US2269579A - Window and blind arrangement - Google Patents

Description

Jan. 13, 1942.

A. H. CHILTON WINDOW vAND BLIND ARRANGEMENT Filed May 24, 1938 4 Sheets-Sheet l Jan. 13 1942.

, A. H. CHILTON 2,269,579

WINDOW AND BLIND ARRANGEMENT I Filed May l24, 1938 4 Sheets-Sheetl 2 4 Sheets-Sheet 3 `A. H. CHILTON wINDow AND BLIND AHRANGEMENT Filed May 24, 1958 Jan. 13, 1942.

Jan. 13,1942. A, H CmLTON 2,269,579

wINDow AND BLIND ARRANGEMENT l Filed May 24, 1938 4 sheds-sheet 4 ,aren/aff',

www VW Patented Jan. 13, 1942 2,269,579 WINDOW AND BLIND ARRANGEMENT Alfred Henry Chilton, London, England, assignor,

by mesne assignments, to The Safety Car Heating & Lighting Company, Inc., New York, N. Y., a corporation of Delaware Application May 24, 193s, serial No. 209,825 In Great Britain May 28, 1937 18 Claims. (Cl. 189-64) This invention concerns improvementsV relating to windows and window blinds, screens or shutters (hereinafter termed blinds) and has'for its principal object to provide an effective arrangement for use in cases where it is desired to limit the penetration through the window of thermal radiation.

An example of a case where the effective solution of this problem is of especial importance is that of railway coaches provided with air-cooling equipment for use in hot climates. tical reasons, there are limits to the capacity of the cooling equipment and it is therefore essential that the leakage of heat into the coach should be reduced to a minimum. Thermal insulation of the body of the coach leaves the windows as vulnerable points by which considerable heat can enter.

The use of double windows cuts down the entry cf heat to some extent and better results can be obtained by the use of external shutters in conjunction with such double windows. In practice, however, there are various objections to the latter arrangement, particularly on railway coaches. For example, it would be dilricult to make satisfactory provision for adjustment 'of the shutters. Also it would be difficult to keep the window-arrangement clean and in good order.

The last-named objection applies also to arrangements, as proposed heretofore, in which a blind is provided between the panes of a double window. Particularly in the case of railway coaches which are exposed for unlimited periods not only to every kind of adverse weathercondition but also to constant steam, smoke and dirt, the proposed arrangements would allow moisture and dust to enter the space between the panes, obscuring the latter and fouling the means for operating the blind.

With the object of overcoming these dificulties, the arrangement according to the invention comprises a double window with the space -between the panes hermetically sealed and a blind adapted for being lowered or extended in the said space by means operated from outside the said space. Preferably, the panes are hermetically sealed around the entire peripheries thereof by sealing means held tight by removable mechanical means. With this arrangement, not only can the penetration of thermal radiation be reduced to a minimum and satisfactory provision made for adjusting the blind in the space between the panes, but also the said blindand the adjusting means will be completely protected, so that they will remain unalfected by the influences f the For pracweather, steam and so forth for indefinite pe riods.

In a preferred form of the invention, the blind together to leave the window substantially'unobstructed.

Advantageously the slats are iixedly connected to respective links of lazy tongs whereby the said blind is operated. With this arrangement, as will be understood, the slats are positively set in the inclined overlapping relationship, as. well aslowered or extended, by the" lazy tongs. Furthermore, the slats are collectedV together by even closing up throughout the length of the blind and not progressively from one end. Consequently, the window is not inconveniently obstructed in intermediate positions of the blind.

The blind may be operated through the intermediary of endless cablev means so devised that the blind is both opened and closed by a positive driving action. Reliance upon gravity or springaction can then be avoided. The Vblind may be operated by the power of an electric motorA enclosed in the sealed space between the panes of the window or enclosed in a sealed casing connected to the said space.

