US2807296A

US2807296A - Wall-type chain mortising machine

Info

Publication number: US2807296A
Application number: US350280A
Authority: US
Inventors: Stoll Gottlieb; Schrag Georg
Original assignee: Individual
Current assignee: Individual
Priority date: 1952-04-26
Filing date: 1953-04-22
Publication date: 1957-09-24
Anticipated expiration: 1974-09-24
Also published as: CH311892A

Description

Sept. 24, 1957 G. STOLL ETAL 2,807,296 I WALL-TYPE CHAIN MORTISING MACHINE Piled'April 22, 1953 2 Shets-Sheet 1 FIG. 10

INVENTORS 6015132591, \StoZZ v y Geo r9 Jab-e Sept. 24,-1957 G. STOLL EIAL 2,807,296 WALL-TYPE CHAIN MORTISING MACHINE Filed April 22, 1953 2 Sheets-Sheet 2 JNV TOR: Got! Zia 670? y Gabi-9 \S'cZ. ray

Unitd States I Patent Ofiiice 2,807,296, 7 Patented Sept. 24, 1957 mamas WALL-TYPE CHAIN MORTISING MACHINE Gottlieb Stoll and Georg Schrag, Esslingen Neckar,

- Germany It is well known that chain mortising machines which are to be fixed to a wall or a column, so-called wall-type chain mortising machines, exist in various designs. There are designs in which the lower part is equipped with a clamping table to be fixed to the wall or a column, while the upper part containing the motor which can be raised and lowered by means of a hand-lever, may be shifted longitudinally and transversely on the lower part and inclined laterally and rotated on a vertical axle. Such a machine can be used in many ways, but it is an unwieldy device, and therefore expensive. Another disadvantage is that it has a great overhang as against the fastening surface and requires, in consequence, extremely rigid fixing. Another well-known design has a guiding frame for the motor driving the mortising chain and is arranged for longitudinal and transverse adjustment on an upper machine part which is to be fixed to the wall. On the lower end of this upper part the clamping table can be inclined in a vertical plane, and may, in case of need, be turned on a vertical axle. Other designs are known in which the driving motor of the chain mortising tool is guided in the upper part of the machine fixed to a wall or column, only for raising and lowering. In this case the upper part of the machine is provided at its lower end with a cross-slide together with a longitudinal slide for taking up the workpiece which longitudinal slide can be adjusted to various inclinations for mortising cotter-slots. This design enables a lighter construction which affords more favourable fixing facilities on account of the reduced overhang from the fastening surface. However, it cannot be used in as many ways as the first-mentioned type.

The object of the invention is an improvement of the last-mentioned type of wall chain mortising machines to the eifect that the cross-slide piloting the longitudinal slide is guided by an element fitted to the lower side of the upper part of the machine and adjustable on a vertical axle. Thus, the clamping table may not only be shifted longitudinally and transversely and swivelled to various inclinations, but it may also be swivelled horizontally. That is to say it is possible to give the workpiece any desired position with respect to the mortising chain-tool. The universal applicability of the machine resulting therefrom is achieved by a simple and easy construction. Y

A particularly favourable construction of the machine is obtained by adopting the following arrangements: The cross-slide is mounted in the rotary-adjustable support on the upper part of the machine by means of a journal screwed on to the setting spindle, so that it can swivel in a limited angle on the axle of the journal. Moreover, it can be fixed in various inclinations by means of a stop engaging with a tooth segment of the rotaryadjustable support, the teeth of the segment being arranged parallel to the sliding direction of the cross-slide, so that they keep in mesh with the stop when the crossslide is moved.

