the work while the latter is undergoing treatment by a bladed cylinder or other operatingtool.

In the present instance the invention is shown as embodied in a machine for fieshing or unhairing hides and skins, and provision is made for taking up any slack or irregularities in the fit of the movable portion or member of the bed or work-support and also for taking up any possible stretch in the material of which the movable member is composed which might possibly take place in-case the movable member should be worn down or become thinner in use.

The movable member of the bed may have cooperating with it a removable covering constituting the active working face thereof, and provision is made for securing said covering so that it can be quickly and easily renewed when so desired and so that any stretch in said covering may be taken up. The movable member or portion of the bed or work-support may have cooperating with it a fluid-tight tube, by means of which the necessity of making a fluid-tight connection between the movable member and the stationary member or structure to which it is secured is avoided.

These and other features of this invention will be pointed out in the claims at the end of this specification.

Figure 1 is a vertical section of a machine Patented Feb. 26, 1907.

I provided with a bed embodying this invenl tion; Fig. 2, a side elevation, on an enlarged l scale, of the bed shown in Fig. 1; Fig. 3, a cross-section, on an enlarged scale, of the bed shown in Fig. 1; Fig. 4, a front elevation, and Fig. 5 a plan, of the bed shown in Fig. 2 and Figs. 6 and 7, details to be referred to.

in the present instance I have shown one form or construction of bed or work-support embodying this invention which consists,

essentially, of a stationaryportion or member and a movable portion or member.

The stationary portion or member, as herein shown, comprises a bottom wall a, an upwardly-extended wall I), and end walls 0, (see Fig. 3,) all of which parts may be made i of metal and cast in one piece. Between the front edge of the bottom wall a and the front edge of the upwardly-extended wall I) is an opening which extends substantially the length of the bed and is closed by the movable portion or member d, which latter may and preferably will be made of substantially nonextensible materialsuch as canvas, duck, or like materialwhich is firmly secured to the stationary portion of the bed. The movable member d may be detachably secured to the stationary portion or member of the bed by means of clamping devices, herein shown as bars e f, cooperating, respectively, with the front face of the bottom a of the stationary member and with the upper surface of the upright wall b and secured thereto by the screws h i. The movable member d of the bed is also secured at its ends to the end walls 0 of the stationary member of the bed, and in order to permit the substantially nonextensible movable member d to obtain the full cushioning effect of a fluid backing and to be moved inwardly without subjecting it to strain or otherwise injuring the same the ends of the said movable member are fastened to the end walls 0 of the bed out of line 'with the normal working position of the movable member of the bed. For this purpose the end walls a of the bed are made smaller than the cross-sectional area of the bed in its working position and may be provi ded, as herein shown, with inwardly-curved or reentrant surfaces or edges j, (shown best in Figs. 2 and 3,) to which the ends of the movable member d are firmly secured, as by the clamping-bars k, which are fastened to said end walls by the screws m and which may be attached to the clamp e.

In order to take up slack or any irregularities in 'the fit of the movable member 01, means, shown as adjusting screws or rods n. are provided, which are extended through slots or openings in a flange or web p on the stationary member of the bed (see Figs. 3 and and are fastened to the movable member d of the bed at points intermediate its ends, which may be accomplished, as herein shown, by clamping jaws or devices 10 12, between which the movable member (1 is secured by means of the screw or bolt 13. The adjusting screws or rods n are provided with nuts 14, by turning which the movable member d maybe drawn over the edge of the upright portion 1) of the bed, the clamp f being first released, and after any slack which may exist has been taken up the clamp f is secured in its operative position to firmly fasten the movable member d to the station ary member of the bed.

The movable portion or member (Z may have cooperating with it a removable cover ing 16, which may be of substantially thin flexible leather, which constitutes the active working surface of the movable member of the bed and which may be removably secured in place by the clamps ef, the lower end or edge of the covering being preferably folded or passed about a rod 18 to better secure it in place.

The movable member (1 cooperates with the rigid or stationary member of the bed to form a hollow bed into which fluid-pressure is admitted, which pressure may be air, water, or other gas or liquid. In order to avoid the necessity of making fluid-tight joints between the movable member d and the stationary portion of the bed, it is preferred to use an inner tube 20, of rubber or like flexible material, which is placed within the hollow bed or support.

In the present instance the inner tube 20 is shown as secured by the wire coil 21 to a nipple 22, which extends through an opening 23 in the bottom a of the stationary member or portion of the bed and is secured therein by the set-screw 24. The nipple 22, as shown in Fig. 1, .is connected by the cou ling 25 with a hose or pipe 26, which leads to a reservoir or pressure-tank 27, provided, as herein shown, with a pressure-gage 28 and with an automatically-operated relief or safety valve 29. The pressure-tank 27 is provided with an inlet-pipe 30, which is connected to a suit able pump or compressor 31 of any suitable construction, which is designed to be con tinuously driven by the belt 32 while the machine to which the bed is applied is in use. The pressure-tank 27 may be provided with a manually-operated stop-cock or valve 33.