Examples of applications of the invention to the windows of railway coaches will now be described with reference to the accompanying drawings, in which:

Fig. l is a general inside elevation of a preferred window and blind arrangement,

Fig. 2 is a `diagrammatic view showing the cable disposition in the said arrangement, y

Fig. 3 a composite view to a larger scale,.the lower half being a side elevation with part of the frame broken away to show the lazy tongs and the upper half a vertical section at the middle of the window,

Fig. 4 an inside elevation of one side of the window, also to a larger scale and with `parts cf the frame broken away,

Fig. 5 a section on the line V-V in Fig. 4, 1

Fig. 6 a vertical section showing the mounting and driving 'arrangement for the motor,

Fig. 'l an inside elevation (with parts of the frame broken away) of a second arrangement,`

Fig. 8 a section on the line VIII-VIII in Fgf,

Figs. 9 and 10 are views similar to Figs. 7 and 8 of a third arrangement, and

Fig. 11 is a diagrammatic elevation showing a modification.

In all of the arrangements illustrated, the blind is of the nature of a Venetian blind, but has the individual slats I carried by lazy tongs 2 located at the sides of the window. The slats are conveniently of metal, for example aluminium or a light alloy, or of wood or artificial resin with a cellulose finish and are mounted upon corresponding inner links of the lazy tongs. In the arrangement illustrated in Figs. 1-6, in which the lazy-tongs are to be concealed from view by a housing 3, the ends of the slats are forced tightly into slots in the inner faces of Slat-holders 4 which extend substantially parallel to the inner links and are connected centrally thereto by necks 5 passing through a vertical slot 6 in the housing 3. As in the arrangements of Figs. 7-10, the slats may lalternatively be forced into slots between cheeks 'I on the faces of the inner links themselves or into slots cut in the said links. These modes of mounting the slats are not only simple and inexpensive, but permit of easy a.,- sembly of the said slats with the lazy tongs.

As shown in Figs. 1-6, the slats I are preferably provided with oppositely directed narrow flanges 8 at their longitudinal edges. These flanges not only stiffen the slats and assist in locating them in the parts 4 or 1, but also, by their overlapping in the lowered condition of the slats (Fig. 3), make it impossible to see through the blind. For merely stiffening the slats, these may alternatively be beaded or rolled at the longitudinal edges or a slat having a shallow W-shaped or curved cross-section may be employed.

The raised blind is to occupy a comparatively slight depth 9 (Fig. 3) at the upper part of the window (say one tenth of the total depth) and is to be lowered to a condition in which the slats slope downwardly and outwardly in slightly overlapping relationship at a small angle to the vertical, for example in Figs. 1-6 and 30 in Figs. 7-10. The fixed pivot |0 of each lazy tongs is secured to the respective side of the windowframe nearly at the top thereof, but leaving a space for driving mechanism to be described. For the sake of simple manufacture, the pivots between the links of the lazy tongs are preferably so-called drive screws.

In Figs. 1-6, the lowermost pivot of each lazy tongs is extended as a lug I I in the forked end of which one fall I21 or I22 of an endless cable I2 is secured. The course of this cable is illustrated in Fig. 2: Proceeding, say, to the left from the tensioning device I3, the cable passes round a pulley I4 which is located parallel to the window and is free on an axle I5 (Fig. 4) mounted in the window frame. The cable then passes down the side of the window, round a pulley I6 which is at right angles to the window and is free on an axle I'I, and up to a second pulley I4 free on the axle. I5. From this pulley, the cable passes across the top of the window to the upper side of a pulley-groove I8 on one flange of a wheel-body I9 mounted on an axle 20. Thence the cable passes round the under side of a similar groove I8 on the same flank of a second wheel body 2|. The path of the cable on the right-hand side then duplicates that on the left hand side. The returning cable finally passes over a groove I3 on the opposite flange of the wheel body 2| and under a groove I8 on the opposite flank of the wheel body I9.

Iii)

The grooves I8 serve to drive the cable I2 for raising and lowering the lazy tongs 2. Between the said grooves, each of the wheel bodies I9, 2| is formed as a worm-wheel meshing with a worm 22 on a shaft 23 extending vertically between the said wheels. The upper end of the shaft 23 carries the rotor 24 of an electric motor 25.

The falls |21, |22 are selected so that, when the 'cable is driven in the one or other direction, the lugs II will move up or down together, their movement being identical. The lazy tongs 2 are thereby moved positively in both directions. Gravity and spring action are not relied upon in any Way and the danger of jamming is minimised. The cable I2 may be prestretched and made of such ample strength that stretching in the course of time need not be feared. The cable will not slip and the blind will remain in the fully raised or a partially raised position even under con ditions of train vibration.