Apart from expensive rack-and-pinion gears operated by a handwheel, pivoted lever arrangements are also known for moving the longitudinal slide. In such arrangements the operating lever can be swivelled in a vertical plane behind the clamping surface of the longitudinal slide. According to the invention arswivelling lever for moving the longitudinal slide on a vertical axle, that is to say in a horizontal plane, is fitted pivoting on the cross-slide and with a bent arm, to a connecting-rod on the back of the longitudinal slide. The hand-lever protruding horizontally beyond the longitudinal slide is much easier to operate than a lever swinging in a vertical plane behind the clamping surface of the longitudinal slide. A further new feature of the invention is that the swivelling range of the hand lever is equal to a fraction only of the entire sliding-way of the longitudinal slide, whereby the connecting-rod for the longitudinal slide is provided with various working points for the hand-lever in order to obtain various shifting-ranges. Whereas in the designs known hitherto the swivelling range of the hand-lever is in correspondence with the total path of the slide, in the present invention the power required for moving the slide is considerably reduced which facilitates work, especially where it is a case of long and heavy workpieces, and renders possible precise and careful adjustment of the slide. Another feature of the invention is that the lever can be shifted to another range easier and quicker by connecting several mortise borings of the connecting-rod by a longitudinal slot for a connecting pin of the hand-lever, and making the handlever movable upwardly to a limited extent only Whereby its connecting pin is moved out of the mortise boring of the connecting-rod, and a lighter guide-bolt fitting into the connecting slot is ready to pass into another mortise hole.

The longitudinal slide is guided along the cross-slide preferably by means of a pair of round bars on the longitudinal slide placed one on top of the other and inserted between its front walls. The round bar guidance is simple and of great precision. It permits, in addition, of correcting the position of the clamping slide in correspondence with the mortising chain path in order to obtain equality in the thickness of checks of the workpiece on both sides of the finished mortise. For this purpose, for instance, the longitudinal slide may be adjusted transversely in moderate degrees as against the lower round bar by swinging it on the upper round bar. In a preferential embodiment of the invention the lower round bar is conducted through the front walls of the longitudinal slide with a clearance for lateral movement, and rests on straps on the outside of the front walls which straps are fixed transversely adjustable on the front walls. Apart from that set screws adjustable to the lower round bar may be provided in the front walls of the longitudinal slide for adjusting the oblique position of the slide. Re-

adjustment of the slide may also be realized by mounting the lower round bar passing through the front Walls of the longitudinal slide with a clearance for lateral movement, on the straps arranged for swivelling on the out side of the front walls, by means of eccentrically arranged end-journals, and making it rotatable by a hand-lever fixed on one of the eccentric journals.

Other characteristic features of the invention are described together with the embodiments of the invention illustrated in the accompanying drawings, in which:

Figure 1 is a front elevation of the machine, Figure 2 is aside elevation of the machine, Figure 3 is a section taken on line III'III of Fig. 1, Figure 4 is a its sliding drive,

Figure 5 is a section taken on lineV-'V'of Fig.4; Figure 6 is'a front view of the longitudinal slide with theadjustmentdevice,

plan view of the longitudinal slide with Figure 7 is a section taken on line VII-VII of Fig. 6,

Figure 8 is a front view of the longitudinal slide of another embodiment of the adjustment device,

Figure 9 is a section taken on line IXIX of Fig. 8,

Figure is a cross section of a detail taken on line XX of Fig. 1,

Figure 11 is a cross section of a detail taken on line XL-XI of Fig. l, and

Figure 12 is a cross section of a detail taken on line XII-XII of Fig. 3.

The upper part of the machine has a box-like stand 1 which at its four corners is provided with eye-lugs for fixing it to a wall or column. In front of the partly-open front of the box-like frame or stand 1 two vertical guide columns 4 are inserted between eye-lugs 3 protruding ahead on which columns 4 the mortising chain driving motor 5 with lateral guiding eyes 6 is mounted for raising and lowering. Motor 5 drives in well-known manner the mortising chain 7 by means of a chain-wheel mounted on its shaft, which mortising chain 7 is conducted around a guiding-bar 8 fixed on the front of the motor and. directed downwards. The motor 5 is suspended together with a pedestal 9 in a lever-arm 11 by the use of intermediate levers 10, the lever-arm 11 swivelling on an axle 12 rigidly arranged in frame 1. The lever-arm 11 is the longer arm of a double lever, the shorter arm of which is connected with a tension spring 14 arranged along and near the back wall of the box-like frame 1 and fixed at its bottom end. The attachment may be made adjustable for changing the tension of the spring. Preferably two springs 14 are provided, running parallel to each other and attached to twofork ends of lever 13. By springs 14 the motor is kept in the highest position as illustrated in Figs. 1 and 2 in which the mortising chain 7 may be moved against a workpiece.