The machine to which the bed or worksupport is applied may be of any suitable or desired construction and in the present instance is shown as a machine comprising a rolls 36 37 38, substantially such as shown and described in United States Patent No. 696,588, dated April 1, 1902, to which reference may be had for a more detailed explanation of the operation of the machine herein shown, inasmuch as the present invention relates more particularly to the bed or worksupport above described. In. the patent referred to the roll 36 constitutes the bed-roll, whereas in the present instance its function is that of a feed-roll. The bed or work-support cooperates with the bladed cylinder or roll and is moved toward and from the same, and for this purpose is attached, as by the screws 39, to the carrier 40 for the feedrolls. This attachment is best shown in Figs. 1 and 6.

In operation the hollow bed has admitted into it fluid-pressure, which forces the movable member of the bed into its outward or working position. (Shown in Figs. 1 and 3.) The Iluid pressure may be varied according to the character of the work to be performed, being greater when the machine is used for fieshing than when used for unhairing hides and skins. The fluid-pressure is adjusted so that the movable member occupies the position shown by full lines in Figs. 1 and 3 when the thinner portions of the hide or skin or leather are presented in proper working 5 relation to the tool or bladed cylinder 35. When a thicker portion of the work is interposed between the operating-tool and the movable member of the bed, the latter is free to be forced or moved inwardly against the fluid-pressure, thereby obtaining the full beneiit of the fluid-cushion without subjecting the material of which the movable member is composed to strain. This inward movement is ermitted by the crimped ends of the movable member, for it will readily be seen that the portion of the movable member intermediate its ends may be moved bodily inwardly until said intermediate portion of the movable member is carried into and be yond the plane in which the ends of the said member are located.

In the construction herein represented the intermediate portion of the movable member of the bed can be forced inwardly until it occupies a position indicated by the curved dotted lines (I in Fig. 3 without subjecting the said member to strain. By securing the ends of the movable member back of the normal or working position of said member the latter is permitted to respond to an increase in the thickness of the work and be moved back or inward without resistance by the nonextensible material, consequently avoiding stretching, straining, or otherwise injuring the movable member, while proper alinement of the movable member with relation to the working tool is maintained, and the full cushioning effect of the internal pressure on the movable member is obtained.

In the apparatus herein shown the excessive fluid-pressure Within the bed or worksupport caused by excessive external pressure on the movable work-support due to increased thickness of the work is avoided by the relief-valve 2-9, and said internal pressure is reestablished at a predetermined point or amount by the pressure in the reservoir but this feature is not herein claimed, broadly, as it forms the subject-matter of another application, Serial No. 227,102, filed October 4, 1904.

The invention is herein shown as embodied in one form of work-support or bed 3 but it is not desired to limit the invention in this re spect.

I claim 1. In an apparatus of the character described, in combination, a hollow bed or work-support comprising a stationary member provided with an opening, a movable member covering said opening and having its ends secured to said stationary member back of or within the normal working position of said movable member, a removable covering or face for said movable member, means to detachably secure said movable member and its covering to said stationary member, and means to adjust said movable member to said stationary member, substantially as described.

2. In an apparatus of the character described, in combination, a hollow bed or work-support comprising a stationary member provided with an opening, a movable member covering said opening and having its ends secured to said stationary member back of or within the normal working position of said movable member, and a fluid containing tube within said hollow bed and cooperating with said movable member, a source of fluid-supply, and means to connect said inner tube with said source of fluid-supply, substantially as described.

3. In an apparatus of the character described, in combination, a hollow bed or work-support comprising a stationary member provided wth an opening, a movable member covering said opening and having its ends secured to said stationary member back of or within the normal working position of said movable member, means to detachably secure said movable member to said stationary member, and means to adjust said movable member to said stationary member, substantially as described.

4. A hollow bed or work-support comprising a stationary member, and a movable member of substantially non-extensible material, and means to secure the ends of said movable member out of line with the normal working position of said movable member, to enable said member to be moved from its working position, substantially as described.

5. A hollow bed or work-support provided with a movable member of substantially nonextensible material having its ends secured out of line with its intermediate portion to permit bodily movement of said intermediate portion, for the purpose specified.

6. A hollow bed or work-support provided with end walls having reentrant portions, and a movable member having its ends secured to said reentrant portions, and means to force the intermediate portion of said movable member outward beyond said reentrant portions of the end walls, substantially as described.

7. A hollow bed or work-support provided with a movable member having its ends out of line with its intermediate portion to permit bodily movement of said intermediate portion, and a fluid-containing tube within said hollow bed or work-support cooperating with said movable member to force its intermediate portion beyond the plane of the end portions of said movable member, and to permit said intermediate portion to yield under external pressure, substantially as described.

8. A hollow receptacle provided with a movable member having its ends fastened out of line with its intermediate portion, and a fluid medium under pressure within said hollow receptacle normally forcing said intermediate portion-beyond and out of line with its ends and permitting bodily movement of said intermediate portion under external pressure, substantially as described.

9. A hollow bed or worlcsupport comprising a stationary member, and a movable member of substantially non-extensible material, and means to adjust the movable member intermediate its ends to said stationary member, substantially as described.

1 0, A hollow bed or work-support comprising a stationary member, a movable member fastened at its ends to said stationary member, and means cooperating with the movable member intermediate its ends to adjust said movable member to said stationary member, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HENRY A. HOLDER.

Witnesses:

JAS. H. CHURCHILL, J. MURPHY.