In Figs. 1-6, the frame of the window is made wholly of metal, preferably of extruded sections. The outer and inner panes 26 and 2'I are embraced between flanged outer irame parts 28 (Figs. 3 and 5) and the housing 3 which serves as a distance piece, a suitable spacing of the panes being 11A-1% inches. Rubber gaskets 29 and 3D separate the outsides and the edges of the panes 26 and 21 from the frame parts 28. A channel-shaped gasket 3| separates the insides of the panes 26 and 21 from the housing 3. The gasket 3|, in particular, may be connected to the panes by adhesive. When the above parts have been assembled, they are laid between two face plates by which the frame parts 28 are pressed together and a drift 32 is slid over hook-like formations 33 on the said parts 28 to lock the assembly together under a substantial compression. By this simple means, air tight joints are established all round the edges of the panes 2S, 2l without the use of screws. Moreover, this construction of window is light and is simple to manufacture and assemble.

Where the shaft 23 penetrates the frame, it passes through a sleeve 34 integral with a bracket 341 which is seated in the top of the housing 3 and in which the axles are mounted. A boss 35 on the casing of the motor is mounted over the sleeve 34 and is clamped air-tightly against the gasket 3| by a nut 36 screwed on the sleeve. To enhance the tightness of the joint here, the end of the boss 35 may be recessed to t over a compressible packing ring. The motor 25 is itself totally enclosed, all joints in its casing being carefully sealed, for example, by a bitumen compound. It will be seen that the blind and the mechanism, including the motor, are accommodated in a substantially hermetically enclosed space and consequently they remain always unaffected by the Weather, clean and in good order. As moisture and dust cannot enter, internal steaming, frosting and fouling are prevented. The window does not require to be taken apart for cleaning of the glass or slats. These properties do not materially deteriorate with time and are unaffected by thermal expansion effects. Preferably the window, blind and mechanism are made up as a unit before being fitted to the coach, as air and weather tightness can thus be best assured. An advantage of the enclosure of the blind is that its operation is not impeded bv the effects of wind or accidental obstruction; the blind may therefore be light and easy to operate,

The air which is sealed up in the double window may be dehydrated air. Alternatively or in addition, a small quantity of a dehydrating substance, such as silica gel, may be placed in the window before it is sealed up.

When the slat blind is fully lowered, it is eifective, in combination with the double window, in intercepting a large proportion of thermal radiation incident upon the window. Some radiation is reflected or absorbed by the outer pane 26. Of that which penetrates the pane 26, a large proportion is reflected outwardly or absorbed by the slats I. In any case no direct rays of the sun can pass the slats. Such heat as may be passed by the slats has still to penetrate the inner pane 21. Thus a very small proportion of the incident heat enters the coach. Nevertheless, a suflicient amount of diiused light enters the coach, such light pass-ing the slats by repeated reflection. By raising the blind to an intermediate position, the slats are turned towards the horizontal and an increased amount of light is admitted at the expense of decreased heat insulation. The outer surfaces of the slats may be highly polished to enhance the outward reflection of the heat. In practice, however, it'may be preferred to make both surfaces matt. made thermally absorptive and nis-hed to suit the interior of the coach.

If required, at least one of the panes, preferably the outer, may be made of thermally absorptive or tinted glass. panes may be internally frosted. By this means, the raised slats can be concealed without the necessity for providing a special blind-storage housing.

The motor is advantageously a simple twophase squirrel-cage induction motor with which special starting switch-gear, limit switches and so forth are not essential. Such a motor can be designed so that, if it continues to be excited after complete raising or lowering of the blind, it simply stalls and, in this condition, carries its short-circuit current harmlessly for a considerable period. The motors 25 of all the windows of a coach may be controlled by a common pressbutton switch operated by an oiiicial on the train. Alternatively the motors may be individually controlled by press-button switches 37 which may conveniently be mounted on or beside the motor 25 (Fig. 1) to shorten the wiring necessary. The

supply of two-phase current for the motors may l be taken from a small rotary converter.