In the embodiment of the invention illustrated by Figs. 1 and 2 the motor is raised and lowered by a hand-lever. Hand lever 15 is connected with a head piece 16 mounted on an upper face of the transmission lever 11. Lever 15 or, respectively, headpiece 16 is not, however, rigidly connected with lever arm 11, but in such manner only as to give it a possibility of swinging out laterally to a limited extent. In the above embodiment of the invention such possibility of swinging out laterally is provided in that the head piece 16 can swing on a front fixing. screw 17 and that it has a moving clearance against a back fixing screw 18. The rear end of head piece 16 is formed into a locking pawl 19 which, as soon as the highest position of the hand lever 15 is reached and the hand lever. 15 swings out laterally, notches in the back of a catching pin 20 projecting from behind the upper part of frame 1. Therefore, when a working stroke is to be executed, the hand lever 15 must first be swung out a little laterally, so as to disengage pawl 19 from the catch pin 20, and thereby release the hand-lever for turning t it down. In this manner security is obtained against unintentional switching-on of the machine.

On a side-wall of frame 1 (Fig. l on the left) the motor-switch 21 is fixed. One of the fork ends of the switch lever 22 of the motor switch extends to the operation range of a stop 23 arranged on a lateral lug 24 of the motor guiding eye 6 on the switch side. The arrangement is such that as soon as the motor has arrived at the highest position, the switch is off,'and it is on when the cage is going down so that the mortising chain rotates. When returning the motor to its uppermost position, switch 21 is off again. The lead wire 25 between the motor and switch is conducted along a cut-out'26 in the side-wall of frame 1. Moreover, a rod 27 is arranged parallel to the guide column'4 on which rod movable end-collars 28 and 29 are arranged which may be fixed by set-screws 30. As an accessory to these end-collars there is a stop pin 31 arranged for shifting'inan'd out on lug 24 of the motor below the control pin 23 of the motor switch. In Fig. 2 stop pin 31 is shown shifted out, in which position the stop pin as well as the control pin can pass the upper stop ring 29, and will hit the lower stop-ring 28 only which is then the lower stroke limit. In this case, therefore, the motor is moved back to the highest position while the switch 21 is again placed to off-position. When the stop pin 31 is moved inside after lowering of the motor, the upper stop ring 29 constitutes an upper stroke limiting stop, and the motor can be raised or lowered within the positions limited by rings 28 and 29. Stop 23 remaining below switch lever 22 of motor switch 21, the motor is not switched off during the upstroke, i. e. the mortising chain 7 keeps running continuously as long as the operation is carried on with this limiting of the stroke.

A guide element. 33 is fixed to the lower side of the box like frame 1 by means of a flange 34. Flange 34 is centered in a boring at the bottom of the box by means of a journal 35. The guide element 33 is attached to the bottom of the box by means of a fixing screw 37 screwed from above into journal 35 through a covering disc 36 overlapping the boring of the box. By loosening screws 37 and 38, the firm initial tension of flange 34 with the bottom of the box is relaxed, and element 33 may be turned on the axis of its journal 35. The extent of the turningmay be read off for instance from a graduated scale of flange 34 by means of a stationary indicator fixed at the bottom of the box. Element 33 is, therefore, fixed for adjustable turning on the lower end of the upper ma chine part. Moreover, flange 34 is screwed on fast to the bottom of the box from below by for instance two screws 38 passing through arc-like slots of the flange.

