GB2063754A - Glazier's point driving tool - Google Patents

Abstract

A tool for driving glazier's points P3, P2 of different size and shape has a magazine formed by a vertical bore 164 and notch 170 containing a rod 166 with three cut out portions extending along its axis. On rotating the rod to align a cut out portion with notch 170 a channel is formed whose crossection is adapted to receive a stock of points. A spring (152) biasses the stock downwards so that the lowest point is aligned with a driving plate 138 projecting forwardly from block 134. Varying drive force Clockwise rotation of lever 116 retracts block 134 against spring 130 then releases the block to drive a point. Lever 116 is pivoted about eccentric cam shaft (119, Fig. 8). Rotation of shaft 119 thus alters the position at which lever 116 releases block 134 and hence alters the drive force. <IMAGE>

Description

SPECIFICATION A tool for setting panes of glass in a sash or frame TECHNICAL FIELD This invention relates generally to improvements in devices for driving glazier points, and deals more particularly with an improved magazine for such a glazier's tool, as well as improved means for driving points of different size from the stack of points stored in such magazine.

STATEMENT OF INVENTION AND ADVAN TAGES According to the invention there is provided a tool for use by a glazier to set glass in a frame or sash, and comprising: a frame having a hollow portion extending from the point driving position of the tool, into which hollow portion an inserted part is located, which part includes one or more points and support means for accommodating and securing differently sized cutting points in the hollow portion of the tool or in a position to be driven by the tool.

Further according to the invention there is provided a tool for setting window glass comprising a frame and a driving plate for driving each of a stack of points in turn, a magazine for storing the stack of points, trigger means for operating the point driving plate, means for biasing a stack of points toward a position in which the endmost point is in position to engage the sash or window frame an insert member having a first guide surface for engaging a point of a first size and shape, and a second guide surface for engaging a point of a second and different size and shape to contact sash or frame, means for mounting the insert member in the frame to cooperate with the points in a stack of predetermined size, the insert mounting means providing support for the insert member in a first and a second position alternatively, and the stack biasing means and the driving plate adapted to operate with the insert member in both the alternative positions.

In its presently preferred form, a device of the present invention includes a frame of generally inverted U-shape, having a toe and a heel such that the toe portion can be placed against the wood sash, and the frame used by the glazier to hold the glass in place while the point is driven into a wood sash. A guide block assembly is slidably mounted in the frame and includes a driving plate which engages the lowermost point in the magazine to drive it from the stack. A trigger mechanism is provided for cocking the block, and for releasing it so that a compression spring moves the block along a fixed path in the frame to drive the point.The trigger mechanism includes an operating level, a return spring and pivot means defining an axis for movement of the operating lever, which pivot means includes an angularly adjustable eccentric cam shaft for varying the location of the lever pivot axis in the frame relative to the path of movement of the guide block. A lost motion means is provided between the operating lever and the guide block such that return movement of the operating lever can be achieved independently of the driving movement of the guide block.The magazine is adapted to accommodate points of various sizes by means of an insert provided in the magazine, which insert defines a first guide surface for engaging a stack of diamond shaped points, and a second guide surface for engaging a stack of points of still different size and shape, with a third guide surface being provided in order to accommodate the points of still a third size and shape. The insert is rotatable in the machine frame, and a ball or follower means is provided to urge the stack of points downwardly so that the Jowermost point occupies a position to be driven by a plate associated with the guide block, and to clear the insert means itself. This follower is spring operated and so arranged as to be manually moved against the force of the spring from its active to an inactive position in order to permit reloading of the magazine.

Rotation of the insert is possible when all points have been removed from the device, and allows reloading the magazine with points of different size and shape.

One aim of the invention is to provide a point driver with an improved magazine such that points of various size and shape can be accommodated in a single structure, and with provision being made for use of a spring loaded ball or follower arrangement for holding the stack of points in the magazine. A second aim of the invention is to provide a glazier's tool in which critical adjustment can be made to the impact force exerted by the coil compression spring acting upon the guide block and point pusher plate, such adjustments being provided for in a convenient and repeatable manner so that the above described advantage, in terms of the accommodation of points of various size, can be achieved in a device wherein the impact force exerted on the point can be conveniently adjusted so as to be optimized for a particular size and weight glazier's point.