In Figs. 7 and 8, each of the lugs Il is guided in a slot 3B in the frame .and is connected therein to one fall 3.91 or 392 of an endless cable 39. This cable extends from a driving member 40 at the top of the window to a pulley 4|, down the side of the window, round a pulley 42, acrossthe bottom of the window, round one groove of a double-grooved pulley 43, up the other side of the window to one groove of a double-grooved pulley 44, down the last-named side of the window, round the other groove of the pulley 43 and finally up the same side of the window and round the pulley 44 back to the driving member 40. The pulleys are mounted on ball bearings in recesses 45 in the frame. Upon movement of the driving member, the two lazy tongs 2 will be moved equally and in the same direction, as in the previous example. The length of the movement of the driving member 40 can be co-ordinated to the required lazy-tongs movement in any particular case by appropriate selection of the lazy-tongs pivots to which the lugs Il are connected.

The driving member 40 comprises a nut travel- The inner surface may be Over the depth 9, the 0 All ling upon a screw-spindle 46 mounted in ballbearings 4l carried at the sides of the frame. The nut has an extension 48 which passes through a slot 49 in a part of the frame and prevents the nut from turning on the spindle. Travel of the nut is limited by stops 50 at the ends of the slot. Above the slot, this extension 48 is forked to embrace the cable 39 and engages, with some play, between stops 5| fixed on the said cable. The spindle is driven by an electric motor 25 whose rotor is mounted directly on the spindle 46.

In this arrangement, the body-part 52 of the frame is made of hard wood and only the panesecuring parts 53 are made of metal. Both faces of the frame body'are recessed round their edges to receive the panes and sealing material for making a tight joint all round them.

In Figs. 9 and l0, the motor 25 drives the cable 39 directly through a worm 54 and worm-wheel 55 connected to the pulley 44. In this case, the lugs Il are connected to pivots at the ends of shortened lowermost links 56 of the lazy tongs 2 and move in slots 38 to one side of the centre line of the said lazy tongs. This arrangement permits of the worm 54 and motor 25 being disposed centrally at the end of the frame-part 51 closing the top of the window. The off-centre disposition of the slots 38 also results in the lazy tongs and the blind as a whole having a slight inclination to the frame of the window when the said blind is lowered. This inclination assists in reducing the effect of vibration upon the blind.

With this arrangement, if desired, the cable may be replaced by two cables, one passing round the pulleys at the four corners of the frame and the other passing round the pulleys at the righthand side of the frame only. The two cables are then adjustably coupled at a convenient point.

The links of the lazy tongs 2 in the arrangements described above may be made of unequal lengths as illustrated in Fig. 11, the vslats l being carried on the longer links. In this case, the slats pack up at a larger angle when the blind is raised which is of advantage if it is desired to use comparatively wider slats l in relation to the space between the panes 26, 21.

The above-described forms of mechanism, particularly the first-described, have many practical advantages: The operation of the blind is positive and silent. The mechanism comprises a few parts only and does not depend for its operation upon springs, automatic switches and so forth. It is therefore reliable and will give a long life. However, other forms of mechanism may be employed: Separate endless cables at the sides of the windowmay be driven from a motor at the top or bottom of the window through shafts extending from the motor to the adjacent pulleys and containing one or more flexible couplings. Orcables may be simply wound upon drums for raising the slats, gravity being relied upon to cause the slats to re-descend when required. Cable-transmission may even be dispensed with and lazy tongs may be driven from a motor through bevel gearing and screw-spindles, The lazy tongs may also be lever-operated: An example of this kind devised for direct manual operation will be briefly described: Corresponding uppermost links of the lazy tongs are extended upwardly beyond the i'lxed pivots and are connected together at their upper ends by a transverse horizontal bar. A rod connected to the middle of the said bar extends horizontally at right-angles thereto through a hole in an inside part of the window frame. The projecting part of the rod is covered in air-tight manner by a metal bellows. The inner end of the rod is engaged through the flat end of the bellows by the end of a screw mounted in a bracket on the frame and having a handle turnable from inside the coach. The arrangement is made such that, upon turning the screw in one direction, the lazy-tongs are raised through the levers formed by the extended top links and, upon turning the screw in the other direction, the lazy tongs are lowered by the weight of the slats and other parts.

The blinds may also be actuated otherwise than electrically or manually, for instance pneumatically.

In the arrangements illustrated, the blind is substantially rattle-proof, it cannot be over-operated and its slats cannot interlock with each other or the frame. However, other forms of Slat-blind may be employed, for example a fixedangle Venetian blind or a blind composed of channel-shaped slats which are raised and lowered between an extended and a nested condition by means of chains or cables.