Element 33 serves for guiding a cross-slide 40. This cross-slide 40 is (see particularly Fig. 3) inserted in a cross boring of guiding element 33 by means of a guide pin. and is screwed on to a threaded spindle 42 which is connected with a turnable handwheel 43 on the op posite end of the guiding element 33, but fixed in the direction of the axis. In order to prevent cross-slide 40 from swinging on the axi of its guide-pin 41, a holding pin 45 is made to clutch with a tooth arrangement 46 in an arm 44 overhanging the sliding body laterally and backwards, which tooth arrangement is arranged on arm 48 of the rotatably-adjustable guiding element 33. The holding pin 45 the end of which is adapted to fit into the tooth-spaces of tooth arrangement 46, is movable in arm 44, and secured against being over-turned. It is of advantage to provide a spring-not illustrated-which presses the holding pin 45 automatically into the tooth arrangement 46. For operation the holding pin 45 has a handle 49. By introducing the holding pin into various tooth spaces the cross-slide 40 may be adjusted to'various inclinations. The tooth arrangement 46 is made parallel to the shifting direction of the cross-slide so that when shifting the cross-slide, the meshing of the holding-pin 45 is maintained. The cross-slide is shifted by turning the handwhecl 43whereby the threaded spindle 42 turning with it either pushes the stationary guide pin 41 of cross-slide 40 outside, or draws it inside. The swinging movement of cross-slide 49 is limited downward by tooth 50 of [toothsegment 46 which tooth 50 protrudes in radial direction over the other teeth of the tooth segment 46 as far as to forman abutment for the holding pin45 in its disengaged tposition.

Cross'slid'e" 40 is the guide for longitudinal slide 52. Two round bars 53 are used for guiding same. These bars 53 are inserted between front walls 54 leading backwards, of the longitudinal slide 52, and are movable in borings. of the cross-slide arranged vertically one above the other. A- hand' lever 55 is provided for moving the longitudinal slide 52,,along the cross-slide, which hand lever 55 is positioned to rotate in a vertical upright socket 57 of the cross slide. The hand lever extends above over the cross-slide toward the front, and is connected, by means of lever-arm 58, to a connectingarod 59 which is swingabl'y' connected in a horizontal plane to an eye 60 projecting from the back of the longitudinal slide 52. The shifting movement of the longitudinal slide can be limited on both sides by rod members 51 fitted for adjusting and fixing in the front wlalls of longitudinal slide 52, and operating by abutting against the side surfaces of cross-slide 40, Fig. 3. The length of the short lever-arm 58 is such that with a swivelling range of the hand-lever 55 of about 90 the longitudinal slide is travelling only a fraction of the total length of its shifting range. In order to control the total shifting range of the slide the connecting-rod isfor connecting the leverarm 58-provided with several, for instance three mortise holes 61 for the connecting pin of lever 58. In the present embodiment of the invention the mortise holes 61 of the connecting-rod 59 are connected with each other by longitudinal slots 62 (see Fig. 4). The mortise pin of lever arm 58 is made up, as shown in Fig. 5, by a socket 63 in which a pin 64 is inserted fitting into the slots 62 of connecting rod 59, and it is held against the lower side of the connecting-rod 59 by a spring 65 with a lower stop-dog 66. When hand-lever 55 or, respectively, its short lever-arm 58 is to be changed over to another mortise hole 61, it is slightly raised whereby its journal 56 moves upwards in its bearing. At the same time the socket 63 forming the mortise pin is disengaged from the connecting-rod 59, whilst pin 64 places itself with head 66 on the lower side of connecting-rod 59, that is to say it remains engaged with the connecting-rod. Now the hand-lever 55 can be pivoted laterally in raised position, whereby pin 64 slides into one of the longitudinal slots 62. During this lateral swing-out movement socket 63 forming the mortise pin will then by itself fall into the next mortise hole 61 when the force directed upwards is no longer exercised on the hand-lever. I