SPECIFIC DESCRIPTION One embodiment of the invention will now be described, by way of example only with reference to the accompanying illustrative drawings in which: Figure 1 is a side elevation of a glazier's tool according to the present invention; Figure 2 is a top plan view of the point driver of Fig. 1; Figure 3 is a horizontal section taken gener ally along the line 7-7 of Fig. 1 and illustrating the insert of Fig. 2 in one of three alternative positions.

Figure 4 is a section generally similar to Fig. 3 but illustrating the insert rotated to a position approximately 120 from the Fig. 3, the position being such that a point of slightly smaller size can be accommodated.

Figure 5 is a section generally similar to Figs. 3 and 4 but illustrating the insert rotated to a still different position so as to accommodate glazier's points of smaller size than those shown in Figs. 3 and 4.

Figure 6 is an enlarged view of the lower position of the device of Figs. 1 to 5, and a trigger mechanism thereof is illustrated in two positions, the solid line position indicating an intermediate one for the operating lever and the slide block, and the broken line position illustrating a position for the trigger and slide block following driving movement of the latter, and more particularly at the moment of manual release of the handle.

Figure 7 is a vertical section taken generally along the line 11-11 of Fig. 6.

Figure 8 is a section taken generally along the line 12-12 of Fig. 6.

Figure 9 is a section taken generally along the line 15 of 13-13 of Fig. 6.

The glazier's tool according to the invention illustrated, referring to all of Figs. 1 to 9, comprises an inverted U-shaped frame (shown in Fig. 1) having a rear leg 110, a handle portion 112, and a forward leg 114 which defines an opening or magazine for the stack of points to be driven. This magazine for holding the stack of points to be driven will be described in greater detail hereinbelow, but applicant first desires to describe the mechanism for driving these points.

The operating lever 116 comprises a bellcrank with a lower depending arm 1 24 having end portion 1 26 for engaging a slide or guide block assembly 1 28 slidably received In the lower end of a crank arm, and having a spring 147 provided at the end of the crank arm 1 24 and the upper end of the member 1 26 which engages the slide block 1 28. The forward end of the member 1 26 is bevelled or canted slightly as shown in Fig. 1 so that upon achieving cocking movement of the slide or guide block assembly 128, the pusher or drive plate 1 36 will move forwardly achieving the desired displacement of the coiled com pression spring 1 30. Upon release by the user of the operating handle 11 6, member 1 26 will engage the upper surface of block 1 34 during its return movement, causing retraction of the member 1 26 and allowing it to reassume the position shown for it in Fig. 1 preparatory to driving another point from the lower end of the magazine.

In order to provide for a force on the point to be driven such that this force can be varied, depending upon the size of the pcint in the stack stored in the magazine, provision is made for pivoting the operating lever 11 6 about an axis which can be adjusted with reference to the line of action of the slide or guide block assembly 1 28. As best shown in Figs. 6 and 7, the pivot axis of the operating lever 11 6 is defined by an eccentric cam shaft of which a screw 11 8 is shown in Fig. 6 such that rotation of the screw will serve to vary the distance between the pivot axis for the lever 11 6 and the line of action for a block 1 34 of the slide or guide block assembly 1 28. The eccentric cam shaft provides an adjustable pivot axis for the operating lever 11 6 in order to vary the geometry between the tip of plunger 1 26 and the upper forward corner of the block 1 34 so that the point at which the drive block assembly is released for driving movement of the lowermost point in the stack can be closely controlled.As so constructed and arranged this of course provides for controlling the force with which the point is driven as a result of the fact that varying this geometry provides for control of the stored energy in the spring 140.

Fig. 8 shows the eccentric cam shaft as comprising the screw 118, with an offset shoulder 119, and the axis of the cylindrical shoulder 11 9 is displaced with respect to the axis of the screw 11 8. By varying the angular orientation of the screw 11 8 the geometry of the plunger tip can be adjusted as described above, that is with reference to the line of action of the slide or guide block assembly 1 28 (not shown in Fig. 8).The above described improvement to controlling the force exerted by the compression spring 140 represents a substantial advance over the prior art in that the prior art adjustment features were all accomplished in the slide or guide block assembly which moves at a rapid rate of speed and which is subjected to large and abrupt acceleration and inertia forces as the point is driven into the wood sash by the operator of the above described glazier's tool.

By providing the removable parts for achieving this adjustment of the driving force outside of the environment of the slide or guide block assembly more accurate control can be maintained over this force, and it is a feature of the present invention this force can be varied so as to drive points of different size in the same driver with a force of optimum intensity.