Other forms of shutter or blind device may be used, for instance a blind which is rolled and unrolled. In this case and also with cable transmission, use may be made of a long motor with an external rotor upon which the blind or the cable-means is rolled up.

As an alternative for manual switch control of the blinds, provision may be made for automatic control by a thermostat exposed at 01 near the outside of a window to the suns rays. The thermostat may be arranged to energize motorcontrolling relays for a given period and after a certain time-lag whenever the temperature rises above or falls below a predetermined value.

I claim:

1. In window construction, in combination, means forming a continuously peripheral frame, a pair of panes hermetically sealed in said frame in spaced relation to one another to form a space therebetween, a blind reciprocably disposed between said panes within said space and adapted when lowered to cut oi thermal radiation through said panes while admitting a certain amount of light therethrough, and means including an operating device wholly disposed within said space for reciprocating said blind.

2. In window construction, in combination, means forming a continuously peripheral frame. a pair of panes hermetically sealed in said frame in spaced relation to one another to form a space therebetween, a blind reciprocably disposed between said panes within said space and adapted when lowered to cut oi thermal radiation through said panes while admitting a certain amount of light therethrough, said blind comprising a plurality of parallel slats adapted to nest together when the blind is raised and adapted to lie in uniformly spaced relationship in any position of the blind, and means wholly disposed within said space for reciprocating said blind.

3. In window construction, in combination, means forming a continuously peripheral frame, a pair of panes herm-etically sealed in said frame in spaced relation to one another to form a space therebetween, a blind reciprocably disposed between said panes within said space and adapted when lowered to cut oil" thermal radiation through said panes, said blind comprising a plurality of parallel slats adapted to nest together when the blind is raised and adapted to lie in uniformly spaced relationship in any position of the blind, and means wholly disposed within said space and connected to each of said slats to effect operation thereof.

4. In window construction, in combination, means forming a continuously peripheral frame, a pair of panes hermetically sealed in said frame in spaced relation to one another to form a space therebetween, a blind reciprocably disposed between said panes within said space and adapted when lowered to cut oi thermal radiation through said panes, said blind comprising a plurality of parallel slats adapted to nest together when the blind is raised and adapted to lie in uniformly spaced relationship in any position of the blind, and means including an endless cable connected to said blind for raising and lowering said blind.

5. In window construction, in combination, means forming a continuously peripheral frame, a pair of panes hermetically sealed in said frame in spaced relation to one another to form a space therebetween, a blind reciprocably disposed be tween said panes within said space and adapted when lowered to cut off thermal radiation through said panes, and lazy tong means connected to said blind and operable for raising and lowering said blind.

6. In window construction, in combination, means forming a continuously peripheral frame, a pair of panes hermetically sealed in said frame in spaced relation to one another to form a space therebetween, a blind reciprocably disposed between said panes within said space and adapted when lowered to cut off thermal radiation through said panes, lazy tong means connected to said blind and operable for raising and lowering said blind, and endless cable means connected to said lazy tong means to eiect operation thereof.

'7. In window construction, in combination, means forming a continuously peripheral frame, a pair of panes hermetically sealed in said frame in spaced relation to one another to form a space therebetween. a blind reciprocably disposed between said panes within said space and adapted when lowered to cut oi thermal radiation through said panes, means wholly disposed within said space and operable for reciprocating said blind, and power means disposed exteriorly of said frame but hermetically connected to said space for operating said means.

8. In window construction, in combination, means forming a continuously peripheral frame, a pair of panes hermetically sealed in said frame in spaced relation to one another to form a space therebetween, a blind reciprocably disposed between said panes within said space and adapted when lowered to cut off thermal radiation through said panes, means wholly disposed within said space and operable for reciprocating said blind, and power means disposed wholly within said space for operating said means.

9. In window construction, in combination, means forming a continuously peripheral frame, a pair of panes hermetically sealed in said frame in spaced relation to one another to form a space therebetween, a blind reciprocably disposed between said panes within said space and adapted when lowered to cut off thermal radiation through said panes, and a lazy tong at each Vertical side of said frame within said space connected to said blind and eiective upon actuation for opening and closing said blinds.

10. In window construction, in combination, means forming a frame, a pair of panes, means for mounting said panes in said frame in sealed spaced relationship whereby an air-tight space is formed between said panes, a blind, means mounting said blind for extensible movement between open and closed positions within said space, blind operating mechanism disposed within said space and connected to said blind, said mechanism being actuatable to effect movement of the blind, and means for actuating said operating mechanism.