The longitudinal slide 52 serves the purpose of clamping the workpiece. Its front may be equipped with a supporting rib 68 for the workpiece. A screw 69 is provided for keeping the supporting rib 68 in position, which screw extends through a vertical slot 70 of the supporting rib and is screwed onto the body 52 of the slide. In order to prevent over-swinging the supporting rib 68 is guided in a groove 71 of the body of the slide. After loosening screw 69 the supporting rib may be adjusted upward or downward to correspond with the size of the workpiece. Moreover, it may be removed entirely by completely u-nscrewing the screw. The workpiece is pressed against the front surface of longitudinal slide 52 in the usual manner by a clamp 72, and is thereby held fast. In order to fix the clamp holder 73, the lower end of slide 52 is provided with bore-hole 74 in which pin 75 of holder 73 may be fixed by means of set screw 76.

For adjusting the workpiece to the mortise chain 7 the following methods may be followed:

The longitudinal slide 52 can be shifted in the longitudinal direction along the cross slide 40 by moving the hand lever 55, and by turning the hand wheel 43 in transverse direction together with the cross slide. By the longitudinal shifting of the slide 52 with the workpiece clamped thereon, the slot produced in the workpiece, by the mortising chain after themotor has been moved downwardly canbe'widened. .The position of the slot in transverse direction of the workpiece may be adjusted by shifting the cross slide. If key seats are to be cut, the longitudinal slide 52 is correspondingly adjusted in vertical plane. As describedabove, this can be made by disengaging the holding pin 45 and turning the cross slide 40 round the axis of'its guide pin 41, and then lock.- ing the holding pin 45 in a corresponding tooth space of the tooth segment 46 on part 33 to the desired inclination. If oblique slots are to'be cut, the longitudinal slide 52 must have a corresponding shifting position in horizontal plane. For this purpose, the [part 33 is turned around the vertical axis of its pivot 35. Thus the longitudinal slide 52 together with the workpiece can be adjusted in position with regard to the mortising in order to precisely adapt the clamping surface of its workpiece to the run of the mortise chain. With theround-bar guidance 5353 provided here this readjustment can be achieved in a very simple manner.

According to Figs. 6 and 7 the lower round bar 53 passes through bores 54 of the front walls 54 of the longitudinal slide 52. The bores 54' have a larger di ameter than the round bar 53 which is journalled in lugs 79 with end journals 78 the diameter of which is smaller than that of the round bar 53. The lugs 79 are adjustably fixed on the outside of front-Walls 54 by means of a fastening screw 81 passing through a slot 80 transversely to the longitudinal direction of the slide. This makes possible, by swinging the longitudinal slide 52 around the upper round bar 53, to set the longitudinal slide 52 in an oblique position by small degrees to the lower round bar. In order to achieve this it is simply required to loosen the fixing screws 81 of the lugs 79, to

swing .out the slide from the lower round bar, and to.

tighten the screws again in the new position. For precise adjustment of the oblique position of the slide, setscrews 82 are provided in the front-walls 54 of the longitudinal slide, which set-screws are adjustable against the lower round bar 53.

In Figs. 8 and 9 another embodiment is shown of the device for readjusting the longitudinal slide 52 to the lower round bar 53. Here too the lower round bar has a margin all around for its movement in large bore holes in the side walls 54.- Lugs 84 rotatably mounted on pins 83 are provided on the outside of the front-walls 54 in which lugs the lower round bar 53 is journalled with eccentrically arranged light end-journals 85. On one frontside of the table the eccentric journal 85 projects through lug84 and has a hand-lever 86 on its free end. Turning the lower round bar 53 by means of this hand-lever,-

the lower end of the slide 52 is moved transversely to the lower guide-rod 53 in consequence of the eccentric arrangement of the pin 83. The extent of the transverse adjustment may incase of need be read off a scale acting in conjunction with the hand-lever 86.