The frame of Fig. 1 driver is a generally cylindrical magazine provided in the forward leg 114 of the frame to receive a unique insert, best shown in Figs. 3, 4 and 5 at 1 66.

A cylindrical upwardly open bore 1 64 is provided in the lower leg 114 of the frame of the device, and the insert 1 66 is shown in one position in Fig. 3, that is in position for driving triangular points P3 of the largest size normally used. Fig. 4 shows the insert 1 66 rotated approximately 120 counterclockwise in order to accommodate diamond shaped points P2 of intermediate size, and Fig. 5 shows the insert 1 66 rotated through a still further angle to present a relatively small guide surface adapted to orient relatively small diamond shaped points P1.

All three point sizes and shapes are adapted to be received in the magazine and to engage one of the three guide surfaces defined at angularly spaced locations in the cylindrical surface of the insert 1 66. For example, in Fig.

3 the relatively large triangular insert P3 has one apex of its triangle received in the notch 170, and has the base of the triangle received in the cut away portion 1 67 of insert 1 66 as shown to best advantage in Figs. 4 and 5.

Similarly cut away portions of the insert are provided for defining guide surfaces to accommodate the inserts P1 and P2 respectively, and means may be provided for releasably retaining the insert 1 66 in the magazine cavity 1 64 in any one of these three angular orientations as depicted in Figs. 3, 4 and 5.

Although not shown, a ball detent subsassembly may be used for this purpose with the spring loaded ball in a barrel which is provided threadably in a cavity defined for this purpose in the insert. Three detents would preferably be defined in the cylindrical side wall of the cavity 64 in order to receive the ball in the three different positions required for accommodating the points of the three different sizes shown, that is P1, P2 and P3.

The points are thus retrained in the magazine between the insert and the side wall defined by the forward leg of the frame.

These points are urged downwardly by a follower or ball 1 52, which ball has a spring associated therewith so that one leg of the Ushaped ball engages the top of the stack of inserts in the magazine and so that the other leg is engaged by the spring acting between the frame and the lower end of the ball for biasing the ball in the desired direction. The spring force provided by the ball spring can be manually overcome by the user as a result of grasping the U-shaped upper portion of the ball 1 52 and pulling it upwardly. Rotating the ball to one side, as suggested in Fig. 2 by the broken lines in that view, serves to store the ball in an inactive position in order to allow reloading of the magazine with points of the same size, or to allow rotation of the insert so as to receive points of a different size.The forward leg 11 4 of the frame may include clearance openings 1 68 on either side of the magazine defining structure to permit the user his fingers to remove the cylindrical insert upwardly out of its associated cavity if this be necessary for any reason, as for example for cleaning purposes since stacks of points are commonly held together by a material such as wax.

Figs. 7 and 9 illustrate the configuration of the driver adjacent the lower end of the forward leg 114, and more particularly in the area of the lowermost point in the stack as shown at P3 in Fig. 9. This point is in position to be driven by the driver plate 138, and Fig. 9 shows this plate 1 38 as slidably received between fixed guide plates 1 39, 1 39 which plates are secured to the lower end of the frame leg 114 by screws 115, 115. The plate 1 38 is attached to the underside of the slide block 1 34 by suitable means (such as screws not shown) and a bumper 144 is preferably provided on the forward end of block 1 34 in order to cushion the block and its related assembly at the forward limit of its travel. However, the impact of the plate 1 38 with the point P3 at the lower end of the stack in the magazine is such that the front apex of the triangular point will be driven into a wood sash with a sufficient force to provide a good connection with the sash and at the same time leave a portion of the point exposed for engagement with a glass pane to hold the latter in place. The impact force will vary depending on the size points being used, and therefore the driver described above provides a significant advantage over prior art drivers in that this force can be adjusted over a wide range in a driver capable of handling points of several different size and/or shape.

Claims (5)

1. A tool for use by a glazier to set glass in a frame or sash comprising: a frame having a hollow portion extending from the point driving position of the tool, into which hollow portion an inserted part is located, which part includes one or more points and support means for accommodating and securing differently sized cutting points in the hollow portion of the tool or in a position to be driven by the tool.

2. A tool as claimed in Claim 1, in which the support means includes two recessed portions on the inserted part, into one of which portions a part of the point to be located in the driving position is secured.