11. In window construction, in combination, means forming a continuously peripheral frame, a pair of panes hermetically sealed in said frame in spaced relation to one another to form a space therebetween, a blind, means mounting said blind for extensible movement between open and closed positions within said space, said blind being adapted when closed to cut off thermal radiation through said panes, and means including an actuatable device wholly disposed within said space for eiecting movement of said blind between its open and closed positions.

12. A window construction comprising a plurality of spaced sheets of glass disposed in a sash frame and being sealed about their edges to provide a chamber sealed to exclude atmospheric dust, spaced parallel louver bars disposed in the chamber and being provided upon one side with highly reflective surfaces, said louver bars being rotatable about their longitudinal axis to control the radiation passing through the construction and means operable while the chamber is completely sealed to change the positions of the louver bars about their axis.

13. A window construction comprising a plutix rality of spaced sheets of glass disposed in a sash y frame and being sealed about their edges to provide a chamber sealed against atmospheric dust, spaced parallel louver bars disposed in the chamber and being provided upon one side with highly reflective surfaces, said louver bars being rotatable about their longitudinal axis to control the radiation passing through the construction and means operable while the chamber is completely sealed to change the positions of the louver bars about their axis, said means comprising an electrical motor sealed within the chamber and having operative driving connections with the louvers and being connected by conductors passing into the sealed chamber to means for supplying electrical current to the motor, said conductors also being in series with switch means for controlling the supply of current to the motor.

14. In window construction, in combination, means forming a frame, a pair of panes mounted in said frame in spaced relation to one another to form a space therebetween, a blind reciprocably disposed between said panes within said space and adapted when lowered to cut off thermal radiation through said panes while admitting a certain amount of light therethrough, said blind comprising a plurality of parallel slats adapted to nest together when the blind is raised and adapted to lie in uniformly spaced relationship in any position of the blind, a lazy tong at each vertical side of said frame within said space and connected to said blind and effective upon actuation for raising and lowering said blind, an endless cable operatively mounted within said space, means for connecting each ofsaid lazy tongs to said endless cable, and operating means connected to said cable and adapted upon actuation to raise and lower said blind.

15. In window construction, in combination, means forming a continuously peripheral frame, a pair of panes hermetically sealed in said frame in spaced relation to one another to form a space therebetween, a blind reciprocably disposed between said panes within said space and adapted when lowered to cut on" thermal radiation through said panes, a plurality of pulleys mounted on said frame within said space, an endless cable trained over said pulleys and connected to said blind, and electrically energizable driving means associated with said frame and connected to said cable to operate said blind.v

16. In window construction, in combination, means forming a continuously peripheral frame, a pair of panes hermetically sealed in said frame in spaced relation to one another to form a space therebetween, a blind reciprocablyv disposed between said panes within said space and adapted when closed to cut off thermal radiation through said panes, a plurality of pulleys rotatably mounted on said frame within said space, an endless cable trained over said pulleys, means forming a driving connection between said cable and said blind whereupon reciprocation of said cable moves said blind between its open and closed positions, and means for operating said cable.

17. In window construction, in combination, means forming a continuously peripheral frame, a pair of panes hermetically sealed in said frame in spaced relation to one another to form a space therebetween, a blind reciprocably disposed between said panes within said space and adapted when close to cut off thermal radiation through said panes, a plurality of pulleys rotatably mounted on said frame within said space, an endless cable trained over said pulleys, means forming a driving connection between said cable and said blind whereupon reciprocation of said cable moves said blind between its open and closed positions, an electric motor secured to the outside of said frame, and means forming a driving connection between said motor and said cable for operating said cable.

18. In window construction, inA combination, means forming a continuously peripheral frame, a pair of panes hermetically sealed in said frame in spaced relation to one another to form a space therebetween, a blind reciprocably disposed between said panes within said space and adapted when closed to cut oif thermal radiation through said panes, a plurality of pulleys rotatably mounted on said frame within'said space, an endless cable trained over said pulleys, means forming a driving connection between said cable and said blind whereupon reciprocation of said cable moves said blind between its open and closed positions, an electric motor secured to said frame within said space, and means forming a driving connection between said motor and said cable.

ALFRED HENRY CHILTON.

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