On both sides of the mortise chain 7 sliding

rods

88 and 89 are provided in the manner known hitherto, one

of which rods (89) has a chip breaker 90 at its lower end, while the other one is provided with a sliding foot 91. Both these sliding rods are, in the embodiment Figs. 1 and 2, guided in a protective casing 93 on the front, swinging around a vertical axle on motor cage 5. The downward movement of the sliding rods is limited by set collars 94, 95 which serve at the same time as deadweights and are adjustably fixed at the upper ends of the sliding rods projecting from casing 93. When lowering the mortise chain driving motor, at first the chip breaker 90 of the sliding rod 89, and following it the sliding shoe 91 of rod 88, superimpose themselves on the workpiece on both sides of the mortising chain penetrating the workpiece. In the embodiment according to Fig. 10 the sliding

bars

88 and 89 are made as rectangular bars and are thus safe against turning. Their sliding guidance is formed by grooves 96 open on one side, arranged on the inside of the protective casing 93, and passing through the wholelength. The sliding rods are secured against falling out of the grooves 96 by pins 97 which at least at two points extend across the grooves.

The operation of the machine is as follows:

,When the hand lever 15 is first swung away laterally from the catch pin 20 and then downwardly, also the motor 5 with the mortising chain 7 ismoved downwards and simultaneously the spring 14 is tensioned. As described above, the switch lever 22 of the motor switch is turned so that the motor will be switched on after a short downward stroke before the mortising chain has reached the workpiece clamped on the longitudinal slide 52. During the further downward movement of the motor the mortising chain penetrates into the workpiece producinga slot which may, as described above, be extended by lateral shifting of the longitudinal slide 52 by means of the hand lever 55, or which, depending on the adjusting position of the slide, may be a key seat or an oblique slot. The downward movement of the motor which determines the depth of the slot is limited by the stop pin 31 at the lower end collar or stop ring 28. After;

the slot is cut, the handlevcr is released, whereupon the spring 14 brings the motor automatically back into its upper end position and the mortising chain out of theworkpicce. During the last portion of the return stroke the switch lever 22 is turned and the motor automatically switched off. If it is desired not to switch off the motor, the stop ring 29 is brought into its effective position where it limits the upward movement of the motor before the motor is switched off.

We claim as our invention:

1. A chain mortising machine comprising a frame adapted to be secured to a vertical support, a motor mounted on said frame for vertical adjustment thereon, a tool and tool mount unit connected to the motor and extending downwardly therefrom, a guide element rotatably adjustable around a vertical axis on the lower side of the frame to extend vertically therefrom, a cross slide mounted on the guide element to be adjustable in a horizontal plane, a stationary guide pin for the cross slide to adjustably support the latter in a horizontaldirection, a spindle in threaded engagement with the guide pin and having means to rotate the spindle, the cross slide being rotatable with the guide pin limited in its movement by the guide element, and means mounted on the cross slide and the guide element to lock the cross slide in adjusted position.

2. A chain mortising machine comprising a frame adapted to be secured to a vertical support, a motor mounted on said frame for vertical adjustment thereon, a tool andtool mount unit connected to the motor and extending downwardly therefrom, a guide element rotatably adjustable around a vertical axis on the lower side of the frame to extend vertically therefrom, a cross slide mounted on the guide element to be adjustable in a horizontal plane, a longitudinal slide mounted for sliding movement on the cross slide and adapted to receive and clamp the work to be mortised, a hand lever connected to the longitudinal slide to move the latter on the cross slide, and a connecting rod connected to the longitudinal slide at one end and the other end to a short lever arm of the hand lever.