3. A tool as claimed in Claim 2, in which the part of the point is secured in one of the recessed portions by means of a block under pressure bearing on the inserted part so that the surface of said recessed portion is forced onto the side of the point and a portion of the point is forced to penetrate a member located opposite to said recessed portion.

4. A tool as claimed in any one of the preceding Claims, in which the hollow portion of the frame includes a magazine for supporting a stack of points, one of which points extends into the driving position of the tool.

5. A tool substantially as herein described with reference to and as illustrated in the accompanying drawings.

5. A tool as claimed in Claim 4, in which the stack of points is urged towards the driving position of the tool by a spring loaded mechanism in the magazine.

6. A tool for use by a glazier to set glass in a frame or sash comprising a frame and a driving plate for driving each of a stack of points in turn, a magazine for storing the stack of points, trigger means for operating the point driving plate, means for biasing a stack of points toward a plate, means for biasing a stack of points toward a position in which the endmost point is in position to engage a workpiece an insert member having a first guide surface for engaging a point of a first size and shape, and a second guide surface for engaging a point of a second and different size and shape to contact a workpiece, means for mounting the insert member in the frame to cooperate with the points in a stack of predetermined size, the insert mounting means providing support for the insert member in a first and a second position alternatively, and the stack biasing means and the driving plate adapted to operate with the insert member in both the alternative positions.

7. A tool as claimed in Claim 6, in which the insert member defines a third guide surface for engaging a stack of points of a third size and shape, the insert member mounted in the frame to cooperate with the magazine when oriented in a third position angularly spaced from the first and second alternative positions.

8. A tool as claimed in Claim 6 or Claim 7, in which the insert member is elongate and is rotatable about its longitudinal axis in the magazine at least when no points are stacked in any of the insert positions.

9. A tool as claimed in any one of Claims 6 to 8, in which the driving plate is provided on a point driving block slidably mounted in the frame; biasing means for the block, the trigger means including mechanism for cocking the block for movement along a path fixed in the frame, an operating lever and a return spring and pivot means defining an axis for movement of the lever, including an angularly adjustable eccentric cam for varying the location in the frame of the lever pivot axis with respect to the path of the block, and catch means for releasably latching the operating lever and driving block during cocking movement, the catch means including at least one spring biased element between the lever and the block to permit independent driving movement of the block and return movement of the operating lever preparatory to a succeeding cocking and driving motion.

10. A tool as claimed in Claim 9, in which the catch means comprises the spring biased element slidably received in an opening provided in the operating lever, the element having a block engaging notch, and a spring in the opening to bias the element toward the block.

11. A tool substantially as herein described with reference to the illustrated ac accompanying drawings.

CLAIMS (21 Aug 1980)

1. A tool for use by a glazier comprising a frame and a driving plate for driving each of a stack of points in turn, a magazine for storing the stack of points, trigger means for operating the point driving plate, means for biasing a stack of points toward a position in which the end most point is in position to be driven by said plate into a workpiece, an elongated insert member for the magazine and having a first guide surface for engaging points of a first size and shape, and a second guide surface for engaging points of a second and different size and shape, means for mounting the insert member in the magazine to cooperate with the points in a stack of predetermined size, the insert mounting means providing support for rotating the insert member between a first and a second position alternatively at least when no points are provided in the magazine, and the stack biasing means and the driving plate adapted to operate with the insert member in both said alternative positions when points of said first size or said second size are provided alternatively in the magazine.

2. A tool as claimed in Claim 1 in which the insert member defines a third guide surface for engaging a stack of points of a third size and shape, the insert member mounted in the frame to cooperate with the magazine when oriented in a third position angularly spaced from the first and second alternative positions.

3. A tool as claimed in either Claim 1 or Claim 2 in which the driving plate is provided on a point driving block slidably mounted in the frame; biasing means for the block, the trigger means including mechanism for cocking the block for movement along a path fixed in the frame, an operating lever and a return spring and pivot means defining an axis for movement of the lever, including an angularly adjustable eccentric cam for varying the location in the frame of the lever pivot axis with respect to the path of the block, and catch means for releasably latching the operating lever and driving block during cocking movement, the catch means including at least one spring biased element between the lever and the block to permit independent driving movement of the block and return movement of the operating lever preparatory to a succeeding cocking and driving motion.

4. A tool as claimed in Claim 3 in which, the catch means comprises the spring biased element slidably received in an opening provided in the operating lever, the element having a block engaging notch, and a spring in the opening to bias the element toward the block.