3. A chain mortising machine comprising a frame adapted to be secured to a vertical support, a motor mounted on said frame for vertical adjustment thereon, a tool and tool mount unit connected to the motor and extending downwardly therefrom, a guide element rotatably adjustable around a vertical axis on the lower side of the frame to extend, vertically therefrom, a cross slide mounted on the guide element to be adjustable in a horizontal plane, a longitudinal slide mounted for sliding movement on the cross slide and adapted to receive and clamp the work to be mortised, a hand lever connected tothe longitudinal slide to move the latter on the cross slide, and a connecting rod connected to the longitudinal slide at one end andthe other end to a short lever arm of the hand lever, the short lever arm having a plurality of points for connection of the short lever arm to the connecting rod. 1

4. A chain mortising machine comprising a frame adapted to be secured to a vertical support, a motor mounted on said frame for vertical adjustment thereon,

a tool and tool mount unit connected to the motor and extending downwardly therefrom, a guide element rotatably adjustable around a vertical axis on the lower side of the frame to extend vertically therefrom, a cross slide mounted on the guide element to be adjustable in a horizontal plane, a longitudinal slide mounted for sliding movement on the cross slide and adapted to receive and clamp the .work to be mortised, and a plurality of circular bars provided one over the other for the longitudinal slide whereby the bars provide the means to guide the longitudinal slide on the cross slide, the longitudinal slide being swingable about the lower circular bar to adjust the path of movement of the mortising tool.

5. A chain mortising machine comprising a frame adapted, to be secured to a vertical support, a motor mounted on said frame for vertical adjustment thereon, a tool and tool mount unit connected to the motor and extending downwardly therefrom, a guide element rotat ably adjustable around a vertical axis on the lower side of the frame to extend vertically therefrom, a cross slide mounted on the guide element to be adjustable in a horizontal plane, a longitudinal slide mounted for sliding movement on the cross slide and adapted to receive and clamp the work to be mortised, a plurality of circular bars provided one over the other for the longitudinal slide whereby the bars provide the means to guide the longitudinal slide on the cross slide, the longitudinal slide being swingable about the lower circular bar to adjust the path of movement of the mortising tool, and lugs provided secured to the longitudinal slide whereby the lower circular bar is adjustably mounted relative to the longitudinal slide.

6. A chain mortising machine comprising a frame adapted to be secured to a vertical support, a motor mounted on said frame for vertical adjustment thereon, a tool and tool mount unit connected to the motor and extending downwardly therefrom, a guide element rotatably adjustable around a vertical axis on the lower side of the frame to extend vertically therefrom, a cross slide mounted on the guide element to be adjustable in a horizontal plane, a longitudinal slide mounted for sliding movement on the cross slide and adapted to receive and clamp the work to be mortised, the longitudinal slide having walls extending backwards therefrom, and rodlike stops provided in said walls to limit the longitudinal movement of the slide by means of projections on the cross slide.

7. A chain mortising machine comprising a frame adapted to be secured to a vertical support, a motor mounted on said frame for vertical adjustment thereon, a tool and tool mount unit connected to the motor and extending downwardly therefrom, a guide element rotatably adjustable around a vertical axis on the lower side of the frame to extend vertically therefrom, a cross slide mounted on the guide element to be adjustable in a horizontal plane, a longitudinal slide mounted for sliding movement on the cross slide and adapted to receive and clamp the work to be mortised, a plurality of circular bars supported on the frame and on which the motor is slidably mounted, and a lever arm'pivotally mounted on the frameand connected to adjust the motor, a catch pin being mounted on the frame to hold the lever in the upper raised position of the motor.

References Cited in the file of this patent UNITED STATES PATENTS 495,350 Loetscher Apr. 11, 1893 7 642,073 Brown Jan. 30, 1900 646,125 Meserve Mar. 27, 1900 673,378 Brown May 7, 1901 1,620,895 r Kandera Mar. 15, 1927 1,892,246 Mohns- Dec. 27, 1932 2,645,255 Francescatti et al. July 14, 1953 FOREIGN PATENTS 3,537/26 Australia Aug. 30, 1926